CN100583693C - Method and system for realizing empty port synchronous emitting data - Google Patents

Method and system for realizing empty port synchronous emitting data Download PDF

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CN100583693C
CN100583693C CN200510137433A CN200510137433A CN100583693C CN 100583693 C CN100583693 C CN 100583693C CN 200510137433 A CN200510137433 A CN 200510137433A CN 200510137433 A CN200510137433 A CN 200510137433A CN 100583693 C CN100583693 C CN 100583693C
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tti
frame number
time interval
transmission time
network controller
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CN1852049A (en
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胡军
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

This invention discloses a method for realizing empty synchronization including: a radio network controller gets a time deviation between its frame number and the connection frame numbers of the front access channels of the areas based on the synchronized process of transmission channels, thus, the time delay difference among different areas is less than half transmission time interval based on the deviation and the offset volume of the transmission time interval is got. This invention also discloses a method and a system for realizing empty synchronous data sending.

Description

A kind of method and system of realizing empty pont synchronous emitting data
Technical field
The present invention relates to a kind of communication technology, relate in particular to a kind of method and system of realizing empty pont synchronous emitting data.
Background technology
Along with the communication service development, the application of MBMS business is also more and more wider, people are also high more to the requirement of MBMS quality of service, when being in cell edge when moving of UE (user terminal), owing to may need to switch in this zone, when switching, need therefore, fluctuate maximum according to the signal of sub-district in the bearing mode of eating dishes without rice or wine to adopt (as PTP carrying or PTM carrying) merger activity sub-district at the signal quality that this regional UE received.
In the prior art, can support the soft handover function when MBMS (BroadCast MultiCast Service) is professional when eating dishes without rice or wine to adopt PTP (point-to-point) carrying, the same user's of different districts descending PTP carrying can realize soft merging.When the MBMS business when eating dishes without rice or wine to adopt PTM (putting multiple spot) carrying, can support the soft merging of neighbor cell same MBMS business, described sub-district belongs to same cell set, and belongs to same RNC (radio network controller).When utilizing PTM carrying MBMS professional, same PDCP (PDCP) and UM RLC (control of Unacknowledged Mode Radio Link) entity are shared in each sub-district in the same cell set.UE (user terminal) receives the same MBMS business from each sub-district PTM carrying, realizes soft merging according to the UE side that is configured in of RNC.The described soft log-likelihood ratio (LLR) of merging into merges, and carries out at a transmission channel, and the transport channel data that is used for each sub-district of soft merging must be in full accord.Unified again decoding after data merge before the decoding of each sub-district.The maximum delay difference of the identical data arrival UE of each sub-district is not more than 1TTI when soft the merging, so network side must satisfy the requirement of each sub-district synchronized transmission in the cell set when sending the MBMS business datum.The synchronizing process of descending transmission channel is described below.
As shown in Figure 1, in step 10, RNC (radio network controller) sends DL SYNCHRONISATION (downlink synchronization) control frame for Node B (base station), initiates synchronizing process, comprises target CFN (Connection Frame Number) in the control frame.In step 20, after Node B receives control frame from RNC, calculate the actual deviation between constantly of moment of receiving this control frame and target CFN, this deviation is ToA (time of advent).Node B sends UL SYNCHRONISATION (uplink synchronisation) control frame to RNC, comprises the target CFN in ToA and the DL SYNCHRONISATION control frame in the control frame.
In the prior art, also not how in MBMS when supporting soft mergings, how to reach the synchronized transmission of the MBMS business of the interior different districts of cell set.
Summary of the invention
The purpose of this invention is to provide a kind of method and system of realizing empty pont synchronous emitting data, can realize the synchronized transmission of the MBMS business of different districts in the cell set.
The invention discloses a kind of method that realizes air interface synchronization, comprising:
A, radio network controller be by the transport channel synchronization process, obtains the time deviation T between the Connection Frame Number of the radio network controller frame number of radio network controller and each cell forward access channel DiffTotal
B1, by described time deviation T DiffTotalObtain departure T in the Transmission Time Interval Diff
B2, according to T DiffAdjust the skew of the relative radio network controller frame number of Connection Frame Number of forward access channel, make delay inequality between the different districts less than half Transmission Time Interval, and obtain departure OFF*T between Transmission Time Interval TTI
Wherein, T Diff=T DiffTotalMod T TTI,
T TTILength for Transmission Time Interval;
OFF＝(T DiffTotal-T Diff)/T TTI。
Described step B2 specifically comprises: if T DiffScope is 0 to T TTIBetween/2, the Connection Frame Number of getting forward access channel is T with respect to the deviation of radio network controller frame number TTI, rebulid the forward access channel of this sub-district at/2 o'clock.
The described scheduled time is half Transmission Time Interval.
The invention also discloses a kind of method that realizes empty pont synchronous emitting data, comprising:
C, radio network controller are determined each transport block set that sends;
D, determined transport block set is added timestamp RFN_Ct;
The broadcast multi-broadcasting media access control dispatching unit of E, cell i is (RFN_Ct-OFFi*N at Connection Frame Number TTI) be engraved in during mod 256 and send described transport block set on the forward access channel; OFFi*N wherein TTIBe departure between the Transmission Time Interval of cell i;
Wherein, described timestamp is (RFN_C+ (N TTI* ND Elay)) mod 256;
RFN_C is RFN mod 256, and RFN is the frame number of radio network controller;
(N TTI* N Delay) represent that this transport block set is combined in current time and postpones N DelayOn forward access channel, send N behind the individual Transmission Time Interval DelayBe a constant, N TTIBe the radio frames number that a Transmission Time Interval can transmit, value T TTI/ T Frame
T Diff=T DiffTotalMod T TTI, T TTIBe the length of Transmission Time Interval, T DiffTotalBe the time deviation between the Connection Frame Number of radio network controller frame number and each cell forward access channel;
OFF＝(T DiffTotal-T Diff)/T TTI。
The invention also discloses a kind of system that realizes empty pont synchronous emitting data, comprising:
Radio network controller is used for initiating synchronizing process to the base station, and according to from departure OFF*T between the Connection Frame Number of each cell forward access channel of base station and the acquisition of the time deviation between radio network controller frame number Transmission Time Interval TTIWith departure T in the Transmission Time Interval Diff, and according to departure T in the described Transmission Time Interval DiffAdjust the skew of the relative radio network controller frame number of Connection Frame Number of forward access channel, make delay inequality between the different districts less than half Transmission Time Interval, according to departure OFF*T between Transmission Time Interval TTISend data;
Wherein, T Diff=T DiffTotalMod T TTI,
T TTILength for Transmission Time Interval;
OFF＝(T DiffTotal-T Diff)/T TTI；
The base station is used to obtain the Connection Frame Number of cell forward access channel and the time deviation T between the radio network controller frame number DiffTotal, and this time deviation issued radio network controller.
According to the present invention, can realize that the same MBMS service data of different districts should be greater than T in the delay inequality of each sub-district transmission TTI/ 2.Thereby make MBMS business each sub-district synchronized transmission in a cell set, satisfy the delay inequality restriction of soft merging.
Description of drawings
Fig. 1 shows the synchronous flow chart of descending transmission channel;
Fig. 2 shows the schematic diagram that concerns between the RFN of the embodiment of the invention and the CFN;
Fig. 3 shows the synchronizing process of the RNC transmission MBMS business datum of the embodiment of the invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.
Basic thought of the present invention is, RNC obtains RNC by the transport channel synchronization process RFN (RNC frame number) and each sub-district send the time migration between the CFN of FACH (forward access channel) of MBMS business, utilize the synchronized transmission of this time migration realization MBMS business each sub-district in RNC then.
The application's description for convenience, it is as follows to define each symbol:
T FrameBe radio frames length, value 10ms.
RFN is the RNC frame number, and span is 0 to 4095; Definition RFN_C is RFN mod 256, and then the RFN_C span is 0 to 255.
CFN is the FACH frame number, and span is 0 to 255.
T 256Be the repetition period of RFN_C, CFN, value is 256*T FrameEqual 2560ms.
T TTIBe TTI length, value is generally 80ms or 40ms.
N TTIBe the radio frames number that a TTI can transmit, value T TTI/ T Frame
The time migration relation of obtaining between RFN and the CFN is described below, supposes that CFN is 0 millisecond with respect to the deviation of SFN (System Frame Number also claims the sub-district frame number), after the FACH of each sub-district set up, RNC initiated the FACH channel synchronization process of each sub-district.
Fig. 2 shows the schematic diagram that concerns between RFN and the CFN; As shown in Figure 2, RNC sends DL SYNCHRONISATION control frame to Node B in the moment of RFN_Cr, wherein, supposes that the CFN value in the control frame is 0.Suppose that now control frame does not have transmission delay between RNC and NodeB, the CFN that NodeB calculates the moment receive DL SYNCHRONISATION control frame and FACH is that the time deviation between moment of 0 is ToA, send UL SYNCHRONISATION control frame then to RNC, comprise ToA in the described control frame.
After RNC obtained ToA, the CFN of calculating FACH with respect to the time deviation of the RFN_C of RNC was:
T DiffTotal＝(RFN_Cr*T Frame+ToA)mod?T 256
According to T DiffTotalCan obtain following two parameters:
T Diff＝T DiffTotal?mod?T TTI
OFF＝(T DiffTotal-T Diff)/T TTI
To know that by above-mentioned formula the time deviation between CFN and the RFN_C is T DiffTotal, comprise two parts: departure OFF*T between Transmission Time Interval TTIWith departure T in the Transmission Time Interval DiffWherein, T DiffSpan 0 to T TTIBetween.According to the present invention, if T DiffScope 0 to T TTIBetween/2, the CFN that gets FACH is T with respect to the deviation of RFN TTI/ 2, rebulid the FACH channel of this sub-district.At last can be so that the T of all sub-districts DiffSpan at T TTI/ 2 to T TTIBetween, and obtaining the OFF of each sub-district, OFF shows the frame for wireless transmission time interval number that differs between CFN and the RFN_C.
The synchronizing process that RNC sends the MBMS business datum is described below.
Step 1, RNC obtain the MBMS business datum from SGSN (Serving GPRS Support Node).
Step 2, the MBMS business datum that obtains is placed in the RNC buffer memory.
Step 3, the PDCP/RLC protocol processing unit of sharing are handled the MBMS business datum, finish PDCP compression function and rlc protocol and handle, the MBMS business datum is cut apart reassemble into a plurality of transmission blocks,
Step 4, a plurality of transmission blocks that will form are placed in the scheduling buffer memory.
Step 5, transmission scheduling unit carry out a secondary data every a transmission time interval (1TTI) and send scheduling, promptly at each RFN_C modN TTIBe that 0 pairing RFN_Ct sends scheduling constantly.If the number of data blocks in the current cache greater than the maximum data piece number that once can send, is selected the data block of maximum number, otherwise select all data blocks in the current cache.The transmission block that this time sends scheduling to be needed to send is a transport block set, and this transport block set is added transmitting time stamp RFN_Ct, and RFN_Ct is (RFN_C+ (N TTI* N Delay)) mod 256, wherein (N TTI* N Delay) represent that this transport block set is combined in current time and postpones N DelayOn FACH, send N behind the individual TTI DelayIt is a constant.Send scheduling unit this data block set is distributed in MACm (access control of the broadcast multi-broadcasting medium) buffer memory of each sub-district among the RNC, so that the MACm scheduling unit postpones N DelayIndividual TTI distributing data set of blocks.
The MACm buffer memory of step 6, sub-district sends the data block that scheduling unit is sent.
The MACm scheduling unit of each sub-district is (RFN_Ct-OFFi*N at CFN among step 7-8, the RNC TTI) be engraved in during mod 256 and send this transport block set, wherein OFFi*T on the FACH channel TTIBe departure between the Transmission Time Interval of cell i.
The invention also discloses a kind of system that realizes empty pont synchronous emitting data, comprise: radio network controller, be used for initiating synchronizing process to the base station, and according to from departure OFF*T between the Connection Frame Number of each cell forward access channel of base station and the acquisition of the time deviation between radio network controller frame number Transmission Time Interval TTIWith departure T in the Transmission Time Interval Diff, and according to departure T in the described Transmission Time Interval DiffMake delay inequality between the different districts less than half Transmission Time Interval, according to departure OFF*T between Transmission Time Interval TTISend data; The base station is used to obtain the Connection Frame Number of cell forward access channel and the time deviation between the radio network controller frame number, and this time deviation is issued radio network controller.
Should be noted that according to the present invention the delay inequality between the different districts gets final product less than half Transmission Time Interval, but delay inequality is more little, the synchronous effect between each sub-district is good more.
According to the present invention, can realize that the same MBMS service data of different districts should be greater than T in the delay inequality of each sub-district transmission TTI/ 2.Thereby make MBMS business each sub-district synchronized transmission in a cell set, satisfy the delay inequality restriction of soft merging.
Though described the present invention by embodiment, those of ordinary skills know, under the situation that does not break away from god of the present invention and essence, just can make the present invention that many distortion and variation are arranged, and scope of the present invention is limited to the appended claims.

Claims (5)

1, a kind of method that realizes air interface synchronization is characterized in that, comprising:
A, radio network controller be by the transport channel synchronization process, obtains the time deviation T between the Connection Frame Number of the radio network controller frame number of radio network controller and each cell forward access channel DiffTotal
B1, by described time deviation T DiffTotalObtain departure T in the Transmission Time Interval Diff
B2, according to T DiffThe skew of the relative radio network controller frame number of Connection Frame Number of whole forward access channel makes delay inequality between the different districts less than half Transmission Time Interval, and obtains departure OFF*T between Transmission Time Interval TTI
Wherein, T Diff=T DiffTotalMod T TTI, T TTILength for Transmission Time Interval;
OFF＝(T DiffTotal-T Diff)/T TTI。
2, the method for realization air interface synchronization according to claim 1 is characterized in that, described step B2 specifically comprises: if T DiffScope is 0 to T TTIBetween/2, the Connection Frame Number of getting forward access channel is T with respect to the deviation of radio network controller frame number TTI, rebulid the forward access channel of this sub-district at/2 o'clock.
3, the method for realization air interface synchronization according to claim 1 and 2 is characterized in that, the described scheduled time is half Transmission Time Interval.
4, a kind of method that realizes empty pont synchronous emitting data is characterized in that, comprising:
C, radio network controller are determined each transport block set that sends;
D, determined transport block set is added timestamp RFN_Ct;
The broadcast multi-broadcasting media access control dispatching unit of E, cell i is (RFN_Ct-OFFi*N at Connection Frame Number TTI) be engraved in during mod 256 and send described transport block set on the forward access channel; OFFi*N wherein TTIBe departure between the Transmission Time Interval of cell i;
Wherein, described timestamp is (RFN_C+ (N TTI* N Delay)) mod 256;
RFN_C is RFN mod 256, and RFN is the frame number of radio network controller;
(N TTI* N Delay) represent that this transport block set is combined in current time and postpones N DelayOn forward access channel, send N behind the individual Transmission Time Interval DelayBe a constant, N TTIBe the radio frames number that a Transmission Time Interval can transmit, value T TTI/ T Frame
T Diff=T DiffTotalMod T TTI, T TTIBe the length of Transmission Time Interval, T DiffTotalBe the time deviation between the Connection Frame Number of radio network controller frame number and each cell forward access channel;
OFF＝(T DiffTotal-T Diff)/T TTI。
5, a kind of system that realizes empty pont synchronous emitting data is characterized in that, comprising:
Radio network controller is used for initiating synchronizing process to the base station, and according to from departure OFF*T between the Connection Frame Number of each cell forward access channel of base station and the acquisition of the time deviation between radio network controller frame number Transmission Time Interval TTIWith departure T in the Transmission Time Interval Diff, and according to departure T in the described Transmission Time Interval DiffAdjust the skew of the relative radio network controller frame number of Connection Frame Number of forward access channel, make delay inequality between the different districts less than half Transmission Time Interval, according to departure OFF*T between Transmission Time Interval TTISend data;
Wherein, T Diff=T DiffTotalMod T TTI, T TTILength for Transmission Time Interval;
OFF＝(T DiffTotal-T Diff)/T TTI；
The base station is used to obtain the Connection Frame Number of cell forward access channel and the time deviation T between the radio network controller frame number DiffTotal, and this time deviation issued radio network controller.
CN200510137433A 2005-12-30 2005-12-30 Method and system for realizing empty port synchronous emitting data Expired - Fee Related CN100583693C (en)

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CN101262634B (en) * 2007-03-05 2012-09-05 中兴通讯股份有限公司 Transmission method for multimedia broadcast and multicast service in TD-SCDMA system
CN101051889B (en) * 2007-03-23 2011-08-24 中兴通讯股份有限公司 Method and system for realizing service data consistence between network controllers
CN101043265B (en) * 2007-04-27 2010-11-24 华为技术有限公司 Method for realizing multimedia broadcasting and multicasting service data synchronized transmission
CN101299822B (en) * 2007-04-30 2012-07-04 华为技术有限公司 System, method, equipment and apparatus for synchronous transmission
CN101360282B (en) * 2007-07-31 2012-01-11 中兴通讯股份有限公司 Transmission method for multicast broadcast multimedia service
CN101370175B (en) * 2007-08-15 2011-12-28 华为技术有限公司 Method for determining data sending time, multicast grouping method, apparatus and system
CN101465745B (en) * 2007-12-19 2012-10-03 华为技术有限公司 Method, device and system for sending multicast and multicast business data
CN101572859A (en) * 2008-04-30 2009-11-04 中兴通讯股份有限公司 Synchronized method of common control information among network elements
RU2546198C1 (en) * 2011-02-15 2015-04-10 Телефонактиеболагет Л М Эрикссон (Пабл) Methods for time synchronisation in communication networks
CN103096480B (en) 2011-11-04 2016-12-21 华为技术有限公司 Determination method, base station and the radio network controller of Transmission Time Interval
WO2013067655A1 (en) * 2011-11-11 2013-05-16 Telefonaktiebolaget L M Ericsson (Publ) Sync interval determination
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WO2014037061A1 (en) 2012-09-06 2014-03-13 Telefonaktiebolaget L M Ericsson (Publ) Use of common public radio interface over asymmetric networks

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