CN103167629A - Method for performing off-line direct mode operation based on groups under public network time division-long term evolution (TD-LTE) - Google Patents
Method for performing off-line direct mode operation based on groups under public network time division-long term evolution (TD-LTE) Download PDFInfo
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- CN103167629A CN103167629A CN 201310094607 CN201310094607A CN103167629A CN 103167629 A CN103167629 A CN 103167629A CN 201310094607 CN201310094607 CN 201310094607 CN 201310094607 A CN201310094607 A CN 201310094607A CN 103167629 A CN103167629 A CN 103167629A
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Abstract
The invention discloses a method for performing off-line direct mode operation based on groups under public network time division-long term evolution (TD-LTE), relates to a method for performing off-line direct mode operation based on the groups and aims to realize one-to-many voice communication in the groups and switching of voice communication of multiple groups in a base station-free area. A method for performing one-to-many voice communication in the groups comprises the following steps that a user A in the groups monitors a physical shared channel (PSCH), finds an idle continuous bandwidth, and then sends preface information to a physical random access channel (PRACH); other users in the groups all monitor the PRACH, receive preface information sent by the user A, decode the information synchronously, and switch to a bandwidth to be occupied by a session to perform voice communication with the user A; and a method for switching voice communication of multiple groups comprises the following steps of: judging the priority levels of users except the user A in the original group, selecting the group with the higher priority level, and perform voice communication with the group with the higher priority level. The method is suitable for off-line direct mode operation based on the groups under public network TD-LTE.
Description
Technical field
The present invention relates to a kind of network-off direct-passing communication means based on group.
Background technology
At present, the communication between the multi-user is to depend on the base station to realize the signal transmission.But, without base station area, there are a plurality of groups (group) at one, each user can belong to a plurality of groups, also can't realize at present following communication (half-duplex):
1, the voice call of the one-to-many in group; 2: the switching of multigroup group voice call (for the priority of group).
Summary of the invention
The present invention is in order to realize the voice call of the one-to-many in group without base station area, and the switching of multigroup group voice call, thereby the network-off direct-passing communication means based on group is provided under a kind of public network TD-LTE.
Based on the network-off direct-passing communication means of group, it is characterized in that under public network TD-LTE:
The audio communication method of the one-to-many in its group is realized by following steps:
A user A in steps A 1, group monitors the PSCH channel, seeks idle continuous bandwidth;
Steps A 2, user A judge whether to find idle continuous bandwidth, if judgment result is that and be, and execution in step A3; If the determination result is NO, return to execution in step A1;
Steps A 3, user A send preface information to the PRACH channel;
Other in steps A 4, group be with monitoring per family the PRACH channel, and the preface information that all user A sends in receiving step A3;
Other user in steps A 5, group carries out synchronous decoding to the preface information that the user A that receives in steps A 4 sends respectively, and all forwards the voice call of carrying out one-to-many in group on the bandwidth that session will take to;
When the user in this group carried out voice communication, user A regularly sent preface information to the PRACH channel;
When the user in this group carried out voice communication, all in this group were with synchronously monitoring per family the information of PRACH channel;
Above-mentioned group is designated as former group, and in the voice call process of the one-to-many in this former group, the switching of its multigroup group voice call is realized by following steps:
User F in step B1, new group monitors the PSCH channel, seeks idle continuous bandwidth;
Step B2, user F judge whether to find idle continuous bandwidth, if judgment result is that and be, and execution in step B3; If the determination result is NO, return to execution in step B1;
Step B3, user F send preface information to the PRACH channel;
Other except user A in step B4, former group be with monitoring per family the PRACH channel, and the preface information that all user F sends in receiving step B3;
Other user in step B5, former group except user A carries out synchronous decoding to the preface information that the user F that receives in step B4 sends respectively, and whether the priority that former group in, each use judges user F per family except user A is greater than the priority of user A; If judgment result is that to be, execution in step B6; If the determination result is NO, the voice communication between maintenance and user A;
In step B6, this former group the user forward on the bandwidth that session will take with new group in all users carry out voice communication;
When the user in the user in former group and new group carried out voice communication, user F regularly sent preface information to the PRACH channel;
When the user in the user in former group and new group carried out voice communication, each in new group was with synchronously monitoring per family the information of PRACH channel.
Include the Resource Block information that synchronizing information and session will take in preface information described in steps A 3 and step B3;
Described synchronizing information is: master sync signal and auxiliary synchronous signals;
The Resource Block information that session will take is: front 2 to 3 Resource Block and last 2 to 3 Resource Block of acquiescence occupied bandwidth are used for the PCCH channel; Remaining Resource Block is used for the PSCH channel.
Each user in each user in former group and Xin group is dual-mode handset.
Being specially of the voice call of one-to-many in group described in steps A 5:
In group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; Other in group be with receiving per family this synchronizing information, and decode, and realizes a voice call.
In the group of step B6 Central Plains the user forward on the bandwidth that session will take with new group in all users method of carrying out voice communication be:
In former group, user all users in the new group carry out the method for voice communication and are:
In former group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; In new group, all with receiving per family this synchronizing information, and are decoded, and realize a voice call;
In new group, user all users in the former group carry out the method for voice communication and are:
In new group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; In former group, all with receiving per family this synchronizing information, and are decoded, and realize a voice call.
The present invention has realized without base station area, the voice call of the one-to-many in group, and the switching of multigroup group voice call.
Embodiment
Based on the network-off direct-passing communication means of group, it is characterized in that under embodiment one, public network TD-LTE:
The audio communication method of the one-to-many in its group is realized by following steps:
A user A in steps A 1, group monitors the PSCH channel, seeks idle continuous bandwidth;
Steps A 2, user A judge whether to find idle continuous bandwidth, if judgment result is that and be, and execution in step A3; If the determination result is NO, return to execution in step A1;
Steps A 3, user A send preface information to the PRACH channel;
Other in steps A 4, group be with monitoring per family the PRACH channel, and the preface information that all user A sends in receiving step A3;
Other user in steps A 5, group carries out synchronous decoding to the preface information that the user A that receives in steps A 4 sends respectively, and all forwards the voice call of carrying out one-to-many in group on the bandwidth that session will take to;
When the user in this group carried out voice communication, user A regularly sent preface information to the PRACH channel;
When the user in this group carried out voice communication, all in this group were with synchronously monitoring per family the information of PRACH channel;
Above-mentioned group is designated as former group, and in the voice call process of the one-to-many in this former group, the switching of its multigroup group voice call is realized by following steps:
User F in step B1, new group monitors the PSCH channel, seeks idle continuous bandwidth;
Step B2, user F judge whether to find idle continuous bandwidth, if judgment result is that and be, and execution in step B3; If the determination result is NO, return to execution in step B1;
Step B3, user F send preface information to the PRACH channel;
Other except user A in step B4, former group be with monitoring per family the PRACH channel, and the preface information that all user F sends in receiving step B3;
Other user in step B5, former group except user A carries out synchronous decoding to the preface information that the user F that receives in step B4 sends respectively, and whether the priority that former group in, each use judges user F per family except user A is greater than the priority of user A; If judgment result is that to be, execution in step B6; If the determination result is NO, the voice communication between maintenance and user A;
In step B6, this former group the user forward on the bandwidth that session will take with new group in all users carry out voice communication;
When the user in the user in former group and new group carried out voice communication, user F regularly sent preface information to the PRACH channel;
When the user in the user in former group and new group carried out voice communication, each in new group was with synchronously monitoring per family the information of PRACH channel.
Include the Resource Block information that synchronizing information and session will take in preface information described in steps A 3 and step B3;
Described synchronizing information is: master sync signal and auxiliary synchronous signals;
The Resource Block information that session will take is: front 2 to 3 Resource Block and last 2 to 3 Resource Block of acquiescence occupied bandwidth are used for the PCCH channel; Remaining Resource Block is used for the PSCH channel.
Each user in each user in former group and Xin group is dual-mode handset.
Being specially of the voice call of one-to-many in group described in steps A 5:
In group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; Other in group be with receiving per family this synchronizing information, and decode, and realizes a voice call.
In the group of step B6 Central Plains the user forward on the bandwidth that session will take with new group in all users method of carrying out voice communication be:
In former group, user all users in the new group carry out the method for voice communication and are:
In former group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; In new group, all with receiving per family this synchronizing information, and are decoded, and realize a voice call;
In new group, user all users in the former group carry out the method for voice communication and are:
In new group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; In former group, all with receiving per family this synchronizing information, and are decoded, and realize a voice call.
The present invention seeks to make communication process in the situation that public network TD-LTE off-grid (namely there is no the base station) is realized the point-to-multipoint half-duplex operation based on group, to support simultaneously the user to switch between the group of different priorities.
Theoretical foundation and explanation of nouns:
Resource Unit: Resource Unit forms (being 0.5/6ms when expanding CP) by the time slot of a 0.5/7ms on a subcarrier (15KHZ) and time domain on frequency domain;
The SC-FDMA symbol: SC-FDMA symbol by on frequency domain longitudinally on a plurality of continuous subcarriers and time domain 0.5/7ms form (use when expanding CP, the length on time domain is 0.5/6ms).A time slot (0.5ms) comprises 7 or 6 SC-FDMA symbols;
PRB: PRB piece forms (12 * 7 (6) individual Resource Unit) by 12 continuous subcarriers on frequency domain and the 0.5ms on time domain, and minimum bandwidth is comprised of 72 sub-carrier waves;
In the present invention, control channel information (PCCH) and data channel information (PSCH) do not send simultaneously;
Synchronizing process: by master sync signal (the Zadoff-Chu sequence, PSS) and auxiliary synchronous signals (the m sequence, SSS), the sequence that is at first generated by terminal itself is relevant to PSS, obtains time synchronized; Then find SSS to carry out Frequency Synchronization by fixing relation between SSS and PSS position, so far same EOS;
Uplink and downlink sub-frame allocation mode: namely the quantity of uplink and downlink subframe distribute (for example: 4 up then 4 descending);
Channel is divided into following three classes:
Random Access Channel PRACH (one): be in the whole bandwidth 1.08MHZ (6 PRB pieces) of central authorities, be used for sending reception: notice is initiated in conversation; The data channel that takies of conversation and control channel position;
Data channel PSCH (a plurality of, as to depend on group number and amount of voice data): be positioned in the middle of control channel, take a plurality of bandwidth, be used for transmitting and receiving data;
Control channel PCCH is (a plurality of, each data channel has two control channels): the place ahead and the rear that are positioned at data channel, respectively account for half bandwidth and (can be used for sending master sync signal front half, be used for sending auxiliary synchronous signals rear half), divide out from PSCH, be used for the transmission receiving synchronous information.
Embodiment two, below in conjunction with specific embodiment explanation the present invention, the present embodiment comprises two groups, the user in former group comprises: A, B, C, D and E; User in new group comprises: F.
Idiographic flow is:
1, A monitors the PSCH channel and seeks idle continuous bandwidth.
2, after A finds enough continuous bandwidth, send preface information (notice that session begins) to PRACH;
Preface information thes contents are as follows:
The synchronizing information of preface information: comprise master sync signal (Zadoff-Chu sequence) and auxiliary synchronous signals (m sequence), receiving terminal can obtain group information that A will initiate and the end message (decode procedure: time synchronized, Frequency Synchronization) of A by the decoding synchronizing information;
The bandwidth information that session will take: (36 subcarriers 0.5MHZ) are used for the PCCH channel with last half, and the centre is the PSCH channel, and this information also can cover in the synchronizing information of preface information in front half of the bandwidth that acquiescence takies
A forwards on the bandwidth that will take and begins session.
3, B, C, D, E monitor the information on PRACH, receive the preface information that A sends, and carry out synchronous decoding, forward on the bandwidth that session will take to begin session.
4﹠amp; 5, A, B, C, D, E send session successively on the Resource Block that will take, send synchronizing information by PCCH take 5ms as the cycle and (comprise master sync signal (Zadoff-Chu sequence) and auxiliary synchronous signals (m sequence), receiving terminal can obtain end message and keep synchronous by the decoding synchronizing information), send speech information by PSCH.Do not receive conversation informing for fear of the terminal that has in the 3rd step simultaneously, A is regularly to the upper preface information that sends of PRACH.Each terminal is also monitored the PRACH channel to accept at any time the conversation informing of new group in group's 1 session simultaneously;
6, F monitors the PSCH channel and seeks idle continuous bandwidth.
7, after F finds enough continuous bandwidth, send preface information (notice that session begins) to PRACH;
Preface information thes contents are as follows:
The synchronizing information of preface information: comprise master sync signal (Zadoff-Chu sequence) and auxiliary synchronous signals (m sequence), receiving terminal can obtain group information that F will initiate and the end message of F by the decoding synchronizing information;
The bandwidth information that session will take: front 2 to 3 and last 2 to 3 of the bandwidth that acquiescence takies is used for the PCCH channel, and the centre is the PSCH channel, and this information also can cover in the synchronizing information of preface information;
F forwards on the bandwidth that will take and begins session.
8, B, C, D monitor the information on PRACH, receive the preface information that F sends, and carry out synchronous decoding, and for B, C, the priority of group 2 (priority is set by user oneself) is higher, so forward on the bandwidth that session will take and begin session.Come for D, the priority of former group is higher, therefore continues to carry out in former group session;
9﹠amp; 10, B, C, F send session successively on the Resource Block that will take, send synchronizing information by PCCH take 5ms as the cycle and (comprise master sync signal (Zadoff-Chu sequence) and auxiliary synchronous signals (m sequence), receiving terminal can obtain end message and keep synchronous by the decoding synchronizing information), send speech information by PSCH.Do not receive conversation informing for fear of the terminal that has in the 8th step simultaneously, F is regularly to the upper preface information that sends of PRACH.Each terminal is also monitored the information of PRACH channel in new cluster conversation simultaneously.
In present embodiment, the problem that might occur and corresponding solution are:
1, A may have on the PRACH channel with F and conflict:
Solution: because the PRACH channel only is used for the notice that cluster conversation will be set up, in case session establishment can discharge, the synchronizing information of cluster conversation inside sends by PCCH.The information duration on PRACH is short, and the repetition period is long, therefore should not clash, and sets up even conflict also can wait several seconds again.
2, how Resource Block (or bandwidth) one discharges:
Solution: after all completing conversation in group, Resource Block can be discharged, next time during session establishment, then be repeated the process of 1-5 in 3.2 by the promoter.
3, the transmission of the shared inadequate primary and secondary synchronization signals of sub-carrier number of PCCH.
Solution: suitably increase the sub-carrier number (generally being no more than 72, i.e. a bandwidth) of PCCH, before perhaps two PCCH combining channels being placed on the PSCH channel.
4, the step-out that causes of the high-speed mobile of terminal and terminal:
Solution: adopt 5ms be the primary and secondary synchronization signals in cycle guarantee to communicate by letter synchronous, also can continue to monitor on the PCCH of session during step-out simultaneously and complete synchronously.
5, interference problem;
Solution: except using CP, also can allow is the bandwidth of vacating half Resource Block outside the two ends of the shared Resource Block of the every pair of conversation.
Claims (4)
- Under public network TD-LTE based on the network-off direct-passing communication means of group, it is characterized in that:The audio communication method of the one-to-many in its group is realized by following steps:A user A in steps A 1, group monitors the PSCH channel, seeks idle continuous bandwidth;Steps A 2, user A judge whether to find idle continuous bandwidth, if judgment result is that and be, and execution in step A3; If the determination result is NO, return to execution in step A1;Steps A 3, user A send preface information to the PRACH channel;Other in steps A 4, group be with monitoring per family the PRACH channel, and the preface information that all user A sends in receiving step A3;Other user in steps A 5, group carries out synchronous decoding to the preface information that the user A that receives in steps A 4 sends respectively, and all forwards the voice call of carrying out one-to-many in group on the bandwidth that session will take to;When the user in this group carried out voice communication, user A regularly sent preface information to the PRACH channel;When the user in this group carried out voice communication, all in this group were with synchronously monitoring per family the information of PRACH channel;Above-mentioned group is designated as former group, and in the voice call process of the one-to-many in this former group, the switching of its multigroup group voice call is realized by following steps:User F in step B1, new group monitors the PSCH channel, seeks idle continuous bandwidth;Step B2, user F judge whether to find idle continuous bandwidth, if judgment result is that and be, and execution in step B3; If the determination result is NO, return to execution in step B1;Step B3, user F send preface information to the PRACH channel;Other except user A in step B4, former group be with monitoring per family the PRACH channel, and the preface information that all user F sends in receiving step B3;Other user in step B5, former group except user A carries out synchronous decoding to the preface information that the user F that receives in step B4 sends respectively, and whether the priority that former group in, each use judges user F per family except user A is greater than the priority of user A; If judgment result is that to be, execution in step B6; If the determination result is NO, the voice communication between maintenance and user A;In step B6, this former group the user forward on the bandwidth that session will take with new group in all users carry out voice communication;When the user in the user in former group and new group carried out voice communication, user F regularly sent preface information to the PRACH channel;When the user in the user in former group and new group carried out voice communication, each in new group was with synchronously monitoring per family the information of PRACH channel.Include the Resource Block information that synchronizing information and session will take in preface information described in steps A 3 and step B3;Described synchronizing information is: master sync signal and auxiliary synchronous signals;The Resource Block information that session will take is: front 2 to 3 Resource Block and last 2 to 3 Resource Block of acquiescence occupied bandwidth are used for the PCCH channel; Remaining Resource Block is used for the PSCH channel.
- Under public network TD-LTE according to claim 1 based on the network-off direct-passing communication means of group, it is characterized in that each user in former group and each user in Xin group are dual-mode handset.
- Under public network TD-LTE according to claim 1 based on the network-off direct-passing communication means of group, it is characterized in that described in steps A 5 being specially of the voice call of one-to-many in group:In group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; Other in group be with receiving per family this synchronizing information, and decode, and realizes a voice call.
- Under public network TD-LTE according to claim 3 based on the network-off direct-passing communication means of group, it is characterized in that user in the group of step B6 Central Plains forward on the bandwidth that session will take with new group in all users method of carrying out voice communication be:In former group, user all users in the new group carry out the method for voice communication and are:In former group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; In new group, all with receiving per family this synchronizing information, and are decoded, and realize a voice call;In new group, user all users in the former group carry out the method for voice communication and are:In new group, any one user sends synchronizing information PCCH channel take 5ms as the cycle; In former group, all with receiving per family this synchronizing information, and are decoded, and realize a voice call.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945562A (en) * | 2014-04-04 | 2014-07-23 | 哈尔滨工业大学 | Off-line and on-line switching and information transmission method under TD-LTE based on group |
| CN104378743A (en) * | 2014-12-05 | 2015-02-25 | 哈尔滨工业大学 | TD-LTE offline group multicast communication method |
| CN104640145A (en) * | 2013-11-13 | 2015-05-20 | 普天信息技术有限公司 | Method and system for solving time-frequency resource conflicts |
| CN106162858A (en) * | 2015-04-17 | 2016-11-23 | 普天信息技术有限公司 | Directintermination time synchronization method and device |
| CN110891291A (en) * | 2018-09-07 | 2020-03-17 | 华为技术有限公司 | Method and apparatus for transmitting and receiving control information |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101095365B (en) * | 2003-12-23 | 2011-01-26 | 艾利森电话股份有限公司 | Controlling reconfiguration in a celluar communication system |
| CN101155394B (en) * | 2006-09-26 | 2011-06-15 | 北京信威通信技术股份有限公司 | Method for channel transmission resource self-adapting allocation in radio communication system |
| CN101394586B (en) * | 2007-09-20 | 2012-11-21 | 华为技术有限公司 | Uplink system resource sharing method, apparatus and system |
| CN102916794B (en) * | 2008-04-03 | 2015-08-19 | 华为技术有限公司 | Method for channel allocation, device and base station sub-system |
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- 2013-03-22 CN CN201310094607.6A patent/CN103167629B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104640145A (en) * | 2013-11-13 | 2015-05-20 | 普天信息技术有限公司 | Method and system for solving time-frequency resource conflicts |
| CN104640145B (en) * | 2013-11-13 | 2018-02-23 | 普天信息技术有限公司 | A kind of method and system for solving running time-frequency resource conflict |
| CN103945562A (en) * | 2014-04-04 | 2014-07-23 | 哈尔滨工业大学 | Off-line and on-line switching and information transmission method under TD-LTE based on group |
| CN104378743A (en) * | 2014-12-05 | 2015-02-25 | 哈尔滨工业大学 | TD-LTE offline group multicast communication method |
| CN106162858A (en) * | 2015-04-17 | 2016-11-23 | 普天信息技术有限公司 | Directintermination time synchronization method and device |
| CN106162858B (en) * | 2015-04-17 | 2019-08-16 | 普天信息技术有限公司 | Directintermination time synchronization method and device |
| CN110891291A (en) * | 2018-09-07 | 2020-03-17 | 华为技术有限公司 | Method and apparatus for transmitting and receiving control information |
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