CN102035794A - Method and system for transmitting and receiving synchronizing sequence of multimedia broadcast multicast service - Google Patents
Method and system for transmitting and receiving synchronizing sequence of multimedia broadcast multicast service Download PDFInfo
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Abstract
The invention discloses a method and a system for transmitting and receiving a synchronizing sequence of a multimedia broadcast multicast service (MBMS). The method for transmitting the synchronizing sequence comprises the following steps that: an upper network element indicates starting synchronizing sequence time stamp information of the MBMS transmitted by a lower network element; and the upper network element marks a first synchronizing sequence time stamp of the service according to the starting synchronizing sequence time stamp information. Through the technical scheme, the lower network element can accurately acquire the starting time and interval of the synchronizing sequences in one group of network elements synchronously transmitted by the MBMS, so that the situation that correct receiving and packet loss detection cannot be performed in a period of time at the beginning of the service to cause faulty transmission of service data is avoided.
Description
Technical field
The present invention relates to wireless communication technology field, more specifically, relate to a kind of synchronizing sequence method of sending and receiving and system of multimedia broadcast-multicast service.
Background technology
In order to effectively utilize mobile network resource, 3GPP (3
RdGeneration Partnership Project, third generation partner program) multimedia broadcast-multicast service (Multimedia BroadcastMulticast Service has been proposed, be called for short MBMS), this business is a kind of from the technology of a data source to a plurality of targets transmission data, has improved the utilance of Internet resources (especially air interface resource).The MBMS of 3GPP definition not only can realize the classes of messages multicast and the broadcasting of plain text low rate, but also can realize the broadcasting and the multicast of high-speed multimedia business, multiple rich video, audio frequency and multimedia service are provided, and the trend that this has complied with following mobile data development undoubtedly is 3G (3
RdGeneration, 3G (Third Generation) Moblie technology) development provides better professional prospect.
In 3GPP, the MBMS business can adopt the multicast mode to send, different according to concrete transmission and receive mode, the multicast mode is divided into MBSFN (Multicast/Broadcast over SingleFrequency Network again, single frequency network multicast broadcast) mode and soft merging (Soft Combining) mode, wherein:
In the MBSFN send mode, the base station network element adopts identical modulating-coding form in a plurality of sub-districts, adopts identical physical resource to send identical MBMS service signal, and these a plurality of sub-districts have constituted a MBSFN zone.The feature of MBMS send mode comprises: 1) at the identical MBSFN signal of MBSFN zone inter-sync transmission; 2) support user terminal to merge the MBSFN signal that receives from a plurality of sub-districts, improve the gain of received signal.The MBSFN sending mode is applied to LTE (LongTerm Evolution in the prior art, Long Term Evolution) (the Universal MobileTelecommunications System of the MBMS in the system, universal mobile telecommunications system), the MBMS of special-purpose carrier frequency sends in the UMTS system.
Soft merging transmission and MBSFN mode are similar, and in the UMTS system, the base station network element sends identical business tine in a plurality of sub-districts, and the MBMS service signal that user terminal receives simultaneously from a plurality of sub-districts carries out soft merging reception, improves receiving gain.Different with the MBSFN mode is that different spreading code and cell scrambling are adopted in described a plurality of sub-districts when sending the MBMS business.
In existing MBMS technology, adopt following channel architecture:
In the LTE system, a MBMS business is mapped to a MTCH (Multicast TrafficChannel, multicast service channel).Many the MTCH channel can be mapped on a MCH (Multicast Channel, the Multicast Channel) transmission channel by time-multiplexed mode; In the LTE of reality networking, several MBSFN business are arranged on the MBSFN zone, the data channel MTCH of a plurality of MBSFN business in identical MBSFN zone and the MCCH of this MBSFN business (MulticastControl Channel, multicast service channel) can be multiplexed into a MCH.
In the UMTS system, belong to identical MBSFN zone or MBSFN cluster (bunch) or the MTCH of one group of MBMS business of MSMS group can be mapped to same transmission channel.In the special carrier frequency technology of UMTS, adopt on all four cell scrambling because constitute a plurality of sub-districts of MBSFN transmission, the physical channel that therefore carries MCCH also adopts the MBSFN mode to send.
In the existing LTE technology, multiplexingly can adopt the resource of the following dynamic shared channel of mode in a plurality of MBMS business of same transmission channel, this mode is called dynamic multiplexing (DynamicMultiplexing).
In LTE MBMS, define the notion of dispatching cycle, or be called MSAP (MBSFNsubframe allocation pattern, MBSFN sub-frame allocation pattern) length.On time domain, be defined as a time period length dispatching cycle, for example 320 or 640ms, in this time period, a transmission channel takies and distributes some MBSFN subframes (subframe) resource.
As shown in Figure 1, in a dispatching cycle, the data of a MBMS logic channel take the resource of the transmission channel of its mapping continuously, promptly take the MBSFN sub-frame resources of MCH channel continuously, and whole transmission of business datum that needs to send in this dispatching cycle up to this business finishes.The data of different business can send in same MBSFN subframe, data from different logic channels are serially connected in transmission among the same MAC PDU (Media Access Control Protocol Data Unit, medium access control layer protocol data cell) by the MAC layer.
Concrete, the corresponding TTI (TransmissionTime Interval, Transmission Time Interval) of the MBSFN wireless sub-frame of a LTE definition can send one or more transmission data blocks in a TTI, the corresponding MAC PDU of each transmission data block.In a MAC PDU, can comprise a plurality of MAC SDU (Service Data Unit, service data unit), the different MAC SDU among the same MAC PDU are used to carry the data of different MBMS logic channels.
The a plurality of multiplexing sending orders of MBMS logic channel in a dispatching cycle can be given user's receiving terminal by MCCH channel or other signaling.Wherein, above-mentioned MBMS logic channel comprises MTCH, MCCH or MSCH (Multicast Scheduling Channel, multicast scheduling channel) etc.
For realizing that the MBMS business realizes synchronous transmission in the minizone of a plurality of network element entities (base station network element), prior art discloses a kind of synchronous protocol and has handled (SYNC) mode, and this method comprises upper strata network element and lower network element, as shown in Figure 2.This SYNC agreement comprises following processing:
Step S101, the upper strata network element sends the MBMS business data packet to each lower network element, this business data packet has been carried business datum, and carry timestamp information, sequence of data packet information, accumulative total business datum length information etc., the upper strata network element is to the identical timestamp information of one or more continuous business data packet signs, these marks the packet of identical time stamp form data bursts (data burst) or be called synchronizing sequence (Synchronization Sequence).The timestamp difference of adjacent two synchronizing sequences is a synchronizing sequence length.
The upper strata network element is the interval with synchronizing sequence length, and the business datum that needs send is periodically constructed synchronizing sequence, the mark timestamp, and send to lower network element.Described is the interval with synchronizing sequence length, and the interval of timestamps that is meant adjacent two synchronizing sequences is a synchronizing sequence length.
Concrete, according to specific implementation, the upper strata network element can need the rise time of time that reaches the upper strata network element of the business datum that sends or business data packet or according to the upper strata network element business datum be carried out the laggard row labels of traffic shaping.To reach the time mark timestamp according to business datum is example, the assumes synchronization sequence is spaced apart L, then the time interval be Ti to the business data packet that reaches the upper strata network element between the Ti+L, form the business data packet of a synchronizing sequence, Ti and Ti+L carry out the time point of described processing for the upper strata network element.
Referring to Fig. 3, above-mentioned accumulative total business data packet length information is meant in the synchronizing sequence, or from certain starting point, arrives the business datum cumulative length of described business data packet all business data packet before.Fig. 3 shows a synchronizing sequence of being made up of 3 data bags.
In conjunction with Fig. 4, last at each synchronizing sequence, the upper strata network element also sends a kind of SYNC control frame, and this control frame has carried the total number of business data packet, the business datum total length information of its corresponding synchronizing sequence.
Concrete in existing synchronous protocol (SYNC), adopt the frame structure bearer service data of Class1 and 2, the frame structure of employing type 0 carries described SYNC control frame.
Described synchronizing sequence comprises above-mentioned synchronizing sequence Frame (bag) and synchronous protocol (SYNC) control frame.
The upper strata network element is when mark synchronizing sequence timestamp, need to consider transmission delay, processing time-delay and synchronizing sequence length and other the time-delay of business data packet from the upper strata network element to lower network element, in the time of could guaranteeing that lower network element receives synchronizing sequence like this, there is adequate time to handle, and to the suitable radio interface scheduling cycle, sends according to the time map of timestamp indication.
For example, above-mentioned various time-delay total amounts are D, and the upper strata network element need be considered the influence of time-delay D when sending synchronizing sequence T, and the D time quantum sends synchronizing sequence T at least in advance.Just T-D constantly or before send synchronizing sequence T.
The relation of the timestamp between one group of continuous synchronizing sequence has been shown among Fig. 4, and the transmission of described SYNC control frame.
Step S102, lower network element receives above-mentioned synchronizing sequence, and by detecting the sequence number of business data packet, detect the total length that whether has the business data packet that losing of business data packet lost.
The sequence number of the packet of the synchronizing sequence that lower network element receives by detection, can detect and whether have losing of business data packet, for example to have received the sequence number of the business data packet of synchronizing sequence X be N-1 to lower network element, N, N+3, N+4... then lower network element can detect packet N+1, and N+2 loses.Lower network element is the poor of the packet of N and the N+3 cumulative data length of carrying by detecting sequence number further, can know the business datum N+1 that is lost, the business datum length of N+2 and.
Lower network element can also be obtained the total number of packet and the business datum total length of its corresponding synchronizing sequence by reading above-mentioned SYNC control frame.This control frame also is the mark that a synchronizing sequence finishes.
Step S103, each lower network element begins to send business data packet successively at wave point in the dispatching cycle of its timestamp correspondence to the entrained business datum of the business data packet in the same synchronizing sequence.
The upper strata network element should have the identical reference time with lower network element.Described timestamp information is that the upper strata network element is understood consistent temporal information with lower network element.
Be mapped to the some business data packet of business (from one or more synchronizing sequences) in the dispatching cycle, carrying out wireless link protocol layer (Radio Link Control, be called for short RLC) when handling, carry out RLC segmentation and serial connection processing, to obtain maximum wireless interface resource service efficiency.
Each lower network element is independently finished the radio link control layer of MBMS business data packet is handled, and comprises and distributes RLC sequence number, RLC burst and serial connection (segmentation andconcatenation).Being assigned as from 0 to maximum of RLC sequence number recycles.Under normal circumstances, each lower network element is safeguarded current RLC PDU sequence number, and carry out identical processing according to the packet that receives, and Initial R LC sequence number can by configuration keep between a plurality of lower network element synchronously, like this, each lower network element can keep the unanimity of RLC serial number assignment in the deal with data process.
When packet loss occurring, lower network element is by detecting the length of data package that described cumulative data packet length can obtain losing.In this case, lower network element can be constructed a virtual data pack when carrying out the rlc layer protocol processes, and its length is the length of data package of losing.This virtual data pack is the same with other packet that correctly receives carries out the RLC serial connection, burst is handled.When real wave point sends, the TTI that includes these virtual data bag data will not send, but mourn in silence (mute).This processing mode is called mute and handles.Handle by mute, can avoid the data of virtual data bag and the inconsistent interference that causes of business datum that other network element correctly receives.And, because the length of this virtual data bag is consistent with the length of data package of losing, the size in the space that it occupies in RLC PDU is consistent with the space size that real packet occupies, and the starting position of packet in RLC PDU that correctly receives after this packet of losing is consistent with the network element that packet loss do not occur like this.Just, kept the network element of packet loss and do not had packet loss network element uniformity of treatment by such processing.
Consider that there is the possibility of restarting in lower network element, after restarting, lose for the RLC sequence number of this MBMS service maintenance before it, this moment, it can't determine that the next one is received the MBMS business data packet carries out RLC sequence number after RLC burst serial connection is handled, to keep and adjacent network element sub-district is carried out RLC serial connection burst to this business data packet and handled the sequence number of back distribution and be consistent.In order to address this problem, in the prior art, the method that has adopted the RLC sequence number to reset, concrete, beginning a dispatching cycle, the RLC sequence number is since 0 distribution, and the lower network element of restarting like this can keep the synchronous of RLC sequence number with other network element again since a dispatching cycle.
According to the length of synchronizing sequence and dispatching cycle length relation, its mapping relations can comprise following several:
1. many synchronizing sequences are mapped to a dispatching cycle, and this moment, dispatching cycle, length was the integral multiple of synchronizing sequence length.
2. a synchronizing sequence is mapped to a plurality of dispatching cycles, and this moment, the length of synchronizing sequence was the integral multiple of dispatching cycle.
By above-mentioned method, a plurality of lower network element receive duplicate business data packet, and according to the content of SYNC agreement, can carry out the synchronous service data processing, thereby keep synchronous transmission business datum.
In more than describing, upper strata network element and lower network element can be the compound modes of following network element, but are not limited to following combination:
1, in the networking of the MBMS of UMTS system service synchronization, the upper strata network element is a core network element, and lower network element is RNC (Radio Network Controller, a radio network controller).
2, in the networking of the MBMS of LTE system service synchronization, the upper strata network element is BMSC (BroadcastMulticast Service Center, BroadCast MultiCast Service center), and lower network element is eNB (E-UTRANNodeB).
Fig. 2 example the building-block of logic of described upper strata network element-lower network element.Wherein there are logic interfacing or physical interface between lower network element.
In the service deployment of reality, a business can need to send in certain time period without any data, and this time is called this professional free time.If the time period content of a synchronizing sequence length does not have data to need to send, then this synchronizing sequence length is called the idle synchronizing sequence of this business.In the prior art, adopt the idle synchronizing sequence of following technology for detection:
The upper strata network element sends the SYNC control frame at described idle synchronizing sequence, and its timestamp is the timestamp of this synchronizing sequence, and to indicate the packet number of this synchronizing sequence be 0, and cumulative data bag total length is 0.Lower network element receives this control frame, can know that the synchronizing sequence of described timestamp correspondence needs to send without any data.
Because synchronizing sequence is periodic, thus do not having in the time period of data, every one synchronizing cycle length, the upper strata network element will send above-mentioned control frame.
And lower network element can be according to synchronizing sequence length, and just the interval of timestamps of adjacent synchronizing sequence carries out described idle-detection.Concrete, according to the difference of implementation, lower network element can detect in the different moment.For example, in lower network element according to the timestamp of synchronizing sequence radio interface scheduling cycle of being mapped to of this synchronizing sequence as can be known, when lower network element was adjudicated this radio interface scheduling whether data are existed packet loss in the cycle, lower network element detected total data frame and the control frame that whether receives described synchronizing sequence.
Because synchronizing sequence is to send so that fixing interval (synchronizing sequence length) is periodic, so lower network element can be known the timestamp information of each synchronizing sequence, for example, lower network element is when receiving synchronizing sequence Tj (being that timestamp is the synchronizing sequence of Tj), the timestamp of just knowing follow-up synchronizing sequence is followed successively by Tj+L, Tj+2L.。。Therefore also can predict the radio interface scheduling cycle that each synchronizing sequence is mapped to.
The benefit that this idle-detection is brought is: lower network element can know that a synchronizing sequence is because need to send without any data, still all loses because of all packets to have caused it not receive any packet.If because idle cause do not have a business data packet, then lower network element can safety transmission and other professional data of this service integration, if any packet that does not receive a synchronizing sequence that has caused because lost packet, then lower network element can not send with other business datums of this service integration or in the dynamic multiplexing scheduling, lower network element can not send according to professional sending order, the data of the business of other that sends after this business.
As shown in Figure 4, timestamp is in the synchronizing sequence length of T2 and T3, needs to send without any data, has only the control frame of SYNC.
But there are the following problems for above-mentioned method:
In the prior art, lower network element can't be known the time started of business datum, thereby might correctly receive and packet loss, idle-detection.For example, the timestamp of supposing first synchronizing sequence of certain business is T1, if and because from the upper strata network element to the data-bag lost lower network element, the timestamp of first synchronizing sequence that lower network element receives is T2, and then lower network element can not judge that whether having synchronizing sequence before T2 needs to send.In this case, if lower network element is handled according to the situation that does not have packet loss, then from T1 constantly, the data-signal that this lower network element sends at wave point will be inconsistent with other network element, cause the interference of minizone;
Same, in the prior art, lower network element can not be known the concluding time of business datum accurately.Like this, if business datum finishes, and lower network element is also receiving and packet loss, idle-detection, with the judgement that leads to errors, thinks that business data packet all loses, thus to other business of this service integration processing of mourning in silence.
Therefore, because lower network element can't be known the initial synchronizing sequence (being first synchronizing sequence) of a business and finish the timestamp information of synchronizing sequence (being last synchronizing sequence), thereby might correctly receive and packet loss detection, and then will cause the interference of minizone, or cause unnecessary mourning in silence to handle the business that normally receives.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of synchronizing sequence method of sending and receiving and system of multimedia broadcast-multicast service, makes lower network element can know timestamp information initial or the end synchronizing sequence.
In order to address the above problem, the invention provides a kind of synchronizing sequence sending method of multimedia broadcast-multicast service, comprising:
The initial synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent;
Described upper wire unit is according to first synchronizing sequence timestamp of the described business of described initial synchronizing sequence timestamp information mark.
Further, described upper strata network element is indicated the described initial synchronizing sequence timestamp information of described lower network element by chain of command message.
The present invention also provides a kind of synchronizing sequence sending method of multimedia broadcast-multicast service, comprising:
The end synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described upper strata network element stops to send the synchronizing sequence of described business at the synchronizing sequence that sends described end synchronizing sequence timestamp correspondence or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp correspondence.
Further, described upper strata network element is indicated the described end synchronizing sequence of described lower network element timestamp information by chain of command message.
The present invention also provides a kind of synchronizing sequence sending and receiving methods of multimedia broadcast-multicast service, comprising:
The initial synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent; And according to first synchronizing sequence of the described business of described initial synchronizing sequence timestamp information mark;
Described lower network element from the synchronizing sequence of described initial synchronizing sequence timestamp sign, is carried out the reception and/or the packet loss detection of synchronizing sequence according to the described initial synchronizing sequence timestamp information that receives to described business.
Further, if described lower network element does not receive the synchronizing sequence of described initial synchronizing sequence timestamp sign, judge that then described initial synchronizing sequence all loses.
Further, described upper strata network element is indicated the described initial synchronizing sequence timestamp information of described lower network element by chain of command message.
The present invention also provides a kind of synchronizing sequence sending and receiving methods of multimedia broadcast-multicast service, comprising:
The end synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent, described end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described upper strata network element stops to send the synchronizing sequence of described business at the synchronizing sequence that sends described end synchronizing sequence timestamp sign or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp sign;
Described lower network element is according to the described end synchronizing sequence timestamp information that receives, at the synchronizing sequence of receiving described end synchronizing sequence timestamp sign or after described end synchronizing sequence timestamp time corresponding, stop described business is carried out the reception and/or the packet loss detection of synchronizing sequence.
Further, described upper strata network element is indicated the described end synchronizing sequence of described lower network element timestamp information by chain of command message.
The present invention also provides a kind of synchronizing sequence method of reseptance of multimedia broadcast-multicast service, comprising:
Described lower network element from the synchronizing sequence of described initial synchronizing sequence timestamp sign, is carried out the reception and/or the packet loss detection of synchronizing sequence according to the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that receives to described business.
The present invention also provides a kind of synchronizing sequence method of reseptance of multimedia broadcast-multicast service, comprising:
Described lower network element is according to the described end synchronizing sequence timestamp information that receives, at the synchronizing sequence of receiving described end synchronizing sequence timestamp sign or after described end synchronizing sequence timestamp time corresponding, stop described business is carried out the reception and/or the packet loss detection of synchronizing sequence;
Wherein, described end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence.
The present invention also provides a kind of synchronizing sequence transmitting system of multimedia broadcast-multicast service, is applied to the upper strata network element, comprises timestamp indicating member and transmitting element, wherein:
Described timestamp indicating member is used for, the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent;
Described transmitting element is used for, according to first synchronizing sequence timestamp of the described business of described initial synchronizing sequence timestamp information mark.
Further, described timestamp indicating member also is used for, the end synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent, wherein, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described transmitting element also is used for, at the synchronizing sequence that sends described end synchronizing sequence timestamp correspondence or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp correspondence, stop to send the synchronizing sequence of described business.
The present invention also provides a kind of synchronizing sequence sending/receiving system of multimedia broadcast-multicast service, comprise upper strata network element and lower network element, described upper strata network element further comprises timestamp indicating member and transmitting element, and described lower network element comprises the reception detecting unit, wherein:
Described timestamp indicating member is used for, the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent;
Described transmitting element is used for, according to first synchronizing sequence timestamp of the described business of described initial synchronizing sequence timestamp information mark;
Described receiving element is used for, and according to the described initial synchronizing sequence timestamp information that receives, from the synchronizing sequence of described initial synchronizing sequence timestamp sign, described business is carried out the reception and/or the packet loss detection of synchronizing sequence.
Further, described timestamp indicating member also is used for, the end synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent, wherein, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described transmitting element also is used for, at the synchronizing sequence that sends described end synchronizing sequence timestamp correspondence or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp correspondence, stop to send the synchronizing sequence of described business;
Described receiving element is used for, according to the described end synchronizing sequence timestamp information that receives, at the synchronizing sequence of receiving described end synchronizing sequence timestamp sign or after described end synchronizing sequence timestamp time corresponding, stop described business is carried out the reception and/or the packet loss detection of synchronizing sequence.
The present invention has following beneficial effect at least: in a group NEs of realizing the MBMS synchronized transmission, make lower network element can know the zero-time and the interval of synchronizing sequence accurately, thereby avoided reception that can not be correct in a period of time that business begins and carried out packet loss detection, the situation of the transmission business datum that leads to errors.
Description of drawings
Fig. 1 is the multiplexing schematic diagram of MBMS service dynamic;
Fig. 2 is a networking schematic diagram synchronous between the MBMS business network element;
Fig. 3 is the schematic diagram of synchronizing sequence and synchronous control frame in the synchronous protocol;
Fig. 4 is the transmission schematic diagram of idle synchronizing sequence and synchronous control frame;
Fig. 5 is synchronizing sequence and the mapping relations figure of dispatching cycle in one of embodiment of the invention;
Fig. 6 is the schematic block diagram of the synchronizing sequence sending/receiving system of MBMS business in one of embodiment of the invention.
Embodiment
Below in conjunction with drawings and the specific embodiments the present invention is described in further detail.
In the preferred embodiment of the present invention, adopt following technical scheme:
A) the upper strata network element is by chain of command message indication lower network element, the initial synchronizing sequence timestamp information of a business;
This timestamp information comprises the temporal information that relative time or absolute time form are represented.
Optionally, also by chain of command message indication lower network element synchronizing sequence length information, described synchronizing sequence length information is the time span of absolute time value representation to the upper strata network element.
B) the upper strata network element is the time interval from described initial synchronizing sequence timestamp with described synchronizing sequence length, the timestamp of structure and mark synchronizing sequence Frame and/or SYNC control frame.
If send without any packets need in the described synchronizing sequence, then the upper strata network element sends the SYNC control frame of corresponding synchronizing sequence.
C) lower network element is according to the initial synchronizing sequence timestamp information of described business, or together with described synchronizing sequence length information the synchronizing sequence of described business received processing.。
Concrete, lower network element is to from described initial synchronizing sequence, and the synchronizing sequence that is the interval with described synchronizing sequence length receives processing.
In the present embodiment, lower network element is handled the reception of described synchronizing sequence and is included but not limited to: from the synchronizing sequence of described initial synchronizing sequence timestamp sign, be the interval with described synchronizing sequence length, periodically detect.Described detection is meant:
If lower network element receives the synchronizing sequence Frame or the SYNC control frame of described synchronizing sequence, then handle according to the synchronous protocol of prior art.
If lower network element does not receive described synchronizing sequence (comprising synchronizing sequence Frame or SYNC control frame), then losing of whole synchronizing sequence should appear in the lower network element judgement.
In other embodiment of the present invention, lower network element also can receive processing to synchronizing sequence in advance according to the initial synchronizing sequence timestamp information of knowing.
In another embodiment of the present invention, adopt following technical scheme:
The upper strata network element is by the end synchronizing sequence timestamp information of chain of command message indication lower network element business;
Lower network element stops to carry out the reception processing of this business according to described end synchronizing sequence timestamp.
Concrete, lower network element stops the reception of this business datum is handled at the synchronizing sequence that receives described end synchronizing sequence timestamp sign or after described end synchronizing sequence timestamp time corresponding.
Wherein, mode and the foregoing description of upper strata network element indication end synchronizing sequence timestamp information are similar, do not repeat them here.
Be further elaborated below in conjunction with the enforcement of application example of the present invention technique scheme.
Application example one
In this example, the upper strata network element is BMSC, and lower network element is eNB; Chain of command message is that session begins message (MBMS Session Start).
Described synchronizing sequence Frame is the type1 of SYNC agreement, type2 frame format, the type0 frame format that described SYNC control frame is the SYNC agreement.
BMSC sends to the initial synchronizing sequence time stamp T 1 of carrying professional S in the MBMS Session Start message of eNB, optionally, also carries the synchronizing sequence length L.
BMSC begins to send synchronizing sequence Frame or the SYNC control frame that carries initial time stamp T1 according to the Timing Advance D (for example transmission delay and processing time-delay etc.) of configuration from time T 1-D.
In the eNB side, be P the dispatching cycle of the transmission channel of this business mapping, and in this embodiment, be two double-lengths of synchronizing sequence length L dispatching cycle.At this moment, will shine upon two synchronizing sequences a dispatching cycle.
Concrete, synchronizing sequence to the mapping mode of dispatching cycle is: synchronizing sequence be mapped in after its timestamp or over against dispatching cycle.In this is, the situation of initial synchronizing sequence timestamp mapping as shown in Figure 5, just dispatching cycle P1.
The timestamp of first synchronizing sequence that the eNB expectation receives is T1.Then eNB begins to receive and detect this business datum from this synchronizing sequence.
When eNB arrived in time stamp T 1 time corresponding, T1 detected to synchronizing sequence, was this professional synchronizing sequence Frame or the SYNC control frame of T1 if received timestamp, then handled according to existing synchronous protocol.
If eNB receives only the SYNC control frame that timestamp is T1, and the packet number in this SYNC frame is 0, then judges in this synchronizing sequence length, and this business does not have data to need to send.
If eNB does not receive this professional synchronizing sequence or SYNC control frame that timestamp is T1, then eNB thinks that synchronizing sequence T1 all loses.
ENB is from T1, and the synchronizing sequence to every a series of timestamp correspondences in the L time interval detects successively.In this embodiment, the timestamp of these synchronizing sequences is T1+L, T1+2L, T1+3L ... ..
In above-mentioned synchronizing sequence, if there is not business datum to need to send, then BMSC constructs the SYNC control frame of this synchronizing sequence, and just type 0 frame of SYNC agreement sends to lower network element.
In this embodiment, be P1 the dispatching cycle of synchronizing sequence T1 correspondence, synchronizing sequence T1+L, and be P2 the dispatching cycle of T1+2L correspondence.
In this embodiment, when described timestamp time corresponding reaches, can be and be not limited to one of following situation: when the dispatching cycle of described timestamp correspondence, the time reached, when lower network element was constructed the dispatching cycle of described timestamp correspondence or judgement whether can send the time.
Application example two
In this example, the upper strata network element is BMSC, and lower network element is eNB.
Described chain of command message is that session begins message (MBMS Session Stop) (for example can predict under the situation of concluding time at BMSC) or session stops message (MBMS Session Stop).
Described synchronizing sequence Frame is the type1 of SYNC agreement, type2 frame format, the type0 frame format that described SYNC control frame is the SYNC agreement.
BMSC sends to the end synchronizing sequence time stamp T 0 of carrying professional S in the MBMS Session Start of eNB or the MBMS Session Stop message.
ENB receives processing till last synchronizing sequence of described end synchronizing sequence time stamp T 0 indication to synchronizing sequence.
Wherein, about finishing the definition of synchronizing sequence timestamp, concrete processing can be:
1. define the time stamp T 0 of described end synchronizing sequence timestamp for this last synchronizing sequence of business, then eNB is after the synchronizing sequence T0 that to timestamp is T0 receives processing, with no longer receive this professional synchronizing sequence and/or or detect this professional synchronizing sequence reception condition, but think that the synchronizing sequence that will no longer include any this service conversation after this reaches eNB.
In the case, BMSC sends this professional synchronizing sequence Frame or SYNC control frame, till distributing the synchronizing sequence Frame or SYNC control frame that timestamp is T0.
2. define the synchronizing sequence timestamp that described end synchronizing sequence timestamp stops to send for this business, i.e. the next synchronizing sequence timestamp of last synchronizing sequence of this business of Fa Songing.In the case, BMSC sends this professional synchronizing sequence Frame or SYNC control frame, till distributing the previous synchronizing sequence Frame or SYNC control frame that timestamp is T0.And eNB stops to receive this professional synchronizing sequence and/or detects this professional synchronizing sequence reception condition from this timestamp time corresponding, and thinks that this business does not have timestamp and arrives eNB more than or equal to the T0 synchronizing sequence.
In above-mentioned synchronizing sequence, if there is not business datum to need to send, then BMSC constructs the SYNC control frame of this synchronizing sequence, and just type 0 frame of SYNC agreement sends to eNB.
In addition, as shown in Figure 6, a kind of synchronizing sequence transmitting system of multimedia broadcast-multicast service also is provided in the embodiment of the invention, be applied to the upper strata network element, comprise timestamp indicating member and transmitting element, wherein: the timestamp indicating member is used for, the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent;
Transmitting element is used for, according to first synchronizing sequence timestamp of initial synchronizing sequence timestamp information tagged traffic.
Further, the timestamp indicating member also is used for, the end synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent, wherein, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of business or the next timestamp information of last synchronizing sequence;
Transmitting element also is used for, and after sending the synchronizing sequence that finishes synchronizing sequence timestamp correspondence or sending the previous synchronizing sequence of the synchronizing sequence that finishes synchronizing sequence timestamp correspondence, stops to send professional synchronizing sequence.
Referring to Fig. 6, the present invention also provides a kind of synchronizing sequence sending/receiving system of multimedia broadcast-multicast service, comprises upper strata network element and lower network element, and the upper strata network element further comprises timestamp indicating member and transmitting element, lower network element comprises the reception detecting unit, wherein:
The timestamp indicating member is used for, the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent;
Transmitting element is used for, according to first synchronizing sequence timestamp of initial synchronizing sequence timestamp information tagged traffic;
Receiving element is used for, and according to the initial synchronizing sequence timestamp information that receives, from the synchronizing sequence of initial synchronizing sequence timestamp sign, business is carried out the reception and/or the packet loss detection of synchronizing sequence.
Further, the timestamp indicating member also is used for, the end synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent, wherein, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of business or the next timestamp information of last synchronizing sequence;
Transmitting element also is used for, and after sending the synchronizing sequence that finishes synchronizing sequence timestamp correspondence or sending the previous synchronizing sequence of the synchronizing sequence that finishes synchronizing sequence timestamp correspondence, stops to send professional synchronizing sequence;
Receiving element is used for, according to the end synchronizing sequence timestamp information that receives, after receiving the synchronizing sequence that finishes synchronizing sequence timestamp sign or finishing synchronizing sequence timestamp time corresponding, stop business being carried out the reception and/or the packet loss detection of synchronizing sequence.
Should be appreciated that above-mentioned embodiment only is for the convenient preferred embodiment that provides of the present invention being provided, can not being interpreted as qualification the present invention, therefore by all technical schemes that claim of the present invention covered all at the row of prescription of the present invention.
Claims (15)
1. the synchronizing sequence sending method of a multimedia broadcast-multicast service is characterized in that, comprising:
The initial synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent;
Described upper wire unit is according to first synchronizing sequence timestamp of the described business of described initial synchronizing sequence timestamp information mark.
2. the method for claim 1 is characterized in that,
Described upper strata network element is indicated the described initial synchronizing sequence timestamp information of described lower network element by chain of command message.
3. the synchronizing sequence sending method of a multimedia broadcast-multicast service is characterized in that, comprising:
The end synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described upper strata network element stops to send the synchronizing sequence of described business at the synchronizing sequence that sends described end synchronizing sequence timestamp correspondence or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp correspondence.
4. method as claimed in claim 3 is characterized in that,
Described upper strata network element is indicated the described end synchronizing sequence of described lower network element timestamp information by chain of command message.
5. the synchronizing sequence sending and receiving methods of a multimedia broadcast-multicast service is characterized in that, comprising:
The initial synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent; And according to first synchronizing sequence of the described business of described initial synchronizing sequence timestamp information mark;
Described lower network element from the synchronizing sequence of described initial synchronizing sequence timestamp sign, is carried out the reception and/or the packet loss detection of synchronizing sequence according to the described initial synchronizing sequence timestamp information that receives to described business.
6. method as claimed in claim 5 is characterized in that,
If described lower network element does not receive the synchronizing sequence of described initial synchronizing sequence timestamp sign, judge that then described initial synchronizing sequence all loses.
7. as claim 5 or 6 described methods, it is characterized in that,
Described upper strata network element is indicated the described initial synchronizing sequence timestamp information of described lower network element by chain of command message.
8. the synchronizing sequence sending and receiving methods of a multimedia broadcast-multicast service is characterized in that, comprising:
The end synchronizing sequence timestamp information of the upper strata network element indication multimedia broadcast-multicast service that lower network element sent, described end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described upper strata network element stops to send the synchronizing sequence of described business at the synchronizing sequence that sends described end synchronizing sequence timestamp sign or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp sign;
Described lower network element is according to the described end synchronizing sequence timestamp information that receives, at the synchronizing sequence of receiving described end synchronizing sequence timestamp sign or after described end synchronizing sequence timestamp time corresponding, stop described business is carried out the reception and/or the packet loss detection of synchronizing sequence.
9. method as claimed in claim 8 is characterized in that,
Described upper strata network element is indicated the described end synchronizing sequence of described lower network element timestamp information by chain of command message.
10. the synchronizing sequence method of reseptance of a multimedia broadcast-multicast service is characterized in that, comprising:
Described lower network element from the synchronizing sequence of described initial synchronizing sequence timestamp sign, is carried out the reception and/or the packet loss detection of synchronizing sequence according to the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that receives to described business.
11. the synchronizing sequence method of reseptance of a multimedia broadcast-multicast service is characterized in that, comprising:
Described lower network element is according to the described end synchronizing sequence timestamp information that receives, at the synchronizing sequence of receiving described end synchronizing sequence timestamp sign or after described end synchronizing sequence timestamp time corresponding, stop described business is carried out the reception and/or the packet loss detection of synchronizing sequence;
Wherein, described end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence.
12. the synchronizing sequence transmitting system of a multimedia broadcast-multicast service is applied to the upper strata network element, it is characterized in that, comprises timestamp indicating member and transmitting element, wherein:
Described timestamp indicating member is used for, the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent;
Described transmitting element is used for, according to first synchronizing sequence timestamp of the described business of described initial synchronizing sequence timestamp information mark.
13. system as claimed in claim 12 is characterized in that,
Described timestamp indicating member also is used for, the end synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent, wherein, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described transmitting element also is used for, at the synchronizing sequence that sends described end synchronizing sequence timestamp correspondence or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp correspondence, stop to send the synchronizing sequence of described business.
14. the synchronizing sequence sending/receiving system of a multimedia broadcast-multicast service, comprise upper strata network element and lower network element, it is characterized in that described upper strata network element further comprises timestamp indicating member and transmitting element, described lower network element comprises the reception detecting unit, wherein:
Described timestamp indicating member is used for, the initial synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent;
Described transmitting element is used for, according to first synchronizing sequence timestamp of the described business of described initial synchronizing sequence timestamp information mark;
Described receiving element is used for, and according to the described initial synchronizing sequence timestamp information that receives, from the synchronizing sequence of described initial synchronizing sequence timestamp sign, described business is carried out the reception and/or the packet loss detection of synchronizing sequence.
15. system as claimed in claim 14 is characterized in that,
Described timestamp indicating member also is used for, the end synchronizing sequence timestamp information of the multimedia broadcast-multicast service that indication is sent, wherein, this end synchronizing sequence timestamp information is last the synchronizing sequence timestamp information of described business or the next timestamp information of described last synchronizing sequence;
Described transmitting element also is used for, at the synchronizing sequence that sends described end synchronizing sequence timestamp correspondence or after sending the previous synchronizing sequence of synchronizing sequence of described end synchronizing sequence timestamp correspondence, stop to send the synchronizing sequence of described business;
Described receiving element is used for, according to the described end synchronizing sequence timestamp information that receives, at the synchronizing sequence of receiving described end synchronizing sequence timestamp sign or after described end synchronizing sequence timestamp time corresponding, stop described business is carried out the reception and/or the packet loss detection of synchronizing sequence.
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