CN101175017A - Data transmission system and method - Google Patents
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- CN101175017A CN101175017A CNA2006101380179A CN200610138017A CN101175017A CN 101175017 A CN101175017 A CN 101175017A CN A2006101380179 A CNA2006101380179 A CN A2006101380179A CN 200610138017 A CN200610138017 A CN 200610138017A CN 101175017 A CN101175017 A CN 101175017A
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Abstract
The invention discloses a data transmission method and a system in a multilink system. The method includes S102 that a data sending end adds first order numbers which are used for the packet lost detection and the sums recombinant on every sent data packet, adds second order numbers which are used for the packet lost detection on every new sent data packet basing on every link path and sends the data packets to the relative link paths. The method includes S104 is that a first message is sent to a data receiving end when no new data packets are sent. The method also includes S106 that the data receiving end renews the first order numbers used for the data packet lost detection and the sums recombinant on the data receiving end and the second order numbers basing on the packet lost detection of every link path when receiving the first message.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of data transmission system method of unifying.
Background technology
The 3G mobile communication technology is ripe gradually commercial at present, and 3GPP2 CDMA20001XEV-DO can further provide competitive wireless access system in the coming years.But want to remain on following 10 years or the competitiveness in decades, need to introduce new wireless access technology.At present industry has been reached preliminary unanimity (promptly be divided into two stages carry out) with regard to the technology of the eating dishes without rice or wine evolution of 3GPP2: the stage one, adopt the multi-carrier EV-DO technology, and consider compatible more; Stage two, introduce more advanced technology, such as frequency division multiplexing (Orthogonal Frequency Division Multiple, abbreviation OFDM) technology, multiple-input and multiple-output (Multiple-Input Multiple-Output, be called for short MIMO) technology or the like, with spectrum efficiency and the peak rate that improves wireless access system greatly.Technology in stage one is the evolution items of short-term, and the technology in the stage two is the long-term evolution plan of 3GPP2 standard.
Radio link protocol (Radio Link Protocol, be called for short RLP) be to guarantee the grouped data link layer protocol of transmission as possible in the 1XEV-DO system, it is that upper strata (such as the TCP layer) provides more reliable transfer of data, thereby can shield the error burst interference that wireless side is brought.The RLP agreement is a kind of based on the negative response agreement that error detection and data re-transmission are provided of (NegativeAcknowledgement is called for short NAK).When data receiver detects when in the transmission course loss of data being arranged, promptly the data of losing are retransmitted by NAK message request data sending terminal.Wherein, carry the first byte sequence number of obliterated data and the length of obliterated data in the NAK message.
In the RLP agreement (C.S0024) of existing 1xEV-DO realizes, provide a kind of data to submit function to.At the RLP data sending terminal, wait (packet of non-re-transmission) whenever sending new data packets, will start a Flush timer.If before the Flush timer expiry, the RLP transmitting terminal has sent next new data packets, the RLP transmitting terminal Flush timer that will reset then, and restart the Flush timer.If before the RLP transmitting terminal sends next new data packets, the Flush timer expiry, then will to resend sequence number be V (S) to the RLP transmitting terminal
NN-1 packet.
The purpose of doing like this is: if the data flow of certain application has passed, then there is not new data to issue this moment, if some RLP data-bag losts that this moment is last then need data sending terminal that a kind of mechanism is provided, so that data receiver can detect the loss situation of these data this moment.Such as, it is 30000 that the RLP data sending terminal sends the RLP sequence number, 30001,30002,30003 packet, after these packets transmissions are finished, if it is 30000 packet that the RLP receiving terminal is only received the RLP sequence number, 30001,30002 of back, 30003 lose, and that is to say if the RLP transmitting terminal only is V (S) with sequence number
NN-1 packet (be that last sends packet, here be exactly sequence number be 30000 packet) sends to data receiver, and data receiver just can detect 30001,30002,30003 data-bag lost so, thereby can require the opposite end re-transmission.
A kind of typical RLP data packet format is as follows:
| Field (Field) | Length (bits) |
| LinkFlowNumber (link stream number) | 5 |
| Route (route) | 1 |
| SEQ (sequence number) | 6，14or 22 |
| FirstDataUnit (first packet of upper layer packets) | 1 |
| LastDataUnit (last packet of upper layer packets) | 1 |
| Payload (valid data) | Variable (variable) |
Because the RLP data receiver only need know that the RLP data sending terminal sends the sequence number of new data packets for the last time, just can carry out data loss detection, so in Ev-DO agreement (C.S0063-A) afterwards, in order to provide a kind of new means to realize this function, redefined a Flush message.
The form of Flush message is as follows:
| Field | Length(bits) |
| MessageID | 8 |
| LinkFlowNumber | 5 |
| Route | 1 |
| SARSequenceLength | 8 |
| LastSARSequence | SARSequenceLength |
| Reserved | 0-7(as needed) |
Wherein the SARSequenceLength field is represented the length of LastSARSequence sequence number, and promptly the packet sequence number of definition RLP can be 6,14 or 22bits in the agreement.
LastSARSequence then is above-mentioned V (S) NN-1 sequence number, represents the sequence number of the new data packets of last transmission.
Support multicarrier Ev-DO (C.S0024-B) in Ev-DO agreement afterwards, promptly preceding reverse data transmission supports that many carrier links carry out simultaneously.With the forward direction is example, can on many forward links, transmit data simultaneously to the user, because it is separate that the scheduling of different forward links sends, so lose for fast detecting goes out active data, when multilink data transmits, the RLP agreement is carried out certain modification, adopted two-layer sequence number to carry out data loss detection.Wherein the ground floor sequence number is the SAR sequence number, mainly be the sequence number that data sending terminal is cut apart reorganization, is based on whole user's data and flows to line number.Second layer sequence number is the QN sequence number, is based on that every link is numbered, and is mainly used in and detects on every link whether packet loss is arranged.The correlation of SAR and QN is as shown in the table:
Wherein each QN is corresponding to 1 link.Multicarrier RLP realization more specifically can be referring to U.S. Pat 20060187955.
When the forward direction multilink data transmitted, carving at a time needed to send under the situation of flush message, sees also following scene (front is the QN sequence number, and the back is the SAR sequence number):
Link0 Link1 Link2
<1，30> <1，31> <1，32>
<2，33> <2，34> <2，35>
... after the .. data are recovered, continue transmission
<4，40> <4，41>
Data sending terminal is after to send the SAR sequence number be 38 packet, start the Flush timer, if (such as 200 milliseconds) do not have new data packets to send in the certain hour, then data sending terminal sends Flush message, carries the SAR sequence number 38 of the new data packets of last transmission in this message.After data receiver receives Flush message, if find that last new data packets sequence number that data receiver receives is 35, then send repeat requests, the request msg transmitting terminal resends packet 36,37 and 38.But this moment, data receiver did not upgrade the QN sequence number of every link next one new data packets to be received, data receiver thinks that still the QN sequence number of the new bag that the next one of link 0 is to be received is 3, the QN sequence number of the new bag that the next one of link 1 is to be received is 3, and the QN sequence number of the new bag that the next one of link 2 is to be received is 3.If data are recovered over time, then data sending terminal continues to send packet on 3 links, and this moment, data terminal sent SAR bag 39 on link 0, sent SAR bag 40 on link 1, sent SAR bag 41 on link 2.At this moment, the QN sequence number of each new bag is that the QN sequence number of the new data packets next to be sent of preserving according to data sending terminal is numbered.If this moment, packet 39 on the link 0 is lost, then when data receiver is received 40 these new data packets on link 1, because the QN sequence number of receiving on link 1 is discontinuous, thereby cause QN to trigger indication, request SAR sends repeat requests to data sending terminal, and SAR also judges the sequence number 39 that the SAR sequence number of receiving 40 is not the hope receipts, gives data sending terminal so will trigger repeat requests.Processing procedure according to multicarrier RLP, it is on the link 1 loss of data to be arranged that data sending terminal can only be judged, and in fact the data on the link 1 are not lost (lost data packets had before retransmitted by Flush message), thereby cause link 1 erroneous trigger repeat requests.
This shows, need a kind of improved flush processing procedure, with under the multicarrier situation, make the data transmit-receive both sides can upgrade in time, thereby avoid the unnecessary retransmission request based on the data sequence number of every link.
Summary of the invention
At above problem, the invention provides a kind of data transmission system method of unifying.
According to an aspect of the present invention, provide data transmission method in a kind of multilink system.This method comprises: S102, data sending terminal is used for packet loss detection and first sequence number of cutting apart reorganization for the packet increase of each transmission, and,, and on respective links, send described packet for the new data packets increase of each transmission is used for second sequence number of packet loss detection based on every link; S104 under the situation that does not have new data packets to send, is sent to data receiver with first message; And S106, data receiver upgrades data receiver and is used for the data packet loss detection and cuts apart first sequence number of reorganization and second sequence number that detects based on every packet loss of link after receiving described first message.
According to a further aspect in the invention, provide data transmission system in a kind of multilink system.This system comprises: sequence number adding set 202, be positioned at data sending terminal, be used to the packet increase of each transmission to be used for packet loss detection and first sequence number of cutting apart reorganization, and based on every link, for the new data packets increase of each transmission is used for second sequence number of packet loss detection, and on respective links, send packet; Message dispensing device 204 is positioned at data sending terminal, is used under the situation that does not have new data packets to send first message being sent to data receiver; And sequence number updating device 206, be positioned at data receiver, be used for after receiving first message, upgrade data receiver and be used for the data packet loss detection and cut apart first sequence number of reorganization and second sequence number that detects based on every packet loss of link.
Utilize method and system of the present invention, data sending terminal can be used for packet loss detection with one and in time be sent to data receiver with the sequence number of cutting apart reorganization and another signal that is used for loss detection, make data receiver upgrade in time based on the QN sequence number that is used for packet loss detection of every link, thereby avoid the unnecessary retransmission request, save interface-free resources.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to data transmission method of the present invention; And
Fig. 2 is the block diagram according to data transmission system of the present invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
Fig. 1 is the flow chart according to data transmission method of the present invention.As shown in Figure 1, data transmission method of the present invention comprises: S102, data sending terminal is used for packet loss detection and first sequence number of cutting apart reorganization for the packet increase of each transmission, and based on every link, for the new data packets increase of each transmission is used for second sequence number of packet loss detection, and on respective links, send described packet; S104 under the situation that does not have new data packets to send, is sent to data receiver with first message; And S106, data receiver upgrades data receiver and is used for the data packet loss detection and cuts apart first sequence number of reorganization and second sequence number that detects based on every packet loss of link after receiving first message.
Wherein, first sequence number is the sequence number that is used to cut apart reorganization for new data packets and retransmission data packet may increase.Second sequence number is based on every link, is the sequence number that is used for quick packet loss detection of new data packets increase.
Wherein, in step S104, when not having new data packets to send in the scheduled time after sending last new data packets, data sending terminal will send first message to data receiver; Wherein, carry first sequence number of the last new data packets that sends of data sending terminal in first message.Data sending terminal after sending described first message, the second sequence number zero clearing of the next new data packets that on every link, will send data sending terminal.
Wherein, in step S106, data receiver is after receiving first message, the second sequence number zero clearing of data receiver next new data packets to be received on every link.
Wherein, first message further carries second sequence number of last new data packets that data sending terminal sends on every link.
Wherein, in step S106, data receiver is after receiving first message, and second sequence number that second sequence number of data receiver next new data packets to be received on every link is updated to last new data packets that the data sending terminal that carries in first message sends on every link adds 1.
Wherein, based on every link, when not having new data packets to send in the scheduled time after sending last new data packets, data sending terminal will send described first message to data receiver on respective links, wherein carry first sequence number and second sequence number of last new data packets that sends on every link in first message based on every link.
Wherein, in step S106, data receiver is after receiving based on every link first message, second sequence number that second sequence number of data receiver next new data packets to be received on respective links is updated to last new data packets that the data sending terminal that carries in first message sends on every link adds 1, and to upgrade first sequence number that data receiver is used for the data packet loss detection and cuts apart reorganization be that first sequence number of last new data packets of sending of transmitting terminal that first message is carried adds 1.
Fig. 2 is the block diagram according to data transmission system of the present invention.As shown in Figure 2, data transmission system of the present invention comprises: sequence number adding set 202, be positioned at data sending terminal, be used to the packet increase of each transmission to be used for packet loss detection and first sequence number of cutting apart reorganization, and based on every link, for the new data packets increase of each transmission is used for second sequence number of packet loss detection, and on respective links, send described packet; Message dispensing device 204 is positioned at data sending terminal, is used under the situation that does not have new data packets to send first message being sent to data receiver; And sequence number updating device 206, be positioned at data receiver, be used for after receiving first message, upgrade data receiver and be used for the data packet loss detection and cut apart first sequence number of reorganization and second sequence number that detects based on every packet loss of link.
Wherein, first sequence number is the sequence number that is used to cut apart reorganization for new data packets and retransmission data packet may increase.Second sequence number is based on every link, is the sequence number that is used for quick packet loss detection of new data packets increase.
Wherein, when the message dispensing device does not have new data packets to send in the scheduled time after the sequence number adding set sends last new data packets, first message is sent to data receiver; Wherein, carry first sequence number of the last new data packets that sends of data sending terminal in first message.
Wherein, the message dispensing device after sending first message, the second sequence number zero clearing of the next new data packets that on every link, will send the sequence number adding set.
Wherein, the sequence number updating device is after receiving first message, the second sequence number zero clearing of data receiver next new data packets to be received on every link.
Wherein, first message further carries second sequence number of last new data packets that the sequence number adding set sends on every link.
Wherein, the sequence number updating device is after receiving first message, and second sequence number that second sequence number of data receiver next new data packets to be received on every link is updated to last new data packets that the sequence number adding set that carries in first message sends on every link adds 1.
Wherein, based on every link, when not having new data packets to send in the scheduled time after sending last new data packets, information transmitting apparatus will send first message to data receiver on respective links, wherein carry first sequence number and second sequence number of last new data packets that sends on every link in first message based on every link.
Wherein, the sequence number updating device is after receiving based on every link first message, second sequence number that second sequence number of data receiver next new data packets to be received on respective links is updated to last new data packets that the data sending terminal that carries in first message sends on every link adds 1, and to upgrade first sequence number that data receiver is used for the data packet loss detection and cuts apart reorganization be that first sequence number of last new data packets of sending of transmitting terminal that first message is carried adds 1.
Particularly, the invention provides first embodiment.In the concrete scene described in the background technology, when data sending terminal after each flush timer expiry sends flush message, data sending terminal sends the indication that resets to the QN agreement of data sending terminal, and the QN sequence number V (S) of the next new data packets to be sent of QN is resetted; Data receiver after receiving flush message at every turn, and except carrying out original operation, the indication that also transmission resetted is to the QN agreement of data receiver, and the QN sequence number V (R) of the next new data packets to be received of QN is resetted.As described in the concrete scene, data sending terminal wrapped 42 o'clock at the SAR that sends afterwards, the packet of transmission is＜0,42 〉, promptly the QN sequence number is 0, the SAR sequence number is 42; The QN bag sequence number to be received that data receiver QN agreement keeps is 0.At this moment, data receiver QN agreement judges that the QN sequence number is continuous, does not indicate the agreement to SAR so can not trigger QuickNAK redundantly, also can not increase the processing of SAR.
Alternatively, the invention provides second embodiment.In the scene described in the background technology, flush message is carried the QN sequence number of last transmission of every link and the SAR sequence number of last transmission.Such as, if in flush message, carry last QN sequence number that sends and the last SAR sequence number that sends on every link, in the situation of finding to have loss of data, the QN layer of data receiver and SAR layer can upgrade next one sequence number to be received (be that the QN layer can upgrade next one QN sequence number to be received, the SAR layer also can upgrade next one SAR sequence number to be received) respectively.Such as, it is 5 that link0 can upgrade next one QN sequence number to be received, packet＜5 that data sending terminal sends after data are recovered, when 42〉reaching the QN of data receiver, because the QN agreement of data receiver judges that the QN sequence number is continuous, the QN agreement also can not trigger QuickNak mistakenly and indicate to SAR.
Alternatively, the invention provides the 3rd embodiment, in the scene described in the background technology, the process of revising flush is based on each QN example, for each QN (being every link) is provided with the flush timer respectively, when the flush timer expiry, flush message is carried last QN sequence number that sends and the last SAR sequence number that sends on this link.Every link waits to receive the QN sequence number of packet according to the next one of the flush information updating data receiver QN agreement of this link, thereby also can avoid unnecessary QuickNAK indication when data are recovered.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. the data transmission method in the multilink system is characterized in that comprising:
S102, data sending terminal is used for packet loss detection and first sequence number of cutting apart reorganization for the packet increase of each transmission, and,, and on respective links, send described packet for the new data packets increase of each transmission is used for second sequence number of packet loss detection based on every link;
S104 under the situation that does not have new data packets to send, is sent to data receiver with first message; And
S106, data receiver upgrade being used for the data packet loss detection and cutting apart first sequence number of reorganization and second sequence number that detects based on every packet loss of link of described data receiver after receiving described first message.
2. data transmission method according to claim 1 is characterized in that, described first sequence number is the sequence number that is used to cut apart reorganization for new data packets and retransmission data packet may increase.
3. data transmission method according to claim 1 is characterized in that, described second sequence number is based on every link, is the sequence number that is used for quick packet loss detection of new data packets increase.
4. data transmission method according to claim 1, it is characterized in that, in described step S104, when not having new data packets to send in the scheduled time after sending last new data packets, described data sending terminal will send described first message to described data receiver; Wherein, carry first sequence number of the last new data packets that sends of described data sending terminal in described first message.
5. data transmission method according to claim 1, it is characterized in that, in described step S104, described data sending terminal after sending described first message, the second sequence number zero clearing of the next new data packets that on every link, will send described data sending terminal.
6. data transmission method according to claim 1, it is characterized in that, in described step S106, described data receiver is after receiving described first message, the second sequence number zero clearing of described data receiver next new data packets to be received on every link.
7. data transmission method according to claim 4 is characterized in that, described first message further carries second sequence number of last new data packets that described data sending terminal sends on every link.
8. data transmission method according to claim 7, it is characterized in that, in described step S106, described data receiver is after receiving described first message, and second sequence number that second sequence number of described data receiver next new data packets to be received on every link is updated to last new data packets that the data sending terminal that carries in described first message sends on every link adds 1.
9. data transmission method according to claim 4, it is characterized in that, based on every link, when not having new data packets to send in the scheduled time after sending last new data packets, described data sending terminal will send described first message to described data receiver on respective links, wherein carry first sequence number and second sequence number of last new data packets that sends on every link in first message based on every link.
10. data transmission method according to claim 9, it is characterized in that, in described step S106, described data receiver receive described based on every link first message after, second sequence number that second sequence number of described data receiver next new data packets to be received on respective links is updated to last new data packets that the described data sending terminal that carries in described first message sends on every link adds 1, and to upgrade first sequence number that described data receiver is used for the data packet loss detection and cuts apart reorganization be that first sequence number of last new data packets of sending of transmitting terminal that described first message is carried adds 1.
11. the data transmission system in the multilink system is characterized in that comprising:
The sequence number adding set, be positioned at data sending terminal, be used to the packet increase of each transmission to be used for packet loss detection and first sequence number of cutting apart reorganization, and based on every link, for the new data packets increase of each transmission is used for second sequence number of packet loss detection, and on respective links, send described packet;
The message dispensing device is positioned at described data sending terminal, is used under the situation that does not have new data packets to send first message being sent to data receiver; And
The sequence number updating device is positioned at described data receiver, is used for after receiving described first message, upgrades described data receiver and is used for the data packet loss detection and cuts apart first sequence number of reorganization and second sequence number that detects based on every packet loss of link.
12. data transmission system according to claim 11 is characterized in that, described first sequence number is the sequence number that is used to cut apart reorganization for new data packets and retransmission data packet may increase.
13. data transmission system according to claim 11 is characterized in that, described second sequence number is based on every link, is the sequence number that is used for quick packet loss detection of new data packets increase.
14. data transmission system according to claim 11, it is characterized in that, when described message dispensing device does not have new data packets to send in the scheduled time after described sequence number adding set sends last new data packets, described first message is sent to described data receiver; Wherein, carry first sequence number of the last new data packets that sends of described data sending terminal in described first message.
15. data transmission system according to claim 11 is characterized in that, described message dispensing device after sending described first message, the second sequence number zero clearing of the next new data packets that on every link, will send described sequence number adding set.
16. data transmission system according to claim 11 is characterized in that, described sequence number updating device is after receiving described first message, the second sequence number zero clearing of described data receiver next new data packets to be received on every link.
17. data transmission system according to claim 14 is characterized in that, described first message further carries second sequence number of last new data packets that described sequence number adding set sends on every link.
18. data transmission system according to claim 17, it is characterized in that, described sequence number updating device is after receiving described first message, and second sequence number that second sequence number of described data receiver next new data packets to be received on every link is updated to last new data packets that the described sequence number adding set that carries in described first message sends on every link adds 1.
19. data transmission system according to claim 14, it is characterized in that, based on every link, when not having new data packets to send in the scheduled time after sending last new data packets, described information transmitting apparatus will send described first message to described data receiver on respective links, wherein carry first sequence number and second sequence number of last new data packets that sends on every link in first message based on every link.
20. data transmission system according to claim 19, it is characterized in that, described sequence number updating device receive described based on every link first message after, second sequence number that second sequence number of described data receiver next new data packets to be received on respective links is updated to last new data packets that the described data sending terminal that carries in described first message sends on every link adds 1, and to upgrade first sequence number that described data receiver is used for the data packet loss detection and cuts apart reorganization be that first sequence number of last new data packets of sending of transmitting terminal that described first message is carried adds 1.
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| CN107124253A (en) * | 2016-02-25 | 2017-09-01 | 中兴通讯股份有限公司 | Data repeating method and device based on DVB-RCS systems |
| CN109842856A (en) * | 2017-11-29 | 2019-06-04 | 成都鼎桥通信技术有限公司 | A kind of method and apparatus shielding uplink packet loss |
| CN110138629A (en) * | 2018-02-02 | 2019-08-16 | 中兴通讯股份有限公司 | Detection method and device, storage medium and the processor of packet loss of link |
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