CN101895445B - Receiver and control method thereof - Google Patents

Abstract

The invention relates to a method for controlling a receiver (30) which is set to be in a receiving operation modes (2;4) for receiving a right amount of data from a transmitting party in the transmitting process and operates in one or more other operation modes (1-7). The method comprises the following steps: setting (S1) an internal transmission end indicator as an initial value when the transmission starts, then adapting (S2) the internal transmission end indicator in the transmission process, monitoring (S3) the internal transmission end indicator in the transmission process to determine whether transmission end conditions are satisfactory and respond to the determined satisfactory transmission end conditions, and leaving (S4) the receiving operation modes to enter one or more of the other operation modes.

Description

Receiver and receiver control method

The application is dividing an application of the PCT international application that added the China national stage (international filing date being that February 15, international application no in 2005 are that PCT/EP2005/001517, China national application number are 200580048339.8, are entitled as " receiver and receiver control method ").

Technical field

The present invention relates to the method and the receiver itself of receiver control, it is arranged to operate to be used for receiving from the reception operator scheme of an amount of data of the transmission of transmit leg, and is arranged to operate with one or more other operator schemes.

Background technology

When transmit an amount of data from the sending direction receiver, during like file; Be known that the transmission that the control messages from the transmit leg to the receiver is provided; And the transmission of the possible response control messages from the receiver to the transmit leg, so that the process of this quantity data is transmitted in control.Be known that the controlling schemes that receiver is set in the following manner equally: it can multiple modes of operation be operated, and wherein has at least a reception operator scheme of the above-mentioned quantity data be used for receiving transmission.Term " transmission " is used to exist the beginning discerned of transfer of data and the implication that finishes.

In the receiver of being arranged to adopt this reception operator scheme to operate, also there are other operator scheme, for example at least a free time or standby mode usually, when not having the transmission of just carrying out, receiver gets into this pattern.Certainly, can have other operator scheme, for example one or more error repair modes are used for repairing the mistake in receiving the data that operator scheme received.The basic problem of this receiver is to have from a kind of pattern (or state) to another kind of

For finishing signaling from receiving the transformation of operator scheme, be known that the transmission that provides from the transmit leg to the receiver to different mode.In other words, transmit leg sends the notice receiver about transmitting the predetermined message that finishes.For instance, in the communication based on data cell, it is the specific markers or the information element of the final data unit of transmission about given data cell that the final data unit of transmission can comprise the notice receiver.But the transmission that transmits end runs into the problem that this type message possibly lost in transport process, keeps being at receiver receiving operator scheme but not having on the meaning that more multidata will receive, and this causes the undefined behavior on the receiver.

US 2004/0057394 has described and has been used to improve from receiver to the method and apparatus in the feedback of channel information of serving BS.The link quality indicator that receives adopt about the historical information of the designator of previous reception and confirm.

Summary of the invention

The purpose of this invention is to provide control setting becomes to receive improving one's methods and corresponding improved receiver of receiver that operator scheme and one or more other operator schemes operate.

This purpose is through realize with receiver according to the method for the invention.Advantageous embodiments has been described in the dependent claims.

According to the present invention, in receiver, be provided with, adaptive and monitoring internal transmission-over indicator, and if internal transmission-over indicator satisfy and transmit termination condition, then leave and receive operator scheme so that get into one of one or more other operator schemes.

Like this, end that receiver can be confirmed to transmit independently and change that subsequently can implement either operational mode, and irrelevant with concrete signaling from transmit leg.This provides significant advantage: the change of the operator scheme in the receiver takes place with definition and predictable mode, does not perhaps transmit these reliably even without the transmission end from transmit leg and transmits end.

Conspicuous solution to the problem of the unreliable transmission that transmits end is to let receiver confirm to transmit the correct reception of end.If transmit leg does not receive a kind of like this affirmation in preset time, then can repeat to send and transmit end, until receiving affirmation.Through making receiver come to confirm alone to transmit termination condition via the monitoring inner parameter, the present invention is different from this conspicuous solution.Therefore, the control messages of reception from transmit leg not necessarily depended in the change of the operator scheme in the receiver.

Notion of the present invention is applicable to particularly advantageous mode and is configured to receive the receiver that point-to-multipoint transmits, promptly broadcasts or multicast transmits.That is, in the point-to-multipoint environment, often can or not hope that receiver sends the affirmation message be used to confirm transmit the correct reception of end to transmit leg.That is, confirm, then so-called affirmation implosion possibly take place at transmit leg if a large amount of receiver sends this type.Therefore, the present invention provides a kind of mechanism, and this mechanism can be guaranteed the reliable and predictable change of operator scheme, even in the point-to-multipoint receiver.

The utmost point advantageous applications of notion according to the present invention, the present invention can be used for the context of so-called MBMS (multimedia broadcast/multi broadcast service) system, for example general introduction among the 3GPP TS 26.346.

Following description through preferred embodiment will be better understood the present invention, and still, these preferred embodiments are not to limit the scope of the present invention that defines in the accompanying claims.

Description of drawings

Illustrate and describe preferred embodiment, wherein

Fig. 1 explains the flow chart of a basic skills embodiment of the present invention;

Fig. 2 explanation shows the state diagram of the transformation between various operator schemes and the operator scheme; And

Fig. 3 explains an indication device embodiment of the present invention.

Embodiment

Fig. 1 representes flow chart, describes a basic embodiment of method of the present invention.The control method of Fig. 1 is applicable to a kind of receiver, and said receiver is arranged to operate to be used for receiving from the reception operator scheme of an amount of data of the transmission of transmit leg, and is arranged to operate with one or more other operator schemes.In receiving operator scheme, receiver preferably when transmitting beginning internal transmission-over indicator be set to initial value, referring to step S1.Subsequently, at step S2, internal transmission-over indicator is by adaptive.

At step S3, receiver monitoring internal transmission-over indicator is so that determine whether to satisfy the transmission termination condition.Do not transmit termination condition if do not satisfy, then routine is re-circulated to step S2, makes step S2 and S3 in transport process, repeat, and transmits termination condition up to satisfying.

If satisfy the transmission termination condition at step S3, then routine gets into step S4, therein, leaves the reception operator scheme, so that get into one of one or more other operator schemes.

Internal transmission-over indicator is selected through any suitable or desirable mode.For example, internal transmission-over indicator can be the output of timer, perhaps can be the output of data amount counter.Transmit the type that termination condition will depend on employed designator.For example, be timer output if transmit end indicator, then transmitting termination condition can be to arrive certain time value (for example, when timer reaches zero in situation about counting down, when perhaps timer reaches the higher limit of setting in the situation of counts).If transmitting end indicator is the output of data amount counter, then transmitting termination condition can for example be in situation about counting down, to reach given lower limit (for example zero), perhaps in the situation of counts, reaches predetermined upper limit value.

Be also noted that embodiments of the invention can walk abreast or use more than one to transmit end indicator with combining.A parallel instance that uses is to adopt timer and data amount counter, and if one of two designators satisfy the corresponding termination condition that transmits, then leave the reception operator scheme.An instance that is used in combination is, has only two designators to satisfy their transmission termination conditions separately, just leaves the reception operator scheme.In any situation, use timer and data amount counter to increase reliability.

The setting of the initial value of internal transmission-over indicator can be that the mode of the fixed value of storing in the receiver is carried out according to initial value.For example known or estimate that transmit leg sends in the situation of transmission of identical size all the time, this is useful.Another instance that initial value is set to fixed value is from known initial value, carry out the adaptive of internal transmission-over indicator as zero in count.

But according to a preferred embodiment of the present invention, internal transmission-over indicator will depend on the transmission initial information that receiver receives from transmit leg to being provided with of initial value.This transmission initial information generally provides quantity or the information of size and/or duration about transmitting.Preferably, transmit parameter one of them or both of size of quantity of parameter and expression data itself of total transmission time that initial information is the quantity of expression data to be sent.In other words, transmit leg for example can send the estimation of total transmission time to receiver, and/or can send and show the parameter that will send how many data.Receiver is arranged to calculate according to received information the initial value of internal transmission-over indicator.For example, be the output of timer if transmit end indicator, then institute's total transmission time that receives can directly be used as the initial value of the timer that counts down.If the size of data bulk is received as initial information, then receiver is arranged to come value computing time according to this data volume and transfer rate known or estimation, and this, value for example was used as the initial value of the timer that counts down computing time.

Similar with being provided with of internal transmission-over indicator, the adaptive of internal transmission-over indicator also can suitably or as required be selected basically.There is the cross-correlation that is used for that designator is set at first, is used for adaptive designator and is used to select transmit the program of termination condition undoubtedly.But adaptive possibly be the count or the program that counts down basically.

In addition, adaptively for example can carry out, that is, make timer or data amount counter increase progressively or increase progressively a fixed value according to the mode that is completely fixed.Be suitable for this conception of species of the adaptive internal transmission-over indicator of fixed form that wherein transmit leg and the behavior that is connected between the receiver is known to remain unchanged or estimate to remain unchanged or the situation of minimum change only.But, change known the passing in time of communication condition or estimate to pass in time and in the situation about changing, preferably according to the adaptive internal transmission-over indicator of transmission progress msg from transmit leg received.Transmitting progress msg can select according to any suitable perhaps desirable mode, and for example can be the parameter of the size of the parameter of expression residue delivery time and/or the data that transmission is waited until in expression.For instance; If the output of timer is as internal transmission-over indicator; And adaptively mainly count down, make that the initial value that transmits end indicator is to estimate the whole delivery time, then be different from residue that transmit leg shows during the delivery time at the instantaneous value of internal timer; Receiver then can suitably adaptive decrement value, so that make instantaneous timer value consistent with the residue delivery time that is shown.The instantaneous value that should be noted that the timer that counts down needn't equal residue delivery time of being shown, because receiver scalable timer, so that add predetermined personal distance.

Method of the present invention can realize through any suitable or desirable mode.In other words, step can any appropriate combination through hardware, software or hardware and software realize in receiver.Preferably, method of the present invention realizes as the computer program that in the programmable processor that control unit comprised of receiver, loads and move.Like this, the computer program that is designed to carry out method of the present invention also constitutes one embodiment of the present of invention.

The schematic illustration of the receiver that Fig. 3 explanation is provided with according to one embodiment of present invention.Receiver 30 is expressed as and comprises the receiving element 31 that receives signal through antenna 34.Receiving element 31 is connected to control unit 32, control unit 32 reference to storage 33 of having the right again.Receiver can comprise other traditional element, and for example keyboard and display do not illustrate in order to simplify description.Be also noted that,, the invention is not restricted to any specific tranmission techniques, make it also applicable to the receiver of the signal that receives wired connection though the receiver 30 of Fig. 3 is described as the wireless device through antenna receiving signal.In this case, element 34 will be the wired connection device.

According to the embodiment of Fig. 3, control unit 32 comprises: initializer 321 is used for that internal transmission-over indicator is set to initial value when transmitting beginning; Adapter 322 is used in the adaptive internal transmission-over indicator of transport process; Monitor 323 is used for monitoring internal transmission-over indicator at transport process, so that determine whether to satisfy the transmission termination condition; And mode converter 324, be used to respond monitor 323 and confirm satisfied transmission termination condition and leave to receive operator scheme and get into one of one or more other operator schemes.

Element 321-324 can be used as hardware element, software element or hardware and software combination of elements and provides.Preferably, they are presented as the computer code part of the computer program that in the programmable processor that control unit 32 is comprised, moves.

Like this, element 321-324 can realize the described method of Fig. 1.In order to realize the preferred embodiment of the inventive method, initializer 321 preferably is arranged to consider the transmission initial information that receives from transmit leg, and adapter 322 preferably is arranged to consider the transmission progress msg that receives from transmit leg.

The pattern of describing one embodiment of the present of invention referring now to Fig. 2 changes or state change figure.Be noted that description sometimes will be with reference to the instance of MBMS and with reference to RfC 3926 and 3451, but this just is used for showing a kind of advantageous applications of the state change figure of Fig. 2, and is not limited thereto.That is, state change figure shown in Figure 2 is applicable to realizing that following table is shown the context of any common receiver of state or the operator scheme of 1-7.

Reference number 1 relates to free time or standby mode, and wherein, receiver will or be waited for initialization so that receive transmission, and basic initialization takes place.In the instance of MBMS, receiver is initialised, and is tied to one or more particular download channels (ip multicast address/port number and source address).Ip multicast address and MBMS of address/port number sign carry.

Reference number 2 expressions are used to receive the downloading mode of one or more files.State 2 is instances of foregoing reception operator scheme.In the instance of MBMS, state 2 is that MBMS downloads accepting state, and wherein, receiver participates in receiving the MBMS data download.This MBMS data download adopts for example FLUTE (file based on the one-way transmission transmits) agreement of appointment among the RfC 3926 for example to transmit.

Reference number 3 is described point-to-point file repair state, and wherein, file repair data is received through point-to-point connection by receiver.In the instance of MBMS, point-to-point file repair state comprises that the what is called that is used for file repair procedure retreats timer.Retreating timer is a kind of mechanism, and according to this mechanism, receiver does not send the request of reparation to transmit leg immediately, but generates the random back-off time, and after the time is retreated in arrival, just sends the request of reparation.Like this, can avoid following situation: ask if a large amount of receiver sends to repair simultaneously, then point-to-multipoint transmit leg and network overload when transmitting end.

Reference number 4 is described the point-to-multipoint file repair state, and wherein, receiver connects through point-to-multipoint and receives restoration information.In other words, transmit leg sends restoration information through the point-to-multipoint channel, and feasible all receivers through said channel receiving information can receive restoration information.State 4 is another instances of foregoing reception operator scheme.Restoration information can adopt MBMS, DVB (DVB) or other any multicast/broadcast dispensing member to transmit.

Reference number 5 relates to the definite state for the completion of the reception of one or more files of reception in state label 2 of receiver of describing.In the instance of MBMS, this state description MBMS receiver has been confirmed the completion for the reception of a FDT (File Delivery Table) example.Do not receive other data for specific FDT example.Possibly be noted that this state do not describe the success or correct reception of the file that transmits, and just show to accomplish and receive.

Reference number 6 is report condition, wherein, describes this state to transmit leg.For MBMS, in 3GPP TS 26.346, describe and receive report, referring to the 9.4th chapter.With similar in the point-to-point file repair procedure, the report program in the state 6 is retreated timer, is that the random value that receiver is selected begins with setting.When retreating timer and expire, carry out alternately, promptly send report.If carry out point-to-point file repair procedure (state 3) in advance, then retreat timer and needn't be used for state 6.

Reference number 7 relates to the definite uncompleted state for the reception of one or more files of reception in state label 2 of receiver of describing.In the instance of MBMS, this state description MBMS receiver has been confirmed the not completion for the reception of a FDT (File Delivery Table) example.Do not receive other data for specific FDT example.

Several kinds of state-transition shown in describing below between the state.

Reference number 1-2 representes from state 1 to state 2, i.e. transformation from subsequent use to accepting state.In the context of MBMS, this transformation triggers through receiving new FDT example.The FDT example identifies (referring to RfC 2936) through LCT header extension EXT_FDT.

Reference number 2-2 representes from state 2 to state 2 transformation, and promptly system remains on state 2.This shows, will receive other file data.

Reference number 2-3 is the transformation from accepting state to point-to-point file repair state, and it shows no longer expects other file data, because the transmission in the state 2 finishes.But receiver is discerned, and existence should be repaired in reception file one or more mistake and program will be proceeded point-to-point file repair procedure.In the instance of MBMS, the configuration parameter of point-to-point file repair perhaps provides (for example, through the mime type sign, perhaps generally disposing via initial MBMS service describing) as its part as the unique file in the FDT example.

With from state 2 to state 3 transformation similar, reference number 2-4 describes from state 2 to state 4 transformation, and receiver confirm to transmit finish and one or more file in carry out when having the mistake that should repair.In the instance of MBMS, the configuration parameter of point-to-multipoint file repair procedure perhaps provides (for example, through the mime type sign, perhaps generally disposing via initial MBMS service describing) as its part as the unique file in the FDT example.

Possibly be noted that state 2 can comprise is used to judge the decision procedure that which will get into repair state.This decision procedure can be depending on preset configuration, perhaps can be depending on the type and/or the quantity of the mistake that detects.For example, transmit leg can provide the indication that which will get into repair state, and the decision procedure in the receiver then decidable switch to indicated state, if perhaps there is not indication, then judge the default setting that switches to normally point-to-point reparation state.

Reference number 2-5 representes from accepting state 2 to completion status 5 transformation, and it can be carried out when for example state 2 is confirmed not need file repair, and perhaps above-mentioned decision procedure can pass through setting, makes file repair not to take place.In the instance of MBMS, the All Files that receiver maybe be described in can reconstruct FDT makes receiver can confirm to transmit to finish and need not wait for other Incoming file data.On the other hand, file repair can not take place if decision procedure through setting, makes, then change the All Files that 2-5 possibly abandon does not have entirely true reception.

If the transformation from point-to-point file repair procedure to the point-to-multipoint file repair is triggered, reference number 3-4 then takes place.For example, if point-to-point file repair server overload thereby response point are sent the point-to-multipoint configuration messages to dot file reparation request, then this thing happens for possibility.

If receiver has received and repaired or the full information of file that reconstruct receives, proofreaied and correct definite mistake thus, reference number 3-5 and 4-5 then take place.In the instance of MBMS, this means, accomplish the reconstruct of the All Files of describing among the FDT.

Reference number 3-7 and 4-7 are described to the transformation of state 7, and it takes place when file repair procedure can not reconstruct receives file to some extent.

Reference number 3-3 and 4-4 describe receiver respectively and remain on point-to-point or the point-to-multipoint file repair state, because expect other repair data.

If do not expect other repair data, but do not obtain complete reconstruct yet, reference number 4-3 then takes place.In this case, might be configured to switch to the point-to-point file repair procedure in state 3 to the point-to-multipoint file repair procedure, so that obtain to lose repair data thus.

Reference number 5-1 and 7-1 show that state 5 and 7 is arranged to not switch to report, make that system turns back to stand-by state 1 after complete or incomplete reception of file.Maybe be from state 5 and 7 direct transformations owing to there not being configuration report state 6 to cause fully, perhaps through judging in the receiver that the decision procedure that need not send report causes to state 1.The latter possibly be like this, in the situation of statistical report, promptly; Receiver does not respond the reception file and sends report, but only sends report with predetermined space, and perhaps report is only sent (promptly according to one of state 5 and 7; If All Files is successfully received, then send report, still; If a part of file does not successfully receive, then do not send report; Perhaps,, then do not send report, still,, then send report) if a part of file does not successfully receive if All Files is successfully received.

As an alternative, state 5 and 7 can be arranged to switch to all the time report condition 6, and therein, report condition 6 comprises about whether sending the decision procedure of report.

If receiver reports that automatically perhaps decision procedure has been made the judgement of sending report, and reference number 5-6 and 7-6 then take place after being arranged in and receiving file.6-6 describes a kind of situation, and in this case, receiver has problem or attempts being connected to a plurality of Objectives of Report ground when being connected to Objective of Report ground (for example transmit leg).

Reference number 6-1 description shows no longer need carry out the transformation that other operation and system turn back to stand-by state.

Change or state transition diagram for pattern shown in Figure 2, preferably in state 2 and/or state 4, realize notion of the present invention.In other words; Be applied to the present invention in the situation of state 2; Reception operator scheme of the present invention is the file receiving mode that is used to receive one or more files; And other operator scheme comprises one or more error repair modes, for example point-to-point file repair mode 3 and point-to-multipoint file repair pattern 4.After leaving state 2, system also can get into file completion status 5 or unfinished state 7.

When being applied to state 4 to notion of the present invention, receiving operator scheme is to be used for changing the first reparation pattern that receives repair data in point-to-multipoint, and one of other operator scheme is the second reparation pattern that is used for receiving in point-to-point transmission repair data.After leaving state 4, system also can get into file completion status 5 or unfinished state 7.

Like this, notion of the present invention is received specific transmission end applicable to making transformation 2-3,2-4 and 4-3 more reliable and more measurable and disobey to be abutted against.

Describe now and relate to specific embodiment the advantageous applications of MBMS.The basic ideas that are applied to notion of the present invention MBMS are to be tied to the accepting state 2 that is used for file in download to the FDT life-span that is called the FDT expiration time again.The FDT life-span preserves as internal transmission-over indicator in receiver; And when this internal lifetime indicator expires; Receiver (being the MBMS subscriber equipment) will leave accepting state 2, and proceed to the transformation of file repair state 3,4 or get into file and finish receiving state 5 or unfinished state 7.

In the context of MBMS, preferably carry out the inside setting of timer and adaptive that expires according to available expiration time information in the MBMS agreement.This expiration time information then can be used as the transmission initial information and/or is used as the transmission progress msg.On the one hand, available expiration time information possibly be " expiring " attribute (RfC 3926) of FDT example.The attribute that expires is the XML attribute, and FDT divides into groups then also to comprise like the defined transmit leg current time (SCT) among the RfC 3451.According to the difference between SCT and the expiration time, the receiver scalable inside timer that expires.Since the inner timer that expires adaptive depend on the transmit leg current time and show the difference that expires between the attribute, therefore, for point-to-multipoint transmit leg dispensable synchronously with respect to a plurality of receivers.When FDT divided into groups to be interleaved in the MBMS download transmission, the SRT header value must adopt the current time of sending grouping to upgrade.

Available another expiration time information is Estimated Time Remaining (ERT) option like RfC 3451 defined LCT (hierarchical coding transmission) head in the MBMS context.For this reason, preferably, transmit leg is arranged in all FDT divide into groups, comprise Estimated Time Remaining all the time.When FDT divided into groups to be interleaved in the MBMS download transmission, the ERT value can be adjusted to the actual duration that MBMS transmits.

When receiver receives new FDT and divides into groups, it with the FDT grouping in the information that receives compare the expire state of timer of its inside of checking.Then, its timer that can correspondingly adaptive inside expires.

FDT divides into groups can be interleaved in the MBMS data flow, so that increase the reliability that transmits.Therefore, the MBMS receiver can receive some FDT groupings of identical FDT example.Transmit leg preferably is set, makes these FDT groupings all carry suitable expiration time information.Should be noted that the expiration time that transmit leg provides can change according to for example transmission bandwidth variation.

Transmit leg can be confirmed to transmit the duration according to the quantity of data to be sent and the expectation that is used to transmit or known bandwidth.Transmit leg is confirmed the transmission duration of the FDT example of actual FDT structure.Transmit leg consideration file and file attribute are created FDT.If the transmit leg applied compression, then file content is compressed, and in next step, only considers the result of compression.If transmit leg adopts forward error correction (FEC), then FEC is applied to each file, and redundancy is increased.Transmit leg is confirmed the sum of the grouping of FLUTE example.Combine the sum (comprise head and consider possible header decompression will) that divides into groups with the bandwidth that request MBMS carries, transmit leg can be confirmed to carry the time of transmitting all data via MBMS.Transmit leg calculates the life-span (considering the reception of FDT example and the quantity that FDT divides into groups) of FDT example.This result of transmit leg scalable is for example so that contain possibly postponing of a part of FLUTE grouping.

Except receiver expires the ability of timer according to the inside of regulating it from the clear and definite temporal information that transmit leg received, receiver calculates expiration time information from data amount values also be feasible.For example, according to RfC 3926, attribute " content-length " or " transmission length " can send to receiver from transmit leg.In a preferred embodiment, receiver can calculate the whole transmission duration or the residue transmission duration of expectation according to content-length that is shown or the bandwidth of transmitting length, adopting the known of basic MBMS carrying or estimate.

The above description of preferred embodiment only is used to provide more thorough of the present invention, rather than will limit.On the contrary, scope of the present invention is defined by accompanying claims.Reference number is used for increasing legibility, rather than will limit.

Claims (10)

1. method of controlling multi-medium multi-packet broadcasting/multicast services receiver; Said multi-medium multi-packet broadcasting/multicast services receiver is arranged to operate to be used for receiving from the accepting state and the file repair state of an amount of data of the transmission of transmit leg, and said method comprises:

When internal lifetime indicator expires, leave said accepting state and be converted to said file repair state.

2. method according to claim 1 is characterized in that, said internal lifetime indicator depends on available expiration time information in multi-medium multi-packet broadcasting/multicast services agreement.

3. method according to claim 2 is characterized in that, said available expiration time information is the attribute that expires of File Delivery Table example.

4. according to the method described in each in the aforementioned claim, it is characterized in that said file repair state is point-to-point file repair state.

5. method according to claim 4 is characterized in that, said point-to-point file repair state comprises the random back-off time that generates, and retreats the time back of exceeding the time limit at this and send the request of reparation.

6. device of controlling multi-medium multi-packet broadcasting/multicast services receiver; Said multi-medium multi-packet broadcasting/multicast services receiver is arranged to operate to be used for receiving from the accepting state and the file repair state of an amount of data of the transmission of transmit leg, and said device comprises:

The parts that are used for when internal lifetime indicator expires, leaving said accepting state and are converted to said file repair state.

7. device according to claim 6 is characterized in that, said internal lifetime indicator depends on available expiration time information in multi-medium multi-packet broadcasting/multicast services agreement.

8. device according to claim 7 is characterized in that, said available expiration time information is the attribute that expires of File Delivery Table example.

9. according to the device described in each in the claim 6 to 8, it is characterized in that said file repair state is point-to-point file repair state.

10. device according to claim 9 is characterized in that, said point-to-point file repair state comprises the random back-off time that generates, and retreats the time back of exceeding the time limit at this and send the request of reparation.

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