CN103095410B - A kind of rail communication error control method - Google Patents
A kind of rail communication error control method Download PDFInfo
- Publication number
- CN103095410B CN103095410B CN201310007167.6A CN201310007167A CN103095410B CN 103095410 B CN103095410 B CN 103095410B CN 201310007167 A CN201310007167 A CN 201310007167A CN 103095410 B CN103095410 B CN 103095410B
- Authority
- CN
- China
- Prior art keywords
- communication
- base station
- enb
- packet
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a kind of rail communication error control method, take to start to reduce maximum retransmission at a certain location point in track traffic radio communication, the packet that the erroneous packets of transmission after simultaneously preserving and switching before future obtain and confirm, retransmitted by target eNB again behind Target cell to be accessed, and then merge decoding.Compared with prior art, contemplated by the invention the communication scenes that Railway Environment is special, the transmission performance switching overlay region can be promoted, and how to process when solving switching command and HARQ retransmission collisions switch before those packet problems do not confirmed, there is the advantage that complexity is low, efficiency is high, exploitativeness is strong.
Description
Technical field
The present invention relates to wireless communication field, a kind of error control method of lifting rail road traffic wireless communication transmissions reliability and system under particularly relating to high-speed mobile environment.
Background technology
LTE system, with its significant high data rate and lower Time Delay of Systems, will become one of candidate technologies of track traffic wireless communication system of future generation.In order to overcome the impact that wireless channel time-varying characteristics and multipath fading bring Signal transmissions, reduce the probability of Signal transmissions failure, LTE network have employed hybrid automatic repeat-request HARQ (HybridAutomaticRepeatreQuest) error control transmission technology.Roughly implementation procedure is as follows: first, and transmitting terminal sends after carrying out forward error correction coding to information source data, and receiving terminal is decoded to the Frame received by decoding FEC; If decoding is correct, then to transmitting terminal feedback acknowledgment ACK (Acknowledgement); Otherwise, to transmitting terminal feedback Negative Acknowledgement NACK (NegativeAcknowledge).Afterwards, transmitting terminal receives the ACK/NACK information of receiving terminal feedback, if ACK, then carries out lower data transfer; Retransmit if NACK then starts ARQ, retransmit the Frame of decoding FEC mistake.Finally, receiving terminal, by according to different retransmission mechanism, carries out decoding FEC after taking independent decoding FEC retransmitting data frame, merging retransmitting data frame again.
The high-speed mobile of track traffic particularly bullet train will cause the Doppler effect of radio communication, in time domain, it makes channel present rapid fading, this faces larger hydraulic performance decline by making HARQ technology, especially in switching overlay region, the signal strength signal intensity received on the one hand is more and more weak, and Signal to Interference plus Noise Ratio is more and more lower; On the other hand, when switching command and HARQ retransmission collisions, UE can't send HARQ re-transmission because of giving source eNB (evolved base station) or ACK/NACK confirms and postpones to perform switching, causes hydraulic performance decline particularly serious.And track radio communication requires more reliable communication link, with guarantee driving safety.Therefore, the highly reliable error-control technique being applicable to track traffic radio communication is provided to have very important significance.
By finding the retrieval of existing patent and correlation technique, the existing method and system relevant to LTEHARQ technology comprises:
(1) apparatus and method (CN102412938) that merge of a kind of LTE rate de-matching and HARQ 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, gives the apparatus and method that a kind of new LTE rate de-matching and HARQ merge.
(2) a kind of HARQ combiner and HARQ data storage means (CN102208966A) for the technology of this two-forty of LTE and multiple HARQ process receiving terminal is stored memory this problem comparatively large sometimes of vicious packets of information, provide a kind of HARQ combiner and HARQ data storage means, reduce 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.The downlink data being mainly used in solving transmission in descending pilot frequency time slot (DownlinkPilotTimeSlot, DwPTS) in existing TD-LTE system takies HARQ process and causes the larger problem of sub-frame of uplink load.
(4) descending HARQ realize that system and method (CN102148676A) gives a kind of descending HARQ realize system and method, this system comprises scheduler module, state machine maintenance module and replys processing module, stored the different conditions of HARQ process by state-chain-table in state machine, effectively ensure reliability that in TD-LTE system, descending HARQ data is transmitted and ageing.
The clear and definite method for improving track traffic radio communication HARQ transmission performance is not still had in existing patent.
Summary of the invention
In view of the deficiency of the existing program of above statement, the present invention strengthens the method and system of switch area HARQ transmission performance under aiming to provide a kind of track traffic radio communication scene, and makes it the above shortcoming overcoming prior art.
To achieve these goals, technical solution of the present invention is:
A kind of rail communication error control method, for improving the communications performance in the high-speed mobile of track traffic particularly bullet train, communication scenes is based on LTE network framework, be made up of under banded radio communication topological environmental evolved base station eNB, vehicle-mounted relaying and the corresponding interface, base station is placed along railway line; Whole communication system Access Network part is divided into communication and train-ground communication two parts in car, in car, communications portion can install femto base station or WiFi radio reception device often saving in compartment, user profile converges to vehicle-mounted relaying by this device processes, and train-ground communication part is made up of the other base station of vehicle-mounted relaying and road; Comprise following process 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 arrived, by radio resource control layer RRC signaling amendment media access control MAC layer configuration parameter, reduce maximum retransmission;
(2) before base station triggers switches, source eNB will not have the data buffer storage of Successful transmissions, and the misdata that success does not receive also is cached by user, and sorts to the grouping of buffer memory;
(3) once base station triggers switches, user then stops sending ACK/NACK information to source 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 is by X2 interface, and the interface namely between source eNB and adjacent cell target eNB, by the packet forward pass of step (2) and (3) described buffer memory to target eNB; And a mark is done, to facilitate target eNB identification to these forwarding data bags;
(5), after completing switching access Target cell, system maximum retransmission reverts to the value before original value and P1 point; Step (4) the data obtained bag that target eNB first turns over before Vehicle mounted station transmission X2 interface, to ensure that packet transmits according to the order of sequence;
(6) after user receives (5) described data, check whether and successfully receive in cell-of-origin, namely check whether this bag is the correct bag that switching before future obtains and confirms, if so, directly abandons; If not, then verify and whether make mistakes, if quite right, just submit to upper strata, if made mistakes, carry out mergings solution code check with the corresponding data bag preserved before switching.
The present invention proposes the method and system strengthening switch area HARQ transmission performance in a kind of track traffic radio communication, take to start to reduce maximum retransmission at a certain location point, the packet that the erroneous packets of transmission after simultaneously preserving and switching before future obtain and confirm, retransmitted by target eNB again behind Target cell to be accessed, and then merge decoding.Compared with prior art, the method and system consider the special communication scenes of orbital environment, the transmission performance switching overlay region can be promoted, and how to process when solving switching command and HARQ retransmission collisions switch before those packet problems do not confirmed, there is the advantage that complexity is low, efficiency is high, exploitativeness is strong.
Accompanying drawing is described as follows:
Fig. 1 is Fig. 1 of the present invention is communication scenes schematic diagram.
Fig. 2 is for strengthening switch area HARQ transmission performance methodology schematic diagram.
Fig. 3 is that RRC connects reconfiguration course schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Promote the method and system switching overlay region HARQ transmission performance in track traffic radio communication, it is based on LTE network, 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).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 the terminal equipment of train by vehicle-mounted relaying and ground communication, as the mobile phone of passenger.
(2) whole communication system Access Network part is divided into communication and train-ground communication two parts in car.Fig. 1 is train-ground communication part, is made up of the other base station of vehicle-mounted relaying and road.In car, communications portion can install the radio reception device such as femto base station or WiFi often saving in compartment, and user profile converges to vehicle-mounted relaying by the process 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), judge that a certain specific position whether train drives to overlay region (is called P1 point, as shown in Figure 2, a certain position namely before switchover trigger point P2, its occurrence can be determined according to engineering measurement).If arrived, by layer 3RRC signaling modification of mac layer configuration parameter, reduce maximum retransmission (as being reduced to 1 from 3).
(2) before triggering switches, eNB will not have the data buffer storage of Successful transmissions, and the misdata that success does not receive also is cached by user, and all will sort to the grouping of buffer memory.
(3) once triggering switches, user then 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 passes through X2 interface (interface namely between source eNB and adjacent cell target eNB) by the packet forward pass of these buffer memorys to target eNB.Do a mark to these forwarding data bags, this is conveniently target eNB identification.
(5) train completes switching, and behind access Target cell, system maximum retransmission reverts to original value (value before P1 point).The data that target eNB turns over before first sending X2 interface, this is to ensure that packet transmits according to the order of sequence.To the markd forwarding data bag of band, when target eNB is handed down to Vehicle mounted station, its wireless network is indicated RNTI to be revised as the same with source eNB, this avoid the phenomenon that the misdata bag of buffer memory before switching and the packet received in target eNB cannot carry out merging by user.
(6) user checks whether after receiving these data and successfully receives in cell-of-origin, namely checks whether this bag is the correct bag that switching before future obtains and confirms, if so, directly abandons; If not, then verify and whether make mistakes, if quite right, just submit to upper strata, if made mistakes, carry out mergings solution code check with the corresponding data bag preserved before switching.
The improvement of the inventive method to traditional switch area HARQ transmission mechanism comprises:
(1) when Signal to Interference plus Noise Ratio is down to threshold value P1 point, by layer 3RRC signaling modification of mac layer configuration parameter.
(2) eNB will not send successfully, and not receive the packet number consecutively order buffer of confirmation before switching, and user does same process to the packet that the erroneous packets received and switching before future obtained and sent confirmation.
(3) when source eNB is to target eNB forwarding data, do a mark to packet, when target eNB receives this packet, and when being handed down to the Vehicle mounted station switching and come, its wireless network is indicated RNTI and is revised as the same with source eNB.
In step (1), corresponding signaling is: eNB sends RRC connection to user and reshuffles signaling, carries MAC layer parameter configuration content, this parameter of modification of mac layer HARQ maximum retransmission in this signaling.Reciprocal process as shown in Figure 3.
Adopt basic scheme of the present invention, when reality is implemented, multiple different equivalent product can be derived, as long as be the technical scheme according to invention and inventive concept thereof, be equal to and replace and change, be all considered to belong to the protection range of the claim of invention.
Claims (2)
1. a rail communication error control method, for improving the wireless communication transmissions performance in the high-speed mobile of track traffic bullet train, communication scenes is based on LTE network framework, be made up of under banded radio communication topological environmental evolved base station eNB, vehicle-mounted relaying and the corresponding interface, base station is placed along railway line; Whole communication system Access Network part is divided into communication and train-ground communication two parts in car, in car, communications portion can install femto base station or WiFi radio reception device often saving in compartment, user profile converges to vehicle-mounted relaying by this femto base station or the process of WiFi radio reception device, and train-ground communication part is made up of the other base station of vehicle-mounted relaying and road; Comprise following process 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 arrived, by radio resource control layer RRC signaling amendment media access control MAC layer configuration parameter, reduces maximum retransmission;
(2) before base station triggers switches, source eNB will not have the data buffer storage of Successful transmissions, and the misdata that success does not receive also is cached by user, and sorts to the grouping of buffer memory;
(3), once base station triggers switches, user then stops sending ACK/NACK information to source 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 is by X2 interface, and the interface namely between source eNB and adjacent cell target eNB, by the packet forward pass of step (2) and (3) described buffer memory to target eNB; And a mark is done, to facilitate target eNB identification to these forward data bags;
(5) complete after switching access Target cell, system maximum retransmission reverts to the value before original value and P1 point; First step (4) the data obtained bag of coming to Vehicle mounted station transmission X2 interface forward pass of target eNB, to ensure that packet transmits according to the order of sequence;
(6) after user receives (5) described packet, check whether and successfully receive in cell-of-origin, namely check whether this bag is the correct bag that switching before future obtains and confirms, if so, directly abandons; If not, then verify and whether make mistakes, if quite right, just submit to upper strata, if made mistakes, carry out mergings solution code check with the corresponding data bag preserved 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 the markd forward data bag of band, its wireless network is indicated RNTI to be revised as the same with source eNB, the misdata bag of buffer memory before switching and the packet received in target eNB cannot be carried out the phenomenon merged to avoid user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007167.6A CN103095410B (en) | 2013-01-09 | 2013-01-09 | A kind of rail communication error control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007167.6A CN103095410B (en) | 2013-01-09 | 2013-01-09 | A kind of rail communication error control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103095410A CN103095410A (en) | 2013-05-08 |
| CN103095410B true CN103095410B (en) | 2016-03-23 |
Family
ID=48207589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310007167.6A Expired - Fee Related CN103095410B (en) | 2013-01-09 | 2013-01-09 | A kind of rail communication error control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103095410B (en) |
Families Citing this family (5)
| 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 |
| 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 |
| JP6539502B2 (en) * | 2015-06-03 | 2019-07-03 | 日立建機株式会社 | Wireless communication system, control server, and base station switching operation control method |
| CN107306149B (en) * | 2016-04-19 | 2020-06-26 | 航迅信息技术有限公司 | Aviation communication method and system |
| JP6922375B2 (en) * | 2017-04-20 | 2021-08-18 | 住友電気工業株式会社 | In-vehicle communication system, in-vehicle device, communication control method and communication control program |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888679A (en) * | 2010-05-31 | 2010-11-17 | 西南交通大学 | Multi-vehicle mounted station cooperation cell switching method for train-ground communication under high-speed moving environment |
| CN102387556A (en) * | 2011-10-18 | 2012-03-21 | 西南交通大学 | Inter-cell handover method of train-ground communication based on cooperative multipoint transmission in high-speed mobile environment |
-
2013
- 2013-01-09 CN CN201310007167.6A patent/CN103095410B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888679A (en) * | 2010-05-31 | 2010-11-17 | 西南交通大学 | Multi-vehicle mounted station cooperation cell switching method for train-ground communication under high-speed moving environment |
| CN102387556A (en) * | 2011-10-18 | 2012-03-21 | 西南交通大学 | Inter-cell handover method of train-ground communication based on cooperative multipoint transmission in high-speed mobile environment |
Non-Patent Citations (1)
| Title |
|---|
| LTE-Advanced Modem Design:Challenges and Perspectives;Dongwoon Bai,et al;《IEEE Communications Magazine》;20120229;第178-186页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103095410A (en) | 2013-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101009145B1 (en) | Decision method for downlink ack/nack feedback signal at a terminal in soft-handover | |
| US8089919B2 (en) | Packet transmission acknowledgement in wireless communication system | |
| CN103095410B (en) | A kind of rail communication error control method | |
| EP1863210B1 (en) | Retransmission apparatus and method in wireless relay communication system | |
| US8332704B2 (en) | Apparatus and method for supporting automatic retransmission request (ARQ) in a wireless relay communication system | |
| KR101532789B1 (en) | Harq operation method for retransmitted data | |
| CN104170302B (en) | Method and the base station of the data stream to user equipment are controlled in wireless communication system | |
| US20120044798A1 (en) | Data Retransmission Method and User Equipment | |
| CN104022856B (en) | Reduce the TTI binding method of traffic delay in a kind of TD LTE systems | |
| EP2521327B1 (en) | Method and apparatus for sending / receiving a control signaling and corresponding data packet control | |
| CN101237310B (en) | A method for enhanced self-adapted data retransfer | |
| EP2387834A1 (en) | Timer poll retransmission expiry in a wireless communication system | |
| KR20090098750A (en) | Apparatus and method for retransmitting of data in wireless communication system using relay | |
| CN101969369A (en) | Method, system and device for switching multiple input/multiple output (MIMO) transmission modes | |
| US9491269B2 (en) | Uplink transmission rate in a wireless communication device | |
| CN103546245B (en) | A kind of data package retransmission method of coding Network Based | |
| WO2017220855A1 (en) | Method and apparatus for performing packet duplication in a multi-connectivity scenario | |
| KR101124066B1 (en) | Interaction method between arq and harq for the system with long round trip delay | |
| CN102301798A (en) | Method, System And Device For Enhancing The Uplink Coverage Capacity Of The User Equipment | |
| AU2005272274B2 (en) | Packet transmission acknowledgement in wireless communication system | |
| CN104184568A (en) | Data transmission method and system of communication system | |
| CN103703828A (en) | Data transmission method and apparatus | |
| CN1249582C (en) | Data transmission method and radio system | |
| CN101222303B (en) | Method for implementing media access control layer ascending feedback | |
| CN102356588A (en) | Methods and arrangements in a wireless telecommunication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160323 Termination date: 20190109 |