CN101369879B - Method and apparatus for requesting data retransmission - Google Patents
Method and apparatus for requesting data retransmission Download PDFInfo
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- CN101369879B CN101369879B CN 200710147313 CN200710147313A CN101369879B CN 101369879 B CN101369879 B CN 101369879B CN 200710147313 CN200710147313 CN 200710147313 CN 200710147313 A CN200710147313 A CN 200710147313A CN 101369879 B CN101369879 B CN 101369879B
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Abstract
The invention discloses a method for requesting data retransmission. Firstly a PUD and/or PDU segmentation is received from a transmission terminal; then according to the data reception condition, a state PDU is returned to the transmission terminal, wherein the state PDU comprises one or more receiving data information, the information comprises an extension field with a length of at least two-bit for the information combination of identification data. The invention also discloses a data receiving terminal comprising a data receiving unit, a detection unit and a state PDU generation unit. The method for requesting data retransmission retransmits a plurality of data through the information state PDU with a plurality of data, saves the consumption of the state PDU and improves the system retransmission efficiency.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of method and device of request data retransmission.
Background technology
Along with developing rapidly of wireless communication technology, the user requires increasingly highly to the business data transmission time, and when data receiver receives incorrect data, needs data sending terminal that the data of losing are retransmitted.
Data re-transmission with RLC (Radio Link Control, Radio Link control) layer is an example, in the prior art; The rlc layer of data sending terminal is receiving PDCP (Packet Data Convergence Protocol; Packet data convergence) behind the SDU (Service Data Unit, Service Data Unit) that layer sends, RLC SDU is cut apart and/or cascade generation RLC PDU (Protocol Data Unit; Protocol Data Unit), and with this RLC PDU send to data receiver.All comprise a SN (Sequence Number among each RLC PDU; Sequence number), if this data receiver does not correctly receive this RLC PDU, then send the status PDU of loss of data to data sending terminal; Feed back the SN of this PDU that loses, the request msg transmitting terminal retransmits this PDU; Otherwise send the status PDU of data validation, confirm that said data are received by correct, these data of request receiving terminal deletion, and send new data; After data sending terminal receives above-mentioned status PDU, the PDU of retransmission of lost, the PDU that deletion is identified, and transmit new PDU.During re-transmission, the quantity not sufficient that can transmit when this time need be carried out segmentation to PDU when transmitting a PDU; And each PDU segmentation need be carried SO (Segment Offset; Grading excursion) and LF (Length Field, length field), be used for indicating this position of PDU segmentation in former PDU.If data receiver does not receive this segmentation, then need feed back SN, SO and the LF of this missing segments to data sending terminal transmit status PDU, the request msg transmitting terminal retransmits this segmentation.
The form of the status PDU of prior art is as shown in Figure 1, comprises Type (type) field, SN field, E (Extension, expansion) field, SO field and LF field.Wherein, the type (type of representing this status PDU when for example Type is for NACK is the type of non-affirmation) of this status PDU of the type field indication, whether E field indication back contains SO and LF.
In realizing process of the present invention; The inventor finds to have following problem in the prior art at least: when adopting the form of status PDU of prior art; A status PDU can only be asked the data re-transmission of a data transmitting terminal, as asking a plurality of data re-transmission, then need send a plurality of status PDU; Increase expense, influenced the throughput of system.
Summary of the invention
The problem that the embodiment of the invention will solve provides method and the device that a kind of request of data retransmits, and to use a status PDU request retransmission or to confirm one or more data, saves the expense of status PDU, improves the retransmission efficiency of system.
For achieving the above object, the technical scheme of the embodiment of the invention provides a kind of method of request data retransmission, may further comprise the steps: at first, receive the PDU and/or the PDU segmentation of being sent by transmitting terminal; Then; Receive situation according to PDU and/or PDU segmentation, to transmitting terminal return state PDU, status PDU comprises the information of a plurality of reception data; Comprise in the information that length is at least two extended field E; The information combination that is used for identification data, the information combination of data comprises the SN of a plurality of data, perhaps SN and SO.
The technical scheme of the embodiment of the invention also provides a kind of data receiver, comprises Data Receiving unit, detecting unit and status PDU generation unit; Said Data Receiving unit is used to receive the PDU and/or the PDU segmentation of being sent by transmitting terminal; Said detecting unit is used to detect said Data Receiving unit and whether correctly receives said PDU and/or PDU segmentation; Said status PDU generation unit; Be used for testing result, generate status PDU, and the status PDU that generates is sent to said transmitting terminal according to said detecting unit; Said status PDU comprises the information of a plurality of reception data; Comprise in the information that length is at least two extended field E, be used for the information combination (SN that comprises a plurality of data, perhaps SN and SO) of identification data.
An embodiment in the technique scheme has following advantage: the embodiment of the invention is through a status PDU of carrying one or more data messages; The one or more data of request retransmission; Accelerate the transmission of transmitting terminal data; The throughput of raising system has been saved the expense of status PDU, has improved the retransmission efficiency of system.
Description of drawings
Fig. 1 is the form sketch map of a kind of status PDU of prior art;
Fig. 2 is the flow chart of method of a kind of request data retransmission of the embodiment of the invention;
Fig. 3 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Fig. 4 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Fig. 5 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Fig. 6 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Fig. 7 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Fig. 8 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Fig. 9 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 10 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 11 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 12 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 13 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 14 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 15 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 16 is the form sketch map of a kind of status PDU of the embodiment of the invention;
Figure 17 is the structural representation of a kind of data receiver of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail:
The method flow of a kind of request data retransmission of the embodiment of the invention is as shown in Figure 2, is example with the data re-transmission of rlc layer, and present embodiment may further comprise the steps:
Step s201 receives the PDU and/or the PDU segmentation of being sent by transmitting terminal.
The rlc layer of data sending terminal sends RLC PDU and/or PDU segmentation to receiving terminal, and said receiving terminal receives this RLC PDU and/or PDU segmentation.
Step s202, according to the Data Receiving situation, receiving terminal is to transmitting terminal return state PDU.If this data receiver does not correctly receive this RLC PDU and/or PDU segmentation; Then send non-affirmation status PDU to data sending terminal; The request msg transmitting terminal retransmits this PDU that loses and/or PDU segmentation; Confirm status PDU otherwise send, PDU and/or PDU segmentation that request transmitting terminal deletion receiving terminal has correctly received, and send new data.Wherein, said status PDU comprises the information of one or more reception data, and the information of each data comprises the E field, and the length of this E field is at least two, is used for the information combination of identification data; The information combination of said data comprises the SN of one or more data, perhaps SN and SO; When the PDU that receives was segmented into rear, the information combination of these data also comprised the LF of data.
Being 2 with the E field is example; Form to status PDU describes, and the E field is that 00 expression back is sky in the present embodiment, and the E field is 01 expression followed SN field and E territory; The E field is that the SO field is only followed in 10 expression back, and the E field is that 11 expression back are only with SO field and LF field.
When only needing request retransmission or confirming single PDU, the form of a kind of status PDU of the embodiment of the invention is as shown in Figure 3, comprises the type field, SN field and E field.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation (being loss of data), and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); The SN field is represented the SN of PDU; The E field is that 00 expression back is for empty.
When only needing request retransmission or confirming single PDU segmentation, the form of a kind of status PDU of the embodiment of the invention such as Fig. 4 or shown in Figure 5 comprise the type field, SN field, E field, SO field, can also comprise the LF field.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); The SN field is represented the SN of PDU segmentation; The E field is 11 expression followed SO field and LF fields.If when this is segmented into rear, the E field can be made as 10, and expression back is only with the SO field, and receiving terminal is when receiving this SO, and the data byte that in said SN, is positioned at behind this SO all need retransmit.
When the needs request retransmission or when confirming a plurality of PDU, the form of a kind of status PDU of the embodiment of the invention is as shown in Figure 6, comprises the type field, a plurality of SN field and a plurality of E field.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); Each SN field is represented the SN of PDU respectively; The E field is 01 expression followed SN field and E territory, and the E field is that 00 expression back is for empty.
Present embodiment is through a status PDU of carrying one or more data messages, the one or more data of request retransmission, or confirm one or more data; Accelerate the transmission of transmitting terminal data; The throughput of raising system has been saved the expense of status PDU, has improved the retransmission efficiency of system; And through last segmentation of extended field indication, solved the problem that transmitting terminal can't retransmit last segmentation.
Being 3 with the E field is example, and the form of status PDU is described, and the E field is that 000 expression back is for empty in the present embodiment; The E field is 001 expression followed SN field and E territory; The E field is 010 expression followed SO field and E territory, and the E field is 011 expression followed SO field, LF field and E territory, and the E field is 100 expression followed SN fields, SO field and E territory; The E field is 101 expression followed SN fields, SO field, LF field and E territory, and the E field is 110 to be 111 to reserve with the E field.
When only needing request retransmission or confirming single PDU, the form of a kind of status PDU of the embodiment of the invention is as shown in Figure 7, comprises the type field, SN field and E field.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); The SN field is represented the SN of PDU; The E field is that 000 expression back is for empty.
When the needs request retransmission or when confirming a plurality of PDU, the form of a kind of status PDU of the embodiment of the invention is as shown in Figure 8, comprises the type field, a plurality of SN field and a plurality of E field.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); Each SN field is the SN of PDU respectively; The E field is 001 expression followed SN field and E territory, and the E field is that 000 expression back is for empty.
When the needs request retransmission or when confirming single PDU segmentation, the form of a kind of status PDU of the embodiment of the invention such as Fig. 9 or shown in Figure 10 comprise the type field, SN field, a plurality of E field, SO field and LF field.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); The SN field is represented the SN of PDU; The E field is 011 expression followed SO field, LF field and E territory, and the E field is that 000 expression back is for empty; If when this is segmented into rear, the E field can be made as 010, and expression back is only with SO field and E field, and receiving terminal is when receiving this SO, and the data byte that in said SN, is positioned at behind this SO all need retransmit.
When needs while request retransmission or affirmation PDU and PDU segmentation, the form of a kind of status PDU of the embodiment of the invention comprises the type field, a plurality of SN field, a plurality of E field, SO field and LF field shown in Figure 11 or 12.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); The SN field is represented the SN of PDU; The E field is 101 expression followed SN fields, SO field, LF field and E territory; The E field is that 000 expression back is for empty; If when this is segmented into rear, the E field can be made as 100, and the expression back is only with SN field, SO field and E field; Receiving terminal is when receiving this SO, and the data byte that in said SN, is positioned at behind this SO all need retransmit.
When needing request retransmission or confirm a plurality of PDU segmentation with SN, the form of a kind of status PDU of the embodiment of the invention comprises the type field, SN field, a plurality of E field, SO field and LF field shown in Fig. 13 or 14.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); The SN field is represented the SN of PDU; The E field is 011 expression followed SO field, LF field and E territory; The E field is that 000 expression back is for empty; If when this is segmented into rear, the E field can be made as 010, and the expression back is only with SO field and E field; Receiving terminal is when receiving this SO, and the data byte that in said SN, is positioned at behind this SO all need retransmit.
When needing request retransmission or confirm a plurality of PDU segmentation of different SN, the form of a kind of status PDU of the embodiment of the invention comprises the type field, a plurality of SN field, a plurality of E field, SO field and LF field shown in Figure 15 or 16.Wherein, Type=NACK representes that the type of this status PDU is the type of non-affirmation, and the type that Type=ACK representes this status PDU is for confirming the type of (being that data correctly receive); A plurality of SN fields are represented the SN of PDU respectively; The E field is 101 expression followed SN fields, SO field, LF field and E territory; The E field is that 000 expression back is for empty; If when this is segmented into rear, the E field can be made as 100, and the expression back is only with SN field, SO field and E field; Receiving terminal is when receiving this SO, and the data byte that in said SN, is positioned at behind this SO all need retransmit.
Present embodiment is through a status PDU of carrying one or more data messages, the one or more data of request retransmission, or confirm one or more data; Accelerate the transmission of transmitting terminal data; The throughput of raising system has been saved the expense of status PDU, has improved the retransmission efficiency of system; And through last segmentation of extended field indication, solved the problem that transmitting terminal can't retransmit last segmentation.
Figure 17 is the structural representation of a kind of data receiver of the embodiment of the invention.Comprise Data Receiving unit 171, detecting unit 172 and status PDU generation unit 173, wherein 173 communications are connected detecting unit 172 with the status PDU generation unit with Data Receiving unit 171 respectively.Data Receiving unit 171 is used to receive the PDU that is sent by data sending terminal; Detecting unit 172 is used to detect Data Receiving unit 171 and whether correctly receives said PDU; Status PDU generation unit 173 is used for the testing result according to detecting unit 172, generates status PDU, and the status PDU that generates is sent to the reception data sending terminal.
This status PDU comprises the information of one or more data, and the information of each data comprises the E field, and the length of this E field is at least two, is used for the information combination of identification data; The information combination of these data comprises the SN of one or more data, perhaps SN and SO, and when comprising SO, the information combination of these data can also comprise the LF of data.
Present embodiment is through a status PDU of carrying the information of one or more data, and the one or more data of request retransmission have been saved the expense of status PDU, have improved the retransmission efficiency of system.
And present embodiment has removed the LF field when in status PDU, comprising SO, has solved the problem that can't ask rear to retransmit, and has reduced the expense of status PDU, has improved system's retransmission efficiency, and has improved the throughput of system.
The above only is an execution mode of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (4)
1. the method for a request data retransmission is characterized in that, may further comprise the steps:
Protocol Data Unit PDU and/or PDU segmentation that reception is sent by transmitting terminal;
Reception situation according to said PDU and/or PDU segmentation; To said transmitting terminal return state PDU; Said status PDU comprises the information of a plurality of reception data, comprises in the said information that length is at least two extended field E, is used for the information combination of identification data; The information combination of said data comprises the sequence number SN of a plurality of data, perhaps SN and grading excursion SO.
2. data retransmission method according to claim 1 is characterized in that when the PDU that receives was segmented into rear, the information combination of said data also comprised the length field LF of data.
3. a data receiver is characterized in that, comprises Data Receiving unit, detecting unit and status PDU generation unit,
Said Data Receiving unit is used to receive the PDU and/or the PDU segmentation of being sent by transmitting terminal;
Said detecting unit is used to detect said Data Receiving unit and whether correctly receives said PDU and/or PDU segmentation;
Said status PDU generation unit is used for the testing result according to said detecting unit, generates status PDU; And the status PDU that generates sent to said transmitting terminal; Said status PDU comprises the information of a plurality of reception data, comprises in the said information that length is at least two extended field E, is used for the information combination of identification data; The information combination of said data comprises the SN of a plurality of data, perhaps SN and SO.
4. like the said data receiver of claim 3, it is characterized in that,
The PDU that said Data Receiving unit receives is segmented into rear;
The information combination of data also comprises the length field LF of data in the status PDU that said status PDU generation unit generates.
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| CN201310001978.5A CN103078722B (en) | 2007-08-14 | 2007-08-14 | A kind of method and device of request data retransmission |
| CN 200710147313 CN101369879B (en) | 2007-08-14 | 2007-08-14 | Method and apparatus for requesting data retransmission |
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| CN 200710147313 CN101369879B (en) | 2007-08-14 | 2007-08-14 | Method and apparatus for requesting data retransmission |
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| CN101631353B (en) * | 2009-08-21 | 2011-08-10 | 普天信息技术研究院有限公司 | Method and device for managing status packet data unit |
| CN104518852B (en) * | 2013-09-29 | 2018-06-15 | 普天信息技术研究院有限公司 | A kind of transmission feedback method |
| CN106233653B (en) * | 2014-05-28 | 2019-06-21 | 华为技术有限公司 | A kind of wireless link control transmission method and apparatus |
| CN108024374A (en) * | 2016-11-03 | 2018-05-11 | 电信科学技术研究院 | A kind of method and system for carrying out data sending and receiving |
| SG11201906180XA (en) | 2017-01-04 | 2019-08-27 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Rlc layer status report control pdu transmitting method and related device |
| CN110235416B (en) * | 2017-04-28 | 2023-09-26 | Oppo广东移动通信有限公司 | Method and apparatus for wireless communication, and computer-readable storage medium |
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Application publication date: 20090218 Assignee: Apple Computer, Inc. Assignor: Huawei Technologies Co., Ltd. Contract record no.: 2015990000755 Denomination of invention: Method and device for requesting data retransmission Granted publication date: 20121226 License type: Common License Record date: 20150827 |
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