CN103167629B - 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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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 multi-user depends on base station to realize Signal transmissions.But at one without base station area, there is multiple group (group), each user can belong to multiple group, also cannot realize following communication (half-duplex) at present:
The voice call of the one-to-many 1, in group; 2: the switching (priority for group) of multigroup group voice call.
Summary of the invention
The present invention is in order in the voice call realizing the one-to-many in group without base station area, and the switching of multigroup group voice call, thus based on the network-off direct-passing communication means of group under providing a kind of public network TD-LTE.
Based on the network-off direct-passing communication means of group under public network TD-LTE, 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 PSCH channel, finds idle continuous bandwidth;
Steps A 2, user A judge whether to find idle continuous bandwidth, if judged result is yes, then perform steps A 3; If judged result is no, then returns and perform steps A 1;
Steps A 3, user A send preface information to PRACH channel;
Other in steps A 4, group is with monitoring PRACH channel per family, and the preface information that in equal receiving step A3, user A sends;
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 voice call bandwidth that session will take being carried out one-to-many in group to;
When user in this group carries out voice communication, user A regularly sends preface information to PRACH channel;
When user in this group carries out voice communication, all use in this group synchronously monitor the information of PRACH channel per family;
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 PSCH channel, finds idle continuous bandwidth;
Step B2, user F judge whether to find idle continuous bandwidth, if judged result is yes, then perform step B3; If judged result is no, then returns and perform step B1;
Step B3, user F send preface information to PRACH channel;
Other use except user A in step B4, former group monitors PRACH channel per family, and the preface information that in equal receiving step B3, user F sends;
Other user in step B5, former group except user A carries out synchronous decoding to the preface information that the user F received in step B4 sends respectively, and in former group, except user A, each use judges whether the priority of user F is greater than the priority of user A per family; If judged result is yes, then perform step B6; If judged result is no, then keep the voice communication between user A;
In step B6, this former group, user forwards in bandwidth that session will take and carries out voice communication with all users in new group;
When user in user in former group and new group carries out voice communication, user F regularly sends preface information to PRACH channel;
When user in user in former group and new group carries out voice communication, each use in new group synchronously monitors the information of PRACH channel per family.
The resource block information that synchronizing information and session will take is included in steps A 3 and the preface information described in 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 PCCH channel; Remaining Resource Block is used for PSCH channel.
Each user in former group and each user in Xin group are dual-mode handset.
Being specially of voice call of one-to-many in group described in steps A 5:
In group, any one user sends synchronizing information PCCH channel in the cycle; Other in group with receiving this synchronizing information per family, and is decoded, and realizes a voice call.
In the group of step B6 Central Plains, user forwards the method for bandwidth that session will take being carried out voice communication with all users in new group to and is:
The method that in former group, user carries out voice communication to all users in new group is:
In former group, any one user sends synchronizing information PCCH channel in the cycle; In new group, all use receives this synchronizing information per family, and decodes, and realizes a voice call;
The method that in new group, user carries out voice communication to all users in former group is:
In new group, any one user sends synchronizing information PCCH channel in the cycle; In former group, all use receives this synchronizing information per family, and decodes, and realizes a voice call.
Present invention achieves 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 under embodiment one, public network TD-LTE, 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 PSCH channel, finds idle continuous bandwidth;
Steps A 2, user A judge whether to find idle continuous bandwidth, if judged result is yes, then perform steps A 3; If judged result is no, then returns and perform steps A 1;
Steps A 3, user A send preface information to PRACH channel;
Other in steps A 4, group is with monitoring PRACH channel per family, and the preface information that in equal receiving step A3, user A sends;
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 voice call bandwidth that session will take being carried out one-to-many in group to;
When user in this group carries out voice communication, user A regularly sends preface information to PRACH channel;
When user in this group carries out voice communication, all use in this group synchronously monitor the information of PRACH channel per family;
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 PSCH channel, finds idle continuous bandwidth;
Step B2, user F judge whether to find idle continuous bandwidth, if judged result is yes, then perform step B3; If judged result is no, then returns and perform step B1;
Step B3, user F send preface information to PRACH channel;
Other use except user A in step B4, former group monitors PRACH channel per family, and the preface information that in equal receiving step B3, user F sends;
Other user in step B5, former group except user A carries out synchronous decoding to the preface information that the user F received in step B4 sends respectively, and in former group, except user A, each use judges whether the priority of user F is greater than the priority of user A per family; If judged result is yes, then perform step B6; If judged result is no, then keep the voice communication between user A;
In step B6, this former group, user forwards in bandwidth that session will take and carries out voice communication with all users in new group;
When user in user in former group and new group carries out voice communication, user F regularly sends preface information to PRACH channel;
When user in user in former group and new group carries out voice communication, each use in new group synchronously monitors the information of PRACH channel per family.
The resource block information that synchronizing information and session will take is included in steps A 3 and the preface information described in 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 PCCH channel; Remaining Resource Block is used for PSCH channel.
Each user in former group and each user in Xin group are dual-mode handset.
Being specially of voice call of one-to-many in group described in steps A 5:
In group, any one user sends synchronizing information PCCH channel in the cycle; Other in group with receiving this synchronizing information per family, and is decoded, and realizes a voice call.
In the group of step B6 Central Plains, user forwards the method for bandwidth that session will take being carried out voice communication with all users in new group to and is:
The method that in former group, user carries out voice communication to all users in new group is:
In former group, any one user sends synchronizing information PCCH channel in the cycle; In new group, all use receives this synchronizing information per family, and decodes, and realizes a voice call;
The method that in new group, user carries out voice communication to all users in former group is:
In new group, any one user sends synchronizing information PCCH channel in the cycle; In former group, all use receives this synchronizing information per family, and decodes, and realizes a voice call.
The present invention seeks to make communication process when public network TD-LTE off-grid (namely there is no base station), the point-to-multipoint half-duplex operation based on group can be realized, support that user switches between the group of different priorities simultaneously.
Theoretical foundation and explanation of nouns:
Resource Unit a: Resource Unit is made up of (being 0.5/6ms during expansion CP) the time slot of a 0.5/7ms in a subcarrier (15KHZ) on frequency domain and time domain;
SC-FDMA symbol: a SC-FDMA symbol is made up of (using length when expanding CP in time domain to be 0.5/6ms) 0.5/7ms in multiple continuous print subcarrier longitudinal on frequency domain and time domain.A time slot (0.5ms) comprises 7 or 6 SC-FDMA symbols;
PRB: one PRB block is made up of (12 × 7 (6) individual Resource Unit) the 0.5ms in 12 continuous print subcarriers on frequency domain and time domain, and minimum bandwidth is made up of 72 sub-carrier waves;
In the present invention, send when control channel information (PCCH) is different with data channel information (PSCH);
Synchronizing process: by master sync signal (Zadoff-Chu sequence, PSS) and auxiliary synchronous signals (m sequence, SSS), the sequence first generated by terminal itself is relevant to PSS, obtains time synchronized; Then SSS is found to carry out Frequency Synchronization by relation fixing between SSS and PSS position, so far same EOS;
Uplink and downlink sub-frame allocation mode: namely uplink and downlink subframe quantity distribute (such as: 4 up then 4 descending);
Channel is divided into three classes below:
Random Access Channel PRACH (one): be in whole bandwidth central authorities 1.08MHZ (6 PRB blocks), for transmission and reception: notice is initiated in call; The data channel that call takies and control channel position;
Data channel PSCH (multiple, to depend on group number and amount of voice data): be positioned in the middle of control channel, take multiple bandwidth, for transmitting and receiving data;
Control channel PCCH is (multiple, each data channel has two control channels): the front and the rear that are positioned at data channel, (front can be used for for half, sends master sync signal respectively to account for half bandwidth, rear half for sending auxiliary synchronous signals), divide out, for transmitting reception synchronizing information from PSCH.
Embodiment two, below in conjunction with specific embodiment, the present invention is described, the present embodiment comprises Liang Ge group, and the user in former group comprises: A, B, C, D and E; User in new group comprises: F.
Idiographic flow is:
1, A monitors PSCH channel and finds idle continuous bandwidth.
2, after A finds enough continuous bandwidth, preface information (notice of session start) is sent to PRACH;
Preface information content is 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 the end message (decode procedure: time synchronized, Frequency Synchronization) of group information that A will initiate and A by decoding synchronizing information;
The bandwidth information that session will take: give tacit consent to first half (36 subcarriers, the 0.5MHZ) of bandwidth that take and last half for PCCH channel, centre is PSCH channel, and this information also can cover in the synchronizing information of preface information
A forwards in the bandwidth that will take and starts session.
3, B, C, D, E monitor the information on PRACH, receive the preface information that A sends, carry out synchronous decoding, forward in bandwidth that session will take and start session.
4 & 5, A, B, C, D, E send session successively on the Resource Block that will take, be send synchronizing information the cycle (to comprise master sync signal (Zadoff-Chu sequence) and auxiliary synchronous signals (m sequence) by PCCH with 5ms, receiving terminal can obtain end message by decoding synchronizing information and keep synchronous), send speech information by PSCH.Simultaneously in order to avoid the terminal had does not receive conversation informing in the 3rd step, A regularly sends preface information on PRACH.Each terminal also monitors PRACH channel to accept the conversation informing of new group at any time while group 1 session simultaneously;
6, F monitors PSCH channel and finds idle continuous bandwidth.
7, after F finds enough continuous bandwidth, preface information (notice of session start) is sent to PRACH;
Preface information content is 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 the end message of group information that F will initiate and F by decoding synchronizing information;
The bandwidth information that session will take: to give tacit consent to before the bandwidth that takies 2 to 3 and last 2 to 3 for PCCH channel, centre is PSCH channel, and this information also can cover in the synchronizing information of preface information;
F forwards in the bandwidth that will take and starts session.
8, B, C, D monitor the information on PRACH, receive the preface information that F sends, carry out synchronous decoding, and for B, C, the priority (priority is set by user oneself) of group 2 is higher, therefore forward in bandwidth that session will take and start session.Come for D, the priority of former group is higher, therefore continues to conversate in former group;
9 & 10, B, C, F send session successively on the Resource Block that will take, be send synchronizing information the cycle (to comprise master sync signal (Zadoff-Chu sequence) and auxiliary synchronous signals (m sequence) by PCCH with 5ms, receiving terminal can obtain end message by decoding synchronizing information and keep synchronous), send speech information by PSCH.Simultaneously in order to avoid the terminal had does not receive conversation informing in the 8th step, F regularly sends preface information on PRACH.Each terminal also monitors the information of PRACH channel while new cluster conversation simultaneously.
In present embodiment, likely produced problem and corresponding solution are:
1, A and F may have conflict on PRACH channel:
Solution: because the notice that PRACH channel only will be set up for cluster conversation, once session establishment can discharge, the synchronizing information of cluster conversation inside is sent by PCCH.The information duration on PRACH is short, and the repetition period is long, therefore should not clash, even if conflict also can wait set up for several seconds again.
2, Resource Block (or bandwidth) how release:
Solution: after all completing call in group, can discharge Resource Block, next time during session establishment, then is repeated the process of 1-5 in 3.2 by promoter.
The transmission of the inadequate primary and secondary synchronization signals of the sub-carrier number 3, shared by PCCH.
Solution: the sub-carrier number (being generally no more than 72, i.e. a bandwidth) suitably increasing PCCH, or before two PCCH combining channels are placed on PSCH channel.
4, the step-out that causes of the high-speed mobile of terminal and terminal:
Solution: employing 5ms is that the primary and secondary synchronization signals in cycle ensures the synchronous of communication, also can continue to monitor on the PCCH of session to have completed synchronously during step-out simultaneously.
5, interference problem;
Solution: except using except CP, also can allow be Resource Block often pair shared by call two ends outside vacate the bandwidth of half Resource Block.
Claims (4)
1. 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:
User A monitored data channel (PSCH) in steps A 1, group, finds idle continuous bandwidth;
Steps A 2, user A judge whether to find idle continuous bandwidth, if judged result is yes, then perform steps A 3; If judged result is no, then returns and perform steps A 1;
Steps A 3, user A send preface information to Random Access Channel (PRACH);
Other in steps A 4, group is with monitoring PRACH channel per family, and the preface information that in equal receiving step A3, user A sends;
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 voice call bandwidth that session will take being carried out one-to-many in group to;
When user in this group carries out voice communication, user A regularly sends preface information to PRACH channel;
When user in this group carries out voice communication, all use in this group synchronously monitor the information of PRACH channel per family;
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 PSCH channel, finds idle continuous bandwidth;
Step B2, user F judge whether to find idle continuous bandwidth, if judged result is yes, then perform step B3; If judged result is no, then returns and perform step B1;
Step B3, user F send preface information to PRACH channel;
Other use except user A in step B4, former group monitors PRACH channel per family, and the preface information that in equal receiving step B3, user F sends;
Other user in step B5, former group except user A carries out synchronous decoding to the preface information that the user F received in step B4 sends respectively, and in former group, except user A, each use judges whether the priority of user F is greater than the priority of user A per family; If judged result is yes, then perform step B6; If judged result is no, then keep the voice communication between user A;
In step B6, this former group, user forwards in bandwidth that session will take and carries out voice communication with all users in new group;
When user in user in former group and new group carries out voice communication, user F regularly sends preface information to PRACH channel;
When user in user in former group and new group carries out voice communication, each use in new group synchronously monitors the information of PRACH channel per family.
The resource block information that synchronizing information and session will take is included in steps A 3 and the preface information described in 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 control channel (PCCH); Remaining Resource Block is used for PSCH channel.
2. 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.
3. 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 the voice call of one-to-many in group described in steps A 5 is specially:
In group, any one user sends synchronizing information PCCH channel in the cycle; Other in group with receiving this synchronizing information per family, and is decoded, and realizes a voice call.
4. 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 forwards the method for bandwidth that session will take being carried out voice communication with all users in new group to and is:
The method that in former group, user carries out voice communication to all users in new group is:
In former group, any one user sends synchronizing information PCCH channel in the cycle; In new group, all use receives this synchronizing information per family, and decodes, and realizes a voice call;
The method that in new group, user carries out voice communication to all users in former group is:
In new group, any one user sends synchronizing information PCCH channel in the cycle; In former group, all use receives this synchronizing information per family, and decodes, and realizes a voice call.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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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| WO2005064970A1 (en) * | 2003-12-23 | 2005-07-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Controlling reconfiguration in a cellular communication system |
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| CN101394586A (en) * | 2007-09-20 | 2009-03-25 | 华为技术有限公司 | Uplink system resource sharing method, apparatus and system |
| CN102916794A (en) * | 2008-04-03 | 2013-02-06 | 华为技术有限公司 | Channel distribution method and device, and base station subsystem |
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| WO2005064970A1 (en) * | 2003-12-23 | 2005-07-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Controlling reconfiguration in a cellular communication system |
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