CN1794694A - Data processing method for resetted window parameter of radio chain circuit control layer receiving end - Google Patents

Abstract

This invention discloses a data process method after re-setting window parameters of a control layer receiving end of two kinds of wireless links, in which, the first one includes: when the parameters of the buffer storage zone window of the receiving end is set small by the upper layer, then A, determining the top and bottom borders of a new window based on the diameter of the new window, B, obtaining data belonging to the original window but in the new window based on the top and bottom borders of the new one, C, processing data obtained in step B, D, correcting part or all correlated parameters of the receiving end windows, the second includes: when the parqmeters of the receiving end window is set to be large by the upper layer, then a, determining borders of the new window based on the parameters of th new window, b, obtaining data belonging to the new window but not included in the original windown, c, deleting the data obtained in step b.

Description

Data processing method after wireless chain control layer iSCSI receiving end window parameter is reset

Technical field

The nothing that the present invention relates to wireless chain control layer (RLC) is confirmed the data transmission technology under the transmission mode, is not particularly having under the transmission mode of affirmation the data processing method after wireless chain control layer iSCSI receiving end window parameter is reset.

Background technology

Wireless chain control layer (RLC) is the sublayer that is positioned between media access control layer (MAC) and the layer 3, and its function mainly contains the transmission of user data, cuts apart, recombinates and connect, error correction and encryption or the like.The RLC entity is supported three types of business altogether, transparent mode business (TM), no affirmation mode business (UM) and affirmation mode business (AM).RLC sub-layer entities model is referring to Fig. 1, and Fig. 1 is a RLC sub-layer entities model schematic diagram, and wherein, subscriber equipment (UE) inserts universal land radio access web (UTRAN) by wave point and communicates.TM sending entity among the UE and TM receiving entity, UM sending entity and UM receiving entity, AM entity respectively with URARN in corresponding TM receiving entity and TM sending entity, UM receiving entity and UM sending entity, AM entity carry out alternately the transmission data.

Specifically: the transparent mode business is finished by independently sending and receive the transparent mode entity.Sending entity receives SDU from high level and is divided into suitable rlc protocol data cell (PDU), need not add any expense, send media access control sublayer to by Broadcast Control Channel (BCCH), Paging Control Channel (PCCH), SHCCH Shared Channel Control Channel (SHCCH), Common Control Channel (CCCH), Dedicated Traffic Channel a certain channels such as (DTCH).Receiving entity receives PDU from media access control sublayer, these PDU is reassembled into RLC Service Data Unit (SDU) again and sends the upper strata to.

No affirmation mode business is finished by independently sending and receive no affirmation mode entity.Sending entity receives SDU from high level and is divided into the RLC PDU of suitable size or different SDU are connected to form a RLC PDU, encloses a RLC head and put into transmit buffer to send it to media access control sublayer by some logic channels.Receiving entity receives PDU by a certain logic channel from media access control sublayer, decaptitates and it is reassembled into SDU to send to high level.

The affirmation mode business is to be finished by the transmission of an associating and confirmation of receipt pattern entity.Send and receive two types PDU-control PDU and professional PDU.The transmitter side entity receives SDU from high level to be cut apart or connects into the professional PDU of RLC, and an additional RLC head is put into and sent and retransmission buffer sends it to media access control sublayer by one to two logic channel.Under affirmation mode, the professional PDU of all transmissions needs the affirmation of peer-entities whether to decide re-transmission.Control PDU be generate by RLC entity self some at status report that receives PDU and reset request etc.The receiver side entity receives PDU from media access control sublayer, extracts incidentally state information, puts into reception buffer, wait for that complete PDU reorganization SDU sends to the upper strata, or sending wrong confirmation of receipt by its transmitter side again requires peer-entities to retransmit PDU.

The different business model of different service types utilization is finished transmission, and here the multimedia broadcast/multicast service (MBMS:Multimedia Broadcast/Multicast Service) of organizing 3GPP to propose for the WCDMA/GSM global standardsization mainly adopts the UM pattern to finish transmission between the RLC sublayer.Because professional type, the data service that MBMS requires the mobile network to provide a data source to put multiple spot to a plurality of users transmission at a high speed, the real-time that it receives for UE is had relatively high expectations and accuracy is relatively low, need not all confirm one by one all packets that network sends.

Multicast and broadcasting are a kind of technology that transmits data from a data source to a plurality of targets.In traditional mobile network, cell broadcaste service (CBS:Cell Broadcast Service) allows low bit rate data to share broadcast channel to all users' transmissions by the sub-district, belongs to information series business.

Now, people no longer are satisfied with phone and messaging service to the demand of mobile communication, fast development along with 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, the WCDMA/GSM global standardsization organize 3GPP to propose multimedia broadcast/multicast 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 utilance of 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.

In order to support the MBMS business, increased mobile network functional entity---broadcast multicast service center BM-SC among the mobile network newly, it is content provider's a inlet, be used for authorizing and initiating the MBMS bearer service at mobile network, and plan transmits the MBMS content to schedule.In addition, functional entitys such as subscriber equipment (UE), land radio access web (UTRAN), GERAN, SGSN, GGSN strengthen, and have increased the relevant function of MBMS.

Such network configuration is referring to Fig. 2, and Fig. 2 is for supporting the wireless network architecture schematic diagram of multicast/broadcast business.Wherein, broadcast/multicast service center (BM-SC) is passed through Gmb interface or Gi interface and gateway general packet radio service (GPRS) support node (GGSN, Gateway GPRS SupportNode) and is linked to each other, and a BM-SC can link to each other with a plurality of GGSN; GGSN links to each other by Gn/Gp interface and Serving GPRS Support Node (SGSN, Serving GPRS Support Node), and a GGSN can link to each other with a plurality of SGSN; SGSN can link to each other with universal mobile telecommunications system (UMTS) land radio access web (UTRAN) by the Iu interface, UTRAN links to each other with communication terminal by the Uu interface then, SGSN also can strengthen wireless access network (GERAN) by Iu/Gb interface and global system for mobile communications (GSM) and link to each other, and GERAN links to each other with communication terminal by Um Interface then.

MBMS comprises multicast pattern and broadcast mode.The distinctive points of multicast service and broadcasting service only is: multicast service only sends corresponding information to the user who has subscribed to some information, and the broadcasting service then user of all in wireless network sends information.Multicast pattern needs user's corresponding multicast group of contracting, and carries out activation of service, and produces corresponding charge information.Because it is different that multicast and broadcast mode exist, cause also difference of its operation flow on business demand.

The MBMS business has two kinds of patterns when transmitting between UTRAN and UE: put multiple spot (PTM) pattern and point-to-point (PTP) pattern.The PTM pattern sends identical data by MBMS point-to-multipoint service channel (MTCH), and all add multicast service or can receive the interested UE of broadcasting service; Ptp mode sends data by dedicated transmission channel (DTCH), has only a corresponding UE to receive.

The entire flow that the user receives certain MBMS broadcasting service comprises:

1, professional announce (Service announcement) notifies user MBMS the relevant information of business;

2, session begins (Session Start), and BM-SC is ready for sending data;

3, MBMS notice (MBMS notification) RNC notifies user MBMS muticast data transmission;

4, transfer of data (Data transfer)

5, conversation end (Session Stop) process, BM-SC has not been ready for sending data, and bearing resource can discharge.

The entire flow that the user receives certain MBMS multicast service comprises:

1, the user subscribes to (Subscription);

2, professional announce (Service announcement);

3, adding (Joining), session begin (Session Start);

4, session begins (Session Start);

5, MBMS notice (MBMS notification);

5, transfer of data (Data transfer);

6, conversation end (Session Stop);

7, leave (Leaving) process.

Compare with the MBMS broadcasting service, multicast service has increased user's subscription (Subscription) process, adding (joining) process and has left (leaving) process.

Wherein, user's subscription (Subscription) is a process of setting up the contact between user and the service supplier.Adding (joining) process is that the user notification network prepares to receive the MBMS business procedure.Leaving (leaving) is that the user no longer is the member's of MBMS multicast group a process.

Just because of the utilization of MBMS business, in order to optimize this business, some new functions are introduced in the RLC UM entity, and they all are better to receive real-time MBMS business at receiving terminal in order to make the user.One in order to solve sub-district reception merging " repeating to avoid and reorder " (Duplicate Avoidance and Reordering, DAR) function; Another receiving terminal when solving out of order transmission problem " out of order transmission " (OSD:Out of SequenceDelivery) function that reorders timely fast.

Introduce between latter two peer-entities of DAR function transmission as shown in Figure 3, Fig. 3 is the transmission schematic diagram of two RLC peer-entities in the MBMS business.Wherein:

UE inserts URTAN by wave point (Uu) and communicates.At the UTRAN end, the SDU that UM Service Access Point (UM-SAP) transmits the upper strata sends to transmitting terminal UM RLC entity.Transmitting terminal UM RLC entity receives SDU and is cached to the transmission buffering area earlier, is divided into PDU through over-segmentation and cascade then, adds the RLC expense again and send to UE by Uu in PDU.

The receiving terminal UM RLC entity of UE receives PDU and carries out the DAR function treatment earlier, carry out buffer memory to the rx-side buffering district again after, PDU is removed the RLC expense, send to that the reorganization buffer area carries out buffer memory and the reorganization back sends to the upper strata by UM-SAP.

The DAR function is introduced RLC UM entity and only is used for the transmission that logic channel MTCH is the MBMS service message from first operation that media access control sublayer receives behind the PDU as receiving terminal.Introducing DAR function is the reliability in order to ensure the MBMS business.Because UE can receive user data from the same MBMS business of different districts, make UE when receiving PDU, duplicate and/or the upsetting of order.Therefore in order to make receiving terminal PDU be sent into the receiving terminal buffer memory SDU that recombinates out, introduce the DAR function according to correct and unduplicated order.

The principle of DAR function is the window of UE with a certain size, and promptly one of the fixed size fixed position section spatial cache comes the PDU that receives by sequence number size order buffer memory.This window can be described as the DAR window.These PDU may may not be continuous also from different sub-districts, can be used for waiting for the PDU that transmits from other sub-districts later the time by these PDU of sequence number size order buffer memory.The PDU of buffer memory is just comparatively complete like this, and window also can be used for the detection of copy on the other hand.

The DAR window can be represented by sequence number and the window size of PDU, increase along with the sequence number of the PDU that receives, the upper bound of window is reach thereupon also, for example window size is 8, the maximum sequence number of the PDU of current reception is 16, and window can be by sequence number 9～16 expressions, and after this sequence number of Jie Shouing is that 9～16 PDU should write this buffer area, if received a sequence number this moment and be 17 PDU, then the window reach is sequence number 10～17.Because the size of spatial cache own is fixed, big PDU deposits the DAR window in along with the sequence number of new reception, near original PDU the window lower bound, possible grand window.The PDU of these grand windows will be admitted to the next reorganization buffer memory that receives and remove the SDU that recombinates.Meanwhile, do not move for a long time or move slowly in order to prevent window, system stipulates that a maximum delay time is used to force window interior to divide PDU to be sent to the next reorganization buffer memory that receives and removes the SDU that recombinates.

Quoting simultaneously of DAR function introduced series of parameters for RLC UM entity.Mainly contain three state variables:

1, " VR (UDR) " expression is first sequence number that is not sent to the PDU that receives the reorganization buffer memory in order, the promptly next sequence number that should be sent to the PDU of reorganization buffer area according to the order of sequence.

2, " VR (UDT) " and timer together service marking receive the reorganization buffer no matter wherein have unreceived PDU or not when overtime which PDU should be forced to deliver to

3, that value of sequence number maximum among the PDU that is buffered in window that receives of " VR (UDH) " expression.

The DAR function has been introduced a timer " Timer_DAR " and has been used to stop not having for a long time PDU to be sent to the state that receives the reorganization buffer.Also have a protocol parameter " DAR_Window_Size " to be used to represent the window size of buffer memory PDU, both can store what PDU at most in window.

At present, the process prescription for the DAR function is roughly as follows in the 3GPP TS25.322 agreement:

1, when receiving a PDU from media access control sublayer, at first judges whether first PDU for receiving.

1) if first PDU that the DAR function is received, then:

Init state variable V R (UDH) is the sequence number of this PDU

Init state variable V R (UDR)=VR (UDH)-DAR_Window_Size+1

2, ordinary circumstance whether VR (UDH) 〉=SN 〉=VR (the UDH)-DAR_Window_Size+1 within the DAR receive window of the PDU sequence number SN that receives that judges:

1) if the sequence number of the PDU that receives within receive window:

If the PDU of sequence number SN＜VR (UDR) or same sequence number is buffered, then delete the new PDU that receives; Otherwise the PDU that will newly receive deposits buffer area in by the sequence number size.

2) if receive sequence number SN SN＜VR (UDH)-DAR_Window_Size+1 or SN＞VR (UDH) outside the DAR receive window of a PDU:

A, renewal VR (UDH)=SN, window moves thereupon, deposits the PDU that newly receives in buffer area in order;

B, for the PDU of all sequence numbers less than VR (UDH)-DAR_Window_Size+1, shift out buffer memory and deliver to and receive the reorganization buffer memory and go to finish the SDU reorganization.

If c is VR (UDR)＜VR (UDH)-DAR_Window_Size+1 then upgrades VR (UDR) VR (UDR)=VR (UDH)-DAR_Window_Size+1.

If this is that the PDU of sequence number SN=VR (UDR) has existed in the buffer memory for d:

If the PDU that begins continuous sequence number is arranged from VR (UDR)+1 buffer memory, shifts out buffer memory with them and delivers to and receives the reorganization buffer memory and go to finish the SDU reorganization.

VR (UDR) is updated to x+1, and x is the sequence number that is admitted to that PDU that sequence number is the highest among the PDU that receives the reorganization buffer memory here.

In existing protocol, in the function of high level to the replacement of RLC parameter, the situation after parameter DAR_Window_Size is by high layer reset is described.Yet in actual transmissions, when the physical transfer condition changes, when reducing such as downstream rate, service needed is reshuffled, and the size of DAR receive window also needs to adjust.The variation of window size can influence the speed that receives PDU reorganization SDU, so receiver window also will be adjusted to adapt to the downstream rate of adjustment thereupon.

After parameter DAR_Window_Size is by high layer reset, new window may be littler than original window, thereby cause some PDU to change to outside the window, perhaps because window becomes big, and some PDU is changed to outside window within the window, for the not explanation of operating protocol of these PDU.Because it is clear that agreement is not set forth, and may cause these PDU to be retained in the buffer memory, neither be sent to next acceptance in the reorganization buffer memory, also untimely deletion is overflowed until buffer memory, makes the mistake.Perhaps buffer memory has been deleted those PDU that should not delete and is caused the SDU that should recombinate to restructure in next function.

In addition, because the change of window size, what may cause is losing of continuous PDU, can't deliver to and receive the reorganization buffer memory.Because at present the DAR function only is used for MTCH, transmission be business datum, and do not have retransmission mechanism, this losing may cause that PDU's forever lose the SDU that can't recombinate.These mistakes all can directly have influence on MBMS user and receive the quality of data.

Summary of the invention

In view of this, main purpose of the present invention is to provide the data processing method after two kinds of wireless chain control layer iSCSI receiving end window parameters are reset, the reception mistake that the receiving terminal of minimizing rlc layer may occur after window parameter changes.

For achieving the above object, the technical scheme of the data processing method after the first wireless chain control layer iSCSI receiving end window parameter provided by the invention is reset specifically is achieved in that

Data processing method after a kind of wireless chain control layer iSCSI receiving end window parameter is reset, when receiving terminal buffer area window size parameter by last stratification hour, do following processing:

A, determine the upper and lower border of new window according to the new window size parameter;

B, according to the upper and lower border of new window, obtain and belong to parent window and be not included in data in the new window;

C, the data that step B is obtained are carried out data processing;

D, the part or all of iSCSI receiving end window relevant parameter of modification.

This method may further include:

When the iSCSI receiving end window size parameter is big by last stratification, do following processing:

E, determine the border of new window according to the new window size parameter;

F, according to the border of new window, obtain and belong to new window and be not included in data in the parent window;

G, the data deletion that step F is obtained.

The method on described definite new window border can for:

The coboundary of parent window is defined as the coboundary of new window, determines the lower boundary of new window with this coboundary and new window size parameter.

Step B is described obtain belong to parent window and be not included in the data in the new window method can for:

The sequence number of the data in the parent window and the upper and lower border of new window are compared, judge which data and drop on outside the new window, obtain and drop on the outer data of new window.

Step F is described obtain belong to new window and be not included in the data in the parent window method can for:

The sequence number of the data in the new window and the upper and lower border of parent window are compared, judge which data and drop on outside the parent window, obtain and drop on the outer data of parent window.

The method of the described data processing of step C can for:

The data recombination buffer area is deleted or sent to data.

Described step C can be all deletions or all send to the data recombination buffer area of: data that step B is obtained;

Or the metadata cache that step B is obtained is after the scheduled time, with their all deletions or all send to the data recombination buffer area.

Described step C also can for:

Whether the data that determining step B obtains have the continuous data of sequence number, if having, then continuous data are sent to the data recombination buffer area, with discontinuous data deletion; Otherwise, with all discontinuous data deletions.

Described step C can also for:

Whether the data that determining step B obtains have the continuous data of sequence number, if having, then continuous metadata cache are sent to the data recombination buffer area after the scheduled time, and discontinuous data are directly deleted; Otherwise, direct deletion of all data or buffer memory were deleted after the scheduled time;

Or whether the data that determining step B obtains have the continuous data of sequence number, if having, then continuous data directly sent to the data recombination buffer area, and discontinuous metadata cache was deleted after the scheduled time; Otherwise, direct deletion of all data or buffer memory were deleted after the scheduled time.

Described step C may further include: with the discontinuous metadata cache scheduled time, the scheduled time judges whether that then the data sequence number of new reception and data in buffer are continuous, if having then will be in the buffer memory receive the continuous data of data and the new data that receive send to the data recombination buffer area with new; Otherwise discontinuous data deletion with buffer memory.

The described scheduled time with discontinuous metadata cache can be set to receive a needed time of data at least.

Described step C may further include: the data of record deletion or send to the highest data sequence number in the data of data recombination buffer area, the data sequence number of judging sequence number that whether continuous a plurality of data are arranged in the new window and record is continuous, if have, then the continuous data of these sequence numbers in the new window are sent to the data recombination buffer area.

Described step D can comprise:

If the D1 new window has continuous data to be sent to the data recombination buffer area, will be updated to then that sequence number of sequence number maximum adds one in the data that send to the data recombination buffer area with iSCSI receiving end window relevant parameter: state variable VR (UDR);

If new window does not have continuous data to be sent to the data recombination buffer area, then state variable VR (UDR) is updated to the lower boundary of new window;

D2, whether deleted or be admitted to data recombination buffer area, if then restart timer, and replacement VR (UDT) be the interior the highest sequence number value of data of present window if checking that sequence number equals the data of iSCSI receiving end window relevant parameter: VR (UDT); Otherwise do not revise VR (UDT).

For achieving the above object, the technical scheme of the data processing method after second kind of wireless chain control layer iSCSI receiving end window parameter provided by the invention is reset specifically is achieved in that

Data processing method after a kind of wireless chain control layer iSCSI receiving end window parameter is reset is characterized in that, when the iSCSI receiving end window size parameter is big by last stratification, does following processing:

A, determine the border of new window according to the new window size parameter;

B, according to the border of new window, obtain and belong to new window and be not included in data in the parent window;

C, the data deletion that step b is obtained.

Wherein, the method on the described definite new window of step a border can for:

The coboundary of parent window is defined as the coboundary of new window, determines the lower boundary of new window with this coboundary and new window size parameter.

Step b is described obtain belong to new window and be not included in the data in the parent window method can for:

The sequence number of the data in the new window and the upper and lower border of parent window are compared, judge which data and drop on outside the parent window, obtain and drop on the outer data of parent window.

As seen from the above technical solutions, data processing method after these two kinds of wireless chain control layer iSCSI receiving end window parameters of the present invention are reset, first kind is to diminishing owing to the window size parameter, the parent window partial data that causes being excluded outside new window carries out data processing, again other parameters relevant with window is carried out corresponding modify.Second kind is to becoming big owing to the window size parameter, the data that cause having comprised the parent window that is not included in new window are deleted processing, that is to say, the present invention is after the iSCSI receiving end window parameter is reset, parent window or new window partial data are handled, thereby the phenomenon that buffer memory overflows can not occur, and can reduce loss of data.Therefore, the present invention has guaranteed that receiving terminal under the physical transfer condition that changes, still can receive data with higher accuracy.

Description of drawings

Fig. 1 is a RLC sub-layer entities model schematic diagram;

Fig. 2 is for supporting the wireless network architecture schematic diagram of multicast/broadcast business;

Fig. 3 is the transmission schematic diagram of two RLC peer-entities after the introducing DAR function in the MBMS business;

Fig. 4 is the flow chart of data processing figure after the DAR window is reset in the present invention's first preferred embodiment;

The example schematic that Fig. 5 a is reduced for the DAR window;

Fig. 5 b is the extended example schematic of DAR window;

Fig. 6 is the flow chart of data processing figure after the DAR window is reset in the present invention's second preferred embodiment.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.

Data processing method after these two kinds of wireless chain control layer iSCSI receiving end window parameters of the present invention are reset, first kind is to diminishing owing to the window size parameter, the parent window partial data that causes being excluded outside new window carries out data processing, again other parameters relevant with window is carried out corresponding modify.Second kind is to because the window size parameter becomes big, and the data that cause having comprised the parent window that is not included in new window are deleted processing.

In the data processing method after first kind of wireless chain control layer iSCSI receiving end window of the present invention parameter is reset, the data processing that the parent window partial data of getting rid of outside new window is carried out can be deletion or send to reorganization buffer area etc. and shift out the data processing that receives buffer area, also can be other processing, the present invention is described in detail below to lift two preferred embodiments.

First preferred embodiment:

Referring to Fig. 4, Fig. 4 is the flow chart of data processing figure after the DAR window is reset in the present invention's first preferred embodiment.This flow process may further comprise the steps:

Step 401 receives the window size parameter of the high-rise new configuration that sends.When descending transmission rate reduces or increases, high-rise can reducing or increase the DAR window is corresponding to adapt to the speed of adjustment.

Step 402 according to the window size parameter, is determined the upper and lower border of new window, and judges the window size situation of change, if window size does not change, does not then process, directly process ends; If it is big that window becomes, then execution in step 403; If window diminishes, then execution in step 405.

In this step, determine that the method on the upper and lower border of new window is: the coboundary of parent window is defined as the coboundary of new window, determines the lower boundary of new window with this coboundary and new window size parameter.

Such as the situation shown in Fig. 5 a, the example schematic that Fig. 5 a is reduced for the DAR window.Wherein solid line is represented parent window, and dotted line is represented new window; A11, A9, A8, A7, A6, A4 represent that respectively sequence number is 11,9,8,7,6,4 PDU.Its parent window size is 8, and sequence number is 4～11, and the size parameter of new window changes 4 into, and then the new window coboundary is 11 still, and lower boundary changes 11-4+1=8 into.

Situation shown in Fig. 5 b for another example, Fig. 5 b is the extended example schematic of DAR window.Wherein, solid line is represented parent window, and dotted line is represented new window; A11, A9, A8, A4 represent that respectively sequence number is 11,9,8,4 PDU.Its parent window size is 4, and sequence number is 8～11, and the size parameter of new window changes 8 into, and then the new window coboundary is 11 still, and lower boundary changes 11-8+1=4 into.

Step 403 is judged in the new window, whether has comprised the data that parent window does not comprise; If have, then execution in step 404; Otherwise, process ends.

Concrete determination methods can for: data sequence number in the new window and the upper and lower border of parent window are compared,, have then comprised the data that parent window does not comprise in the new window if this data sequence number drops on outside the parent window.

Step 404 is obtained the data that the parent window in the new window does not comprise, with its deletion back process ends.

Referring to Fig. 5 b, wherein PDU A4 has been included within the new window greatly owing to window size becomes, and A4 is not included in the parent window.At this moment, just A4 is deleted.This be because, in the practical application, be PDU not to be arranged outside the window, if having, think that then this PDU is wrong the reception, therefore, in this step, with its deletion.

Step 405 is obtained and is belonged to parent window and be not included in PDU in the new window, with all deletions or all send to the reorganization buffer area of these PDU.

In this step, also can be with the PDU that obtains elder generation predetermined a period of time of buffer memory, such as the time of 1 TTI, and then these data are all deleted or all send to the reorganization buffer area.

Present embodiment considers that the outer PDU of new window may be considered to because parameter resetting and otiose PDU, or ignoring the of short duration SDU that may occur interrupts, for simple to operateization of UE receiving terminal, make clear simultaneously, the PDU outer these new windows in time deletes.

Certainly, also can think useful PDU by the PDU that new window is outer, in this case, they be sent to the reorganization buffer area carry out the reorganization of SDU.

Be the deletion or send to the reorganization buffer area, can set according to system's actual needs situation.

Step 406 writes down deleted PDU or is sent to the highest sequence number X of PDU of reorganization buffer area.

Step 407 judges that whether a plurality of PDU are arranged in the new window is mutually continuous with X, just judges the continuous P DU whether X+1～X+n is arranged in the new window, and n is the number of continuous P DU in the new window, if then execution in step 408; Otherwise execution in step 409.

Step 408 sends to the reorganization buffer area with the continuous P DU of X+1～X+n in the new window.

Step 409 is revised the window relevant parameter, process ends.

Specifically, this step can comprise two processes:

1, the renewal of VR (UDR):, will be updated to then that sequence number of sequence number maximum adds among the PDU that sends to the reorganization buffer area with iSCSI receiving end window relevant parameter: state variable VR (UDR) if new window has continuous P DU to be sent to the reorganization buffer area; If new window does not have continuous P DU to be sent to the data recombination buffer area, then state variable VR (UDR) is updated to the lower boundary of new window;

2, whether the renewal of VR (UDT) and timer: it is deleted or be admitted to the reorganization buffer area to check that sequence number equals the PDU of iSCSI receiving end window relevant parameter: VR (UDT), if, then restart timer, and replacement VR (UDT) is the highest sequence number value of PDU in the new window; Otherwise do not revise VR (UDT).

Be example still, adopt the method for this example, A4, A6, A7 are deleted or all send to the reorganization buffer area entirely, simultaneously because A7 and A8, A9 are continuous with Fig. 5 a.Therefore, A8, A9 also send to the reorganization buffer area, and VR (UDR) is updated to 10.If former VR (UDT) is 7, then restart timer, and replacement VR (UDT) is 11.

Second preferred embodiment:

Referring to Fig. 6, Fig. 6 is the flow chart of data processing figure after the DAR window is reset in the present invention's second preferred embodiment.This flow process may further comprise the steps:

Step 601 receives the window size parameter of the high-rise new configuration that sends.

Step 602 according to the window size parameter, is determined the upper and lower border of new window, and judges the window size situation of change, if window size does not change, does not then process, directly process ends; If it is big that window becomes, then execution in step 603; If window diminishes, then execution in step 605.

The method on upper and lower border of determining new window in the present embodiment is with embodiment illustrated in fig. 4 identical, no longer repeat specification here.

Step 603 is judged in the new window, whether has comprised the data that parent window does not comprise; If have, then execution in step 604; Otherwise, process ends.

Step 403 is identical in concrete determination methods and the flow process shown in Figure 4, repeats no more here.

Step 604 is obtained the data that the parent window in the new window does not comprise, with its deletion back process ends.

Step 605 judges whether the outer PDU that belongs to parent window of new window has continuously, if then execution in step 607, otherwise execution in step 606.

Step 606, the discontinuous PDU that new window is belonged to parent window outward deletes, and the highest sequence number X of the PDU of record deletion, execution in step 609.

In this step, the PDU buffer memory scheduled time that can will delete earlier, this time can be set to receive a needed time of PDU at least, such as TTI etc.The scheduled time then judges whether the new PDU that receives has with deleted PDU is continuous, if having, then PDU that will newly receive and the one or more PDUs continuous with it send to the reassembly buffer district; If do not have then with the PDU of buffer memory deletion.

Step 607, outer continuous PDU sends to the reorganization buffer area with new window, with discontinuous PDU deletion.

In this step, multiple implementation can be arranged:

1, directly the outer continuous PDU of new window is sent to the reorganization buffer area, with discontinuous PDU deletion;

2, directly the outer continuous PDU of new window is sent to the reorganization buffer area, with the discontinuous PDU buffer memory scheduled time, such as deletion again behind the TTI;

Under this mode, the scheduled time then can judge further whether the PDU of new reception has with deleted PDU is continuous, if having, then PDU that will newly receive and the one or more PDUs continuous with it send to the reassembly buffer district, if do not have then with the PDU of buffer memory deletion.

3, with the outer continuous PDU buffer memory scheduled time of new window,, discontinuous PDU is directly deleted such as sending to the reorganization buffer area again behind the TTI.

Present embodiment is considered in the PDU that shifts out, if continuous a plurality of SDU possibilities of recombinating so are bigger, less for independent PDU reorganization SDU possibility, if part PDU disappearance is arranged, the piecemeal PDU of the SDU of all these PDU correspondences also will be deleted by next recombination function so.Therefore in this step, with discontinuous PDU deletion.

Step 608, record send to the highest sequence number x of the PDU of reorganization buffer area.

Step 609 is judged the continuous P DU whether X+1～X+n is arranged in the new window, if then execution in step 610; Otherwise execution in step 611.

Step 610 sends to the reorganization buffer area with the continuous P DU of X+1～X+n in the new window.

Step 611 is revised the window relevant parameter, process ends.

The method of revising the window relevant parameter in this step is identical with the step 409 in embodiment illustrated in fig. 4, here no longer repetition.

In above-mentioned two embodiment, all comprised the data processing after window size becomes greatly, in the practical application, because under the normal condition, there is not PDU outside the parent window, therefore, when using the inventive method, the situation that window diminishes can be only considered, the purpose of the reception mistake that minimizing may occur can be reached equally.Certainly, can only consider that also window size becomes under the big situation, when window size occurring and become big, according to second kind of scheme provided by the invention, only the data that the parent window in the new window is not comprised are deleted processing.Though this situation is not frequent appearance, also can reach the purpose that reduces some reception mistakes that may occur.

By the above embodiments as seen, the data processing method after these two kinds of wireless chain control layer iSCSI receiving end window parameters of the present invention are reset has guaranteed that receiving terminal under the physical transfer condition that changes, still can receive data with higher accuracy.

Claims (16)

1, the data processing method after a kind of wireless chain control layer iSCSI receiving end window parameter is reset is characterized in that, when receiving terminal buffer area window size parameter by last stratification hour, do following processing:

A, determine the upper and lower border of new window according to the new window size parameter;

B, according to the upper and lower border of new window, obtain and belong to parent window and be not included in data in the new window;

C, the data that step B is obtained are carried out data processing;

D, the part or all of iSCSI receiving end window relevant parameter of modification.

2, data processing method as claimed in claim 1 is characterized in that, this method further comprises:

When the iSCSI receiving end window size parameter is big by last stratification, do following processing:

E, determine the border of new window according to the new window size parameter;

F, according to the border of new window, obtain and belong to new window and be not included in data in the parent window;

G, the data deletion that step F is obtained.

3, data processing method as claimed in claim 1 or 2 is characterized in that, the method on described definite new window border is:

The coboundary of parent window is defined as the coboundary of new window, determines the lower boundary of new window with this coboundary and new window size parameter.

4, data processing method as claimed in claim 1 is characterized in that, step B is described to be obtained the method that belongs to parent window and be not included in the data in the new window and be:

The sequence number of the data in the parent window and the upper and lower border of new window are compared, judge which data and drop on outside the new window, obtain and drop on the outer data of new window.

5, data processing method as claimed in claim 2 is characterized in that, step F is described to be obtained the method that belongs to new window and be not included in the data in the parent window and be:

The sequence number of the data in the new window and the upper and lower border of parent window are compared, judge which data and drop on outside the parent window, obtain and drop on the outer data of parent window.

6, data processing method as claimed in claim 1 is characterized in that, the method for the described data processing of step C is:

The data recombination buffer area is deleted or sent to data.

7, data processing method as claimed in claim 6 is characterized in that, described step C is: the data recombination buffer area is all deleted or all send to the data that step B obtains;

Or the metadata cache that step B is obtained is after the scheduled time, with their all deletions or all send to the data recombination buffer area.

8, data processing method as claimed in claim 6 is characterized in that, described step C is:

Whether the data that determining step B obtains have the continuous data of sequence number, if having, then continuous data are sent to the data recombination buffer area, with discontinuous data deletion; Otherwise, with all discontinuous data deletions.

9, data processing method as claimed in claim 8 is characterized in that, described step C is:

Whether the data that determining step B obtains have the continuous data of sequence number, if having, then continuous metadata cache are sent to the data recombination buffer area after the scheduled time, and discontinuous data are directly deleted; Otherwise, direct deletion of all data or buffer memory were deleted after the scheduled time;

Or whether the data that determining step B obtains have the continuous data of sequence number, if having, then continuous data directly sent to the data recombination buffer area, and discontinuous metadata cache was deleted after the scheduled time; Otherwise, direct deletion of all data or buffer memory were deleted after the scheduled time.

10, data processing method as claimed in claim 8, it is characterized in that, described step C further comprises: with the discontinuous metadata cache scheduled time, the scheduled time judges whether that then the data sequence number of new reception and data in buffer are continuous, if having then will be in the buffer memory receive the continuous data of data and the new data that receive send to the data recombination buffer area with new; Otherwise discontinuous data deletion with buffer memory.

11, data processing method as claimed in claim 10 is characterized in that: the described scheduled time with discontinuous metadata cache is set to receive a needed time of data at least.

12, as claim 7 or 8 described data processing methods, it is characterized in that, described step C further comprises: the data of record deletion or send to the highest data sequence number in the data of data recombination buffer area, the data sequence number of judging sequence number that whether continuous a plurality of data are arranged in the new window and record is continuous, if have, then the continuous data of these sequence numbers in the new window are sent to the data recombination buffer area.

13, data processing method as claimed in claim 12 is characterized in that, described step D comprises:

If the D1 new window has continuous data to be sent to the data recombination buffer area, will be updated to then that sequence number of sequence number maximum adds one in the data that send to the data recombination buffer area with iSCSI receiving end window relevant parameter: state variable VR (UDR);

If new window does not have continuous data to be sent to the data recombination buffer area, then state variable VR (UDR) is updated to the lower boundary of new window;

D2, whether deleted or be admitted to data recombination buffer area, if then restart timer, and replacement VR (UDT) be the interior the highest sequence number value of data of present window if checking that sequence number equals the data of iSCSI receiving end window relevant parameter: VR (UDT); Otherwise do not revise VR (UDT).

14, the data processing method after a kind of wireless chain control layer iSCSI receiving end window parameter is reset is characterized in that, when the iSCSI receiving end window size parameter is big by last stratification, does following processing:

A, determine the border of new window according to the new window size parameter;

B, according to the border of new window, obtain and belong to new window and be not included in data in the parent window;

C, the data deletion that step b is obtained.

15, data processing method as claimed in claim 14 is characterized in that, the method on the described definite new window of step a border is:

The coboundary of parent window is defined as the coboundary of new window, determines the lower boundary of new window with this coboundary and new window size parameter.

16, data processing method as claimed in claim 14 is characterized in that, step b is described to be obtained the method that belongs to new window and be not included in the data in the parent window and be:

The sequence number of the data in the new window and the upper and lower border of parent window are compared, judge which data and drop on outside the parent window, obtain and drop on the outer data of parent window.

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