CN1780291B

CN1780291B - Data segment cascade and recombinant method

Info

Publication number: CN1780291B
Application number: CN 200410091341
Authority: CN
Inventors: 丁颖哲; 王艳红; 胡灏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-11-19
Filing date: 2004-11-19
Publication date: 2010-04-14
Anticipated expiration: 2024-11-19
Also published as: CN1780291A; WO2006053490A1

Abstract

The key features of method is: when the procedure in which the packet data unit (PDU) is built up by using current service data unit (SDU) needs to be interrupted, the sending end seals the special id into PDU and sends it. The method includes following steps: fragment cascade of current SDU is interrupted, and makes fragment cascade for SDU requiring to be inserted in order to build up PDU to sent out; the remaining data of the current SDU is made fragment cascade in order to build up PDU to send out. The invention also discloses a data reconstitution method.

Description

The method of a kind of data segment cascade and reorganization

Technical field

The present invention relates to the information transmission technology, refer to the method for a kind of data segment cascade and reorganization especially.

Background technology

Development along with the 3G (Third Generation) Moblie technology, people no longer are satisfied with speech business to the demand of mobile communication, because 3G (Third Generation) Moblie can provide than the more service of high data rate of second generation mobile communication, so a large amount of multimedia services emerge, such as: services such as Internet network are downloaded, browsed at a high speed to visual telephone, picture.Wherein, some applied business require a plurality of users can receive identical data simultaneously, such as: video request program, television broadcasting, video conference, online education, interactive game or the like.

In order effectively to utilize the mobile radio communication resource, 3G (Third Generation) Moblie has been introduced the notion of multicast and broadcasting, and multicast and broadcasting are a kind of technology that transmits data from a data source to a plurality of targets.Be exactly specifically, the WCDMA/GSM global standardsization organize 3GPP to propose multimedia broadcast/group broadcast service (MBMS, Multimedia Broadcast/Multicast Service), so-called MBMS provides a data source to send the point-to-multipoint service of data to a plurality of users in mobile communications network, 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.

Fig. 1 is for supporting the wireless network architecture schematic diagram of broadcasting/packet service, as shown in Figure 1, among the existing 3GPP, support that the wireless network architecture of broadcasting/packet service is a broadcasting/packet service server (BM-SC) 101, BM-SC 101 is by Gmb interface or Gi interface and TPF critical point GPRS Support Node (GGSN, Gateway GPRS Support Node) 102 link to each other, and a BM-SC 101 can link to each other with a plurality of TPF GGSN102; TPF GGSN 102 links to each other by Gn/Gp interface and Serving GPRS Support Node (SGSN, ServingGPRS Support Node) 103, and a GGSN 102 can link to each other with a plurality of SGSN 103; SGSN103 can link to each other with universal mobile telecommunications system (UMTS) land radio access web (UTRAN) 104 by the Iu interface, UTRAN 104 links to each other with user terminal (UE) 106 by the Uu interface then, SGSN 103 also can strengthen wireless access network (GERAN) 105 by Iu/Gb interface and global system for mobile communications (GSM) and link to each other, and GERAN 105 links to each other with UE 107 by Um Interface then.Wherein, GGSN and SGSN belong to the node in the core net in the wireless network (CN).

The network configuration that provides from Fig. 1 as can be seen, in order to support the MBMS business, in 3-G (Generation Three mobile communication system), increased mobile network functional entity--broadcast multicast service center, be BM-SC, described BM-SC is content provider's a inlet, be used for authorizing and initiating the MBMS bearer service, and plan transmits the MBMS content to schedule at mobile network.In addition, on functional entitys such as UE, UTRAN, GERAN, SGSN, GGSN, increased the function relevant with MBMS.

MBMS comprises multicast pattern and broadcast mode, and wherein 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 pattern and broadcast mode exist on business demand, cause also difference of operation flow separately, as shown in Figures 2 and 3, Fig. 2 is the operation flow schematic diagram of MSMS multicast pattern, Fig. 3 is the operation flow schematic diagram of MSMS broadcast mode.

As shown in Figure 2, the processing procedure that relates to of MBMS multicast service comprises: signatory (Subscription), service declaration (Service announcement), user add that (Joining), session begin (Session Start), MBMS notice (MBMS notification), data transmit (Data transfer), conversation end (SessionStop) and user and withdraw from (Leaving).Wherein, signatory process is used for allowing the user subscribe to required MBMS service in advance; Service declaration process is used for by the current service that can provide of BM-SC declaration; User's adition process is a MBMS activating multicast service process, UE is in adition process, informing network self is ready to become the member of current multicast group, receives corresponding professional multicast packet, and this adition process can be created the MBMS UE context of record UE information in the UE of network and adding multicast group; Session begins in the process, and BM-SC is ready to transfer of data, and informing network is set up the bearing resource of corresponding core net and Access Network; The MBMS notification procedure is used to notify UE MBMS multicast conversation to be about to begin; In data transfer procedure, BM-SC transfers data to UE by the bearing resource that session begins to set up in the process, the MBMS business has two kinds of patterns when transmitting between UTRAN and UE: point-to-multipoint (PTM) pattern and point-to-point (PTP) pattern, the PTM pattern sends identical data by the MTCH logic channel, all add multicast service or can receive the interested UE of broadcasting service, ptp mode sends data by the DTCH logic channel, has only a corresponding UE to receive; The conversation end process is used for the bearing resource that the session process that begins is set up is discharged; The user withdraws from process makes the subscriber in the group leave multicast group, i.e. user's receiving multicast data no longer, and this process can be with corresponding MBMS UE context deletion.

As shown in Figure 3, processing procedure that the MBMS broadcasting service relates to and MBMS multicast service are similar, just before session begins, do not need to carry out signatory process and user's adition process, and, after conversation end, do not need to carry out the user and withdraw from process.

At the data transfer phase of multimedia broadcast/multicast service, the MBMS business is transmitted information between UTRAN and UE mode has two kinds of patterns: put multiple spot (PTM) pattern and point-to-point (PTP) pattern.Wherein, 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 Traffic Channel (DTCH), has only a corresponding UE to receive.

In MBMS PTM transmission mode, relevant controlled in wireless information comprises business information, access information, radio bearer information, frequency layer convergence (FLC) information etc., is all sent to multiple spot control channel (MCCH) by logic channel such as MBMS point by Radio Resource control (RRC) layer.MCCH information is based on the fixed schedule mode and transmits, and in order to improve reliability, UTRAN can repeat MCCH information.Fig. 4 is MCCH transmission of Information scheduling schematic diagram, and as shown in Figure 4, all squares are MCCH information among the figure, and the cycle that repeats to send MCCH information is the repetition period, and complete MCCH information can periodically be sent in the repetition period; The modification cycle is defined as the repetition period of integral multiple, all will make amendment to MCCH information in each modification cycle; The access information of MBMS can periodically be sent in the access information cycle, and the access information cycle is that the integer of repetition period is cut apart.

MCCH information is divided into criteria information (Critical Info) and non-criteria information again, wherein, criteria information is made up of MBMS information of adjacent cells, MBMS business information, MBMS radio bearer information, and be the information that needs the periodicity emphasis recurrence to send, the content that is sent in each repetition period is constant, can only in the modification cycle, when sending for the first time, MCCH information just can be modified; Non-criteria information is meant access information, is the information that does not need the periodicity emphasis recurrence to send, and can revise at any time.The square that black is filled among Fig. 4 is non-criteria information, and unfilled square is a criteria information, and the square of filling with positive backslash is non-criteria information and the criteria information that content changes respectively.

The protocol stack structure of MCCH as shown in Figure 5, the protocol element of MCCH from top to bottom is followed successively by: rrc layer, wireless chain control layer (RLC), media access control layer (MAC), physical layer (PHY).Wherein, the mapping relations of MAC layer logical channel and physical layer FACH passage as shown in Figure 6, in existing systems, MCCH information is that the control information of MBMS all is mapped to forward access channel (FACH) and go up sends.Rlc layer uses Unacknowledged Mode (UM) to transmit MCCH information, in the prior art, the data transfer procedure of UM pattern as shown in Figure 7, the transmission method of MBMS control information mainly comprises the process of transmitting of transmit leg (Sender) RLCUM entity, and the receiving course of recipient (Receiver) RLCUM entity.Can send one or several PDU in each Transmission Time Interval, MAC determines size and the number of PDU in each Transmission Time Interval.

The process of transmitting of existing unacknowledged mode data protocol Data Unit (UMD PDU) is: after transmit leg RLC UM entity received high-rise unacknowledged mode data transmission request, the RLC Service Data Unit (SDU) that the transmit leg scheduling receives from high level sent; Send if there are one or more RLC SDU to be scheduled, then RLC UM entity notifies low layer to receive the data that comprise SDU number and size from high level earlier; RLC UM entity to the SDU segmentation, if possible also carries out cascade according to the PDU size of low layer indication then; Afterwards, it is VT (US) that the sequence number territory is set, for each SDU that finishes in UMD PDU is provided with the Length Indication territory; At last, submitting the UMD PDU of the number of asking to is the MAC layer to low layer, and for each UMD PDU that is submitted to low layer upgrades VT (US), simultaneously, buffering is not submitted to the SDU of low layer.

The receiving course of UMD PDU is: after recipient RLC UM entity was received one group of UMD PDU from low layer, this RLC UM entity upgraded VR (US) according to the UMD PDU that receives; If the renewal step-length of VR (US) is not equal to 1, then be discarded in the SDU that segmentation is arranged among the UMD PDU that loses, otherwise the UMD PDU that reorganization receives is RLC SDU, and the RLC SDU after the submission reorganization is a rrc layer to high level.

Wherein, the form of UMD PDU is as shown in Table 1:

Table one

In the form of rlc protocol UMD PDU, use Length Indication (LI, Length Indicator) indicates the position that RLC SDU finishes in this PDU, LI is except some predefined particular values, RLC head end position is to the byte number of RLC SDU in last byte of this PDU among the expression UMD PDU, and LI is 7 or 15.For the UM pattern, if maximum UMD PDU size＜=125 bytes are then used 7 LI, other situations are used 15 LI.Shown in table two, table three, table two is that the implication of 7 each particular values of LI is described to the implication of 7 LI and 15 each particular values of LI respectively, and table three is that the implication of 15 each particular values of LI is described.

Bit	Describe
Bit	Describe	0000000	Previous RLC PDU is just in time filled up by a RLC SDU, does not have the end of this SDU of Length Indication sign in previous RLC PDU
1111100	UMD PDU: first byte of this RLC PDU is first byte of a RLC SDU; AMD PDU: keep (in the present version, the PDU with this value is dropped)	0000000
1111100		1111101	Keep (in the present version, the PDU with this value is dropped)
1111110	The remainder of AMD PDU:PDU has comprised a cascade status protocol data cell (piggybacked STATUS PDU); UMD PDU: keep (at present	1111101
1111110			Version in, the PDU with this value is dropped)
1111111	The remainder of RLC PDU is a filling bit, and filling bit length can be zero		Version in, the PDU with this value is dropped)

Table two

Bit	Describe
Bit	Describe	000000000000000	Previous RLC PDU is just in time filled up by a RLC SDU, does not have LI to indicate the end of this SDU in previous RLC PDU
111111111111011	Last segmentation of RLC SDU also remains a byte after filling previous RLC PDU, does not have the end of LI sign RLC SDU in previous RLC PDU, ignores last byte among the previous PDU	000000000000000
111111111111011		11111111111100	The remainder of AMD PDU:PDU has comprised a cascade status protocol data cell (piggybacked STATUS PDU); UMD PDU: keep (in the present version, the PDU with this value is dropped)
111111111111101	Keep (in the present version, the PDU with this value is dropped)	11111111111100
111111111111101		111111111111110	The remainder of AMD PDU:PDU has comprised a cascade status protocol data cell (piggybacked STATUS PDU); UMD PDU: keep (in the present version, the PDU with this value is dropped)
111111111111111	The remainder of RLC PDU is a filling bit, and filling bit length can be zero	111111111111110

Table three

At present,, periodically send, and when having criteria information and non-criteria information to need RLC UM to handle simultaneously, non-criteria information may interrupt the transmission of criteria information, as shown in Figure 8 in order to guarantee access information according to the scheduling mode of MCCH information.Among Fig. 8, each square is represented a PDU, the square of sequence number 0 and sequence number 8 is the PDU that comprises non-criteria information SDU, and sequence number 1 is the PDU that comprises criteria information SDU to the square of sequence number 6, and sequence number 7, sequence number 9 to the square of sequence number 14 are the PDU that comprises same criterion information SDU.In order to guarantee that the non-criteria information of second access information in the cycle in time sends, when RLC UM receives when containing non-criteria information SDU, this SDU is carried out segment processing, be encapsulated into sequence number and be among 8 the RLC PDU and send, and do not have the criteria information that transmitted to continue in subsequent P DU, to send, promptly be encapsulated into sequence number respectively and be among 9,10,11,12,13,14 the RLC PDU and send.

But, send the processing procedure of inserting non-criteria information transmission for this criteria information that interrupts, the recipient some problems can appear: if sequence number is that 8 PDU is not because error of transmission is received Founder and really receives, even then sequence number is that 7,9,10,11,12,13,14 PDU is correctly received, the criteria information SDU that these PDU comprise can not be restructured, because the recipient does not know that No. 8 PDU that lose are other SDU or the segmentation of this criteria information SDU.So, just cause the recipient correctly to discern and to recombinate, thereby reduced reliability of information transmission.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of data segment cascade method, is convenient to the recipient and determines whether and can recombinate, and then improve reliability of information transmission.

Another object of the present invention is to provide a kind of data reconstitution method, make correctly recombination data of reception, thereby improve reliability of information transmission.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides a kind of method of data segment cascade, carry out the segmentation stage joint group when dressing up the process need of Packet Data Unit PDU and being interrupted at current business data cell SDU, the special identifier that transmit leg will indicate current SDU to be interrupted is encapsulated among the PDU and sends, this method comprises: interrupt the segmentation cascade to current SDU, the SDU that needs are inserted carries out the segmentation stage joint group and dresses up PDU and send, again to being carried out the segmentation cascade, be assembled into PDU and send afterwards by the remaining data of the current SDU that interrupted.

Wherein, described special identifier is that a value is the Length Indication territory that keeps particular value among the PDU, and different reservation particular values is represented different insertion PDU numbers; Or be that one or more get the Length Indication territory of identical reservation particular value among the PDU, the number of the PDU that the number in Length Indication territory equals to insert; Or for getting the different Length Indication territories that keep particular value, the number of the PDU that the number in Length Indication territory equals to insert among the PDU more than one; Or be Length Indication territory that value is undefined particular value among the PDU, and different undefined particular values is represented different insertion PDU numbers; Or be that one or more get the Length Indication territory of identical undefined particular value among the PDU, the number of the PDU that the number in Length Indication territory equals to insert; Or the Length Indication territory for getting different undefined particular values more than among the PDU, the number of the PDU that the number in Length Indication territory equals to insert; Or be that value is the Length Indication territory of the combination of reservation particular value and undefined particular value among the PDU.

This method further comprises: what the PDU number that SDU was assembled into that indication need insert was set in PDU interrupts the number territory, and then described special identifier is to get the Length Indication territory of particular value among the PDU and interrupt the number territory.Wherein, the particular value in described Length Indication territory is the particular value that the Length Indication territory keeps among the PDU; Or be the undefined particular value in Length Indication territory among the PDU.

In the such scheme, described reservation particular value is 1111101 or 111111111111101.

In the such scheme, described special identifier is encapsulated among the PDU is specially: special identifier is packaged among the PDU after the PDU that the SDU that need to insert is assembled into; Or, special identifier is packaged among the PDU before the PDU that the SDU that need to insert is assembled into.

In the such scheme, this method also comprises:

The recipient judges among the current PDU that receives whether carry special identifier, if carry, then determines the required PDU of reorganization SDU according to special identifier, and finishes the reorganization of SDU according to determined PDU; Otherwise, with the SDU that recombinates out in order of the data among the receiving PDU.

Wherein, described special identifier is encapsulated among the PDU is specially: special identifier is packaged among the PDU after the PDU that the SDU that need to insert is assembled into; Or described special identifier is encapsulated among the PDU is specially: special identifier is packaged among the PDU before the PDU that the SDU that need to insert is assembled into.

The present invention also provides a kind of method of data recombination, and this method comprises:

The recipient judges among the current PDU that receives whether carry special identifier, if carry, then determines the SDU irrelevant PDU corresponding with the current PDU of reorganization according to special identifier, ignores the reorganization that determined PDU finishes the SDU of current PDU correspondence then; Otherwise, with the SDU that recombinates out in order of the data among the receiving PDU.

Wherein, described special identifier is one or more Length Indication territories of getting particular value among the PDU; Then the recipient determines the SDU irrelevant PDU number corresponding with the current PDU of reorganization according to the number in the Length Indication territory of getting particular value among the PDU; Or be Length Indication territory of getting particular value among the PDU; Then the particular value got according to this Length Indication territory among the PDU of recipient is determined the PDU number that the SDU corresponding with the current PDU of reorganization has nothing to do; Or be to get the Length Indication territory of particular value among the PDU and interrupt the combination in number territory; Then the recipient determines the SDU irrelevant PDU number corresponding with the current PDU of reorganization according to the value that interrupts the number territory among the PDU.Wherein, the particular value in described Length Indication territory is the particular value that the Length Indication territory keeps, or is the undefined particular value in Length Indication territory, or is both combination.Described reservation particular value is 1111101 or 111111111111101.

In the such scheme, the described SDU irrelevant PDU corresponding with the current PDU of reorganization is positioned at before the current PDU, or is positioned at after the current PDU.

Data segment cascade provided by the present invention and recombination method, transmit leg after the PDU that inserts or before, show by special identifier whether adjacent PDU or adjacent afterwards PDU are the segmentation that comprises other SDU to current PDU before; Accordingly, the recipient judges whether each PDU carries special identifier when recombination data, if having, determines how to carry out data recombination according to the indication of special identifier.The present invention can guarantee correct identification of recipient and recombination data, avoided because the PDU that inserts does not receive, and the problem that other PDU that correctly receive can not be recombinated, and then improved reliability of information transmission.

The inventive method can adopt the LI that gets particular value in the PDU form as special identifier, and the particular value that described particular value can directly use LI to keep also can use undefined particular value among the LI; Special identifier can be carried on and insert before the PDU, also special identifier can be carried on and insert after the PDU; This special identifier is the number of the indication PDU that inserts further, and in a word, using method is varied, and therefore, the realization of the inventive method is flexible, convenient, simple.

In addition, method of the present invention is not limited only to the MBMS transmission of Information, so long as the environment that needs RLC UM entity to finish transfer of data can adopt above-mentioned implementation, the scope of application is wider.

Description of drawings

Fig. 1 is for supporting the wireless network architecture schematic diagram of broadcasting/packet service;

Fig. 2 is the operation flow schematic diagram of MSMS multicast pattern;

Fig. 3 is the operation flow schematic diagram of MSMS broadcast mode;

Fig. 4 is MCCH transmission of Information scheduling schematic diagram;

Fig. 5 is the protocol stack structure figure of MCCH;

Fig. 6 is the mapping relations figure of the FACH passage of the logical channel of MAC layer and physical layer;

Fig. 7 is the transmission means figure of MBMS control information;

Fig. 8 is for sending the transmission schematic diagram that comprises different information PDU in the prior art;

Fig. 9 is the process chart of transmit leg in the transmission method of the present invention;

Figure 10 is the process chart of recipient in the transmission method of the present invention.

Embodiment

Whether core concept of the present invention is: adopt the mode of carrying special identifier in PDU, indicate the SDU of current segmentation cascade to be interrupted.For transmit leg,, just carry special identifier and indicate if the SDU of current segmentation cascade is interrupted; For the recipient, detect whether contain special identifier among each PDU, to determine how to recombinate by the SDU of segmentation cascade.

Wherein, described special identifier can adopt the Length Indication territory of getting particular value in the PDU form, this special identifier can be carried among the PDU before the PDU that inserts, also can be carried among the PDU that inserts of the institute PDU afterwards.When adopting the particular value of LI, the particular value that can directly use LI to keep, or use undefined particular value among the LI, or adopt the combination that keeps particular value and undefined particular value; If insert an above PDU, this special identifier is the number of the indication PDU that inserts further.

Based on above-mentioned thought, the handling process of transmit leg may further comprise the steps as shown in Figure 9:

Step 901～904: transmit leg RLC UM entity receives the high-rise SDU that sends, and dress up in the process of PDU receiving SDU being carried out the segmentation stage joint group, judge the current SDU that whether exists needs to insert, such as non-criteria information SDU, if have, then interrupt segmentation cascade to the current SDU that is handling, to need the SDU that inserts to dress up PDU through segmentation cascade processed group simultaneously sends, after sending the PDU that needs insertion SDU composition, remaining data to the SDU that interrupted the segmentation cascade carries out the segmentation cascade again, is assembled into PDU and sends; And in interrupting insertion process, transmit leg RLC UM entity indicates current SDU to be interrupted with special identifier, and exactly concrete: the special identifier that will indicate current SDU to be interrupted is packaged in and sends to the recipient among the PDU; If there is not SDU to need to insert, then transmit leg RLC UM entity carries out normal segmentation cascade to the SDU that is received, is assembled into PDU and sends, and the SDU that is received is carried out the segmentation cascade successively that is:, is assembled into PDU and sends.Here, the PDU that is assembled into of the SDU that need to insert can be described as and inserts PDU.

Recipient's handling process may further comprise the steps as shown in figure 10:

Step 1001～1003: judge among the current PDU that receives whether carry special identifier,, then determine that according to special identifier which PDU is irrelevant with the current SDU that recombinates out, ignore determined PDU then, finish the reorganization of current SDU with relevant PDU if having; Otherwise, with the SDU that recombinates out in order of the data among the PDU that is received.Here, can determine the number of the PDU that inserts earlier according to special identifier, and then determine which PDU is and the irrelevant PDU of current SDU that recombinates out.

In recipient's of the present invention processing procedure, the recipient can determine whether the data among the unreceived PDU belong to the SDU of needs reorganization according to special identifier.Be exactly specifically: if find unreceived PDU, can judge whether earlier to carry special identifier among certain PDU,, the PDU of insertion is described if special identifier is arranged, so, just judge further according to special identifier whether unreceived PDU belongs to the PDU of insertion,, then need the SDU that recombinates unaffected if belong to, can continue to finish reorganization, if do not belong to, then explanation needs the SDU of reorganization to have partial data to lose, and corresponding SDU can not be recombinated; If there is not special identifier, illustrating needs the SDU of reorganization to have partial data to lose, and corresponding SDU can not be recombinated.

Below be example all to adopt the particular value that LI keeps in the PDU form, further specify the specific implementation of the inventive method.

Embodiment one:

In the present embodiment, described special identifier be arranged in the PDU after the PDU that inserts, this special identifier is the Length Indication territory among the UMD PDU, the value in this Length Indication territory is for keeping particular value 1111101 or 111111111111101, what indicate that the previous PDU of the PDU that comprises this Length Indication comprises is the segmentation of inserting other SDU, that is to say that the PDU that carries special identifier does not need PDU previous with it to recombinate.Here, previous PDU is meant the PDU of sequence number than current PDU little 1.

Transmit leg is when encapsulation UMD PDU, if what find that previous PDU comprises is the segmentation of inserting other SDU, then first Length Indication thresholding with current PDU is changed to 1111101 or 111111111111101.

Accordingly, the recipient when UMD PDU is reassembled into SDU, if find that the value in first Length Indication territory of a PDU receiving is 1111101 or 111111111111101, the previous PDU that then considers to ignore this PDU operation of recombinating.

For concreteness, adopt 7 LI in this example.Each TTI of RLC sends a UMDPDU at most, UMD PDU size is 128bit, RLC receives the SDU1 of a 200bit earlier, at first TTI, has assembled first segmentation that a PDU has sent SDU1, sequence number (SN) is 10, the E territory of this PDU is 0, and expression does not have Length Indication territory, Data territory to comprise first segmentation of SDU1, length is 120bit, and this PDU form as shown in Table 4.

Table four

At second TTI,, send SDU2 earlier because the arrival of the SDU2 of a new high priority need interrupt the transmission of SDU1.The size of supposing SDU2 is 48bits, then the sequence number that sends at second TTI be 11 PDU content as shown in Table 5, wherein, the E territory is that 1 expression the next field is the Length Indication territory.

Table five

At the 3rd TTI, continue to send the content of SDU1 because sequence number is 11 PDU for inserting PDU, so, sequence number be 12 PDU content as shown in Table 6.

SN＝’0001100’	E＝’1’
SN＝’0001100’	E＝’1’	LI＝‘1111101’	E＝’1’

SN＝’0001100’	E＝’1’
SN＝’0001100’	E＝’1’	LI＝‘0001010’	E＝’1’
LI＝‘1111111’	E＝’0’	LI＝‘0001010’	E＝’1’

Data(80bits)
Data(80bits)	PAD(24bits)

Table six

According to top sending method, even it is 11 PDU that the recipient does not receive sequence number, as long as correctly received sequence number and be 10 and sequence number be 12 PDU, be the Length Indication thresholding 1111101 of 12 PDU again according to sequence number, just can judge sequence number and be 11 PDU is a PDU who inserts, need not consider itself and sequence number be 10 and sequence number be the reorganization of 12 PDU, so just be that the 120bits of Data part among 10 the PDU and sequence number are that the 80bits of Data part reassembles into a SDU among 12 the PDU, obtain SDU1 with sequence number.

The size of the SDU that present embodiment inserts is restricted to: the SDU that can partly be held by the data field of a UMD PDU.

Embodiment two:

The realization principle of present embodiment and embodiment one is basic identical, it is the value difference in the Length Indication territory of adopting, the value in Length Indication territory is for keeping particular value 1111110 or 111111111111110 in the present embodiment, and what indicate that the previous PDU of the PDU that comprises this Length Indication comprises is the segmentation of inserting other SDU.

Perhaps, adopt other special LI values such as present undefined value 0000001 or 000000000000001, what indicate that the previous PDU of the PDU that comprises this Length Indication comprises is the segmentation of inserting other SDU.

Embodiment three:

Present embodiment is on the basis of embodiment one and embodiment two, being restricted to of the SDU size of enlarge inserting: the SDU that can partly be held by the data field of two UMD PDU.

Present embodiment adopts the particular value of two LI simultaneously, what indicate respectively that the previous PDU of the PDU that comprises this Length Indication comprises is the segmentation of inserting other SDU, and what comprise that second PDU in front of the PDU of this Length Indication comprise is the segmentation of inserting other SDU.That is to say that special identifier is for getting two Length Indication territories of these two particular values respectively in the present embodiment.Specifically: for 7 LI, what comprise that the previous PDU of PDU of this special identifier comprises with 1111101 indications is the segmentation of inserting other SDU, and what comprise that second PDU in front of the PDU of this special identifier comprise with 1111110 indications is the segmentation of other SDU of insertion; For 15 LI, what comprise that the previous PDU of PDU of this special identifier comprises with 111111111111101 indications is the segmentation of inserting other SDU, and what comprise that second PDU in front of the PDU of this special identifier comprise with 111111111111110 indications is the segmentation of other SDU of insertion.

For the recipient, can know that the current PDU that receives has inserted two PDU that comprise other SDU before according to two particular values of LI, when reorganization, just ignore two PDU of current PDU front.

Be example still with the object lesson among the embodiment one, if the size of SDU2 has exceeded the length that the data field of a PDU can hold, but the length range that can hold at the data field of two PDU, then the PDU of sequence number 11 and sequence number 12 can be used for sending the segmentation of SDU2, sequence number 13 beginnings continue to send the segmentation of SDU1 again, so, sequence number be 13 PDU content as shown in Table 7.

Table seven

Accordingly, the recipient can be known the PDU that should ignore sequence number 11 and sequence number 12 according to special identifier, and only the PDU with sequence number 10 and sequence number 13 recombinates, and obtains SDU1.

Embodiment four:

The realization principle of present embodiment and embodiment three is basic identical, is the implication difference of the value representative in the Length Indication territory of being adopted.In the present embodiment, for 7 LI, what comprise that the previous PDU of PDU of this special identifier comprises with 1111110 indications is the segmentation of inserting other SDU, and what comprise that second PDU in front of the PDU of this special identifier comprise with 1111101 indications is the segmentation of other SDU of insertion; For 15 LI, what comprise that the previous PDU of PDU of this special identifier comprises with 111111111111110 indications is the segmentation of inserting other SDU, and what comprise that second PDU in front of the PDU of this special identifier comprise with 111111111111101 indications is the segmentation of other SDU of insertion.

Perhaps, adopt other any two special Length Indication thresholdings such as present undefined particular values, what indicate respectively that the previous PDU of the PDU that comprises this special identifier comprises is the segmentation of inserting other SDU, and what comprise that second PDU in front of the PDU of this special identifier comprise is the segmentation of inserting other SDU.

Certainly, particular value, undefined particular value that also can adopt a LI to keep simultaneously.

Embodiment five:

Owing to need the SDU that inserts to be assembled into two or more PDU by segmentation, that is to say that the number that inserts PDU is two or more.At this situation, in the present embodiment, the reservation particular value or the undefined particular value in certain Length Indication territory directly can be used to refer to the number that current PDU inserts PDU before.Such as: with having inserted a PDU before the current PDU of 1111101 indications; With having inserted two PDU before the current PDU of 1111110 indications; With having inserted three PDU or the like before the current PDU of 0000001 indication.In the present embodiment, special identifier is the Length Indication territory of a value for the reservation particular value, or the Length Indication territory that value is undefined particular value, and different particular values is represented the number of the different PDU of insertion.

Embodiment six:

Owing to need the SDU that inserts to be assembled into two or more PDU by segmentation, that is to say that the number that inserts PDU is two or more.At this situation, present embodiment can be got the mode that certain keeps the Length Indication territory of particular value by repeated use, represents that current PDU inserts the number of PDU before.In the present embodiment, special identifier is a plurality of Length Indication territories of getting identical reservation particular value, such as: the value in Length Indication territory is for keeping particular value 1111110, and there are four to insert PDU, so, in the form of current PDU, after the sequence number SN, repeat four LI=" 1111101 ".

Certainly, also can reuse the particular value that keeps in other Length Indication territories, such as: 1111110 or 111111111111110.Perhaps, reuse any one undefined particular value in the Length Indication territory.

So, the recipient just according to the reservation particular value that is adopted in the Length Indication territory or the number of undefined particular value, determines current PDU insignificant PDU number before after receiving current PDU.

Embodiment seven:

Owing to need the SDU that inserts to be assembled into two or more PDU by segmentation, that is to say that the number that inserts PDU is two or more.At this situation, in the present embodiment, can be by using undefined particular value in two above Length Indication territories, or the particular value and the combination of undefined particular value that keep in two above Length Indication territories, each particular value is used for representing a PDU of insertion before the current PDU.In the present embodiment, special identifier is a plurality of Length Indication territories of getting different undefined particular values, or is a plurality of Length Indication territories of getting different undefined particular values and keeping the particular value combination.

Embodiment eight:

Owing to need the SDU that inserts to be assembled into two or more PDU by segmentation, that is to say that the number that inserts PDU is two or more.At this situation, present embodiment increases new territory in UMD PDU, should increase the number that the territory is used to identify PDU that insert the front newly, this newly-increased territory and value are formed special identifier jointly for the Length Indication territory that keeps particular value, and this special identifier is arranged in the PDU of the PDU back of inserting.Such as: increase and to be provided with one and to interrupt number (Interrupt number) territory, then amended UMD PDU form as shown in Table 8:

Table eight

The implication in E territory is as shown in Table 9 after revising:

Bit	Describe
Bit	Describe	0	The next field is data, status PDU incidentally or filling bit
1	The next field is Length Indication and extended bit or interrupts number and extended bit	0

Table nine

Need a special Length Indication value to represent that the next field is to interrupt the number territory simultaneously.For example: adopting 1111101 or 111111111111101 indication the next fields is to interrupt the number territory.

Transmit leg is when encapsulation UMD PDU, if find that there is the PDU that comprises the segmentation of inserting other SDU the front, then first Length Indication thresholding with current PDU is changed to 1111101 or 111111111111101; Simultaneously, next encapsulation interrupts number territory, the number of the PDU that the value in this territory equals to insert previously.

Accordingly, the recipient is when recombinating out SDU according to UMD PDU, if first Length Indication territory value of the PDU that discovery receives is 1111101 or 111111111111101, then read the next field simultaneously, promptly interrupt the number territory, determine that what PDU that insert the front has, and ignores the PDU that this PDU inserts previously when current PDU being recombinated operation.

Embodiment nine:

The realization principle of present embodiment and embodiment eight is basic identical, and just adopting the reservation particular value indication the next field in the different Length Indication territories is to interrupt the number territory.

Perhaps, adopt other any special Length Indication thresholding such as present undefined values, indicating the next field is to interrupt the number territory.

Embodiment ten:

The realization principle of present embodiment and embodiment one is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 11:

The realization principle of present embodiment and embodiment two is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 12:

The realization principle of present embodiment and embodiment three is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 13:

The realization principle of present embodiment and embodiment four is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 14:

The realization principle of present embodiment and embodiment five is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 15:

The realization principle of present embodiment and embodiment six is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 16:

The realization principle of present embodiment and embodiment seven is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 17:

The realization principle of present embodiment and embodiment eight is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Embodiment 18:

The realization principle of present embodiment and embodiment nine is basic identical, just is used for identifying the special identifier of inserting PDU and is arranged in the PDU PDU before that is inserted, and other settings and handling process are identical.

Such scheme is applicable to wireless communication systems such as GPRS, EDGE, WCDMA, TD-SCDMA, and is applicable to a lot of flow processs, as: common UMD PDU transfer process has UMDPDU transfer process of out of order transmitting function or the like.The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims

1. the method for a data segment cascade, it is characterized in that, carry out the segmentation stage joint group when dressing up the process need of Packet Data Unit PDU and being interrupted at current business data cell SDU, the special identifier that transmit leg will indicate current SDU to be interrupted is encapsulated among the PDU and sends, this method comprises: interrupt the segmentation cascade to current SDU, the SDU that needs are inserted carries out the segmentation stage joint group and dresses up PDU and send, and again the remaining data of the current SDU that interrupted is carried out the segmentation cascade afterwards, is assembled into PDU and sends.

2. method according to claim 1 is characterized in that, described special identifier is that a value is the Length Indication territory that keeps particular value among the PDU, and different reservation particular values is represented different insertion PDU numbers.

3. method according to claim 1 is characterized in that, described special identifier is one or more Length Indication territories of getting identical reservation particular value among the PDU, the number of the PDU that the number in Length Indication territory equals to insert.

4. method according to claim 1 is characterized in that, described special identifier is to get the different Length Indication territories that keep particular value, the number of the PDU that the number in Length Indication territory equals to insert among the PDU more than one.

5. method according to claim 1 is characterized in that, described special identifier is Length Indication territory that value is undefined particular value among the PDU, and different undefined particular values is represented different insertion PDU numbers.

6. method according to claim 1 is characterized in that, described special identifier is one or more Length Indication territories of getting identical undefined particular value among the PDU, the number of the PDU that the number in Length Indication territory equals to insert.

7. method according to claim 1 is characterized in that, described special identifier is the Length Indication territory of getting different undefined particular values among the PDU more than, the number of the PDU that the number in Length Indication territory equals to insert.

8. method according to claim 1 is characterized in that, described special identifier is that value is the Length Indication territory of the combination of reservation particular value and undefined particular value among the PDU.

9. method according to claim 1, it is characterized in that, this method further comprises: what the PDU number that SDU was assembled into that indication need insert was set in PDU interrupts the number territory, and then described special identifier is to get the Length Indication territory of particular value among the PDU and interrupt the number territory.

10. method according to claim 9 is characterized in that, the particular value in described Length Indication territory is the particular value that the Length Indication territory keeps among the PDU; Or be the undefined particular value in Length Indication territory among the PDU.

11., it is characterized in that described reservation particular value is 1111101 or 111111111111101 according to claim 2,3,4,8 or 10 described methods.

12., it is characterized in that described special identifier is encapsulated among the PDU is specially according to each described method of claim 1 to 10: special identifier is packaged among the PDU after the PDU that the SDU that need to insert is assembled into.

13., it is characterized in that described special identifier is encapsulated among the PDU is specially according to each described method of claim 1 to 10: special identifier is packaged among the PDU before the PDU that the SDU that need to insert is assembled into.

14., it is characterized in that this method also comprises according to each described method of claim 1 to 10:

15. method according to claim 14 is characterized in that, described special identifier is encapsulated among the PDU is specially: special identifier is packaged among the PDU after the PDU that the SDU that need to insert is assembled into.

16. method according to claim 14 is characterized in that, described special identifier is encapsulated among the PDU is specially: special identifier is packaged among the PDU before the PDU that the SDU that need to insert is assembled into.

17. the method for a data recombination is characterized in that, this method comprises:

18. method according to claim 17 is characterized in that, described special identifier is one or more Length Indication territories of getting particular value among the PDU; Then the recipient determines the SDU irrelevant PDU number corresponding with the current PDU of reorganization according to the number in the Length Indication territory of getting particular value among the PDU.

19. method according to claim 17 is characterized in that, described special identifier is Length Indication territory of getting particular value among the PDU; Then the particular value got according to this Length Indication territory among the PDU of recipient is determined the PDU number that the SDU corresponding with the current PDU of reorganization has nothing to do.

20. method according to claim 17 is characterized in that, described special identifier is to get the Length Indication territory of particular value among the PDU and interrupt the combination in number territory; Then the recipient determines the SDU irrelevant PDU number corresponding with the current PDU of reorganization according to the value that interrupts the number territory among the PDU.

21. method according to claim 18 is characterized in that, the particular value in described Length Indication territory is the particular value that the Length Indication territory keeps, or is the undefined particular value in Length Indication territory, or is both combination.

22. method according to claim 19 is characterized in that, the particular value that the particular value in described Length Indication territory keeps for the Length Indication territory, or be the undefined particular value in Length Indication territory.

23., it is characterized in that described reservation particular value is 1111101 or 111111111111101 according to claim 21 or 22 described methods.

24., it is characterized in that the described SDU irrelevant PDU corresponding with the current PDU of reorganization is positioned at before the current PDU, or is positioned at after the current PDU according to each described method of claim 17 to 22.