CN101437197A

CN101437197A - Method for synchronously sending multicast and broadcast service and multi-hop relay base station

Info

Publication number: CN101437197A
Application number: CNA2007101246009A
Authority: CN
Inventors: 高闻; 马小飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-11-15
Filing date: 2007-11-15
Publication date: 2009-05-20
Anticipated expiration: 2027-11-15
Also published as: WO2009067930A1; CN101437197B

Abstract

The embodiment of the invention discloses a method for transmitting multicast and broadcast services simultaneously, which comprises the following steps: receiving a processing delay time reported by a relay station through a multi-hop relay base station (MR-BS); determining the maximum delay time of the MR-BS according to the processing delay time of the RS and a set cache time; and determining a waiting time of the RS according to the maximum delay time of the MR-BS and the processing delay time of the RS, and transmitting the waiting time to the RS. With the existence the preset cache time, MBS data transmitted by the RS does not have interruption, lose or time delay because certain processing delay time of the RS requires adjustment of or a new RS requires addition. Besides, the embodiment of the invention also discloses the multi-hop relay base station.

Description

A kind of method for synchronously sending multicast and broadcast service and multi-hop relay base station

Technical field

The present invention relates to the communications field, particularly a kind of method for synchronously sending multicast and broadcast service and multi-hop relay base station.

Background technology

Each 3G (Third Generation, 3-G (Generation Three mobile communication system)) normal structure is all clearly supported multicast broadcast service, MBS (Multicast Broadcast Service, multicast broadcast service) is exactly the data that one group of specific user or all users transmitted simultaneously identical content.

Multicast broadcast service generally can be divided into the transmission of single sub-district and many sub-districts send dual mode, under the send mode of many sub-districts, in order to obtain diversity effect at the edge of sub-district and not produce interference mutually, need the data of accomplishing the synchronized transmission identical content between a plurality of sub-districts.Because the demand of capacity or coverage need be introduced RS (Relay Station, relay station) in existing 3G system, support many cell set multicast broadcasting service, also must be synchronous between sub-district and the relaying.

At MR-BS (Multihop Relay Base Station, multi-hop relay base station) RS (the Relay Station that has a plurality of not peer layers under, relay station), the time that these RS handle the MBS data also may have nothing in common with each other, and MR-BS and RS synchronization scenario are as follows at present:

Each RS of step 1. will report their processing time-delay to MR-BS, and MR-BS calculates the maximum delay that needs among all RS;

Step 2.MR-BS calculates their stand-by period of needs separately according to the situation of each RS again, and promptly maximum delay deducts their processing time, and then notifies each RS the stand-by period separately;

When step 3. sent the MBS data when needs, MR-BS can shift to an earlier date maximum delay these MBS data are issued RS, and MR-BS and RS are again according to their stand-by period separately synchronized transmission MBS data on eating dishes without rice or wine then.

The inventor finds in realizing process of the present invention: in the synchronization scenario of existing MR-BS and RS, if the stand-by period that has new RS adding or other reasons need adjust RS, and under the vicissitudinous situation of maximum delay, before and after adjusting, be bound to for some time interruption or delay of MBS business so.Concrete condition is as follows: can interrupt the transmission in advance of MBS business earlier, adjust the stand-by period of RS again, then recover sending in advance of MBS business again and distinguish adjustment front and back MBS data, unavoidably will lose one section MBS data in this case or cause the time-delay of a period of time.

Summary of the invention

In view of this, provide a kind of method for synchronously sending multicast and broadcast service on the one hand, having comprised: MR-BS receives the processing time-delay that relay station RS reports; According to the processing time-delay of RS and the cache-time that is provided with, determine the maximum delay of MR-BS; Delay time according to the maximum delay of MR-BS and the processing of RS, determine the stand-by period of RS, and send to RS; The maximum delay that MR-BS shifts to an earlier date MR-BS sends to RS with multicast broadcast service MBS data, and RS treats stand-by period arrival, sends the MBS data to MS.

A kind of multi-hop relay base station is provided on the other hand, has comprised: receiving element is used to receive the processing time-delay separately that relay station RS reports; Multi-hop relay base station MR-BS maximum delay determining unit is used for determining the maximum delay of MR-BS according to the processing time-delay of RS and the cache-time that is provided with; The stand-by period determining unit is used for the processing time-delay according to maximum delay and the RS of MR-BS, determines the stand-by period of RS; Transmitting element is used for the stand-by period of described RS is sent to described RS.

The MBS data that RS sends because the existence of the cache-time that sets in advance is arranged, thereby increased the maximum delay of MR-BS, so can not need to adjust because of the processing time-delay of some RS or have new RS to add and interrupt, lose or delay time.

Description of drawings

The method flow diagram of a kind of multicast broadcast service synchronized transmission that Fig. 1 provides for the embodiment of the invention one;

Each RS that Fig. 2 provides for the embodiment of the invention two is in the system diagram with the multicast broadcast service synchronized transmission under the state of one-level;

Each RS that Fig. 3 provides for the embodiment of the invention two is in the schematic diagram of the multicast broadcast service synchronized transmission under the state of one-level (before adjusting);

Each RS that Fig. 4 provides for the embodiment of the invention two is in the schematic diagram of the multicast broadcast service synchronized transmission under the state of one-level (adjusting the back);

Each RS that Fig. 5 provides for the embodiment of the invention three is in the system diagram of the multicast broadcast service synchronized transmission under the state not at the same level;

Each RS that Fig. 6 provides for the embodiment of the invention three is in the schematic diagram (new RS adds preceding) of the multicast broadcast service synchronized transmission under the state not at the same level;

Each RS that Fig. 7 provides for the embodiment of the invention three is in the schematic diagram (new RS adds the back) of the multicast broadcast service synchronized transmission under the state not at the same level;

Each RS that Fig. 8 provides for the embodiment of the invention four is in the system diagram of the multicast broadcast service synchronized transmission under peer or the state not at the same level;

The multi-hop relay base station schematic diagram that Fig. 9 provides for the embodiment of the invention five;

The multi-hop relay base station schematic diagram that Figure 10 provides for the embodiment of the invention six;

Embodiment

Referring to accompanying drawing 1, the embodiment of the invention one provides a kind of method of multicast broadcast service synchronized transmission, comprises step:

Step 101. multi-hop relay base station MR-BS receives the processing time-delay separately that relay station RS reports;

Step 102. is determined the maximum delay of MR-BS according to the processing time-delay of RS and the cache-time that is provided with;

Step 103. is determined the stand-by period of RS, and is sent to RS according to the processing time-delay of maximum delay and the RS of MR-BS;

The maximum delay that step 104.MR-BS shifts to an earlier date MR-BS sends to RS with multicast broadcast service MBS data, and RS treats stand-by period arrival, sends the MBS data to mobile station MS.

Need adjustment or have new RS to need to add if MR-BS detects the processing time-delay of some RS, MR-BS recomputates the stand-by period that needs adjustment or initiate RS, this RS of concurrent message informing, because the existence of the cache-time that sets in advance is arranged, thereby increased the maximum delay of MR-BS, so the MBS data that RS sends can not need to adjust because of the processing time-delay of some RS or have new RS to add and interrupt, lose or delay time.

The embodiment of the invention two provides each RS to be in method with the multicast broadcast service synchronized transmission under the state of one-level.System diagram is referring to Fig. 2, this multicast broadcast service synchronized transmission system, and comprising: multi-hop relay base station: MR-BS 201, relay station: RS1 2021, RS2 2022, travelling carriage: MS1 (mobilestation, travelling carriage) 2031, MS2 2032, MS3 2033.Wherein, relay station RS1 2021, RS2 2022 are in same one-level, and referring to Fig. 3, multicast broadcast service synchronized transmission process is as follows under this system:

It is 2 frames that step 301.RS1 reports its time-delay of handling the MBS data to MR-BS, and it is 3 frames that RS2 reports its time-delay of handling the MBS data to MR-BS;

Step 302.MR-BS determines that according to cache-time 2 frames of 3 frames of the maximum delay among each RS and setting the maximum delay of MR-BS is 5 frames; Wherein being provided with of cache-time need be determined for the time-delay perception that receives the MBS data according to the size and the user of RS spatial cache, generally is acceptable within 20 frames or the 200ms under the existence conditions, is set to 2 frames among this embodiment;

Step 303.MR-BS is according to the processing time-delay of maximum delay 5 frames of MR-BS and each RS, determine RS1 stand-by period be the 5-2=3 frame, determine RS1 stand-by period be the 5-3=2 frame, and will the stand-by period separately send to each RS;

Step 304.MR-BS 5 frames in advance sends to each RS with the MBS data;

Step 305.RS1 receives the MBS data, handles the time of 2 frames, wait for the time of 3 frames after, the MBS data are sent to MS1, RS2 receives the MBS data, handles the time of 3 frames, wait for the time of 2 frames after, the MBS data are sent to MS2;

Step 306. is because MR-BS handles the MBS data when not required, so wait for the time of 5 frames after MR-BS sends to each RS with the MBS data after, also the MBS data are sent MS3.

Mobile station MS 1, MS2, MS3 can both receive the MBS data by 5 frames, thereby reach synchronous after MR-BS sends to each RS with the MBS data like this.

Referring to accompanying drawing 4, when the processing time-delay of RS2 became 4 frames by 3 frames, the synchronized transmission of system multicast broadcasting service shown in the accompanying drawing 2 process was as follows:

Step 401.RS2 reports its time-delay of handling the MBS data to be adjusted into 4 frames to MR-BS;

Step 402.MR-BS confirms that the maximum delay among each RS this moment is 4 frames, maximum delay 5 frames than MR-BS are little, that is to say within the maximum delay adjustable range of MR-BS, the stand-by period of recomputating RS2 according to maximum delay 5 frames of MR-BS is the 5-4=1 frame, and the adjusted stand-by period is sent to RS2;

Step 403.RS2 receives the MBS data, handles the time of 4 frames, wait for the time of 1 frame after, the MBS data are sent to MS2;

Step 404. is because the processing of RS2 time-delay is littler than the maximum delay of MR-BS, so after the adjustment of the processing of RS2 time-delay, and is consistent before MR-BS and the RS1 adjustment to the processing time-delay of the handling process of MBS data and RS2;

Mobile station MS 1, MS2, MS3 still can be after MR-BS sends to each RS with the MBS data receive the MBS data during 5 frames like this, each travelling carriage receives that the time of MBS data is preceding the same with the processing time-delay adjustment of RS2, do not change, thereby can not cause dislocation and the disorder of adjusting the front and back data, can not cause time-delay yet.

The embodiment of the invention three provides each RS to be in the method for the multicast broadcast service synchronized transmission under the state not at the same level.System diagram is referring to Fig. 5, this multicast broadcast service synchronized transmission system, and comprising: multi-hop relay base station: MR-BS 501, relay station: RS1 5021, RS2 5022, travelling carriage: MS1 5031, MS2 5032, MS4 5034.Wherein, subordinate, the RS25022 that relay station RS1 5021 is in MR-BS 501 is in the subordinate of RS1 5021, and referring to Fig. 6, multicast broadcast service synchronized transmission process is as follows under this system:

It is 1 frame that step 601.RS2 reports its time-delay of handling the MBS data by RS1 to MR-BS, and RS1 is 1 frame to the time-delay that MR-BS reports RS1 to handle the MBS data.

Step 602.MR-BS is respectively 1 frame according to the time-delay of the processing among the two-stage RS, transmits cache-time 2 frames of MBS data required time 1 frame and setting between RS and determines that the maximum delay of MR-BS is the 1+1+2=4 frame; Wherein being provided with of cache-time need be determined for the time-delay perception that receives the MBS data according to the size and the user of RS spatial cache, generally is acceptable within 20 frames or the 200ms under the existence conditions, is set to 2 frames here; Wherein forwarding time is to change to some extent according to the difference of hardware between RS, also can be 0 frame, and when forwarding time between RS was 0 frame, the maximum delay of MR-BS was the 1+2=3 frame;

Step 603.MR-BS is according to maximum delay 4 frames of MR-BS, and the processing of RS1 1 frame of delaying time, the stand-by period of determining RS1 is the 4-1=3 frame, because RS2 is in the subordinate of RS1, RS1 is transmitted to time 1 frame of RS2, and RS2 to handle time-delay be 1 frame, MR-BS determines that the stand-by period of RS2 is the 4-1-1=2 frame, MR-BS sends to RS1 with the stand-by period of RS1, and stand-by period of RS2 is transmitted to RS2 by RS1;

Step 604.MR-BS 4 frames in advance sends to RS1 with the MBS data;

Step 605.RS1 needs the processing of 1 frame to delay time after receiving the MBS data, waits for after handling that the time transmission MBS data of 3 frames send to MS1; RS1 needs the forwarding time of 1 frame that the MBS data are sent to the relaying RS2 of subordinate after receiving the MBS data;

Step 605.RS2 receives the processing time-delay that needs 1 frame after the MBS data, treat that then it handles the MBS data after, the time of waiting for 2 frames sends the MBS data and sends to MS2;

Step 606. is because MR-BS handles the MBS data when not required, so wait for 4 frames after MR-BS sends to RS1 with the MBS data after, also the MBS data are sent to MS4.

Mobile station MS 1, MS2, MS4 can both receive the MBS data by 4 frames, thereby reach synchronous after MR-BS sends to each RS with the MBS data like this.

Referring to accompanying drawing 5, when the next stage of the RS2 in original system 5032 adds a relaying RS35033 again, its time-delay of handling the MBS data is 1 frame, and referring to accompanying drawing 7, this moment, multicast broadcast service synchronized transmission process was as follows:

It is 1 frame that step 701.RS3 reports its time-delay of handling the MBS data to MR-BS, and its message is transmitted to RS1 by RS2 with it, and RS1 is transmitted to MR-BS again;

Step 702.MR-BS according between existing RS forwarding time 1 frame, RS3 handles maximum delay 4 frames of time-delay 1 frame and MR-BS, the processing time-delay that just increases because of the adding of RS3 is within the maximum delay adjustable range of MR-BS, the stand-by period of determining RS3 is the 4-1-1-1=1 frame, and by RS1, RS2 stand-by period of RS3 is sent to RS3;

The adding of step 703.RS3 and the processing that increases time-delay are within the maximum delay adjustable range of MR-BS, so the handling process of MR-BS, RS1 is constant;

Step 704.RS2 needs the processing of 1 frame to delay time after receiving the MBS data, and the back of finishing dealing with waits for that the time of 2 frames sends to MS2 with the MBS data; RS2 needs the forwarding time of 1 frame that the MBS data are sent to the relaying RS3 of subordinate after receiving the MBS data;

Step 706.RS3 needs the processing of 1 frame to delay time after receiving the MBS data, after finishing dealing with the MBS data is sent to MS3;

Mobile station MS 1, MS2, MS3, MS4 can both be after MR-BS sends to RS1 with the MBS data receive the MBS data during 4 frames like this, each travelling carriage receives that the time of MBS data adds before the same with RS3, thereby can not cause dislocation and the disorder of adjusting the front and back data, can not cause time-delay yet.

For the convenience of explaining, all RS are in and are in not at the same level with RS all among one-level and the embodiment three in the foregoing description two, at least also has this situation in the practical application, the RS that promptly has is in the RS that has not at the same level and is in same one-level, system diagram is referring to Fig. 8, this multicast broadcast service synchronized transmission system, and comprising: multi-hop relay base station: MR-BS 801, relay station: RS1 8021, RS2 8022, RS3 8023, travelling carriage: MS1 8031, MS2 8032, MS3 8033, MS4 8034.Wherein, relay station RS1 8021, RS2 8022 is in the subordinate of MR-BS 801, RS3 8023 is in the subordinate of RS1 8021, MS1 8031 links to each other with RS1 8021, MS2 8032 links to each other with RS2 8022, MS3 8033 links to each other with RS3 8023, MS4 8034 links to each other with MR-BS 801, wherein the processing of each RS time-delay is 1 frame, forwarding time between RS1 8021 and the RS3 8023 is 1 frame, the cache-time that is provided with is 2 frames, the process of determining the maximum delay of MR-BS 801 is: because RS1 8021, the processing time-delay of RS3 8023, forwarding time between its two-stage and cache-time sum are 5 frames, processing time-delay and cache-time sum 3 frames greater than RS2 8022, therefore the maximum delay of MR-BS 801 is 5 frames, determining of concrete each each stand-by period, transmission flow, there is stand-by period of RS need adjust or have new RS to need to add, wherein at the same level referring to embodiment two and not at the same level referring to embodiment three.

Can know by the foregoing description, RS adjusts to handle has new RS to add in time-delay or the system, as long as the processing of its adjustment time or initiate RS time-delay is within the cache-time that sets in advance, the maximum delay of MR-BS just can change, do not need to interrupt the MBS business this moment, can not cause the dislocation and the disorder of data before and after adjusting yet.Referring to accompanying drawing 9, example five of the present invention provides a kind of multi-hop relay base station MR-BS, comprising: receiving element 901 is used to receive the processing time-delay separately that relay station RS reports; MR-BS maximum delay determining unit 902 is used for determining the maximum delay of MR-BS according to the processing time-delay of each RS and the cache-time that is provided with; Stand-by period determining unit 903 is used for the processing time-delay according to maximum delay and each RS of MR-BS, determines the stand-by period of each RS; Transmitting element 904 is used for the stand-by period of each RS is sent to described each RS.When each RS is positioned at when not at the same level, wherein: MR-BS maximum delay determining unit is determined the maximum delay of MR-BS according to the cache-time of forwarding time and setting between the processing time-delay of RS, RS; The stand-by period determining unit is determined the stand-by period of RS according to the processing time-delay of forwarding time and RS between the maximum delay of MR-BS, RS.Also be so among the following embodiment five, just repeated no more below.

Referring to accompanying drawing 10, example six of the present invention provides a kind of multi-hop relay base station MR-BS, comprising: cache-time determining unit 1006 is used for for the time-delay perception that receives the MBS data cache-time being set according to spatial cache and user; Receiving element 1001 is used to receive the processing time-delay separately that relay station RS reports; MR-BS maximum delay determining unit 1002 is used for the cache-time according to processing time-delay and 1006 settings of cache-time determining unit of each RS, determines the maximum delay of MR-BS; Stand-by period determining unit 1003 is used for the processing time-delay according to maximum delay and each RS of MR-BS, determines the stand-by period of each RS; Transmitting element 1004 is used for the stand-by period of each RS is sent to described each RS.

Adjusted or have new RS to add as the processing of RS time-delay, receiving element 1001 receives the processing time-delay of adjusted RS or the processing time-delay of initiate RS, stand-by period determining unit 1003 is according to maximum delay and the processing time-delay of described adjusted RS or the processing time-delay of initiate RS of MR-BS, redefine the stand-by period of adjusted RS or initiate RS, transmitting element 1004 will need the stand-by period of the RS that adjusts or initiate RS to send to corresponding RS again.Wherein the processing of RS time-delay has and adjusts or information that new RS adds can be judged above-mentioned adjustment or adding information and be notified stand-by period determining unit 1003 to do corresponding the variation by receiving element 1001, the also processing time-delay of the adjusted RS that can directly send according to receiving element by stand-by period determining unit 1003 or the processing time-delay of initiate RS, the processing time-delay of judging RS needs to adjust or new RS adding is arranged, and makes corresponding variation then.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a method for synchronously sending multicast and broadcast service is characterized in that, comprising:

Multi-hop relay base station MR-BS receives the processing time-delay that relay station RS reports;

According to the processing time-delay of RS and the cache-time that is provided with, determine the maximum delay of MR-BS;

Delay time according to the maximum delay of MR-BS and the processing of RS, determine the stand-by period of RS, and send to RS;

The maximum delay that MR-BS shifts to an earlier date MR-BS sends to RS with multicast broadcast service MBS data, and RS treats described stand-by period arrival, sends the MBS data to mobile station MS.

2. the method for claim 1 is characterized in that, and is described according to the processing time-delay of RS and the cache-time that is provided with, and determines the maximum delay of MR-BS, is specially:

When described RS was in one-level, according to the value of the maximum in each RS processing time-delay, and the cache-time of described setting was determined the maximum delay of MR-BS;

When described RS is in when not at the same level, according to the forwarding time between the processing time-delay of each grade RS, required RS not at the same level, and the cache-time of described setting is determined the maximum delay of MR-BS.

3. the method for claim 1 is characterized in that, described method also comprises:

Described MR-BS knows that the processing time-delay that RS is arranged needs adjustment, and MR-BS redefines the stand-by period of the RS that needs adjustment according to the processing time-delay of maximum delay and the adjusted RS of described MR-BS, and sends to the described RS that needs adjustment.

4. the method for claim 1, it is characterized in that, when described RS is in when not at the same level, described according to MR-BS maximum delay and the processing time-delay of RS, the stand-by period of determining each RS is specially: according to the processing time-delay of forwarding time and each RS at different levels between the maximum delay of described MR-BS, RS, determine the stand-by period of each RS.

5. the method for claim 1 is characterized in that, described method also comprises:

Described MR-BS is known has new RS to add, and described new RS and described RS are in same one-level, MR-BS calculates the stand-by period of initiate RS according to the maximum delay of described MR-BS and the processing time-delay of described initiate RS, and sends to described initiate RS;

Perhaps described MR-BS learns that new RS adds, and described new RS and described RS are in not at the same level, MR-BS is according to the processing time-delay of the maximum delay of described MR-BS, described initiate RS, the forwarding time between RS, calculate the stand-by period of initiate RS, and send to described initiate RS.

6. the method for claim 1 is characterized in that, described method also comprises:

For the time-delay perception that receives the MBS data described cache-time is set according to spatial cache and user.

7. the method for claim 1 is characterized in that, described method also comprises:

After described MR-BS sends to the RS of its subordinate with described MBS data, described MBS data are sent to coupled MS after waiting for the maximum delay of described MR-BS.

8. a multi-hop relay base station is characterized in that, comprising:

Receiving element is used to receive the processing time-delay separately that relay station RS reports;

Multi-hop relay base station MR-BS maximum delay determining unit is used for determining the maximum delay of MR-BS according to the processing time-delay of RS and the cache-time that is provided with;

The stand-by period determining unit is used for the processing time-delay according to maximum delay and the RS of MR-BS, determines the stand-by period of RS;

Transmitting element is used for the stand-by period of described RS is sent to described RS.

9. MR-BS as claimed in claim 8 is characterized in that, described RS is in when not at the same level, and described MR-BS maximum delay determining unit is determined the maximum delay of MR-BS according to the cache-time of forwarding time and setting between the processing time-delay of RS, RS; The stand-by period determining unit is determined the stand-by period of RS according to the processing time-delay of forwarding time and RS between the maximum delay of MR-BS, RS.

10. MR-BS as claimed in claim 8 is characterized in that,

Receiving element receives the processing time-delay of adjusted described RS or the processing time-delay of initiate RS;

Described stand-by period determining unit redefines the stand-by period of adjusted RS or initiate RS according to maximum delay and the processing time-delay of described adjusted RS or the processing time-delay of described initiate RS of MR-BS.

11. MR-BS as claimed in claim 8 is characterized in that, described MR-BS also comprises:

The cache-time determining unit is used for for the time-delay perception that receives the MBS data described cache-time being set according to spatial cache and user.