CN101262635B - A Method for Realizing Enhanced MBMS Service in Multi-Carrier Cell - Google Patents

Abstract

A method for implementing enhanced MBMS services in a multi-carrier cell, comprising: in the multi-carrier cell, dividing downlink time slots into MBSFN time slots and Non-MBSFN time slots; configuring the same part of MBMS services in each cell to the MBSFN time slots above; configure the specific part of the MBMS service in each cell to the Non-MBSFN time slot; send the configuration information to the user terminal in the entire multi-carrier cell; the user terminal receives the MBMS service according to the configuration information. After adopting the method of the invention, the receiving gain of the user terminal can be improved through multipath combination for the same part of MBMS services in each cell.

Description

A Method for Realizing Enhanced MBMS Service in Multi-Carrier Cell

technical field

The present invention relates to the field of wireless communication, in particular to an enhanced multimedia broadcast and multicast service in a multi-frequency cell in a Time Division Code Synchronization Division Multiple Access (TD-SCDMA) system (MBMS, Multimedia Broadcast Multicast Service) method.

Background technique

With the popularization of large-screen multi-functional mobile phones, the application of mobile data services is becoming more and more extensive. The demand for mobile communications is no longer satisfied with phone calls, messaging and mobile Internet browsing services. In order to effectively use mobile network resources, 3GPP proposed Multimedia Broadcast and Multicast Service (MBMS, MultimediaBroadcast Multicast Service), provides a point-to-multipoint service in which a data source sends data to multiple users in a mobile network, realizes network resource sharing, and improves the utilization of network resources, especially valuable air interface resources. MBMS service is a technology that shares network resources to transmit data from one data source to multiple destinations. MBMS defined by 3GPP can not only realize plain text low-rate message multicast and broadcast, but also realize multicast of high-speed multimedia services and broadcasting, providing a variety of rich video, audio and multimedia services. MBMS services include: multicast service (MulticastService) and broadcast service (Broadcast Service). Each multicast service requires a Joining (joining) process. The user terminal (UE) needs to go to the BM-SC (Broadcast-Multicast Service Center) to activate a certain multicast service. For each broadcast service, The UE only needs to be activated locally. In the wireless bearer configuration, multicast services can use P-T-M (point-to-multipoint, also can be abbreviated as PTM or ptm) and P-T-P (point-to-point, can also be abbreviated as PTP or ptp) bearer types, while broadcast services can only use P-T-M.

MBSFN (MBMS single Frequency Network, MBMS single frequency network) technology is an enhanced MBMS technology, referred to as enhanced MBMS technology, all adjacent base stations transmit the same wireless signal synchronously, as shown in Figure 1. Signals from different base stations are regarded as multipath signals, and MBSFN greatly improves spectrum utilization.

For TD-SCDMA system, because the characteristic of MBMS business mode is that there is no terminal uplink feedback signal during business in many scenarios, smart antenna is no longer suitable for MBMS business mode, so MBSFN technology is very important for improving the performance of MBMS business in TD-SCDMA system Gain and noise reduction are very beneficial.

In the MBSFN time slot, the base stations of each cell use the same frequency, the same scrambling code, and the same midamble (midamble) code to send the same MBMS data content, so that the UE can view the same content received from multiple cells as Same as the multipath of a cell, it can improve the gain of UE receiving MBMS service. In the MBSFN time slot, the MBMS service is only carried in the P-T-M mode. In addition to MBSFN time slots, other downlink time slots that carry MBMS channels, including MCCH (MBMS Control Channel), MICH (MBMS Indicator Channel) or MTCH (MBMS Traffic Channel) are Non-MBSFN time slots. In Non-MBSFN time slots, The base stations of each cell are not required to use the same frequency, the same scrambling code, and the same midamble code to send the same MBMS data content, so the MBMS service content received by the UE in the Non-MBMS time slot will not obtain additional gain.

For some MBMS services, such as: mobile TV, when the TV channels of each cell are the same, they can be sent on the MBSFN time slot, so that since each cell sends the same TV channel on the MBSFN time slot, the UE receives the TV channel good gain can be obtained when using the signal; and for the MCCH channel and MICH of MBMS, and some MBMS services carried on the MTCH (such as: information specific to each cell, cell service information, etc.), due to the MCCH of each cell, The contents of MICH and some MTCHs (programs specific to this cell) are different. These MBSM channels are sent on Non-MBSFN time slots, and the UE cannot obtain gain when receiving these channels.

In the TD-SCDMA system, by introducing enhanced MBMS technology, that is, dividing the downlink time slot of a radio frame into MBSFN time slot and Non-MBSFN time slot, the gain of UE receiving MBMS service can be improved.

The TD-SCDMA system in the current 3GPP agreement is a single-carrier system, that is, one cell corresponds to one carrier, and the spectrum width of a single carrier is 1.6M. Since TD-SCDMA adopts a relatively narrow-band TDD (Time Division Duplex) mode, The theoretical peak rate is 2.8Mbps, and some technical improvements are made on the basis of single-carrier cells, namely: in a TD-SCDMA cell, there are multiple carriers, so that the spectrum width of each cell is N*1.6M (N is each The number of carriers in the cell), which can meet the operator's higher demand for downlink packet data services.

MBMS services need to occupy a large amount of spectrum resources. If MBMS is carried in a single-frequency cell, that is, a single-carrier cell, it will inevitably affect the normal operation of ordinary services. If the MBMS service is carried in a multi-frequency cell, that is, a multi-carrier cell Cell, because the spectrum resources of this cell are relatively abundant, it will not affect ordinary services.

At present, in order to cover the power of the broadcast channel (BCH) of the cell to the entire cell, the BCH is carried on the TS0 (fixed downlink time slot) of the main carrier, while other carriers of the TS0 have no transmission power, that is to say, the TS0 All transmit power of each carrier is concentrated on the main carrier.

In the prior art, there is no method for carrying MBMS services in multi-carrier cells.

Contents of the invention

The purpose of the present invention is to provide a method for realizing enhanced MBMS service in a multi-carrier cell.

The technical scheme adopted in the present invention is:

A method for implementing enhanced MBMS services in a multi-carrier cell, comprising:

a. In multi-carrier cells, divide downlink time slots into MBSFN time slots and Non-MBSFN time slots; configure the same part of MBMS services in each cell to MBSFN time slots; configure the specific part of MBMS services in each cell to On the Non-MBSFN time slot;

b. Send the configuration information to the user terminals in the entire multi-carrier cell;

c. The user terminal receives the MBMS service according to the configuration information;

Wherein, in step a, configuring the same part of the MBMS service of each cell to the MBSFN time slot specifically includes: configuring the same part of the MBMS service channel of each cell to the main carrier of one or more MBSFN time slots or a certain On the auxiliary carrier; the same MBMS service channel configured by each cell on the MBSFN time slot should be on the same carrier as other cells; the specific MBMS service configuration of each cell on the Non-MBSFN time slot specifically includes: MBMS control channel , The MBMS indicator channel and the specific MBMS service channel of the cell are allocated to the main carrier of one or more Non-MBSFN time slots;

The transmit power of all carriers in the one or more Non-MBSFN time slots is concentrated on the main carrier for transmission;

The transmission power of all carriers in the one or more MBSFN time slots is concentrated on one carrier for transmission;

The step b specifically includes: the radio network controller sends the configured MBSFN time slot, Non-MBSFN time slot, and MBMS channel information to the user terminals in the entire multi-carrier cell through a system broadcast message; specifically includes radio network control The device configures a new information element in the system broadcast message to inform the user terminal which downlink time slot the MBSFN time slot is, which carrier bears the MBMS service, and the parameter identification of the cell.

Further, in the step a:

Only one MBMS control channel and one MBMS indicator channel are configured in each multi-carrier cell, and one or more MBMS service channels are configured.

Further, in the step b, the radio network controller sends the configured MBSFN time slots, Non-MBSFN time slots, and MBMS channel information to user terminals in the entire multi-carrier cell through high-level instructions.

Further, in the step b, the radio network controller notifies the user terminal whether the cell is configured with MBSFN time slots, and which downlink time slots these MBSFN time slots are, through the radio resource control message or the control information carried on the MBMS control channel. Which carrier bears the MBMS service and the parameter identifier of the cell.

Further, the step c is specifically:

The user terminal receives the MBMS control channel and/or the MBMS indicator channel on the main carrier of the Non-MBSFN time slot according to the configuration information of the MBMS control channel and/or the MBMS indicator channel;

When the user terminal wants to receive the MBMS service carried on the MBSFN time slot, read the information of the MBMS service channel according to the configuration information, and improve the receiving gain through multipath combination; when the user terminal wants to receive the MBMS service carried on the Non-MBSFN time slot In the case of MBMS service, the information of the MBMS service channel is received on the main carrier

After adopting the method of the invention, the receiving gain of the user terminal can be improved through multipath combination for the same part of MBMS services in each cell.

Description of drawings

FIG. 1 is a schematic diagram of MBMS enhancement technology in the prior art;

Fig. 2 is the flow chart of the method for realizing the enhanced MBMS service in the multi-carrier cell of the present invention;

FIG. 3 is a schematic diagram of the specific implementation of the method for realizing the enhanced MBMS service in a multi-carrier cell according to the present invention;

Fig. 4 is a schematic diagram of the specific implementation of the method for realizing the enhanced MBMS service in a multi-carrier cell according to the present invention.

Detailed ways

The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

The present invention explains how to carry the enhanced MBMS technology in a multi-frequency point cell, that is, how to realize the function of the enhanced MBMS technology in the multi-frequency point cell of the TD-SCDMA system.

The present invention implements enhanced MBMS services in multi-frequency cells on the basis of the existing multi-frequency point line standard, such as: mobile TV service (a kind of MBMS service, which is characterized in that multiple cells all send the same TV channel). Specifically as shown in Figure 2, firstly, because the TD-SCDMA system can perform time division multiplexing on one carrier, the downlink time slot carrying the MBMS traffic channel can be further divided into MBSFN time slot and Non-MBSFN time slot; MBSFN time slots are configured in Node B (Node B) of UTRAN (Universal Terrestrial Radio Access Network), so that mobile TV services can be carried on MBSFN time slots; then, RNC (Radio Resource Controller) broadcasts message or high-level signaling, to send the configuration parameters of MBSFN time slots and MBMS-related channels to the cell, so that the UE (user equipment) in the cell can receive the configuration information of UTRAN; in order to make the transmission power of MBMS cover the entire For the bearing method of the MBMS control channel and traffic channel in the cell, a method similar to BCH can also be adopted, that is, all the power of all carriers on the time slot bearing the MBMS channel is concentrated on one carrier for transmission.

Finally, UEs interested in mobile TV or other MBMS services can receive MBMS services (including mobile TV services) in these MBSFN time slots and Non-MBSFN time slots.

A specific embodiment will be introduced below in conjunction with FIG. 3 .

Fig. 3 is a schematic diagram of implementing the enhanced MBMS technology in an N-frequency cell by means of time division multiplexing.

First, in an N-frequency cell, divide the downlink time slot carrying the MBMS service channel into MBSFN time slot and Non-MBSFN time slot; then, configure MBSFN time slot and Non-MBSFN time slot in Node B of UTRAN , and configure MBMS control channel, indicator channel and traffic channel.

Usually, a multi-frequency cell has multiple frequency points, one primary frequency point and multiple secondary frequency points. Assume that the number of multi-frequency points is N=3, including one primary carrier and two secondary carriers. The broadcast channel (BCH) of the cell is carried on the TS0 of the main carrier.

Only one MCCH (MBMS Control Channel) and one MICH (MBMS Indicator Channel) are configured in each N-frequency cell, and they are all configured on Non-MBSFN time slots.

One or more MTCHs (MBMS service channels) can be configured in each N-frequency cell, some MTCHs are configured on Non-MBSFN time slots, and some MTCHs are configured on MBSFN time slots.

1) MCCH, MICH and part of MTCH (this part of MTCH bears the special MBMS service of the cell, such as hotels, restaurants, and shopping centers related to this cell) are configured on one or more Non-MBSFN time slots, and must be configured in this or On the main carrier of these time slots, and the transmission power of all carriers in this or these time slots is concentrated on the main carrier for transmission, and there is no transmission power on all auxiliary carriers.

The contents of MCCH and MICH in each cell are different, so they can only be configured in Non-MBSFN time slots. Some MTCHs of a cell carry the specific MBMS services of the cell, and these MTCHs can only be configured in Non-MBSFN time slots. superior.

The MBMS channels configured to Non-MBSFN time slots must be configured on the main carrier of these time slots, because in the N-frequency cell of the TD-SCDMA system, before the UE is assigned a dedicated channel, after selecting a cell, it first Residing on the primary carrier, the UE can listen to the system broadcast cell on the primary carrier, respond to paging, initiate random access procedures, etc., and the MBMS channel configured in the Non-MBSFN time slot does not need to perform macro diversity with adjacent cells. It does not need to be at the same frequency as the MBMS channel of the adjacent cell.

The power of all carriers in the Non-MBSFN time slot is concentrated on the main carrier for transmission. This is because, in order to ensure that the signal power of MCCH, MICH and MTCH can cover the entire multi-frequency cell, the configuration method of these logical channels is also A configuration method similar to that of the broadcast channel is adopted, that is, the full power of this time slot is transmitted on the main carrier, and no transmission power is used on the secondary carrier.

The Non-MBSFN time slot configured with MCCH, MICH or MTCH may also be a TS0 time slot. At this time, MBMS information and broadcast messages are transmitted at different time intervals (TS0 time slots of different radio frames) on the main carrier of TS0.

2) Part of MTCH (this part of MTCH carries the same MBMS service of each cell) is configured on one or more MBSFN time slots, and can be configured on the main carrier or a certain auxiliary carrier of this or these time slots, and this or these time slots The transmit power of all carriers in the slot is concentrated on this carrier, and there is no transmit power on all other carriers (if transmitting on a secondary carrier of MBSFN, the secondary carrier concentrates all the power of all carriers in the time slot , while other carriers, including the main carrier, have no transmit power in this time slot).

The MBMS channel allocated to the MBSFN time slot should be at the same frequency as other cells.

Part of the MBMS services in a cell are the same as those in neighboring cells, that is to say, these MBMS services are the same in multiple cells, such as mobile phone TV channels. Configuring these same MBMS services on MBSFN time slots, as shown in Figure 4, is a method to configure mobile TV channels in multiple cells and improve the receiving gain of UE through enhanced MBMS technology, such as: in 3 Cells (cell A, cell B, cell C, cell A has carrier frequencies f1, f2, f3; cell B has carrier frequencies f2, f3, f4; cell C has carrier frequencies f3, f4, f5, and the first frequency The frequency point is the primary frequency point, and the others are secondary frequency points; the MBSFN time slots of cell A are TS3 and TS4, the MBSFN time slots of cell B are TS4, and the MBSFN time slots of cell C are TS4 and TS5), all of which have the same A certain mobile TV channel, then the mobile TV channel is configured on the time slot 4 (f3, TS4) of the carrier frequency f3 of the cell A, and is configured on the time slot 4 of the carrier frequency f3 of the cell B (f3, TS4), It is also configured in time slot 4 of carrier frequency f3 of cell C (f3, TS4). In this way, the UE interested in the TV channel residing in cell A, or B, or C can obtain the MBMS signals of the three cells, just like the three multipaths of a wireless signal, and gain gain through macro diversity , to get better mobile TV reception quality.

When a carrier on a certain or some downlink time slots bears the weight of MBMS channels (including MICH or MCCH or MTCH), generally no power is allocated on other carriers of this or these downlink time slots, so that this or these downlink The power of all carriers in the time slot is concentrated on this carrier for transmission to improve the coverage of the MBMS channel. This method is the same as the current method for transmitting broadcast channels in multi-carriers.

Step 2: Send to the UE in the multi-carrier cell. In a multi-frequency cell configured with MBSFN time slots, the RNC of UTRAN sends the configured MBSFN time slots, Non-MBSFN time slots, and MBMS channel information to the entire multi-frequency cell through system broadcast messages or other high-level signaling. Frequency cell:

The specific implementation method of sending configuration information through system broadcast messages:

1) In the system broadcast message, such as: system broadcast message 3 (abbreviated as SIB3), a new information element is configured to notify the UE that the cell supports the MBSFN mode, that is, the downlink time slot of the cell is configured with one or more MBSFN time slot.

2) When the cell is configured with MBSFN time slots, in the system broadcast message, such as: system broadcast message 5, configure a new information element to inform the UE which time slots in the cell are MBSFN time slots, and each MBSFN time slot Relevant information, including: time slot number, that is: specify which downlink time slot the MBSFN is; frequency point information, that is, which carrier carries MBMS services; and cell parameters ID (Cell parameters ID, a cell parameter ID corresponds to a midamble (middle) code, four scrambling codes).

The specific implementation method of sending configuration information through other high-level signaling

The RNC (Radio Network Controller) of UTRAN can also notify UE through high-level signaling, such as: RRC (Radio Resource Control) message, or control information carried on MCCH, whether the cell is configured with MBSFN time slots, and these MBSFN Relevant information of the time slot, that is, the number of the time slot mentioned above, etc.

When the RNC of UTRAN configures MBMS-related channels, it needs to indicate which time slot or time slots these channels are configured on, but does not need to indicate which frequency point (carrier) these channels are configured on, because when these channels are configured in Non-MBSFN time slots , its frequency point must be the main frequency point. When these channels are configured in MBSFN time slots, their frequency points have been determined by the previous configuration of MBSFN time slots.

In the third step, UEs interested in mobile TV or other MBMS services in the cell can receive MBMS services (including mobile TV services) in these MBSFN time slots and Non-MBSFN time slots.

1) UE can know the configuration information of MCCH and/or MICH by receiving system broadcast messages or other RRC messages;

2) Then, on the main carrier of the Non-MBSFN time slot, the MCCH and/or MICH channel can be received;

3) The UE also determines where to receive the interested MBMS service through the MTCH information configured on the MCCH; if the UE is interested in a certain/certain MBMS service (such as: mobile TV), and this/these services are carried on the MBSFN On the time slot, the UE reads the MTCH information according to the known cell parameterID and frequency point (may be the main carrier or a certain secondary carrier), and can improve the receiving gain through multipath combining; if this/ These services are carried on the Non-MBSFN time slot, so the UE must receive the MTCH information on the primary carrier.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (5)

1. the method in multi-carrier district realization enhancing MBMS business is characterized in that, comprising:

A, at multi-carrier district, descending time slot is divided into MBSFN time slot and Non-MBSFN time slot; That part of MBMS business configuration that each sub-district is identical is to the MBSFN time slot; With the distinctive that part of MBMS business configuration in each sub-district to the Non-MBSFN time slot;

B, configuration information is sent to user terminal in the whole multi-carrier district;

C, user terminal receive the MBMS business according to configuration information;

Wherein, that part of MBMS business configuration that each sub-district is identical specifically comprises to the MBSFN time slot described in the step a: that part of MBMS traffic channel configuration that each sub-district is identical is on the main carrier or certain auxilliary carrier wave of one or more MBSFN time slots; The same MBMS Traffic Channel of each cell configuration to the MBSFN time slot should with the same carrier wave in other sub-district; Described the distinctive that part of MBMS business configuration in each sub-district is specifically comprised to the Non-MBSFN time slot: with the distinctive that part of MBMS traffic channel configuration in MBMS control channel, MBMS indicating channel and sub-district to the main carrier of one or more Non-MBSFN time slots;

The transmitting power of all carrier waves of described one or more Non-MBSFN time slots all focuses on the main carrier launches;

The transmitting power of all carrier waves of described one or more MBSFN time slots all focuses on the carrier wave launches;

Described step b specifically comprises: with the MBSFN time slot, the Non-MBSFN time slot that configure, and the information of MBMS channel sends to the user terminal in the whole multi-carrier district to radio network controller by system broadcast message; Comprise that specifically radio network controller disposes new information unit in system broadcast message, which descending time slot informing user terminal MBSFN time slot is, carrying MBMS business and this cell parameter sign on which carrier wave.

2. method according to claim 1 is characterized in that, among the described step a:

Only dispose a MBMS control channel and a MBMS indicating channel at each multi-carrier district, dispose one or more MBMS Traffic Channel.

3. method according to claim 1, it is characterized in that, among the described step b, with the MBSFN time slot, the Non-MBSFN time slot that configure, and the information of MBMS channel sends to the user terminal in the whole multi-carrier district to radio network controller by high-level signaling.

4. method according to claim 3, it is characterized in that, among the described step b, the control information of radio network controller by carrying on radio resource control information or the MBMS control channel, whether this sub-district of informing user terminal has disposed the MBSFN time slot, and these MBSFN time slots are which descending time slot, professional and this cell parameter sign of carrying MBMS on which carrier wave.

5. method according to claim 1 is characterized in that, described step c is specially:

User terminal receives MBMS control channel and/or MBMS indicating channel according to the configuration information of MBMS control channel and/or MBMS indicating channel at the main carrier of Non-MBSFN time slot;

When user terminal will receive the MBMS that is carried on the MBSFN time slot when professional, read the information of MBMS Traffic Channel according to configuration information, and merge by multipath and to improve receiving gain; When user terminal will receive the MBMS business that is carried on the Non-MBSFN time slot, then on main carrier, receive the information of MBMS Traffic Channel.

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