CN100431291C - Intersection-protocol data unit method for wireless link control layer transmitting determination mode - Google Patents
Intersection-protocol data unit method for wireless link control layer transmitting determination mode Download PDFInfo
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Abstract
The method comprises: when the sending end receives a high priority SDU from upper layer, the fragmentation, cascade connection and filling are made for the high priority SDU to form HPDU, and then the HPDU is inserted in front of the PDU already completing the fragmentation, cascade connection and filling, and not yet sent out; based on the head expansion type (HE) or the length indication (LI), a PDU is determined as a HPDU; in addition, establishing a buffer, and inputting the value of LI ah HE into the buffer; after all HPDUs of a same SDU are collected, a SDU is recombined and is sent to upper layer.
Description
Technical field
The present invention relates to the Radio Link control (Radio Link Control:RLC) in Wideband Code Division Multiple Access (WCDMA) (the Wideband Code Division Multiple Access:WCDMA) cell mobile communication systems, especially the method for transmitting determination mode (Acknowledged Mode:AM) intersection-protocol data unit (HybridProtocol Data Unit:HPDU) in the Radio Link control rlc layer.
Background technology
Radio Link control rlc protocol is being controlled the transmission of data wireless links bag in the WCDMA system.The AM rlc protocol is a kind of control protocol based on sliding window.At transmitting terminal, upper-layer service data cell (Service DataUnit:SDU) is handled through cutting, serial connection, filling, the protocol Data Unit (ProtocolData Unit:PDU) that forms specific size sends to the opposite end, and the packet of losing is retransmitted automatically.At receiving terminal, the PDU that receives is reassembled into SDU deliver to the upper strata.
Among Fig. 1, the RLC transmitting terminal has the square of cross hatching to be meant that the opposite end confirms not received the packet that need resend, blank square is represented the buffer memory that do not take, there is the square of horizontal line or vertical line to represent the packet of waiting for that the opposite end is confirmed, the part of identical horizontal line or vertical line is same Service Data Unit in the packet, and the part that oblique line is arranged is state bag (Status PDU) or a filling part incidentally.The RLC receiving terminal has the square of cross hatching to represent that the opposite end sends to lose the packet that need receive again, blank square is represented the buffer memory that do not take, there is the square of horizontal line or vertical line to represent the packet of having received, the part of identical horizontal line or vertical line is same SDU in the packet, and the part that oblique line is arranged is state bag or a filling part incidentally.The size of transmission and receive window is by the configuration of upper-layer protocol layer, and unit represents that with the PDU number RLC transmitting terminal and receiving terminal are according to the size application buffer memory of send window.
The rlc protocol basic variable is described as follows among Fig. 1, and wherein VT represents the variable of transmitting terminal, and VR represents the variable of receiving terminal.
VT (S): send state variable.The sequence number of the next PDU that this value representation will send (removing the PDU that retransmits);
VT (A): confirm state variable.The sequence number of the continuous PDU that the next wait receiving terminal of this value representation is confirmed;
VT (MS): maximum send state variable.The PDU sequence number will not allow to send more than or equal to this value.VT (MS)=VT (A)+VT (WS), VT (WS) is the send window size;
VR (R): accepting state variable.The sequence number of the next continuous PDU that this value representation will receive;
VR (H): best expectation accepting state variable.The sequence number of the highest PDU that expression expectation receives;
VR (MR): the maximum state variable that allows reception.The sequence number of PDU will be rejected by the RLC receiving terminal more than or equal to this value, VR (MR)=VR (R)+VR (WR), and VR (WR) is the receive window size.
In the existing protocol regulation, receive the SDU that the upper strata sends at AM RLC, if the maximum length that the length of SDU can be carried greater than PDU then becomes suitable length to be carried by PDU the SDU burst; If less than the maximum length that PDU can carry, can use piggy mechanism and serial connection technology.The form of the AM PDU that stipulates in the agreement as shown in Figure 2.
The implication in each territory of AM PDU is as follows among Fig. 2:
Type (D/C, Data or Control PDU): having indicated this PDU is control PDU or data PDU, and length is 1bit, 0 expression control PDU, 1 expression data PDU;
Sequence number (SN, Sequence Number): the sequence number of AM PDU, identify a specific PDU, can be used to retransmit and reorganization, length is 12bit;
Poll bit (P, Polling bit): be used for to the report of recipient's solicited status, the recipient can send one or more STATUS PDU, and length is 1bit, and 0 expression does not need status report, and 1 expression needs status report;
Expansion type (HE, Header Extension Type): whether be Length Indication, length is 2bit if being used to refer to next byte, and 00 expression subsequent byte is data, and 01 expression subsequent byte is Length Indication and extension bits, and 10 and 11 keep;
Extension bits (E, Extension bit): whether be Length Indication and extension bits, length is 1bit if being used to refer to next byte, and the next byte of 0 expression is data, incidentally status PDU or filling block, and the next byte of 1 expression is Length Indication and extension bits;
Data field (Data): the data of representing actual SDU;
Fill area or state bag incidentally (PAD or a piggybacked STATUS PDU): if the fill area recipient should abandon, state bag receiving terminal incidentally needs normal process.
Length Indication (LI:Length Indicator): Length Indication, last byte of indication each RLC SDU in PDU is to the length of RLC head, unit is a byte number, length can be 7bit or 15bit, adopt the indication of 7 bit lengths when the length of AM PDU of configuration is less than or equal to 126 bytes, the length of AM PDU adopts the indication of 15 bit lengths during greater than 126 bytes;
Defined following particular value during 7 LI:
0000000: represent that previous PDU has carried last burst of SDU just and do not had U to indicate this SDU to finish in previous PDU;
1111100: keep, the PDU that has LI to equal this value will be received end and abandon;
1111101: keep, the PDU that has LI to equal this value will be received end and abandon;
1111110: the remainder of expression PDU is a status PDU incidentally;
1111111: the remainder of expression PDU is a filling part.
Defined following particular value during 15 LI:
000000000000000: represent that previous PDU has carried last burst of SDU just and do not had LI to indicate this SDU to finish in previous PDU;
111111111111011: represent that previous PDU has carried last burst of SDU just and do not had LI to indicate this SDU to finish in previous PDU, and the length of final data subtracts 1 length that just equals last fragment data of SDU among the PDU; Not needing when needing with this sign 7 LI during 15 LI with similar sign is that Length Indication need account for 2 bytes during because of 15 LI;
111111111111100: keep, the PDU that has LI to equal this value will be received end and abandon;
111111111111101: keep, the PDU that has LI to equal this value will be received end and abandon;
111111111111110: the remainder of expression PDU is a status PDU incidentally;
111111111111111: the remainder of expression PDU is a filling part.
According to the agreement regulation, when transmitting terminal SDU length is big, the SDU burst must be become a plurality of PDU to send, the SN of the PDU behind the same SDU burst is continuously necessary, otherwise receiving terminal can't carry out correct reorganization.So RLC can't add the PDU of the higher SDU correspondence of priority in a SDU burst PDU at present, can't handle the situation of HPDU, promptly the SDU of high priority seizes the processing of low priority SDU.
Summary of the invention
The invention provides the method that sends AM HPDU in a kind of wireless chain control layer, effectively overcome in the prior art and can't carry out the situation that SDU burst PDU seizes, realize the preferential transmission of SDU at wireless chain control layer.
Technical scheme of the present invention is, on the basis of existing technology, when transmitting terminal is received upper strata high priority SDU, this high priority SDU is carried out burst, serial connection, filling processing formation HPDU, be inserted into and finish that burst, serial connection, filling are handled but before the PDU that do not send as yet, use an expansion type HE or Length Indication LI sign HPDU, realize the preferential HPDU of transmission; Receive the PDU of lower floor at receiving terminal, be judged as HPDU according to an expansion type HE or Length Indication LI among the PDU; Open up buffering in addition, the data among the HPDU are put into this buffering according to a Length Indication LI or an expansion type HE; All HPDU of same top layer SDU are collected, reassemble into SDU and deliver to the upper strata.
Describedly this high priority SDU is formed HPDU be embedded into and finish among the PDU that burst, serial connection, filling handle, be meant before first the common PDU after transmitting terminal is inserted into HPDU VT in the transmit queue (S), and will behind the common PDU behind the VT (S), move originally, the SN that is about to the common PDU behind the original VT (S) increases, and the amplitude of increase is the number of HPDU.
The expansion type HE of AM PDU is defined as follows when using HE sign HPDU:
00: the expression subsequent byte is common PDU data;
01: the expression subsequent byte is common PDU Length Indication and extension bits;
10: the expression subsequent byte is the HPDU data;
11: the expression subsequent byte is HPDU Length Indication and extension bits.
The Length Indication LI of AM PDU is defined as follows when using LI Length Indication sign HPDU:
During 7 LI, 1111101 these PDU of expression are HPDU;
During 15 LI, 111111111111101 these PDU of expression are HPDU;
Or:
During 7 LI, 1111100 these PDU of expression are HPDU;
During 15 LI, 111111111111100 these PDU of expression are HPDU.
Adopt the present invention, needs carry out that SDU burst PDU seizes or strict timed sending situation under, do not need newly-built RLC entity or use a plurality of logic channels to realize sending and receiving, effectively conserve system resources reduces system complexity, improves the stability of a system.Be specially adapted to most of SDU length and need preferential situation about sending than SDU big and that part is less.
Description of drawings
Fig. 1 is the radio link control schematic diagram;
Fig. 2 is an AM PDU structure chart;
Fig. 3 is the radio link control schematic diagram of band AM HPDU;
Fig. 4 sends the HPDU flow chart for transmitting terminal;
Fig. 5 receives the HPDU flow chart for receiving terminal.
Embodiment
Below in conjunction with Fig. 3, Fig. 4 and Fig. 5 the concrete enforcement of such scheme receiving terminal and transmitting terminal is described in detail.For convenience of description, the preferential SDU that sends of needs is called the SDU that interweaves (Hybrid Service Data Unit:HSDU).
Fig. 3 is for sending the signal process of HPDU.Transmitting terminal has the square of cross hatching to be meant that the opposite end confirms not received the packet that need resend, blank square is represented the buffer memory that do not take, there is the square of horizontal line or vertical line to represent the packet of waiting for that the opposite end is confirmed, the part of identical horizontal line or vertical line is same Service Data Unit in the packet, the part that oblique line is arranged is state bag (Status PDU) or a filling part incidentally, has the square that horizontal line and vertical line intersect to represent the preferential packet that sends.The RLC receiving terminal has the square of cross hatching to represent that the opposite end sends to lose the packet that need receive again, blank square is represented the buffer memory that do not take, there is the square of horizontal line or vertical line to represent the packet of having received, the part of identical horizontal line or vertical line is same SDU in the packet, the part that oblique line is arranged is state bag or a filling part incidentally, has the square that horizontal line and vertical line intersect to represent the preferential packet that sends.The PDU of SDU4 is HPDU among Fig. 3, and transmitting terminal preferentially sends the HPDU of SDU4, sends the remaining PDU of SDU3 again.
Fig. 4 is the performing step that sends HPDU according to technical scheme provided by the present invention at wireless chain control layer:
Step 1:RLC receives top layer SDU, judges according to the SDU type, if do not need preferential transmission for common SDU then carry out the processing of common SDU, this process repeats no more herein, and flow process finishes; Need preferential the transmission if this SDU is HSDU, then change step 2 over to;
Step 2:RLC judges whether that according to the length of HSDU and the PDU length of configuration needs carry out burst, then changes step 3 if desired over to, if do not need then forward step 4 to;
Step 3: HSDU is carried out burst handle, forward step 4 to;
Step 4: judge whether that according to the length of HSDU or the PDU length of a burst PDU, configuration at last of HSDU needs are connected in series, serial connection then forwards step 5 to if desired, otherwise forwards step 6 to;
Step 5: last burst PDU of HSDU or HSDU is connected in series processing with next HSDU, forwards step 6 to;
Step 6: judge whether that according to the PDU length of the last burst PDU of the length of HSDU or HSDU, configuration needs fill, then forward step 7 if desired to, otherwise forward step 8 to;
Step 7: the remainder of HPDU is filled processing;
Step 8: HPDU is provided with distinctive HE sign or LI indication;
Step 9: in transmit queue, search whether PDU is arranged SN more than or equal to VT (S), if forward step 10 to, otherwise forward step 12 to;
Step 10: in transmit queue, search SN more than or equal to whether common PDU is arranged among the PDU of VT (S),, otherwise forward step 12 to if forward step 11 to;
Step 11: HPDU is put in the transmit queue before first common PDU according to the order of sequence, and the SN value of moving common PDU after increasing, increasing degree be new insertion transmit queue HPDU number, forwards step 13 to,
Step 12: HPDU is added to the transmit queue afterbody, forwards step 13 to;
Step 13: the SN that HPDU is set;
Step 14; Send each PDU according to the order in the transmit queue, forward step 1 to.
Above-mentioned process of transmitting is a constantly process of circulation along with the continuous transmission of top layer SDU.
Fig. 5 is the performing step that receives HPDU according to technical scheme provided by the present invention at wireless chain control layer:
Step 1:RLC receives the PDU of lower floor, judges this PDU type according to HE sign among the PDU or LI indication, if carry out the processing of common PDU for common PDU, this process repeats no more herein, and flow process finishes; If be HPDU then forward step 2 to;
Step 2: if this PDU is first HPDU, then forward step 3 to, otherwise forward step 4 to;
Step 3: open up the reassembly buffer district that is independent of common PDU;
Step 4: judge whether this HPDU indicates HSDU to finish,, otherwise forward step 8 to if indication HSDU does not finish then forwards step 5 to;
Step 5: judge whether the HPDU before this HPDU all collects,, forward step 1 to if do not collect then this HPDU is suspended to the reception formation; If collected then forwarded step 6 to;
Step 6: whether the data division among this HPDU, judge receiving has continuous HPDU behind this HPDU in the formation if being copied to the individual buffer district, if not then forward step 1 to, otherwise forwards step 7 to;
Step 7: will receive that the data of HPDU copy to the individual buffer district in the formation, and, forward step 1 to if upwards deliver can recombinate SDU then the back of recombinating;
Step 8: judge whether all HPDU of HSDU collect,, deliver, forward step 1 to the upper strata if collect then the HSDU that recombinates; If do not collect then HPDU is suspended to the reception formation, forward step 1 to.
Above-mentioned receiving course is a constantly process of circulation along with the continuous submission of the PDU of lower floor.
Claims (5)
1, a kind of method of wireless link control layer transmitting determination mode intersection-protocol data unit, at transmitting terminal, when receiving the upper-layer service data cell, it is handled through burst, serial connection, filling, the protocol Data Unit that forms specific size sends to the opposite end, and the packet of losing is retransmitted automatically; At receiving terminal, the protocol Data Unit of receiving is reassembled into the upper-layer service data cell deliver to the upper strata; It is characterized in that,
When transmitting terminal is received upper strata high-priority service data cell, this high-priority service data cell is carried out burst, serial connection, filling processing formation intersection-protocol data unit, be inserted into and finish that burst, serial connection, filling are handled but before the protocol Data Unit that do not send as yet, use an expansion type or Length Indication sign intersection-protocol data unit, realize the preferential intersection-protocol data unit that sends;
Receive the lower-layer protocols data cell at receiving terminal, be judged as intersection-protocol data unit according to an expansion type or Length Indication in the protocol Data Unit; Open up buffering in addition, the data in the intersection-protocol data unit are put into this buffering according to an expansion type or Length Indication; All intersection-protocol data units of same upper-layer service data cell are collected, reassemble into the upper-layer service data cell and deliver to the upper strata.
2, the method for wireless link control layer transmitting determination mode intersection-protocol data unit as claimed in claim 1, it is characterized in that, intersection-protocol data unit is inserted in the transmit queue before the common protocol of first behind the send state variable data cell at transmitting terminal, and will originally after the common protocol data cell behind the send state variable, move, the sequence number that is about to the common protocol data cell behind the original send state variable increases, and the amplitude of increase is the number of intersection-protocol data unit.
3, the method for wireless link control layer transmitting determination mode intersection-protocol data unit as claimed in claim 1 or 2, it is characterized in that an expansion type of the protocol Data Unit of affirmation mode is defined as follows when using an expansion type to identify intersection-protocol data unit:
00: the expression subsequent byte is the common protocol data unit data;
01: the expression subsequent byte is indication of common protocol data unit length and extension bits;
10: the expression subsequent byte is the intersection-protocol data unit data;
11: the expression subsequent byte is intersection-protocol data unit Length Indication and extension bits.
4, the method for wireless link control layer transmitting determination mode intersection-protocol data unit as claimed in claim 1 or 2, it is characterized in that the Length Indication of the protocol Data Unit of affirmation mode is defined as follows when using Length Indication sign intersection-protocol data unit:
During the indication of 7 bit lengths, 1111101 these protocol Data Units of expression are intersection-protocol data unit;
During the indication of 15 bit lengths, 111111111111101 these protocol Data Units of expression are intersection-protocol data unit.
5, the method for wireless link control layer transmitting determination mode intersection-protocol data unit as claimed in claim 1 or 2, it is characterized in that the Length Indication of the protocol Data Unit of affirmation mode is defined as follows when using Length Indication sign intersection-protocol data unit:
During the indication of 7 bit lengths, 1111100 these protocol Data Units of expression are intersection-protocol data unit;
During the indication of 15 bit lengths, 111111111111100 these protocol Data Units of expression are intersection-protocol data unit.
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| CN101202604B (en) * | 2007-08-14 | 2011-03-30 | 深圳市同洲电子股份有限公司 | Method for transmitting network data |
| CN101388900B (en) * | 2007-09-12 | 2014-05-28 | 电信科学技术研究院 | Processing method, apparatus and system for protocol data unit filling |
| CN103944684B (en) * | 2014-05-13 | 2016-04-06 | 江苏鑫软图无线技术股份有限公司 | A kind of generation method of AM PDU burst under LTE RLC AM pattern |
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