CN104717633B

CN104717633B - The transmission method of direct mode operation

Info

Publication number: CN104717633B
Application number: CN201310674112.0A
Authority: CN
Inventors: 强剑锋; 王栋; 赵顾良; 陈哲; 王岚; 陈永
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Potevio Institute of Technology Co Ltd
Priority date: 2013-12-11
Filing date: 2013-12-11
Publication date: 2018-03-30
Anticipated expiration: 2033-12-11
Also published as: CN104717633A

Abstract

This application discloses a kind of transmission method of direct mode operation, including：Data for being currently needed for being transferred to subordinate DMO terminals, master control direct mode operation DMO terminals, using DMO private radio frame formats, generate corresponding DMO radio frames and be sent to subordinate DMO terminals.Wherein, when the data include the DMO business information of user, the generation includes：By the way of Physical Downlink Control Channel ePDCCH channels and subscriber signal the progress frequency division multiplexing of enhancing, and ePDCCH channels are by the way of centralized resources mapping, according to NxDFT SC FDMA modulation systems, the DMO business information and corresponding control information are modulated.Using the present invention, it is possible to achieve the data transfer of DMO terminal rooms.

Description

The transmission method of direct mode operation

Technical field

The present invention relates to mobile communication technology, more particularly to direct mode operation in group system（Direct Mode Operation, DMO）Under transmission method.

Background technology

DMO technologies are introduced in the group system realized based on LTE system at present.Terminal off-grid in group system is straight Logical pattern refers to direct communication between two or more terminals, without base station and forwarded.The communication model of DMO patterns It both can be region that in the region of the network coverage or the network coverage is unable to reach to enclose, thus DMO patterns are to original There is effective expansion that system communicates.

Terminal network-off direct-passing is one of featured function of professional cluster communication.For the cluster network based on LTE, mould is led directly to The terminal of formula（DM-UE）Communication mode is DMO Basic Reference Models, be suitable for use with direct mode air interface DM-UE it Between point-to-point or point-to-multipoint communication.The DM-UE for wherein providing reference synchronization is defined as " main controlling user "；It is any and " main The synchronous DM-UE of control user " is " secondary user.The model is that cell moves back clothes or not in cell control range completely.

Another scene, when DW-UE is in double monitoring modes, the terminal periodic monitoring Uu interface channels of direct mode operation With DM-Uu interface channels, and preferential monitoring Uu interface channels.By DM-Uu interfaces and DM-UE communication, and periodically supervise Depending on Uu interface channels；Communicated by Uu interfaces with eNB, and periodic surveillance DM-Uu channels.In general, branch during DW-UE differences Hold the parallel communications in DM-Uu and Uu interfaces.

In view of the particularity of DMO data transfers, existing LTE can not be directly used when DMO terminal rooms carry out data transmission The radio frames of system.Ananlysis of main cause is as follows：

1st, the OFDM modulation method peak-to-average force ratio that LTE standard uses is high, so, just produces the interference of larger terminal room, shadow The signal cover of handheld terminal is rung, is not suitable for the data transfer of DMO terminal rooms.

2nd, LTE Physical Downlink Control Channel（PDCCH）It is total system bandwidth modulation, and DMO terminal traffics are that having Limit what is carried out in frequency band.So, for the DMO systems of calling terminal frequent changes situation be present, DMO terminals are complete in each subframe Frequency band demodulates PDCCH, will cause the unnecessary waste of terminal processes resource, reduces effective coverage distance, increase the processing of terminal Time delay, therefore, DMO data transfer is not suitable for PDCCH modulation system in LTE radio frames.

The content of the invention

In view of this, it is a primary object of the present invention to provide a kind of transmission method of direct mode operation, this method is applied to The data transfer of DMO terminal rooms.

In order to achieve the above object, technical scheme proposed by the present invention is：

A kind of transmission method of direct mode operation, including：

Data for being currently needed for being transferred to subordinate DMO terminals, master control direct mode operation DMO terminals, using the special nothings of DMO Line frame format, generate corresponding DMO radio frames and be sent to subordinate DMO terminals；

Wherein, when the data include the DMO business information of user, the generation includes：

By the way of the Physical Downlink Control Channel ePDCCH channels and user traffic channel of enhancing carry out frequency division multiplexing, EPDCCH channels are by the way of centralized resources mapping, and ePDCCH, Physical Broadcast Channel PBCH and each user business Between channel in the way of NxDFT SC-FDMA are modulated, the DMO business information and corresponding control information are adjusted System.

In summary, the transmission method of direct mode operation proposed by the present invention, signal peak-to-average ratio can be reduced, improves power amplifier effect Rate and coverage distance, while it is also possible that subordinate DMO terminals need not demodulate the ePDCCH channels of Whole frequency band, it is whole to save DMO The process resource at end, therefore, the present invention are applied to the data transfer of DMO terminal rooms.

Embodiment

To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment to the present invention It is described in further detail.

The present invention core concept be：To ePDCCH and subscriber signal, used using frequency division multiplexing and ePDCCH channels The mode of centralized resources mapping so that subordinate DMO terminals need not demodulate Whole frequency band PDCCH channels, you can proper communication, and And using multiple DFT modulation system（That is NxDFT SC-FDMA）, make main control terminal for different wireless of subordinate DMO terminals Channel circumstance, different MCS business datum is sent, so as to reduce signal peak-to-average ratio, improve power amplification efficiency and coverage distance.

The embodiment of the present invention mainly includes herein below：

Data for being currently needed for being transferred to subordinate DMO terminals, master control direct mode operation DMO terminals use the special nothings of DMO Line frame format, generate corresponding DMO radio frames and be sent to subordinate DMO terminals.

Wherein, when the business information of data including user, when carrying out the generation of the radio frames, it is necessary to using The Physical Downlink Control Channel ePDCCH channels of enhancing carry out frequency division multiplexing, ePDCCH channels using concentration with user traffic channel According to NxDFT SC-FDMA modulation methods between the mode of formula resource impact, and the Traffic Channel of ePDCCH, PBCH and each user Formula, the DMO business information and corresponding control information are modulated.

In the above-mentioned methods, frequency division multiplexing and ePDCCH channels are carried out using concentration using ePDCCH and subscriber signal The mode of formula resource impact, subordinate DMO terminals can be caused to demodulate Whole frequency band PDCCH channels, it is only necessary to which first demodulation is eventually EPDCCH in end calling occupied bandwidth can know whether the data of oneself, realize proper communication.Therefore DMO can be saved The process resource of terminal；Meanwhile also help main control terminal line frequency is entered to different subordinate UE in whole bandwidth of occupancy and recruit Degree.

In addition, the SC-FDMA of sub-clustering is used here（NxDFT SC-FDMA）Modulation system, in sub-clustering SC-FDMA, DFT output samplings are divided into N number of subgroup, correspond respectively to the Traffic Channel of ePDCCH, PBCH and each user, that is to say, that In synchronization, DFT SC-FDMA modes are respectively adopted between ePDCCH, PBCH and the Traffic Channel of different user and encode. In this way, main control terminal can be made to be directed to the different wireless channel environment of subordinate DMO terminals, different MCS business datum is sent, can To reduce signal peak-to-average ratio, power amplification efficiency and coverage distance are improved.

It is preferred that when the data include Physical Broadcast Channel PBCH information, the generation of the radio frames is being carried out When, middle 6 resource blocks corresponding to the downlink synchronization slot of special subframe in the radio frames can be utilized, carry the PBCH Information.

In this way, PBCH character positions are moved on into special subframe DwPTS positions, more PBCH carryings symbolic numbers can be extended Mesh, carry PBCH extension information.

It is preferred that when the data while the information including Physical Broadcast Channel PBCH and the DMO business information of user, When carrying out the generation of the radio frames, PBCH and the time-multiplexed mode of DMO Traffic Channels can be used, to the PBCH's Information and the business information of user are modulated.In this way, on the one hand can improve transmission signal power spectral density and covering away from From.On the other hand, base band signal process and the problem of not high buffer efficiency when can avoid the transmitting of two kinds of Signal averagings.

After introducing DMO technologies, for system there will be two kinds of signals, one kind is DMO signals, and one kind is LTE base station Signal, DMO terminals need that both signals are identified, to realize the support to double monitoring modes.In order to carry in the present invention The high recognition efficiency to two kinds of signals, reduce interfering between LTE base station signal, can be with when sending synchronizing signal Only need to enter the synchronizing signal of same position using with LTE base station identical running time-frequency resource and sending method, such DMO terminals Row monitoring, the classification according to belonging to the synchronizing signal detected, it is that base station is sent to distinguish the radio frames being currently received The radio frames that radio frames or DMO terminals are sent.Specifically, this purpose can be realized by following methods.

That is, when the data include DMO synchronizing signals, when carrying out the generation of the radio frames, can utilize described The Physical Resource Block of centre 6 of 3rd OFDM symbol of special subframe in radio frames, carry DMO main synchronous reference signal PSS, and the cycle of the carrying is 5ms, the PSS carried every time；Utilize last of subframe 0 in the radio frames OFDM symbol, carry DMO auxiliary synchronous reference signal SSS.

It is preferred that when the data include Traffic Channel demodulation reference mark, when carrying out the generation of the radio frames, The time-frequency location identical mode taken with TDD-LTE system uplink reference symbol can be used, is carried in the radio frames The Traffic Channel demodulation reference mark, with compatible existing LTE chips for cell phone hardware circuit, reduce power consumption and development cost.

In summary, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention. Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's Within protection domain.

Claims

A kind of 1. transmission method of direct mode operation, it is characterised in that including：

Data for being currently needed for being transferred to subordinate direct mode operation DMO terminals, master control DMO terminals use DMO private radio frames Form, generate corresponding DMO radio frames and be sent to subordinate DMO terminals；

Wherein, when the data include the DMO business information of user, the generation includes：

By the way of the Physical Downlink Control Channel ePDCCH channels and user traffic channel of enhancing carry out frequency division multiplexing, EPDCCH channels are by the way of centralized resources mapping, and ePDCCH, Physical Broadcast Channel PBCH and each user business Between channel in the way of the single-carrier frequency division multiple access NxDFT SC-FDMA modulation of more DFTs, to the DMO Business information and corresponding control information are modulated.
2. according to the method for claim 1, it is characterised in that when the data include Physical Broadcast Channel PBCH information When, the generation further comprises：

Using 6 Physical Resource Block among corresponding to the downlink synchronization slot of special subframe in the radio frames, described in carrying PBCH information.
3. according to the method for claim 2, it is characterised in that as the data information including PBCH and user simultaneously During DMO business information, the generation further comprises：

Time-multiplexed mode, the DMO business information of information and user to the PBCH are carried out using PBCH and Traffic Channel It is modulated.
4. according to the method for claim 1, it is characterised in that when the data include DMO synchronizing signals, the generation Further comprise：

Using the Physical Resource Block of centre 6 of the 3rd OFDM symbol of special subframe in the radio frames, the master for carrying DMO is same Reference signal PSS is walked, and the cycle of the carrying is 5ms；

Using last OFDM symbol of subframe 0 in the radio frames, DMO auxiliary synchronous reference signal SSS is carried.
5. according to the method for claim 1, it is characterised in that when the data include Traffic Channel demodulation reference mark When, the generation further comprises：

Using the time-frequency location identical mode taken with TDD-LTE system uplink reference symbol, carried in the radio frames The Traffic Channel demodulation reference mark.