CN104968044B - The synchronous method and terminal led directly between LTE terminal based on channel-sounding signal - Google Patents
The synchronous method and terminal led directly between LTE terminal based on channel-sounding signal Download PDFInfo
- Publication number
- CN104968044B CN104968044B CN201510246341.1A CN201510246341A CN104968044B CN 104968044 B CN104968044 B CN 104968044B CN 201510246341 A CN201510246341 A CN 201510246341A CN 104968044 B CN104968044 B CN 104968044B
- Authority
- CN
- China
- Prior art keywords
- terminal
- oneself
- srs
- srs resource
- target
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention provides the synchronous method led directly between a kind of LTE terminal based on channel-sounding signal SRS and terminals, method includes uniquely identifying for the terminal distribution in system, mutually different SRS resource is arranged according to the mark in terminal, and continuously sends out SRS signal in the SRS resource of oneself；When calling terminal needs are communicated with target terminal, calling terminal calculates its corresponding SRS resource by the mark of target terminal, measures to the SRS of target terminal, obtains target terminal and sends required sending time lead TA synchronous with oneself reception；According to TDD wireless channel symmetry, oneself shift to an earlier date TA and initiate to call to target terminal, and brings TA to opposite end；The signal energy reaching on the time target terminal of transmission realizes that the transmission of calling terminal is received synchronous with target terminal；Target terminal adjusts the transmission lead of itself also according to TA simultaneously, realizes that the transmission of target opposite end is synchronous with the reception of calling terminal.To realize the mutually straight-through required time synchronization of LTE terminal.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of LTE(Long Term Evolution) straight-through same of terminal room
One step process and terminal.
Background technique
The technology of direct communication is horizontal also in 2G at present between terminal, and what is transmitted between terminal also only resides within language
Sound business is also faced with the demands such as data traffic transmission between terminal far from actual requirement is met.
Public network comes into the LTE epoch at present, and existing emergency plan generally passes through the access net realization for temporarily building emergency
Emergency communication；But the emergency access net started under special circumstances inherently exists by the risk of secondary attack.Meanwhile not being
At any moment, any place can successfully build emergency system, therefore the demand that LTE terminal is led directly to is particularly evident.
LTE technology has higher requirement to time synchronization.During wireless transmission, LTE technical requirements receiving end is received
When data, at the time of receiving end receives data and transmitting terminal sends the arrival time error of data in a CP(Cyclic
Prefix, cyclic prefix) in the range of；When error is no more than a CP, receiving end can be by the prior art, to receiving
Data accurately parsed；When error is more than a CP, receiving end may not simply fail to the number for correctly parsing this transmission
According to, and can also affect on the transmission of adjacent sub-frame.
Summary of the invention
The present invention provides one kind to be based on SRS(Sounding Reference Signal, Sounding Reference Signal)
The synchronous method and terminal of direct communication between LTE terminal, for solving existing LTE terminal due to cannot achieve synchronization, and can not
Carry out straight-through problem.
To achieve the goals above, the present invention provides the synchronization led directly between a kind of LTE terminal based on channel-sounding signal
Method, comprising:
System is the unique mark of directintermination distribution, and mutually different SRS resource is arranged according to the mark in terminal, should
Terminal continuously sends out the SRS signal of oneself in the SRS resource of oneself；
When calling terminal needs to be communicated with target terminal, calling terminal is according to the mark of target terminal to be called
And the time, calculate the corresponding SRS resource of target terminal；
The SRS that calling terminal is issued by measurement target terminal calculates target terminal and sends data reaching on the time oneself institute
The Timing Advance TA(Time Advance needed)；
Target terminal adjusts the transmission lead of itself also according to the TA received, realizes transmission and the master of target terminal
Make the reception of terminal synchronous, to realize the mutually straight-through time synchronization of LTE terminal.
The system is the unique mark of directintermination distribution, and terminal is arranged mutually different SRS according to the mark and provides
Source, the terminal continuously send out the SRS signal of oneself in the SRS resource of oneself, comprising:
The distribution of SRS resource and the mark of directintermination are related, are corresponding pass one by one between terminal iidentification and SRS resource
System, can calculate the SRS resource of the terminal, and the SRS resource of different terminals is different by terminal iidentification；
Terminal continues to issue the SRS signal of oneself in the SRS resource of oneself.
It is described when calling terminal needs to be communicated with target terminal, calling terminal is according to target terminal to be called
Mark and time calculate the corresponding SRS resource of target terminal, comprising:
The position of terminal SRS resource be it is variable, but the position of SRS resource be can be by the mark of the terminal and current
Time calculate the position of target terminal SRS resource next time.
The calling terminal passes through the SRS that measurement target terminal issues, and calculates target terminal and sends data reaching on the time certainly
Timing Advance TA required for oneself, comprising:
The method that terminal measures SRS is identical with the method for base station measurement SRS, and terminal is after measuring TA value, basis immediately
The time that TA adjusts oneself transmission realizes oneself transmission and mesh so that the transmission of oneself be enable to reach target terminal on time
The reception for marking terminal is synchronous；
According to the symmetrical feature of TDD wireless channel, calling terminal shifts to an earlier date TA and sends data to target terminal, that is, can ensure that certainly
The data reaching on the time target terminal that oneself sends, while the information such as measured TA are notified into target terminal.
The target terminal adjusts the transmission lead of itself also according to the TA received, realizes the transmission of target terminal
It is synchronous with the reception of calling terminal, comprising:
TDD has the symmetrical characteristic of radio resource, and wireless signal is identical in the time of air interface transmission, therefore required for opposite end
Timing Advance it is also identical.
To achieve the goals above, the present invention provides the synchronization led directly between a kind of LTE terminal based on channel-sounding signal
Terminal, comprising:
System is the unique mark of directintermination distribution, and mutually different SRS resource is arranged according to the mark in terminal；
Computing module: for according to target terminal to be called mark and the time, it is whole to calculate the corresponding target of the mark
The SRS resource at end；
Sending module: the SRS of oneself is sent in the SRS resource of oneself for the terminal；Simultaneously oneself is needed to send out
The information sent is sent to opposite end；
Receiving module: the TA information that SRS signal or opposite end for receiving target terminal send over；
Measurement module: the SRS measurement opposite end for being sent according to opposite end sends the Timing Advance TA needed；
Synchronization module: the sending time for adjusting oneself according to the TA for measuring or receiving.
The computing module calculates the SRS resource of the terminal for the mark according to terminal；The terminal is in called
When state, the SRS resource of oneself is calculated according to the mark of oneself, calculated SRS resource is supplied to transmitting module；The end
When end is in caller state, is identified according to the target terminal that will be called, the SRS resource of target terminal is calculated, by the knot of calculating
Fruit notifies receiving module and measurement module.
The sending module is used for when the terminal is in called state, in the calculated SRS resource of computing module institute
The upper SRS for sending oneself；When the terminal is in caller state, the TA that measurement module is measured is sent to target terminal.
The receiving module receives the SRS that called terminal issues when the terminal is in caller state；It is being in quilt
The TA information and call information that calling terminal issues are received when being state.
The synchronization module, according to the TA measured, adjusts the transmission mould of oneself when the terminal is in caller state
Block realizes that the transmission of caller is synchronous with called reception；It is whole according to the caller received when the terminal is in called state
The calling at end and TA adjust the launch time of oneself, keep called transmission synchronous with the reception of caller.
It include for the terminal in system the present invention provides the synchronous method and terminal, method that are led directly between a kind of LTE terminal
The unique mark of distribution, mutually different SRS resource is arranged according to the mark in terminal, and issues in the SRS resource of oneself
SRS signal；When calling terminal needs are communicated with target terminal, it is corresponding that calling terminal by the mark of target terminal calculates its
SRS resource measures the SRS of target terminal, when acquisition target terminal sends required transmission synchronous with oneself reception
Between lead TA；According to TDD wireless channel symmetry, oneself shift to an earlier date TA and initiate to call to target terminal, and brings TA to opposite end；
The signal energy reaching on the time target terminal of transmission realizes that the transmission of calling terminal is received synchronous with target terminal；Mesh simultaneously
Mark terminal adjusts itself transmission lead also according to TA, realize target terminal transmission and calling terminal it is received same
Step, to realize that LTE terminal mutually leads directly to required time synchronization.
Detailed description of the invention
The side of synchronization led directly between a kind of LTE terminal based on channel-sounding signal that Fig. 1 provides for the embodiment of the present invention one
The synchronous flow diagram of calling terminal in method.
Fig. 2 is the side of synchronization led directly between a kind of LTE terminal based on channel-sounding signal provided by Embodiment 2 of the present invention
The synchronous flow diagram of called terminal in method.
The side of synchronization led directly between a kind of LTE terminal based on channel-sounding signal that Fig. 3 provides for the embodiment of the present invention three
The structural schematic diagram of terminal in method.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.
Embodiment one
Fig. 1 is the embodiment of the present invention one, main in the synchronous method led directly between a kind of LTE terminal based on channel-sounding signal
The flow diagram for making terminal synchronous, as shown in Figure 1, this approach includes the following steps.
101, the SRS resource of called terminal is calculated according to the mark of called terminal and time；
Wherein, the mark of the called terminal is to participate in uniquely identifying among straight-through all terminals, that is to say, that is appointed
What one mark is corresponded there is no two terminals, is corresponding one by one, SRS resource and terminal mark between terminal and mark
It is also to correspond between knowledge one by one；
Specifically, the clearly specific terminal of terminal iidentification, terminal iidentification determine the SRS resource of terminal.
102, calling terminal measures the SRS that the called terminal issues；
SRS resource of the calling terminal in 101 calculated called terminals, the SRS that measurement called terminal issues；It is specific to survey
Amount is identical with the method for base station measurement SRS, and particular technique is not repeated herein referring to 36 serial protocols of 3GPP.
103, according to 102 measurement as a result, the transmission for calculating called terminal accurately reach calling terminal receive required for
Timing Advance TA；The method that specific TA calculation method and base station calculate TA is identical, particular technique referring to 3GPP 36 systems
Column agreement, is not repeated herein.
104, the calling terminal mentions previous TA and initiates calling to target terminal, and the TA that 103 are measured as
Call information is sent to called terminal；
TDD radio resource has symmetry, therefore within the shorter time, when identical space is come needed for transmission back
Between it is identical, called terminal need in advance TA data sending could accurately be reached into calling terminal, realize that called terminal is sent and main
Cry terminal received synchronization, and to connect Timing Advance required for called terminal same for the data reaching on the time that calling terminal is sent
It is also the TA；It realizes and synchronizes in order to ensure the transmission of called terminal, the TA of measurement is sent to called terminal.
The calling terminal does not adjust the reception of oneself, only according to the survey calculation of SRS as a result, adjust the transmission of oneself,
Realize that the transmission of calling terminal is synchronous with the reception of called terminal realization；After synchronizing for the first time, calling terminal is subsequent still logical
The method is crossed, the period realizes that sending time adjustment, the reception of the transmission and called terminal that guarantee calling terminal are out-of-step free.
Embodiment two
Fig. 2 is the embodiment of the present invention two, a kind of quilt of the synchronous method led directly between the LTE terminal based on channel-sounding signal
The flow diagram for making terminal synchronous, as shown in Fig. 2, this approach includes the following steps.
It 201, is the unique mark of terminal configuration before terminal direct connection, according to mark setting SRS resource and in the resource
Issue SRS；
It is that perfectly correlated, different terminal SRS resource is different between terminal, terminal iidentification and SRS resource；Its
SRS resource not necessarily has identical periodicity, but can accurately be calculated down according to terminal iidentification and current time
The position of SRS resource, and SRS is issued in SRS resource.
202, called terminal issues SRS in the SRS resource of oneself；
Wherein, no matter whether the SRS resource of terminal has periodicity, is calculated according to terminal iidentification and current time next
The position of secondary SRS resource, and SRS is issued on the resource, the method for issuing SRS has clear in 36 serial protocols of 3GPP
Description, be not repeated herein.
203, the called terminal receives and parses through the information of calling terminal sending；
Calling and called terminal is communicated for the first time using prior art realization, and called terminal parses the TA that calling terminal issues oneself
Information.
204, the called terminal adjusts oneself sending time according to the TA being resolved to；
The called terminal adjusts the transmission of oneself according to the TA that calling terminal issues oneself, realizes called terminal transmission
Time synchronization between calling terminal reception；Subsequent sending time adjust in advance still according to calling terminal send TA information into
Row.
Embodiment three
Fig. 3 is the embodiment of the present invention three, a kind of end of the synchronous method led directly between the LTE terminal based on channel-sounding signal
The structural schematic diagram at end, as shown in figure 3, the terminal includes: computing module 31, sending module 32, receiving module 33, measurement module
34 and synchronization module 35.
Computing module 31 calculates the SRS resource of the terminal according to the mark of terminal and time；The terminal is in called
When state, the SRS resource of oneself is calculated according to the mark of oneself, calculated SRS resource is supplied to transmitting module；The end
When end is in caller state, according to the mark for the terminal that will be called, the SRS resource of target terminal is calculated, by the result of calculating
Notify receiving module and measurement module.
Sending module 32 is sent in the calculated SRS resource of computing module institute when the terminal is in called state
The SRS of oneself；When the terminal is in caller state, the information such as TA that measurement module is measured are sent to target terminal.
Receiving module 33 receives the SRS that called terminal issues when the terminal is in caller state；In called shape
The TA information and call information that calling terminal issues are received when state.
Measurement module 34 measures the transmission reaching on the time master of the called terminal when the terminal is in caller state
It is Timing Advance required for reception, measuring technique has a detailed description in 36 serial protocols of 3GPP, no longer heavy herein
It is multiple.
Synchronization module 35, according to the TA measured, adjusts the transmission mould of oneself when the terminal is in caller state
Block realizes that the transmission of oneself is synchronous with the reception of opposite end；When the terminal is in called state, according to receiving calling terminal
The calling of sending and TA adjust the launch time of oneself, keep the transmission of oneself synchronous with the reception of opposite end.
Each functional module of terminal provided in this embodiment can be used for executing shown in above-described embodiment one and embodiment two
The synchronous method process led directly between LTE terminal, concrete operating principle repeat no more, and are detailed in the description of embodiment of the method.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (9)
1. the synchronous method led directly between a kind of LTE terminal based on channel-sounding signal characterized by comprising
System is the unique mark of directintermination distribution, and mutually different SRS resource, the terminal is arranged according to the mark in terminal
The SRS signal of oneself is continuously sent out in oneself SRS resource；
When calling terminal needs to be communicated with target terminal, calling terminal according to the mark of target terminal to be called and when
Between, calculate the corresponding SRS resource of target terminal；
The SRS that calling terminal is issued by measurement target terminal calculates target terminal and sends required for data reaching on the time oneself
Timing Advance TA；
Target terminal adjusts the transmission lead of itself also according to the TA received, realizes that the transmission of target terminal and caller are whole
The reception at end is synchronous, to realize the mutually straight-through time synchronization of LTE terminal.
2. the method according to claim 1, wherein including:
The distribution of SRS resource and the mark of directintermination are related, be between terminal iidentification and SRS resource by one-to-one correspondence,
The SRS resource of the terminal can be calculated by terminal iidentification, and the SRS resource of different terminals is different；
Terminal continues to issue the SRS signal of oneself in the SRS resource of oneself.
3. the method according to claim 1, wherein including:
The position of terminal SRS resource be it is variable, but the position of SRS resource be can by the mark of the terminal and it is current when
Between calculate the position of target terminal SRS resource next time.
4. the method according to claim 1, wherein including:
The method that terminal measures SRS is identical with the method for base station measurement SRS, and terminal is after measuring TA value, immediately according to TA tune
The whole time oneself sent；To enable the transmission of oneself to reach target terminal on time, realize that the transmission of oneself and target are whole
The reception at end is synchronous.
5. the synchronous terminal led directly between a kind of LTE terminal based on channel-sounding signal characterized by comprising
System is that directintermination distributes unique identification, and mutually different SRS resource is arranged according to the mark in terminal；
Computing module: for according to target terminal to be called mark and the time, calculate the corresponding target terminal of the mark
SRS resource；
Sending module: the SRS of oneself is sent in the SRS resource of oneself for the terminal；Simultaneously oneself is needed to send
Information is sent to opposite end；
Receiving module: the information that SRS signal or opposite end for receiving target terminal send over；
Measurement module: the SRS measurement opposite end for being sent according to opposite end sends the Timing Advance TA needed；
Synchronization module: the sending time for adjusting oneself according to the TA for measuring or receiving.
6. terminal according to claim 5 characterized by comprising
Computing module calculates the SRS resource of the terminal according to the mark of terminal；When the terminal is in called state, according to certainly
Oneself mark calculates the SRS resource of oneself, and calculated SRS resource is supplied to transmitting module；The terminal is in caller shape
It when state, is identified according to the target terminal that will be called, calculates the SRS resource of target terminal, the result notice of calculating is received into mould
Block and measurement module.
7. terminal according to claim 5 characterized by comprising
Sending module when the terminal is in called state, in computing module send oneself in calculated SRS resource
SRS；When the terminal is in caller state, the TA that measurement module is measured is sent to target terminal.
8. terminal according to claim 5 characterized by comprising
Receiving module receives the SRS that called terminal issues when the terminal is in caller state；It is connect when being in called state
Receive the TA information and call information that calling terminal issues.
9. terminal according to claim 5 characterized by comprising
Synchronization module is when the terminal is in caller state, according to the TA measured, adjusts the sending module of oneself, realizes master
The transmission cried is synchronous with called reception；When the terminal is in called state, according to the calling of the calling terminal received
And TA, the launch time of oneself is adjusted, keeps called transmission synchronous with the reception of caller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510246341.1A CN104968044B (en) | 2015-05-15 | 2015-05-15 | The synchronous method and terminal led directly between LTE terminal based on channel-sounding signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510246341.1A CN104968044B (en) | 2015-05-15 | 2015-05-15 | The synchronous method and terminal led directly between LTE terminal based on channel-sounding signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104968044A CN104968044A (en) | 2015-10-07 |
| CN104968044B true CN104968044B (en) | 2019-03-05 |
Family
ID=54221957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510246341.1A Expired - Fee Related CN104968044B (en) | 2015-05-15 | 2015-05-15 | The synchronous method and terminal led directly between LTE terminal based on channel-sounding signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104968044B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110958708B (en) * | 2018-09-26 | 2022-02-08 | 维沃移动通信有限公司 | Signal transmission method, user equipment and network equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540634A (en) * | 2009-04-30 | 2009-09-23 | 华为技术有限公司 | Uplink synchronisation method, base station, terminal and communication system |
| CN103889071A (en) * | 2014-02-24 | 2014-06-25 | 北京邮电大学 | D2D communication synchronization, establishment and recovery method based on random access technology |
| CN104219758A (en) * | 2014-08-08 | 2014-12-17 | 中兴通讯股份有限公司 | D2D communication method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2496153B (en) * | 2011-11-02 | 2014-07-02 | Broadcom Corp | Device-to-device communications |
-
2015
- 2015-05-15 CN CN201510246341.1A patent/CN104968044B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540634A (en) * | 2009-04-30 | 2009-09-23 | 华为技术有限公司 | Uplink synchronisation method, base station, terminal and communication system |
| CN103889071A (en) * | 2014-02-24 | 2014-06-25 | 北京邮电大学 | D2D communication synchronization, establishment and recovery method based on random access technology |
| CN104219758A (en) * | 2014-08-08 | 2014-12-17 | 中兴通讯股份有限公司 | D2D communication method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104968044A (en) | 2015-10-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101123465B (en) | Method and device for synchronization of network devices in wireless communication system | |
| GB2581707A (en) | Timing and frame structure in an integrated access backhaul (IAB) network | |
| CN101123468B (en) | A method and system for synchronizing air interface synchronization between base stations | |
| CN102474836B (en) | Methods and device for transmitting timing aligning in a application component carrier Aggregation telecommunications system | |
| RU2419995C2 (en) | Generation of conclusion on applicability of upperlink synchronisation parametre | |
| EP3603325B1 (en) | Remote radio head equipped with user equipment terminal capability | |
| US10959048B2 (en) | System and method for simultaneous location tracking of multiple wireless terminals | |
| US10560214B2 (en) | Downlink and uplink communication path switching in a time-division duplex (TDD) distributed antenna system (DAS) | |
| CN105188128A (en) | Wireless time service and air interface synchronization method, base station, communication device and system | |
| CN110958681B (en) | Service transmission method and device | |
| CN106658696B (en) | Wireless time service method and system, terminal | |
| JP6132734B2 (en) | Time synchronization system and apparatus | |
| WO2017114055A1 (en) | Frame synchronization method, user equipment, and base station | |
| RU2014135515A (en) | DEVELOPMENT OF A BASE STATION, COMMUNICATION SYSTEM AND METHOD OF SYNCHRONIZATION | |
| CN103733699A (en) | Wireless station, wireless terminal, and transmission timing control method in wireless communication system | |
| WO2018141179A1 (en) | Systems and methods for cell range extension | |
| CN111294134B (en) | Time service method and device and electronic equipment | |
| CN103369662A (en) | Adapter, baseband processing unit and base station system | |
| CN104968044B (en) | The synchronous method and terminal led directly between LTE terminal based on channel-sounding signal | |
| US11963123B2 (en) | Transmission management | |
| JP6137646B2 (en) | Method and associated devices and systems for detecting uplink signals | |
| CN116647304A (en) | Time synchronization method, wireless communication device and system | |
| JP2015032997A (en) | Base station device, control method of the same, and program | |
| CN101136688A (en) | TD-SCDMA system extension unit synchronization method and device | |
| CN104852880A (en) | Synchronization method and terminal for direct communication between LTE terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| 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: 20190305 Termination date: 20210515 |