CN113950002B - Switching method, terminal and base station of broadcast multicast transmission mode - Google Patents

Abstract

The embodiment of the invention provides a switching method, a terminal and a base station of a broadcast multicast transmission mode, wherein the method comprises the following steps: acquiring a target transmission mode of a broadcast multicast service and acquiring configuration information of the target transmission mode; receiving the broadcast multicast service based on the configuration information of the target transmission mode; wherein, the target transmission mode is a PTP mode or a PTM mode; the acquisition mode of the target transmission mode comprises any one of the following: the target transmission mode indicated by the base station in DCI is obtained, the target transmission mode indicated by the base station in a multicast control channel MCCH is obtained, the target transmission mode indicated by the base station through MAC-CE is obtained, and the target transmission mode is obtained through a preset timer. The embodiment of the invention can rapidly indicate the transmission mode of the broadcast multicast service.

Description

A method for switching broadcast and multicast transmission modes, a terminal and a base station

Technical Field

The present invention relates to the field of communication technology, and in particular to a method, a terminal and a base station for switching broadcast and multicast transmission modes.

Background Art

With the increasing popularity of mobile video services, peer-to-peer multicast/broadcast streaming, group communications, and broadcast/multicast Internet of Things (IoT) applications, the global mobile communications industry has reached a consensus that the fifth generation mobile communications (5G) networks need to have the ability to flexibly and dynamically allocate wireless spectrum and network resources between unicast and multicast services, and need to support independent deployment of broadcast/multicast networks.

In the current 5G, base stations send two types of data. One is terminal-oriented data, which can only be received by the target terminal and is called unicast data. The other is data for all terminals or specific groups in the cell, that is, all users in the cell or users in a specific group can receive the service.

In the technical evolution of the New Radio (NR), in order to more effectively perform broadcast and multicast transmission, two transmission modes are supported, namely, point to point (PTP) transmission mode and point to multi-point (PTM) transmission mode. Among them, the PTP mode refers to the transmission of data by the sending node (base station) based on a single terminal, that is, the scheduling signaling and the corresponding scheduling data are carried out for one terminal; the characteristic of this mode is that the base station can adjust the data bit rate according to the channel conditions of the terminal, which is conducive to saving air interface resources when there are fewer users receiving broadcast and multicast services (that is, when there are fewer terminals that need to receive services in the PTP mode). The PTM mode refers to the transmission of data by the sending node based on multiple terminals, that is, the scheduling signaling and the corresponding scheduling data are carried out for a group of terminals; the characteristic of this mode is that data transmission needs to be carried out at a lower data bit rate, which is conducive to saving air interface resources when the number of receiving terminals is large.

When the transmission mode needs to be switched between the PTP mode and the PTM mode, how to effectively and quickly indicate that the transmission mode has changed to avoid wasting air interface resources is an issue that needs to be studied.

Summary of the invention

The embodiment of the present invention provides a method, a terminal and a base station for switching a broadcast multicast transmission mode, so as to quickly indicate the transmission mode of a broadcast multicast service.

An embodiment of the present invention provides a method for switching a broadcast multicast transmission mode, which is applied to a terminal and includes:

Obtaining a target transmission mode of a broadcast multicast service and obtaining configuration information of the target transmission mode;

The broadcast multicast service is received based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode;

The method for acquiring the target transmission mode includes any one of the following: acquiring the target transmission mode indicated by the base station in the downlink control information DCI, acquiring the target transmission mode indicated by the base station in the multicast control channel MCCH, acquiring the target transmission mode indicated by the base station through the media access control-control unit MAC-CE, and acquiring the target transmission mode through a preset timer.

An embodiment of the present invention provides a method for switching a broadcast multicast transmission mode, which is applied to a base station and includes:

Sending a target transmission mode of a broadcast multicast service to a terminal, and sending configuration information of the target transmission mode to the terminal, so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode;

The method of sending the target transmission mode of the broadcast multicast service to the terminal includes any one of the following: sending the target transmission mode to the terminal through the downlink control information DCI, sending the target transmission mode to the terminal through the multicast control channel MCCH, and sending the target transmission mode to the terminal through the media access control-control unit MAC-CE.

An embodiment of the present invention provides a switching device for a broadcast multicast transmission mode, which is applied to a terminal and includes:

An acquisition module, used to acquire a target transmission mode of a broadcast or multicast service and to acquire configuration information of the target transmission mode;

A receiving module, used to receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode;

The method for acquiring the target transmission mode includes any one of the following: acquiring the target transmission mode indicated by the base station in the downlink control information DCI, acquiring the target transmission mode indicated by the base station in the multicast control channel MCCH, acquiring the target transmission mode indicated by the base station through the media access control-control unit MAC-CE, and acquiring the target transmission mode through a preset timer.

An embodiment of the present invention provides a switching device for a broadcast multicast transmission mode, which is applied to a base station, including:

a sending module, configured to send a target transmission mode of a broadcast multicast service to a terminal, and send configuration information of the target transmission mode to the terminal, so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode;

The method of sending the target transmission mode of the broadcast multicast service to the terminal includes any one of the following: sending the target transmission mode to the terminal through the downlink control information DCI, sending the target transmission mode to the terminal through the multicast control channel MCCH, and sending the target transmission mode to the terminal through the media access control-control unit MAC-CE.

An embodiment of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, steps of a method for switching a broadcast multicast transmission mode applied to the terminal are implemented.

An embodiment of the present invention provides a base station, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, steps of a method for switching a broadcast multicast transmission mode applied to the base station are implemented.

An embodiment of the present invention provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for switching the broadcast multicast transmission mode are implemented.

The method, terminal and base station for switching the broadcast multicast transmission mode provided by the embodiment of the present invention acquire the target transmission mode of the broadcast multicast service by adopting DCI, MCCH, MAC-CE or a preset timer, that is, switching the PTM/PTP mode, so that the switching of the transmission mode of the broadcast multicast service is more flexible, and an effective and rapid indication of the change of the transmission mode is achieved, thereby avoiding the waste of air interface resources and effectively saving air interface resources.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

1 is a flowchart of a method for switching a broadcast multicast service transmission mode applied to a terminal according to an embodiment of the present invention;

2 is a schematic diagram of a target transmission mode for indicating multiple broadcast and multicast services through a bitmap in an embodiment of the present invention;

3 is a schematic diagram of one of the target transmission modes of indicating multiple broadcast and multicast services in groups according to an embodiment of the present invention;

4 is a second schematic diagram of a target transmission method for indicating multiple broadcast and multicast services in groups according to an embodiment of the present invention;

5 is a flowchart of a method for switching a broadcast multicast service transmission mode applied to a base station in an embodiment of the present invention;

6 is a block diagram of a switching device for a broadcast multicast service transmission mode applied to a terminal in an embodiment of the present invention;

7 is a block diagram of a switching device for a broadcast multicast service transmission mode applied to a base station in an embodiment of the present invention;

FIG8 is a schematic diagram of the structure of a terminal in an embodiment of the present invention;

FIG. 9 is a schematic diagram of the structure of a base station in an embodiment of the present invention.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

To facilitate the clear description of the technical solutions of the embodiments of the present invention, in each embodiment of the present invention, if the words "first", "second", etc. are used to distinguish the same items or similar items with basically the same functions and effects, those skilled in the art can understand that the words "first", "second", etc. do not limit the quantity and execution order.

In the embodiment of the present invention, the term "and/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character "three" generally indicates that the associated objects are in an "or" relationship.

In the embodiments of the present invention, the term "plurality" refers to two or more than two, and other quantifiers are similar.

In addition, it should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the "in one embodiment" or "in an embodiment" that appear throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

Specifically, in the current 5G system design, the area covered by a base station cell is divided into multiple areas, each of which is divided into a system synchronous block coverage area (SSB). When sending a system broadcast message, each area will send a system broadcast message with the same content. In order to ensure the continuity of coverage, the SSB coverage areas are continuous and have a certain overlap area. For example, a cell is covered by 4 SSBs. Specifically, corresponding to the system broadcast message sent by each SSB coverage area, the data transmission between the SSB coverage areas is time-divided, that is, it is sent at different times. For example, assuming that the cell includes 4 SSB coverage areas, each SSB has 2 candidate times for sending a scheduled system broadcast message, and in a broadcast information monitoring window, there are 8 monitoring opportunities, then each SSB coverage area has 2 monitoring opportunities. At this time, in order to make the base station scheduling flexible, when sending the broadcast information corresponding to each SSB coverage area, it is sufficient to send the scheduling information of the broadcast information to the terminal at one of the monitoring opportunities. It should be noted that the scheduling information sent at the monitoring opportunity is used to instruct the base station to send the physical downlink shared channel (PDSCH) scheduling information corresponding to the broadcast information in the SSB coverage area, including the time domain and frequency domain position of PDSCH, modulation and coding format and redundant version, etc.

Broadcast and multicast services are important multimedia services that 5G needs to support. From the perspective of service type, they include streaming media, such as audio broadcasting and live TV; from the perspective of data type, they include data files for software upgrades; from the perspective of public safety, they include information such as earthquakes, tsunamis, or public health safety. Different services have different latency requirements and data rates. Compared with system broadcast information, they have different service quality requirements and rates. In particular, live TV services require higher service rates and transmission quality requirements. In addition, in terms of transmission methods, the transmission of broadcast and multicast services includes two methods: PTP and PTM. The PTM method refers to the base station establishing a wireless bearer, sending at a single point, and multiple terminals receiving at the same time. This method is suitable for multiple terminals (such as more than 10 terminals) to receive broadcast and multicast service data; the PTP method refers to the base station establishing a wireless bearer for each terminal. This method is suitable for a small number of users to receive broadcast and multicast service data.

In addition, in the NR system, a cell supports multi-beam transmission. When the terminal and the base station send control channel and service channel data, the transmission beam needs to be clear so that the receiving end can receive the data. For example, when the terminal is in the coverage area of SSB1, when the base station sends the physical downlink control channel (PDCCH), its transmission beam is consistent with SSB1 (that is, PDCCH and SSB1 have a quasi co-location (Quasi Co-Location, QCL) relationship, that is, the channel characteristics on the antenna port symbol of the PDCCH can be derived from the antenna port of the SSB1). When the terminal moves from the coverage area of SSB1 to the coverage area of SSB2, when the base station sends PDCCH, its transmission beam needs to be adjusted to the direction of SSB2 (that is, PDCCH and SSB2 have a QCL relationship). This QCL relationship between PDCCH and a certain SSB adopts the Transmission Configuration Indication (TCI) state. When the terminal moves from SSB1 to SSB2, the base station sends TCI state indication information through a Media Access Control-Control Unit (MAC-CE) message.

In addition, when the conversion between PTP and PTM transmission modes occurs, the traditional process of switching indication from PTP to PTM and establishing PTM is as follows: the sending node indicates the transmission mode, namely the PTM mode, in the multicast control channel (MCCH); then the receiving node (terminal) releases the PTP link and indicates the PTM configuration information on the MCCH; then the sending node receives the multicast broadcast service data according to the PTM configuration information. The traditional process of switching indication from PTM to PTP and establishing PTP is as follows: the sending node indicates the transmission mode, namely the PTP mode, in the MCCH; then the receiving node releases the PTM configuration information; then if it is in the idle state, a random process is performed to enter the link state, and a PTP connection is established to establish data transmission.

Specifically, when MCCH is used to indicate the switch between PTP and PTM, a field is used to indicate the transmission mode of a specific broadcast multicast service. For example, when PTP is indicated, it means that a specific broadcast multicast service in this cell adopts the PTP mode; when PTM is indicated, it means that a specific broadcast multicast service in this cell adopts the PTM mode.

However, using only MCCH to indicate PTP/PTM switching has the following disadvantages: First, the switching indication is delayed and cannot quickly respond to the requirement for switching the transmission mode. The main application scenario of PTP/PTM switching is to optimize resource utilization. On the one hand, switching is required when the number of service users and channels receiving broadcast multicast changes, and switching may also be required when the load of base station communication changes. The response time of MCCH depends on the content modification cycle of MCCH configuration. The more commonly used configuration cycle is hundreds of milliseconds or 1-2 seconds, and the delay is relatively large (it should be noted that configuring a shorter MCCH content modification cycle requires the terminal to continuously receive MCCH data, which wastes air interface resources and is not conducive to terminal power saving). Second, switching indications based on cells will cause waste of air interfaces. For example, when multiple terminals meet PTM in the coverage area of SSB1, all SSB coverage areas of the cell use PTM. This operation will cause a waste of resources. In view of this, the present invention provides the following embodiments:

As shown in FIG. 1 , it is a flow chart of the method for switching the transmission mode of broadcast multicast in an embodiment of the present invention. The method comprises the following steps:

Step 101: Acquire a target transmission mode of a broadcast or multicast service, and acquire configuration information of the target transmission mode.

Specifically, the target transmission mode of the broadcast multicast service is the PTP mode or the PTM mode.

In addition, when the terminal obtains the target transmission mode of the broadcast multicast service, the method for obtaining the target transmission mode may include any one of the following:

Obtain the target transmission mode indicated by the base station in the DCI, obtain the target transmission mode indicated by the base station in the MCCH, obtain the target transmission mode indicated by the base station through the MAC-CE, and obtain the target transmission mode through a preset timer.

That is, the target transmission mode of the broadcast multicast service can be indicated through the DCI, MAC-CE, MCCH of the control channel or through a preset timer, thereby avoiding a delay in the transmission mode switching indication, so that the requirement for transmission mode switching of the broadcast multicast service can be responded to quickly.

In addition, specifically, the configuration information of the target transmission mode may include any one of the following: control channel detection timing, PDSCH rate matching information, and partial bandwidth (band width part, BWP) information.

Step 102: Receive broadcast and multicast services based on the configuration information of the target transmission mode.

In this step, specifically, after the configuration information of the target transmission mode is acquired, the broadcast multicast service may be received directly based on the configuration information of the target transmission mode.

For example, if the target transmission mode is PTP, the broadcast multicast service is received based on the configuration information of the PTP mode; if the target transmission mode is PTM, the broadcast multicast service is received based on the configuration information of the PTM mode, thereby ensuring the correct reception process of the broadcast multicast service.

In this way, this embodiment determines the target transmission mode of the broadcast multicast service by using DCI, MCCH, MAC-CE or a preset timer, that is, switching the PTM/PTP mode, so that the switching of the transmission mode of the broadcast multicast service is more flexible and the air interface resources are effectively saved.

Furthermore, each acquisition method of the target transmission method is described below respectively.

First, the method of indicating the target transmission mode through DCI:

Among them, when the terminal obtains the target transmission mode indicated by the base station in the DCI, it can include any of the following methods:

(1) Receive first indication information sent by a base station through dedicated DCI signaling, where the first indication information includes a broadcast multicast service identification number and identification information of a target transmission mode.

It should be noted that dedicated DCI refers to a DCI format used to indicate the transmission mode of broadcast and multicast services. It is distinguished from other existing DCI formats by configuring a special radio network temporary identifier (RNTI), such as the definition mode switch-radio network temporary identifier (ms-RNTI). At this time, the transmitter uses ms-RNTI to scramble the DCI transmitted on the PDCCH channel, and the receiver uses ms-RNTI to detect and descramble the PDCCH. The terminal can obtain the indication information of the target transmission mode and perform PTP/PTM conversion.

In addition, the dedicated DCI format includes a broadcast multicast service identification field and a target transmission mode identification field, wherein the broadcast multicast service identification field is used to identify the broadcast multicast service identification number, and the target transmission mode identification field is used to identify the target transmission mode. For example, 0 can be used to identify the PTM mode and 1 can be used to identify the PTP mode, or 1 can be used to identify the PTM mode and 0 can be used to identify the PTP mode. No specific limitation is made here.

In addition, specifically, when the broadcast multicast service is at least two services configured based on a cell or an SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of the broadcast multicast service.

For example, a broadcast multicast service can be identified by a temporary mobile group identifier (TMGI), and the configuration order can be: TMGI-1, TMGI-2, TMGI-3...TMGI-N. At this time, in the dedicated DCI signaling, each bit in the bitmap corresponds to a target transmission mode of a broadcast multicast service, that is, the bitmap indicates the transmission mode of the corresponding TMGI, and each bit sequence corresponds to the configured broadcast multicast service, as shown in Figure 2. In Figure 2, the target transmission mode of the broadcast multicast services identified as TMGI-1 to TMGI-12 is indicated by a bitmap indication method, where 0 indicates the PTM mode and 1 indicates the PTM mode.

In addition, specifically, when the broadcast multicast service is at least two services configured based on the cell or SSB coverage area, and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission mode of the broadcast multicast service with the same transmission mode.

For example, if a total of M broadcast multicast services that need to be indicated by dedicated DCI signaling are configured, the maximum number of bits carried by the dedicated DCI signaling is N, and M>N, the grouping method used at this time can be:

第L组包含(M-K*(L-1))个业务，其中

表示向上取整。此外，在N比特位图中，

表示分组号，K表示K个业务对应的传输方式。Divide M into L groups, each of L-1 groups contains K services

The Lth group contains (MK*(L-1)) services, among which

Indicates rounding up. In addition, in the N-bit bitmap,

represents the group number, and K represents the transmission mode corresponding to K services.

等式成立的情况下，L取数组{1,2,3…N-1}中最小数值。举例如下：In addition, after the base station configures the values of M and N, the terminal and the base station determine the values of L and K in the following manner:

When the equation holds, L takes the smallest value in the array {1,2,3…N-1}. For example:

For example, when N=16, M<=16, L=1, the number of groups is 1, and the indication mode is a special case of not performing grouping.

For another example, as shown in FIG3 , when N=16, M=25, L=2, the number of groups is 2, and among the 16 bits of the dedicated DCI, 1 bit represents the group number, and the remaining 15 bits use a bitmap to indicate the transmission mode of the corresponding broadcast multicast service; that is, a set of bitmap indication information in FIG3 indicates the transmission mode of a group of broadcast multicast services with a group number of 0.

For another example, as shown in FIG4 , when N=16, M=40, L=3, the number of groups is 3, and among the 16 bits of the dedicated DCI, 2 bits represent the group number, and the remaining 14 bits use a bitmap to indicate the transmission mode of the corresponding broadcast multicast service; that is, a set of bitmap indication information in FIG4 indicates the transmission mode of a group of broadcast multicast services with a group number of 2 (corresponding to 01).

In this way, the target transmission mode of the broadcast and multicast services is indicated by means of a bitmap, thereby reducing the overhead of the dedicated DCI.

(2) receiving second indication information sent by the base station through the broadcast multicast DCI, wherein the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Specifically, when the second indication information is indicated through the DCI of broadcast multicast, when the current transmission mode of the broadcast multicast service is the PTP mode, the second indication information is indicated in the DCI of unicast scheduling; when the current transmission mode of the broadcast multicast service is PTM, the second indication information is indicated in the DCI of multicast scheduling.

In addition, specifically, the manner in which the broadcast multicast DCI includes the second indication information may include:

An indication field is newly added in the broadcast multicast DCI, and the indication field includes the second indication information; or, the meaning of the target original field in the broadcast multicast DCI is redefined as the second indication information.

Specifically, when a new indication field is added to the DCI, the content information of the original DCI needs to be added, and the total size (size, the sum of the number of bits of all information fields) of the relevant DCI increases. For example, adding 1 bit to the DCI indicates the second indication information (such as: 0 means keeping the current mode unchanged, 1 means switching the transmission mode, or vice versa), that is, indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode, and the implementation process of this method is simple.

In addition, specifically, the target original field includes any one of the following: DCI indication format, PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication (such as: using a combination that will not be used in the frequency domain resource indication, such as: all "1"), and time domain resource allocation indication. That is, by modifying the original meaning of any of the above target original fields, the original meaning of the above target original field is redefined as the second indication information, which is beneficial for the terminal to perform channel detection and reduce the requirements for channel detection capabilities.

In this way, the target transmission mode is indicated by means of DCI by any one of the above two methods.

In addition, it should be noted that when the target transmission mode is the PTM mode, the DCI used to indicate the target transmission mode also includes carrier indication information and/or BWP information. In this way, when the carriers sent by the PDSCH and PDCCH used to transmit the broadcast multicast service are on different carriers or BWPs, the terminal can receive the corresponding PDSCH according to the carrier indication information in the DCI.

Second, the method for indicating the target transmission mode through MCCH:

When the terminal obtains the target transmission mode indicated by the base station in the MCCH, the terminal can receive the third indication information periodically sent by the base station through the MCCH.

Specifically, the third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and the index number of the SSB when the broadcast multicast service is sent in units of at least one SSB coverage area.

For example, the third indication information includes the following content:

TMGI=1, indicating that the broadcast multicast service identification number is 1;

Cell ID = 3, indicating that the cell identification number is 3;

SSB index = 0, mode = PTP, indicating that when the index number of the SSB coverage area is 0, the target transmission mode is PTP;

SSB index = 1, mode = PTM, indicating that when the index number of the SSB coverage area is 1, the target transmission mode is PTM;

SSB index = 2, mode = PTM, indicating that when the index number of the SSB coverage area is 2, the target transmission mode is PTM;

SSB index=3, mode=PTP, indicating that when the index number of the SSB coverage area is 3, the target transmission mode is PTP.

The above example defines that the broadcast multicast service identification number is 1 and is sent in cell 3, wherein SSB0 of cell 3 adopts the PTP transmission mode for sending, SSB1 of cell 3 adopts the PTM transmission mode for sending, SSB2 of cell 3 adopts the PTM transmission mode for sending, and SSB3 of cell 3 adopts the PTP transmission mode for sending.

In this way, the target transmission mode is periodically indicated by the MCCH, so that a terminal newly connected to receive a broadcast multicast service can obtain the transmission mode of a specific broadcast multicast service.

Third, the method for indicating the target transmission mode through MAC-CE:

When the terminal obtains the target transmission mode indicated by the base station through MAC-CE, the terminal can receive the fourth indication information sent by the base station through MAC-CE.

Specifically, the fourth indication information includes a control resource set identifier and a transmission configuration indication (TCI) state identifier, wherein the TCI state identifier is associated with the SSB index number.

Specifically, for the method of indicating the target transmission mode through MAC-CE, its main application scenario is that the terminal moves from one SSB coverage area to another SSB coverage area. When the terminal moves from one SSB coverage area (such as SSB-index=1) to another SSB coverage area (such as SSB-index=2), the target transmission mode of the broadcast multicast service can be indicated by the fourth indication information sent by MAC-CE. At this time, the field content of MAC-CE is shown in the following table:

When it is detected that the SSB index associated with the resource set of the control channel for transmitting broadcast multicast data (PTP or PTM control resource set) has changed, the broadcast multicast transmission mode corresponding to the SSB coverage area is periodically indicated based on the MCCH, so that a certain SSB index has a corresponding broadcast multicast transmission mode, so that the terminal can obtain the target transmission mode of the broadcast multicast service of the corresponding SSB through the changed SSB index number. That is, when the broadcast multicast transmission mode of the corresponding SSB before the SSB index conversion is the PTM mode, and the broadcast multicast transmission mode of the corresponding SSB after the SSB index conversion is the PTP mode, it means switching to the PTP mode.

Fourth, for indicating the target transmission mode through a preset timer:

Among them, when the terminal obtains the target transmission mode through a preset timer, when the terminal does not receive the broadcast multicast DCI within the timing duration of the preset timer, the target transmission mode of the broadcast multicast service can be determined as another transmission mode other than the current transmission mode, that is, the transmission mode is switched.

Specifically, when the broadcast multicast service is sent in a certain mode, the terminal detects the corresponding control channel at the detection opportunity of the corresponding mode. If no broadcast multicast control information is received within a certain period of time (it may be that the base station sent a notification but the terminal did not detect it), it is considered that the broadcast multicast transmission mode has changed, and the terminal switches to another transmission mode detection opportunity to detect the corresponding control channel.

The target transmission mode is indicated by a preset timer, so that the transmission mode can be switched even when the terminal cannot receive information.

In this way, the above-mentioned embodiment realizes the indication of the target transmission mode of the broadcast multicast service by means of DCI, MCCH, MAC-CE or preset timer, that is, the switching indication of the transmission mode of the broadcast multicast service is realized, which is equivalent to the existing technology, making the switching of the transmission mode more flexible and effectively saving air interface resources.

It should also be noted that when the terminal is in a connected state, the terminal measures the adjacent SSB and reports the measurement results to the base station, which determines the timing of the terminal's SSB switching, thereby ensuring effective PTP/PTM switching in a specific SSB coverage area. When the terminal is in an idle state, the terminal can only receive broadcast multicast services sent in PTM mode. When the SSB coverage area is changed due to mobility, the terminal selects the SSB coverage area based on the mobility measurement results.

Furthermore, when acquiring the target transmission configuration information, this embodiment can receive the configuration information of the PTP mode and the configuration information of the PTM mode sent by the base station through high-level signaling before acquiring the target transmission mode of the broadcast multicast service; or, after acquiring the target transmission mode of the broadcast multicast service, receive the configuration information of the target transmission mode sent by the base station.

That is, the base station can send the configuration information of PTM and PTP to the terminal in advance through high-level signaling, and the terminal can directly apply the configuration information of PTM or PTP after obtaining the target transmission mode of the broadcast multicast service, without having to obtain it again from the base station, so as to further reduce the delay of the transmission mode conversion. Of course, the base station can also receive the configuration information of the target transmission mode sent by the base station after obtaining the target transmission mode of the broadcast multicast service, so as to avoid receiving invalid transmission mode configuration information.

In addition, specifically, the configuration information includes control channel detection timing corresponding to the transmission mode and/or rate matching information of PDSCH.

In addition, it should be noted that the control channel detection opportunity is configured based on a single broadcast multicast service or a group of broadcast multicast services; the rate matching information of the PDSCH corresponding to the PTM mode is configured based on a group of terminals.

In addition, further, in this embodiment, when the target transmission mode is the PTP mode and the terminal is in an idle state, the terminal can receive the random access channel RACH resources configured by the base station for establishing the PTP; or, when the target transmission mode is the PTP mode and the terminal is in an idle state, the terminal can generate a random number and perform a random access process when the random number is greater than a preset access factor.

It should be noted here that the RACH resource is an additional RACH resource and can be configured through a broadcast or multicast message, so that the terminal can initiate a random access process on the additionally configured RACH resource to avoid the problem of instantaneous network congestion.

This avoids the problem of instant network congestion caused when the transmission mode of the broadcast multicast service is the PTP mode and there are a large number of idle terminals that need to perform a random access process.

In addition, further, in this embodiment, the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas. This makes the indication granularity of the transmission mode at the SSB coverage area level, which is finer than the cell level, further saving air interface resources.

The method for switching the transmission mode of the broadcast multicast service provided in this embodiment determines the target transmission mode of the broadcast multicast service by adopting DCI, MCCH, MAC-CE or a preset timer, that is, switching the PTM/PTP mode, so that the switching of the transmission mode of the broadcast multicast service is more flexible and the air interface resources are effectively saved.

As shown in FIG. 5 , it is a flowchart of a method for switching a broadcast multicast service transmission mode applied to a base station in an embodiment of the present invention. The method comprises the following steps:

Step 501: Send the target transmission mode of the broadcast multicast service to the terminal, and send the configuration information of the target transmission mode to the terminal.

In this step, the base station sends the target transmission mode of the broadcast multicast service to the terminal and sends the configuration information of the target transmission mode to the terminal, so that the terminal can receive the broadcast multicast service based on the configuration information of the target transmission mode.

Specifically, the target transmission mode of the broadcast multicast service is the PTP mode or the PTM mode.

In addition, the method of sending the target transmission mode of the broadcast multicast service to the terminal includes any one of the following: sending the target transmission mode to the terminal through DCI, sending the target transmission mode to the terminal through MCCH, and sending the target transmission mode to the terminal through MAC-CE.

That is, the base station can indicate the target transmission mode of the broadcast multicast service through DCI, MAC-CE or MCCH, thereby avoiding the delay of the transmission mode switching indication, so as to quickly respond to the transmission mode switching requirement of the broadcast multicast service.

In addition, specifically, the configuration information of the target transmission mode may include control channel detection timing and/or PDSCH rate matching information.

In this way, this embodiment uses DCI, MCCH or MAC-CE to indicate the target transmission mode of the broadcast multicast service, that is, switches the PTM/PTP mode, so that the switching of the transmission mode of the broadcast multicast service is more flexible and the air interface resources are effectively saved.

Furthermore, each indication method of the target transmission method is described below respectively.

First, the method of indicating the target transmission mode through DCI:

When the base station sends the target transmission mode to the terminal through the DCI, it may include any of the following modes:

(1) Sending first indication information through dedicated DCI signaling, wherein the first indication information includes a broadcast multicast service identification number and identification information of the target transmission mode.

Specifically, when the broadcast multicast service is at least two services configured based on a cell or an SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of the broadcast multicast service.

In addition, specifically, when the broadcast multicast service is at least two services configured based on the cell or SSB coverage area, and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission mode of the broadcast multicast service with the same transmission mode.

(2) Sending second indication information through the broadcast multicast DCI, where the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Specifically, the broadcast multicast DCI may include: a new indication field is added to the broadcast multicast DCI, and the indication field includes the second indication information; or, the meaning of the target original field in the broadcast multicast DCI is redefined as the second indication information.

In addition, specifically, the target original field includes any one of the following: DCI indication format, PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication, and time domain resource allocation indication.

In addition, it should be noted that when the target transmission mode is the PTM mode, the DCI used to indicate the target transmission mode also includes carrier indication information.

Second, the method for indicating the target transmission mode through MCCH:

When the target transmission mode is sent to the terminal via the MCCH, the third indication information may be periodically sent via the MCCH.

The third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and the index number of the SSB when sending the broadcast multicast service in units of at least one SSB coverage area.

In this way, the target transmission mode is periodically indicated by the MCCH, so that a terminal newly connected to receive a broadcast multicast service can obtain the transmission mode of a specific broadcast multicast service.

Third, the method for indicating the target transmission mode through MAC-CE:

When the base station sends the target transmission mode to the terminal via MAC-CE, the base station may send the fourth indication information via MAC-CE.

The fourth indication information includes a control resource set identifier and a transmission configuration indication TCI state identifier, wherein the TCI state identifier is associated with the SSB index number.

In this way, the above embodiment realizes the indication of the target transmission mode of the broadcast multicast service through DCI, MCCH or MAC-CE, that is, it realizes the switching indication of the transmission mode of the broadcast multicast service, which is equivalent to the existing technology, making the switching of the transmission mode more flexible and effectively saving air interface resources.

It should be noted here that for the specific content of any of the above methods, please refer to the relevant content of the terminal side method embodiment, and no further details will be given here.

Furthermore, in this embodiment, when sending the configuration information of the target transmission mode to the terminal, the configuration information of the PTP mode and the configuration information of the PTM mode can be sent to the terminal through high-level signaling before the target transmission mode of the broadcast multicast service is sent to the terminal; or, after the target transmission mode of the broadcast multicast service is sent to the terminal, the configuration information of the target transmission mode is sent to the terminal; wherein the configuration information includes the control channel detection timing of the corresponding transmission mode and/or the rate matching information of the physical downlink shared channel PDSCH.

In addition, it should be noted that the control channel detection opportunity is configured based on a single broadcast multicast service or a group of broadcast multicast services; the rate matching information of the PDSCH corresponding to the PTM mode is configured based on a group of terminals.

In addition, further, in this embodiment, when the target transmission mode is the PTP mode and the terminal is in an idle state, the base station may also configure the terminal with random access channel RACH resources for establishing the PTP.

In addition, further, in this embodiment, the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas. This makes the indication granularity of the transmission mode at the SSB coverage area level, which is finer than the cell level, further saving air interface resources.

It should be noted here that the specific content of the above embodiment can refer to the relevant content of the method embodiment on the terminal side, which will not be repeated here.

The method for switching the transmission mode of the broadcast multicast service provided in this embodiment uses DCI, MCCH or MAC-CE to indicate the target transmission mode of the broadcast multicast service, so that the switching of the transmission mode of the broadcast multicast service is more flexible and the air interface resources are effectively saved.

The present invention is specifically described below through specific embodiments.

First embodiment:

In this embodiment, the target transmission mode of the broadcast multicast service is indicated by dedicated DCI signaling, which specifically includes the following steps:

Step 1: The base station indicates the target transmission mode of the broadcast multicast service through dedicated DCI signaling.

Specifically, dedicated DCI signaling refers to a DCI format used to indicate the transmission mode of broadcast and multicast services. This format can be distinguished from other existing DCI formats by configuring a special radio network temporary identifier (RNTI), such as defining a mode switching radio network temporary identifier (ms-RNTI). At this time, the transmitter (which can be a base station) uses ms-RNTI to scramble the DCI transmitted on the PDCCH channel, and the receiver (which can be a terminal) uses ms-RNTI to detect and descramble the PDCCH, thereby obtaining PTP/PTM conversion information. Specifically, the content of the dedicated DCI signaling format includes the following:

Broadcast multicast service identification field, which is used to indicate the broadcast multicast service identification number;

The identification field of the target transmission mode is used to identify the target transmission mode. For example, "0" can be used to identify the PTM mode and "1" can be used to identify the PTP mode, or "1" can be used to identify the PTM mode and "0" can be used to identify the PTP mode. This is not specifically limited here.

Furthermore, in order to reduce the overhead of dedicated DCI signaling, a bitmap may be used to indicate the target transmission mode of the broadcast multicast service. The specific indication mode is as follows:

When the broadcast multicast service is at least two services in the cell or a certain SSB coverage area configured by the base station through the broadcast channel (BCCH) or the multicast control channel (MCCH) or RRC signaling, these services can be identified by the temporary mobile group identifier (TMGI), and the configuration order can be: TMGI-1, TMGI-2, TMGI-3...TMGI-N. At this time, in the dedicated DCI signaling, each bit in the bitmap corresponds to the target transmission mode of a broadcast multicast service, that is, the bitmap indicates the transmission mode of the corresponding TMGI, and each bit sequence corresponds to the configured broadcast multicast service, as shown in Figure 2. In Figure 2, 0 represents the PTM mode and 1 represents the PTM mode.

In addition, when the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, a group indication method can be used, that is, at least two sets of bitmap indication information are included in the dedicated DCI signaling, and each set of bitmap indication information is used to indicate the target transmission mode of the broadcast multicast service with the same transmission mode. For example, if a total of M broadcast multicast services that need to be indicated by dedicated DCI signaling are configured, the maximum number of bits carried by the dedicated DCI signaling is N, and M>N, the grouping method used at this time can be:

第L组包含(M-K*(L-1))个业务。此外，在N比特位图中，

表示分组号，K表示K个业务对应的传输方式。Divide M into L groups, each of L-1 groups contains K services

The Lth group contains (MK*(L-1)) services. In addition, in the N-bit bitmap,

represents the group number, and K represents the transmission mode corresponding to K services.

等式成立的情况下，L取数组{1,2,3…N-1}中最小数值。举例如下：In addition, after the base station configures the values of M and N, the terminal and the base station determine the values of L and K in the following manner:

When the equation is true, L takes the smallest value in the array {1,2,3…N-1}. For example:

For example, when N=16, M<=16, L=1, the number of groups is 1, and the indication mode is a special case of not performing grouping.

For another example, as shown in FIG3 , when N=16, M=25, L=2, the number of groups is 2, and among the 16 bits of the dedicated DCI, 1 bit represents the group number, and the remaining 15 bits use a bitmap to indicate the transmission mode of the corresponding broadcast multicast service; that is, a set of bitmap indication information in FIG3 indicates the transmission mode of a group of broadcast multicast services with a group number of 0.

For another example, as shown in FIG4 , when N=16, M=40, L=3, the number of groups is 3, and among the 16 bits of the dedicated DCI, 2 bits represent the group number, and the remaining 14 bits use a bitmap to indicate the transmission mode of the corresponding broadcast multicast service; that is, a set of bitmap indication information in FIG4 indicates the transmission mode of a group of broadcast multicast services with a group number of 2 (corresponding to 01).

In this way, through the above grouping method, when the value of N is determined, the base station and the terminal can adaptively perform grouping to represent the target transmission mode of the broadcast multicast service according to the change of the value of M.

Step 2: The terminal obtains configuration information of the transmission mode of the corresponding broadcast and multicast service.

Specifically, the configuration information includes control channel detection timing corresponding to the transmission mode and/or rate matching information of the PDSCH.

The control channel detection timing refers to the time (time slot or symbol) at which the terminal detects the control channel when receiving broadcast multicast services. The base station configures the detection timing according to the service characteristics, so that the terminal can receive the control channel at a specific time, which has the effect of saving power. It should be noted that the detection timing can be configured based on a single service (such as associated with TMGI) or based on a group of services. Of course, the configuration information can be configured through RRC signaling, broadcast signaling, or multicast signaling.

The rate matching information of PDSCH refers to the deduction of some resource units that cannot be occupied by PDSCH from the frequency domain or time resources scheduled by the base station when sending the PDSCH data scheduled for broadcast or multicast, so as to ensure the flexibility of base station calling. It should be noted that these resources (time information and frequency domain information) that cannot be called and occupied are configured through RRC signaling or broadcast signaling or multicast signaling. In addition, compared with the rate matching information scheduled by PTP, the rate matching information of PTM is configured separately, that is, the configuration takes effect on a group of terminals.

In addition, step 2 can be performed after step 1, that is, the base station sends the configuration information of the target transmission mode according to the target transmission mode of the broadcast multicast service. Of course, this step can also be performed before step 1, that is, the base station configures both the configuration information of the PTP mode and the configuration information of the PTM mode to the terminal, and the terminal selects the configuration information of the target transmission mode according to the target transmission mode.

Step 3: Receive broadcast and multicast services based on the configuration information of the target transmission mode.

Specifically, the terminal may detect the scheduling signaling DCI according to the configuration information of the target transmission mode, and receive the PDSCH data on the current carrier or other carriers according to the DCI indication.

In addition, the terminal adopts different receiving processing for different transmission modes. The specific receiving processing methods are as follows:

When the target transmission mode is PTM mode, the terminal starts to detect the control channel at the detection opportunity configured by PTM mode. When the corresponding scheduling information is detected, DCI is parsed in the format of group scheduling. For example, when the DCI contains a rate matching indication, it is parsed according to the rate matching information configured by PTM mode, and the control channel is stopped at the detection opportunity configured by PTP mode.

When the target transmission mode is PTP, the terminal starts to detect the control channel at the detection time configured by the PTP mode. When the corresponding scheduling information is detected, the DCI is parsed in the format of unicast scheduling. If the DCI contains a rate matching indication, it is parsed according to the rate matching information configured by the PTP mode, and the control channel is stopped at the detection time configured by the PTM mode.

Specifically, in order to increase the flexibility of base station scheduling, when the target transmission mode is PTM mode, the DCI of its group scheduling information contains carrier indication information (that is, the carriers sent by PDSCH and PDCCH are on different carriers). At this time, the terminal receives the corresponding PDSCH according to the configured carrier indication information.

Second embodiment:

In this embodiment, the target transmission mode of the broadcast multicast service is indicated by the DCI signaling of the broadcast multicast scheduling, which specifically includes the following steps:

Step 1: The base station indicates the target transmission mode of the broadcast multicast service through the DCI signaling of the broadcast multicast scheduling.

Specifically, when the DCI of the broadcast multicast supports indicating that the transmission mode of the broadcast multicast service has changed, any of the following methods may be used:

First, an indication field is added to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

In this method, the content information of the original DCI needs to be increased, and the total size of the relevant DCI (size, the sum of the number of bits of all information fields) increases. For example, 1 bit is added to the DCI to indicate that the PTP or PTM mode will be switched. The implementation process of this method is simple.

Secondly, the meaning of the target original field in the broadcast multicast DCI is redefined as the second indication information, and the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

In this case, the content and meaning of the original DCI are modified, and the total size of the DCI remains unchanged. This method is conducive to the terminal to perform channel detection and reduces the requirements for channel detection capabilities.

Specifically, the target original field includes any of the following:

DCI indication format, PUCCH power control parameters, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication.

Specifically, as shown in the following table, the signaling content of broadcast multicast scheduling is shown in the following table:

Specifically, when the switching of the transmission mode is indicated by a specific combination of the "frequency domain resource allocation indication" or "time domain resource allocation indication" fields, when the frequency domain resource allocation indications are all 1, it can indicate the switching of the transmission mode of the broadcast multicast service; when the time domain resource allocation indications are all 0, it indicates the switching of the transmission mode of the broadcast multicast service. Currently, no specific limitation is made here.

In addition, in order to increase the flexibility of base station scheduling, when the target transmission mode is PTM mode, the DCI of its group scheduling information contains carrier indication information (that is, the carriers sent by PDSCH and PDCCH are on different carriers). At this time, the terminal receives the corresponding PDSCH according to the configured carrier indication information. Specifically, the carrier indication information can also be indicated in two ways, one is to add a new information field, and the other is to redefine the meaning of the original field in DCI.

Here, the redefinition of the original field indication carrier indication information of DCI is described as follows:

As described above, the 1-bit DCI format indication (DCI formats) is used to indicate whether it is uplink or downlink scheduling when the DCI is non-broadcast multicast (here, the non-broadcast multicast DCI refers to the existing scheduling signaling format DCI, such as unicast data scheduled with C-RNTI, CS-RNTI, and MCS-RNTI as the scrambling code). When the DCI is broadcast multicast (here, the broadcast multicast DCI is broadcast or multicast data scheduled with "different from the existing unicast RNTI" as the channel scrambling code, such as: G-RNTI), there is only downlink scheduling, so this bit information can be used to indicate the carrier indication information.

In addition, as shown in the above table, the 2-bit PUCCH power control parameter is used to indicate the uplink power parameter when the DCI is non-broadcast multicast. When the DCI is broadcast multicast, due to group scheduling, the power control parameter needs to be performed in other ways (such as based on the downlink path loss of each terminal), and the uplink PUCCH power control parameter can be omitted. At this time, it can be used to indicate the carrier indication information.

Step 2: The terminal obtains configuration information of the target transmission mode.

This step is the same as step 2 of the first embodiment and will not be described again.

In addition, it should be noted that when the transmission mode of broadcast multicast is switched from PTM to PTP, if there are a large number of idle terminals that need to establish connections, that is, a large number of terminals perform random access processes, which will cause instantaneous network congestion. At this time, this embodiment can solve the problem in the following way:

First, configure additional RACH resources, that is, when the target transmission mode is PTP and the terminal is in an idle state, it can receive the RACH resources configured by the base station for establishing PTP. Specifically, some additional RACH access resources are configured through broadcast or multicast messages. When the network instructs to switch to PTP, it also indicates that these RACH resources are effective. Terminals that need to establish connections due to receiving broadcast multicast services, some or all of the terminals initiate random access on the additional configured PRACH resources. In order to reduce resource waste, the base station indicates the validity period of the additional RACH resources, that is, during the validity period, the terminal can use the additional configured RACH resources to initiate random access. The additional RACH resources can be separately configured RACH resources, or they can be RACH resources that are originally configured by the base station but are MASKed (shielded).

Second, set the access factor, that is, when the target transmission mode is PTP and the terminal is in idle state, the terminal generates a random number, and performs a random access process when the random number is greater than the preset access factor, otherwise it waits for a certain period of time before initiating random access.

Step 3: Receive broadcast and multicast services according to the configuration information of the target transmission mode.

Specifically, the terminal detects the scheduling signaling DCI according to the configuration information of the target transmission mode, and receives the PDSCH data on the current carrier or other carriers according to the DCI instruction.

When the DCI parsing result indicates that PTP occurs, the terminal starts detecting the control channel at the detection opportunity configured for the PTP mode, and stops detecting the control channel at the detection opportunity configured for the PTM mode.

Embodiment three:

In this embodiment, the target transmission mode of the broadcast multicast service is indicated by a preset timer.

Specifically, indicating the target transmission mode of the broadcast multicast service based on a preset timer is a supplement to the first embodiment and the second embodiment, and can be used together with the first embodiment and the second embodiment. When the terminal misses the target transmission mode of the broadcast multicast service for some reason (such as poor channel quality, unable to correctly detect relevant information, or because of priority issues, the terminal receives a higher priority service), the target transmission mode is indicated based on the preset timer.

That is, when the broadcast multicast service is sent in a certain mode, the terminal detects the corresponding control channel at the detection opportunity of the corresponding mode. If no broadcast multicast control information is received within the timing duration of the preset timer, it is considered that the broadcast multicast transmission mode has changed (it may be that the base station sent a notification, but the terminal did not detect it), then the terminal switches to another transmission mode detection opportunity to detect the corresponding control channel.

For example, at a certain moment, the base station instructs a specific broadcast multicast service to be sent in PTM mode. The terminal detects the broadcast multicast control channel at the detection opportunity corresponding to the PTM mode, starts a preset timer (e.g., the timer duration is 1 second), and performs the following process:

If the control information of the broadcast multicast is received before the preset timer expires, the timing is restarted, and the terminal continues to detect the control channel of the broadcast multicast at the PTM detection opportunity;

If the preset timer times out (ie, no broadcast multicast control information is received within 1 second), it is determined that the target transmission mode of the broadcast multicast service is the PTP mode, and the terminal receives the broadcast multicast service in the PTP mode.

In this way, the present invention realizes flexible switching of broadcast and multicast transmission modes through the above embodiments.

In addition, as shown in FIG6 , it is a module block diagram of a switching device for a broadcast multicast transmission mode applied to a terminal in an embodiment of the present invention, and the device includes:

An acquisition module 601 is used to acquire a target transmission mode of a broadcast or multicast service and to acquire configuration information of the target transmission mode;

The receiving module 602 is used to receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode;

The method for acquiring the target transmission mode includes any one of the following: acquiring the target transmission mode indicated by the base station in the downlink control information DCI, acquiring the target transmission mode indicated by the base station in the multicast control channel MCCH, acquiring the target transmission mode indicated by the base station through the media access control-control unit MAC-CE, and acquiring the target transmission mode through a preset timer.

Optionally, the acquiring the target transmission mode indicated by the base station in downlink control information DCI includes:

receiving first indication information sent by a base station through dedicated DCI signaling, wherein the first indication information includes a broadcast multicast service identification number and identification information of the target transmission mode; or,

The second indication information sent by the base station through the broadcast multicast DCI is received, wherein the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Optionally, when the broadcast multicast service is at least two services configured based on a cell or a synchronization signal block (SSB) coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service.

Optionally, when the broadcast multicast service is at least two services configured based on the cell or synchronization signal block SSB coverage area, and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission mode of the broadcast multicast service with the same transmission mode.

Optionally, the manner in which the broadcast multicast DCI includes the second indication information includes:

An indication field is newly added in the broadcast multicast DCI, and the indication field includes the second indication information; or,

The meaning of the target original field in the broadcast multicast DCI is redefined as the second indication information.

Optionally, the acquiring the target transmission mode by using a preset timer includes:

When the terminal does not receive the broadcast multicast DCI within the timing duration of the preset timer, the target transmission mode of the broadcast multicast service is determined to be another transmission mode except the current transmission mode.

It should be noted here that the device provided in this embodiment can implement all the method steps that can be implemented by the above-mentioned terminal side method embodiment, and can achieve the same technical effect, which will not be repeated here.

In addition, as shown in FIG. 7 , it is a module block diagram of a switching device for a broadcast multicast transmission mode applied to a base station in an embodiment of the present invention, and the device includes:

The sending module 701 is used to send the target transmission mode of the broadcast multicast service to the terminal, and send the configuration information of the target transmission mode to the terminal, so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode;

The method of sending the target transmission mode of the broadcast multicast service to the terminal includes any one of the following: sending the target transmission mode to the terminal through the downlink control information DCI, sending the target transmission mode to the terminal through the multicast control channel MCCH, and sending the target transmission mode to the terminal through the media access control-control unit MAC-CE.

Optionally, sending the target transmission mode to the terminal through downlink control information DCI includes:

Sending first indication information through dedicated DCI signaling, wherein the first indication information includes a broadcast multicast service identification number and identification information of the target transmission mode; or,

The second indication information is sent through the broadcast multicast DCI, wherein the second indication information is used to instruct the transmission mode of the broadcast multicast service to switch from the current transmission mode to the target transmission mode.

Optionally, when the broadcast multicast service is at least two services configured based on a cell or a synchronization signal block (SSB) coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service.

Optionally, when the broadcast multicast service is at least two services configured based on the cell or synchronization signal block SSB coverage area, and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission mode of the broadcast multicast service with the same transmission mode.

Optionally, the manner in which the broadcast multicast DCI includes the second indication information includes:

An indication field is newly added in the broadcast multicast DCI, and the indication field includes the second indication information; or,

The meaning of the target original field in the broadcast multicast DCI is redefined as the second indication information.

It should be noted here that the device provided in this embodiment can implement all the method steps that can be implemented by the above-mentioned base station side method embodiment, and can achieve the same technical effect, which will not be repeated here.

FIG8 is a schematic diagram of the structure of a terminal provided by an embodiment of the present invention. As shown in FIG8 , the terminal 800 may include: at least one processor 801, a memory 802, at least one network interface 804 and other user interfaces 803. The various components in the mobile terminal 800 are coupled together via a bus system 805. It can be understood that the bus system 805 is used to achieve connection and communication between these components. In addition to the data bus, the bus system 805 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, various buses are marked as bus systems 805 in FIG8 .

The user interface 803 may include a display, a keyboard, or a pointing device, such as a mouse, a trackball, a touch pad, or a touch screen.

It can be understood that the memory 802 in the embodiment of the present invention can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM) and direct RAM bus random access memory (DRRAM). The memory 802 of the systems and methods described in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

In some implementations, the memory 802 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof, such as an operating system and application programs.

The operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., which are used to implement various basic services and process hardware-based tasks. The application includes various application programs, such as a media player (Media Player), a browser (Browser), etc., which are used to implement various application services. The program for implementing the method of the embodiment of the present invention can be included in the application.

In the embodiment of the present invention, by calling the computer program or instruction stored in the memory 802, specifically, the computer program or instruction stored in the application program, the processor 801 is used to:

Acquire a target transmission mode of a broadcast multicast service and acquire configuration information of the target transmission mode; receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; a method for obtaining the target transmission mode includes any one of the following: obtaining the target transmission mode indicated by the base station in the downlink control information DCI, obtaining the target transmission mode indicated by the base station in the multicast control channel MCCH, obtaining the target transmission mode indicated by the base station through the media access control-control unit MAC-CE, and obtaining the target transmission mode through a preset timer.

The method disclosed in the above embodiment of the present invention can be applied to the processor 801, or implemented by the processor 801. The processor 801 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 801. The above processor 801 can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor to execute, or the hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802 and completes the steps of the above method in combination with its hardware.

It is understood that the embodiments described in the present invention can be implemented by hardware, software, firmware, middleware, microcode or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), general processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in the present application or a combination thereof.

For software implementation, the described technology can be implemented by a module (e.g., a process, a function, etc.) that performs the functions described in the embodiments of the present invention. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

Optionally, as another embodiment, the processor 801 is also used to: receive first indication information sent by the base station through dedicated DCI signaling, wherein the first indication information includes a broadcast multicast service identification number and identification information of the target transmission mode; or, receive second indication information sent by the base station through a broadcast multicast DCI, wherein the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Optionally, as another embodiment, when the broadcast multicast service is at least two services configured based on a cell or a synchronization signal block SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service.

Optionally, as another embodiment, when the broadcast multicast service is at least two services configured based on the cell or synchronization signal block SSB coverage area, and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission mode of the broadcast multicast service with the same transmission mode.

Optionally, as another embodiment, the manner in which the broadcast multicast DCI includes the second indication information includes: a new indication field is added to the broadcast multicast DCI, and the indication field contains the second indication information; or, the meaning of the target original field in the broadcast multicast DCI is redefined as the second indication information.

Optionally, as another embodiment, the target original field includes any one of the following: DCI indication format, physical uplink control channel PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication.

Optionally, as another embodiment, when the target transmission mode is a PTM mode, the DCI used to indicate the target transmission mode also includes carrier indication information.

Optionally, as another embodiment, the processor 801 is also used to: receive third indication information periodically sent by the base station through MCCH, wherein the third indication information includes a target transmission mode of the broadcast multicast service, carrier or cell information for sending the broadcast multicast service, and an SSB index number when sending the broadcast multicast service in units of at least one SSB coverage area.

Optionally, as another embodiment, the processor 801 is also used to: receive fourth indication information sent by the base station via MAC-CE, wherein the fourth indication information includes a control resource set identifier and a transmission configuration indication TCI state identifier, wherein the TCI state identifier is associated with the SSB index number.

Optionally, as another embodiment, the processor 801 is further used to: when the terminal does not receive the broadcast multicast DCI within the timing duration of the preset timer, determine the target transmission mode of the broadcast multicast service to be another transmission mode other than the current transmission mode.

Optionally, as another embodiment, the processor 801 is further used to: before obtaining the target transmission mode of the broadcast multicast service, receive the configuration information of the PTP mode and the configuration information of the PTM mode sent by the base station through high-layer signaling; or, after obtaining the target transmission mode of the broadcast multicast service, receive the configuration information of the target transmission mode sent by the base station;

The configuration information includes control channel detection timing corresponding to the transmission mode and/or rate matching information of the physical downlink shared channel PDSCH.

Optionally, as another embodiment, the control channel detection timing is configured based on a single broadcast multicast service or based on a group of broadcast multicast services; and the rate matching information of the PDSCH corresponding to the PTM mode is configured based on a group of terminals.

Optionally, as another embodiment, the processor 801 is also used to: when the target transmission mode is the PTP mode and the terminal is in an idle state, receive the random access channel RACH resources configured by the base station for establishing the PTP; or, when the target transmission mode is the PTP mode and the terminal is in an idle state, the terminal generates a random number, and performs a random access process when the random number is greater than a preset access factor.

Optionally, as another embodiment, the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas.

The terminal provided in the embodiment of the present invention can implement each process implemented by the terminal in the aforementioned embodiment, and to avoid repetition, they are not described again here.

FIG9 is a schematic diagram of the structure of a base station provided by an embodiment of the present invention. As shown in FIG9 , the base station 900 may include at least one processor 901, a memory 902, at least one other user interface 903, and a transceiver 904. The various components in the base station 900 are coupled together through a bus system 905. It can be understood that the bus system 905 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 905 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, various buses are marked as bus systems 905 in FIG9 . The bus system may include any number of interconnected buses and bridges, and the various circuits of one or more processors represented by the processor 901 and the memory represented by the memory 902 are linked together. The bus system can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits together, which are all well known in the art, and therefore, the embodiments of the present invention will not be further described. The bus interface provides an interface. The transceiver 904 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. For different user devices, the user interface 903 may also be an interface capable of externally or internally connecting required devices, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

It can be understood that the memory 902 in the embodiment of the present invention can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM) and direct RAM bus random access memory (DRRAM). The memory 902 of the systems and methods described in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

The processor 901 is responsible for managing the bus system and general processing. The memory 902 may store computer programs or instructions used by the processor 901 when performing operations. Specifically, the processor 901 may be used to: send a target transmission mode of a broadcast multicast service to a terminal, and send configuration information of the target transmission mode to the terminal, so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; the method of sending the target transmission mode of the broadcast multicast service to the terminal includes any one of the following: sending the target transmission mode to the terminal through the downlink control information DCI, sending the target transmission mode to the terminal through the multicast control channel MCCH, and sending the target transmission mode to the terminal through the media access control-control unit MAC-CE.

The method disclosed in the above embodiment of the present invention can be applied to the processor 901, or implemented by the processor 901. The processor 901 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the processor 901 or the instruction in the form of software. The above processor 901 can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor to execute, or the hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 902, and the processor 901 reads the information in the memory 902 and completes the steps of the above method in combination with its hardware.

It is understood that the embodiments described in the present invention can be implemented by hardware, software, firmware, middleware, microcode or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), general processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in the present application or a combination thereof.

For software implementation, the described technology can be implemented by a module (e.g., a process, a function, etc.) that performs the functions described in the embodiments of the present invention. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

Optionally, as another embodiment, the processor 901 is also used to: send a first indication information via dedicated DCI signaling, wherein the first indication information includes a broadcast multicast service identification number and identification information of the target transmission mode; or, send a second indication information via a broadcast multicast DCI, wherein the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Optionally, as another embodiment, when the broadcast multicast service is at least two services configured based on a cell or a synchronization signal block SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service.

Optionally, as another embodiment, when the broadcast multicast service is at least two services configured based on the cell or synchronization signal block SSB coverage area, and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission mode of the broadcast multicast service with the same transmission mode.

Optionally, as another embodiment, the manner in which the broadcast multicast DCI includes the second indication information includes: a new indication field is added to the broadcast multicast DCI, and the indication field contains the second indication information; or, the meaning of the target original field in the broadcast multicast DCI is redefined as the second indication information.

Optionally, as another embodiment, the target original field includes any one of the following: DCI indication format, physical uplink control channel PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication.

Optionally, as another embodiment, when the target transmission mode is a PTM mode, the DCI used to indicate the target transmission mode also includes carrier indication information.

Optionally, as another embodiment, the processor 901 is also used to: periodically send a third indication information through MCCH, wherein the third indication information includes a target transmission mode of the broadcast multicast service, carrier or cell information for sending the broadcast multicast service, and an SSB index number when sending the broadcast multicast service in units of at least one SSB coverage area.

Optionally, as another embodiment, the processor 901 is also used to: send a fourth indication information through MAC-CE, wherein the fourth indication information includes a control resource set identifier and a transmission configuration indication TCI state identifier, wherein the TCI state identifier is associated with the SSB index number.

Optionally, as another embodiment, the processor 901 is further configured to: before sending the target transmission mode of the broadcast multicast service to the terminal, send the configuration information of the PTP mode and the configuration information of the PTM mode to the terminal through high-layer signaling; or, after sending the target transmission mode of the broadcast multicast service to the terminal, send the configuration information of the target transmission mode to the terminal;

The configuration information includes control channel detection timing corresponding to the transmission mode and/or rate matching information of the physical downlink shared channel PDSCH.

Optionally, as another embodiment, the control channel detection timing is configured based on a single broadcast multicast service or based on a group of broadcast multicast services; and the rate matching information of the PDSCH corresponding to the PTM mode is configured based on a group of terminals.

Optionally, as another embodiment, the processor 901 is further used to: when the target transmission mode is the PTP mode and the terminal is in an idle state, configure the terminal to use a random access channel RACH resource to establish the PTP.

Optionally, as another embodiment, the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas.

The base station provided in the embodiment of the present invention can implement each process implemented by the base station in the aforementioned embodiment, and to avoid repetition, they are not described again here.

The above mainly introduces the solution provided by the embodiment of the present invention from the perspective of electronic equipment. It can be understood that in order to realize the above functions, the electronic equipment provided by the embodiment of the present invention includes a hardware structure and/or software module corresponding to each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiment disclosed in the present invention, the present invention can be implemented in the form of hardware or a combination of hardware and computer software.

Whether a function is performed in hardware or in a computer software-driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

The embodiment of the present invention can divide the functional modules of the electronic device etc. according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional module.

It should be noted that the division of modules in the embodiment of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the above-described system, device and unit can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of a software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the method described in each embodiment of the present invention. The computer storage medium is a non-transitory medium, including: flash memory, mobile hard disk, read-only memory, random access memory, disk or optical disk, etc., which can store program code.

On the other hand, an embodiment of the present invention further provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments.

On the other hand, an embodiment of the present invention further provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements the method steps provided in the above embodiments and can achieve the same technical effect, which will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (31)

1. A switching method of a broadcast multicast transmission mode, applied to a terminal, characterized in that, comprising: Obtain the target transmission mode of the broadcast multicast service, and obtain configuration information of the target transmission mode; Receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein, The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; The acquisition method of the target transmission mode includes any of the following: acquisition of the target transmission mode indicated by the base station in the downlink control information DCI, acquisition of the target transmission mode indicated by the base station in the multicast control channel MCCH, Obtaining the target transmission mode indicated by the base station through a medium access control-control unit MAC-CE, and acquiring the target transmission mode through a preset timer; The acquisition of the target transmission mode indicated by the base station in the downlink control information DCI includes: Receiving the first indication information sent by the base station through dedicated DCI signaling, where the first indication information includes the broadcast multicast service identification number and the identification information of the target transmission mode; or, Receiving second indication information sent by the base station through DCI of broadcast multicast, wherein the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode; The acquisition of the target transmission mode indicated by the base station in the multicast control channel MCCH includes: receiving the third indication information periodically sent by the base station through the MCCH, wherein the third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and at least The index number of the SSB when the broadcast and multicast service is sent in units of a synchronization signal block SSB coverage area; The acquisition of the target transmission mode indicated by the base station through a medium access control-control unit MAC-CE includes: Receiving fourth indication information sent by the base station through the MAC-CE, wherein the fourth indication information includes a control resource set identification number and a transmission configuration indication TCI state identification number, wherein the TCI state identification number is associated with the SSB index number; The acquisition of the target transmission mode through a preset timer includes: When the terminal does not receive the broadcast-multicast DCI within the preset timer duration, the terminal determines the target transmission mode of the broadcast-multicast service as another transmission mode except the current transmission mode. 2. The switching method of the broadcast and multicast transmission mode according to claim 1, wherein when the broadcast and multicast service is at least two services configured based on a cell or a synchronization signal block (SSB) coverage area, the The first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service. 3. The switching method of the broadcast and multicast transmission mode according to claim 1, wherein when the broadcast and multicast service is at least two services configured based on a cell or a synchronization signal block (SSB) coverage area, and the When the number of bits carried by the dedicated DCI signaling is less than the configured total number of broadcast and multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the same transmission mode Target transmission mode of the broadcast multicast service. 4. The switching method of broadcast multicast transmission mode according to claim 1, characterized in that, the manner in which the DCI of the broadcast multicast includes the second indication information comprises: An indication field is newly added to the DCI of the broadcast multicast, and the indication field includes the second indication information; or, The meaning of the original target field in the broadcast-multicast DCI is redefined as the second indication information. 5. The switching method of broadcast multicast transmission mode according to claim 4, is characterized in that, the original field of described target comprises any one of following: DCI indication format, physical uplink control channel PUCCH power control parameters, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication. 6. The switching method of broadcast multicast transmission mode according to claim 1, characterized in that, when the target transmission mode is a PTM mode, the DCI for indicating the target transmission mode also includes carrier indication information . 7. The switching method of the broadcast and multicast transmission mode according to claim 1, wherein said obtaining the configuration information of the target transmission mode comprises: Before obtaining the target transmission mode of the broadcast multicast service, receiving the configuration information of the PTP mode and the configuration information of the PTM mode sent by the base station through high-layer signaling; or, After obtaining the target transmission mode of the broadcast multicast service, receiving the configuration information of the target transmission mode sent by the base station; Wherein, the configuration information includes the control channel detection timing of the corresponding transmission mode and/or the rate matching information of the physical downlink shared channel PDSCH. 8. The switching method of broadcast multicast transmission mode according to claim 7, is characterized in that, The control channel detection timing is configured based on a single broadcast multicast service or based on a group of broadcast multicast services; The rate matching information of the PDSCH corresponding to the PTM mode is configured based on a group of terminals. 9. The switching method of broadcast multicast transmission mode according to claim 1, is characterized in that, also comprises: When the target transmission mode is the PTP mode and the terminal is in an idle state, receiving a random access channel RACH resource configured by the base station for establishing PTP; or, When the target transmission mode is the PTP mode and the terminal is in an idle state, the terminal generates a random number, and performs a random access process when the random number is greater than a preset access factor. 10. The switching method of the broadcast multicast transmission mode according to any one of claims 1 to 9, characterized in that, the target transmission mode of the broadcast multicast service takes a single SSB coverage area or a group of SSB coverage areas as a unit to configure. 11. A method for switching broadcast and multicast transmission modes, applied to a base station, characterized in that it comprises: sending the target transmission mode of the broadcast multicast service to the terminal, and sending the configuration information of the target transmission mode to the terminal, so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode ;in, The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; The method of sending the target transmission mode of the broadcast multicast service to the terminal includes any of the following: sending the target transmission mode to the terminal through the downlink control information DCI, sending the target transmission mode to the terminal through the multicast control channel MCCH The terminal sends the target transmission mode to the terminal through a media access control-control unit MAC-CE; The sending the target transmission mode to the terminal through the downlink control information DCI includes: Sending the first indication information through dedicated DCI signaling, where the first indication information includes the broadcast multicast service identification number and the identification information of the target transmission mode; or, Sending second indication information through broadcast multicast DCI, where the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode; The sending the target transmission mode to the terminal through the multicast control channel MCCH includes: The third indication information sent periodically through the MCCH, wherein the third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and at least one SSB The index number of the SSB when broadcast and multicast services are sent in units of coverage areas; The sending the target transmission mode to the terminal through the medium access control-control unit MAC-CE includes: Sending fourth indication information through the MAC-CE, wherein the fourth indication information includes a control resource set identification number and a transmission configuration indication TCI state identification number, wherein the TCI state identification number is associated with an SSB index number. 12. The switching method of broadcast multicast transmission mode according to claim 11, characterized in that, when the broadcast multicast service is at least two services configured based on the cell or synchronization signal block SSB coverage area, the The first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service. 13. The switching method of broadcast multicast transmission mode according to claim 11, characterized in that, when the broadcast multicast service is at least two services configured based on the coverage area of a cell or a synchronization signal block (SSB), and the When the number of bits carried by the dedicated DCI signaling is less than the configured total number of broadcast and multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the same transmission mode Target transmission mode of the broadcast multicast service. 14. The method for switching broadcast and multicast transmission modes according to claim 11, wherein the manner in which the DCI of the broadcast and multicast includes the second indication information includes: An indication field is newly added to the DCI of the broadcast multicast, and the indication field includes the second indication information; or, The meaning of the original target field in the broadcast-multicast DCI is redefined as the second indication information. 15. The switching method of the broadcast multicast transmission mode according to claim 14, characterized in that, the original field of the target comprises any one of the following: DCI indication format, physical uplink control channel PUCCH power control parameters, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication. 16. The switching method of broadcast multicast transmission mode according to claim 11, characterized in that, when the target transmission mode is PTM mode, the DCI used to indicate the target transmission mode also includes carrier indication information . 17. The method for switching broadcast and multicast transmission modes according to claim 11, wherein the sending the configuration information of the target transmission mode to the terminal comprises: Before sending the target transmission mode of the broadcast multicast service to the terminal, sending the configuration information of the PTP mode and the configuration information of the PTM mode to the terminal through high-level signaling; or, After sending the target transmission mode of the broadcast multicast service to the terminal, sending the configuration information of the target transmission mode to the terminal; Wherein, the configuration information includes the control channel detection timing of the corresponding transmission mode and/or the rate matching information of the physical downlink shared channel PDSCH. 18. The switching method of the broadcast multicast transmission mode according to claim 17, characterized in that, The control channel detection timing is configured based on a single broadcast multicast service or based on a group of broadcast multicast services; The rate matching information of the PDSCH corresponding to the PTM mode is configured based on a group of terminals. 19. The method for switching broadcast and multicast transmission modes according to claim 11, further comprising: When the target transmission mode is the PTP mode and the terminal is in an idle state, configure a random access channel RACH resource for the terminal to establish PTP. 20. The switching method of broadcast multicast transmission mode according to any one of claims 11 to 19, characterized in that, the target transmission mode of the broadcast multicast service takes a single SSB coverage area or a group of SSB coverage areas as a unit to configure. 21. A switching device for a broadcast and multicast transmission mode, applied to a terminal, characterized in that it comprises: An acquisition module, configured to acquire a target transmission mode of a broadcast multicast service, and acquire configuration information of the target transmission mode; A receiving module, configured to receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein, The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; The acquisition method of the target transmission mode includes any of the following: acquisition of the target transmission mode indicated by the base station in the downlink control information DCI, acquisition of the target transmission mode indicated by the base station in the multicast control channel MCCH, Obtaining the target transmission mode indicated by the base station through a medium access control-control unit MAC-CE, and acquiring the target transmission mode through a preset timer; The acquisition of the target transmission mode indicated by the base station in the downlink control information DCI includes: Receiving the first indication information sent by the base station through dedicated DCI signaling, where the first indication information includes the broadcast multicast service identification number and the identification information of the target transmission mode; or, Receiving second indication information sent by the base station through DCI of broadcast multicast, wherein the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode; The acquisition of the target transmission mode indicated by the base station in the multicast control channel MCCH includes: receiving the third indication information periodically sent by the base station through the MCCH, wherein the third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and at least The index number of the SSB when the broadcast and multicast service is sent in units of a synchronization signal block SSB coverage area; The acquisition of the target transmission mode indicated by the base station through a medium access control-control unit MAC-CE includes: Receiving fourth indication information sent by the base station through the MAC-CE, wherein the fourth indication information includes a control resource set identification number and a transmission configuration indication TCI state identification number, wherein the TCI state identification number is associated with the SSB index number; The acquisition of the target transmission mode through a preset timer includes: When the terminal does not receive the broadcast-multicast DCI within the preset timer duration, the terminal determines the target transmission mode of the broadcast-multicast service as another transmission mode except the current transmission mode. 22. A switching device for a broadcast and multicast transmission mode, applied to a base station, characterized in that it comprises: A sending module, configured to send the target transmission mode of the broadcast multicast service to the terminal, and send the configuration information of the target transmission mode to the terminal, so that the terminal receives the target transmission mode based on the configuration information of the target transmission mode. The above-mentioned broadcast and multicast services; among them, The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; The method of sending the target transmission mode of the broadcast multicast service to the terminal includes any of the following: sending the target transmission mode to the terminal through the downlink control information DCI, sending the target transmission mode to the terminal through the multicast control channel MCCH The terminal sends the target transmission mode to the terminal through a media access control-control unit MAC-CE; The sending the target transmission mode to the terminal through the downlink control information DCI includes: Sending the first indication information through dedicated DCI signaling, where the first indication information includes the broadcast multicast service identification number and the identification information of the target transmission mode; or, Sending second indication information through broadcast multicast DCI, where the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode; The sending the target transmission mode to the terminal through the multicast control channel MCCH includes: The third indication information sent periodically through the MCCH, wherein the third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and at least one SSB The index number of the SSB when broadcast and multicast services are sent in units of coverage areas; The sending the target transmission mode to the terminal through the medium access control-control unit MAC-CE includes: Sending fourth indication information through the MAC-CE, wherein the fourth indication information includes a control resource set identification number and a transmission configuration indication TCI state identification number, wherein the TCI state identification number is associated with an SSB index number. 23. A terminal, comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, wherein the processor implements the following steps when executing the computer program: Obtain the target transmission mode of the broadcast multicast service, and obtain configuration information of the target transmission mode; Receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein, The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; The acquisition method of the target transmission mode includes any of the following: acquisition of the target transmission mode indicated by the base station in the downlink control information DCI, acquisition of the target transmission mode indicated by the base station in the multicast control channel MCCH, Obtaining the target transmission mode indicated by the base station through a medium access control-control unit MAC-CE, and acquiring the target transmission mode through a preset timer; The acquisition of the target transmission mode indicated by the base station in the downlink control information DCI includes: Receiving the first indication information sent by the base station through dedicated DCI signaling, where the first indication information includes the broadcast multicast service identification number and the identification information of the target transmission mode; or, Receiving second indication information sent by the base station through DCI of broadcast multicast, wherein the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode; The acquisition of the target transmission mode indicated by the base station in the multicast control channel MCCH includes: receiving the third indication information periodically sent by the base station through the MCCH, wherein the third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and at least The index number of the SSB when the broadcast and multicast service is sent in units of a synchronization signal block SSB coverage area; The acquisition of the target transmission mode indicated by the base station through a medium access control-control unit MAC-CE includes: Receiving fourth indication information sent by the base station through the MAC-CE, wherein the fourth indication information includes a control resource set identification number and a transmission configuration indication TCI state identification number, wherein the TCI state identification number is associated with the SSB index number; The acquisition of the target transmission mode through a preset timer includes: When the terminal does not receive the broadcast-multicast DCI within the preset timer duration, the terminal determines the target transmission mode of the broadcast-multicast service as another transmission mode except the current transmission mode. 24. The terminal according to claim 23, wherein when the broadcast multicast service is at least two services configured based on the coverage area of a cell or a synchronization signal block (SSB), the first indication information is a bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service. 25. The terminal according to claim 23, wherein when the broadcast multicast service is at least two services configured based on the coverage area of a cell or a synchronization signal block (SSB), and the bits carried by the dedicated DCI signaling When the number is less than the configured total number of broadcast and multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission of broadcast and multicast services in the same transmission mode Way. 26. The terminal according to claim 23, wherein the manner in which the broadcast-multicast DCI includes the second indication information includes: An indication field is newly added to the DCI of the broadcast multicast, and the indication field includes the second indication information; or, The meaning of the original target field in the broadcast-multicast DCI is redefined as the second indication information. 27. A base station, comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, wherein the processor implements the following steps when executing the computer program: sending the target transmission mode of the broadcast multicast service to the terminal, and sending the configuration information of the target transmission mode to the terminal, so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode ;in, The target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; The method of sending the target transmission mode of the broadcast multicast service to the terminal includes any of the following: sending the target transmission mode to the terminal through the downlink control information DCI, sending the target transmission mode to the terminal through the multicast control channel MCCH The terminal sends the target transmission mode to the terminal through a media access control-control unit MAC-CE; The sending the target transmission mode to the terminal through the downlink control information DCI includes: Sending the first indication information through dedicated DCI signaling, where the first indication information includes the broadcast multicast service identification number and the identification information of the target transmission mode; or, Sending second indication information through broadcast multicast DCI, where the second indication information is used to indicate that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode; The sending the target transmission mode to the terminal through the multicast control channel MCCH includes: The third indication information sent periodically through the MCCH, wherein the third indication information includes the target transmission mode of the broadcast multicast service, the carrier or cell information for sending the broadcast multicast service, and at least one SSB The index number of the SSB when broadcast and multicast services are sent in units of coverage areas; The sending the target transmission mode to the terminal through the medium access control-control unit MAC-CE includes: Sending fourth indication information through the MAC-CE, wherein the fourth indication information includes a control resource set identification number and a transmission configuration indication TCI state identification number, wherein the TCI state identification number is associated with an SSB index number. 28. The base station according to claim 27, wherein when the broadcast multicast service is at least two services configured based on the coverage area of a cell or a synchronization signal block (SSB), the first indication information is a bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service. 29. The base station according to claim 27, wherein when the broadcast multicast service is at least two services configured based on the coverage area of a cell or a synchronization signal block (SSB), and the bits carried by the dedicated DCI signaling When the number is less than the configured total number of broadcast and multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate the target transmission of broadcast and multicast services in the same transmission mode Way. 30. The base station according to claim 27, wherein the manner in which the broadcast-multicast DCI includes the second indication information comprises: An indication field is newly added to the DCI of the broadcast multicast, and the indication field includes the second indication information; or, The meaning of the original target field in the broadcast-multicast DCI is redefined as the second indication information. 31. A non-transitory computer-readable storage medium, on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the broadcast and multicast transmission method according to any one of claims 1 to 10 is realized Steps in the method for switching between broadcast and multicast transmission modes according to any one of claims 11 to 20.

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