CN103095410A - Rail communication error control method - Google Patents
Rail communication error control method Download PDFInfo
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- CN103095410A CN103095410A CN2013100071676A CN201310007167A CN103095410A CN 103095410 A CN103095410 A CN 103095410A CN 2013100071676 A CN2013100071676 A CN 2013100071676A CN 201310007167 A CN201310007167 A CN 201310007167A CN 103095410 A CN103095410 A CN 103095410A
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Abstract
The invention discloses a rail communication error control method. In wireless communication of rail transit, the maximum number of retransmission at a certain position begins to be reduced, and error packets transmitted later and data packets still not confirmed before switching are saved simultaneously. After connected to a target area, the packets are retransmitted by a target eNB, and then combined to be decoded. Compared with the prior art, in the method, consideration is given to special communication scenes of railway environments, and transmission performance of switching of overlap areas can be improved. Besides, the problem how to deal with the data packets which are not confirmed before switching when a switching command collides with HARQ (Hybrid Automatic Repeat Request) retransmission is solved, and the method has the advantages of being low in degree of complexity, high in efficiency and easy to implement.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to error control method and the system of a kind of lifting rail road traffic wireless communication transmissions reliability under high-speed mobile environment.
Background technology
The LTE system will become one of candidate technologies of track traffic wireless communication system of future generation with its significant high data rate and lower Time Delay of Systems.In order to overcome the impact that transmission brings on signal of wireless channel time-varying characteristics and multipath fading, reduce the probability of signal bust this, the LTE network using mixed automatic retransfer request HARQ (Hybrid Automatic Repeat reQuest) error control transmission technology.Roughly implementation procedure is as follows: at first, transmitting terminal carries out sending after forward error correction coding to the information source data, and receiving terminal is decoded to the Frame that receives by decoding FEC; If decoding is correct, to transmitting terminal feedback acknowledgment ACK (Acknowledgement); Otherwise, to transmitting terminal feedback Negative Acknowledgement NACK (Negative Acknowledge).Afterwards, transmitting terminal receives the ACK/NACK information of receiving terminal feedback, if ACK carries out lower data transfer; Retransmit if NACK starts ARQ, retransmit the Frame of decoding FEC mistake.At last, receiving terminal will according to different retransmission mechanism, be taked to carry out decoding FEC after independent decoding FEC retransmitting data frame, merging retransmitting data frame again.
The track traffic particularly high-speed mobile of bullet train will cause the Doppler effect of radio communication, it makes channel present rapid fading on time domain, this will make the HARQ technology face larger hydraulic performance decline, especially switching the overlay region, the signal strength signal intensity that receives on the one hand more and more a little less than, Signal to Interference plus Noise Ratio is more and more lower; On the other hand, when switching command conflicted with the HARQ re-transmission, UE can't because of carrying out switching will for source eNB (evolved base station) transmission HARQ re-transmission or ACK/NACK confirmation and delay, cause hydraulic performance decline particularly serious.And the track radio communication requires more reliable communication link, with guarantee driving safety.Therefore, provide the highly reliable error-control technique that is applicable to the track traffic radio communication to have very important significance.
By the retrieval discovery to existing patent and correlation technique, the existing method and system relevant to LTE HARQ technology comprises:
(1) apparatus and method (CN102412938) of a kind of LTE rate de-matching and HARQ merging are loaded down with trivial details for the recovery implementation procedure of sub-block interleaver matrix for speed matching method of the prior art, the larger memory space problem of buffer memory consumption has provided a kind of new LTE rate de-matching and the apparatus and method of HARQ merging.
(2) a kind of HARQ combiner and HARQ date storage method (CN102208966A) memory this problem greatly sometimes of making the vicious packets of information of receiving terminal storage institute for the technology of this two-forty of LTE and a plurality of HARQ processes, a kind of HARQ combiner and HARQ date storage method are provided, have reduced area and the power consumption of baseband chip.
(3) sending method of downlink data and device (CN102571662A) disclose a kind of sending method and base station of downlink data.Be mainly used in solving in existing TD-LTE system that in descending pilot frequency time slot (Downlink Pilot Time Slot, DwPTS), the downlink data of transmission takies the HARQ process and causes the larger problem of sub-frame of uplink load.
(4) system and method (CN102148676A) of realizing of descending HARQ has provided the system and method for realizing of a kind of descending HARQ, this system comprises scheduler module, state machine maintenance module and replys processing module, by the different conditions of the state-chain-table in state machine storage HARQ process, effectively guarantee the reliability of descending HARQ transfer of data in TD-LTE system and ageing.
Still do not have in existing patent clearly for the method that improves track traffic radio communication HARQ transmission performance.
Summary of the invention
In view of the deficiency of the existing program of above statement, the present invention aims to provide the method and system that strengthens switch area HARQ transmission performance under a kind of track traffic radio communication scene, and makes it to overcome the above shortcoming of prior art.
To achieve these goals, technical solution of the present invention is:
A kind of rail communication error control method, be used for improving the particularly communications performance of the high-speed mobile of bullet train of track traffic, communication scenes is based on the LTE network architecture, be comprised of under banded radio communication topological environmental evolved base station eNB, vehicle-mounted relaying and the corresponding interface, place along railway line the base station; Whole communication system Access Network partly is divided into communication and train-ground communication two parts in car, communications portion can be installed femto base station or WiFi radio reception device in every joint compartment in car, user profile converges to vehicle-mounted relaying by this device processes, and the train-ground communication part is comprised of vehicle-mounted relaying and base station, side, road; Comprise following processing means:
(1) according to train status information (position and speed), source eNB judges whether train drives to a certain specific position P1 of overlay region, base station, if arrive, revise media access control MAC layer configuration parameter by radio resource control layer RRC signaling, reduce maximum retransmission;
(2) before base station triggers is switched, source eNB will get up less than the data buffer storage that success is transmitted, and the user also will be cached less than the misdata that success receives, and the grouping of buffer memory is sorted;
(3) in case base station triggers is switched, and the user stops sending ACK/NACK information to source eNB, buffer memory and sequence simultaneously do not send the grouping of ACK/NACK, and source eNB also will confiscate the packet sequencing buffer memory of ACK/NACK information.
(4) in handoff procedure, source eNB is by X2 interface, i.e. interface between source eNB and adjacent cell target eNB, with the packet forward pass of step (2) and (3) described buffer memory to target eNB; And these forwarding data bags are done a mark, to facilitate target eNB identification;
(5) complete switch the access Target cell after, it is P1 point value before that system's maximum retransmission reverts to original value; Target eNB first sends to Vehicle mounted station step (4) the data obtained bag that turns over before X2 interface, to guarantee that packet transmits according to the order of sequence;
(6) after the user receives (5) described data, check whether successfully receive in the cell-of-origin, check that namely whether this bag is to switch before future must reach the correct bag of confirming, if so, directly abandons; If not, more whether verification make mistakes, if quite right, just submits to the upper strata, if make mistakes, merges the solution code check with the corresponding data bag of preserving before switching.
The present invention proposes the method and system that strengthens switch area HARQ transmission performance in a kind of track traffic radio communication, take to begin to reduce maximum retransmission at a certain location point, after preserving simultaneously, the erroneous packets of transmission and switching before future must reach the packet of confirming, retransmitted by target eNB again after Target cell to be accessed, and then merge decoding.Compared with prior art, the method and system have considered the communication scenes that orbital environment is special, can promote the transmission performance of switching the overlay region, and before having solved switching command and how the HARQ re-transmission processes switching when conflicting, those do not have the packet problem of confirmation, have advantages of that complexity is low, efficient is high, exploitativeness is strong.
Description of drawings is as follows:
Fig. 1 is that Fig. 1 of the present invention is the communication scenes schematic diagram.
Fig. 2 is for strengthening switch area HARQ transmission performance method schematic diagram.
Fig. 3 is that RRC connects the reconfiguration course schematic diagram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Promote the method and system that switches overlay region HARQ transmission performance in the track traffic radio communication, it is applicable to track traffic environment (common railway, high-speed railway, heavy haul railway, urban light rail and subway) or banded radio communication topological environmental (also comprising highway) based on the LTE network.Communication scenes as shown in Figure 1.It specifically comprises:
(1) in Fig. 1,11 is rail, and 12 is other base station (eNB), and 14 is vehicle-mounted relaying.Wherein, 12 downlines are placed, and 14 are positioned on train.User herein refers to be positioned at train by the terminal equipment of vehicle-mounted relaying and ground communication, as passenger's mobile phone.
(2) whole communication system Access Network partly is divided into communication and train-ground communication two parts in car.Fig. 1 is the train-ground communication part, is comprised of vehicle-mounted relaying and base station, side, road.Communications portion can be installed the radio reception devices such as femto base station or WiFi in every joint compartment in car, and user profile converges to vehicle-mounted relaying by the processing of this equipment.
(3) this communication scenes also comprises the corresponding interface between each network entity, as X2 interface.
The enforcement of method of the present invention comprises following steps:
1 according to train status information (position and speed), judges whether train drives to a certain specific position of overlay region (be called the P1 point, as shown in Figure 2, i.e. a certain position before switchover trigger point P2, its occurrence can be determined according to engineering measurement).If arrive, revise MAC layer configuration parameter by layer 3RRC signaling, reduce maximum retransmission (as being reduced to 1 from 3).
(2) before triggering switching, eNB will get up less than the data buffer storage that success is transmitted, and the user also will be cached less than the misdata that success receives, and all will sort to the grouping of buffer memory.
(3) in a single day triggering is switched, and the user stops sending ACK/NACK information to eNB, and buffer memory also sorts and do not send the grouping of ACK/NACK simultaneously, and source eNB also will confiscate the packet sequencing buffer memory of ACK/NACK information.
(4) in handoff procedure, source eNB by X2 interface (being the interface between source eNB and adjacent cell target eNB) with the packet forward pass of these buffer memorys to target eNB.These forwarding data bags are done a mark, and this is in order to facilitate target eNB identification.
(5) train is completed switching, and after the access Target cell, system's maximum retransmission reverts to original value (value before the P1 point).Target eNB first sends the data that turn over before X2 interface, and this is in order to guarantee that packet transmits according to the order of sequence.To being with markd forwarding data bag, when target eNB is handed down to Vehicle mounted station, with its wireless network indicate RNTI be revised as the same with source eNB, the phenomenon of having avoided like this user misdata bag of buffer memory before switching and the packet that receives in target eNB can't be merged.
(6) user checks whether successfully receive in the cell-of-origin after receiving these data, checks that namely whether this bag is to switch before future must reach the correct bag of confirming, if so, directly abandons; If not, more whether verification make mistakes, if quite right, just submits to the upper strata, if make mistakes, merges the solution code check with the corresponding data bag of preserving before switching.
The inventive method comprises the improvement of traditional switch area HARQ transmission mechanism:
(1) when Signal to Interference plus Noise Ratio is down to threshold value P1 point, revise MAC layer configuration ginseng by layer 3RRC signaling
Number.
(2) eNB will not send successful, and the packet number consecutively sequence buffer memory of not receiving confirmation before switching, the user is to the erroneous packets that receives and switch before future and must reach the packet that sends confirmation and do same processing.
(3) during to the target eNB forwarding data, do a mark to packet at source eNB, when target eNB is received this packet, and be handed down to when switching the Vehicle mounted station of coming, its wireless network is indicated RNTI be revised as the same with source eNB.
In step (1), corresponding signaling is: eNB sends the RRC connection to the user and reshuffles signaling, carries MAC layer parameter configuration information content in this signaling, revises this parameter of MAC layer HARQ maximum retransmission and gets final product.Reciprocal process as shown in Figure 3.
Adopting basic scheme of the present invention, when reality is implemented, can derive multiple different equivalent product, is technical scheme and inventive concept thereof according to invention in every case, is equal to replace and change, and all is considered to belong to the protection range of the claim of invention.
Claims (2)
1. rail communication error control method, be used for improving the particularly wireless communication transmissions performance of the high-speed mobile of bullet train of track traffic, communication scenes is based on the LTE network architecture, be comprised of under banded radio communication topological environmental evolved base station eNB, vehicle-mounted relaying and the corresponding interface, place along railway line the base station; Whole communication system Access Network partly is divided into communication and train-ground communication two parts in car, communications portion can be installed femto base station or WiFi radio reception device in every joint compartment in car, user profile converges to vehicle-mounted relaying by this device processes, and the train-ground communication part is comprised of vehicle-mounted relaying and base station, side, road; Comprise following processing means:
(1) according to train status information, source eNB judges whether train drives to a certain specific position P1 of overlay region, base station, if arrive, revises media access control MAC layer configuration parameter by radio resource control layer RRC signaling, reduces maximum retransmission;
(2) before base station triggers is switched, source eNB will get up less than the data buffer storage that success is transmitted, and the user also will be cached less than the misdata that success receives, and the grouping of buffer memory is sorted;
(3) in case base station triggers is switched, and the user stops sending ACK/NACK information to source eNB, buffer memory and sequence simultaneously do not send the grouping of ACK/NACK, and source eNB also will confiscate the packet sequencing buffer memory of ACK/NACK information;
(4) in handoff procedure, source eNB is by X2 interface, i.e. interface between source eNB and adjacent cell target eNB, with the packet forward pass of step (2) and (3) described buffer memory to target eNB; And these forwarding data bags are done a mark, to facilitate target eNB identification;
(5) complete switch the access Target cell after, it is P1 point value before that system's maximum retransmission reverts to original value; Target eNB first sends to Vehicle mounted station step (4) the data obtained bag that turns over before X2 interface, to guarantee that packet transmits according to the order of sequence;
(6) after the user receives (5) described data, check whether successfully receive in the cell-of-origin, check that namely whether this bag is to switch before future must reach the correct bag of confirming, if so, directly abandons; If not, more whether verification make mistakes, if quite right, just submits to the upper strata, if make mistakes, merges the solution code check with the corresponding data bag of preserving before switching.
2. rail communication error control method according to claim 1, it is characterized in that, in step (5), when target eNB is handed down to Vehicle mounted station, to being with markd forwarding data bag, with its wireless network indicate RNTI be revised as the same with source eNB, with the phenomenon of avoiding the user misdata bag of buffer memory before switching and the packet that receives in target eNB can't be merged.
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Cited By (5)
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| CN104580340A (en) * | 2014-07-11 | 2015-04-29 | 深圳市金溢科技股份有限公司 | Data updating system and data updating method thereof, as well as mobile multimedia relay equipment |
| CN104717718A (en) * | 2015-03-31 | 2015-06-17 | 杭州祥声通讯股份有限公司 | Method and system for controlling WiFi hotspot communication of high-speed train |
| CN107306149A (en) * | 2016-04-19 | 2017-10-31 | 航迅信息技术有限公司 | A kind of air communications method and system |
| CN107431967A (en) * | 2015-06-03 | 2017-12-01 | 日立建机株式会社 | Wireless communication system, regulatory service device and base station switching action control method |
| CN110557974A (en) * | 2017-04-20 | 2019-12-10 | 住友电气工业株式会社 | In-vehicle communication system, in-vehicle device, communication control method, and communication control program |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580340A (en) * | 2014-07-11 | 2015-04-29 | 深圳市金溢科技股份有限公司 | Data updating system and data updating method thereof, as well as mobile multimedia relay equipment |
| CN104717718A (en) * | 2015-03-31 | 2015-06-17 | 杭州祥声通讯股份有限公司 | Method and system for controlling WiFi hotspot communication of high-speed train |
| CN104717718B (en) * | 2015-03-31 | 2019-11-05 | 杭州祥声通讯股份有限公司 | A kind of high-speed rail train Wi-Fi hotspot communication control method and system |
| CN107431967A (en) * | 2015-06-03 | 2017-12-01 | 日立建机株式会社 | Wireless communication system, regulatory service device and base station switching action control method |
| CN107431967B (en) * | 2015-06-03 | 2020-06-23 | 日立建机株式会社 | Wireless communication system, control server, and base station switching operation control method |
| CN107306149A (en) * | 2016-04-19 | 2017-10-31 | 航迅信息技术有限公司 | A kind of air communications method and system |
| CN107306149B (en) * | 2016-04-19 | 2020-06-26 | 航迅信息技术有限公司 | Aviation communication method and system |
| CN110557974A (en) * | 2017-04-20 | 2019-12-10 | 住友电气工业株式会社 | In-vehicle communication system, in-vehicle device, communication control method, and communication control program |
| CN110557974B (en) * | 2017-04-20 | 2022-04-05 | 住友电气工业株式会社 | In-vehicle communication system, in-vehicle device, communication control method, and communication control program |
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