CN1330155C

CN1330155C - Data processing method of protocol data unit in radio chain circuit control disordcred sequence transmission function

Info

Publication number: CN1330155C
Application number: CNB200510097908XA
Authority: CN
Inventors: 郑潇潇; 胡灏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-08-24
Filing date: 2005-08-24
Publication date: 2007-08-01
Anticipated expiration: 2025-08-24
Also published as: CN1794696A; WO2007022728A1

Abstract

The present invention discloses a data processing method for a protocol data unit (PDU) in an orderless transmission function controlled by a radio link, which comprises: when a new PDU is received and cached, whether a PDU connected with the current PDU is cached in a window is checked; if the PDU connected with the current PDU is cached in a window, data is processed according to the existing protocol; if the PDU connected with the current PDU is not cached in a window, data is processed according to strategies established in advance; when a window moves or a counter is overtime, and the PDU in the window is required to be deleted, data of the PDU containing integral SDU is processed according to strategies established in advance. The present invention can avoid the unnecessary loss or duplicate copy of SDU for the operation of single discontinuous PDU in a recombined cache in an orderless transmission function of MCCH.

Description

Radio Link is controlled protocol Data Unit data processing method in the out of order transfer function

Technical field

The present invention relates to mobile network's multimedia multicast broadcasting service (MBMS, MultimediaBroadcast/Multicast Service) the Radio Link control (RLC in, Radio Link Control) out of order transmission (OSD, Out of Sequence Delivery) technology, be meant protocol Data Unit in a kind of RLC osd function (PDU, Packet Data Unit) data processing method especially.

Background technology

Now, people no longer are satisfied with phone and messaging service to the demand of mobile communication, fast development along with the Internet (Internet), a large amount of multimedia services emerge, the some of them applied business requires a plurality of users can receive identical data simultaneously, as video request program, television broadcasting, video conference, online education, interactive game etc.These mobile multi-media services are compared with general data, have characteristics such as data volume is big, longer duration, delay sensitive.Present IP multicasting technology only is applicable to wired IP network, is not suitable for the mobile network, because the mobile network has particular network structure, functional entity and wave point, these are all different with wired IP network.

In order to effectively utilize mobile network resource, Wideband Code Division Multiple Access (WCDMA) (WCDMA)/global system for mobile communications (GSM) global standardsization are organized in the third generation partner plan (3GPP) and have proposed multimedia multicast broadcasting service (MBMS, Multimedia Broadcast/Multicast Service), in the mobile network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.The MBMS of 3GPP definition can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize the multicast and the broadcasting of high-speed multimedia business, and this has complied with the trend of following mobile data development undoubtedly.

Referring to shown in Figure 1, roughly as follows in the 3GPP TS25.322 agreement at present for the process prescription of osd function:

Step 11～13 when receiving a PDU from media access control sublayer, at first judge whether first PDU for receiving, if init state variable V R (UOH) subtracts 1 (SN-1) for the sequence number of this PDU;

Step 14, the PDU that receives generally speaking is not first, judges that then the PDU receive is whether within window;

Step 15～17, if the PDU sequence number of receiving within receive window, i.e. VR (UOH) 〉=SN＞VR (UOH)-OSD_Window_Size, the PDU that then judges whether same sequence number is buffered, if then delete current PDU, otherwise, current PDU buffer memory is got up;

Step 18～23, if the PDU sequence number of receiving is outside window, then the PDU buffer memory is got up, upgrade VR (UOH)=SN, window moves thereupon, deletes the PDU of all sequence numbers outside window, if timer Timer_OSD starts, then stop timer, restart timer, upgrade VR (UDR)=VR (UDH)-DAR_Window_Size+1.

For the PDU that is buffered, consider whether all continuous PDU have the complete Service Data Unit (SDU of " Length Indication " expression, Service Data Unit), if have, these PDU are reassembled into SDU, these RLC SDU are delivered to the upper strata by no affirmation mode Service Access Point (UM-SAP), and deletion has recovered the PDU of SDU, contains except the PDU of particular length indication; If timer Timer_OSD is overtime, delete the PDU of all buffer memorys.

The shortcoming of prior art is to have ignored the situation that PDU comprises complete S DU, when the PDU that contains complete S DU is received separately, receiving terminal just not will consider direct recovery SDU, but the PDU before and after waiting for, if front and back PDU loses or can't receive within a certain period of time, the SDU that is contained among this PDU just can't be resumed out and be deleted.

In addition, contain the partial content that also may contain other SDU among the PDU of complete S DU, and these SDU and imperfect, whether at this moment this complete S DU should recover out, and indeterminate, and may cause and repeat reorganization, if for example when part SDU is incomplete, the complete SDU that has just received is just recovered, then may when receiving other parts of this SDU, this SDU be recovered one time again, caused complete unnecessary copy.

It is more obvious that this situation may show the influence of going up the access information (accessinformation) that sends at master control channel (MCCH), because one of function that out of order transmission is gone up application as MCCH is introduced into the interrupt problem of transmitting terminal at access information, the sequence number of front and back is all discontinuous when having caused access information to send.Be discontinuous separately when receiving terminal causes access information receiving, and the also whole often SDU of access information is in an independent PDU, it is necessary at this moment in time recovering for such access information.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of Radio Link to control protocol Data Unit data processing method in the out of order transfer function, at the operation of independent discontinuous PDU in the reorganization buffer memory of the out of order transfer function of MCCH, to avoid losing or copy of unnecessary SDU.

Control protocol Data Unit PDU data processing method in the out of order transfer function based on above-mentioned purpose Radio Link provided by the invention, comprising:

A) be received and after buffer memory gets up, whether be cached with current PDU continuous PDU in the inspection as a new PDU,, then handle by existing protocol if having; Otherwise, data are handled according to the strategy that pre-establishes;

When b) needing PDU in the deletion window when taking place that window moves or counter is overtime, the PDU that includes complete S DU is carried out data processing according to the strategy that pre-establishes.

This method step a) strategy that pre-establishes of described basis process that data are handled comprises:

A1) judge according to the Length Indication among the current PDU whether this PDU includes at least one complete SDU separately, if, then this PDU is carried out data processing according to the strategy that pre-establishes, return step a); Otherwise, directly return step a).

This method step a1) described method of PDU being carried out data processing, or is recombinated to PDU earlier and is delivered to the upper strata after recovering wherein complete SDU this PDU buffer memory for directly, again with this PDU deletion.

This method step a) strategy that pre-establishes of described basis process that data are handled is: current PDU is proceeded buffer memory.

This method step b) described data handling procedure comprises: check among the PDU of current needs deletion whether include complete SDU according to the Length Indication among the PDU, if have, then reorganization recovers described complete SDU and delivers to the upper strata from these PDU, and deletion is moved because of window or the overtime PDU that needs deletion of counter; Otherwise directly deletion is moved because of window or the overtime PDU that needs deletion of counter.

This method step b) described data handling procedure is: directly deletion is moved because of window or the overtime PDU that needs deletion of counter.

This method step b) described data handling procedure is: judge according to the Length Indication among the current PDU whether this PDU includes at least one complete SDU separately, if then according to the strategy that pre-establishes this PDU is carried out data processing; Otherwise deletion is moved because of window or the overtime PDU that needs deletion of counter.

The described step a1 of this method) if in include at least one complete S DU and other SDU partial contents among the current PDU, then reorganization recovers the complete SDU among the current PDU, buffer memory gets up, and delivers to the upper strata after waiting for one section Preset Time, and current PDU continues buffer memory and returns step a); Otherwise, directly return step a);

The described data handling procedure of step b) is: directly deletion is moved because of window or the overtime PDU that needs deletion of counter.

The described step a1 of this method) if in include at least one complete S DU and other SDU partial contents among the current PDU, then the complete SDU among the current PDU of reorganization recovery delivers to the upper strata, in buffer memory, mark and no longer send this SDU after this SDU has been resumed to the upper strata, current PDU continues buffer memory, returns step a);

The described mark that adds in buffer memory of this method comprises the sequence number of the SDU that has recovered at least.

The described step a1 of this method) if in include at least one complete S DU and other SDU partial contents among the current PDU, then delete behind the complete SDU among the current PDU of reorganization recovery, which SDU that delete on the notice upper strata is, current PDU continues buffer memory and returns step a);

From above as can be seen, the protocol Data Unit data processing method that Radio Link of the present invention is controlled in the out of order transfer function receives a PDU newly, and when not finding continuous with it PDU, further distinguish out and include a complete SDU separately according to the Length Indication among the current PDU, and include the situation of the PDU of a complete S DU and other SDU partial contents, and carry out data processing according to preassigned strategy respectively, thereby both avoided losing of useful information, also avoided issuable copy problem in the processing procedure.

Description of drawings

Fig. 1 is that existing 3GPP TS25.322 agreement Radio Link is controlled the protocol Data Unit data processing method schematic flow sheet in the out of order transfer function;

Fig. 2 is the schematic flow sheet of preferred embodiment one of the present invention;

Fig. 3 is the schematic flow sheet of preferred embodiment two of the present invention;

Fig. 4 is the schematic flow sheet of preferred embodiment three of the present invention;

Fig. 5 is the schematic flow sheet of preferred embodiment four of the present invention;

Fig. 6 is the schematic flow sheet of preferred embodiment five of the present invention.

Embodiment

The core concept that Radio Link of the present invention is controlled the protocol Data Unit PDU data processing method in the out of order transfer function comprises: when a new PDU is received and after buffer memory gets up, whether be cached with current PDU continuous PDU in the inspection, if have, then handle by existing protocol; Otherwise, continue buffer memory and wait for the next PDU of reception; When needing the PDU in the deletion window when taking place that window moves or counter is overtime, the PDU that includes complete S DU is carried out data processing according to the strategy that pre-establishes.

Below in conjunction with the drawings and specific embodiments the inventive method is further elaborated.

Embodiment one:

Step 101, media access control sublayer are carried out PDU and are received, when a new PDU is received and after buffer memory gets up, whether be cached with current PDU continuous PDU in the inspection, if have, then handle by existing protocol, promptly the PDU reorganization that can constitute complete S DU is recovered SDU and send into the upper strata; Otherwise, enter step 102.

Step 102 judges according to the Length Indication among the current PDU whether this PDU includes at least one complete SDU separately, if, deliver to the upper strata after then reorganization recovers this SDU, and with current PDU deletion; Otherwise, continue this PDU of buffer memory.

Step 103, when moving the PDU grand window that makes in the buffer memory owing to window or need PDU in the deletion window owing to counter Timer_OSD is overtime, check among current each PDU that needs to delete whether include complete SDU according to the Length Indication among the PDU, if have, then reorganization recovers described complete SDU and delivers to the upper strata from these PDU, and deletion is moved because of window or the overtime PDU that needs deletion of counter; Otherwise directly deletion is moved because of window or the overtime PDU that needs deletion of counter.

Generally, the PDU that includes complete S DU that detects in the step 103 is those situations that include at least one complete S DU and other SDU partial contents, therefore the complete SDU that contains among the PDU in this case can be recovered out by this step and delivers to the upper strata.

In the present embodiment, the process of step 102 also can be saved, and can handle in step 103 with the situation that includes at least one complete S DU and other SDU partial contents for the situation that includes at least one complete SDU among the PDU separately like this; So, if do not have buffer memory and the continuous PDU of current PDU in the window in the step 101 of Pei Heing with it, then continue this PDU of buffer memory.

Embodiment two:

Step 201, media access control sublayer are carried out PDU and are received, and when a new PDU is received and after buffer memory gets up, whether has been cached with current PDU continuous PDU in the inspection, if having, then handle by existing protocol; Otherwise, enter step 202.

Step 202 judges according to the Length Indication among the current PDU whether this PDU includes at least one complete SDU separately, if, deliver to the upper strata after then reorganization recovers this SDU, and with current PDU deletion; Otherwise, continue this PDU of buffer memory.

Step 203, when moving the PDU grand window that makes in the buffer memory owing to window or need PDU in the deletion window owing to counter Timer_OSD is overtime, directly deletion needs the PDU that deletes.

As seen, the difference of present embodiment and embodiment one is that for the situation that includes at least one complete S DU and other SDU partial contents, present embodiment is directly deleted it and do not recovered.

In addition, in the present embodiment, the process of step 202 also can be placed in the step 203 and carry out when the PDU in the needs deletion window again, promptly judge according to the Length Indication among the current PDU whether this PDU includes at least one complete SDU separately, if then this PDU is carried out data processing according to the strategy that pre-establishes; Otherwise, the PDU of buffer memory in the deletion current window; Perhaps the process of step 202 also can be saved, and so no matter for the situation that includes at least one complete SDU among the PDU separately, the situation that still includes at least one complete S DU and other SDU partial contents will be deleted together in step 203.If with do not have buffer memory and the continuous PDU of current PDU in the window in these two kinds of steps 201 that scheme cooperates, then continue this PDU of buffer memory.

Embodiment three:

Step 301, media access control sublayer are carried out PDU and are received, and when a new PDU is received and after buffer memory gets up, whether has been cached with current PDU continuous PDU in the inspection, if having, then handle by existing protocol; Otherwise, enter step 302.

Step 302 judges according to the Length Indication among the current PDU whether this PDU includes complete SDU, if include a SDU separately, delivers to the upper strata after then reorganization recovers this SDU, and with current PDU deletion; If include at least one complete S DU and other SDU partial contents, then enter step 303; If do not include complete SDU, continue this PDU of buffer memory.

Wherein, the described deterministic process of this step can realize suddenly in two steps specifically promptly elder generation judges whether current PDU includes complete SDU separately, if not, judge further then whether current PDU includes at least one complete S DU and other SDU partial contents.

Step 303, reorganization recovers the complete SDU among the current PDU, and buffer memory gets up, and delivers to the upper strata after waiting for one section Preset Time, continues the current PDU of buffer memory, and wait recovers after receiving the remainder of described other SDU of current PDU together.

Wherein, one section Preset Time of described wait should shift out the overtime time of sum counter Timer_OSD less than window, such as: if the time that window shifts out is that then this section Preset Time can be set to 16TTI about 64 TTI.

Step 304 when moving the PDU grand window that makes in the buffer memory owing to window or need PDU in the deletion window owing to counter Timer_OSD is overtime, is directly deleted the PDU that these need be deleted.

Embodiment four:

Step 401, media access control sublayer are carried out PDU and are received, and when a new PDU is received and after buffer memory gets up, whether has been cached with current PDU continuous PDU in the inspection, if having, then handle by existing protocol; Otherwise, enter step 402.

Step 402 judges according to the Length Indication among the current PDU whether this PDU includes complete SDU, if include a SDU separately, delivers to the upper strata after then reorganization recovers this SDU, and with current PDU deletion; If include at least one complete S DU and other SDU partial contents, then enter step 403; If do not include complete SDU, continue this PDU of buffer memory.

Step 403, reorganization recovers the complete SDU among the current PDU, deliver to the upper strata then, in buffer memory, label, be resumed and sent to the upper strata to identify this SDU, continue the current PDU of buffer memory, wait for the recovery of recombinating together behind the remainder that receives described other SDU of current PDU, then other SDU except labelling are sent into the upper strata.

Wherein, described labelling can be the sequence number of preserving described SDU in buffer memory.Certainly, those skilled in the art are easy to expect also to take other modes to label, and have been resumed SDU as long as identify this, thereby avoid the problem that repeats to recombinate.

Step 404 when moving the PDU grand window that makes in the buffer memory owing to window or need PDU in the deletion window owing to counter Timer_OSD is overtime, is directly deleted the PDU that these need be deleted.

Embodiment five:

Step 501, media access control sublayer are carried out PDU and are received, and when a new PDU is received and after buffer memory gets up, whether has been cached with current PDU continuous PDU in the inspection, if having, then handle by existing protocol; Otherwise, enter step 502.

Step 502 judges according to the Length Indication among the current PDU whether this PDU includes complete SDU, if include a SDU separately, delivers to the upper strata after then reorganization recovers this SDU, and with current PDU deletion; If include at least one complete S DU and other SDU partial contents, then enter step 503; If do not include complete SDU, continue this PDU of buffer memory.

Step 503, reorganization recovers the complete SDU among the current PDU, then with its deletion, which SDU that delete on the notice upper strata is, continue the current PDU of buffer memory, wait for the recovery of recombinating together behind the remainder that receives described other SDU of current PDU, and send into the upper strata.

Described notice can be the PDU sequence number+SDU position that sends the SDU of current deletion to the upper strata, represents the SDU of current deletion.Certainly, those skilled in the art are easy to expect also to take other modes to notify the upper strata.The problem that repeats to recombinate is avoided in the upper strata recovery operation of just can having known which SDU executed like this.

Step 504 when moving the PDU grand window that makes in the buffer memory owing to window or need PDU in the deletion window owing to counter Timer_OSD is overtime, is directly deleted the PDU that these need be deleted.

More than among each embodiment, for the situation that includes a SDU among the PDU separately, also can take not carry out recovering and with the direct strategy of deletion of current PDU.

Claims

1, Radio Link is controlled the protocol Data Unit PDU data processing method in the out of order transfer function, it is characterized in that, comprising:

A) be received and after buffer memory gets up, whether be cached with current PDU continuous PDU in the inspection as a new PDU,, then the PDU reorganization that can constitute complete S DU is recovered SDU and send into the upper strata if having;

If do not have, the described current PDU of buffer memory then, perhaps, according to the Length Indication among the current PDU, judge whether this current PDU includes at least one complete SDU, if comprise, then reorganization recovers to deliver to the upper strata and delete described current PDU behind the described complete SDU, if do not comprise, the described current PDU of buffer memory then;

When b) needing PDU in the deletion window when taking place that window moves or counter is overtime, directly delete the described PDU that needs deletion; Perhaps,

According to the Length Indication among the described PDU, judge among the described PDU that needs to delete whether include at least one complete SDU, if comprise, then reorganization is delivered to the upper strata and is deleted the described PDU that needs deletion after recovering described complete SDU, if do not comprise, then directly delete the described PDU that needs deletion.

2, method according to claim 1 is characterized in that, judges described in the described step a) that described PDU includes after at least one complete SDU, reorganization further comprises before recovering to deliver to the upper strata and delete described current PDU behind the described complete SDU:

Judge according to the Length Indication among the current PDU whether this PDU includes at least one complete SDU separately,, deliver to the upper strata after then reorganization recovers this complete SDU if comprise separately, and with current PDU deletion;

If do not comprise separately, then further judge whether include at least one complete S DU and other SDU partial contents among the current PDU according to the Length Indication among the current PDU, if, then reorganization recovers the complete SDU among the current PDU, and buffer memory gets up, and delivers to the upper strata after waiting for one section Preset Time, current PDU continues buffer memory, wait receives and recovers together behind the remainder of described other SDU of current PDU and deliver to the upper strata, if not, and this PDU of buffer memory then;

And in the described step b), when needing the PDU in the deletion window when taking place that window moves or counter is overtime, directly deletion is moved because of window or the overtime PDU that deletes of needing of counter.

3, method according to claim 2, it is characterized in that, when in judging current PDU, including at least one complete S DU and other SDU partial contents, further comprise in the time of the SDU of the described reorganization recovery of described buffer memory: in buffer memory, mark this SDU and be resumed.

4, method according to claim 3 is characterized in that, the described mark that adds in buffer memory comprises the sequence number of the SDU that has recovered at least.

5, method according to claim 1 is characterized in that, judges described in the described step a) that described PDU includes after at least one complete SDU, reorganization further comprises before recovering to deliver to the upper strata and delete current PDU behind the described complete SDU:

Judge according to the Length Indication among the current PDU whether this PDU comprises a complete SDU separately, if comprise separately, then reorganization recovers to deliver to the upper strata and delete current PDU behind the described complete SDU;

If do not comprise separately, then further judge whether include at least one complete S DU and other SDU partial contents among the current PDU according to the Length Indication among the current PDU, if, then delete behind the complete SDU among the current PDU of reorganization recovery, notice upper strata deletion be which SDU, current PDU continues buffer memory, waits for recovering together behind the remainder that receives described other SDU of current PDU and delivering to the upper strata, if not, this PDU of buffer memory then;