CN101051864B - Synchronizing method for realizing RLC sequence number between RNC for MBMS service - Google Patents
Synchronizing method for realizing RLC sequence number between RNC for MBMS service Download PDFInfo
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- CN101051864B CN101051864B CN200710086955A CN200710086955A CN101051864B CN 101051864 B CN101051864 B CN 101051864B CN 200710086955 A CN200710086955 A CN 200710086955A CN 200710086955 A CN200710086955 A CN 200710086955A CN 101051864 B CN101051864 B CN 101051864B
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Abstract
The method includes steps: step 102, message source outputs service data packet (SDP), and marking transmitting sequence number (TSN) for SDP; step 104, after receiving SDP, wireless network controller reads out TSN; step 106, wireless network controller carries out wireless link control banding for SDP, and based on TSN to determine sequence number of wireless link control band. The invention realizes synchronization of RLC sequence number between RNCs. Thus, even if in condition of packet loss, sequence number in RLC layer of MBMS service data packet still keeps synchronization between RNCs.
Description
Technical field
The present invention relates to the communications field; Relate in particular to a kind of multimedia broadcast multicast services (multimedia broadcast/multicast service that is used for; Abbreviate MBMS as) business realization Radio Link control (radio link control; Abbreviate RLC as) sequence number synchronous method between radio network controller (radio network controller abbreviates RNC as).
Background technology
Now, people have no longer contented just to phone and messaging service for the demand of mobile communication, and along with the fast development of Internet net, a large amount of multimedia services emerge.For the some of them applied business, a plurality of users can receive identical data simultaneously, for example, and video request program, television broadcasting, video conference, online education, interactive game etc.
In order to realize utilizing most effectively mobile network resource, the MBMS technology has been proposed.The MBMS technology is that a data source is sent the point-to-multipoint service of data to a plurality of users, is used to realize that Internet resources are shared, comprises sharing of mobile core network and access network resource, and especially interface-free resources shares.The MBMS of 3GPP definition not only can realize the classes of messages multicast and the broadcasting of plain text low rate, can also realize the multimedia service multicast and the broadcasting of two-forty, and this has complied with following mobile data Development Trend undoubtedly.
As the technology that improves the professional availability of frequency spectrum of MBMS, SFN (singlefrequency network abbreviates SFN as) or chip-level merge all identical wireless signals of adjacent base station synchronized transmission of (Chip merging) specification requirement.
Under the SFN pattern; Subscriber equipment (user equipment; Abbreviate UE as) can the signal from different base station be regarded as multipath signal; Make public physic channel transmit broadcasting service and obtain bigger signal gain, thereby improved professional service quality (quality of service the abbreviates QoS as) performance of MBMS.Yet the introducing of this technology has brought new problem, that is, owing to be regarded as multipath from the signal of different base station by mobile phone, just require each footpath data must keep synchronized transmission.Under the Chip merging patterns, UE receives the service signal that different base station sends simultaneously, and realizes merging at chip-level through the multi-plot joint detection technique, and the MBMS service signal that this different districts that just requires UE to receive sends all is the same at same time slot.
Variation has taken place in the protocol stack of user plane after the 3GPP introducing MBMS; Radio network controller (radio network controller; Abbreviate RNC as) can be when the MBMS service carrier is set up according to core net service area (service area; Abbreviate SA as) tabulation, be organized into the cell set mode with affiliated subdistrict and set up shared PDCP (packet data convergence protocol abbreviates PDCP as) in a plurality of sub-districts and Radio Link control (radio link control; Abbreviate RLC as) entity; Medium access control (medium access control for MBMS abbreviates MAC-m as) and the Frame Protocol separately (frame protocol abbreviates FP as) of MBMS separately used in each sub-district.Wherein, RLC uses Unacknowledged Mode (unacknowledged mode abbreviates the UM pattern as).
The MBMS business is the service towards the whole network, and same MBMS business possibly be based upon on the different RNCs.Like this, the UE receiving gain is improved in order to utilize SFN or Chip folding in the sub-district between different RNCs, just needs and the identical MBMS business of cell synchronizing transmission of the adjacent R NC signal of eating dishes without rice or wine.Otherwise, belong to that signal can cause with disturbing frequently between the neighbor cell of different RNCs, perhaps UE can not get receiving gain.
Realizing that RLC belongs to the sub-district of the minizone of different RLC can the identical signal of eating dishes without rice or wine of synchronized transmission; Need to guarantee the consistency of business datum and agreement control packet header content; This just requires different RNC to guarantee that when realizing that RLC handles the RLC sequence number is synchronous, wants the identical RLC sequence number of mark to identical business data packet.
Realize in the scheme synchronous between the professional RNC of MBMS at a kind of core net mark timestamp that uses; Consider the possibility of Network Packet Loss, time-delay; If certain RNC does not receive business data packet in wanting seeking time; And other RNC has received this packet in the time that requires, and then according to the processing mode of existing protocol, the RLC sequence number that different RNCs is distributed will occur inconsistent.For example, the RLC sequence number that the RNC of packet loss distributes occurs and to lag behind the RNC that does not have packet loss.The difference of RLC sequence number can cause the professional relevant wireless signal of synchronization different, thereby makes that wireless signal is asynchronous between RNC.
Therefore, need a kind of RLC sequence number synchronous method between radio network controller that in the MBMS business, realizes.
Summary of the invention
Consider the problems referred to above that exist in the correlation technique and make the present invention that for this reason, main purpose of the present invention is to provide the synchronous scheme of a kind of MBMS of being used for business realization Radio Link control sequence number between radio network controller.
According to embodiments of the invention, the synchronous method of a kind of MBMS of being used for business realization Radio Link control sequence number between radio network controller is provided.
This method comprises: step S102, and information source outgoing traffic packet, and mark transmits Sequence Number in business data packet; Step S104, radio network controller receive after the business data packet, read to transmit Sequence Number; And step S106, radio network controller carries out Radio Link control burst to business data packet, and confirms the sequence number of each Radio Link control burst according to transmitting Sequence Number.
Before step S102, information source/radio network controller is known the maximum transmission length L of business data packet through the mode of configuration or signaling.Wherein, information source makes the length of business data packet send length L near maximum as far as possible when the outgoing traffic packet.Wherein, radio network controller can be known the maximum number N that sends the corresponding Radio Link control burst of length of business data packet through calculating or disposing.
Wherein, the span that transmits Sequence Number is for from 0 to predetermined maximum, unidirectional increasing progressively, when value behind predetermined maximum, information source is redistributed since 0.
In step S106, radio network controller is confirmed the sequence number P1 of first Radio Link control burst of above-mentioned business data packet according to following formula:
P1＝(N×S)％M；
Wherein, S is for transmitting Sequence Number, and N is the maximum number of sending the corresponding Radio Link control burst of length L of RNC business data packet, and the maximum that M equals Radio Link control sequence number adds 1.
From first sequence number P1 begin the corresponding sequence number Pi of follow-up i Radio Link control burst of this business data packet of continuous dispensing, wherein, Pi=(P1+i) %M, and i＞1.
In addition, after step S106, further comprise following processing: in wireless chain control layer is handled,, fill processing for Radio Link control (RLC) protocol Data Unit (PDU) that does not fill up.
Wherein, information source be following any: core net node, service node.
Through technical scheme of the present invention, realized the RLC sequence number between RNC synchronously, even make that MBMS business data packet rlc layer sequence number also can keep synchronous between RNC under the situation of packet loss.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart that is used for the method for synchronous of MBMS business realization Radio Link control (RLC) sequence number between radio network controller (RNC) that illustrates according to the embodiment of the invention; And
Fig. 2 is the flow chart that illustrates according to the instance that is used for the method for synchronous of MBMS business realization Radio Link control (RLC) sequence number between radio network controller (RNC) of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below with reference to accompanying drawings in detail.
In embodiments of the present invention, the synchronous method of a kind of MBMS of being used for business realization Radio Link control sequence number between radio network controller is provided; Fig. 1 is the flow chart that this method is shown.
With reference to Fig. 1, this method comprises: step S102, and information source outgoing traffic packet, and mark transmits Sequence Number in business data packet; Step S104, radio network controller receive after the business data packet, read to transmit Sequence Number; And step S106, radio network controller carries out Radio Link control burst to business data packet, and confirms the sequence number of each Radio Link control burst according to transmitting Sequence Number.
Wherein, information source be following any: core net node, service node.
Below through instantiation describe according to the embodiment of the invention be used for the synchronous method of MBMS business realization Radio Link control sequence number between radio network controller, wherein, Fig. 2 shows the detailed process flow chart of this instance.
At first, core network source can be known the maximum transmission length L of each outgoing traffic packet that MBMS is professional through configuration or signaling method.RNC can be known the maximum transmission length L of the business data packet that information source is sent through configuration or signaling method, and through calculating or dispose the RLC burst number N of knowing that this length data bag needs.
In step S202, information source is when the outgoing traffic packet, and length of data package is as much as possible near the maximum length L of sending, to improve channel transport efficiency.Here, the business datum packet length is meant the protocol definition according to MBMS, need send to the data length of subscriber equipment (userequipment abbreviates UE as).(corresponding to above-mentioned steps S102)
In step S204, information source mark information source in the outgoing traffic packet transmits Sequence Number.Wherein, the span that transmits Sequence Number increases progressively from 0 to certain particular value (that is, predetermined maximum) continuously, after arriving this particular value, distributes since 0 again.Each business datum information source that is responsible for assigning transmits Sequence Number.(corresponding to above-mentioned steps S102)
In step S206, RNC RLC entity receives RLC Service Data Unit (service data unit abbreviates SDU as) afterwards, reads in the business data packet information source of the mark S that transmits Sequence Number.(corresponding to above-mentioned steps S104)
RNC should satisfy condition for first RLC burst sequence number P1 that distributes behind this business datum packet fragmentation: and P1=(%M of N * S), wherein, M is that the maximum of RLC sequence number adds 1, N is the number of the RLC burst of the packets need of this maximum transmission length L.(corresponding to above-mentioned steps S106)
The sequence number that RNC counts the follow-up burst of bag to this business distributes as follows: Pi=(P1+i) %M, wherein Pi is the sequence number of i Radio Link control burst of this business data packet, and i＞1.
Then, in the rlc layer of RLC is handled, the RLC PDU that does not fill up is carried out RLC fill processing.
In sum, in technical scheme of the present invention since the mapping of the sequence number through the information source mark obtain the rlc layer sequence number, even make that MBMS business data packet rlc layer sequence number also can keep synchronous between RNC under the situation of packet loss.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a realization Radio Link control sequence that the is used for multimedia broadcast-multicast service synchronous method number between radio network controller is characterized in that, comprising:
Step S102, information source outgoing traffic packet, and mark transmits Sequence Number in said business data packet;
Step S104, radio network controller receive after the said business data packet, read said transmitting Sequence Number; And
Step S106, said radio network controller carries out Radio Link control burst to said business data packet, and confirms the sequence number of each Radio Link control burst according to said transmitting Sequence Number.
2. the synchronous method of the realization Radio Link control sequence that is used for multimedia broadcast-multicast service according to claim 1 number between radio network controller; It is characterized in that; Before said step S102, said information source/said radio network controller is known the maximum transmission length L of said business data packet through the mode of configuration or signaling.
3. the synchronous method of the realization Radio Link control sequence that is used for multimedia broadcast-multicast service according to claim 2 number between radio network controller; It is characterized in that; Said information source makes the length of said business data packet send length L near said maximum as far as possible when the said business data packet of output.
4. the synchronous method of the realization Radio Link control sequence that is used for multimedia broadcast-multicast service according to claim 1 number between radio network controller; It is characterized in that; The said span that transmits Sequence Number is to predetermined maximum from 0; Unidirectional increasing progressively, after value arrived said predetermined maximum, said information source was redistributed since 0.
5. the synchronous method of the realization Radio Link control sequence that is used for multimedia broadcast-multicast service according to claim 1 number between radio network controller; It is characterized in that; In said step S106, said radio network controller is confirmed the sequence number P1 of first Radio Link control burst according to following formula:
P1＝(N×S)％M；
Wherein, S is said transmitting Sequence Number, and N is the number that the maximum of said business data packet is sent the corresponding Radio Link control burst of length L, and the maximum that M equals Radio Link control sequence number adds 1.
6. the synchronous method of the realization Radio Link control sequence that is used for multimedia broadcast-multicast service according to claim 5 number between radio network controller; It is characterized in that said radio network controller is through calculating or dispose the said maximum number N that sends the corresponding said Radio Link control burst of length L of knowing said business data packet.
7. the synchronous method of the realization Radio Link control sequence that is used for multimedia broadcast-multicast service according to claim 5 number between radio network controller; It is characterized in that; Begin the corresponding sequence number Pi of follow-up i Radio Link control burst of the said business data packet of continuous dispensing from said first sequence number P1; Wherein, Pi=(P1+i) %M, and i＞1.
8. according to the synchronous method of each described realization Radio Link control sequence that is used for multimedia broadcast-multicast service in the claim 1 to 7 number between radio network controller, it is characterized in that, after said step S106, further comprise following processing:
In wireless chain control layer is handled,, fill processing for the wireless link control protocol data cell that does not fill up.
9. according to the synchronous method of each described realization Radio Link control sequence that is used for multimedia broadcast-multicast service in the claim 1 to 7 number between radio network controller; It is characterized in that, said information source be following any: core net node, service node.
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| CN101605300B (en) * | 2008-06-12 | 2013-02-27 | 上海寰创通信科技股份有限公司 | Reliable multicast system of wireless network and control method thereof |
| CN101651536A (en) | 2008-08-13 | 2010-02-17 | 中兴通讯股份有限公司 | Method and system for realizing synchronization of control sequence numbers |
| CN101651510B (en) * | 2008-08-14 | 2013-01-16 | 中兴通讯股份有限公司 | Method and device for recovery processing in service data synchronous transmission |
| KR101329543B1 (en) * | 2009-04-28 | 2013-11-15 | 알까뗄 루슨트 | A message transmission method and the corresponding device thereof |
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| CN1829187A (en) * | 2005-02-28 | 2006-09-06 | 华为技术有限公司 | Method for holding packet data protocol convergence sublayer sequence number synchronization |
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| CN1829187A (en) * | 2005-02-28 | 2006-09-06 | 华为技术有限公司 | Method for holding packet data protocol convergence sublayer sequence number synchronization |
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| JP特开2002-271442A 2002.09.20 |
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