CN1219372C - Transmission method for implementing multimedia broadcast and multicast service - Google Patents
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Abstract
Description
Technical field
The present invention relates to the wireless communication technique field, relate in particular to the transmission method of the MBMS in digit wireless communication system.
Background technology
At 3G (Third Generation) Moblie Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code DivisionMultiple Access) in the system, the Channel Transmission time interval among the WCDMA (TTI:TransmissionTime Interval) generally all is 10ms, and each TTI contains 15 time slots (slot).In order to adapt to high-speed data service, be fit to the transmission of needed quick response of high speed data transfer and big data quantity, introduced high speed descending sharing channel (HS-DSCH:High Speed Downlink Share Channel), this channel for the time demal divide shared channel, every 2ms is a TTI, and each TTI contains 3slot.
Follow the HS-DSCH channel, descending High-Speed Shared Control Channel (HS-SCCH:HighSpeed Share Control Channel) is arranged, be used for indicating whether to receive the decoded data that certain HS-DSCH goes up certain TTI to user (UE:User).After UE receives decoding, receive the affirmation of the correctness of decoded data block/deny that information (ACK/NACK:Acknowledge/Unacknowledge) and channel quality indication (CQI:Channel QualityIndicator) are to the base station by up High-Speed Dedicated Physical Control Channel (HS-DPCCH:High Speed Dedicate Physical Control Channel) feedback.Quality of channel is judged according to CQI, modulation and parameters such as coded system and power that decision sends according to the data block that ACK/NACK determines whether to want retransmits erroneous in the base station.In the transmission of supporting point-to-point, each UE passes through HS-DPCCH channel feedback ACK/NACK and its CQI information of user separately, and the base station retransmits and adjust modulating-coding rank (MCS:Modulation and Coding Selections) according to the ACK/NACK and the CQI of each UE feedback.
Referring to shown in Figure 1, Fig. 1 is the channel architecture of HS-SCCH.This channel architecture comprises first (Part1), second portion (Part2) and cyclic redundancy check (CRC) code (CRC) part, wherein, Part1 part and Part2 part are calculated by CRC and are obtained the CRC sign indicating number, and the encoded packets of the user ID of 10bit (UE ID) is contained in the calculating of CRC.Part1 partly comprises 8bit, 7bit is a modulation intelligence for information, the 1bit that the channel code collection distributes, Part2 partly comprises 13bit, be respectively the indication transmission block size of 6bit, the hybrid arq information (HARQ:Hybrid ARQ) of 3bit, the redundant information of 3bit, the new transmission block indication information of 1bit, the CRC sign indicating number is 16bit.Part1, Part2, CRC are 1/2 convolution coding (8 tail bits), code check coupling through code check and interweave and become 120bit that form 3 slot, every slot is 40bit respectively.
The information via code check of above-mentioned Part1 is 1/2 convolution coding (8 tail bits), code check coupling and interweaves, with scrambling Part1 information, its implementation procedure is such: as shown in Figure 2, the base station is 1/2 convolution coder coding and code check adaptation coupling with the information via code check of Part1 part in the HS-SCCH channel, forms the Part1 information of 40bit; Simultaneously, the user ID of 10bit is carried out block encoding, form the sign indicating number sequence of 32bit, repeat first 8bit of this yard sequence, form the scramble sequence of 40bit, then the scramble sequence of 40bit and the Part1 information partly of 40bit are carried out XOR, form first slot, the information of Part1 so that the recipient in time decodes, obtain information and modulation intelligence that the corresponding sign indicating number collection of UE ID distributes, judge thus on the main MBMS down channel whether the information of passing to oneself is arranged,, just receive decoding if having.
Development along with mobile communication technology, the mobile service of multimedization more and more receives an acclaim, present base station yet (NodeB) and radio network controller (RNC:Radio Network Controller) structure only is fit to the high-speed data service of point-to-point, do not consider the air interface demand of MBMS (MBMS:Multimedia Broadcast and Multicast Service), such as: reduce wireless communication channel and take resource, carry out high speed data transfers or the like problem.The information scrambling processing procedure of Part1 also as can be seen from Fig. 2, in the present mobile radio system, HS-SCCH generates scrambler sequence with user ID, and therefore the basic service of supporting all is a point-to-point, just from a user side to another user side, can not support multicast.
On the other hand, broadcast channel (BCH:Broadcast Channel) or each user's dedicated channel is generally adopted in the transmission of present MBMS.Though in the WCDMA system, broadcast channel is arranged, but what transmit on this broadcast channel is random access code and access slot available in the sub-district, and the diversity mode that uses etc., be used for the registration of UE in the sub-district, speed has only about 30kbps, can not be used for the high multimedia broadcasting of transmission rate request; And utilize dedicated channel transmitting multimedia broadcast and multicast service, then the dedicated channel each user transmits identical information, has wasted Radio Resource.
Summary of the invention
The object of the present invention is to provide a kind of transmission method of MBMS, on the basis of existing high speed descending sharing channel structure, realize the transmission of MBMS,, reduce and occupy resource to improve transmission rate.
The present invention is achieved through the following technical solutions:
A kind of transmission method of realizing MBMS is applied in the wireless telecommunication system, and this method comprises at least:
A. radio network controller identifies (Group ID) according to the required type of service of user of registration MBMS for each user distributes cohort separately, forms the cohort user;
B. the base station generates cohort sign scramble sequence according to the cohort sign, and with this cohort sign scramble sequence first's information of MBMS control channel is carried out scrambling and handle, and forms first gap information of this channel;
C. base station assigns MBMS down channel, and issue packet to the cohort user by this channel;
D. the cohort user is according to first gap information of MBMS control channel, whether MBMS down channel on have the information of passing to oneself, if having then receive the packet that current MBMS down channel issues if judging.
Said method can further comprise, the MBMS of user's registration is deposited in Home Location Register (HLR:Home Location Register), and at corresponding this user's of MBMS server record unique identification, form user's authentication foundation, MBMS administrative center (MBMSMC:MBMS Manage Center) produces the service identification (MBMS ID) of this business, and mobile switching centre sets up air-link resources according to user's authentication foundation and service identification by the request of radio network controller and base station.Wherein, described user ID is IMSI International Mobile Subscriber Identity (IMSI:International Mobile Subscriber Identity), and described MBMS server is virtual supplementary data services device (VAS:VirtualApplication Service).
Said method also can further comprise,
E. after the cohort user receives the packet that current MBMS down channel issues, give the base station by the reception information of up MBMS feedback channel feedback current data packet; If do not pass to the information of oneself, then do not carry out any processing, wait for receiving the packet that issue next time;
F. the base station receives correct according to step e institute feedback data bag or error message is handled the misdata bag.
Wherein, the MBMS down channel described in the step C is a main MBMS down channel; Perhaps described MBMS down channel is a pair of main MBMS down channel, auxilliary MBMS down channel.Described cohort sign can be handed down to the user of registration MBMS by the broadcast channel in the system, forms broadcast traffic transmissions.Described cohort sign can be by the registration MBMS the user separately dedicated channel issue, form the multicast service transmission.
Further, described steps A further comprises, the user of registration MBMS is by reporting the channel quality of current received signal to the measurement of base station pilot to radio network controller, and radio network controller divides into groups according to the user of channel quality to the registration MBMS.
Described step B comprises,
B01) first's information via code check of MBMS control channel is 1/2 convolution coder coding and code check adaptation coupling, forms first's information of 40 bits;
B02) the block encoding cohort identifies, and forms the sign indicating number sequence of 32 bits, repeats first 8 bit of this yard sequence, forms the cohort sign scramble sequence of 40 bits;
B03) the cohort sign scramble sequence of 40 bits and first's information of 40 bits are carried out XOR, form first gap information of MBMS control channel.
Described step F further comprises the processing of misdata bag, if the base station receives the information that the packet error of any one cohort user feedback receives, then retransmit the packet of losing separately to all cohort users at main MBMS down channel.If the base station receives the information that the packet error of one or more cohort user feedbacks receives, then the correct cohort user who receives of feedback data packet monitors main MBMS control channel, and receives the new data packets that passes under the main MBMS down channel; The cohort user that the feedback data packet mistake receives information monitors auxilliary MBMS control channel and main MBMS control channel, receive the packet of auxilliary MBMS down channel retransmission of lost, and receive the new data packets that passes under the main MBMS down channel simultaneously.If the user among the cohort user is frequent at the probability of the information of the packet error reception of a period of time internal feedback, then this user is removed in the base station from this cohort user, distributes air-link resources for this user again.For the data that auxilliary down channel is transmitted, the quality that this channel satisfies transmission is given tacit consent in the base station, if the cohort user still can't correctly receive the data that retransmit on this channel, then retransmits by the wireless chain control layer agreement request.
In addition, described cohort is designated 10 bits.
Above-mentioned MBMS control channel can be main MBMS control channel, perhaps can be auxilliary MBMS control channel.
Above-mentioned feedback reception information comprises information, the channel quality indication (CQI) information that the correct information that receives of packet, packet error receive.
The present invention is by using existing common signal channel-high speed descending sharing channel, and by the cohort user ID is set, realized the data broadcasting and the multicast service of two-forty under finite wireless resources, the resource of having saved wireless frequency has improved sub-district use user's capacity; Handle by certain strategy by ACK/NACK and CQI information that the cohort UE that belongs to same GroupID is fed back, improved the treatment effeciency of base station, alleviated the burden of base station, improved the reliability of transmission feedback information; By distributing main MBMS down channel, auxilliary MBMS down channel, when main MBMS down channel quality difference,, and then improved transmission quality with auxilliary MBMS down channel data retransmission, guaranteed that data correctly transmit.
Description of drawings
Fig. 1 is the channel architecture schematic diagram of HS-SCCH;
Fig. 2 is the schematic diagram of Part1 information in the channel architecture of the scramble sequence scrambling HS-SCCH that forms with UE ID in the prior art;
Fig. 3 is the schematic diagram of the present invention with Part1 information in the channel architecture of the scramble sequence scrambling HS-SCCH of Group ID formation;
Fig. 4 is for realizing the schematic diagram of broadcasting and multicast service transport service.
Embodiment
For make purpose of the present invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The MBMS business has the identical information of a plurality of UE transmission in the sub-district simultaneously, and the bigger characteristics of information data amount that transmit, because the BCH channel is not suitable for transmitting the bigger multimedia messages of data volume, and utilize dedicated channel to pass identical information waste resource for each UE.
The present invention is directed to the MBMS business features, utilize existing common signal channel-high speed descending sharing channel to realize MBMS.The present invention is provided with high speed data channels and comprises main MBMS down channel, main MBMS control channel, auxilliary MBMS down channel, auxilliary MBMS control channel and up MBMS feedback channel.
Main MBMS down channel and auxilliary MBMS down channel all are a kind of high speed descending sharing channels, have the identical channel architecture of HS-DSCH among the WCDMA with prior art.The characteristics of main MBMS down channel are short TTI, high order modulation, Turbo code coding and shared channel, can be fit to the data block of transmitting big data quantity, being received decoding and retransmission of lost by a plurality of UE simultaneously.The characteristics of auxilliary MBMS down channel are that modulation and coding exponent number are lower, and transmission rate is lower, to guarantee transmission quality.
The structure of main MBMS control channel and auxilliary MBMS control channel is identical with the HS-SCCH structure of prior art, promptly the HS-SCCH structure with shown in Figure 1 is identical, different is that the UE ID of 10bit is replaced by the cohort sign (Group ID) according to the MBMS of the 10bit of type of service distribution by RNC in the base station scrambling Part1 information process shown in Figure 2.As shown in Figure 3, the information via code check of Part1 part is 1/2 convolution coder coding and code check adaptation coupling, forms the Part1 information of 40bit; Simultaneously, the Group ID of 10bit is carried out block encoding, form the sign indicating number sequence of 32bit, repeat first 8bit of this yard sequence, form the Group ID scramble sequence of 40bit, then the Group ID scramble sequence of 40bit and the Part1 information partly of 40bit are carried out XOR, form first slot.Like this, channel architecture and original WCDMA system channel structure are compatible fully, and cohort UE can be according to the information of main MBMS control channel Part1 part, obtain information and modulation intelligence that the corresponding sign indicating number collection of Group ID distributes, judge thus on the main MBMS down channel whether the information of passing to oneself is arranged, if have, just receive and decoding; Otherwise, do not carry out any processing, wait for receiving the packet that issue next time.
The structure of up MBMS feedback channel is identical with HS-DPCCH channel architecture of the prior art.Different is, for the cohort UE that belongs to same Group ID, each UE can give the base station by separately uplink feedback channel feeding back ACK/NACK and CQI information to the main MBMS down channel of sharing, and this feedback information is handled by certain strategy in the base station.And in point-to-point transmission, each UE gives the base station to each autonomous MBMS down channel by separately uplink feedback channel feeding back ACK/NACK and CQI information, and handle each UE feedack respectively the base station.
The following describes the implementation procedure of MBMS transmission.
For the MBMS business, at first UE will register this business.The professional registration of the MBMS of UE is left in the Home Location Register, as the authentication foundation.Also write down the mobile phone unique identification of registering this MBMS business in the corresponding M BMS server, for example IMSI International Mobile Subscriber Identity.Above-mentioned MBMS server can be various virtual value-added data servers.In one or several mobile switching centre (MSC) zone, there is a MBMS administrative center.When the professional generation of this MBMS, MBMSMC is given in the request of sending of MBMS Business Entity, and MBMSMC and MSC set up and get in touch, and produce the service identification of this MBMS, and MSC is by RNC and the relevant air-link resources of NodeB request foundation.
Initially setting up in the process, the UE of registration MBMS business can report the present quality of channel of RNC by the measurement to the NodeB pilot tone.For the UE in the sub-district (CELL), RNC divides into groups according to the channel quality condition of the current received signal of each UE.Each group all has a MBMS Group ID who is distributed by RNC.
For each MBMS business, MBMSMC sets up contact by MCS and RNC.Though have a plurality of groups in the sub-district, or have a plurality of groups in a plurality of sub-district, each group has different MBMS business, has only the business of unique MBMSID to connect on the Iu interface between RNC and the MSC.
Referring to shown in Figure 4, RNC can set up MBMS group according to MBMS ID, distributing radio resource, and the base station receives after RNC sets up the message of MBMS group, for broadcasting service, then has only a grouping, and each UE can be handed down to MBMS Group ID by BCH in the base station.In other cases, comprise the multicast situation, the base station is handed down to each UE by the dedicated channel signaling of each UE with MBMS Group ID; Each UE receives Group ID confirmation to base station feedback, and the base station is set up confirmation with Radio Resource and fed back to RNC, finishes the process of initially setting up.
In the RNC side, RNC distributes different main MBMS down channels, i.e. the HS-DSCH channel according to the channel situation of each group UE.Organize preferably for channel situation, the main MBMS down channel of distribution has higher modulation system and code efficiency, so that the transfer rate height of data.For the relatively poor group of channel quality, the main MBMS down channel of distribution has lower transfer rate, to guarantee that data can correctly transmit.
After UE receives the packet of main MBMS down channel, Part1 information partly according to main MBMS control channel, obtain information and modulation intelligence that the corresponding sign indicating number collection of Group ID distributes, and judge on the main MBMS down channel according to Group ID whether the information of passing to oneself is arranged, if have, just receive decoding, and decode and CRC check.
For the UE in the group, each UE passes through uplink feedback channel feeding back ACK/NACK and CQI information is given the base station.Different with point-to-point transmission is, in point-to-point transmission, the base station issues new data packets by the main MBMS down channel of each UE to UE, and retransmits with MCS at the ACK/NACK of its main MBMS down channel feedback and CQI according to each UE and to adjust.And in the professional transmission of broadcast or multicast, the base station issues new data packets by a main MBMS down channel to the cohort UE that belongs to same Group ID, each user among the cohort UE is at main MBMS down channel feedback ACK/NACK and CQI information separately, and the base station makes decision whether retransmit and adjust MCS to the feedback information of the UE that belongs to same Group ID by certain strategy.
When the base station issues new data packets by main MBMS down channel, when cohort UE received successfully, cohort UE was correct by up MBMS feedback channel feedback decoding, ACK, CQI information; When cohort UE reception was unsuccessful, cohort UE was by the failure of up MBMS feedback channel feedback decoding, NACK, CQI information, and at this moment the base station can be handled in the following manner, as shown in Figure 4:
1), just on main MBMS down channel, retransmits the packet that it is lost separately, and then transmit new packet to all cohort users as long as there is NACK the base station.
2) if be indivedual cohort UE feedback NACK, for example, a user or an above user feedback NACK, then still on main MBMS down channel, transmit new data block, because each cohort UE is monitoring main MBMS control channel simultaneously, can judge whether the data block of current reception decoding is new data block according to the sign of the indication new data block on the master control channel.Wherein, the cohort UE of feeding back ACK then receives the new data block of transmission on the main MBMS down channel; The cohort UE of feedback NACK then monitors auxilliary MBMS control channel, judge according to the sign of the indication new data block on the auxilliary MBMS control channel whether the data block of current reception decoding is previous TTI decoding failure and is assisting the decoded data block that retransmits on the MBMS down channel, if then both received the decoded data block that retransmits on this this auxilliary MBMS down channel, to utilize auxilliary MBMS down channel modulation system and code efficiency is lower, transmission rate is lower characteristics to guarantee transmission quality, receive the new data block of transmission on the main MBMS down channel simultaneously again.For auxilliary MBMS down channel, owing to there is not corresponding uplink feedback channel, the base station acquiescence can satisfy mass transport, if certain UE still can't correctly be received in the data that retransmit on the auxilliary MBMS down channel, then by more high-rise Radio Link control (RLC) layer protocol request retransmission.
3) if certain UE among certain cohort UE is higher in the NACK of a period of time internal feedback probability, and CQI information indicating channel deterioration, the data on the main MBMS down channel of decoding can't have normally been received in the case, then the base station reports RNC with NACK and CQI feedback information, RNC with this UE from the cohort of this MBMS from removing, it is professional that the base station notifies this UE to stop to receive this MBMS group, distributes air-link resources for this UE again.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1, a kind of transmission method of realizing MBMS is applied to it is characterized in that in the wireless telecommunication system that this method comprises at least:
A. radio network controller identifies for each user in the same sub-district distributes cohort separately according to the required type of service of user of registration MBMS, forms the cohort user;
B. the base station generates cohort sign scramble sequence according to the cohort sign, and with this cohort sign scramble sequence first's information of MBMS control channel is carried out scrambling and handle, and forms first gap information of this channel;
C. base station assigns MBMS down channel, and issue packet to the cohort user by this channel;
D. the cohort user is according to first gap information of MBMS control channel, whether MBMS down channel on have the information of passing to oneself, if having then receive the packet that current MBMS down channel issues if judging.
2, method according to claim 1, it is characterized in that, further comprise before the steps A, the MBMS of user's registration is deposited in Home Location Register, and at corresponding this user's of MBMS server record unique identification, form user's authentication foundation, MBMS administrative center produces the service identification of this business, and mobile switching centre sets up air-link resources according to user's authentication foundation and service identification by the request of radio network controller and base station.
3, method according to claim 1 is characterized in that, further comprise after the step D,
E. after the cohort user receives the packet that current MBMS down channel issues, give the base station by the reception information of up MBMS feedback channel feedback current data packet;
F. the base station receives correct according to step e institute feedback data bag or error message is handled the misdata bag.
4, method according to claim 1 is characterized in that, the described MBMS down channel of step C is a main MBMS down channel.
5, method according to claim 1 is characterized in that, the described MBMS down channel of step C is a pair of main MBMS down channel, auxilliary MBMS down channel.
6, method according to claim 1, it is characterized in that, described steps A further comprises, the user of registration MBMS is by reporting the channel quality of current received signal to the measurement of base station pilot to radio network controller, and radio network controller divides into groups according to the user of channel quality to the registration MBMS.
7, method according to claim 1 is characterized in that, described cohort sign is handed down to the user who registers MBMS by the broadcast channel in the system, forms broadcast traffic transmissions.
8, method according to claim 1 is characterized in that, the user of described cohort sign by registration MBMS dedicated channel separately issues, and forms multicast or broadcast traffic transmissions.
9, method according to claim 1 is characterized in that, described step B comprises,
B01) first's information via code check of MBMS control channel is 1/2 convolution coder coding and code check adaptation coupling, forms first's information of 40 bits;
B02) the block encoding cohort identifies, and forms the sign indicating number sequence of 32 bits, repeats first 8 bit of this yard sequence, forms the cohort sign scramble sequence of 40 bits;
B03) the cohort sign scramble sequence of 40 bits and first's information of 40 bits are carried out XOR, form first gap information of MBMS control channel.
10, according to claim 4 or 5 described methods, it is characterized in that, described step F further comprises the processing of misdata bag, if the base station receives the information that the packet error of any one cohort user feedback receives, then retransmit the packet of losing separately to the cohort user that all receive the misdata bag at main MBMS down channel.
11, method according to claim 5, it is characterized in that, described step F further comprises the processing of misdata bag, if the base station receives the information that the packet error of one or more cohort user feedback receives, then the correct cohort user who receives of feedback data packet monitors main MBMS control channel, and receives the new data packets that passes under the main MBMS down channel; The cohort user that the feedback data packet mistake receives information monitors auxilliary MBMS control channel and main MBMS control channel, receive the packet of auxilliary MBMS down channel retransmission of lost, and receive the new data packets that passes under the main MBMS down channel simultaneously.
12, method according to claim 11, it is characterized in that, described step F further comprises the processing of misdata bag: acquiescence auxilliary MBMS down channel in base station satisfies the quality of transmission, if the cohort user still can't correctly receive the data that retransmit on this channel, then retransmit by the wireless chain control layer agreement request.
13, method according to claim 3, it is characterized in that, described step F further comprises the processing of misdata bag, if the user among the cohort user is frequent at the probability of the information of the packet error reception of a period of time internal feedback, then this user is removed in the base station from this cohort user, distributes air-link resources for this user again.
14, according to claim 1 or 9 described methods, it is characterized in that described cohort is designated 10 bits.
According to claim 1 or 9 described methods, it is characterized in that 15, described MBMS control channel is main MBMS control channel, perhaps is auxilliary MBMS control channel.
16, method according to claim 3 is characterized in that, the described feedback reception of step e information comprises information, the channel quality indication (CQI) information that the correct information that receives of packet, packet error receive.
17, method according to claim 2 is characterized in that, described user ID is an IMSI International Mobile Subscriber Identity, and described MBMS server is virtual supplementary data services device.
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| CN101114921B (en)* | 2006-07-28 | 2010-10-27 | 华为技术有限公司 | Method and device for sending multimedia broadcast/multicast service |
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