CN1764086A - System and method for realizing wireless broadcast multicast service synchronizing delivery - Google Patents
System and method for realizing wireless broadcast multicast service synchronizing delivery Download PDFInfo
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Abstract
The invention relates to a system and method to realize wireless board multicast business synchronous transmission, which comprises: in wireless communication system, the first distribution body sends the business and time information to intermediate distribution body, the latter sends data to receive-send information device; the receive-send device determines time and sends data according to received information. This invention decreases receive time between the first and last receive-send device, benefit to realize transmission synchronization, and ensures the reliability.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of system and method for realizing the wireless broadcast multicast service synchronized transmission.
Background technology
At present, all adopt the mobile cellular technology to realize that BroadCast MultiCast Service eating dishes without rice or wine in wireless communication system carried out broadcast transmission in the wireless communication system usually.As shown in Figure 1, when travelling carriage in the sub-district 1, during the edge of sub-district 2 and sub-district 5, if these 3 sub-districts have all sent BroadCast MultiCast Service, travelling carriage need carry out soft merging to improve the travelling carriage demodulation performance to the signal that described three sub-districts send so, so just requires the BroadCast MultiCast Service of sub-district 1, sub-district 2 and sub-district 5 to send synchronously.In like manner, the BroadCast MultiCast Service to sub-district 2, sub-district 3 and sub-district 6 need send synchronously.And the like, require 13 sub-districts that send BroadCast MultiCast Service among Fig. 1 all to need to send synchronously.
Therefore, handle for the soft merging of carrying out the BroadCast MultiCast Service signal that a plurality of sub-districts send, the BroadCast MultiCast Service in the wireless communication system need carry out the Synchronous Processing that signal sends in a big way.
At present, the main transmission simultaneous techniques that adopts all is the single-stage distribution simultaneous techniques that adopts, as shown in Figure 2, by the single-stage distribution entity described BroadCast MultiCast Service is distributed to each transceiver, the transmitting time of agreement transceiver in the process of transmitting, and according to the transmitting time of receiving described BroadCast MultiCast Service is sent synchronously, thereby realize the synchronized transmission of wireless broadcast multicast service by each transceiver.For example, the soft merging of forward direction of CDMA 2000 1X (code division multiple access) system be exactly adopt an entity forward direction at the most 6 branches send the broadcast multicast service data signal to transceiver simultaneously, and described broadcast multicast service data signal Synchronization is sent by described transceiver.
As can be seen, there is following shortcoming in described single-stage distribution simultaneous techniques:
1, in wireless communication system, synchronous if desired zone is bigger, then the time of reception difference of the time of reception of the transceiver of first reception broadcast multicast service data bag and the transceiver that last receives the broadcast multicast service data bag is bigger, is unfavorable for that BroadCast MultiCast Service sends synchronous realization;
If the branch of the BroadCast MultiCast Service signal of 2 single-stage distribution entity distribution is too many, will makes that the disposal ability of this single-stage distribution entity is limited, and then have influence on synchronous effect.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of wireless broadcast multicast service of realizing and send synchronous system and method, so that effectively guarantee the synchronized transmission of BroadCast MultiCast Service under big zone, the multiple-limb situation.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of system that realizes the wireless broadcast multicast service synchronized transmission, comprising: one-level distribution entity, a plurality of intergrade distribution entity and a plurality of transceiver; Described one-level distribution entity sends to each intergrade distribution entity with BroadCast MultiCast Service and transmission time information, and send to each transceiver by each intergrade distribution entity, afterwards, determine the time and the transmission of synchronized transmission BroadCast MultiCast Service message according to the information of receiving by each transceiver.
Described one-level distribution entity and a plurality of intergrade distribution entity are arranged at respectively in the network entity of cordless communication network, and described intergrade distribution entity can be a secondary distribution entity of single-stage, perhaps multistage a plurality of distribution entity.
The present invention also provides a kind of method that realizes the wireless broadcast multicast service synchronized transmission, comprising:
A, the one-level distribution entity in wireless communication system send to each intergrade distribution entity respectively with BroadCast MultiCast Service stream and transmission time information;
B, intergrade distribution entity obtain described BroadCast MultiCast Service stream and transmission time information, and continue to be distributed to respectively each transceiver;
C, each transceiver are sent the BroadCast MultiCast Service stream of receiving according to the intergrade distribution entity information is determined transmitting time, and sends processing.
Described steps A also comprises:
In wireless communication system, need to realize in the zone of BroadCast MultiCast Service synchronized transmission an one-level distribution entity only to be set, and described one-level distribution entity is arranged on the network entity in the described zone.
Described transmission time information comprises:
The temporal information of the transmission BroadCast MultiCast Service stream that the intergrade distribution entity is calculated.
Described steps A comprises:
One-level distribution entity in wireless communication system adds that according to the current time in system corresponding time delay obtains the transmission time information that the secondary distribution entity sends BroadCast MultiCast Service stream;
Described transmission time information is sent to each secondary distribution entity respectively with the BroadCast MultiCast Service stream of receiving.
Described step B comprises:
B1, secondary distribution entity are determined the transmitting time of secondary distribution entity according to the transmission time information of receiving;
B2, secondary distribution entity add that with the transmission time information of receiving a time delay obtains the transmitting time of transceiver, and on the transmitting time of the secondary distribution entity of determining it are continued to be distributed to each transceiver with described BroadCast MultiCast Service stream.
Described step B1 comprises:
The secondary distribution entity judges whether the current time has surpassed the transmission time information of receiving, if then abandon described BroadCast MultiCast Service stream, and the described time delay of steps A adjusted, otherwise, with the transmission time information received transmitting time as the secondary distribution entity.
Described step C comprises:
After transceiver is received described BroadCast MultiCast Service stream, judge whether the current time has surpassed the transmitting time of the transceiver of receiving, if, then abandon described BroadCast MultiCast Service stream, and the described time delay of step B2 adjusted, otherwise, the BroadCast MultiCast Service stream of receiving is sent on the transmitting time of described transceiver.
Described step C also comprises:
After transceiver is received described BroadCast MultiCast Service stream, the transmitting time of described transceiver is deducted gained time value behind the lead send latest time as the execution of transceiver.
Described steps A comprises:
The one-level distribution entity adds according to the time that receives BroadCast MultiCast Service stream and measures the time of delay of setting, directly calculates the transmitting time of transceiver, and send to the secondary distribution entity;
Described step B comprises:
The secondary distribution entity directly is distributed to each transceiver in real time with transmission time information and the BroadCast MultiCast Service stream of receiving;
And described step C comprises:
Each transceiver sends the BroadCast MultiCast Service stream of receiving on described transmitting time.
The method of described realization wireless broadcast multicast service synchronized transmission also comprises, when deal with data happens suddenly:
The one-level distribution entity adds described transmission time information the shake time delay of setting;
Perhaps,
Transceiver adds self-adjusting shake time delay with the transmitting time of definite transceiver.
The method of described realization wireless broadcast multicast service synchronized transmission also comprises:
When deal with data postponed, if when back data of calculate determining are unwrapped the frame number of the last frame that the frame number that send of starting sends greater than previous packet, then back data wrap in to be calculated the frame number of determining that begins to send and begins to send.
As seen from the above technical solution provided by the invention, because the present invention has adopted the mode of multistage distribution to realize the synchronized transmission of each Cell Broadcast CB multicast service, thereby the present invention has the following advantages:
1, adopts the mode of multistage transmission, make first time of reception that receives the transceiver of packet reduce, send synchronous realization thereby be convenient to BroadCast MultiCast Service with the time of reception difference that last receives the transceiver of packet;
2, multistage distribution BroadCast MultiCast Service can be shared the processing of broadcast multicast service data bag and the load of distribution respectively by a plurality of classification entities (as the secondary distribution entity), has further guaranteed synchronous reliability.
Description of drawings
Fig. 1 is the cellular mobile communication structural representation;
Fig. 2 is the process schematic diagram of existing BroadCast MultiCast Service synchronized transmission;
Fig. 3 is the process schematic diagram that BroadCast MultiCast Service provided by the invention sends;
Fig. 4 receives the process data packet schematic diagram for distribution entity;
Fig. 5 is the flow chart of method of the present invention.
Embodiment
Core of the present invention is to adopt the mode of multistage distribution BroadCast MultiCast Service stream to realize the synchronized transmission that BroadCast MultiCast Service flows in the respective regions, to guarantee in bigger zone, can realize the synchronized transmission of wireless broadcast multicast service at more distribution branch.
The invention provides a kind of system and method for realizing the wireless broadcast multicast service synchronized transmission.For ease of further understanding the present invention, describe respectively below in conjunction with the specific implementation of accompanying drawing to system and method for the present invention.
The specific implementation of system of the present invention specifically comprises as shown in Figure 3:
One-level distribution entity, a plurality of intergrade distribution entity and a plurality of transceiver;
Wherein, corresponding a plurality of intergrade distribution entity under the one-level distribution entity, corresponding again a plurality of transceivers under each intergrade distribution entity;
Described one-level distribution entity sends to each intergrade distribution entity with BroadCast MultiCast Service and transmission time information, and sends to each transceiver by each intergrade distribution entity;
Afterwards, determine the time and the transmission of synchronized transmission BroadCast MultiCast Service message according to the information of receiving by each transceiver.
In the system of the present invention, described one-level distribution entity and a plurality of intergrade distribution entity are arranged at respectively in the network entity of cordless communication network, as the PCF in the cdma system (Packet Control Function unit) entity, BSC (base station controller) entity etc.; And described intergrade distribution entity can be a secondary distribution entity of single-stage, perhaps is multistage a plurality of distribution entity.
The present invention can be implemented in the synchronized transmission of the BroadCast MultiCast Service of all honeycombs within the one-level distribution entity scope.Be placed on the different network entities by the one-level distribution entity, it is synchronous to satisfy the transmission that guarantees BroadCast MultiCast Service in the different range of cordless communication network.Such as, the one-level distribution entity is put on the PCF of CDMA2000, just can make being met synchronously of the interior broadcast multi-broadcasting of a PCF scope.That is to say, need to be provided with an one-level distribution entity in the zone for needs assurance wireless broadcast multicast service synchronized transmission.Certainly, one-level distribution entity past more upper strata in cordless communication network is provided with, and the retaining zone that can cover is just big more, and is simultaneously, also just high more to the requirement of one-level distribution entity; Do not carry out soft merging according to sub-district between the different B SC of current C DMA2000 EV DO (CDMA data-optimized systems) system, therefore, can go up one-level distribution entity of configuration by a BSC, so just can satisfy whole radio communication.
Be that a secondary distribution entity of single-stage is an example with the intergrade distribution entity more below, the specific implementation that the invention provides the method that realizes the wireless broadcast multicast service synchronized transmission is described, as Fig. 3, Fig. 4 and shown in Figure 5, described method specifically comprises:
Step 51: after the one-level distribution entity receives BroadCast MultiCast Service stream packets (hereinafter to be referred as packet), one-level distribution entity inquiry current system time T1; And after adding a time delay D1, obtain transmission time information T2=T1+D1;
In cdma system, the described current time in system can be a gps time;
Described T2 is used for notifying the secondary distribution entity time that packet sends on the secondary distribution entity;
Described time delay D1 is artificial or configuration automatically.
Step 52: the one-level distribution entity sends to described transmission time information T2 and packet all secondary distribution entity of its correspondence together.
Step 53: after each secondary distribution entity receives described packet respectively, inquiry current system time T3.
Step 54: the time T 2 that the secondary distribution entity is carried time T 3 and packet relatively judges promptly whether T3 has surpassed T2, if T3 has surpassed T2, then execution in step 55, otherwise, execution in step 56;
Step 55: the time of determining the secondary distribution entity transmission packet that the one-level distribution entity is indicated is over and done with, so this packet can not send again, therefore need abandon this packet;
Usually because described time delay D1 is provided with less than normally, thereby can alarm, in this case so that the size of manual setting time delay D1.
Step 56: if T3 does not surpass T2, then begin constantly at T2, the secondary distribution entity sends to all corresponding transceivers together with the transmitting time of described packet and transceiver;
The transmitting time of described transceiver is: add a time delay D2 on the transmitting time T2 basis of secondary distribution entity, promptly transceiver is at the time T 4=T2+D2 that eats dishes without rice or wine to send, and described T4 and packet send to transceiver together.
Step 57: after transceiver receives packet, inquire about current system time T5 earlier;
Step 58: utilize T4 to deduct one and send lead A1, be the transmitting time T6=T4-A1 of transceiver, described lead A1 is processing time in the early stage amount that transceiver sends the BroadCast MultiCast Service message, and T6 is that transceiver is carried out the latest time that sends packet;
Step 59: compare T6 and current system time T5, judge whether T5 has surpassed T6, if T5 has surpassed T6, then execution in step 510, otherwise, execution in step 511;
Step 510: the broadcast multicast service data bag transmitting time T4 that determines the indication of secondary distribution entity is over and done with, at this moment packet discard;
Description time retardation D2 is provided with less than normally under this situation, can alarm, so that manual or adjust time delay D2 automatically;
Step 511: if T5 does not surpass T6, then can described broadcast multicast service data bag be sent at the moment T6 that determines, described packet has utilized the preparation before the A1 time sends to handle on the basis of time T 6, and sends in the T6+A1 time; And because T6+A1=T4, promptly packet sent on time in the T4 time.
In the described step 58, the A1 of each transceiver needn't be identical, arrived transceiver as long as satisfy packet before T6, just can guarantee synchronously because transceiver packet be actual be to send at T4.
In the described method of the invention described above, in fact described secondary distribution entity can just can be transmitted to transceiver with packet, rather than send in the time T 2 of appointment again after receive packet immediately.This is because the actual transmitting time of T4 that in fact carries and secondary distribution entity is irrelevant, and only relevant with time T 2, thereby it is synchronous to handle the transmission that also can not have influence on transceiver like this.
If the secondary distribution entity is directly transmitted after receiving packet, then in transceiver, can adopt the one-level distribution entity in packet, directly to calculate the transmitting time T4=T1+D3 of transceiver, D3=D1+D2 like this, need not calculate forward delay interval on the secondary distribution entity; But the result of making has been put into the buffer memory that two-stage sends on the transceiver like this, to the buffer memory pressure increasing of transceiver.Therefore, the mode of the buffer memory of classification is adopted in suggestion among the present invention, shares the buffer memory pressure of transceiver.But protection scope of the present invention is not limited to this.
The problem that the present invention also exists needs to consider in the specific implementation process, that is exactly to the influence of synchronizing process when one-level distribution entity reception broadcast multicast service data bag is inhomogeneous.
First influence is that data send burst, and this processing method is specific as follows:
As shown in Figure 4, the packet schematic diagram that the one-level distribution entity receives, under normal circumstances, the transmitting time T4=Ti+D1+D2 of each packet on transceiver (packet1, packet2, packet3, packet4); Yet, when data happen suddenly, be packet 1, the packet 2 that transceiver receives, if the T4 according to packet sends, after the T4 time of finding packet 1 begins to send packet 1, its system time has surpassed the transmitting time T4 moment of packet 2, and Here it is because the data flow burst causes.
For addressing the above problem, the present invention can adopt dual mode:
(1) carries out the time delays adjustment in the one-level distribution entity according to the transmitting capacity of eating dishes without rice or wine, on T2, add a shake time delay;
The shortcoming of this mode is that the one-level distribution entity need be known the dispatching algorithm of eating dishes without rice or wine, and control is got up cumbersome.
(2) carry out the time delay adjustment according to the transmission situation of eating dishes without rice or wine automatically by transceiver, on T4, add a shake time delay, promptly adopt this method to avoid this type of problem such as CDMA 2000 1X or CDMA EV DO (CDMA data-optimized systems).
Therefore, the present invention advises the mode that employing mode (2) provides, but protection scope of the present invention is not limited to this.To be elaborated to mode (2) below, below for to illustrate accordingly by CDMA EV DO technology:
CDMA EV DO technology is sending BroadCast MultiCast Service employing BMAC (broadcasting MAC bag) frame format transmission, the transmitting time that on behalf of broadcasting service, the PlD of BMAC frame (group character, i.e. frame number) can eat dishes without rice or wine;
Suppose the confidential transmission packet of transceiver packet1, packet2, just packet1 is very long or to send time t1, t2 time difference of two data too little because data send burst reality, transceiver is when sending packet1 so, the packet1 that calculates is at first broadcasting frame number: PlD1=T4 * R/1002=(t1+D) * R/1002 of the transmission of eating dishes without rice or wine, here R is the transmission rate (bps of unit) of eating dishes without rice or wine, then need PID1, PID1+1 ..., send this packet on N such as the PID1+N-1 broadcast frame; Transceiver calculates PID2=T4 * R/1002=(t2+D) * R/1002 of packet2.If PID2 is less than PID1+N-1, then transceiver is that the broadcast frame of PID1+N begins to send at the broadcasting frame number; In fact packet2 is equivalent to add when transceiver sends packet2 shake time delay=(PID1+N-PID2) * 1002/R like this.Need to prove in addition: because the influence that all transceivers that data burst is given this one-level branch produce all is identical, this is because the transmitting time T4 of packet on transceiver is identical to all transceivers, thereby, as long as the shake of all transceivers time-delay algorithm is identical, the shake time delay of all transceivers also will be identical so.
Therefore, under the data burst situation, use this automatic shake time-delay will can not influence synchronous that classification sends to the transmitting time adjustment of transceiver.
It is to produce transmission lag that the one-level distribution entity receives inhomogeneous another influence of broadcast multicast service data bag, and this processing method is specific as follows:
As shown in Figure 4, the packet schematic diagram that the one-level distribution entity receives, the transmitting time T4=Ti+D1+D2 of each packet on transceiver (packet1, packet2, packet3, packet4); Suppose the confidential transmission packet of transceiver packet1, packet2, because a back packet transmission lag, the time t1, the t2 time difference that just receive two data are bigger than normal.The packet1 that this moment, transceiver calculated is at first broadcasting frame number: PID1=T4 * R/1002=(t1+D) * R/1002 of the transmission of eating dishes without rice or wine, here R is the transmission rate (bps of unit) of eating dishes without rice or wine, confirm that packets need is at PID1, PID1+1, ..., send this packet on N such as the PID1+N-1 broadcast frame, and transceiver calculates first broadcasting frame number: PID2=T4 * R/1002=(t2+D) * R/1002 that packet2 is eating dishes without rice or wine to send, if PID2 is greater than PID1+N, then transceiver still begins to send on the PID2 frame, and on the frame on the PID1+N, do not begin to send, do not adopt automatic shake time delay.Such benefit is that transceiver is adjusted time delay automatically when only happening suddenly, and under other situations, transceiver sent in strict accordance with the time of the T4 of secondary distribution entity indication, made transceiver the build-up effect of time delay can not occur shaking automatically.If transceiver uses automatic adjustment time delay from start to finish, ought mail to a data packet discarding of certain transceiver so, this transceiver is just had no chance to adjust with other transceivers and has been sent synchronously again so.And this method can send with other base station this base station of very fast adjustment again synchronously.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (13)
1, a kind of system that realizes the wireless broadcast multicast service synchronized transmission is characterized in that, comprising: one-level distribution entity, a plurality of intergrade distribution entity and a plurality of transceiver; Described one-level distribution entity sends to each intergrade distribution entity with BroadCast MultiCast Service and transmission time information, and send to each transceiver by each intergrade distribution entity, afterwards, determine the time and the transmission of synchronized transmission BroadCast MultiCast Service message according to the information of receiving by each transceiver.
2, the system of realization wireless broadcast multicast service synchronized transmission according to claim 1, it is characterized in that, described one-level distribution entity and a plurality of intergrade distribution entity are arranged at respectively in the network entity of cordless communication network, and described intergrade distribution entity can be a secondary distribution entity of single-stage, perhaps multistage a plurality of distribution entity.
3, a kind of method that realizes the wireless broadcast multicast service synchronized transmission is characterized in that, comprising:
A, the one-level distribution entity in wireless communication system send to each intergrade distribution entity respectively with BroadCast MultiCast Service stream and transmission time information;
B, intergrade distribution entity obtain described BroadCast MultiCast Service stream and transmission time information, and continue to be distributed to respectively each transceiver;
C, each transceiver are sent the BroadCast MultiCast Service stream of receiving according to the intergrade distribution entity information is determined transmitting time, and sends processing.
4, the method for realization wireless broadcast multicast service synchronized transmission according to claim 3 is characterized in that, described steps A also comprises:
In wireless communication system, need to realize in the zone of BroadCast MultiCast Service synchronized transmission an one-level distribution entity only to be set, and described one-level distribution entity is arranged on the network entity in the described zone.
5, the method for realization wireless broadcast multicast service synchronized transmission according to claim 3 is characterized in that, described transmission time information comprises:
The temporal information of the transmission BroadCast MultiCast Service stream that the intergrade distribution entity is calculated.
6, according to the method for claim 3,4 or 5 described realization wireless broadcast multicast service synchronized transmissions, it is characterized in that described steps A comprises:
One-level distribution entity in wireless communication system adds that according to the current time in system corresponding time delay obtains the transmission time information that the secondary distribution entity sends BroadCast MultiCast Service stream;
Described transmission time information is sent to each secondary distribution entity respectively with the BroadCast MultiCast Service stream of receiving.
7, the method for realization wireless broadcast multicast service synchronized transmission according to claim 6 is characterized in that, described step B comprises:
B1, secondary distribution entity are determined the transmitting time of secondary distribution entity according to the transmission time information of receiving;
B2, secondary distribution entity add that with the transmission time information of receiving a time delay obtains the transmitting time of transceiver, and on the transmitting time of the secondary distribution entity of determining it are continued to be distributed to each transceiver with described BroadCast MultiCast Service stream.
8, the method for realization wireless broadcast multicast service synchronized transmission according to claim 7 is characterized in that, described step B1 comprises:
The secondary distribution entity judges whether the current time has surpassed the transmission time information of receiving, if then abandon described BroadCast MultiCast Service stream, and the described time delay of steps A adjusted, otherwise, with the transmission time information received transmitting time as the secondary distribution entity.
9, the method for realization wireless broadcast multicast service synchronized transmission according to claim 7 is characterized in that, described step C comprises:
After transceiver is received described BroadCast MultiCast Service stream, judge whether the current time has surpassed the transmitting time of the transceiver of receiving, if, then abandon described BroadCast MultiCast Service stream, and the described time delay of step B2 adjusted, otherwise, the BroadCast MultiCast Service stream of receiving is sent on the transmitting time of described transceiver.
10, the method for realization wireless broadcast multicast service synchronized transmission according to claim 7 is characterized in that, described step C also comprises:
After transceiver is received described BroadCast MultiCast Service stream, the transmitting time of described transceiver is deducted gained time value behind the lead send latest time as the execution of transceiver.
11, according to the method for claim 3,4 or 5 described realization wireless broadcast multicast service synchronized transmissions, it is characterized in that described steps A comprises:
The one-level distribution entity adds according to the time that receives BroadCast MultiCast Service stream and measures the time of delay of setting, directly calculates the transmitting time of transceiver, and send to the secondary distribution entity;
Described step B comprises:
The secondary distribution entity directly is distributed to each transceiver in real time with transmission time information and the BroadCast MultiCast Service stream of receiving;
And described step C comprises:
Each transceiver sends the BroadCast MultiCast Service stream of receiving on described transmitting time.
According to the method for claim 3,4 or 5 described realization wireless broadcast multicast service synchronized transmissions, it is characterized in that 12, this method also comprises, when deal with data happens suddenly:
The one-level distribution entity adds described transmission time information the shake time delay of setting;
Perhaps,
Transceiver adds self-adjusting shake time delay with the transmitting time of definite transceiver.
13, according to the method for claim 3,4 or 5 described realization wireless broadcast multicast service synchronized transmissions, it is characterized in that this method also comprises:
When deal with data postponed, if when back data of calculate determining are unwrapped the frame number of the last frame that the frame number that send of starting sends greater than previous packet, then back data wrap in to be calculated the frame number of determining that begins to send and begins to send.
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| CN101370156B (en) * | 2007-08-15 | 2012-05-23 | 上海华为技术有限公司 | Method and network system for multicast service transmission |
| CN101394293B (en) * | 2007-09-19 | 2011-07-13 | 中兴通讯股份有限公司 | System for implementing broadcast data full network synchronization |
| CN101488799B (en) * | 2008-01-17 | 2013-01-23 | 中兴通讯股份有限公司 | Method for data transmission synchronization between radio network controllers |
| CN101499870B (en) * | 2008-02-03 | 2013-01-16 | 中兴通讯股份有限公司 | Method and apparatus for multimedia broadcast multicast service data synchronization between RNCs |
| WO2010012230A1 (en) * | 2008-08-01 | 2010-02-04 | 华为技术有限公司 | Data synchronization method and device |
| US8498231B2 (en) | 2008-08-05 | 2013-07-30 | Industrial Technology Research Institute | System and method for multicast and broadcast service synchronization |
| CN113543039A (en) * | 2020-04-22 | 2021-10-22 | 成都鼎桥通信技术有限公司 | Multicast signal sending method and equipment |
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| CN100450199C (en) | 2009-01-07 |
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