WO2007104231A1

WO2007104231A1 - A multimedia broadcast/multicast service communication method, network and apparatus

Info

Publication number: WO2007104231A1
Application number: PCT/CN2007/000658
Authority: WO
Inventors: Sheng Liu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-03-10
Filing date: 2007-03-01
Publication date: 2007-09-20
Also published as: CN101034921A; CN101034921B

Abstract

A multimedia broadcast/multicast service communication method, wireless network controller, user equipment, base station and wireless network are provided for improving the transmission performance. The method comprises: A, in a same transmission time interval, there are at least two versions of gain redundant information bit in the broadcast/multicast service signal transmitted from all neighbouring cells; B, the user equipment soft combines the received signal according to the redundancy version information of each neighbouring cell, for combines decoding input sequence; C, the user equipment decodes the aforesaid decoding input sequence for receiving the signal. The wireless network controller comprises Redundancy Version Control Function unit, RRC Message Creation unit and RRC Message Sending unit. The user equipment comprises Redundancy Version Obtaining unit and Soft Combining unit and Decoding unit. The base station comprises Redundant Information Creation unit and Signal Transmitting unit.

Description

Method, network and device for transmitting multimedia broadcast and multicast service

The present invention relates to the field of wireless networks, and in particular, to a method for transmitting multimedia broadcast and multicast services, a wireless network controller, a user equipment, a base station, and a wireless network. Background technique

Among various mobile packet services, services including video on demand, television broadcasting, video conferencing, online education, and interactive games have one main feature, that is, multiple users subscribing to the service receive the same data at the same time, and the service and Compared with general data, it often has many concurrent users, large amount of data, long duration, and sensitive time delay. Obviously, if such services still use the common point-to-point transmission method, it is very inefficient for resource-intensive mobile communication networks. to this end,

3GPP (Third Generation Partnership Project) introduced MBMS (Multimedia Broadcast Multicast Service) technology in Release 6 for the transmission requirements of this type of broadcast and multicast services. In MBMS technology, a data source can simultaneously transmit point-to-multipoint data to multiple users and effectively share network resources, including mobile core network and access network resource sharing, especially air interface resources.

Due to the large data traffic and long duration of the MBMS service, the UMTS (Universal Mobile Telecommunication System) network introduces a new logical channel supporting point-to-multipoint transmission for the MBMS service, in order to save air interface resources. MTCH (MBMS Point-to-multipoint Traffic Channel), MCCH (MBMS Point-to-multipoint Control Channel), and MSCH (MBMS Point-to-multipoint Scheduling Channel) , MBMS point-to-multipoint control scheduling channel), respectively for carrying MBMS service data, control information, and MBMS service transmission scheduling information.

According to the 3GPP specification "TS25.346, Introduction of the MBMS in the Radio Access Network (RAN), V6.7.0, 2005-12", the transmission channels of the above three logical channels are FACH (Forward Access Channel), and FACH is transmitted on the downlink common channel S-CCPCH (Second Common Control Physical Channel). As shown in FIG. 1 , the S-CCPCH includes a TFCI (Transport Format Combination Indicator), a data, and a dedicated pilot. The TFCI is used to indicate the S-CCPCH. Information such as the transport format of the transmitted transport block.

For the UMTS system, each downlink physical channel is first spread by a spreading code (channelization code) orthogonal to each other, and then scrambled by a cell-specific downlink complex scrambling code. At the receiving end, the downlink physical channel of the same cell is mainly distinguished by a spreading code. The multipath component of the same physical channel is separated by a downlink scrambling code, and the downlink physical channel of the adjacent different cell is duplicated by the downlink. The scrambling codes are different, so even if the spreading codes are the same, they can be distinguished.

Since multiple users in the MBMS receive the same data at the same time, a user equipment (UE) that receives the MBMS service can receive not only the S-CCPCH channel carrying the MBMS service of the local cell but also the S carrying the MBMS service of the neighboring cell. -CCPCH channel, according to the 3GPP specification TS25.346, MBMS point-to-multipoint transmission supports both soft combining and selective combining.

Among the diversity techniques of wireless communication, maximum ratio combining and selective combining are two typical diversity receiving techniques. If there are multiple receive branches in a receiver system, in order to combine the signals of these receive branches for better reception performance, the maximum diversity combining and selective combining are usually adopted. The selective combining may select one branch with the largest signal-to-noise ratio as the output from the plurality of receiving branches of the receiver system, or may perform the receiving processing on each receiving branch separately, and select the one with the highest receiving quality. The branch is used as the output; as a typical soft combining technique, the maximum ratio combining is to weight each receiving branch signal before combining the receiving branches, and the weighting coefficient is proportional to the receiving signal noise of each branch. ratio. Among the two diversity receiving modes, the maximum ratio combining mode has better performance than the selective combining mode.

In the MBMS system, the selective combining mode is applicable to the case where each cell is not synchronized, and the UE will receive the MTCH of the neighboring cell with the same or similar MBMS radio bearer bit rate, due to The radio link control (RLC) layer of the MTCH adopts the UM (Unacknowledged Mode) mode, so the UE can use the sequence numbers of the RLC PDUs (Protocol Data Units) to align the RLC PDUs of the MTCHs received from different cells, and select each of the sequence numbers. The correct PDU is transmitted, and finally the RLC PDUo of the MTCH with improved reception quality is formed.

For the FDD (Frequency Division Duplexing) system, the soft combining mode is applicable to the synchronization of each cell. At this time, each cell synchronously transmits an S-CCPCH channel carrying the same MBMS service data, and the signals of each cell arrive at the UE. The time difference is mainly caused by the path difference of each cell signal to the UE. The time difference is not too large for the neighboring cell. Therefore, as long as the signal of the neighboring cell is within the multipath receiving window of the RAKE receiver of the UE, the UE can The received signal maximum ratios on the S-CCPCH channels of the corresponding cells are combined to improve the reception performance of the MBMS service.

For the TDD (Time Division Duplexing) system, since the UE does not support simultaneous macro diversity reception of multi-cell signals, the soft combining method is implemented by "simulcast combining", the essence of the technology. The S-CCPCH channel that carries the MBMS service data of different neighboring cells is received by the UE in different time slots, and the S-CCPCH channel that carries the MBMS service data of all the neighboring cells is received by the UE in the FDD. However, the simulcasting of TDD is essentially the same as the macrodiversity reception of FDD, which is the largest ratio of neighboring cell signals to combined diversity reception.

In order to perform the selective combining mode or the soft combining mode, the UE needs to receive the "MBMS NEIGHBOURING CELL PTM RB INFORMATION" information in the RRC (Radio Resource Control) message, and obtain the corresponding combined receiving and receiving information from the information. Configuration information of the S-CCPCH channel carrying the MBMS service data of the neighboring cell. The UE usually selects an appropriate neighboring cell that participates in selective combining or soft combining in such a manner that the neighboring cells that have obtained the S-CCPCH channel configuration information that carries the MBMS service data of the UE, if the downlink common source from the corresponding neighboring cell If the pilot signal-to-noise ratio (CPICHEc/No) exceeds a certain threshold, it is used as a neighboring cell in selective combining or soft combining.

Currently, in the case of synchronization of adjacent cells (FDD), all neighboring cells are simultaneously transmitted. The S-CCPCH channel carrying the same MBMS service data, that is, the channel-coded data signals sent by all neighboring cells, contain the same system bits and the same redundant information bits. Although the prior art adopts the maximum ratio combining technique to soft combine the signals from the cells to obtain the diversity gain benefit, thereby improving the receiving performance of the user equipment of the cell edge to the MBMS service data, but in the prior art, each cell transmits a signal. The same redundant information bits are used, and the potential coding gain that can be provided by using more redundant information bits is not utilized, and therefore, the optimal transmission performance cannot be achieved. Summary of the invention

Embodiments of the present invention provide a method for transmitting multimedia broadcast and multicast services, a wireless network controller, a user equipment, a base station, and a wireless network, to improve the transmission performance of multimedia broadcast and multicast services.

The method of the embodiment of the present invention is applied to the synchronization of each neighboring cell, and includes the following steps: A. In the same transmission time interval, the broadcast and multicast service signals sent by all neighboring cells include at least two versions of incremental redundancy. The information bits are softly combined according to the redundancy version information of each neighboring cell, to synthesize the decoded input sequence; (:, the user equipment decodes the decoded input sequence to Complete the reception of the signal.

The radio network controller of the embodiment of the present invention is applied to multimedia broadcast and multicast service transmission, and includes:

a redundancy version control function unit, configured to match a corresponding redundancy version for each neighboring cell; an RRC message generating unit, configured to generate an RRC message carrying redundancy version information; and an RRC message sending unit, configured to send an RRC message generation The RRC message generated by the unit.

The user equipment of the embodiment of the present invention is configured to receive multimedia broadcast and multicast service data, including: a redundant version obtaining unit, configured to receive the redundancy version information of the cell from the received RRC message from the cell; a unit, configured to perform soft combining on the received cell signal according to the redundancy version information acquired by the redundancy version acquiring unit, to synthesize a decoding input sequence, and a decoding unit, configured to perform a decoding input sequence output by the soft combining unit Decode to complete the reception of the signal. In the base station of the embodiment of the present invention, the redundancy information generating unit is configured to generate a corresponding version of the incremental redundancy information bit according to the current redundancy version parameter of the coverage cell, and a signal transmitting unit, configured to send the included information to the cell A signal of a corresponding version of the incremental redundant information bits generated by the redundant information generating unit.

The wireless network of the embodiment of the present invention is applied to multimedia broadcast and multicast service transmission, and includes a radio network controller, configured to configure a corresponding redundancy version for each neighboring cell, and carry the redundancy version information in the delivered RC message. a base station, configured to generate, according to a current redundancy version parameter of the coverage cell, a corresponding version of the incremental redundancy information bit, and send, to the cell, a signal that includes a corresponding version of the incremental redundancy information bit; the user equipment, And the cell redundancy version information carried in the received RRC message from the cell, and soft combining the received cell signal according to the redundancy version information, and decoding by using the synthesized decoding input sequence, Signal reception.

In the case that each neighboring cell is synchronized, the signal sent by all neighboring cells does not include the same transmission mode of the same system bit and the same version of redundant information bits, but is in the same transmission time interval. The signals sent by all the neighboring cells include at least two versions of incremental redundant information bits (the system bits are the same); the user equipment soft-combines the received signals according to the redundancy version information of each neighboring cell, to Synthesizing the input sequence; the user equipment decodes the decoded input sequence to complete the reception of the signal. Thus, with respect to the prior art, the potential coding gain that can be provided by more redundant information bits can be utilized, thereby improving the transmission performance of the MBMS service. DRAWINGS

1 is a schematic diagram of a frame structure of an S-CCPCH in the prior art;

2 is a schematic structural diagram of a radio network controller according to an embodiment of the present invention;

3 is a schematic structural diagram of a base station according to an embodiment of the present invention;

4 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

5 is a flow chart of steps of a multimedia broadcast and multicast service transmission method according to an embodiment of the present invention; FIG. 6 is a schematic diagram of generating different redundant information based on Turbo coding in the prior art; 7 is a flowchart of soft combining and decoding in the first embodiment of the method according to the present invention;

FIG. 8 is a flowchart of soft combining and decoding in Embodiment 2 of the method according to the present invention. detailed description

In order to improve the transmission performance of the multimedia broadcast and the multicast service, the embodiment of the present invention provides a radio network controller RC having the function of the existing RNC, as shown in FIG. 2, which further includes: a redundancy version control function unit And an RRC message generating unit and an RRC message sending unit.

The redundancy version control function unit is configured to send, by the base station Node B application part NBAP and/or the wireless subsystem application part RNSAP, the redundancy version parameter to each cell of the point-to-multipoint multimedia broadcast and multicast service, to The signal sent by each neighboring cell is included in the signal of the corresponding version.

The RRC message generating unit is configured to obtain redundancy version information from the redundancy version control function unit to generate an R C message carrying the redundancy version information.

The R C message sending unit is configured to send an RRC message generated by the RRC message generating unit. The embodiment of the present invention further provides a base station, configured to transmit multimedia broadcast and multicast service data, as shown in FIG. 3, including: a redundant information generating unit and a signal transmitting unit.

The redundancy information generating unit is configured to generate a corresponding version of the incremental redundancy information bits according to the current redundancy version parameter of the coverage cell. The redundant information generating unit generates a corresponding version of the incremental redundant information bits in a manner of turbo coding and then cascading rate matching.

The signal transmitting unit is configured to send, to the cell, a signal that includes a corresponding version of incremental redundant information bits generated by the redundant information generating unit.

The embodiment of the present invention further provides a user equipment, which has the function of an existing user equipment. As shown in FIG. 4, the method further includes: a redundancy version obtaining unit, a soft combining unit, and a decoding unit.

The redundancy version obtaining unit is configured to use the cell redundancy version information carried in the received RRC message from the cell.

The soft combining unit is configured to perform soft combining on the received cell signal according to the redundancy version information acquired by the redundancy version acquiring unit to synthesize the decoding input sequence. The decoding unit is configured to decode the decoded input sequence output by the soft combining unit to complete the reception of the signal.

The wireless network in the embodiment of the present invention is applied to the multimedia broadcast and the multicast service transmission, and includes: a radio network controller, configured to configure a corresponding redundancy version for each neighboring cell, and carry the redundancy version in the delivered RRC message. Information

The base station is configured to generate a corresponding version of the incremental redundancy information bits according to the current redundancy version parameter of the coverage cell, and send a signal containing the corresponding version of the incremental redundancy information bits to the cell.

a user equipment, configured to receive the cell redundancy version information from the received RRC message from the cell, perform soft combining on the received cell signal according to the redundancy version information, and perform a combined decoding input sequence. Decoding, complete signal reception.

The embodiment of the present invention provides a method for transmitting multimedia broadcast and multicast services, as shown in FIG. 5, including the following main steps:

51. The RNC configures a redundancy version for each neighboring cell.

52. The cell transmits a signal.

53. The user equipment determines a neighboring cell.

54. The user equipment receives the signal and performs soft combining to synthesize the decoded input sequence.

55. Decode the synthesized decoded input sequence.

The present invention will be specifically described below by means of two embodiments.

Method Embodiment 1: The redundancy versions of each neighboring cell are different.

5101. The RNC configures a redundancy version for each cell.

The RC of the embodiment of the present invention configures a redundancy version for each cell controlled by the redundancy version control function unit, and adopts NBAP (Node B Application Part, Node B application part) and/or RNSAP (Radio Network Subsystem Application Part). , the wireless subsystem application part) sends a redundancy version (RV, Redundancy Version) parameter to each corresponding cell.

5102. The cell transmits a signal.

Referring to Table 1, the RRC message generating unit controls each functional unit according to the redundancy version. The redundancy version information of the area configuration adds an information element (IE, Information Element) for indicating a redundancy version adopted by the corresponding cell in the generated RRC message; further preferably, the RRC message "MBMS NEIGHBOURING CELL PTM RB" In INFORMATION", an information element for indicating a redundancy version adopted by the corresponding cell is added. Specifically, the IE "RV Configuration" is added to the IE "Neighbouring cell's S-CCPCH list". For example, the value range of the IE is an integer ranging from 0 to 7, which is used to indicate the redundancy version adopted by the corresponding cell. Thereafter, the RRC message transmitting unit transmits the RRC message generated by the RC message generating unit to the base station to which each cell belongs.

Information Need Multi Type and Semantics description Version Element Group name reference

Information configuration

Information

10.3.9a.16

»Different REL-6

»>TrCh information for MD MBMS Refers to a (TFCS) REL-6 common for all TrCh Common configuration in the common

CCTrCh RB info

Identity The default value of the TFCS

10.3.9a.1 is specified in subclause

14.10.1

>»TrCH information list MP 1 to List of FACH transport REL-6

<maxFA channels carrying one or more

CHPCH MTCH and ironing one

> MSCH

»»TrCh information MP V3»· - MBMS Refers to a (TFS) configuration REL-6

Common in the common RB info

TrCh identity

10.3.9a, 4

»»TrCh s MP BOOLEAN Value TRUE means that TrCh REL-6 status integration is used for this

Transport channel (TDD only).

Note 2.

»»RB information list OP The IE is only present for the REL-6

Radio bearers for which

Selection (FDD) or transport

Channel (TDD) combining

Applies.

»»i>RB information MP MBMS p-i-m REL-6

B

Information

10.3.9a Ja

»»MSCH configuration OP SCH Included if the TrCH carries REL-6 information configuration MSCH

Information

10.3.9a.16 After the base station forwards the RRC message to each user equipment by cell broadcast, the MTCH carrying the point-to-multipoint MBMS service is transmitted on the FACH transmission channel. Currently, the FACH channel supports channel coding using Turbo coding. Therefore, in the existing FACH channel coding and multiplexing process, a functional unit for generating a designated redundancy version signal is required to generate coded data bits of respective redundant versions of respective cells.

The base station of the embodiment of the present invention uses its built-in redundant information generating unit according to the current redundancy version of the cell it covers (configured by the above-mentioned redundancy version control function unit), and uses turbo coding after cascading rate matching (punching) ), generating the corresponding version of the incremental redundancy information bits.

The generation process of different versions of redundant information based on Turbo coding is shown in Figure 6. The turbo code rate is 1/3. The convolutional encoder 1, convolutional encoder 2 and internal interleaver form the main structure of Turbo code. If the input data stream is ⁼ , ^, '"1⁄2), the output packet of the Turbo encoder Including the system code stream ⁼ ( ^Χ 1, ^Χ 2' ··· ) , 0, redundant information stream ^ , ^,...^), =03⁄4, 22, ··· 1⁄2), ^Ζ 2 =(3⁄4, 3⁄4,··· ), ^Z l =(1⁄2,1⁄2,····1⁄2,), select different bits in these output streams by the puncturing unit, and generate coded blocks with different redundant information bits as needed. . For example, the need to set the transmission ^{^{^{^{signal, λ '2, Χ3, Χ4}}}} , Χ 5' ^, then the first cell transmission ^{= (X l,, Jl3,} , ', ½), the second cell transmission 2 = ( x _] , 3⁄4' ^X 3'23' ^X ^ ^X 5^ ^X 6^ ^Z 26) ^ It can be seen that although the code rate transmitted by both cells is 3/4, the redundant information transmitted is different.

In the embodiment of the present invention, in the same transmission time interval (TTI, Transmission Time Interval), the point-to-multipoint broadcast and multicast service data coding block (signal) transmitted by different neighboring cells includes the same system bit. It also contains incremental redundancy information bits of different versions.

In the embodiment of the present invention, the point-to-multipoint broadcast and multicast service data coding block (signal) transmitted by each neighboring cell may have the same length of incremental redundancy information bits (ie, adjacent to each other). The code rate of the point-to-multipoint broadcast and multicast service data coding block sent by the cell is the same), or may be different (that is, the code of the point-to-multipoint broadcast and multicast service data coding block sent by each neighboring cell) The rate is different).

5103. The user equipment determines a neighboring cell, and obtains a redundancy version of the neighboring cell.

The user equipment in the embodiment of the present invention needs to identify the information unit indicating the redundancy version used by the corresponding cell in the relevant RRC message, and obtain the neighboring cell required for the corresponding combined reception from the information unit. The configuration information of the S-CCPCH channel carrying the MBMS service data; preferably, the RRC message is "MBMS NEIGHBOURING CELL PTM RB INFORMATION" information. If the signal to noise ratio of the downlink common pilot of the relevant cell exceeds a preset threshold, it is determined that the cell is a neighboring cell.

5104. The user equipment receives the signal and performs soft combining to synthesize the decoded input sequence.

The user equipment may only receive a downlink common channel carrying the point-to-multipoint broadcast and multicast service data of one cell in the neighboring cell (such as the most powerful pilot cell), and independently decode the same; or may receive multiple or The downlink common channel of all neighboring cells carrying the point-to-multipoint broadcast and multicast service data. Referring to Figure 7, the soft combining unit in the user equipment performs soft combining using the following strategy to synthesize the decoded input sequence.

Since the redundancy versions of the neighboring cells are different in this example, the user equipment first performs multipath reception processing on the received signals of the respective cells, where the multipath reception processing may use a RAKE receiver, An LMMSE (Linear Minimum Mean Square Error) equalizer may be employed. When two or more receiving branches are used for diversity reception, the multipath receiving process further includes separately transmitting signals of the same cell of each receiving branch. Performing a step of performing maximum ratio combining after multipath reception; then demodulating signals of each cell output by the multipath receiving process to obtain a system bit and an incremental redundancy information bit in each cell signal, and determining the value The value can be either in the form of a hard decision or a soft decision. When a soft decision is used, a log likelihood ratio (LLR) can be typically used. Second, the system bits in the signals of the cells are Determining the decision value of the incremental redundant information bits; thereafter, combining the decision values of the systematic bits in each cell signal, where When the soft decision value in the form of a log-likelihood ratio (LLR) is used, the combining operation of the systematic bits may be a method of directly adding soft decision values of system bits of each cell; finally, according to step S103. The redundancy version information of each cell combines the decision value of the incremental redundancy information bits in the signals of each cell and the decision value of the combined system bits into one decoding input sequence.

S105. Decode the synthesized decoded input sequence.

Decoding the synthesized decoded input sequence, since different incremental redundant information bits in each cell signal are utilized, the coding rate of the synthesized decoded input sequence is reduced, so that a higher coding gain can be obtained, thereby improving the MBMS service. Receive performance.

Method Example 2: The version of the incremental redundancy information bits contained in the signals sent by each neighboring cell is the same, and the rest are different.

5201. The RNC configures a redundancy version for each cell. (same as step S101)

5202, the cell transmits a signal.

The process of generating corresponding versions of redundant information bits by each cell is the same as that of the method example 1.

In the embodiment of the present invention, in the same transmission time interval (TTI, Transmission Time Interval), the point-to-multipoint broadcast and multicast service data coding block (signal) transmitted by the neighboring cell includes the phase The same system bits also contain incremental redundancy information bits with the same version and different versions.

S203. The user equipment determines a neighboring cell, and obtains a redundancy version of the neighboring cell. (same as step S103)

S204. The user equipment receives the signal and performs soft combining to synthesize the decoded input sequence.

The user equipment may only receive a downlink common channel carrying the point-to-multipoint broadcast and multicast service data of one cell in the neighboring cell (such as the most powerful pilot cell), and independently decode the data; or may receive multiple or The downlink common channel of all neighboring cells carrying the point-to-multipoint broadcast and multicast service data.

Referring to Figure 8, the soft combining unit in the user equipment performs soft combining using the following strategy to synthesize the decoded input sequence.

Since the versions of the incremental redundancy information bits included in the signals sent by the neighboring cells in this example are the same, and the rest are different, the user equipment first performs multipath reception processing on the signals of the received cells, where The multipath receiving process may be a RAKE receiver or an LMMSE (Linear Minimum Mean Square Error) equalizer. When two or more receiving branches are used for diversity reception, the multipath receiving process is performed. The method further includes the steps of performing maximum ratio combining after the signals of the same cell of each receiving branch are respectively subjected to multipath reception; secondly, performing maximum ratio combining on the signals with the same redundancy version after multipath receiving processing; The redundant version of the signal is demodulated to obtain the decision values of the systematic bits and the incremental redundant information bits in the signals of the different redundancy versions, and the decision value may be in the form of a hard decision or a soft decision. Form, when soft decision is used, a log-likelihood ratio (LLR) form can usually be used, after which the signals are divided Systems for decision values of information bits and redundant bits separated; after having different redundancy The decision values of the systematic bits in the remaining versions of the signal are combined, where the log likelihood ratio is used

In the case of a soft decision value in the form of (LLR), the combining operation of the systematic bits may adopt a manner of directly adding soft decision values of system bits of each cell; the signals of the different redundancy versions include: The signals with the same redundancy version are subjected to the maximum ratio combining signal, and the signals received by the user equipment include signals of different redundancy versions. Finally, the redundancy version information of each cell learned in step S203 is incrementally redundant. The decision value of the remaining information bits and the decision value of the combined systematic bits are combined into one decoded input sequence.

S205. Decode the synthesized decoded input sequence. (same as step S105)

In summary, the embodiments in which the redundancy versions of the neighboring cells are different, and the versions of the incremental redundancy information bits included in the signals sent by the neighboring cells are the same, and the remaining parts are different embodiments. The use of different incremental redundant information bits in each cell signal reduces the coding rate of the synthesized decoded input sequence, so that a higher coding gain can be obtained, thereby improving the reception performance of the MBMS service.

Although the embodiment of the present invention is described with respect to the MBMS service of the 3GPP, the transmission scheme for the point-to-multipoint transmission of the multicast and/or broadcast service proposed by the embodiment of the present invention is also applicable to other groups. Broadcast and/or broadcast systems, such as the BCMCS (Broadcast and Multicast Service) system in 3GPP2.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

A method for transmitting multimedia broadcast and multicast services, which is applied to synchronization of neighboring cells, and is characterized in that it comprises the following steps:

A. At the same transmission time interval, broadcast and multicast service signals sent by all neighboring cells include at least two versions of incremental redundancy information bits;

B. The user equipment soft combines the received signals according to the redundancy version information of each neighboring cell to synthesize the decoded input sequence.

C. The user equipment decodes the decoding input sequence to complete reception of the signal.

2. The method according to claim 1, wherein in the step A, the versions of the incremental redundancy information bits included in the signals sent by the neighboring cells are different.

The method according to claim 2, wherein the step B includes the following steps: B11: The user equipment performs multipath reception processing on the received signals of the cells;

B12. Demodulate signals of each cell output by the multipath receiving process to obtain a system bit and an incremental redundancy information bit in each cell signal.

B13. Separating the system bits in the signals of the cells and the decision values of the incremental redundancy information bits.

B14. Combine the decision values of system bits in each cell signal.

B15. Synthesize the decision value of the incremental redundancy information bit and the decision value of the combined system bit in the signal of each cell according to the redundant version information of each neighboring cell acquired in the message sent from the network side. A decoding input sequence.

The method according to claim 3, wherein, in the step B11, if at least two receiving branches are used for diversity reception, the multipath receiving process further includes: combining the same of each receiving branch The signals of the cell are subjected to maximum ratio combining after multipath reception, respectively.

The method according to claim 3, wherein in the step B12, the decision value is obtained in the form of a log likelihood ratio LLR.

The method according to claim 5, wherein in step B14, the decision values of the system bits are combined by directly adding the decision values of the systematic bits of the cells.

The method according to claim 1, wherein in the step A, the versions of the incremental redundancy information bits included in the signals sent by the neighboring cells are the same.

The method according to claim 7, wherein the step B includes the following steps: B21: The user equipment performs multipath receiving processing on the received signals of each cell;

B22. Perform maximum ratio combining on signals with the same redundancy version after multipath reception processing; B23, demodulate signals of different redundancy versions to obtain system bits and incremental redundancy in signals of different redundancy versions. The decision value of the remaining information bits;

B24. Separating the decision bits of the systematic bit and the incremental redundant information bits for the signals of different redundancy versions respectively;

B25. Combine the decision values of the system bits in the signals with different redundancy versions; B26, and each incremental redundancy information according to the redundancy version information of each neighboring cell obtained from the message sent from the network side. The decision value of the bit and the decision value of the combined systematic bits are combined into one decoded input sequence.

The method according to claim 8, wherein the signals of the different redundancy versions described in step B23 comprise: the signal outputted after the maximum ratio combining of the signals having the same redundancy version in step B22, And signals of different redundancy versions in the received cell signals.

The method according to any one of claims 1 to 9, wherein in step A, the version of the incremental redundant information bits included in the broadcast and multicast service signals sent by the neighboring cell is determined by the network. The side is configured for each neighboring cell.

The method according to claim 10, wherein after the network side configures a redundant bit version for each neighboring cell, the RRC message sent to the user equipment is added to indicate that the corresponding cell is used. A redundant version of the information element to inform the user of the redundancy version information required for the device to perform soft combining.

The method according to any one of claims 1 to 9, wherein each of the neighboring cells is determined by the following steps:

If the signal to noise ratio of the downlink common pilot of the relevant cell exceeds a preset threshold, it is determined that the cell is a neighboring cell.

13. A radio network controller for multimedia broadcast and multicast service transmission, comprising:

14. The radio network controller according to claim 13, wherein the redundancy version control function unit matches each neighboring cell by a base station Node B application part BAP and/or a radio subsystem application part R SAP. Redundancy version parameters.

15. A user equipment, configured to receive multimedia broadcast and multicast service data, and the method includes:

a redundancy version obtaining unit, configured to receive the cell redundancy version information from the received RRC message from the cell;

a soft combining unit, configured to perform soft combining on the received cell signal according to the redundancy version information acquired by the redundancy version acquiring unit, to synthesize the decoding input sequence;

And a decoding unit, configured to decode the decoded input sequence output by the soft combining unit to complete the receiving of the signal.

A base station, configured to transmit multimedia broadcast and multicast service data, and is characterized by:

And a redundancy information generating unit, configured to generate, according to a current redundancy version parameter of the coverage cell, a corresponding version of the incremental redundancy information bit;

And a signal transmitting unit, configured to send, to the cell, a signal including an incremental redundancy information bit of a corresponding version generated by the redundant information generating unit.

17. The base station according to claim 16, wherein the redundant information generating unit

18. A wireless network, applied to multimedia broadcast and multicast service transmission, characterized in that:

a radio network controller, configured to configure a corresponding redundancy version for each neighboring cell, and under The sent RRC message carries redundancy version information;

And a base station, configured to generate, according to a current redundancy version parameter of the coverage cell, a corresponding version of the incremental redundant information bits, and send, to the cell, a signal that includes a corresponding version of the incremental redundancy information bits;