CN104620525B - Method and apparatus for distributing information during broadcast delivery - Google Patents

Abstract

Provide the BM SC in radio communications system and it is therein for by broadcast session come to the method for at least one UE transmission datas file and UE and it is therein for receive the transmission data file from BM SC broadcast session method.Method in BM SC includes：It determines at least one UE and sends the data file；And determination will be used for the FEC redundancy ranks of the transmission.The method further includes：It is sent at least one UE using the data file of identified FEC redundancies rank and the instruction to identified FEC redundancies rank.

Description

Method and apparatus for distributing information during broadcast delivery

Technical field

This disclosure relates in a wireless communication system broadcast message and can handle this broadcast message BM-SC and UE。

Background technology

Multicast broadcast multimedia service (MBMS) is the broadcast service provided via cellular network.Correspondingly, enhancing MBMS (eMBMS) be used to name the MBMS service in the grouping system of evolution, the grouping system of the evolution include：For The universal terrestrial radio of the evolution of long term evolution (LTE) cellular network accesses net (E-UTRAN) and is directed to such as General Mobile The UTRAN of telecommunication system (UMTS) cellular network etc..It is shown in FIG. 1 one of the eMBMS solution frameworks based on LTE Simplification example.

The framework 100 of Fig. 1 includes that at least one broadcast/multicast service center (BM-SC) 110, BM-SC 110 is can to lead to The content that distribution is provided by one or more content and service provider 120 is crossed to provide the entity of MBMS or eMBMS, wherein interior Hold service provider 120 and generally includes content library (not shown) and real-time encoder (not shown), it can be in broadcast operation function To BM-SC for example in the form of satellite feed, in real time feeding and/or content delivery network (CDN) are fed under 130 supervision 110 provide content feeds, which usually can interact with BM-SC 110.BM-SC 110 is via more Media broadcast multicast gateway (MBMS-GW) 150 is connected to access net, and access net generally includes multiple access nodes, but is Here represented by single access node (base station 140) for the sake of simple, wherein eNB 140 can via it is unicast or multicast will The content feeds provided are distributed to the user equipment (UE) in the range of the access net.Herein, such UE is by single UE (UE 160) is represented.

In order to remedy fail that content feeds are correctly received by least one UE, above-mentioned framework is further typically provided with this The function of sample is configured such that BM-SC 110 can not receive at least part of of content feeds to those reports UE 160 retransmits partial content feeding.Such function is commonly known as file reparation, or is more specifically known as HTTP unicast texts Part reparation.For supporting file reparation, BM-SC 110 to be therefore usually provided at least one (but typically multiple) file reparation Server (not shown), the file repair server can be by way of retransmitting the data being previously sent to each request UE Loss in content feeds or the file fragment of damage are provided.

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

1. the mobile phone for the high aggregation into stadium delivers such as sports tournament video content.EMBMS systems System can use MBMS download delivery methods, such as file transmission of the User Datagram Protocol UDP/ based on one-way transmission (FLUTE), as the agreement for delivering live streaming TV contents to terminal.According to HTTP real time flow mediums (HLS) agreement or root of apple It is used as file by MBMS downloads according to the media fragment of DASH to be delivered.

Android 2. (Android) newer distribution.EMBMS systems can use MBMS download delivery methods (UDP/ FLUTE) the agreement as the popular file of delivering, the prevalence file is such as：Android update, YouTube video preload or Grave news event.

In the disclosure, term " terminal ", " MBMS receivers ", " MBMS clients " and UE be used to indicate can as this The text device or equipment for receiving the broadcast transmission via MBMS or eMBMS.

MBMS downloads the data file delivering supported in unidirectional MBMS carryings, and by being improved using FEC technologies The reliability of file reception.However, although having used FEC, it cannot be guaranteed that 100% reliability of data file delivering.

Therefore, other two kinds of error recovery methods are defined, and optionally, both error recovery methods can be It is used after terminating MBMS and sending.Using point-to-point (PTP) Ile repair method, unsatisfied UE can be obtained using HTTP The data of loss.Point-to-multipoint (PTM) Ile repair method allows BM-SC to be sent after actual MBMS data transmission more MBMS data.However, the MBMS service layer specification is not defined any combinations or sequence of Ile repair method.

MBMS downloads can be used for delivering any number of data file from single source to multiple UE.MBMS downloads can make File delivery is carried out with FLUTE [RFC3926] agreement.FLUTE is designed to the delivering of the mass file based on one way link, Such as digital broadcasting.Because HTTP and TCP is infeasible for PTM communications, agreement newly developed is used.Below With reference to the description of figure 2 typical eMBMS FLUTE transmission according to prior art.

According to fig. 2, it is to be shown respectively in a simplified manner in BM-SC 200 and support the UE of MBMS or eMBMS (herein By UE 220a, 220b indicate) between via the communication network (NW) 220 that can handle MBMS or eMBMS MBMS or The signaling diagram that eMBMS is downloaded.According to hereafter, it is to be interpreted as meaning MBMS or eMBMS to referring to for MBMS, and UE can be with It is alternatively referred to as MBMS or eMBMS clients.In fig. 2, such network infrastructure is by NW 220 is connected to BM- What the gateway (GW) 210 of SC 200 indicated, to provide the access between UE220a, 220b and BM-SC 200.

In first step 200, MBMS carryings, and the MBMS sessions by BM-SC 200 are established.It to be received by UE All Files require list item in FLUTE file deliveries table (FDT), be to be provided using FLUTE FDT examples.In It is that user equipment 220a, 220b can use the FDT examples retrieved, to decode the FLUTE objects then received grouping simultaneously And restore corresponding file object.

Therefore, UE 220a, 220b can：The first FDT examples sent by BM-SC 200 are received in step 200, And then one or more files together with forward error correction (FEC) data are received in subsequent step 220.Forward error correction FEC structures Part defines such as FEC code (RFC3452) and Object Segmentation mechanism.Object Segmentation mechanism, which describes, divides object data It is grouped payload at UDP.Each file will be encoded that there are one FEC to encode ID, and generate source code symbol and repair and accord with Number.The FEC applied is included in corresponding FDT examples.

Described process is usually repeated and (is shown herein with step 230 and 240), until MBMS sessions are sent (stopping 250 by MBMS sessions herein to indicate).After having completed the transmission, UE 220a, 220b can report reception As a result the file reparation of the content to being properly received not yet and is asked in case of need.Such request is with step 260 show, in step 260 UE 220a demand files reparation, and initiate file repair procedures in subsequent step 270, from And any UE (being UE 220a herein) is allowed to have second of chance to receive the file content lost, to obtain to requested The successful reception of file content.In case of need, UE 220b can also be directed to and executes identical process.

Before BM-SC 200 starts to send or broadcast FLUTE groupings to UE 220a, 220b, BM-SC 200 needs to send out Go out the user service comprising necessary information to describe.During delivery session, BM-SC 200 also needs to send out for describing delivering text The FDT examples of part object, this is already mentioned above.

UE 220a, 220b can know file size, FEC coding ID and FEC segmentation letters using FDT example informations Breath.However, since FLUTE is based on UDP, usual UE 220a, 220b can not know which grouping is a data file The last grouping of object, unless meeting following conditions：

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

2. reaching FDT example time expirations.

In most cases, broadcast session will carry out broadcast data text with certain FEC expenses or FEC redundancy ranks Part, to improve the possibility successfully restored.But FDT examples do not describe the FEC expenses for being added to source file object or FEC redundancies Rank is how many.Two kinds of possible situations are described below.

Situation 1：In the case of real-time streaming transport, a delivering or broadcast session are without any associated for file The delivery process of reparation.As lack FEC expenses or FEC redundancy ranks as a result, even if packet loss rate has surpassed Applied FEC expenses or the FEC redundancy level percentages for a section are crossed, UE will keep receiving and be grouped.

Situation 2：In the case where on-demand content delivers, associated delivery process illustrates that (ADPD) program is to be directed to one What delivery session or broadcast session enabled.In this case, the source symbol that UE identifications are lost, and execute following steps：

Check that PTP file reparations are to be defined for MBMS download sessions (therefore, file is repaired parameter and is available)；

Wait until that file repair procedures can be activated, wherein UE calculate (random) Backoff time and (at random Ground) select file remediation server (BM-SC)；And

Client sends file repair request to selected file repair server.

The startup time for the MBMS file repair procedures downloaded is the time expiration of FDT examples at the latest.Time expiration It is to be provided by FDT examples " expired " XML attribute.

It provides for the MBMS fall-back modes downloaded and comes from about being not properly received during broadcasting transmission session When the recipient (i.e. UE) of certain data of MBMS senders (that is, BM-SC) can ask to repair the information of session.At random Period can be to be directed toward the pattern that UE should calculate the time window length for the random time for initiating file repair procedures on it To define.

Operator can not obtain may trigger file reparation for a download session or broadcast session how many user Best-guess repairs fall-back mode until having reached file, that is, as the broadcast delivery completion for the data file and UE When starting to send file repair request to one or more remediation servers.In some extreme environments, for same download There may be the file repair requests of magnanimity during the file reparation window of session.Such request mighty torrent can consume a large amount of unicast Bandwidth, and file repair server may risk prodigious overload risk.Prevent potential file from repairing mighty torrent for big text Part delivering (such as Android updates) is especially valuable, the reason is that small repair rate can still introduce big reparation amount in a network.

Invention content

The purpose of this document is：Eliminate or mitigate at least some of drawbacks described above defect.More specifically, providing use In providing FEC redundancy grade method for distinguishing and the corresponding FEC redundancy ranks as processing UE at from BM-SC to UE Method, and it is adapted for carrying out the BM-SC and UE of this method.

According in a first aspect, provide a kind of method executed in BM-SC, the method be used in broadcast session to At least one of radio communications system UE transmission datas.According to this method, determination will be at least one first at BM-SC The data that UE is sent.Then FEC redundancy ranks are determined, indicate the FEC amount of redundancy to be applied sent in the data, this Afterwards the data and instruction to the FEC redundancies rank are sent to one or more of UE.

The instruction to the FEC redundancies rank can be inserted into newer FDT examples, as FEC redundancies Level attribute, after this newer FDT examples be sent to one or more of UE.

The method can also include step：Receive the information from least one of at least one UE UE, institute It states information and indicates that transmitted data can not be successfully decoded according to the FEC redundancies rank applied by corresponding UE to BM-SC.

Other than the information type proposed by being received from corresponding UE, the receiving step may include：It also receives to dividing The instruction of group Loss Rate.

In addition, according to first embodiment, BM-SC can be by following manner to being received from least one UE about can not The information of the transmitted data of decoding is responded：Determine the FEC redundancy ranks for increasing and being sent for follow-up data；And The instruction to newer FEC redundancies rank is sent to one or more of UE.

According to second embodiment, alternatively, the BM-SC can be with：It determines and stops to send out to the data of at least one UE It send；And the information to corresponding each UE transmissions about the suspension.In addition, the BM-SC can be by the number to being stopped According to transmission be rescheduled to later point.

According to third embodiment, the BM-SC can be with：Determine the file reparation that extension is applied during the data are sent Window；And the file of extension is repaired into window and is sent applied to follow-up data.

According to fourth embodiment, the BM-SC can cancel the file applied during the data are sent and repair window.

According to the 5th embodiment, the BM-SC can be with：Preserve about report fail decoding data UE number with And it is intended to receive the information of the packet loss percentage of at least one of at least one UE of transmitted data UE； And based on the information preserved, the reparation symbol of particular percentile is retransmitted, or data are retransmitted using another time slot.

Provide a kind of method executed in UE according to another aspect, the method is used to receiving to be sent from BM-SC Data in broadcast session, wherein the UE is receiving what transmission was applied from the data of BM-SC and when sending the data FEC redundancies rank and the UE are decoded received data using the FEC redundancy ranks received.

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

Proposed method also typically includes step：Determine whether transmitted data can be successfully decoded；And in institute It states in the case of decoding is considered unsuccessful, the information of transmitted data can not be decoded by sending instruction to the BM-SC.

The forwarding step can also include：The packet loss rate of the transmission is indicated to the BM-SC.

In addition, proposed method can further include step：Determine the failed decoded grouping in transmitted data Number and the number for the grouping being successfully decoded between ratio；Determine the FEC redundancies rank and identified ratio it Between relationship；And if the ratio be higher than the FEC redundancies rank, and if be directed to transmitted data not enabled File reparation then stops the reception of any other grouping to transmitted data.

In addition, following processing can also be performed in the UE：The suspension in the broadcast session initiated is indicated to the BM-SC Demand file is repaired later, to receive failed decoded data in requested file repair procedures.

According to another aspect, a kind of BM-SC is provided, is used for via broadcast session into radio communications system extremely A few UE transmission data.The BM-SC includes processor and computer-readable memory, the computer-readable memory energy Enough store instructions, described instruction make the processor when being executed by the processor：It determines and is sent out at least one UE Send data；Determination will be used for the FEC redundancy ranks of the transmission；And it is determined at least one UE sending applications FEC redundancy ranks the data and instruction to identified FEC redundancies rank.

The processor is further adapted for identified FEC redundancies rank, i.e., by using the FDT examples used, To update file delivery table FDT examples.

The memory can be changed, enabling store instruction, described instruction make when being executed by the processor The processor：Information is received from least one of at least one UE UE, described information indicates institute to the BM-SC The data text can not be successfully decoded according to applied to the FEC redundancies rank for sending the data file by stating at least one UE Part, described information also indicate packet loss rate.

The BM-SC can be received from least one of at least one UE UE to BM-SC instructions it is described to The information of the data file can not be successfully decoded in a few UE, wherein this information includes：It receives to BM-SC instructions point The reception report request of group Loss Rate.

According to first embodiment, the memory can also store instruction, described instruction by the processor when being executed Make the processor：It determines and increases FEC redundancy ranks；And continue to send using increased at least one UE The follow-up of the data file of FEC redundancy ranks is grouped and to that hereafter will apply the increased FEC redundancies rank Instruction.

According to second embodiment, the memory can also store instruction, described instruction by the processor when being executed Make the processor：Determine the transmission stopped to the data file of at least one UE (1000)；And to it is described extremely A few UE (1000) sends sends suspended information about data.The memory can also store instruction, described instruction Make the processor when being executed by the processor：Data transmission is rescheduled to later point.

According to third embodiment, the memory can also store instruction, described instruction by the processor when being executed Make the processor：It determines that extension is followed and repairs window in the file sent to the data of at least one UE after terminating；With And the file of extension is repaired into the file that window is applied to after following the transmission in the data file to terminate and repairs session.

According to fourth embodiment, the memory can also store instruction, described instruction by the processor when being executed Make the processor：It determines to cancel to follow and is sending the file reparation after terminating to the data of at least one UE Window.

According to the 5th embodiment, the memory can also store instruction, described instruction executes by the processing unit When make the processing unit：It preserves about the number for reporting the UE for decoding the data file that fails and is intended to receive The information of the packet loss percentage of at least one of at least one UE of data file UE；And to institute After the data transmission termination for stating at least one UE, the reparation symbol of particular percentile is retransmitted based on the information preserved, or Person uses another time slot in the broadcast session to retransmit the file.

A kind of UE is provided according to another aspect, is suitable for receiving the broadcast meeting of the transmission data file from BM-SC Words.The UE includes：Processor and memory, the memory can store instruction, described instruction is by the processor (1050) make the processor (1050) when executing：It receives and sends from the BM-SC, the transmission includes the data file With the instruction to the FEC redundancy ranks for sending the data；And using indicated FEC redundancy ranks to being connect The transmission of receipts is decoded.

The memory can also store instruction, described instruction makes the processor when being executed by the processor： According to the FEC redundancies rank received the grouping received or data file are decoded, wherein if to being received The decoding of transmission is failed, then the processor is further adapted for not being successfully decoded to the BM-SC transmission instructions UE described The information of data file.

The UE can be configured as：It is also sent to the BM-SC and indicates that the data file can not be successfully decoded in the UE Information comprising to the BM-SC send instruction packet loss rate reception report request.

The memory can also store instruction, described instruction makes the processor when being executed by the processor： Receive multiple groupings；Determine the ratio between the number and the number of the grouping received of failed decoded grouping；Determine institute State the relationship between FEC redundancies rank and identified ratio；And if the ratio is higher than the FEC redundancies grade Not, and if being directed to delivered data file not enabled file reparation, stop to the same number in the broadcast session According to the reception of other groupings of file.

In addition, the memory can also store instruction, described instruction makes described when being executed by the processor Manage device：Session is repaired into request and the file of BM-SC after broadcast session termination to BM-SC instructions, to connect Receive the re-transmission that those of decoding grouping not successfully is designated as to warp-wise BM-SC.

Here BM-SC, UE and correlation method therein can have the advantages that several.One advantage is：FEC redundancy grades Other information is delivered to UE so that UE can determine how much groupings in the data file from BM-SC be successfully received and How many grouping is not successfully received.Once packet loss be more than FEC redundancies rank and FDT examples expire before, UE can trigger action early.(a) for demblee form (dash) steaming transfer, if FEC redundancies class information is by including UE Can be made in segment packet loss already exceed FEC redundancy ranks in the case of lose the fast quick decision of the whole fragment It is fixed.UE is enable to take action early in the case where the segment can not be restored.Otherwise, UE, which must be waited, reaches FDT examples Time expiration is likely to take any action.(b) for on-demand content, whenever the packet loss rate of UE is more than FEC redundancy grades When other, it is meant that UE needs to execute file repair procedures or session.It is logical that UE can repair the forward direction BM-SC that window starts in file Know upcoming file reparation.BM-SC can using the statistical data come determine how (by extend file repair the phase or Person cancels file repair procedures or session) it prevents from repairing storm.This is highly useful, and it be particularly useful to operator or BM-SC prevents the potential network unicast storm overload for big file delivery (such as Android updates).

Description of the drawings

Embodiment is will be explained in more detail in the drawings and in the description now, in attached drawing：

Fig. 1 is the system architecture for the network for supporting MBMS according to prior art.

Fig. 2 is the signaling for showing the typical MBMS download sessions between BM-SC and two UE according to prior art Scheme.

Fig. 3 be on by no more than the packet loss rate for the FEC redundancy ranks applied influenced by transmission file delivery Schematic diagram.

Fig. 4 be on by more than the packet loss rate for the FEC redundancy ranks applied influenced by transmission file delivery Schematic diagram.

Fig. 5 is the flow shown in the BM-SC methods for being used to determine FEC redundancies rank and providing it to UE executed Figure.

Fig. 6 a-6e are the flows for showing to have determined that the alternate ways of the process after FEC redundancy ranks at BM-SC Figure.

Fig. 7 a and 7b be show UE how can receive and using the FEC redundancy class informations received from BM-SC stream Cheng Tu,

Fig. 8 is to show according to first embodiment to be operable to BM-SC or the structure with the associated BM-SC of BM-SC Schematic diagram.

Fig. 9 is the structural schematic diagram for showing BM-SC according to second embodiment.

Figure 10 is to show according to first embodiment to be operable to UE or the structural representation with the associated BM-SC of UE Figure.

Figure 11 is the structural schematic diagram for showing UE according to second embodiment.

Specific implementation mode

In short, providing for from BM-SC to BM-SC, UE of the one or more data files of UE transmissions and accordingly Method, wherein indicate the FEC redundancy ranks for broadcasting the data file to recipient UE.

More specifically, the purpose of the disclosure is：A kind of method that describes BM-SC and can execute wherein, is used for By broadcast session come to UE transmission data files in radio circuit, wherein the network side in radio circuit is true Surely it is used for the FEC redundancies rank of the transmission or session and is indicated to (one or more) UE.Another purpose exists In：A kind of method that provides UE and can execute wherein is used to receive broadcast session as described above from network, wherein can answer FEC redundancy ranks for the transmission or session are indicated to UE.By providing FEC redundancy class informations, UE to UE It will be provided with and can be used on how to operate the information to make a policy to the session of initiation in early stage, to provide to net The more effective utilization of network resource.

Once BM-SC, which has been determined by broadcast, carrys out transmission data file, BM-SC is determined to the FEC for the transmission Redundancy rank.FEC enables the recipient of data to correct any possible mistake in the data received.It is general and Speech, when by aerial transmission data, the possible difference of quality of transmission channel is very big, and the channel quality of difference may result in Lose several data blocks (multiple bits or symbol).It is additional from sender's entity to the data to be sent addition by using FEC Bit or symbol.The symbol added is selected as so that the recipient of data will use the bit or symbol of the addition Number restore the data bit lost in the transmission or data symbol.

FEC redundancy ranks indicate " intensity " of used FEC.If FEC redundancy ranks are low, recipient can It can only restore a little bit or symbol.Therefore, low FEC redundancies rank usually uses in the following cases：Transmission letter The quality that road has had, it means that the data for being sent to recipient only have relatively little of bit drop-out.Similarly, if it is superfluous Remaining rank is height, then recipient can restore relatively more bit or symbol.Therefore, high FEC redundancy ranks are logical Often use in the following cases：Transmission channel has the quality of difference, it means that being sent to the data of recipient may meet with It is lost by relatively more bit or symbol.

FEC redundancy ranks are higher, and transmission data needs more resources.In general, FEC is added to data to be sent Data or information.The data side of being received of addition is used to restore the bit or symbol of any loss.FEC redundancy ranks are higher, More data are added to data to be sent.And it is therefore not desirable to using too high FEC redundancy ranks, this is because this Additional resource will be spent to transmit data to recipient.FEC redundancies ranks is usually expressed with percentage, such as 10%, 20% or 35%.How many additional information be added to for data to be sent for percentage expression.If BM-SC plans 1 megabytes of data is delivered, and using 10% FEC redundancy ranks, then this means that BM-SC needs to deliver to end user 1.1 Mbytes.FEC redundancy ranks are regarded as the largest percentage packet loss that BM-SC can be handled, and therefore, If finding that the packet loss of data session is more than FEC redundancy ranks at UE, in addition to fec, it is also necessary to take hand Section is to cope with this packet loss rank.

This method further includes sending to use the data file of identified FEC redundancies rank and right at least one UE The instruction of identified FEC redundancies rank.BM-SC sends the instruction to identified FEC redundancies rank to UE.This meaning Taste, and recipient UE had not only received the data file for including FEC redundancy ranks, but also received the instruction to the FEC redundancy ranks. This enables (one or more) UE respectively to determine grouping or symbol Loss Rate in the early stage of the broadcasting process.Then UE The present case about grouping or symbol Loss Rate can be notified to BM-SC, this will be described in greater detail below.

Here is the FDT frameworks update in proposed 3GPP TS 26.346, wherein defined new attribute is (here Referred to as FEC-OTI- redundancies rank), wherein OTI is the abbreviation of Object Transmission Information.FEC redundancy ranks indicate or information can It is included in FDT examples rank or file attribute rank.May include the attribute if FEC codings are activated, the wherein category The value of property to indicate FEC caused by the percentage of expense provide.It is superfluous that FEC-OTI- redundancies rank can be alternatively referred to as FEC Remaining rank or FEC expenses.

If (from there backward, UE is known that the FEC-OTI redundancies rank of the data file object of arrival from the beginning Referred to as FEC redundancies rank), then in the case that UE experienced packet loss during the transmission of data file (and more Body, iing has been found that percentage of packet loss has been more than the time point of FEC redundancy ranks) UE will take it is different and Preferably action, alternatively, in other words, with the situation that keeps receiving the irreclaimable groupings of UE on the contrary, UE can therefore from this when Between point start to abandon and belong to the packet of corresponding document object.It not continuing to be grouped by selection, UE cannot be continued with, And as a result, it will be handled in early stage stopping, this will save battery, and can also obtain preferably user friendly Property.

Fig. 3 is the file delivery illustrated comprising is more than 20% FEC redundancy ranks, does not surpass that is, UE will be handled 20% packet loss rate is crossed, however in the case where packet loss rate is more than 20%, initiation is acted, what is be such as proposed above is dynamic One of make.

More specifically, if it find that packet loss is more than FEC redundancy ranks, then UE can abandon session, i.e. data text The broadcast of part is transmitted；Or UE can report packet loss rate to BM-SC before the broadcast transmission session terminates.

From the perspective of operator or BM-SC, if as suggested above, UE reports potential text in early stage Part reparation requirement, then can take different actions at BM-SC, and to be repaired before fall-back mode is opened in file, prevent can quilt Referred to as business mighty torrent or in other words with network over loading come the situation expressed.

If MBMS download sessions support the file reparation for on-demand content delivery, operator will be by following Mode controls the function of BM-SC.From the perspective of operator, BM-SC becomes before actual file repair procedures start Understand potential file repair request quantity, different actions can be taken at BM-SC after this.One this action can be with It is to extend to repair window；Another action can be by announcing another empty joint delivery process (ADP) or update scheduling Segment cancels ADPD processes to indicate that BM-SC will force UE to be repaired before window starts in file, is repaiied to cancel P2P data files It is multiple.If there is many UE could not restore data file object, then BM-SC can be that the download session dispatches another broadcast clothes Business.This can be using Fig. 4 come illustrations.Since UE has just known FEC redundancy ranks, and energy at the beginning of reception It is enough to determine that it is simultaneously compared by packet loss rate with FEC redundancy ranks in statistical significance, so it can be by BM- SC notices (once terminating i.e. for the broadcast session that data file is downloaded) UE after FDT examples expire will need file to repair Multiple processing, to make a response to the packet loss rate more than FEC redundancies rank 20%.

All client request information can be collected, to check that how many user (i.e. the number of UE) needs for The file reparation of the download session of progress.Depending on the statistics before reaching file and repairing window, can be taken not at BM-SC Same action：

1) if the quantity of file repair request will not flood network, but find that predefined reparation window is too short, then ADPD xml can be updated and be sent in a manner of (unicast or broadcast) in band or out of band, and window is repaired to extend file.

It, can be by with interior hair if 2) quantity of file repair request may flood network and file repair server Updated user service description (USD) segment is sent to cancel file repair procedures or session.If desired, can dispatch another Time slot retransmits data file to retransmit data file, or another broadcast session of scheduling in identical broadcast session, without It is to use file repair mechanism.

If above-described BC-SC and method wherein and above-described UE and method wherein can have Dry advantage.One advantage is：Make it possible to deliver FEC redundancy class informations to UE, be come from so that UE can determine How much groupings in the data file of BM-SC are successfully received and how many grouping is not successfully received, and can be assessed The result is to take action appropriate.As a result, once finding that packet loss has been more than FEC redundancies rank and in FDT examples Before expiring, UE can trigger action early.

(a) for demblee form (dash) steaming transfer, if FEC redundancies class information is by including UE can be made in The packet loss of segment loses the quick decision of the whole fragment in the case of alreading exceed FEC redundancy ranks, so that UE can take action early in the case where the segment can not be restored.Otherwise, UE must wait reach FDT examples expire when Between, it can take any action.

(b) for on-demand content, when the packet loss rate of UE is more than FEC redundancy ranks, it is meant that UE needs are held Row file repair procedures or session.The forward direction BM-SC that window starts can be repaired in file notify upcoming file reparation. BM-SC can be prevented from repairing storm by any one of following manner using the statistical data to determine how：Pass through extension File is repaired the phase, or by cancelling file repair procedures or session.This is highly useful, and it is especially prevented for big File transmits the potential network unicast storm overload of (such as due to the newer deliverings of Android).

Fig. 5 and Fig. 6 a-6d are in BM-SC by applying broadcast session come at least one into radio circuit The exemplary flow chart of the method for the data of a UE transmission datas file.

In this example, in Fig. 5 can be executed at BM-SC for by broadcast session come into radio circuit The method of at least one UE transmission datas file include：The data text that determination will be sent at least one UE in step 510 Part.The decision can be to be sent to multiple from the data file of network node and the data file because of for example receiving The instruction of UE triggers, wherein multiple UE is also referred to as MBMS clients.

Once BM-SC has been determined by broadcast mode transmission data file, BM-SC has been determined that will be in transmission data text The FEC redundancy ranks used when part, as shown in another step 520.FEC the recipient of data to correct to connect Any possible mistake in the data received.In general, when by air transmission data, the quality of transmission channel may Difference is very big, and the channel quality of difference may result in and lose several data blocks (multiple bits or symbol).By using FEC adds additional bit or symbol from sender's entity to the data to be sent.The symbol added is chosen to count According to recipient will restore the data bit lost in the transmission or data symbol using the bit of the addition or symbol.

This method further includes：The data file using identified FEC redundancies rank is sent at least one UE With the instruction to identified FEC redundancies rank, as shown in another step 530.

According to an alternative embodiment, the above method can also include：With identified FEC redundancies grade renewal (text Part delivers table) FDT examples, as shown in optional step 525, wherein the newer FEC redundancies rank is sent in FDT examples To UE.

Start to when the transmission of UE or eMBMS clients or broadcast data packets in BM-SC, BM-SC is sent out comprising necessary letter The user service of breath describes.During broadcast session, BM-SC is also sent out for describing delivering or broadcast file object FDT examples.UE or eMBMS clients can decode the packet received using FDT examples and restore file object. By with identified FEC redundancies grade renewal FDT examples, BM-SC the information to be issued to reception to be broadcasted Data file UE.

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

FLUTE FDT examples describe the file object of delivering or broadcast, and are also provided to UE about data file point The information cut.In general, data file may be very big, and grouping or symbol must be divided into.In this example, The grouping of each of data file to be sent is associated with FDT examples.

Optionally, the method for Fig. 5 can also include another optional step 540, at least one from least one UE A UE is received to BM-SC and is indicated that this can not be successfully decoded in UE when applying the FEC redundancy ranks for sending the data file The information of data file, the information also indicate packet loss rate.

According to one embodiment, being received from least one of at least one UE UE can not be to BM-SC instructions UE The information that work(decodes the data file includes：Receive the reception report request that packet loss rate is indicated to BM-SC.

In this way, existing message, which be used to fail about UE to BM-SC reception and registration, receives the decode broadcast The information of grouping, and convey the information about packet loss rate.

UE decodes the FLUTE objects packet/symbol received using FDT examples and restores file object.UE is utilized Including FEC redundancies rank the grouping received or symbol are decoded.As will be explained below, UE can not be at In the case of work(decoding grouping, UE fails to BM-SC notices and decodes the grouping of broadcast.UE also to BM-SC instruction grouping/ Symbol Loss Rate.

If receiving at BM-SC the information that instruction fails decoding data file according to step 540, BM-SC can be with Continue this method with numerous alternate ways, this can depend on present case and/or selected configuration, will scheme now It is described in 6a-6d.

According to one embodiment, as shown in another step as the step 610 in Fig. 6 a, BM-SC, which is determined, increases FEC Redundancy rank, and continue to UE send using increased FEC redundancies rank data file it is follow-up be grouped and it is right Hereafter the instruction of increased FEC redundancies rank is used.

Due to BM-SC is received can not be to BM-SC instructions UE from least one of at least one UE UE Work(decodes the information of the data file, so BM-SC knows that FEC redundancies rank is too low so that the broadcast that UE can not be successfully decoded Data file grouping.This may be since channel quality is too poor so that the grouping of broadcast becomes some damages or damages To a certain degree so that UE can not possibly correct the mistake in grouping using current FEC redundancies rank.

BM-SC in the example, which is determined, increases FEC redundancy ranks, thus with lower or current FEC redundancies are used Degree rank is compared, and UE can correct more mistakes in the grouping of broadcast and reception.This is possible to overcome the grouping of broadcast for example It is damaged to the shortcomings that can not restoring due to the channel quality of difference, this is because FEC redundancy ranks are higher, recipient can The mistake of correction is more.

Because having changed (being to increase in this example) FEC redundancy ranks now, hereafter BM-SC must be indicated to UE Use the increased FEC redundancies rank.This can be completed by updating FDT examples again based on current FEC redundancies.

In this way, since BM-SC sends out the FDT realities for describing delivering or broadcast file object or grouping Example, all UE for receiving broadcast know the new increased redundancy rank.Then UE can be connect using FDT examples to decode The FLUTE objects that receive and restore this document object.By with increased FEC redundancies grade renewal FDT examples, BM-SC This information can be sent out to the UE for receiving broadcasted data file.As a result, FEC redundancies rank during broadcast session not It must be constant or static, but can be dynamic, to meet the condition of possible variation, to obtain the broadcast session phase Between REC redundancies change.

According to another embodiment, BM-SC is changed to the step in application drawing 6b, i.e. BM-SC, which is determined, to be stopped to described at least one The transmission of the data file of a UE, and sent at least one UE about the information for having stopped data transmission, such as walk Shown in rapid 615, and data transmission is rescheduled to later point, as shown in another step 620.

The data can be sent and be rescheduled to later point by BM-SC.Because in radio or wireless communication system Channel quality in system has sizable variation such as the time, so BM-SC assume that UE reports fail decoding institute extensively The reason of grouping broadcast is since temporary channel quality deteriorates.Therefore, in later point, channel quality may change It is kind, therefore data transmission is rescheduled to later point by BM-SC.

BM-SC can receive fairly large number of can not be successfully decoded to BM-SC notices UE from different UE and come from The instruction of the broadcast packe of BM-SC.In this example, BM-SC can determine the data file stopped at least one UE Transmission.This is for the alternative for increasing FEC redundancy ranks.

Once BM-SC determines the transmission stopped to the data file of at least one UE, BM-SC is to described at least one A UE notices stop the data and send.In this way, UE can become to know they should not or need not be intercepted will be by wide Broadcast more groupings of session reception.UE can then take action appropriate, such as simply discard the number received so far The data file is sent according to all groupings of file, or request.

On how to select the rule of correct alternative that can be pre-defined by operator.For example, if being directed to one There are 1000 potential file repair requests, then operator can extend file reparation window for a session, if there is 10000 Potential file repair request, then operator can select cancel for the delivery session file reparation.

According to yet another embodiment, BM-SC is readily modified as shown in fig. 6 c, determines that extension file repairs window, and will The file of extension repairs window and is applied to that any file sent after terminating in ongoing data file is followed to repair session.This Shown in step 625 in kind alternative such as Fig. 6 c.

BM-SC receive the instruction from multiple UE fail decoding the data file broadcast grouping instruction.Make For the another replacement of the transmission of the FEC redundancies rank or suspension data file of increase data file, BM-SC can determine extension The file after the data transfer termination at least one UE is followed to repair window.It means that UE can be than being used for text The default time of part repair process uses file repair procedures during the longer time.BM-SC can be considered will demand file The number of the UE of reparation, because this is known according to the instruction of the grouping of the decoding broadcast that fails received.If The number (quantity for needing the UE of file repair procedures) that each file repairs session will not make network over loading, and if Current file reparation window is too short without allowing all UE to execute file reparations, then BM-SC can update ADPD xml to extend text Part repairs window.When BM-SC updates ADPD xml, the updated ADPD xml of BM-SC unicast or broadcasts, to extend file Repair window.

According to another embodiment, as shown in the step 630 in Fig. 6 d, BM-SC be readily modified as determine cancel should follow to The data of at least one UE send the file after terminating and repair window.

BM-SC may receive the finger of the grouping of the decoding broadcast that shows to fail from UE of relatively large amount Show.In the case where there is a large amount of this instruction, BM-SC assume that file repair procedures may make network over loading.For Any overload condition, BM-SC is avoided to be changed to determine that cancelling file repairs window.This, which may result in several UE, to succeed Receive complete data file.

Operator can cancel file reparation by sending updated user service segment via service discovery channel Window.

According to yet another embodiment, BM-SC is readily modified as shown in the step 630 in Fig. 6 e, is preserved about it is reported that not The number of the UE of the data file can be successfully decoded and be intended to receive the grouping of the UE at least one UE of the data file The information of percentage is lost, and after sending termination to the data of at least one UE, based on the information preserved, weight Pass the reparation symbol of particular percentile.It is alternatively possible to retransmit this document using another time slot in broadcast session.

In this example, BM-SC can also cancel file reparation window, and be changed to：In the number at least one UE The reparation symbol for retransmitting particular percentile later is terminated according to sending, or this article is retransmitted using another time slot in broadcast session Part.In this way, it avoids since file repair request and file repair the risk that session causes network over loading.In addition, such as Fruit is retransmitting another time slot in repairing symbol or using broadcast session after being terminated to the transmission of the data of at least one UE UE can be enable to restore data file in the case where not utilizing file repair procedures to retransmit this document, then can saved Resource.

EMBMS download sessions support the file reparation for on-demand content delivering.If operator or BM-SC can be in realities The file reparation on border knows potential file repair request quantity before starting, then operator or BM-SC can take different Action, for example, it is any one of following：Extend and repairs window；Or by announce another empty joint delivery process (ADP) or Update schedule fragment is cancelled with indicating that operator or BM-SC wish that UE or eMBMS clients are repaired in file before window starts ADPD processes, to cancel point-to-point (P2P) data file reparation.Fail recovery data file object most if there is too many Whole user, then operator or BM-SC can be that the download session dispatches another broadcast service.

Fig. 7 a and 7b are the broadcast sessions that can receive the transmission data file from BM-SC for showing to execute at UE Method exemplary flow chart.

According to the one embodiment described with reference to figure 7a, as indicated by step 710, UE is receiving the transmission from BM-SC, The transmission includes data file and the instruction to the FEC redundancy ranks for transmission data, and wherein FEC redundancies rank is led Cause adds expense in being received data；And as shown in step 720, using indicated FEC redundancies rank to receiving To transmission be decoded.

It includes data file and the instruction to the FEC redundancy ranks for sending the data that UE, which is received from BM-SC, Transmission.This means that UE had both received the broadcast transmission of the data file carried out in the form of an at least packet.UE is also Receive the instruction to the FEC redundancy ranks for transmission data.Then, UE can use the FEC redundancy ranks, to become The grouping or data file that work(decoding receives.If the grouping or data file that receive include lower than FEC redundancy ranks Error rate, then UE can correct the mistake in grouping or data file, the grouping or data file is successfully decoded.

Method in the UE can have the advantages that several.One advantage is：FEC redundancy class informations are delivered to UE, And make UE can determine how much groupings in the data file from BM-SC be successfully received and how many grouping not by It is properly received.Once packet loss be more than FEC redundancies rank and FDT examples expire before, UE can be triggered early Action.(a) for demblee form (dash) steaming transfer, if FEC redundancies class information is by including UE can be made in segment Packet loss already exceed FEC redundancy ranks in the case of lose the quick decision of the whole fragment.UE is existed The segment takes action early in the case of can not restoring.Otherwise, UE, which must be waited, reaches FDT example time expirations, can It takes any action.(b) for on-demand content, when the packet loss rate of UE is more than FEC redundancy ranks, it is meant that UE is needed Execute file repair procedures or session.UE can repair the forward direction BM-SC that window starts in file and notify upcoming file It repairs.BM-SC (can repair the phase or by cancelling file reparation to determine how using the statistical data by extending file Process or session) it prevents from repairing storm.This is highly useful, and it is particularly useful to operator or BM-SC and prevents from being directed to The potential network unicast storm overload of big file delivery (such as Android updates).

According to embodiment, data file is associated with FDT examples, and wherein the data file is divided into grouping, Mei Gefen Group is associated with FDT examples, and wherein FDT examples include FEC redundancy class informations.

Before BM-SC starts to send or broadcast FLUTE groupings to UE or eMBMS clients, BM-SC is sent out comprising necessity The user service of information describes.During broadcast session, BM-SC also sends out the file object for describing to deliver or broadcast FDT examples.UE or eMBMS clients can be grouped decoding the FLUTE objects received using FDT examples and restore file Object.By the way that with identified FEC redundancies grade renewal FDT examples, BM-SC enables the information to be issued to reception The UE for the data file broadcasted.

Once FEC redundancy ranks have been received in UE, which can be used for determining whether decoding succeeds, such as step Shown in 730.As already described above, UE decodes the grouping received or data file using the FEC redundancies rank.

If being determined that the decoding of the transmission to receiving is unsuccessful in step 730, instruction UE is sent to BM-SC The data file or the information of grouping can not be successfully decoded, as indicated by step 740.Transmitted information may include receiving report Request indicates packet loss rate to BM-SC.In addition, UE can also make a response to the given scenario by following manner：To Request and the file of BM-SC are repaired session by BM-SC instructions after broadcast session termination, to receive to warp-wise BM-SC The re-transmission of those of the failed decoding indicated grouping.This is shown in optional step 750.

In this way, BM-SC knows that demand file is repaired session or process by UE after broadcast session termination.This BM-SC is enable to take action appropriate.As described above, if receive broadcast data file UE in relatively more UE Show that they repair demand file, then BM-SC can be determined：Such as increasing FEC ranks, extension file repairs window, Huo Zhequ The file that disappears repairs window.

In this way, existing message, which be used to fail about UE to BM-SC reception and registration, receives the decode broadcast The information of grouping, and convey the information about packet loss rate.

If receiving more data, this method can continue as shown in the branch C in Fig. 7 a and 7b, so And if being not received by more data, this method continues as shown in the branch B in Fig. 7 a and 7b, such as step 760 Shown in, and be further described below.

Other than method as described above step, UE can be executed another based on the understanding to dynamic FEC redundancy ranks Outer step is described referring now to Fig. 7 b.According to the step 770 of Fig. 7 b, UE determines the grouping being not yet successfully decoded Ratio between number and the number of the grouping received, and determine FEC redundancies rank with institute really in subsequent step 780 Relationship between fixed ratio.UE receives multiple groupings, i.e., all portions for the same data file broadcasted from BM-SC to UE Point.Some groupings may be successfully decoded, and some groupings may decode not successfully.UE determines packet loss rate, with percentage Than indicating and being the failed number of decoded grouping divided by the sum of the grouping received.

If determining that the ratio is higher than FEC redundancy ranks, i.e., the phase of failed decoded grouping in next step 790 The quantity that can be handled by application FEC is more than to quantity, and is not therefore directed to delivered data file and enables file It repairs, UE can be inferred that it will not be able to be properly received and decode the data file.If it is the case, then UE holdings connect The more groupings for receiving the data file will be waste of resource.Therefore, as shown in step 800, UE, which will then be determined, to be stopped or terminates The reception of other groupings of the ongoing same data file in the broadcast session, unless file reparation is activated.Text Part repair process is just enabled only for the on-demand content delivering via broadcast.However, as already explained above, BM-SC has Following options：Cancel file and repair window, to disable file repair procedures.

Referring now to Fig. 8 be described in further detail suitable for via broadcast session into radio communications system at least one The BM-SC of a UE transmission datas, wherein BM-SC 800 includes processor 810 and can store the calculating of computer-readable instruction Machine readable memory 820, the computer-readable instruction make processor 810 when being executed by the processor：To it is described extremely Few 1000 transmission data of UE, and determine FEC redundancy ranks, the FEC redundancies rank and transmission data are in association It sends.In addition, computer-readable instruction will also be able to so that processor 810 is executed above with reference to arbitrary in Fig. 5 or Fig. 6 a-6e Arbitrary steps in the alternative approach step of attached drawing suggestion.

More specifically, executable instruction is configured such that they make processor 810 upon being performed：It determines to exist and want The data file sent at least one UE；It determines FEC redundancy ranks, indicates to be applied in data to be sent FEC amount of redundancy；And the instruction via transmission unit 830 to one or more UE transmission datas and to FEC redundancy ranks.

In addition, executable instruction can make processor 810：It is newer by being inserted into the instruction of FEC redundancy ranks Newer FDT examples are sent to one by FDT examples via transmission unit 830 after this as FEC redundancy level attributes A or multiple UE.

In addition, executable instruction can make processor 810：With numerous alternate ways to via receiving unit 840 to The information that the instruction that a few UE is received can not decode the data received responds.

According to first embodiment, executable instruction makes processor 810：Increase FEC redundancy ranks, to send table to UE It is bright hereafter to use the instruction of increased FEC redundancies rank, and be continuing with the increased FEC redundancies rank and send the number According to the follow-up grouping of file.

According to second embodiment, executable instruction is changed to so that processor 810：Stop the number at least one UE 1000 It is sent according to file；And it is sent at least one UE 900 about the information for having stopped data transmission.

According to third embodiment, executable instruction is changed to so that processor 810：It extends file and repairs window, and will be after extension File repair window be applied to follow ongoing data file send terminate after arbitrary file repair session.

According to fourth embodiment, executable instruction makes processor 810：Cancellation should be followed at least one UE 1000 Data send terminate after file repair window.

According to the 5th embodiment, executable instruction makes processor 810：It preserves about it is reported that the decoding that fails should The number of the UE of data file and the packet loss percentage for being intended to receive UE at least one UE of the data file Information, and after sending termination to the data of at least one UE, based on the information preserved, retransmit particular percentile Reparation symbol.It is alternatively possible to retransmit this document using another time slot in broadcast session.

Alternatively, computer-readable memory 820 can be arranged to computer program product 820a comprising computer can Medium and computer program 850 are read, computer program 850 includes executable instruction as described above.The computer program product 820a can be non-volatile or volatile memory form, and such as electrically erasable programmable read-only memory (EEPROM) dodges It deposits, random access memory (RAM) or disk drive, but is not the form of signal or any type of electromagnetic wave.The computer Program product 820a can also include long-time memory 860, such as can be the single memory or group in following memories It closes：The memory of magnetic memory, optical memory, solid-state memory or even Remote Installation.

It just combines shown in Fig. 9, alternative BM-SC 900 may include processing unit 910, memory 920, transmission unit 930 and receiving unit 940, it is operatively connected for the corresponding function of the arrangement for being able to carry out with being described above with reference to Fig. 8. The processing unit 910 of Fig. 9 may include the suitable number of module being operatively connected or unit, such as：Receiving module 911, is used for Data are received from UE；Determining module 912 is used to determine when modification FEC redundancy ranks；Sending module 913, for being sent out to UE Send data；Update module 914, for updating accordingly FEC redundancy ranks；And scheduler module 915, it will arrive for dispatching Flow, may be influenced by newer FEC redundancies rank.

Moreover, the UE for any method being able to carry out in the above method needs to carry out corresponding adaptation.According to one A embodiment is suitable for receiving the UE of the broadcast session of transmission data from BM-SC 800 above-mentioned with reference to the description of figure 10.UE 1000 include processor 1010 and memory 1020, memory 1020 can store instruction, described instruction is by processor 1010 Make processor 1010 when execution：The transmission from BM-SC 800 is received, which includes data file and to being used to send number According to FEC redundancy ranks instruction；And the transmission received is decoded using indicated FEC redundancies rank.

In another example, data file is associated with file delivery table (FDT) example, wherein data file is divided At grouping, each grouping is associated with FDT examples, and wherein FDT examples include FEC redundancy class informations.

In another example, memory 1020 can also store such instruction, and described instruction is held by processor 1010 Make processor 1010 when row：The grouping received or data file are decoded according to the FEC redundancies rank received, Wherein, if the decoding of the transmission to receiving is unsuccessful, processor 1010 is further adapted for sending instruction UE to BM-SC 800 1000 can not be successfully decoded the data file or the information of grouping.

According to embodiment, the letter of the data file or grouping can not be successfully decoded by sending instruction UE 1000 to BM-SC 800 Breath includes：The reception report request of instruction packet loss rate is sent to BM-SC 800.

In another example, memory 1020 can also store such instruction, and described instruction is held by processor 1010 Make processor 1010 when row：Receive multiple groupings；Determine the number of the number and the grouping received of failed decoded grouping Ratio between mesh；Determine the relationship between the redundancy rank and identified ratio of FEC codings；And the if ratio Rate is higher than FEC redundancy ranks, then processor 1010 is suitable for, in the feelings for the data file not enabled file reparation delivered Stop the reception of other groupings to the same data file in the broadcast session under condition.

In another example, memory 1020 can also store such instruction, and described instruction is held by processor 1010 Make processor 1010 when row：To the instructions of BM-SC 800 by the file reparation of request and BM-SC after broadcast session termination Session, to receive the re-transmission to those of the failed decodings indicated of warp-wise BM-SC grouping.

Alternatively, computer-readable memory 1020 can be arranged to computer program product 1020a, computer program production Product 1020a includes computer-readable medium and computer program 1000, and computer program 1000 includes such as above-mentioned executable finger It enables.Computer program product 1020a can be non-volatile or volatile memory form, only such as electrically erasable Memory (EEPROM), flash memory, random access memory (RAM) or disk drive are read, but is not the form of signal or any shape The electromagnetic wave of formula.Computer program product 1020a can also include long-time memory 1060, such as can be following deposit Single memory in reservoir or combination：Magnetic memory, optical memory, solid-state memory or even Remote Installation are deposited Reservoir.

As in conjunction with shown in Figure 11, alternatively, including processing unit 1110, memory 1120,1130 and of transmission unit The UE 1100 of receiving unit 1140 can be operably connected, to execute work(corresponding with the arrangement described above with reference to Figure 10 Energy.The processing unit 1110 of Figure 11 may include the suitable number of module being operatively connected or unit, such as：Receiving module 1111, for receiving data from BM-SC 900；Decoder module 1112, for being carried out to the data received from BM-SC 900 Decoding, and for determining decoding quality；Sending module 1113 is used for 900 transmission datas of BM-SC；And determining module 1114, for executing any one in above-mentioned determination step based on the configuration of UE 1100.

Although describing embodiment according to several embodiments, it should be anticipated that reading specification and studying After attached drawing, the alternative of them, modification, displacement and equally it will be apparent.Therefore, it is intended that the attached claims School bag include within the scope of falling into embodiment and claims co-pending these substitute, modification, displacement and equivalent.

Claims (32)

1. a kind of method executed in BM-SC of the heart in a broadcast multicast service, the method is used in broadcast session to wireless At least one of electrical communication system user equipment (UE) transmission data, the method includes：

Determine (510) at least one UE transmission datas；

Determine (520) forward error correction FEC redundancy ranks, the FEC redundancies rank instruction is to be applied to be sent out in the data The FEC amount of redundancy sent；And

(530) described data and the identified instruction to the FEC redundancies rank are sent to the UE.

2. the method according to claim 1, wherein the instruction to the FEC redundancies rank is inserted into newer file Table FDT examples are delivered, as FEC redundancy level attributes, the newer FDT examples give institute by transmission (530) after this State UE.

3. the method according to claim 1 further includes step：

The information of (540) from least one of at least one UE UE is received, described information indicates the UE roots to BM-SC Transmitted data can not be successfully decoded according to the FEC redundancies rank applied.

4. method according to claim 3, wherein the receiving step includes：Receive the instruction to packet loss rate.

Further include step 5. according to the method for any one of claim 1,2 or 3：By following manner to from the UE At least one UE receive and responded about the information that can not decode the data：

Determine the FEC redundancy ranks that (610) increase is sent for follow-up data；And

The instruction to newer FEC redundancies rank is sent to the UE.

6. according to the method for any one of claim 1-4, including：

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

The information about the suspension is sent to corresponding each UE.

7. method according to claim 6 further includes step：

The transmission of data to being stopped is rescheduled into (620) and arrives later point.

8. according to the method for any one of claim 1-4, including：

Determine that the file that (625) extension is applied during the data are sent repairs window；And

The file of extension is repaired window to send applied to follow-up data.

9. according to the method for any one of claim 1-4, including：

Cancel the file applied during the data are sent and repairs window.

10. according to the method for any one of claim 1-4, including：

(630) are preserved about the number for the UE for reporting the decoding data that fails and are intended to receive described in transmitted data The information of the packet loss percentage of at least one of at least one UE UE；And

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

Data are retransmitted using another time slot.

11. a kind of method executed in user equipment (UE), the method is sent out for receiving from broadcast/multicast service center BM-SC Data in the broadcast session sent, the method includes：

The FEC redundancy ranks for receiving the data transmitted by (710) from the BM-SC and being applied when sending the data；With And

Received FEC redundancies rank is used to be decoded (720) received data.

12. method according to claim 11, wherein to the instruction of the FEC redundancies rank in file delivery table FDT examples Middle offer.

13. method according to claim 11 further includes step：

Determine whether (730) can be successfully decoded transmitted data；And

It is considered unsuccessful in the decoding, transmitted number can not be decoded by sending (740) instruction to the BM-SC According to information.

14. method according to claim 13, wherein the transmission (740) includes：Indicate the packet loss rate of the transmission.

Further include step 15. according to the method for any one of claim 11-14：

Between the number and the number for the grouping being successfully decoded that determine the failed decoded grouping in the data transmitted by (770) Ratio；

Determine the relationship between (780) described FEC redundancies rank and identified ratio；And

If the ratio is higher than the FEC redundancies rank and is directed to transmitted data not enabled file reparation, in The only reception of (800) to any other grouping of transmitted data.

Further include step 16. according to the method for any one of claim 11-14：

Demand file is repaired after the suspension for the broadcast session initiated to BM-SC instructions (750), to be asked Failed decoded data are received in the file repair procedures asked.

17. a kind of broadcast/multicast service center BM-SC (800), for via broadcast session into radio communications system extremely Few UE (1000) transmission data, the BM-SC (800) include processor (810) and computer-readable memory (820), The computer-readable memory (820) can store instruction, described instruction makes institute when being executed by the processor (810) State processor (810)：

It determines at least one UE (1000) transmission data；

Determination will be used for the FEC redundancy ranks of the transmission；And

It is superfluous to the data of FEC redundancy ranks determined by least one UE sending applications and to identified FEC The instruction of remaining rank.

18. BM-SC (800) according to claim 17, wherein the processor (810) is further adapted for identified FEC redundancies Rank is spent to update file delivery table FDT examples.

19. BM-SC (800) according to claim 18, wherein the memory (820) can also store instruction, described instruction Make the processor (810) when being executed by the processor (810)：From at least one of at least one UE UE (1000) information is received, described information is to the BM-SC (800) instructions at least one UE (1000) according to applied to transmission The data file can not be successfully decoded in the FEC redundancies rank of the data file, and described information also indicates packet loss rate.

20. BM-SC (800) according to claim 19, wherein being connect from least one of described at least one UE UE (1000) It receives to the BM-SC (800) and indicates that the information that the data file can not be successfully decoded at least one UE (1000) includes： Receive the reception report request that packet loss rate is indicated to the BM-SC (800).

21. according to the method for any one of claim 18-20, wherein the memory (820) can also store instruction, institute It states instruction and makes the processor (810) when being executed by the processor (810)：It determines and increases FEC redundancy ranks；With And continue to send the follow-up of the data file for using increased FEC redundancies rank at least one UE (1000) Grouping and to hereafter will application the increased FEC redundancies rank instruction.

22. according to the method for any one of claim 18-20, wherein the memory (820) can also store instruction, institute It states instruction and makes the processor (810) when being executed by the processor (810)：It determines and stops at least one UE (1000) data file is sent；And it is sent at least one UE (1000) suspended about data transmission Information.

23. BM-SC (800) according to claim 22, wherein the memory (820) can also store instruction, described instruction Make the processor (810) when being executed by the processor (810)：By the data send be rescheduled to later when Between point.

24. according to the BM-SC (800) of any one of claim 18-20, wherein the memory (820) can also store Instruction, described instruction make the processor (810) when being executed by the processor (810)：Determine that extension is followed to described The data of at least one UE (1000) send the file after terminating and repair window；And by the file of extension repair window be applied to File after the transmission of the data file terminates repairs session.

25. according to the BM-SC (800) of any one of claim 18-20, wherein the memory (820) can also store Instruction, described instruction make the processor (810) when being executed by the processor (810)：Determine cancel should follow to The data of at least one UE (1000) send the file after terminating and repair window.

26. according to the BM-SC (800) of any one of claim 19-20, wherein the memory (420) can also store Instruction, described instruction make the processing unit (430) when being executed by the processing unit (430)：It preserves about report not The number of the UE of the data file can be successfully decoded and be intended at least one UE for receiving the data file The information of the packet loss percentage of at least one UE；And after sending termination to the data of at least one UE, base The reparation symbol of particular percentile is retransmitted in the information preserved, or is retransmitted using another time slot in the broadcast session The file.

27. according to the BM-SC (800) of any one of claim 17-20, wherein the BM-SC (800) is broadcast multi-broadcasting clothes Business center BM-SC.

28. a kind of user equipment (UE) (1000) is suitable for receiving the transmission data from broadcast/multicast service center (800) BM-SC The broadcast session of file, the UE (1000) include：Processor (1010) and memory (1050), memory (1050) energy Enough store instructions, described instruction make the processor (1050) when being executed by the processor (1050)：

It receives and sends from the BM-SC (800), the transmission includes the data file and to for sending the data The instruction of FEC redundancy ranks；And

The transmission received is decoded using indicated FEC redundancies rank.

29. UE (1000) according to claim 28, wherein the memory (5020) can also store instruction, described instruction exists Make the processor (1010) when being executed by the processor (1010)：According to the FEC redundancy ranks received to being connect The grouping of receipts or data file are decoded, wherein if the decoding of the transmission to being received is failed, the processor (1010) it is further adapted for sending the letter for indicating that the data file can not be successfully decoded in the UE (1000) to the BM-SC (800) Breath.

30. UE (1000) according to claim 29 indicates that the UE (1000) can not wherein being sent to the BM-SC (800) The information that the data file is successfully decoded includes：The reception report request of instruction packet loss rate is sent to the BM-SC.

31. according to the UE (1000) of any one of claim 28-30, wherein the memory (1050) can also store and refer to It enables, described instruction makes the processor (1010) when being executed by the processor (1010)：Receive multiple groupings；It determines not Ratio between the number for the grouping being successfully decoded and the number of the grouping received；Determine the FEC redundancies rank and institute Relationship between determining ratio；And if the ratio is higher than the FEC redundancies rank and is directed to delivered number According to file not enabled file reparation, then stop the reception of other groupings to the same data file in the broadcast session.

32. according to the UE (1000) of any one of claim 28-30, wherein the memory (1050) can also store and refer to It enables, described instruction makes the processor (1010) when being executed by the processor (1010)：Refer to the BM-SC (800) Showing will ask to repair session with the file of BM-SC (800) after broadcast session termination, to receive to warp-wise BM- SC (800) is designated as the re-transmission of those of decoding grouping not successfully.