CN107920334B

CN107920334B - Method and device for improving MBMS service continuity in LTE system

Info

Publication number: CN107920334B
Application number: CN201610885497.9A
Authority: CN
Inventors: 魏立梅; 袁乃华; 范晨
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2016-10-10
Filing date: 2016-10-10
Publication date: 2021-05-18
Anticipated expiration: 2036-10-10
Also published as: CN107920334A

Abstract

The embodiment of the invention provides a method and a device for improving MBMS service continuity in an LTE system. The method comprises the following steps: a multi-cell/multicast coordination entity MCE receives a request for establishing a multimedia broadcast multicast service MBMS service sent by a group communication service application server GCS AS; determining a sending mode of the MBMS according to the request; the MCE distributes a unified group radio network temporary identifier G-RNTI to the MBMS; and the MCE sends the request carrying the SC-PTM mode and the G-RNTI for establishing the MBMS to an eNodeB. The embodiment of the invention can receive the MBMS service without waiting for obtaining the specific configuration of the MBMS service by blindly detecting the PDCCH scrambled by the G-RNTI by the UE, thereby greatly reducing the time delay of service recovery. And the system performance is improved. Meanwhile, the sending method does not need the UE to enter a connected state.

Description

Method and device for improving MBMS service continuity in LTE system

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for improving MBMS service continuity in an LTE system.

Background

An Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, EUTRAN for short) Evolved in 3rd Generation Partnership Project (3 GPP) R13 introduces Single Cell Point To Multipoint (SC-PTM) characteristics: and sending Multimedia Broadcast Multicast Service (MBMS) in an SC-PTM mode. Specifically, the SC-PTM adds a Single-cell Multimedia Broadcast Multicast Service Control Channel (SC-MCCH for short) and a System Information Block 20 (SIB 20 for short). The SC-MCCH is used for carrying SC-PTM configuration information. The information includes configuration information of each MBMS service provided in the current cell. SIB20 carries SC-MCCH configuration information. The information includes: SC-MCCH modification period, repetition period, radio frame offset, etc.

The establishment process of an MBMS service is specifically as follows:

a Group Communication Service Application Server (GCS AS) sends a request for establishing an MBMS Service to a Multi-cell/Multicast Coordination Entity (MCE) through a relevant network element. The request carries the area information or cell information for establishing the MBMS service.

When the MCE receives a request for establishing an MBMS service, the MCE determines the transmission mode of the MBMS service: an MBMS Single Frequency Network (MBSFN) mode or an SC-PTM mode. When the MCE decides to send the MBMS service in an SC-PTM mode, the MCE determines the corresponding eNodeB according to the area information or the cell information in the request. And the MCE sends a request for sending the MBMS service in an SC-PTM mode to a corresponding eNodeB.

When receiving the request of the MCE, the eNodeB allocates a Group Radio Network Temporary Identity (G-RNTI) and time domain resources to the MBMS service. And taking the distributed G-RNTI and time domain resources and a surrounding cell list for broadcasting the MBMS as configuration information of the MBMS and broadcasting the configuration information in the cell through an SC-MCCH. When sending the data of the service, the eNodeB allocates a frequency domain resource and a Modulation and Coding Scheme (MCS for short) to the service through dynamic scheduling, sends the scheduling information of the MBMS service through a Physical Downlink Control Channel (PDCCH) scrambled by a G-RNTI in a cell, and sends the data of the MBMS service through a Physical Downlink Shared Channel (PDSCH) scrambled by the G-RNTI.

User Equipment (User Equipment, UE for short) obtains the configuration information of the SC-MCCH by receiving SIB20, and obtains the configuration information of each MBMS service in a cell by receiving the SC-MCCH according to the configuration information. Then, selecting the MBMS needing to be received, monitoring the PDCCH scrambled by the G-RNTI in a plurality of subframes indicated by the time domain resource information of the MBMS in the configuration information of the MBMS, when the PDCCH scrambled by the G-RNTI is detected in one subframe, the UE obtains the scheduling information of the MBMS from the PDCCH, and then receiving the PDSCH scrambled by the G-RNTI in the same subframe according to the scheduling information to obtain the data of the MBMS.

When an idle-state UE receiving the MBMS moves from a source cell to a target cell, if the target cell provides the MBMS which the UE is receiving, the UE reselects from the source cell to enter the target cell through the cell. And the UE stops receiving the MBMS in the source cell in the cell reselection process and starts to continue receiving the MBMS in the target cell after residing in the target cell. The specific process of resuming receiving the MBMS service in the target cell is as follows:

1) receiving a Physical Broadcast Channel (PBCH) and a System Information Block 1 (SIB 1, for short) in a target cell;

2) receiving other System Information blocks (System Information Block, abbreviated as SIB) including SIB20 according to scheduling Information of System Information (System Information, abbreviated as SI) in SIB1, and after receiving all other SIBs, the UE camping on the target cell;

3) receiving SC-MCCH according to SC-MCCH configuration information on SIB 20;

4) and acquiring the configuration information of the MBMS received in the source cell from the SC-MCCH, and recovering to receive the MBMS in the target cell according to the configuration information.

According to the above process, after the idle UE interrupts receiving the MBMS service in the source cell during the cell reselection, a large delay is required to be experienced when the target cell resumes receiving the MBMS service.

When the UE receives the MBMS in the connected state, if the UE is switched to the target cell in the moving process of the source cell and the target cell provides the MBMS which the UE is receiving, the UE also stops receiving the MBMS in the source cell in the switching process, and starts receiving the MBMS in the target cell after being switched to the target cell. The process of UE resuming receiving MBMS service in target cell is the same as the process of resuming receiving MBMS service after cell reselection. Therefore, in the handover, the problem of large delay exists in the recovery of the MBMS service.

The above problems exist not only in the SC-PTM characteristics in EUTRAN, but also in some other private networks based on Long Term Evolution (LTE). Such as: broadband multimedia digital Trunking (wireless networking solution, WITEN) system. WITEN is a private network that employs LTE technology. In WITEN, when a UE receiving an MBMS service in an idle state moves to a cell edge, the UE needs to enter a Radio Resource Control (RRC) connection state and then is switched to a target cell, where a switching signaling carries configuration information of the MBMS service in the target cell. And after the target cell is switched, the MBMS service is recovered and received according to the configuration information of the MBMS service of the target cell carried in the switching signaling. Although the configuration information of the target cell MBMS service is obtained by switching, the time delay for resuming receiving the MBMS service is smaller. However, entering the RRC connected state consumes the air interface resources of the source cell and the target cell, and the delay for recovering the received service can still be further reduced.

Disclosure of Invention

The embodiment of the invention provides a method and a device for improving MBMS service continuity in an LTE system, which are used for reducing the time delay existing when UE recovers to receive MBMS service.

One aspect of the embodiments of the present invention is to provide a method for improving MBMS service continuity in an LTE system, including:

a multi-cell/multicast coordination entity MCE receives a request for establishing a multimedia broadcast multicast service MBMS service sent by a group communication service application server GCS AS, wherein the request comprises area information or cell information;

the MCE determines a sending mode of the MBMS according to the request;

if the sending mode of the MBMS is a single-cell point-to-multipoint SC-PTM mode, the MCE allocates a unified group radio network temporary identifier G-RNTI to the MBMS;

and the MCE sends a request for establishing the MBMS carrying the SC-PTM mode and the G-RNTI to an eNodeB so that the eNodeB uses the G-RNTI uniformly distributed by the MCE when a cell corresponding to the eNodeB sends the MBMS in the SC-PTM mode, and the eNodeB is the eNodeB corresponding to the area information or the cell information.

Another aspect of the embodiments of the present invention provides a method for improving MBMS service continuity in an LTE system, including:

an eNodeB receives a request which is sent by an MCE and carries an SC-PTM mode and a G-RNTI for establishing an MBMS service;

the eNodeB takes the G-RNTI allocated by the MCE as the G-RNTI of the MBMS and allocates wireless resources for the MBMS;

and the eNodeB takes the G-RNTI of the MBMS, the distributed wireless resources and a cell list which is used for broadcasting the MBMS at the periphery as configuration information of the MBMS and broadcasts the configuration information to User Equipment (UE) in a cell through a single-cell multimedia broadcast multicast service control channel (SC-MCCH), wherein the configuration information comprises mark information which is used for marking whether the G-RNTI is the G-RNTI uniformly distributed by the MCE.

user Equipment (UE) obtains configuration information of a single-cell multimedia broadcast multicast service control channel (SC-MCCH) by receiving a system information block (20 SIB 20);

the UE receives the SC-MCCH according to the configuration information of the SC-MCCH and acquires the configuration information of each MBMS provided by the current cell;

the UE selects an MBMS service from each MBMS service provided by a current cell, and receives the MBMS service according to the configuration information of the MBMS service, wherein the configuration information of the MBMS service comprises: the system comprises a G-RNTI of the MBMS, occupied wireless resources, a cell list for broadcasting the MBMS around and mark information, wherein the mark information is used for marking whether the G-RNTI is uniformly distributed by MCE;

when the UE performs cell reselection or handover in a current cell, if configuration information of the MBMS obtained from an SC-MCCH of the current cell includes flag information, and the flag information indicates that the MBMS uses a unified G-RNTI, the UE receives the MBMS in a target cell through a PDCCH scrambled by the G-RNTI in a blind detection mode;

when the UE receives SIB20 in a target cell, the UE starts to receive SC-MCCH according to SC-MCCH configuration information;

after the UE obtains the configuration information of each MBMS on the SC-MCCH by receiving the SC-MCCH, extracting the configuration information of the MBMS currently being received by blind detection from the SC-MCCH;

and the UE stops the blind detection of the PDCCH scrambled by the G-RNTI in a target cell and receives the MBMS according to the extracted configuration information of the MBMS.

Another aspect of the embodiments of the present invention is to provide a multi-cell/multicast coordination entity MCE, including:

the system comprises a receiving module, a sending module and a receiving module, wherein the receiving module is used for receiving a request for establishing a Multimedia Broadcast Multicast Service (MBMS) service sent by a group communication service application server (GCS AS), and the request comprises area information or cell information;

a determining module, configured to determine a sending mode of the MBMS service according to the request;

the distribution module is used for distributing a unified group radio network temporary identifier G-RNTI to the MBMS when the transmission mode of the MBMS is a single-cell point-to-multipoint SC-PTM mode;

a sending module, configured to send a request for establishing the MBMS service, which carries the SC-PTM mode and the G-RNTI, to an eNodeB, so that the eNodeB uses the G-RNTI uniformly allocated by the MCE when the eNodeB sends the MBMS service in the SC-PTM mode in a cell corresponding to the eNodeB, and the eNodeB is the eNodeB corresponding to the area information or the cell information.

Another aspect of the embodiments of the present invention provides an eNodeB, including:

a receiving module, which is used for receiving a request carrying an SC-PTM mode and a G-RNTI sent by MCE for establishing the MBMS;

the distribution module is used for taking the G-RNTI distributed by the MCE as the G-RNTI of the MBMS and distributing wireless resources for the MBMS;

and the sending module is used for broadcasting the G-RNTI of the MBMS, the distributed wireless resources and a cell list which is used for broadcasting the MBMS at the periphery as configuration information of the MBMS to User Equipment (UE) in a cell through a single-cell multimedia broadcast multicast service control channel (SC-MCCH), wherein the configuration information comprises mark information which is used for marking whether the G-RNTI is the G-RNTI uniformly distributed by the MCE.

Another aspect of the embodiments of the present invention provides a UE, including:

a receiving module, configured to receive a system information block 20SIB20 to obtain configuration information of a single cell multimedia broadcast multicast service control channel SC-MCCH; receiving the SC-MCCH according to the configuration information of the SC-MCCH, and acquiring the configuration information of each MBMS provided by the current cell;

the control module is used for selecting one MBMS service from each MBMS service and indicating the receiving module to receive the MBMS service;

the receiving module is further configured to receive the MBMS service according to the configuration information of the MBMS service according to the indication of the control module;

the control module is used for indicating the receiving module to continue receiving the MBMS service in a target cell through a PDCCH (physical downlink control channel) scrambled by G-RNTI (global radio network temporary identity) blind detection when the UE performs cell reselection or handover in the current cell and if the configuration information of the MBMS service obtained from the SC-MCCH (service center control channel) of the current cell comprises mark information which indicates that the MBMS service uses the unified G-RNTI;

the receiving module is also used for receiving the MBMS through the PDCCH scrambled by the G-RNTI blind detection in the target cell according to the indication of the control module;

the receiving module is further configured to, when the UE receives SIB20 in the target cell, start receiving an SC-MCCH according to SC-MCCH configuration information, and obtain configuration information of each MBMS service on the SC-MCCH;

the control module is used for extracting the configuration information of the MBMS from the configuration information of each MBMS in a target cell, indicating the receiving module to stop receiving the MBMS in a target cell in a blind detection mode and receiving the MBMS according to the configuration information;

and the receiving module is also used for receiving the MBMS according to the extracted configuration information of the MBMS when the PDCCH scrambled by the G-RNTI is stopped being blindly detected by the target cell according to the indication of the control module.

According to the method and the device for improving the continuity of the MBMS service in the LTE system, provided by the embodiment of the invention, when one MBMS service or group service is broadcasted in a certain area in the system for sending the MBMS service or the group service, G-RNTI is uniformly distributed for the service, each cell for broadcasting the service adopts the uniformly distributed G-RNTI to mark the service at an empty port, the PDCCH scrambled by the G-RNTI carries the scheduling information of the service, and the PDSCH scrambled by the G-RNTI carries the service data. In the process of cell retransmission or switching, the UE can obtain the scheduling information of the service in the target cell by blindly detecting the PDCCH scrambled by the G-RNTI, and then directly receive the PDSCH scrambled by the G-RNTI to obtain service data. The PDCCH scrambled by the G-RNTI is detected blindly, so that the MBMS can be received without waiting for obtaining the specific configuration of the MBMS, and the time delay of service recovery can be greatly reduced. And the system performance is improved. Meanwhile, the sending method does not need the UE to enter a connected state.

Drawings

Fig. 1 is a flowchart of a method for improving MBMS service continuity in an LTE system according to an embodiment of the present invention;

fig. 2 is a flowchart of a method for improving MBMS service continuity in an LTE system according to another embodiment of the present invention;

fig. 3 is a structural diagram of a multi-cell/multicast coordination entity MCE according to an embodiment of the present invention;

fig. 4 is a structural diagram of an eNodeB according to an embodiment of the present invention;

fig. 5 is a structural diagram of a user equipment UE according to an embodiment of the present invention.

Detailed Description

The 3GPP protocol introduces SC-PTM characteristics in EUTRAN: and transmitting the MBMS service in an SC-PTM mode. Specifically, the MBMS service establishment procedure is as follows:

1) the GCS AS sends a request for establishing an MBMS service to the MCE through a relevant network element. The request carries area information or cell information.

2) After receiving the corresponding request, the MCE determines the transmission mode of the MBMS: SC-PTM mode or MBSFN mode.

3) And when the MCE determines that the MBMS is transmitted in the SC-PTM mode, the MCE transmits a request for transmitting the MBMS in the SC-PTM mode to a corresponding eNodeB. The corresponding eNodeB is the eNodeB corresponding to the area information or the cell information.

4) After receiving the request, the eNodeB allocates G-RNTI and time domain resources for the MBMS, and broadcasts the G-RNTI, the allocated time domain resources and a surrounding cell list broadcasting the service as configuration information of the MBMS to UE in a cell through SC-MCCH.

5) And when the data of the service is sent each time, the eNodeB allocates frequency domain resources and MCS to the service through dynamic scheduling, sends the scheduling information of the MBMS in the cell through the PDCCH scrambled by the G-RNTI, and sends the data of the MBMS through the PDSCH scrambled by the G-RNTI.

6) And the UE receives the SIB20 to obtain the configuration information of the SC-MCCH, and then receives the SC-MCCH according to the configuration information of the SC-MCCH to obtain the configuration information of each MBMS service in the cell.

7) UE selects an MBMS service, receives the service according to the configuration information of the service: the UE monitors the PDCCH scrambled by the G-RNTI in a plurality of subframes indicated by the MBMS time domain resource information in the configuration information of the service, when the PDCCH scrambled by the G-RNTI is detected in one subframe, the scheduling information of the MBMS on the PDCCH is obtained, and then the PDSCH scrambled by the G-RNTI is received in the same subframe according to the scheduling information to obtain the data of the MBMS.

The above method causes in the cell reselection or handover process: the interruption time of the MBMS service is large. In order to improve the continuity of the MBMS service, the present invention provides a method for improving the continuity of the MBMS service in an LTE system by taking an SC-PTM characteristic in EUTRAN in a 3GPP protocol as an example, and fig. 1 is a flowchart of a method for improving the continuity of the MBMS service in the LTE system provided by an embodiment of the present invention. The method comprises the following specific steps:

and step S101, the MCE and the eNodeB negotiate, and a part of Radio Network Temporary Identifier (RNTI) resources are reserved between the MCE and the eNodeB.

And a part of RNTI resources are reserved in advance through negotiation between the MCE and the eNB which is controlled by the MCE and supports the SC-PTM characteristic. The RNTI resource is used for the MCE to uniformly distribute G-RNTI for the MBMS sent in the SC-PTM mode. When the eNB allocates the relevant RNTI to the UE in the cell, the preserved RNTI is not used.

Step S102, a multi-cell/multicast coordination entity MCE receives a request for establishing a multimedia broadcast multicast service MBMS service sent by a group communication service application server GCS AS, wherein the request comprises area information or cell information.

The GCS AS sends a request for establishing an MBMS service to the MCE through a relevant network element. The request carries area information or cell information.

Step S103, the MCE determines the sending mode of the MBMS according to the request.

After receiving the corresponding request, the MCE determines a transmission mode of the MBMS service, where the transmission mode of the MBMS service includes: SC-PTM mode or MBSFN mode.

Step S104, if the sending mode of the MBMS is a single-cell point-to-multipoint SC-PTM mode, the MCE distributes a unified group radio network temporary identifier G-RNTI to the MBMS.

When the MCE determines that the MBMS is sent in an SC-PTM mode, the unified G-RNTI is distributed to the MBMS from the reserved RNTI resources.

Step S105, the MCE sends the request carrying the SC-PTM mode and the G-RNTI for establishing the MBMS to an eNodeB, so that the eNodeB uses the G-RNTI uniformly distributed by the MCE when the corresponding cell sends the MBMS in the SC-PTM mode, and the eNodeB is the eNodeB corresponding to the area information or the cell information.

And the MCE sends a request for sending the MBMS service in an SC-PTM mode to a corresponding eNodeB. The corresponding eNodeB is the eNodeB corresponding to the area information or the cell information. The sending mode of the MBMS carried in the request is as follows: SC-PTM mode and G-RNTI uniformly distributed by MCE

Step S106, the eNodeB receives the request which is sent by the MCE and carries the SC-PTM mode and the G-RNTI for establishing the MBMS.

And step S107, the eNodeB takes the G-RNTI distributed by the MCE as the G-RNTI of the MBMS and distributes wireless resources for the MBMS.

And after receiving the request sent by the MCE, the eNodeB takes the G-RNTI allocated by the MCE as the G-RNTI of the MBMS and allocates wireless resources for the MBMS.

In this embodiment, the eNodeB allocates radio resources for the MBMS service, including: and the eNodeB allocates radio resources to the MBMS according to a preset rule so that the UE receives the MBMS in a target cell through a PDCCH (physical downlink control channel) scrambled by blind detection G-RNTI (radio network temporary identifier) in a cell reselection or switching process, wherein the preset rule comprises a modulation mode of the MBMS or a configuration mode of a transmission power parameter of the MBMS.

The pre-specification includes any one of:

provision of (1): the eNodeB only uses quadrature phase shift keying QPSK modulation to send the MBMS service scheduled by the G-RNTI which is uniformly distributed by the MCE, and does not use high-order modulation;

provision of (2): when the MBMS service uses high-order modulation, and the eNodeB transmits the MBMS service, the transmission power parameter is a fixed value, preferably, PA is 0dB, ρ is_B/ρ_A＝1；

Provision of (3): when the MBMS uses high-order modulation, all MBMS use unified PA and PB, and the transmission power parameters PA and PB are configured through SIB 1; or, uniformly distributing PA and PB for the same type of service according to the service type, and configuring the transmission power parameters PA and PB of the corresponding type of service through SIB 1; for example, such as: and uniformly distributing PA and PB to all voice services, uniformly distributing PA and PB to data services, and uniformly distributing PA and PB to video services. The PA and PB assigned to a certain type of traffic, configured through SIB1, all traffic of that type uses the set of power parameters. Of course, the PB of all MBMS services may be the same without distinguishing the service type.

Provision of (4): when the MBMS uses high-order modulation, all MBMS use unified PA and PB, and the transmission power parameters PA and PB are configured through SIB 2; or, the PA and PB are uniformly allocated to the same type of service according to the service type, and the transmission power parameters PA and PB are configured through the SIB 2. For example, the PA and PB are uniformly allocated to all voice services, all using the set of power parameters, and are configured through the SIB 2. Of course, the PB of all MBMS services may be the same without distinguishing the service type.

Step S108, the eNodeB takes the G-RNTI of the MBMS, the distributed wireless resources and a cell list which is used for broadcasting the MBMS at the periphery as configuration information of the MBMS and broadcasts the configuration information to User Equipment (UE) in a cell through a single-cell multimedia broadcast multicast service control channel (SC-MCCH), wherein the configuration information comprises mark information which is used for marking whether the G-RNTI is the G-RNTI which is uniformly distributed by the MCE.

And the eNB takes the G-RNTI of the MBMS, the distributed wireless resources and the surrounding cells broadcasting the MBMS as configuration information of the MBMS and broadcasts the configuration information to the UE in the cells through SC-MCCH. And adding a FLAG in the configuration information of the MBMS to indicate that the MBMS uses the unified G-RNTI.

FLAG was introduced to ensure network compatibility. And the FLAG is 1 or TRUE indicates that the G-RNTI of the corresponding MBMS service is uniformly distributed by the MCE. When the configuration information of the MBMS does not have the mark, the G-RNTI of the corresponding MBMS is automatically distributed by the cell, which corresponds to the scene that the G-RNTI of the MBMS in the SC-PTM characteristic in the 3GPP protocol is automatically distributed by the cell.

1) FLAG is used to distinguish between networks supporting the present invention and networks supporting only SC-PTMs defined in existing protocols.

2) The FLAG is also used for distinguishing the allocation mode of the MBMS service G-RNTI in the network supporting the present invention: whether uniformly assigned by the MCE or individually assigned per cell. When the reserved G-RNTI resources in the MCE are all distributed and no residual G-RNTI is distributed to one MBMS, the G-RNTI is required to be distributed to the MBMS by each cell. In this scenario, the configuration information of the corresponding service does not include FLAG, thereby indicating: the G-RNTI allocation mode is as follows: the cells are allocated independently.

Step S109, the eNodeB sends the scheduling information of the MBMS through the physical downlink control channel PDCCH scrambled by the G-RNTI, wherein the scheduling information comprises the frequency domain resource and the modulation and coding strategy MCS used by the MBMS.

Step S110, the eNodeB determines the transmitting power of the PDSCH corresponding to the MBMS according to the transmitting power parameter of the MBMS, wherein the transmitting power parameter of the MBMS comprises PA, PB and rho_B/ρ_AThe PA is used for identifying the ratio of the transmitting power of the class-A PDSCH symbol to the transmitting power of the cell reference signal, and the PB is used for identifying the ratio rho of the transmitting power of the class-B PDSCH symbol to the transmitting power of the class-A PDSCH symbol_B/ρ_AThe said rho_B/ρ_ARepresents the ratio of the transmission power of the class B PDSCH symbol to the transmission power of the class a PDSCH symbol.

And step S111, the eNodeB sends the Physical Downlink Shared Channel (PDSCH) scrambled by the G-RNTI in the same subframe sending the PDCCH according to the transmitting power, and the PDSCH bears the data of the MBMS.

In addition, the method provided by the embodiment of the invention is not only suitable for SC-PTM characteristics in EUTRAN, but also suitable for a private network based on LTE technology. .

In the embodiment of the invention, when an MBMS or group service is broadcasted in a certain area in a system for sending the MBMS or the group service, G-RNTI is uniformly distributed for the service, each cell for broadcasting the service adopts the uniformly distributed G-RNTI to mark the service at an air interface, the PDCCH scrambled by the G-RNTI carries scheduling information of the service, and the PDSCH scrambled by the G-RNTI carries service data. In the process of cell retransmission or switching, the UE can obtain the scheduling information of the service in the target cell by blindly detecting the PDCCH scrambled by the G-RNTI, and then directly receive the PDSCH scrambled by the G-RNTI to obtain service data. The PDCCH scrambled by the G-RNTI is detected blindly, so that the MBMS can be received without waiting for obtaining the specific configuration of the MBMS, and the time delay of service recovery can be greatly reduced. And the system performance is improved. Meanwhile, the sending method does not need the UE to enter a connected state.

Fig. 2 is a flowchart of a method for improving MBMS service continuity in an LTE system according to another embodiment of the present invention. The method provided by this embodiment is explained from a corresponding receiving method at the UE side, and the method specifically includes the following steps:

step S201, the user equipment UE obtains the configuration information of the single-cell multimedia broadcast multicast service control channel SC-MCCH by receiving the system information block 20SIB 20.

Step S202, the UE receives the SC-MCCH according to the configuration information of the SC-MCCH and obtains the configuration information of each MBMS provided by the current cell.

For the UE in idle state or RRC connection state in the cell, the SCI-MCCH configuration information is obtained by receiving SIB20, the SC-MCCH is received according to the configuration information, and the configuration information of each MBMS service provided by the current cell is obtained.

Step S203, the UE selects an MBMS service from each MBMS service provided by the current cell, and receives the MBMS service according to the configuration information of the MBMS service. The configuration information of the MBMS service includes: the system comprises the G-RNTI of the MBMS, occupied wireless resources, a cell list for broadcasting the MBMS at the periphery and mark information, wherein the mark information is used for marking whether the G-RNTI of the MBMS is uniformly distributed by MCE.

And when the G-RNTI is uniformly distributed by the MCE, in a surrounding cell broadcasting the MBMS, sending the scheduling information of the MBMS by using the PDCCH scrambled by the G-RNTI and sending the data of the MBMS by using the PDSCH scrambled by the G-RNTI.

Specifically, the UE monitors PDCCH scrambled by the G-RNTI in a plurality of related subframes according to MBMS wireless resource information (namely, time domain resource information) and the G-RNTI of the MBMS in the configuration information of the MBMS, when the PDCCH scrambled by the G-RNTI is detected in one subframe, the scheduling information of the MBMS on the PDCCH is obtained, and the PDSCH scrambled by the G-RNTI is received in the same subframe according to the scheduling information to obtain the data of the MBMS.

Step S204, when the UE performs cell reselection or handover in the current cell, if the configuration information of the MBMS obtained from the SC-MCCH of the current cell includes flag information, and the flag information indicates that the MBMS uses the unified G-RNTI, the UE receives the MBMS in a target cell through blind detection of the PDCCH scrambled by the G-RNTI.

The method comprises the following specific steps:

1) the UE receives the physical broadcast channel PBCH and then obtains other necessary information.

2) And the UE blindly detects the PDCCH scrambled by the G-RNTI in a target cell according to the information on the PBCH and other necessary information.

In the current scene, the UE only knows that the MBMS uses the unified G-RNTI in the target cell and does not know the time domain resource configuration information of the MBMS in the target cell. Therefore, the UE can only detect the PDCCH scrambled by the G-RNTI in all subframes where the MBMS service may be transmitted in a blind detection manner, that is, in a probing manner, to obtain scheduling information of the MBMS service, so as to obtain data of the MBMS service on the corresponding PDSCH.

3) The blind detection of the PDCCH scrambled by the G-RNTI by the UE in the target cell specifically comprises the following steps: and detecting the PDCCH scrambled by the G-RNTI in a related subframe, after detecting the PDCCH scrambled by the G-RNTI in one subframe, the UE acquires scheduling information of the MBMS from the PDCCH, and receives the PDSCH scrambled by the G-RNTI in the same subframe according to the scheduling information to acquire data of the MBMS.

In this embodiment, the UE obtaining other necessary information is performed based on a pre-specification; the UE detects the PDCCH scrambled by the G-RNTI in the relevant subframe, and the method comprises the following steps:

based on the pre-specification (1) or (2), after the UE receives PBCH (MIB) in the target cell, the UE detects the PDCCH scrambled by the G-RNTI in each subframe in the target cell, and the UE does not need other necessary information except the information on the PBCH;

based on the presetting (1) or (2), for time division duplex TDD, after receiving PBCH (MIB) in a target cell, the UE further receives SIB1, and after receiving SIB1 to obtain uplink and downlink ratio of TDD, the UE detects the PDCCH scrambled by G-RNTI in each PDCCH subframe in the target cell; here, the PDCCH subframe refers to a subframe having a PDCCH.

Based on the presetting (3), the UE receives SIB1 after receiving PBCH (MIB) in a target cell, and detects the PDCCH scrambled by the G-RNTI in each PDCCH subframe in the target cell after receiving SIB1 to obtain the uplink and downlink ratio of TDD and the power parameters PA and PB of the MBMS service;

based on the presetting (4), the UE receives SIB1 after receiving PBCH (MIB) at the target cell, obtains the scheduling information of SIB2 from the scheduling information of SI on SIB1, and receives SIB 2; after receiving the SIB2, the UE detects the G-RNTI scrambled PDCCH every PDCCH subframe in the target cell according to the uplink and downlink mixture ratio of TDD obtained from the SIB1 and the power parameters PA and PB of the MBMS service obtained from the SIB 2.

Step S205, when the UE receives SIB20 in the target cell, the UE starts to receive SC-MCCH according to the SC-MCCH configuration information.

Step S206, after the UE obtains the configuration information of each MBMS service on the SC-MCCH by receiving the SC-MCCH, the UE extracts the configuration information of the MBMS service currently received by blind detection.

Step S207, the UE stops the blind detection of the PDCCH scrambled by the G-RNTI in the target cell, and receives the MBMS according to the extracted configuration information of the MBMS.

In addition, when the MBMS service adopts non-QPSK amplitude modulation, the UE receives SIB1 or SIB2, SIB1 or SIB2 configures PA and PB used by PDSCH corresponding to SC-MTCH of the MBMS service; the UE codes PDSCH according to the PA and PB on SIB1 or SIB 2.

PA and PB and ρ_B/ρ_AThe definitions of (A) are as follows:

a method for setting PDSCH transmit power is defined in the 3GPP protocol, and symbols on the PDSCH are divided into two types according to the difference between the relative positions of Resource Elements (REs) mapped to the symbols on the PDSCH and the relative positions of REs mapped to Cell Reference Signals (CRS): class a PDSCH symbols and class B PDSCH symbols. The class a PDSCH symbols refer to: the REs mapped by the PDSCH symbols and the REs mapped by the CRS are not on the same Orthogonal Frequency Division Multiplexing (OFDM) symbol. The class B PDSCH symbols refer to: the REs mapped by the PDSCH symbols and the REs mapped by the CRS are on the same OFDM symbol.

Rho is used as the ratio of the transmission power of the class-A PDSCH symbol to the transmission power of the cell reference signal_ARepresents that the ratio of the transmission power of the type B PDSCH symbol to the transmission power of the cell reference signal is represented by rho_BRepresents the ratio of the transmission power of the class B PDSCH symbol to the transmission power of the class A PDSCH symbol as ρ_B/ρ_AAnd (4) showing.

The first identification information is used for identifying the ratio of the transmission power of the class-A PDSCH symbol to the transmission power of the cell reference signal, and the first identification information is represented by PA.

The second identification information is used for identifying the ratio of the transmission power of the class B PDSCH symbol to the transmission power of the class A PDSCH symbol, the second identification information is represented by PB, and the PB and the rho are represented by the number of special antenna ports of different cells_B/ρ_ACan be represented by table 1:

TABLE 1

In the embodiment of the invention, when an MBMS or group service is broadcasted in a certain area in a system for sending the MBMS or the group service, G-RNTI is uniformly distributed for the service, each cell for broadcasting the service adopts the uniformly distributed G-RNTI to mark the service at an air interface, the PDCCH scrambled by the G-RNTI carries scheduling information of the service, and the PDSCH scrambled by the G-RNTI carries service data. In the process of cell retransmission or switching, the UE can obtain the scheduling information of the service in the target cell by blindly detecting the PDCCH scrambled by the G-RNTI, and then directly receive the PDSCH scrambled by the G-RNTI to obtain service data. The PDCCH scrambled by the G-RNTI is blindly detected, so that the MBMS can be received without waiting for the specific configuration of the MBMS obtained through SC-MCCH, and the time delay of service recovery can be greatly reduced. And the system performance is improved. Meanwhile, the sending method does not need the UE to enter a connected state.

Fig. 3 is a structural diagram of a multi-cell/multicast coordination entity MCE according to an embodiment of the present invention. The multi-cell/multicast coordination entity MCE provided in the embodiment of the present invention may execute the processing procedure provided in the method embodiment for improving the MBMS service continuity in the LTE system, as shown in fig. 3, the multi-cell/multicast coordination entity MCE includes a receiving module 31, a determining module 32, an allocating module 33, and a sending module 34. The receiving module 31 is configured to receive a request for establishing a multimedia broadcast multicast service MBMS service sent by a group communication service application server GCS AS, where the request includes area information or cell information; the determining module 32 is configured to determine a sending mode of the MBMS service according to the request; the allocation module 33 is used for allocating a unified group radio network temporary identifier G-RNTI to the MBMS service when the transmission mode of the MBMS service is a single-cell point-to-multipoint SC-PTM mode; the sending module 34 is configured to send a request for establishing the MBMS service, which carries the SC-PTM mode and the G-RNTI, to an eNodeB, so that the eNodeB uses the G-RNTI uniformly allocated by the MCE when the eNodeB sends the MBMS service in the SC-PTM mode in a cell corresponding to the eNodeB, and the eNodeB is the eNodeB corresponding to the area information or the cell information.

In addition, a part of Radio Network Temporary Identifier (RNTI) resources are reserved between the MCE and the eNodeB. The allocating module 33 is specifically configured to allocate a unified group radio network temporary identifier G-RNTI to the MBMS from the reserved RNTI resource.

Fig. 4 is a structural diagram of an eNodeB according to an embodiment of the present invention. The eNodeB provided in the embodiment of the present invention may execute the processing procedure provided in the method embodiment for improving the MBMS service continuity in the LTE system, and as shown in fig. 4, the eNodeB includes: a receiving module 41, an allocating module 42, and a sending module 43, where the receiving module 41 is configured to receive a request carrying an SC-PTM mode and a G-RNTI for establishing an MBMS service, which is sent by an MCE; the allocation module 42 is configured to use the G-RNTI allocated by the MCE as a G-RNTI of an MBMS service, and allocate a radio resource for the MBMS service; the sending module 43 is configured to broadcast, as configuration information of the MBMS service, the G-RNTI, the allocated radio resource, and a cell list around the cell, where the cell is configured to broadcast the MBMS service, to user equipment UE in a cell through a single-cell multimedia broadcast multicast service control channel SC-MCCH, where the configuration information includes flag information, and the flag information is used to identify whether the G-RNTI is the G-RNTI uniformly allocated by the MCE.

In addition, the sending module 43 is further configured to send scheduling information of the MBMS service through a physical downlink control channel PDCCH scrambled by the G-RNTI, where the scheduling information includes a frequency domain resource and a modulation and coding strategy MCS used by the MBMS service.

The eNodeB also comprises: a determining module 44, where the determining module 44 is configured to determine, according to the transmission power parameter of the MBMS service, the transmission power of the PDSCH corresponding to the MBMS service, where the transmission power parameter of the MBMS service includes PA, PB, and ρ_B/ρ_AThe PA is used for identifying the ratio of the transmitting power of the class-A PDSCH symbol to the transmitting power of the cell reference signal, and the PB is used for identifying the ratio rho of the transmitting power of the class-B PDSCH symbol to the transmitting power of the class-A PDSCH symbol_B/ρ_AThe said rho_B/ρ_ARepresents a ratio of transmission power of a class B PDSCH symbol to transmission power of a class A PDSCH symbol;

the sending module 43 is specifically configured to send the PDSCH of the physical downlink shared channel scrambled by the G-RNTI in the same subframe where the PDCCH is sent according to the transmission power, where the PDSCH carries data of the MBMS service.

The allocating module 42 is specifically configured to allocate radio resources to the MBMS service according to a predefined rule, so that the UE receives the MBMS service in a target cell through blind detection of a PDCCH scrambled by a G-RNTI in a cell reselection or handover process, where the predefined rule includes a modulation mode of the MBMS service or a configuration mode of a transmission power parameter of the MBMS service.

The pre-specification includes any one of:

Provision of (3): when the MBMS uses high-order modulation, all MBMS use unified PA and PB, and the transmission power parameters PA and PB are configured through SIB 1; or, uniformly distributing PA and PB for the same type of service according to the service type, and configuring the transmission power parameters PA and PB of the corresponding type of service through SIB 1; of course, the PB of all MBMS services may be the same without distinguishing the service type.

Provision of (4): when the MBMS uses high-order modulation, all MBMS use unified PA and PB, and the transmission power parameters PA and PB are configured through SIB 2; or, the PA and PB are uniformly allocated to the same type of service according to the service type, and the transmission power parameters PA and PB are configured through the SIB 2. Of course, the PB of all MBMS services may be the same without distinguishing the service type.

Fig. 5 is a structural diagram of a user equipment UE according to an embodiment of the present invention. The UE according to the embodiment of the present invention may execute the processing procedure provided in the embodiment of the method for improving the MBMS service continuity in the LTE system, and as shown in fig. 5, the UE includes: the system comprises a receiving module 51 and a control module 52, wherein the receiving module 51 is configured to receive a system information block 20SIB20 to obtain configuration information of a single cell multimedia broadcast multicast service control channel SC-MCCH; receiving the SC-MCCH according to the configuration information of the SC-MCCH, and acquiring the configuration information of each MBMS provided by the current cell;

the control module 52 is configured to select an MBMS service from the MBMS services, and instruct the receiving module 51 to receive the MBMS service;

the receiving module 51 is further configured to receive the MBMS service according to the configuration information of the MBMS service according to the indication of the control module 52;

the control module 52 is configured to, when the UE performs cell reselection or handover in a current cell, instruct the receiving module 51 to continue receiving the MBMS service in a target cell through a PDCCH scrambled by a blind detection G-RNTI if configuration information of the MBMS service obtained from an SC-MCCH of the current cell includes flag information indicating that the MBMS service uses a unified G-RNTI.

The receiving module 51 is further configured to receive the MBMS service through a PDCCH scrambled by a blind detection G-RNTI in a target cell according to an instruction of the control module 52;

the receiving module 51 is further configured to, when the UE receives the SIB20 in the target cell, start receiving an SC-MCCH according to the SC-MCCH configuration information, and obtain configuration information of each MBMS service on the SC-MCCH;

the control module 52 is configured to extract configuration information of the MBMS service from the configuration information of each MBMS service in the target cell, instruct the receiving module 51 to stop receiving the MBMS service in the target cell in a blind detection manner, and receive the MBMS service according to the configuration information;

the receiving module 51 is further configured to, according to the instruction of the control module 52, stop receiving the MBMS service according to the extracted configuration information of the MBMS service when the PDCCH scrambled by the G-RNTI is blindly detected in the target cell.

In addition, the receiving module 51 is specifically configured to monitor the PDCCH scrambled by the G-RNTI in a plurality of relevant subframes when the PDCCH scrambled by the G-RNTI is blind detected; when a PDCCH scrambled by G-RNTI is detected in a subframe, the scheduling information of the MBMS on the PDCCH is obtained, and the PDSCH scrambled by the G-RNTI is received in the same subframe according to the scheduling information to obtain the data of the MBMS.

The receiving module 51 is specifically configured to receive the physical broadcast channel PBCH, and then obtain other necessary information; and blind detecting the PDCCH scrambled by the G-RNTI in the target cell according to the information on the PBCH and other necessary information.

The UE obtaining other necessary information is performed based on a pre-specification; the receiving module 51 detects the PDCCH scrambled by the G-RNTI in the relevant subframe, and includes:

based on the presetting (1) or (2), for time division duplex TDD, after receiving PBCH (MIB) in a target cell, the UE further receives SIB1, and after receiving SIB1 to obtain uplink and downlink ratio of TDD, the UE detects a PDCCH scrambled by G-RNTI in each PDCCH subframe in the target cell;

based on the presetting (3), the UE receives SIB1 after receiving PBCH (MIB) in a target cell, and detects PDCCH scrambled by G-RNTI in each PDCCH subframe in the target cell after receiving SIB1 to obtain uplink and downlink ratio of TDD and power parameters PA and PB of MBMS service;

based on the presetting (4), the UE receives SIB1 after receiving PBCH (MIB) at the target cell, obtains the scheduling information of SIB2 from the scheduling information of SI on SIB1, and receives SIB 2; after receiving the SIB2, the UE detects the PDCCH scrambled by the G-RNTI in each PDCCH subframe in the target cell according to the uplink and downlink mixture ratio of TDD obtained from the SIB1 and the power parameters PA and PB of the MBMS service obtained from the SIB 2.

In the embodiment of the invention, when an MBMS or group service is broadcasted in a certain area in a system for sending the MBMS or the group service, G-RNTI is uniformly distributed for the service, each cell for broadcasting the service adopts the uniformly distributed G-RNTI to mark the service at an air interface, the PDCCH scrambled by the G-RNTI carries scheduling information of the service, and the PDSCH scrambled by the G-RNTI carries service data. In the process of cell retransmission or switching, the UE can obtain the scheduling information of the service in the target cell by blindly detecting the PDCCH scrambled by the G-RNTI, and then directly receive the PDSCH scrambled by the G-RNTI to obtain service data. The PDCCH scrambled by the G-RNTI is detected blindly, the MBMS can be received without waiting for obtaining the specific configuration of the MBMS on the SC-MCCH, and the time delay of service recovery can be greatly reduced. And the system performance is improved. Meanwhile, the sending method does not need the UE to enter a connected state.

In summary, in the embodiment of the present invention, in a system for sending an MBMS service or a group service, when an MBMS service or a group service is broadcast in a certain area, a G-RNTI is uniformly allocated to the service, each cell broadcasting the service identifies the service at an air interface by using the uniformly allocated G-RNTI, a PDCCH scrambled by the G-RNTI carries scheduling information of the service, and a PDSCH scrambled by the G-RNTI carries service data. In the process of cell retransmission or switching, the UE can obtain the scheduling information of the service in the target cell by blindly detecting the PDCCH scrambled by the G-RNTI, and then directly receive the PDSCH scrambled by the G-RNTI to obtain service data. The PDCCH scrambled by the G-RNTI is detected blindly, so that the MBMS can be received without waiting for obtaining the specific configuration of the MBMS, and the time delay of service recovery can be greatly reduced. And the system performance is improved. Meanwhile, the sending method does not need the UE to enter a connected state.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for improving MBMS service continuity in an LTE system is characterized by comprising the following steps:

the MCE determines a sending mode of the MBMS according to the request;

the MCE sends a request carrying the SC-PTM mode and the G-RNTI for establishing the MBMS to an eNodeB so that the eNodeB uses the G-RNTI uniformly distributed by the MCE when a cell corresponding to the eNodeB sends the MBMS in the SC-PTM mode, and the eNodeB is the eNodeB corresponding to the area information or the cell information;

before the multi-cell/multicast coordination entity MCE receives a request for establishing a multimedia broadcast multicast service MBMS service sent by a group communication service application server GCS AS, the method further includes:

negotiating between the MCE and the eNodeB, and reserving a part of Radio Network Temporary Identifier (RNTI) resources between the MCE and the eNodeB;

the MCE allocates a unified group radio network temporary identifier G-RNTI to the MBMS, and the method comprises the following steps:

and the MCE allocates a unified group radio network temporary identifier G-RNTI to the MBMS from the reserved RNTI resources.

2. A method for improving MBMS service continuity in an LTE system is characterized by comprising the following steps:

the eNodeB takes the G-RNTI of the MBMS, the distributed wireless resources and a cell list which is used for broadcasting the MBMS at the periphery as configuration information of the MBMS and broadcasts the configuration information to User Equipment (UE) in a cell through a single-cell multimedia broadcast multicast service control channel (SC-MCCH), wherein the configuration information comprises mark information which is used for marking whether the G-RNTI is the G-RNTI which is uniformly distributed by the MCE or not;

after the eNodeB takes the G-RNTI, the allocated radio resources, and the cell list of the MBMS service broadcasted around as the configuration information of the MBMS service and broadcasts the configuration information to the user equipment UE in the cell through the single-cell multimedia broadcast multicast service control channel SC-MCCH, the eNodeB further includes:

the eNodeB sends scheduling information of the MBMS through the physical downlink control channel PDCCH scrambled by the G-RNTI, wherein the scheduling information comprises frequency domain resources and a modulation and coding strategy MCS used by the MBMS;

the eNodeB determines the transmitting power of the PDSCH corresponding to the MBMS according to the transmitting power parameters of the MBMS, wherein the transmitting power parameters of the MBMS comprise PA, PB and rho_B/ρ_AThe PA is used for identifying the ratio of the transmitting power of the class-A PDSCH symbol to the transmitting power of the cell reference signal, and the PB is used for identifying the ratio rho of the transmitting power of the class-B PDSCH symbol to the transmitting power of the class-A PDSCH symbol_B/ρ_AThe said rho_B/ρ_ARepresents a ratio of transmission power of a class B PDSCH symbol to transmission power of a class A PDSCH symbol;

and the eNodeB sends the Physical Downlink Shared Channel (PDSCH) scrambled by the G-RNTI in the same subframe of the PDCCH according to the transmission power, wherein the PDSCH bears the data of the MBMS.

3. The method of claim 2, wherein the eNodeB allocates radio resources for the MBMS service, comprising:

the eNodeB allocates radio resources to the MBMS according to a preset rule so that the UE receives the MBMS in a target cell through a PDCCH (physical downlink control channel) scrambled by blind detection G-RNTI (radio network temporary identifier) in a cell reselection or switching process, wherein the preset rule comprises a modulation mode of the MBMS or a configuration mode of a transmission power parameter of the MBMS;

the pre-specification includes any one of:

provision of (2): when the MBMS uses high-order modulation, the eNodeB takes a fixed value as a transmission power parameter when transmitting the MBMS, PA is 0dB, and rho is_B/ρ_A＝1；

Provision of (3): when the MBMS uses high-order modulation, all MBMS use unified PA and PB, and the transmission power parameters PA and PB are configured through SIB 1; or, uniformly distributing PA and PB for the same type of service according to the service type, and configuring the transmission power parameters PA and PB of the corresponding type of service through SIB 1;

provision of (4): when the MBMS uses high-order modulation, all MBMS use unified PA and PB, and the transmission power parameters PA and PB are configured through SIB 2; or, the PA and PB are uniformly allocated to the same type of service according to the service type, and the transmission power parameters PA and PB are configured through the SIB 2.

4. A method for improving MBMS service continuity in an LTE system is characterized by comprising the following steps:

the UE stops the blind detection of the PDCCH scrambled by the G-RNTI in a target cell and receives the MBMS according to the extracted configuration information of the MBMS;

when the UE performs cell reselection or handover in a current cell, if configuration information of the MBMS service obtained from an SC-MCCH of the current cell includes flag information, and the flag information indicates that the MBMS service uses a unified G-RNTI, the UE receives the MBMS service in a target cell through a PDCCH scrambled by the G-RNTI in a blind detection mode, and the method comprises the following steps:

the UE receives a physical broadcast channel PBCH and then obtains preset scene configuration information;

the UE blindly detects the PDCCH scrambled by the G-RNTI in a target cell according to the information on the PBCH and preset scene configuration information to obtain the data of the MBMS;

the UE blindly detects the PDCCH scrambled by the G-RNTI in a target cell, and the method comprises the following steps:

and the UE detects the PDCCH scrambled by the G-RNTI in a related subframe, and after the PDCCH scrambled by the G-RNTI is detected in one subframe, the UE obtains the scheduling information of the MBMS from the PDCCH and receives the PDSCH scrambled by the G-RNTI in the same subframe according to the scheduling information to obtain the data of the MBMS.

5. The method of claim 4, wherein the UE obtaining the preset scene configuration information is performed based on a predefined rule;

the UE detects the PDCCH scrambled by the G-RNTI in the relevant subframe, and the method comprises the following steps:

based on the presetting (1) or (2), after the UE receives PBCH (MIB) in a target cell, the UE detects the PDCCH scrambled by the G-RNTI in each subframe in the target cell, and the UE does not need preset scene configuration information except information on the PBCH;

based on the presetting (1) or (2), for time division duplex TDD, after receiving PBCH (MIB) in a target cell, the UE further receives SIB1, and after receiving SIB1 to obtain uplink and downlink ratio of TDD, the UE detects the PDCCH scrambled by G-RNTI in each PDCCH subframe in the target cell;

based on the presetting (4), the UE receives SIB1 after receiving PBCH (MIB) at the target cell, obtains the scheduling information of SIB2 from the scheduling information of SI on SIB1, and receives SIB 2; after receiving the SIB2, the UE detects the PDCCH scrambled by the G-RNTI in each PDCCH subframe in a target cell according to the uplink and downlink mixture ratio of the TDD obtained from the SIB1 and the power parameters PA and PB of the MBMS obtained from the SIB 2;

wherein the predetermined specification includes any one of:

6. The method of claim 5, further comprising:

when the MBMS service adopts non-QPSK amplitude modulation, the UE receives SIB1 or SIB2, SIB1 or SIB2 configures PA and PB used by PDSCH corresponding to SC-MTCH of the MBMS service;

the UE codes PDSCH according to the PA and PB on SIB1 or SIB 2.

7. A multi-cell/multicast coordination entity, MCE, comprising:

a sending module, configured to send a request for establishing an MBMS service, which carries the SC-PTM mode and the G-RNTI, to an eNodeB, so that the eNodeB uses the G-RNTI uniformly allocated by the MCE when the eNodeB sends the MBMS service in the SC-PTM mode in a cell corresponding to the eNodeB, and the eNodeB is the eNodeB corresponding to the area information or the cell information;

reserving a part of Radio Network Temporary Identifier (RNTI) resources between the MCE and the eNodeB;

the allocation module is specifically configured to allocate a unified group radio network temporary identifier G-RNTI to the MBMS from the reserved RNTI resource.

8. An eNodeB, comprising:

a sending module, configured to broadcast, as configuration information of the MBMS service, the G-RNTI, the allocated radio resource, and a cell list around the MBMS service, which is used for broadcasting the MBMS service, to user equipment UE in a cell through a single-cell multimedia broadcast multicast service control channel SC-MCCH, where the configuration information includes flag information, and the flag information is used to identify whether the G-RNTI is the G-RNTI uniformly allocated by the MCE;

the sending module is further configured to send scheduling information of the MBMS service through the physical downlink control channel PDCCH scrambled by the G-RNTI, where the scheduling information includes a frequency domain resource and a modulation and coding scheme MCS used by the MBMS service;

the eNodeB further comprises:

a determining module, configured to determine, according to the transmission power parameter of the MBMS service, the transmission power of the PDSCH corresponding to the MBMS service, where the transmission power parameter of the MBMS service includes PA, PB, ρ_B/ρ_AThe PA is used for identifying the ratio of the transmitting power of the class-A PDSCH symbol to the transmitting power of the cell reference signal, and the PB is used for identifying the ratio rho of the transmitting power of the class-B PDSCH symbol to the transmitting power of the class-A PDSCH symbol_B/ρ_AThe said rho_B/ρ_ARepresents a ratio of transmission power of a class B PDSCH symbol to transmission power of a class A PDSCH symbol;

the sending module is specifically configured to send the PDSCH of the physical downlink shared channel scrambled by the G-RNTI in the same subframe where the PDCCH is sent according to the transmission power, where the PDSCH carries data of the MBMS service.

9. The eNodeB of claim 8, wherein the allocating module is specifically configured to allocate radio resources to the MBMS service according to a predefined rule, so that the UE receives the MBMS service in a target cell through blind detection of a PDCCH scrambled by a G-RNTI in a cell reselection or handover process, where the predefined rule includes a modulation mode of the MBMS service or a configuration mode of a transmission power parameter of the MBMS service;

the pre-specification includes any one of:

10. A User Equipment (UE), comprising:

the receiving module is also used for receiving the MBMS service according to the extracted configuration information of the MBMS service when the PDCCH scrambled by the G-RNTI is stopped being blindly detected in the target cell according to the indication of the control module

The receiving module is specifically used for monitoring the PDCCH scrambled by the G-RNTI in a plurality of related subframes when the PDCCH scrambled by the G-RNTI is detected in a blind mode; when a PDCCH scrambled by G-RNTI is detected in a subframe, the scheduling information of the MBMS on the PDCCH is obtained, and the PDSCH scrambled by the G-RNTI is received in the same subframe according to the scheduling information to obtain the data of the MBMS.

11. The UE of claim 10, wherein the receiving module is specifically configured to receive a physical broadcast channel PBCH and then obtain preset scene configuration information; and blind detecting the PDCCH scrambled by the G-RNTI in the target cell according to the information on the PBCH and preset scene configuration information.

12. The UE of claim 11, wherein the UE obtaining the preset scene configuration information is performed based on a predefined rule;

the receiving module detects the PDCCH scrambled by the G-RNTI in the relevant subframe, and the method comprises the following steps:

based on the presetting (1) or (2), after the UE receives PBCH (MIB) in a target cell, the UE detects the PDCCH scrambled by the G-RNTI in each subframe in the target cell, and the UE does not need preset scene configuration information except the information on the PBCH;

based on the presetting (4), the UE receives SIB1 after receiving PBCH (MIB) at the target cell, obtains the scheduling information of SIB2 from the scheduling information of SI on SIB1, and receives SIB 2; after receiving the SIB2, the UE detects the PDCCH scrambled by the G-RNTI in each PDCCH subframe in the target cell according to the uplink and downlink mixture ratio of the TDD obtained from the SIB1 and the power parameters PA and PB of the MBMS obtained from the SIB 2;

wherein the predetermined specification includes any one of: