CN1897745A - Equilibrium method for transmitting MBMS service data - Google Patents
Equilibrium method for transmitting MBMS service data Download PDFInfo
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- CN1897745A CN1897745A CNA2005100840490A CN200510084049A CN1897745A CN 1897745 A CN1897745 A CN 1897745A CN A2005100840490 A CNA2005100840490 A CN A2005100840490A CN 200510084049 A CN200510084049 A CN 200510084049A CN 1897745 A CN1897745 A CN 1897745A
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Abstract
The method comprises: in the first 'discretely transmitting cycle', each cell receives PDU data packet from the shared RLC, and makes numbering for the PDU; according to the schedule information, the 'transmission state' of each cell is reported to the public module; according to the first scheduling information, each cell sends data on the logical channel; according to the received data, the public module figures out the average value of 'transmission state', and feeds back it to each cell; figuring out the different value between the 'transmission state' and the average value; according to the level of the different value and the priority of each MTCH mapped to a same FACH, making the scheduling for the data in next scheduling cycle.
Description
Technical field
When the present invention relates to provide in WCDMA (Wideband Code Division Multiple Access (WCDMA)) mobile communication system MBMS (multimedia broadcasting and multicast service) professional, the sub-district of " putting multipoint system " and send data for those employings sends business datum with a kind of mode of equilibrium.
Background technology
Multimedia broadcasting and multicast service (hereinafter to be referred as MBMS) are that a standardized new business is being carried out in third generation partner plan (being called for short 3GPP).The MBMS business is the business of a kind of unidirectional " point-to-multipoint mode ", and the maximum characteristics of this business are that it can effectively utilize Radio Resource and Internet resources.
Fig. 9 has described the system configuration of MBMS business, and the network configuration of MBMS business is based on GPRS (being called for short GPRS) core net.Be description below to Fig. 1.
901 core net are data sources of MBMS business, send data by the 902Iu interface to 903UTRAN (land radio access web), and UTRAN sends data to 905 user terminals (being used for receiving the terminal equipment of data) by the 904Uu interface again.902Iu is the interface between core net and UTRAN, because UTRAN is managing a group sub-district, so sent to link of MBMS data sharing of each sub-district by core net.In UTRAN, data are replicated and are distributed to each sub-district.904Uu is an air wireless interface, owing in a sub-district a plurality of users (terminal) are usually arranged, when this MBMS users interest is Hot Spot more than some or this sub-district, UTRAN will adopt the mode of point to multiple spot in this sub-district, transmit data with a wireless links (common signal channel), all receive data on this common link the user under this sub-district.The present invention only discusses and adopts point to send situation to the MBMS data under the multipoint system.
UTRAN provides Radio Resource for MBMS serves on the interface aloft, and Fig. 2 is for specifying the mapping relations of the logic channel (MTCH) and the transmission channel (FACH) that are used to transmit the MBMS business.201MTCH (point of MBMS is to the Traffic Channel of multiple spot) is the logic channel of carrying MBMS data, and each MTCH only serves a MBMS business.202FACH (forward access channel) is the transmission channel of carrying MBMS data, and a plurality of MTCH can be mapped on the same FACH.
In order to save resource, the discontinuous send mode of the The data on the MTCH, the schedule information of discontinuous transmission sends to user terminal by MSCH (logic channel of MTCH schedule information).
Fig. 3 has illustrated in UTRAN, the distribution mechanisms of MBMS business datum.It is the packet of unit that 301RLC (wireless chain control layer) is divided into the MBMS data with RLC PDU (Packet Data Unit), 302MAC (media access control layer) adds Logic Channel Identifier and MBMS service identification be responsible for for the PDU from RLC, and according to processed from the packet on each logic channel.In UTRAN, there is a MAC entity of handling the MBMS business each sub-district, for a certain MBMS business, adopts the RLC entity of sharing, and handles the MAC entity that the RLC PDU that obtains was replicated and was distributed to each sub-district through RLC.The RLC entity is numbered for all RLC PDU, and this numbering can be used for selective synthesizing and mechanism by user terminal.
Fig. 4 has described user terminal for " selective synthesizing and mechanism " from the business datum of the same MBMS of neighbor cell.Be in the user terminal of cell edge, to pass through the processing of different MAC entities from the same MBMS data of different districts.Because the same data from different sub-districts are surrounded by different transmission and processing delay, so be buffered the ability that how much depends on user terminal of buffer memory through MAC data processed bag.When from the delay between the same packet of different districts within the specific limits the time, this packet can selectively be received according to signal quality by the RLC entity.The data that transmit when certain sub-district are surrounded by loses or signal when too weak, and terminal is just selected that packet of better quality of signal, and the advantage of the selective synthesizing of data terminal and mechanism is just obvious especially.
Can exist a plurality of employings to put the MBMS business of multipoint system in same sub-district, each MBMS business all takies a MTCH channel, and might exist a plurality of MTCH channel Mapping to same FACH transmission channel.So just there is competition for the FACH transmission channel resources.The business of high priority can be grabbed the resource of low priority traffice.
Suppose that sub-district 1 and sub-district 2 are neighbor cells, and:
Two points are arranged to the MBMS of multipoint system professional 1 and professional 2 on the sub-district 1, and professional 1 priority is greater than professional 2 priority, they take MTCH (a) and MTCH (b) respectively, and these two logic channels are mapped on the same FACH (x);
Equally, two points are arranged to the MBMS of multipoint system professional 2 and professional 3 on the sub-district 2, and professional 2 priority is greater than professional 3 priority, they take MTCH (c) and MTCH (d) respectively, and these two logic channels are mapped on the same FACH (y);
The data of sub-district 1 and 2 MBMS business 2 according to Fig. 3, are shared the RLC entity, and the packet after handling through RLC is replicated and is distributed to sub-district 1 and 2 MAC entity separately, and afterwards, the data processing in sub-district 1 and 2 transmits separate, is independent of each other.
When these three MBMS business provide simultaneously, might there be following situation:
In sub-district 1, because business 1 is always grabbed professional 2 resource, professional 2 can only be sent to user terminal to data with slower speed.
In sub-district 2, because business 2 is always grabbed professional 3 resource, professional 2 can be sent to user terminal to data with fast speeds.
There is a user terminal receiving MBMS business 2, it is in the edge of sub-district 1 and 2, receive two sub-districts simultaneously and give the data of the business 2 of coming, professional 2 at first, user terminal can also adopt " selective synthesizing and mechanism ", and As time goes on, 1 and 2 transmission delay may be increasing in the sub-district for professional 2 data, finally, user terminal can't be realized " selective synthesizing and mechanism ".
Because the MBMS combinations of services of each sub-district varies, same business is in the same transmission cycle of each sub-district, occupation condition for the FACH channel also is not quite similar, As time goes on, the difference of the transmission progress of each sub-district can be increasing, and then, will have increasing user terminal and can't realize " selective synthesizing and mechanism ".
This problem is because after handling through the RLC that shares, and is separate when same MBMS business datum is handled in each sub-district, is independent of each other and causes.
Improve the transmit mechanism of UTRAN side, just should make the processing of same MBMS business in each sub-district, keep as much as possible acting in agreement, be more or less the same on time, like this, it is just not too large from the delay between the data of neighbor cell that user terminal receives, and " selective synthesizing and mechanism " also could farthest be utilized.
Summary of the invention
The purpose of this invention is to provide a kind of method of the balanced MBMS of transmission business datum,, utilize dynamic dispatching mechanism, can when sending the MBMS data, keep as much as possible acting in agreement so that each adopts point to the multipoint system sub-district for same MBMS business.And then make user terminal be easy to realize " selective synthesizing and mechanism ".
For achieving the above object, a kind of balanced method that sends the MBMS business datum may further comprise the steps:
1) in first " discontinuous transmission cycle ", each sub-district is received from the PDU packet of sharing RLC, is begun to number to PDU;
2), " transmit status " of each sub-district reported to public module according to schedule information;
3) each sub-district sends data according to the information of dispatching for the first time on logic channel;
4) public module is obtained the average of transmit status according to the data of collecting;
5) public module feeds back to each sub-district to this average;
6) obtain " transmit status " of each sub-district deviation,, the data in next " transmission cycle " are dispatched according to the degree and the priority that is mapped to last each MTCH of same FACH of deviation for " average ".
The present invention adopts a kind of method of reporting feedback, makes certain sub-district when sending the MBMS data, knows the transmission progress situation of other sub-district, when its send too fast the time, it will reduce the transmission speed of oneself; Otherwise, when too slow, accelerate transmission speed.
Description of drawings
Fig. 1 is the logical network equipment drawing of MBMS business;
Fig. 2 is the mapping relations of the logic channel and the transmission channel of MBMS business;
Fig. 3 is the MBMS data transmission mechanism in UTRAN;
Fig. 4 is a user terminal for selective synthesizing and mechanism from the same MBMS business datum of neighbor cell;
Fig. 5 is the report process of feedback among the UTRAN;
Fig. 6 is the information processing operation flow process of public module;
Fig. 7 is the scheduling flow that certain sub-district is sent data;
Fig. 8 is the sequential relationship that schedule information is notified to user terminal and sends data according to schedule information;
Fig. 9 is the structure of MBMS data dispatch.
Embodiment
The present invention is made of two basic modules, " 101 scheduling send the module of MBMS business datum " and " 102 public module ", and they all are in the Radio Access Network.As Fig. 1, dispatch the data that each sub-district will send by 101 scheduler modules, and schedule information is reported to 102 public modules, then, public module is obtained the mean value of transmit status (transmission progress), and it is fed back to scheduler module.In next dispatching cycle, when 101 scheduler modules are dispatched the MBMS data of each sub-district, can take the mean value that receives into account.
As can be seen from Figure 3, the MBMS data sharing RLC entity, the packet that RLC produces is called RLC PDU (Packet Data Unit), and these PDU are replicated and are transmitted to the MAC entity of each sub-district, because each sub-district sends inconsistent the beginning by the MAC entity of data step;
And as can be seen from Figure 2, the MTCH channel of serving different MBMS business respectively can be mapped on the same FACH transmission channel, and may there be the situation of fighting for resource in a plurality of MTCH channels.So the data that send on to certain sub-district were dispatched in a transmission cycle, should be between RLC and the MAC, and be scheduling logic channel MTCH and used resource thereof.
In standard TS25.346 v6.2.0, stipulate, will dispatch, make the sub-district send business datum to user terminal in discrete mode for the MTCH channel.This schedule information referred in a discontinuous transmission cycle, what wireless data frame FACH is gone up distribute to this MTCH channel, and point out first radio frames original position.For the purpose of simplifying the description, the scheduling for the business datum transmission described in the present invention referred in the transmission cycle of MTCH, arranged what data blocks to send downwards.The notion that illustrates in its essence and the standard does not have essential distinction.
The present invention has utilized the report feedback mechanism, and the data transmission rate of oneself can dynamically be adjusted in each sub-district, makes the transmission step basically identical of each sub-district.Fig. 5 has illustrated the report process of feedback among the UTRAN.For the ease of the transmit status of reporting and adding up each sub-district, will starting from scratch for the PDU package number from RLC in each sub-district, progressively increases one by one, and it is unique that the numbering of each PDU will keep in this professional period of service.This numbering only is used for reporting feedback mechanism, does not issue user terminal with packet.Public module among Fig. 5 can be RLC, also can be that RRC (Radio Resource control) waits other module.
501 first " the discontinuous transmission cycle " and in, each sub-district is received from the PDU packet of sharing RLC, is begun to number to PDU.In first transmission cycle, do not send data, only second transmission cycle sent scheduling, according to the situation that takies of FACH resource separately, planning sends the number of packet in second transmission cycle, and this is as scheduling for the first time.
502 according to the result of each sub-district in the scheduling first time, and " sequence number of last packet that planning will send (numbering) " sent to public module.This numbering is as " transmit status " of each sub-district second transmission cycle.
503 each sub-districts are gone up the transmission data according to the information of dispatching for the first time at logic channel (MTCH).
504 public modules are received the transmit status from each sub-district, when second " discontinuous transmission cycle " begins, calculate the average (mean value) of " transmit status " of this MBMS business datum.
The average that 505 public modules calculate sends to each sub-district.
506 obtain second of this sub-district sends " transmit status " in cycle " deviation " with respect to " average ", according to the character of deviation and the priority of this service logical channels, the 3rd transmission cycle is dispatched, as " scheduling for the second time ".
507 according to the result who dispatches for the second time, report " transmit status for the second time " (sequence number of planning last RLC PDU packet that will send in the next cycle is issued public module).
508 each sub-districts send data according to the schedule information second time on logic channel MTCH
509 with 594, calculate " average " of " transmit status ".
The average of 510 feedback transmit statuss is given each sub-district.
The flow process in the 3rd transmission cycle is second transmission cycle together, the follow-up transmission cycle and the like.
Report process of feedback for Fig. 5 introduction, there is a problem, if in each cycle, the report and the feedback sub-district " transmit status " and " average " time, the information of each sub-district with one independently message carry, the message number of a group sub-district will be very huge so, and in a group sub-district, the MBMS business of carrying out simultaneously has a lot of.Like this, problem will be more serious.The present invention has provided the method that reduces intermodule interactive information quantity.Adopt two kinds of approach to address this problem jointly, will reduce the quantity of interactive information greatly.In realization, the function of one group of sub-district is realized that by a disposable plates whole a group sub-district only needs several disposable plates seldom.
Method one: all ongoing MBMS business on each sub-district, they " transmit status " is incorporated into together " transmit status " as this sub-district.
Method two: in each discontinuous transmission cycle, a disposable plates is only used a message, carries " transmit status " information of all sub-districts that are in this plate.Feedback information is also used similar mode.
Adopt this two kinds of methods simultaneously,, in a transmission cycle, only need one and report message and a feedback message, just can satisfy the mutual needs of all MBMS business of all sub-districts on this plank for a disposable plates.
Then, do to introduce for the information processing operation flow process of the public module of Fig. 5.As Fig. 6.
601 public modules receive the information of " report ".
602 because an information of a disposable plates comprises the information of a plurality of business of a plurality of sub-districts, at first, information is classified by different MBMS business.
603 for certain MBMS business, and the transmit status of adding up each sub-district is obtained average.
604 to look for deviation be the sub-district of negative value, and these sub-districts belong to and send the slow partially sub-district of data.Find out too slow sub-district again from slow partially sub-district, promptly those deviations are negative, and the absolute value of deviation is greater than the sub-district of certain thresholding.These sub-districts belong to minority.The setting of thresholding occurrence can rule of thumb be worth or simulation result is determined.
Whether 605 checks exist those to send the too slow sub-district of data, if exist, then carry out 606 and average again, if there is no, then jump to 608.
606 ignore those sends the slow excessively sub-district of data, is that integral body is obtained " average " of " transmit status " with other sub-district again.
607 judge whether that " average " of all MBMS business all obtains.
608 send " average " information to each sub-district.Go to influence of the scheduling of each sub-district with this " average " to " next transmission cycle ".
Continuation is described further the process of Fig. 5, sends scheduling flow such as Fig. 7 of certain MBMS data for certain sub-district.
In first discontinuous transmission cycle, do not send business datum, only second period is sent data and carry out programming dispatching.
701 receive " average " (" average " of " transmit status " in this " transmission cycle ") of sending from public module.
702 obtain this sub-district sends " deviation " of the transmit status in cycle with respect to average at this.Deviation represents transmission fast for just; Otherwise, send slow partially.
Whether the absolute value of 703 check deviations is less than thresholding A.Absolute value illustrates that less than thresholding A " transmit status " of this sub-district is relatively more normal, there is no need transmission rate is adjusted.Thresholding A occurrence is determined by empirical value or simulation result.
704 for those deviations greater than thresholding A, need carry out the sub-district that speed is adjusted, further check.Deviation illustrates that for just this sub-district transmission is too fast, and data transmission rate need slow down.Deviation illustrates that for negative transmission is too slow, needs to quicken.
If it is too slow that 705 these sub-districts send, need further check.Compete several MTCH (logic channel) of same FACH (transmission channel) resource, the MTCH that priority is high can preferentially obtain resource.Check this professional pairing MTCH, if its priority itself is the highest, it one preferentially obtains resource surely, execution 708.If the configuration of its priority is lower, then take compulsory measure, make it can in " next transmission cycle ", preferentially obtain resource, carry out 707.
706 for sending the too fast sub-district of data, and in the next one transmission cycle, data are not sent out in planning.
The 707 temporary transient pairing MTCH of these MBMS that improve make its priority the highest in the pairing MTCH of this FACH in the next one priority in transmission cycle.Note, in the next transmission cycle, after sending data, next time before the scheduling, reduce the priority of this MTCH.
708 for the situation that need not to adjust transmission rate He can't improve transmission rate, according to traditional approach the next one transmission cycle is dispatched.
709 finish current scheduling.
For certain MBMS business, in certain discontinuous transmission cycle, after traffic control finishes, this schedule information (number of the skew of Frame and lasting frame) will be notified to user terminal timely.In next cycle, user terminal utilizes this schedule information to receive the MBMS business.Schedule information is notified to user terminal and sends sequential relationship such as Fig. 8 of MBMS data according to schedule information.
801 in first " discontinuous transmission cycle ", does to send for the first time scheduling (to the scheduling of the data that will send in " second transmission cycle ").
802 send " schedule information " gives user terminal.
803 beginnings second " discontinuous transmission cycle " send business datum to user terminal according to " schedule information for the first time ".
804 pairs of next ones " discontinuous transmission cycle " send the scheduling of data.
805 " schedule informations " that send " the 3rd transmission cycle " are given user terminal.
806 the 3rd " discontinuous transmission cycle ", sends business datum to user terminal according to " schedule information for the second time ".
Subsequent action and the like.
The effect of a. inventing
The present invention in the residential quarter that a group adopts point-to-multipoint mode, has proposed a kind of for the MBMS business Send the method for business datum, so that each residential quarter can be adjusted the speed that sends data dynamically, The step that each residential quarter sends same business datum is more consistent, and each user terminal just can be maximum The utilization of degree " selective synthesizing and mechanism ".
If each residential quarter independently sends the MBMS business datum according to traditional approach, because this business Be not quite similar in each transmission cycle in the available resource in each residential quarter, along with the propelling of time, This inconsistent can the accumulation, the progress difference of the transmission data of each residential quarter be increasing, So that increasing user terminal can't be realized " selective synthesizing and mechanism ", the present invention can be very Good addresses this problem.
Claims (12)
1. balanced method that sends the MBMS business datum may further comprise the steps:
1) in first " discontinuous transmission cycle ", each sub-district is received from the PDU packet of sharing RLC, is begun to number to PDU;
2), " transmit status " of each sub-district reported to public module according to schedule information;
3) each sub-district sends data according to the information of dispatching for the first time on logic channel;
4) public module is obtained the average of transmit status according to the data of collecting;
5) public module feeds back to each sub-district to this average;
6) obtain " transmit status " of each sub-district deviation,, the data in next " transmission cycle " are dispatched according to the degree and the priority that is mapped to last each MTCH of same FACH of deviation for " average ".
2. method according to claim 1 is characterized in that: each data is surrounded by an ascending numbering that increases progressively, and this numbering keeps unique in the period of service of this MBMS.
3. method according to claim 1 is characterized in that: described public module is the entity of RLC (Radio Link control) functional entity or the convenient visit of RRC.
4. method according to claim 1 and 2 is characterized in that: the numbering of described packet is not issued user terminal with packet.
5. method according to claim 1 is characterized in that not sending data in first transmission cycle, only second transmission cycle was sent scheduling.
6. method according to claim 1 is characterized in that the average that begins to calculate transmit status second " discontinuous transmission cycle ".
7. method according to claim 1 is characterized in that all employings in each sub-district
" transmit status " of the MBMS business of " putting multipoint system " combines " transmit status " as this sub-district.
8. method according to claim 1 is characterized in that in each discontinuous transmission cycle, each disposable plates is carried the state information of all affiliated subdistricts with a message, reports and gives public module.
9. method according to claim 1 is characterized in that: when public module calculates " average " of " transmit status ", remove those send slowly and deviation greater than the transmit status of the sub-district of a certain thresholding.
10. method according to claim 9 is characterized in that described thresholding rule of thumb is worth or simulation result is determined.
11. method according to claim 1 is characterized in that also comprising the adjustment for cell data speed, comprises step:
1) for deviation sub-district within the specific limits, dispatches in the conventional mode;
2) for sending too fast sub-district, make it in next cycle, not send out data;
3) for sending too slow sub-district, if can make it rob the resource that accounts for FACH by the priority that improves logic channel, just in the next cycle, temporarily make the priority of this professional pairing logic channel MTCH the highest, if its priority was exactly the highest originally, then dispatch according to traditional approach.
12. method according to claim 1, it is characterized in that also comprising that traffic control finishes after, comprise step:
Send " schedule information " and give user terminal;
In the beginning in second " discontinuous transmission cycle ", send business datum to user terminal according to " first schedule information ";
Next " discontinuous transmission cycle " sent the scheduling of data;
" schedule information: " that send " the 3rd transmission cycle " gives user terminal;
The 3rd " discontinuous transmission cycle ", send business datum to user terminal according to " schedule information for the second time ".
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| CNA2005100840490A CN1897745A (en) | 2005-07-15 | 2005-07-15 | Equilibrium method for transmitting MBMS service data |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008098521A1 (en) * | 2007-02-15 | 2008-08-21 | Huawei Technologies Co., Ltd. | Transmission method, system and device for multicast/broadcast service mbms |
| CN101945336A (en) * | 2009-07-06 | 2011-01-12 | 中兴通讯股份有限公司 | Dispatching processing method of multimedia broadcast multicast service and lower network elements |
| CN101500320B (en) * | 2008-01-29 | 2011-07-27 | 富士通株式会社 | Base station apparatus |
| CN101262626B (en) * | 2007-03-05 | 2012-01-25 | 电信科学技术研究院 | MBMS channel transmission method and system, network and terminal |
| CN101267248B (en) * | 2007-03-15 | 2012-09-05 | 中兴通讯股份有限公司 | Synchronization method and device spanning across wireless network controller in broadcast service data |
| CN101267247B (en) * | 2007-03-15 | 2012-09-05 | 中兴通讯股份有限公司 | Iu interface time synchronization method and device |
| CN102905225A (en) * | 2012-09-17 | 2013-01-30 | 南京邮电大学 | Self-adaptive scheduling method of multimedia broadcast multicast service (MBMS) system |
| CN101743763B (en) * | 2007-07-18 | 2014-06-25 | 富士通株式会社 | Base station, apparatus and mobile |
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- 2005-07-15 CN CNA2005100840490A patent/CN1897745A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008098521A1 (en) * | 2007-02-15 | 2008-08-21 | Huawei Technologies Co., Ltd. | Transmission method, system and device for multicast/broadcast service mbms |
| CN101262626B (en) * | 2007-03-05 | 2012-01-25 | 电信科学技术研究院 | MBMS channel transmission method and system, network and terminal |
| CN101267248B (en) * | 2007-03-15 | 2012-09-05 | 中兴通讯股份有限公司 | Synchronization method and device spanning across wireless network controller in broadcast service data |
| CN101267247B (en) * | 2007-03-15 | 2012-09-05 | 中兴通讯股份有限公司 | Iu interface time synchronization method and device |
| CN101743763B (en) * | 2007-07-18 | 2014-06-25 | 富士通株式会社 | Base station, apparatus and mobile |
| CN101500320B (en) * | 2008-01-29 | 2011-07-27 | 富士通株式会社 | Base station apparatus |
| CN101945336A (en) * | 2009-07-06 | 2011-01-12 | 中兴通讯股份有限公司 | Dispatching processing method of multimedia broadcast multicast service and lower network elements |
| WO2011003287A1 (en) * | 2009-07-06 | 2011-01-13 | 中兴通讯股份有限公司 | Scheduling processing method for multimedia broadcast and multicast service and lower-layer network elements |
| US8855037B2 (en) | 2009-07-06 | 2014-10-07 | Zte Corporation | Scheduling processing method for multimedia broadcast and multicast service and lower-layer network element |
| CN101945336B (en) * | 2009-07-06 | 2015-05-13 | 中兴通讯股份有限公司 | Dispatching processing method of multimedia broadcast multicast service and lower network elements |
| CN102905225A (en) * | 2012-09-17 | 2013-01-30 | 南京邮电大学 | Self-adaptive scheduling method of multimedia broadcast multicast service (MBMS) system |
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