CN104620525A - Method and arrangement for distributing information during broadcast delivery - Google Patents

Abstract

A BM-SC, and a method therein for transmitting data file by broadcast session to at least one UE, in a radio communication system; and a UE and a method therein for receiving a broadcast session of transmission of a data file from a BM-SC are provided. The method in the BM-SC comprises determining to transmit the data file to the at least one UE, and determining a FEC redundancy level to use for the transmission. The method also comprises transmitting, to the at least one UE, the data file using the determined FEC redundancy level and an indication of the determined FEC redundancy level.

Description

For the method and apparatus of point photos and sending messages during broadcast delivery

Technical field

The disclosure relates to broadcast message in a wireless communication system and can process BM-SC and UE of this broadcast message.

Background technology

Multicast broadcast multimedia service (MBMS) is the broadcast service provided via cellular network.Correspondingly, the MBMS (eMBMS) strengthened is used to name the MBMS in the grouping system of evolution, and the grouping system of described evolution comprises: for the universal terrestrial radio Access Network (E-UTRAN) of the evolution of Long Term Evolution (LTE) cellular network and the UTRAN for such as Universal Mobile Telecommunications System (UMTS) cellular network etc.Figure 1 illustrates a simplification example of the eMBMS solution framework based on LTE.

The framework 100 of Fig. 1 comprises at least one broadcast/multicast service center (BM-SC) 110, BM-SC 110 is the entities that can provide MBMS or eMBMS by distributing the content provided by one or more content and service provider 120, wherein, content and service provider 120 generally includes content library (not shown) and real-time encoder (not shown), can such as with satellite feed under the supervision of broadcast operation function 130, the form that real-time feeding and/or content delivery network (CDN) are fed to provides content feeds to BM-SC 110, this broadcast operation function 130 can be carried out with BM-SC 110 usually alternately.BM-SC 110 is connected to Access Network via multicast broadcast multimedia service gateway (MBMS-GW) 150, Access Network generally includes multiple access node, but for simplicity represented by single access node (base station 140) here, wherein, eNB 140 can via the unicast or multicast subscriber equipment (UE) provided content feeds being distributed to the scope being positioned at this Access Network.Herein, such UE is represented by single UE (UE 160).

Fail correctly to receive content feeds by least one UE to remedy; above-mentioned framework is also provided with such function usually, and it is configured such that BM-SC 110 can not receive the UE 160 retransmission part content feeds at least partially of content feeds to those reports.Such function is commonly called file reparation, or is more specifically called the reparation of HTTP clean culture file.For supporting document reparation, therefore BM-SC 110 is provided with at least one (but normally multiple) file repair server (not shown) usually, and described file repair server can provide the file fragment of loss in content feeds or damage to each request UE by the mode that retransmits the data previously sent.

As mentioned above, eMBMS is the broadcast service provided via the grouping system (comprising E-UTRAN LTE and UTRAN to access) of evolution.Two illustrations are described below and use example:

1. for sending such as sports tournament video content to the mobile phone of the high aggregation in stadium.EMBMS system can use MBMS download delivery method, such as User Datagram Protoco (UDP) UDP/ based on the file transfer (FLUTE) of one-way transmission, as the agreement of sending live TV content to terminal.HTTP real time flow medium (HLS) agreement according to apple or the media fragment according to DASH are downloaded by MBMS and are sent as file.

2. the distribution that upgrades of Android (Android).EMBMS system can use MBMS download delivery method (UDP/FLUTE) as the agreement of sending popular file, described popular file as: Android upgrade, YouTube video preprocessor loads or grave news event.

In the disclosure, term " terminal ", " MBMS receiver ", " MBMS client " and UE be used to indicate can reception as described herein via the device of the broadcasting transmitting of MBMS or eMBMS or equipment.

MBMS downloads the data file be supported in unidirectional MBMS carrying and sends, and improves the reliability of file reception by application FEC technology.But, although employ FEC, the reliability of can not ensure that data file sends 100%.

Therefore, define other two kinds of error recovery methods, and alternatively, these two kinds of error recovery methods use after can sending terminating MBMS.Utilize point-to-point (PTP) Ile repair method, unsatisfied UE can use HTTP to obtain the data of losing.Point-to-multipoint (PTM) Ile repair method allows BM-SC to send more MBMS data after the MBMS data transmission of reality.But this MBMS layer specification does not have any combination or the order of defined file restorative procedure.

MBMS downloads can be used to the data file of sending arbitrary number from single source to multiple UE.MBMS downloads and FLUTE [RFC3926] agreement can be used to carry out file delivery.FLUTE is designed to send, such as, for digital broadcasting based on the mass file of one way link.Because it is infeasible that HTTP with TCP communicates for PTM, so use agreement newly developed.Describe below with reference to Fig. 2 and transmit according to the typical eMBMS FLUTE of prior art.

According to Fig. 2, it is that the signaling diagram downloaded via MBMS or eMBMS of the communication network (NW) 220 that can process MBMS or eMBMS between BM-SC 200 and the UE (herein being represented by UE 220a, 220b) supporting MBMS or eMBMS is shown in a simplified manner respectively.According to hereafter, will be interpreted as meaning MBMS or eMBMS to mentioning of MBMS, and UE can alternatively be called as MBMS or eMBMS client.In fig. 2, such network infrastructure is represented by the gateway (GW) 210 NW 220 being connected to BM-SC 200, thus be provided in the access between UE220a, 220b and BM-SC 200.

In first step 200, set up MBMS carrying, and MBMS session by BM-SC 200.The All Files that will be received by UE requires the list item in FLUTE file delivery table (FDT), and it uses FLUTE FDT example to provide.So subscriber equipment 220a, 220b can use the FDT example retrieved, the FLUTE Object group received subsequently to decode and recover corresponding file object.

Therefore, UE 220a, 220b can: receive the FDT example sent by BM-SC 200 in step 200, in step 220 subsequently, and then receive the one or more files together with forward error correction (FEC) data.Forward error correction FEC definition of the component such as FEC code (RFC3452) and Object Segmentation mechanism.Object Segmentation mechanism describes and object data is divided into UDP grouping payload.Each file will be encoded with a FEC coding ID, and generate source code symbol and repair symbol.The FEC applied is included in corresponding FDT example.

Described process is repeated (illustrating by step 230 and 240) usually herein, until MBMS session is sent out (stopping 250 indicating by MBMS session herein).After completing this transmission, UE 220a, 220b just can report reception result and ask the file reparation of the content to also not success reception in case of need.Such request is with step 260 illustrate, UE 220a demand file is repaired in step 260, and in subsequent step 270, initiate file repair procedures, thus allow any UE (being UE 220a) to have second time chance to receive the file content lost, to obtain the successful reception to asked file content herein.In case of need, also identical process can be performed for UE 220b.

Before BM-SC 200 starts to divide into groups to UE 220a, 220b transmission or broadcast FLUTE, BM-SC 200 needs to send the user's service describing comprising necessary information.During delivery session, BM-SC 200 also needs the FDT example sent for describing file delivery object, and this mentions above.

UE 220a, 220b can use FDT example information to know file size, FEC coding ID and FEC carve information.But because FLUTE is based on UDP, usual UE 220a, 220b cannot know which grouping is the last grouping of a data file object, unless met following condition:

1.UE receives A mark (conversation end mark) or B mark (object end mark), or

2. reach FDT example time expiration.

In most of the cases, broadcast session carrys out broadcast data file, to improve the possibility successfully recovered by with certain FEC expense or FEC redundancy rank.But FDT example does not describe the FEC expense of adding source file object to or FEC redundancy rank is how many.Two kinds of possible situations are described below.

Situation 1: when real-time streaming transport, one send or broadcast session do not have any association for file repair delivery process.As the result lacking FEC expense or FEC redundancy rank, even if packet loss rate has exceeded applied FEC expense or the FEC redundancy level percentage for a section, UE will keep receiving grouping.

Situation 2: when on-demand content is sent, the delivery process of association illustrates that (ADPD) program is enabled for a delivery session or broadcast session.In this case, UE identifies the source symbol lost, and performs following steps:

Check that the reparation of PTP file is defined for MBMS download session (therefore, parameter repaired by file is available);

Wait for, until file repair procedures can be activated, wherein, UE calculates (at random) Backoff time and (randomly) select File remediation server (BM-SC); And

Client sends file repair request to selected file repair server.

Start-up time of file repair procedures of downloading for MBMS is the time expiration of FDT example at the latest.Time expiration " is expired " by FDT example, and XML attribute provides.

The fall-back mode downloaded for MBMS provides about correctly receiving the information when can asking to repair session from the recipient (i.e. UE) of some data of MBMS transmit leg (that is, BM-SC) during broadcasting transmitting session.The pattern of time window length that random time section can should calculate the random time of initiating file repair procedures thereon to point to UE defines.

Operator cannot obtain may the best-guess repaired of trigger file for a download session or broadcast session how many users, until reached file to repair fall-back mode, that is, when the broadcast delivery for this data file completes and UE starts to send file repair request to one or more remediation server.In some extreme environments, the file repair request of magnanimity may be there is during window repaired by the file for same download session.Such request mighty torrent can consume a large amount of unicast bandwidth, and file repair server may emit very large overload risk.Prevent potential file repair mighty torrent for large files send (as Android upgrades) valuable especially, reason is that little repair rate still can introduce large reparation amount in a network.

Summary of the invention

The object of this document is: eliminate or alleviate at least some defect in above-mentioned defect.More specifically, provide and manage such FEC redundancy level method for distinguishing for what provide FEC redundancy level method for distinguishing and correspondence from BM-SC to UE everywhere at UE, and be suitable for BM-SC and UE performing this method.

According to first aspect, provide a kind of method performed in BM-SC, described method is used for sending data at least one UE in radio communications system in broadcast session.According to the method, first determine the data that will send at least one UE at BM-SC place.Then determine FEC redundancy rank, its instruction will be applied to the FEC amount of redundancy that described data send, and sends described data and the instruction to described FEC redundancy rank after this to described one or more UE.

The described instruction to described FEC redundancy rank can be inserted in the FDT example of renewal, and as FEC redundancy level attribute, the FDT example of described renewal is after this sent to described one or more UE.

Described method can also comprise step: receive the information from least one UE at least one UE described, and described information indicates corresponding UE cannot successfully to decode sent data according to applied FEC redundancy rank to BM-SC.

Except receive the information type of advising from corresponding UE except, described receiving step can comprise: also receive the instruction to packet loss rate.

In addition, according to the first embodiment, BM-SC can by following manner to from least one UE, the information received about sent data of cannot decoding responds: determine to increase the FEC redundancy rank sent for follow-up data; And, send the instruction to the FEC redundancy rank upgraded to described one or more UE.

According to the second embodiment, alternatively, described BM-SC can: determine to stop to send to the data of at least one UE described; And, send the information about described termination to each UE corresponding.In addition, the described BM-SC time point that can will be rescheduled to the transmission of stopped data after a while.

According to the 3rd embodiment, described BM-SC can: determine that window repaired by the file expanding application during described data send; And, the file of expansion is repaired window and be applied to follow-up data transmission.

According to the 4th embodiment, window repaired by the file that described BM-SC can cancel application during described data send.

According to the 5th embodiment, described BM-SC can: preserve about report fail decoded data UE number and be intended to the information of packet loss percentage of at least one UE received at least one UE described in the data that send; And, based on preserved information, retransmit the reparation symbol of particular percentile, or use another time slot data retransmission.

According to another aspect, provide a kind of method performed in UE, described method is for receiving from the data the broadcast session of BM-SC transmission, the FEC redundancy rank that wherein said UE is applying when receiving transmission from the data of BM-SC with in the described data of transmission, and described UE uses the FEC redundancy rank received to received decoding data.

FEC redundancy rank can be supplied to UE as the attribute provided for this purpose in FDT example.

The method advised also comprises step usually: determine whether sent data can be successfully decoded; And, under described decoding is considered to unsuccessful situation, send the information indicating sent data of cannot decoding to described BM-SC.

Described forwarding step can also comprise: the packet loss rate indicating described transmission to described BM-SC.

In addition, the method for advising also can comprise step: determine the ratio between the number of the grouping of the unsuccessful decoding in sent data and the number of successful grouping of decoding; Determine the relation between described FEC redundancy rank and determined ratio; And if described ratio is higher than described FEC redundancy rank, and if for sent data not enabled file reparation, then stop to sent data any other grouping reception.

In addition, described UE can also perform following process: indicate by demand file reparation after the termination of initiated broadcast session, to receive the data of unsuccessful decoding in asked file repair procedures to described BM-SC.

According to another aspect, provide a kind of BM-SC, it is for sending data via broadcast session at least one UE in radio communications system.Described BM-SC comprises processor and computer-readable memory, and described computer-readable memory can store instruction, and described instruction makes described processor when being performed by described processor: determine to send data at least one UE described; Determine the FEC redundancy rank that will be used for described transmission; And, send the application described data of determined FEC redundancy rank and the instruction to determined FEC redundancy rank at least one UE described.

Described processor is also suitable for by determined FEC redundancy rank, namely by utilizing the FDT example used, carrying out transaction file and sending table FDT example.

Described memory can be modified, make it possible to store instruction, described instruction makes described processor when being performed by described processor: receive information from least one UE at least one UE described, described information cannot successfully to be decoded described data file to described BM-SC instruction at least one UE described according to being applied to the FEC redundancy rank sending described data file, and described information also indicates packet loss rate.

Described BM-SC can receive the information of described data file of cannot successfully decoding to described BM-SC instruction at least one UE described from least one UE at least one UE described, wherein this information comprises: receive the reception report request indicating packet loss rate to described BM-SC.

According to the first embodiment, described memory can also store instruction, and described instruction makes described processor when being performed by described processor: determine to increase FEC redundancy rank; And, continue to described at least one UE send the described data file using the FEC redundancy rank increased follow-up grouping and to after this will the instruction of FEC redundancy rank of the described increase of application.

According to the second embodiment, described memory can also store instruction, and described instruction makes described processor when being performed by described processor: determine to stop the transmission to the data file of described at least one UE (1000); And, send suspended information to the transmission of described at least one UE (1000) about data.Described memory can also store instruction, and described instruction makes described processor when being performed by described processor: described data are sent the time point be rescheduled to after a while.

According to the 3rd embodiment, described memory can also store instruction, and described instruction makes described processor when being performed by described processor: determine to expand to follow sending the reparation of the file after stopping window to the data of at least one UE described; And the file of expansion reparation window is applied to the file reparation session of following after the transmission of described data file stops.

According to the 4th embodiment, described memory can also store instruction, and described instruction makes described processor when being performed by described processor: determine to cancel to follow sending the reparation of the file after stopping window to the data of at least one UE described.

According to the 5th embodiment, described memory can also store instruction, and described instruction makes described processing unit when being performed by described processing unit: preserve about report fail decode described data file UE number and be intended to receive the information of packet loss percentage of at least one UE at least one UE described in described data file; And, after sending termination to the data of at least one UE described, retransmit the reparation symbol of particular percentile based on preserved information, or use another time slot in described broadcast session to retransmit described file.

According on the other hand, provide a kind of UE, it is suitable for receiving the broadcast session from the transmission data file of BM-SC.Described UE comprises: processor and memory, described memory can store instruction, described instruction makes described processor (1050) when being performed by described processor (1050): receive from described BM-SC and send, described transmission comprises described data file and the instruction to the FEC redundancy rank for sending described data; And the FEC redundancy rank indicated by using is decoded to received transmission.

Described memory can also store instruction, described instruction makes described processor when being performed by described processor: decode to received grouping or data file according to received FEC redundancy rank, wherein, if unsuccessful to the decoding of received transmission, then described processor is also suitable for sending the described UE of instruction to described BM-SC and cannot successfully decodes the information of described data file.

Described UE can be configured to: the information of described data file of also cannot successfully decoding to the described UE of described BM-SC transmission instruction, it comprises the reception report request sending instruction packet loss rate to described BM-SC.

Described memory can also store instruction, and described instruction makes described processor when being performed by described processor: receive multiple grouping; Ratio between the number determining the grouping of unsuccessful decoding and the number of grouping received; Determine the relation between described FEC redundancy rank and determined ratio; And, if described ratio is higher than described FEC redundancy rank, and if for sent data file not enabled file reparation, then stop to the same data file in described broadcast session other grouping receptions.

In addition, described memory can also store instruction, described instruction makes described processor when being performed by described processor: indicate to described BM-SC, after described broadcast session stops, session is repaired in request and the file of BM-SC, to receive the re-transmission to those groupings being designated as unsuccessful decoding to BM-SC.

Here BM-SC, UE and correlation method wherein can have some advantages.An advantage is: FEC redundancy class information is delivered to UE, makes UE can determine from how many groupings in the data file of BM-SC be successfully received and have how many groupings not to be successfully received.Once packet loss has exceeded FEC redundancy rank and before FDT example expires, UE can trigger action early.A () is for demblee form (dash) flow transmission, if FEC redundancy class information is included, then UE can be made in the packet loss of fragment more than the quick decision losing this whole fragment when FEC redundancy rank.Make UE can take action early when this fragment cannot be recovered.Otherwise UE must wait and reach FDT example time expiration, just may take any action.B (), for on-demand content, when the packet loss rate of UE is more than FEC redundancy rank, means that UE needs execute file repair process or session.UE can repair at file the forward direction BM-SC that window starts and notify file reparation on the horizon.BM-SC can use this statistics to determine how (to repair the phase by file lengthen or to cancel file repair procedures or session) and prevent from repairing storm.This is very useful, and it especially contributes to operator or BM-SC prevents the potential network unicast storm sending (such as Android upgrades) for large files from transshipping.

Accompanying drawing explanation

By reference to the accompanying drawings embodiment will be described in further detail, in accompanying drawing now:

Fig. 1 is the system architecture of the network of support MBMS according to prior art.

Fig. 2 is the signaling schemes of the typical MBMS download session between BM-SC and two UE illustrated according to prior art.

Fig. 3 is the schematic diagram being sent out file delivery affected the packet loss rate being no more than applied FEC redundancy rank.

Fig. 4 is the schematic diagram being sent out file delivery affected the packet loss rate being exceeded applied FEC redundancy rank.

Fig. 5 be illustrate BM-SC perform for determining FEC redundancy rank and providing it to the flow chart of the method for UE.

Fig. 6 a-6e is the flow chart of the alternate ways of the process illustrated after BM-SC place has determined FEC redundancy rank.

Fig. 7 a and 7b illustrates how UE can receive and use the flow chart of the FEC redundancy class information received from BM-SC,

Fig. 8 is the structural representation of the BM-SC that can be operating as BM-SC or associate with BM-SC illustrated according to the first embodiment.

Fig. 9 is the structural representation of the BM-SC illustrated according to the second embodiment.

Figure 10 is the structural representation of the BM-SC that can be operating as UE or associate with UE illustrated according to the first embodiment.

Figure 11 is the structural representation of the UE illustrated according to the second embodiment.

Embodiment

In brief, providing BM-SC, the UE for sending one or more data file from BM-SC to UE and corresponding method, wherein, indicating the FEC redundancy rank for broadcasting described data file to recipient UE.

More specifically, object of the present disclosure is: a kind of method describing BM-SC He can perform wherein, it, for coming to send data file to UE by broadcast session in radio circuit, wherein determines the FEC redundancy rank of described transmission or session at the network side of radio circuit and is indicated to (one or more) UE.Another object is: a kind of method providing UE He can perform wherein, and it is for from network reception broadcast session as above, and the FEC redundancy rank that wherein can be applicable to described transmission or session is instructed to UE.By providing FEC redundancy class information to UE, the stage in early days that is provided with can be used for about how to operate to the session initiated the information made a policy by UE, thus provides the more effective utilization to Internet resources.

Once BM-SC has determined to send data file by broadcast, BM-SC has just determined the FEC redundancy rank that will be used for this transmission.FEC makes the recipient of data can correct any possible mistake in the data received.Generally speaking, when by aerial transmission data, the quality possibility difference of transmission channel is very large, and the channel quality of difference may cause losing some data blocks (multiple bit or symbol).By adopting FEC, add additional bit or symbol by transmit leg entity to the data that will send.The symbol added is selected as, the data bit making the recipient of data that the bit of this interpolation or symbol can be used to recover to lose in the transmission or data symbol.

FEC redundancy rank represents " intensity " of used FEC.If FEC redundancy rank is low, then recipient only may can recover a little bit or symbol.Therefore, low FEC redundancy rank uses usually in the following cases: the quality that transmission channel has had, and this means that the data being sent to recipient only have relatively few bit drop-out.Similarly, if redundancy rank is high, then recipient may can recover relatively many bits or symbol.Therefore, high FEC redundancy rank uses usually in the following cases: transmission channel has poor quality, and the data that this means to be sent to recipient are lost by relatively many bits or symbol may.

FEC redundancy rank is higher, and sending data needs more resources.Usually, FEC adds data or information to data to be sent.The data side of being received added is for recovering bit or the symbol of any loss.FEC redundancy rank is higher, and more data are added to data to be sent.Therefore, do not wish to use too high FEC redundancy rank, this is because the extra resource of cost is transmitted data to recipient by this.FEC redundancy rank is expressed with percentage usually, and such as 10%, 20% or 35%.This percentage represents to the addition of how many extraneous informations for data to be sent.If BM-SC scheduled delivery 1 megabytes of data, and use the FEC redundancy rank of 10%, then this means that BM-SC needs to send 1.1 Mbytes to end user.FEC redundancy rank can be counted as the largest percentage packet loss that BM-SC can process, and therefore, if find that at UE place the packet loss of data session is more than FEC redundancy rank, then in addition to fec, also need to take means to tackle this packet loss rank.

The method also comprises at least one UE transmission use data file of determined FEC redundancy rank and the instruction to determined FEC redundancy rank.BM-SC sends the instruction to determined FEC redundancy rank to UE.This means, recipient UE had both received the data file comprising FEC redundancy rank, received again the instruction to this FEC redundancy rank.This makes (one or more), and UE can determine grouping or symbol Loss Rate separately at the commitment of this broadcasting process.Then UE can to BM-SC notice about grouping or the present case of symbol Loss Rate, and this will hereafter describe in more detail.

Here is the FDT framework renewal in advised 3GPP TS 26.346, and wherein defined new attribute (referred to herein as FEC-OTI-redundancy rank), wherein OTI is the abbreviation of Object Transmission Information.The instruction of FEC redundancy rank or information can be included in FDT example rank or file attribute rank.If FEC coding is activated, then can comprise this attribute, wherein the value of this attribute is to represent that the percentage of the expense that FEC causes provides.FEC-OTI-redundancy rank can be alternatively called FEC redundancy rank or FEC expense.

If UE knows the FEC-OTI redundancy rank of the data file object of arrival (from here backward from the beginning, referred to as FEC redundancy rank), then when between the transmission period of data file, UE experienced by packet loss (and more specifically, having been found that percentage of packet loss has exceeded the time point of FEC redundancy rank) UE can take different and better action, or, in other words, contrary with keeping the situation receiving the irreclaimable grouping of UE, therefore UE can abandon the packet belonging to corresponding document object from this time point.By selecting not continue to receive grouping, UE can not continue process, and as a result, it will the stage stops process in early days, and this will save battery, and can obtain better user friendly.

Fig. 3 is illustrative file delivery, and it comprises the FEC redundancy rank more than 20%, and also, UE will process the packet loss rate being no more than 20%, but when packet loss rate is more than 20%, will initiate action, as one of action of advising above.

More specifically, if find that packet loss is more than FEC redundancy rank, then UE can abandon session, i.e. the broadcasting transmitting of data file; Or UE can report packet loss rate to BM-SC before this broadcasting transmitting conversation end.

From the angle of operator or BM-SC, if as above advise, requirement repaired by the UE file that interim report is potential in early days, then can take different actions at BM-SC place, prevent from being called as business mighty torrent before fall-back mode is opened or in other words with the situation that network over loading is expressed to repair at file.

If MBMS download session supports the file reparation for content delivery as required, then operator can by the function of following manner control BM-SC.From the angle of operator, BM-SC becomes and understood potential file repair request quantity before the file repair procedures of reality starts, and can take different actions after this at BM-SC place.A this action can be extend to repair window; Another action can be associating delivery process (ADP) by announcing another sky or upgrade schedule fragment to represent that pressures UE was cancelled ADPD process by BM-SC before the startup of file reparation window, cancels the reparation of P2P data file.If there is a lot of UE to recover data file object, then BM-SC can dispatch another broadcast service for this download session.This can utilize Fig. 4 to carry out illustrations.Because UE just knows FEC redundancy rank in the beginning received, and packet loss rate can be determined in statistical significance and itself and FEC redundancy rank are compared, so it can by notifying that to BM-SC (namely once the broadcast session termination of downloading for data file) UE will need file repair process after FDT example expires, and make a response to the packet loss rate more than FEC redundancy rank 20%.

All client-requested information can be collected, to check that how many users (i.e. the number of UE) need the file reparation for ongoing download session.Depend on and reaching the statistics before file reparation window, different actions can be taked at BM-SC place:

1) if the quantity of file repair request can not flood network, but find that predefined reparation window is too short, then ADPD xml can be updated and send in the mode of (clean culture or broadcast) in band or out of band, repairs window with extendfile.

2) if the quantity of file repair request may flood network and file repair server, then file repair procedures or session can be cancelled by sending user's service describing (USD) fragment after upgrading in band.If needed, another time slot can be dispatched with data retransmission file in identical broadcast session, or dispatch another broadcast session and carry out data retransmission file, instead of use file repair mechanism.

Above-described BC-SC and method wherein and above-described UE and method wherein can have some advantages.An advantage is: make it possible to send FEC redundancy class information to UE, thus make UE can determine from how many groupings in the data file of BM-SC be successfully received and have how many groupings not to be successfully received, and this result can be assessed to take suitable action.Thus, once find that packet loss has exceeded FEC redundancy rank and before FDT example expires, UE can trigger action early.

A () is for demblee form (dash) flow transmission, if FEC redundancy class information is included, then UE can be made in the packet loss of fragment more than the quick decision losing this whole fragment when FEC redundancy rank, thus makes UE can take action early when this fragment cannot be recovered.Otherwise UE must wait and reach FDT example time expiration, can take any action.

B (), for on-demand content, when the packet loss rate of UE is more than FEC redundancy rank, means that UE needs execute file repair process or session.Can repair at file the forward direction BM-SC that window starts and notify file reparation on the horizon.BM-SC can use this statistics to determine and how to prevent from repairing storm by any one in following manner: repair the phase by file lengthen, or by cancelling file repair procedures or session.This is very useful, and it especially prevents the potential network unicast storm overload for large files transmission (what such as upgrade due to Android sends).

Fig. 5 and Fig. 6 a-6d is the flow chart being carried out the example sending the method for the data of data file at least one UE in radio circuit by applying broadcasting session in BM-SC.

In this example, in Fig. 5 can BM-SC place perform for by broadcast session in radio circuit at least one UE transmission data file method comprising: determine the data file that will send at least one UE in step 510.This decision can trigger because of such as receiving the instruction that will be sent to multiple UE from the data file of network node and this data file, and wherein the plurality of UE also can be called as MBMS client.

Once BM-SC has determined to send data file by broadcast mode, BM-SC has just determined the FEC redundancy rank that will use when sending data file, as shown in another step 520.FEC makes the recipient of data can correct any possible mistake in the data received.Generally speaking, when by air transmission data, the quality possibility difference of transmission channel is very large, and the channel quality of difference may cause losing some data blocks (multiple bit or symbol).By adopting FEC, add additional bit or symbol by transmit leg entity to the data that will send.The data bit that the symbol added is selected as making the recipient of data that the bit of this interpolation or symbol can be used to recover to lose in the transmission or data symbol.

The method also comprises: send at least one UE described and use the data file of determined FEC redundancy rank and the instruction to determined FEC redundancy rank, as shown in another step 530.

According to an alternative, said method can also comprise: with determined FEC redundancy grade renewal (file delivery table) FDT example, as shown in optional step 525, wherein, the FEC redundancy rank of this renewal sends to UE in FDT example.

When BM-SC starts to the transmission of UE or eMBMS client or broadcast data packets, BM-SC sends the user's service describing comprising necessary information.During broadcast session, BM-SC also sends the FDT example for describing file object that is that send or broadcast.UE or eMBMS client can use FDT example to decode the packet recovery file object that receive.By with determined FEC redundancy grade renewal FDT example, BM-SC makes this information can be issued to the UE receiving the data file broadcasted.

In this example, the data of at least one UE be sent to be associated with FDT example, and wherein data file is divided into grouping, and each grouping is associated with this FDT example.

FLUTE FDT example describes the file object of sending or broadcasting, and provides the information about data file segmentation to UE.Usually, data file may be very large, and must be divided into grouping or symbol.In this example, each grouping of the data file that send is associated with FDT example.

Alternatively, the method of Fig. 5 can also comprise another optional step 540, the information of this data file of cannot successfully decoding from least one UE reception at least one UE described to BM-SC instruction UE when applying the FEC redundancy rank for sending this data file, this information also indicates packet loss rate.

According to an embodiment, the information of this data file of cannot successfully decoding from least one UE reception at least one UE described to BM-SC instruction UE comprises: receive the reception report request indicating packet loss rate to BM-SC.

In this way, existing message is used to the information passing on the grouping receiving the decode broadcast that to fail about UE to BM-SC, and passes on the information about packet loss rate.

UE uses FDT example to decode the FLUTE Object group/symbol and recovery file object that receive.UE utilizes the FEC redundancy rank comprised to decode to the grouping received or symbol.As will be explained below, when UE cannot successful decoded packet, UE to fail the grouping of decoding broadcast to BM-SC notice.UE also indicates packet/symbol Loss Rate to BM-SC.

If to receive instruction at BM-SC place according to step 540 to fail the information of decoded data file, then BM-SC can continue the method with numerous alternate ways, this can depend on present case and/or selected configuration, will be described in Fig. 6 a-6d now.

According to an embodiment, as shown in another step as the step 610 in Fig. 6 a, BM-SC determines to increase FEC redundancy rank, and continues to send to UE to use the follow-up grouping of the data file of the FEC redundancy rank increased and to the instruction of FEC redundancy rank after this using increase.

UE is indicated cannot successfully to decode the information of this data file from least one UE at least one UE described to BM-SC because BM-SC receives, so BM-SC knows the grouping of the data file of the broadcast that the too low so that UE of FEC redundancy rank cannot successfully decode.This may be because channel quality is too poor, makes the grouping broadcasted become some and damages or damage and to a certain degree make UE use current FEC redundancy rank can not correct mistake in grouping.

BM-SC in this example determines to increase FEC redundancy rank, thus with use compared with lower or current FEC redundancy rank, UE can correct the more how mistake in broadcast and the grouping that receives.This likely overcomes the grouping such as damaged shortcoming to restoring due to the channel quality of difference of broadcast, this is because FEC redundancy rank is higher, the mistake that recipient can correct is more.

Because change now (being increase in this example) FEC redundancy rank, after this BM-SC must use the FEC redundancy rank of this increase to UE instruction.This can come by again upgrading FDT example based on current FEC redundancy.

By this way, because BM-SC sends the FDT example for describing file object that is that send or that broadcast or grouping, all UE receiving broadcast know the redundancy rank of this new increase.Then UE can use FDT example to decode the FLUTE object that receives and recover this file object.By the FEC redundancy grade renewal FDT example with increase, BM-SC can send this information to the UE receiving the data file broadcasted.Thus, FEC redundancy rank needs not to be constant or static state during broadcast session, but can be dynamic, to meet the condition of possible change, thus the change of REC redundancy during obtaining broadcast session.

According to another embodiment, BM-SC changes the step in application drawing 6b into, namely BM-SC determines to stop the transmission to the data file of at least one UE described, and send the information about stopping data transmission at least one UE described, as shown in step 615, and these data are sent the time point be rescheduled to after a while, as shown in another step 620.

These data can be sent the time point be rescheduled to after a while by BM-SC.Because the channel quality in radio or wireless communication system may have sizable change along with the time, so BM-SC can suppose that UE reports that the reason of failing to decode the grouping broadcasted is due to the deterioration of temporary transient channel quality.Therefore, at time point after a while, channel quality may improve, and therefore these data are sent the time point be rescheduled to after a while by BM-SC.

BM-SC can receive from different UEs quite large quantity to BM-SC notify UE cannot successfully decode from the instruction of the broadcast packe of BM-SC.In this example, BM-SC can determine to stop the transmission to the data file of at least one UE described.This is the alternative for increasing FEC redundancy rank.

Once BM-SC determines to stop the transmission to the data file of at least one UE described, at least one UE described, BM-SC notifies that stopping these data sends.By this way, UE can become and know that they should or not need to intercept more groupings that will be received by broadcast session.So UE can take suitable action, such as, abandon all groupings of this data file received so far simply, or request sends this data file.

About how selecting the rule of correct alternative can be pre-defined by operator.Such as, if there are 1000 potential file repair request for a session, then window can be repaired by file lengthen by operator, if there are 10000 potential file repair request, then operator can select to cancel the file reparation for this delivery session.

According to another embodiment, BM-SC can change into as shown in fig. 6 c, determines that extendfile repairs window, and the file of expansion is repaired window and be applied to follow and send any file after stopping in ongoing data file and repair session.This alternative is as shown in the step 625 in Fig. 6 c.

BM-SC receives the instruction of grouping of broadcast of this data file of decoding that to fail from the instruction of multiple UE.The another of transmission as the FEC redundancy rank or termination data file that increase data file substitutes, and BM-SC can determine that expanding the file of following after the data transfer termination at least one UE described repairs window.This means, UE can use file repair procedures at the time durations longer than the default time for file repair procedures.BM-SC can consider will the number of UE repaired of demand file, because this is instruction according to the grouping of the decoding broadcast that fails received and known.If the number (namely needing the quantity of the UE of file repair procedures) that session repaired by each file can not make network over loading, and if current file to repair window too short and do not allow the reparation of all UE execute files, then BM-SC can upgrade ADPD xml and repairs window with extendfile.When BM-SC upgrades ADPD xml, the ADPD xml after BM-SC clean culture or broadcast upgrade, so that extendfile repairs window.

According to another embodiment, as shown in the step 630 in Fig. 6 d, BM-SC can change into determining to cancel to follow and send the reparation of the file after stopping window to the data of at least one UE described.

What BM-SC may receive relatively large amount shows to fail the instruction of grouping of decoding broadcast from UE.When there is a large amount of this instructions, BM-SC can suppose that file repair procedures may make network over loading.In order to avoid any overload condition, BM-SC changes into and determines that cancelling file repairs window.This may cause some UE can not successfully receive complete data file.

Operator can cancel file reparation window by sending the user's service fragment after upgrading via service discovery channel.

According to another embodiment, BM-SC can change into as shown in the step 630 in Fig. 6 e, preserve about the UE reporting this data file of decoding that fails number and be intended to receive the information of packet loss percentage of the UE at least one UE of this data file, and after sending termination to the data of at least one UE described, based on preserved information, retransmit the reparation symbol of particular percentile.Alternatively, another time slot in broadcast session can be used to retransmit this file.

In this example, BM-SC can also cancel file and repair window, and changes into: the reparation symbol retransmitting particular percentile after sending termination to the data of at least one UE described, or uses another time slot in broadcast session to retransmit this file.By this way, avoid because the risk that session causes network over loading repaired by file repair request and file.In addition, if retransmitting to repair symbol or use another time slot in broadcast session to retransmit this file after sending termination to the data of at least one UE described to make UE can recover data file when not utilizing file repair procedures, then can saving resource.

The file reparation that the support of eMBMS download session is sent for on-demand content.If operator or BM-SC can know potential file repair request quantity before the file reparation of reality starts, then operator or BM-SC can take different action, such as, in following any one: extend and repair window; Or by announce another sky associating delivery process (ADP) or upgrade schedule fragment with represents operator or BM-SC wish UE or eMBMS client file repair window startup before cancel ADPD process, cancel the reparation of point-to-point (P2P) data file.If there is the too many end user failing to recover data file object, then operator or BM-SC can dispatch another broadcast service for this download session.

Fig. 7 a and 7b illustrates the flow chart that can receive the example of the method for the broadcast session of the transmission data file from BM-SC that can perform at UE place.

According to the embodiment described with reference to figure 7a, as indicated by step 710, UE is receiving the transmission from BM-SC, and this transmission comprises data file and the instruction to the FEC redundancy rank for sending data, and wherein FEC redundancy rank causes adding expense in received data; And, as shown in step 720, use indicated FEC redundancy rank to decode to the transmission received.

UE receives the transmission comprising data file and the instruction to the FEC redundancy rank for sending these data from BM-SC.This means that UE had both received the broadcast transmission of the data file of carrying out with the form of at least one packet.UE also receives the instruction to the FEC redundancy rank for sending data.So UE can use this FEC redundancy rank, successfully to decode the grouping or data file that receive.If the grouping received or data file comprise the error rate lower than FEC redundancy rank, then UE can correct the mistake in grouping or data file, with this grouping or the data file of successfully decoding.

Method in this UE can have some advantages.An advantage is: FEC redundancy class information is delivered to UE, and makes UE can determine from how many groupings in the data file of BM-SC be successfully received and have how many groupings not to be successfully received.Once packet loss has exceeded FEC redundancy rank and before FDT example expires, UE can trigger action early.A () is for demblee form (dash) flow transmission, if FEC redundancy class information is included, then UE can be made in the packet loss of fragment more than the quick decision losing this whole fragment when FEC redundancy rank.Make UE can take action early when this fragment cannot be recovered.Otherwise UE must wait and reach FDT example time expiration, can take any action.B (), for on-demand content, when the packet loss rate of UE is more than FEC redundancy rank, means that UE needs execute file repair process or session.UE can repair at file the forward direction BM-SC that window starts and notify file reparation on the horizon.BM-SC can use this statistics to determine how (to repair the phase by file lengthen or to pass through to cancel file repair procedures or session) and prevent from repairing storm.This is very useful, and it especially contributes to operator or BM-SC prevents the potential network unicast storm sending (such as Android upgrades) for large files from transshipping.

According to embodiment, data file is associated with FDT example, and wherein this data file is divided into grouping, and each grouping is associated with FDT example, and wherein FDT example comprises FEC redundancy class information.

Before BM-SC starts to divide into groups to the transmission of UE or eMBMS client or broadcast FLUTE, BM-SC sends the user's service describing comprising necessary information.During broadcast session, BM-SC also sends the FDT example for describing the file object of sending or broadcasting.UE or eMBMS client can use FDT example to decode the FLUTE Object group recovery file object that receive.By with determined FEC redundancy grade renewal FDT example, BM-SC makes this information can be issued to the UE receiving the data file broadcasted.

Once UE has received FEC redundancy rank, this information can be used to determine that whether decoding is successful, as indicated by step 730.As described above, UE uses this FEC redundancy rank to decode the grouping or data file that receive.

If determine the decoding of the transmission received unsuccessful in step 730, then the information of cannot successfully decode to BM-SC transmission instruction UE this data file or grouping, as indicated by step 740.The information sent can comprise reception report request, indicates packet loss rate to BM-SC.In addition, UE can also be made a response to this given scenario by following manner: after broadcast session stops, session is repaired in request and the file of BM-SC to BM-SC instruction, to receive the re-transmission of those groupings to the unsuccessful decoding indicated to BM-SC.This is by shown in optional step 750.

In this way, BM-SC knows that demand file is repaired session or process by UE after broadcast session stops.This makes BM-SC can take suitable action.As mentioned above, if the relatively many UE received in the UE of the data file broadcasted show that they are by demand file reparation, then BM-SC can determine: such as increase FEC rank, and extendfile repairs window, or cancels file reparation window.

In this way, existing message is used to the information passing on the grouping receiving the decode broadcast that to fail about UE to BM-SC, and passes on the information about packet loss rate.

If receive more data, then the method can continue as shown in the branch C in Fig. 7 a and 7b, if but do not receive more data, then the method continues as shown in the branch B in Fig. 7 a and 7b, as shown in step 660, and will hereafter further describe.

Except above-described method step, UE based on the understanding to dynamic FEC redundancy rank, can perform other step, is described referring now to Fig. 7 b.According to the step 770 of Fig. 7 b, UE determines the ratio between the number of the grouping that not yet success is decoded and the number of grouping received, and in step 780 subsequently, determine the relation between FEC redundancy rank and determined ratio.UE receives multiple grouping, all parts of the same data file namely broadcasted from BM-SC to UE.Some groupings may be successfully decoded, and some groupings may unsuccessful decoding.UE determines packet loss rate, and it represents with percentage and is the sum of number divided by the grouping received of the grouping of unsuccessful decoding.

If determine that in next step 790 this ratio is higher than FEC redundancy rank, namely the relative populations of the grouping of unsuccessful decoding is greater than the quantity that can be processed by application FEC, and therefore do not enable file reparation for sent data file, UE can infer that it can not successfully receive the decode this data file.If this is the case, then UE keeps the more groupings receiving this data file will be waste resource.Therefore, as shown in step 800, so UE is by determining the reception stopping or stop ongoing other groupings to the same data file in this broadcast session, unless file reparation is activated.File repair procedures is only sent for the on-demand content via broadcast and is just enabled.But as explained above, BM-SC has following option: cancel file and repair window, thus forbidding file repair procedures.

The BM-SC being suitable for sending data at least one UE in radio communications system via broadcast session is described in further detail referring now to Fig. 8, wherein, BM-SC 800 comprises processor 810 and can store the computer-readable memory 820 of computer-readable instruction, described computer-readable instruction makes processor 810 when being performed by described processor: send data at least one UE 1000 described, and determine FEC redundancy rank, this FEC redundancy rank sends explicitly with transmission data.In addition, computer-readable instruction also can make processor 810 perform above with reference to the arbitrary steps in the alternative approach step of any accompanying drawing suggestion in Fig. 5 or Fig. 6 a-6e.

More specifically, executable instruction is configured such that they make processor 810 upon being performed: determine to there is the data file that will send at least one UE; Determine FEC redundancy rank, its instruction will be applied to the FEC amount of redundancy of data to be sent; And send data and the instruction to FEC redundancy rank via transmitting element 830 to one or more UE.

In addition, executable instruction can make processor 810: by being inserted into the FDT example of renewal to the instruction of FEC redundancy rank, as FEC redundancy level attribute, via transmitting element 830, the FDT example of renewal is sent to one or more UE after this.

In addition, executable instruction can make processor 810: make response to via receiving element 840 from cannot the decode information of the data received of the instruction that at least one UE receives with numerous alternate ways.

According to the first embodiment, executable instruction makes processor 810: increase FEC redundancy rank, to send the instruction showing the FEC redundancy rank after this using increase to UE, and continue to use the FEC redundancy rank of this increase to send the follow-up grouping of this data file.

According to the second embodiment, executable instruction changes into and makes processor 810: the data file stopped at least one UE 1000 sends; And, send the information about stopping the transmission of these data at least one UE 900.

According to the 3rd embodiment, executable instruction changes into and makes processor 810: extendfile reparation window, and the file reparation window after expansion is applied to any file reparation session of following after ongoing data file sends termination.

According to the 4th embodiment, executable instruction makes processor 810: cancel following sending the reparation of the file after stopping window to the data of at least one UE 1000.

According to the 5th embodiment, executable instruction makes processor 810: preserve about the UE reporting this data file of decoding that fails number and be intended to receive the information of packet loss percentage of the UE at least one UE of this data file, and after sending termination to the data of at least one UE described, based on preserved information, retransmit the reparation symbol of particular percentile.Alternatively, another time slot in broadcast session can be used to retransmit this file.

Alternatively, computer-readable memory 820 can be arranged to computer program 820a, and it comprises computer-readable medium and computer program 850, and computer program 850 comprises executable instruction as above.This computer program 820a can be form that is non-volatile or volatile memory, as Electrically Erasable Read Only Memory (EEPROM), flash memory, random access memory (RAM) or disk drive, but not the form of signal or any type of electromagnetic wave.This computer program 820a can also comprise long-time memory 860, and it can be such as single memory in following memory or combination: the memory of magnetic memory, optical memory, solid-state memory or even Remote Installation.

Shown in positive composition graphs 9, alternative BM-SC 900 can comprise processing unit 910, memory 920, transmitting element 930 and receiving element 940, and it is operably connected can perform the function corresponding with the layout described with reference to figure 8 above.The processing unit 910 of Fig. 9 can comprise the module be operatively connected or the unit of suitable number, as: receiver module 911, for receiving data from UE; Determination module 912, for determining when amendment FEC redundancy rank; Sending module 913, for sending data to UE; Update module 914, for correspondingly upgrading FEC redundancy rank; And scheduler module 915, for dispatching the flow that will arrive, the impact of the FEC redundancy rank that it may be upgraded.

And the UE that can perform any method in said method needs to carry out corresponding adaptability revision.According to an embodiment, the UE being suitable for receiving the broadcast session sending data from BM-SC800 above-mentioned is described with reference to Figure 10.UE 1000 comprises processor 1010 and memory 1020, memory 1020 can store instruction, described instruction makes processor 1010 when being performed by processor 1010: receive the transmission from BM-SC 800, and this transmission comprises data file and the instruction to the FEC redundancy rank for sending data; And, use indicated FEC redundancy rank to decode to the transmission received.

In another example, data file is associated with file delivery table (FDT) example, and wherein, data file is divided into grouping, and each grouping is associated with FDT example, and wherein FDT example comprises FEC redundancy class information.

In another example, memory 1020 can also store such instruction, described instruction makes processor 1010 when being performed by processor 1010: the FEC redundancy rank according to receiving is decoded to the grouping received or data file, wherein, if unsuccessful to the decoding of the transmission received, then processor 1010 is also suitable for sending instruction UE1000 to BM-SC 800 and cannot successfully decodes the information of this data file or grouping.

According to embodiment, send cannot successfully the decode information of this data file or grouping of instruction UE 1000 to BM-SC 800 and comprise: the reception report request sending instruction packet loss rate to BM-SC 800.

In another example, memory 1020 can also store such instruction, and described instruction makes processor 1010 when being performed by processor 1010: receive multiple grouping; Ratio between the number determining the grouping of unsuccessful decoding and the number of grouping received; Determine the relation between the redundancy rank that FEC encodes and determined ratio; And if described ratio is higher than FEC redundancy rank, then processor 1010 is suitable for, in the reception for other groupings stopped when sent data file not enabled file reparation the same data file in this broadcast session.

In another example, memory 1020 can also store such instruction, described instruction makes processor 1010 when being performed by processor 1010: indicate to BM-SC 800, after this broadcast session stops, session is repaired in request and the file of BM-SC, to receive re-transmissions of those groupings to the unsuccessful decoding indicated to BM-SC.

Alternatively, computer-readable memory 1020 can be arranged to computer program 1020a, and computer program 1020a comprises computer-readable medium and computer program 1000, and computer program 1000 comprises executable instruction described above.Computer program 1020a can be form that is non-volatile or volatile memory, as Electrically Erasable Read Only Memory (EEPROM), flash memory, random access memory (RAM) or disk drive, but not the form of signal or any type of electromagnetic wave.This computer program 1020a can also comprise long-time memory 1060, and it can be such as single memory in following memory or combination: the memory of magnetic memory, optical memory, solid-state memory or even Remote Installation.

As illustrated in conjunction with Figure 11, as an alternative, the UE 1100 comprising processing unit 1110, memory 1120, transmitting element 1130 and receiving element 1140 can be operably connected, with the function that the layout performed with describe with reference to Figure 10 is above corresponding.The processing unit 1110 of Figure 11 can comprise the module be operatively connected or the unit of suitable number, as: receiver module 1111, for receiving data from BM-SC 900; Decoder module 1112, for the decoding data received from BM-SC 900, and for determining decoding quality; Sending module 1113, for sending data to BM-SC 900; And determination module 1114, for performing any one in above-mentioned determining step based on the configuration of UE 1100.

Although describe embodiment according to some embodiments, should anticipate after having read specification and have studied accompanying drawing, their alternative, amendment, displacement and equivalent will become obvious.Therefore, intention be appending claims comprise fall into embodiment and claims co-pending scope within these substitute, amendment, displacement and equivalent.

Claims (32)

1. the method performed in heart BM-SC in a broadcast multicast service, described method is used for sending data at least one user equipment (UE) in radio communications system in broadcast session, and described method comprises:

Determine that (510) send data at least one UE;

Determine (520) forward error correction FEC redundancy rank, described FEC redundancy rank instruction will be applied to the FEC amount of redundancy that described data send; And

(530) described data and the instruction to described FEC redundancy rank is sent to described UE.

2. method according to claim 1, the wherein said instruction to described FEC redundancy rank is inserted into the file delivery table FDT example of renewal, as FEC redundancy level attribute, the FDT example of described renewal is after this sent out (530) to described UE.

3., according to the method for claim 1 or 2, also comprise step:

Receive (540) from the information of at least one UE at least one UE described, described information indicates this UE cannot successfully to decode sent data according to applied FEC redundancy rank to BM-SC.

4. method according to claim 3, wherein said receiving step comprises: receive the instruction to packet loss rate.

5. according to the method for any one in claim 1,2 or 3, also comprise step: by following manner, the information received about described data of cannot decoding from least one UE in described UE is responded:

Determine that (610) increase the FEC redundancy rank being used for follow-up data and sending; And

The instruction to the FEC redundancy rank upgraded is sent to described UE.

6., according to the method for any one in claim 1-4, comprising:

Determine that (615) stop to send to the data of at least one UE described; And

The information about described termination is sent to each UE corresponding.

7. method according to claim 6, also comprises step:

The transmission of stopped data will be rescheduled to (620) to time point after a while.

8., according to the method for any one in claim 1-4, comprising:

Determine that window repaired by the file of (625) expansion application during described data send; And

The file of expansion is repaired window and be applied to follow-up data transmission.

9., according to the method for any one in claim 1-4, comprising:

Window repaired by the file cancelling application during described data send.

10., according to the method for any one in claim 1-4, comprising:

Preserve (630) about report fail decoded data UE number and be intended to the information of packet loss percentage of at least one UE received at least one UE described in the data that send; And

Based on preserved information, retransmit the reparation symbol of particular percentile, or

Use another time slot data retransmission.

11. 1 kinds of methods performed in user equipment (UE), described method is for receiving from the data the broadcast session of broadcast/multicast service center BM-SC transmission, and described method comprises:

The data that (710) send and the FEC redundancy rank applied when sending described data is received from described BM-SC; And

Use the FEC redundancy rank received to received decoding data (720).

12. methods according to claim 11, wherein provide in file delivery table FDT example the instruction of described FEC redundancy rank.

13., according to the method for claim 11 or 12, also comprise step:

Determine whether (730) can successfully decode sent data; And

Under described decoding is considered to unsuccessful situation, send to described BM-SC the information that (740) indicate sent data of cannot decoding.

14. methods according to claim 13, wherein said transmission (740) comprising: the packet loss rate indicating described transmission.

15., according to the method for any one in claim 11-14, also comprise step:

Determine the ratio between the number of the grouping of the unsuccessful decoding in the data that (770) send and the number of successful grouping of decoding;

Determine the relation between (780) described FEC redundancy rank and determined ratio; And

If described ratio is higher than described FEC redundancy rank and for sent data not enabled file reparation, then stop (800) reception to any other grouping of sent data.

16., according to the method for any one in claim 11-15, also comprise step:

(750) are indicated by demand file reparation after the termination of initiated broadcast session, to receive the data of unsuccessful decoding in asked file repair procedures to described BM-SC.

17. 1 kinds of BM-SC (800), for sending data via broadcast session at least one UE (1000) in radio communications system, described BM-SC (800) comprises processor (810) and computer-readable memory (820), described computer-readable memory (820) can store instruction, and described instruction makes described processor (810) when being performed by described processor (810):

Determine to send data to described at least one UE (1000);

Determine the FEC redundancy rank that will be used for described transmission; And

The application described data of determined FEC redundancy rank and the instruction to determined FEC redundancy rank is sent at least one UE described.

18. BM-SC according to claim 17 (800), wherein said processor (810) is also suitable for carrying out transaction file by determined FEC redundancy rank and sends table FDT example.

19. BM-SC according to claim 18 (800), wherein said memory (820) can also store instruction, described instruction makes described processor (810) when being performed by described processor (810): receive information from least one UE (1000) at least one UE described, described information cannot successfully to be decoded described data file to described at least one UE (1000) of described BM-SC (800) instruction according to being applied to the FEC redundancy rank sending described data file, and described information also indicates packet loss rate.

20. BM-SC according to claim 19 (800), the information of described data file of wherein cannot successfully decoding from least one UE (1000) reception at least one UE described to described at least one UE (1000) of described BM-SC (800) instruction comprises: receive the reception report request indicating packet loss rate to described BM-SC (800).

21. according to the method for any one in claim 18-20, wherein said memory (820) can also store instruction, and described instruction makes described processor (810) when being performed by described processor (810): determine to increase FEC redundancy rank; And, continue to use the follow-up grouping of the described data file of the FEC redundancy rank increased and to after this will the instruction of FEC redundancy rank of the described increase of application to the transmission of described at least one UE (1000).

22. according to the method for any one in claim 18-20, wherein said memory (820) can also store instruction, and described instruction makes described processor (810) when being performed by described processor (810): determine that the data file stopped to described at least one UE (1000) sends; And, send suspended information to the transmission of described at least one UE (1000) about described data.

23. BM-SC according to claim 22 (800), wherein said memory (820) can also store instruction, and described instruction makes described processor (810) when being performed by described processor (810): described data are sent the time point be rescheduled to after a while.

24. according to the BM-SC (800) of any one in claim 18-20, wherein said memory (820) can also store instruction, and described instruction makes described processor (810) when being performed by described processor (810): determine that expansion is followed and sending the reparation of the file after stopping window to the data of described at least one UE (1000); And the file of expansion reparation window is applied to the file reparation session of following after the transmission of described data file stops.

25. according to the BM-SC (800) of any one in claim 18-20, wherein said memory (820) can also store instruction, and described instruction makes described processor (810) when being performed by described processor (810): determine that cancellation should be followed and sending the reparation of the file after stopping window to the data of described at least one UE (1000).

26. according to the BM-SC (800) of any one in claim 19-24, wherein said memory (420) can also store instruction, and described instruction makes described processing unit (430) when being performed by described processing unit (430): preserve about report fail decode described data file UE number and be intended to receive the information of packet loss percentage of at least one UE at least one UE described in described data file; And, after sending termination to the data of at least one UE described, retransmit the reparation symbol of particular percentile based on preserved information, or use another time slot in described broadcast session to retransmit described file.

27. according to the BM-SC (800) of any one in claim 17-26, and wherein said BM-SC (800) is broadcast/multicast service center BM-SC.

28. 1 kinds of subscriber equipment (1000) UE, be suitable for receiving the broadcast session from the transmission data file of broadcast/multicast service center (800) BM-SC, described UE (1000) comprising: processor (1010) and memory (1050), described memory (1050) can store instruction, and described instruction makes described processor (1050) when being performed by described processor (1050):

Receive from described BM-SC (800) and send, described transmission comprises described data file and the instruction to the FEC redundancy rank for sending described data; And

Indicated FEC redundancy rank is used to decode to received transmission.

29. UE according to claim 28 (1000), wherein said memory (5020) can also store instruction, described instruction makes described processor (1010) when being performed by described processor (1010): decode to received grouping or data file according to received FEC redundancy rank, wherein, if unsuccessful to the decoding of received transmission, then described processor (1010) is also suitable for sending the described UE of instruction (1000) to described BM-SC (800) and cannot successfully decodes the information of described data file.

30. UE according to claim 29 (1000), wherein send cannot successfully the decode information of described data file of the described UE of instruction (1000) to described BM-SC (800) and comprise: the reception report request sending instruction packet loss rate to described BM-SC.

31. according to the UE (1000) of any one in claim 28-30, wherein said memory (1050) can also store instruction, and described instruction makes described processor (1010) when being performed by described processor (1010): receive multiple grouping; Ratio between the number determining the grouping of unsuccessful decoding and the number of grouping received; Determine the relation between described FEC redundancy rank and determined ratio; And, if described ratio is higher than described FEC redundancy rank and for sent data file not enabled file reparation, then stop the reception of other groupings to the same data file in described broadcast session.

32. according to the UE (1000) of any one in claim 28-31, wherein said memory (1050) can also store instruction, described instruction makes described processor (1010) when being performed by described processor (1010): will ask to repair session with the file of BM-SC (800) after described broadcast session stops to described BM-SC (800) instruction, to receive the re-transmission to those groupings being designated as unsuccessful decoding to BM-SC (800).