CN104717633A - Direct mode operation (DMO) transmission method - Google Patents
Direct mode operation (DMO) transmission method Download PDFInfo
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- CN104717633A CN104717633A CN201310674112.0A CN201310674112A CN104717633A CN 104717633 A CN104717633 A CN 104717633A CN 201310674112 A CN201310674112 A CN 201310674112A CN 104717633 A CN104717633 A CN 104717633A
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Abstract
The invention discloses a direct mode operation (DMO) transmission method. The method comprises steps: as for data which currently need to be transmitted to a slave DMO terminal, a main-control DMO terminal adopts a DMO special wireless frame format, corresponding DMO wireless frames are generated and transmitted to the slave DMO terminal. When the data include user DMO service information, the generation comprises steps: a mode of carrying out frequency division multiplexing on an enhanced physical downlink control channel (ePDCCH) and user signals is adopted and the ePDCCH adopts a centralized resource mapping mode, the DMO service information and the corresponding control information are modulated according to an NxDFTSC-FDMA modulation mode. By adopting the method of the invention, data transmission between the DMO terminals can be realized.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to the transmission method under direct mode operation in group system (Direct ModeOperation, DMO).
Background technology
DMO technology is introduced at present in the group system realized based on LTE system.Terminal network-off direct-passing pattern in group system refers to direct communication between two or more terminals, without base station and forwarded.The communication range of DMO pattern both can be in the region of the network coverage, also can be that the network coverage is beyond one's reach region, and thus DMO pattern is the effective expansion to original system communication.
Terminal network-off direct-passing is one of featured function of professional trunking communication.For the cluster network based on LTE, terminal (DM-UE) communication mode of direct mode operation is DMO Basic Reference Model, is applicable to use communication that is point-to-point between the DM-UE of direct mode air interface or point-to-multipoint.The DM-UE of reference synchronization is wherein provided to be defined as " main controlling user "; Any DM-UE synchronous with " main controlling user " is " secondary user.This model is that community is moved back in the control range of Fu Huobu community completely.
Another scene, when DW-UE is in two monitoring mode, the terminal periodic of direct mode operation monitors Uu interface channel and DM-Uu interface channel, and preferential supervision Uu interface channel.By the communication of DM-Uu interface and DM-UE, and periodic surveillance Uu interface channel; Communicated with eNB by Uu interface, and periodic surveillance DM-Uu channel.In general, the parallel communications of DM-Uu and Uu interface is supported in when DW-UE is different.
Consider the particularity of DMO transfer of data, when DMO terminal room carries out transfer of data, directly can not adopt the radio frames of existing LTE system.Ananlysis of main cause is as follows:
1, the OFDM modulation method peak-to-average force ratio of LTE standard employing is high, like this, just produces the interference of larger terminal room, affects the signal cover of handheld terminal, be not suitable for the transfer of data of DMO terminal room.
2, the Physical Downlink Control Channel (PDCCH) of LTE is total system bandwidth modulation, and DMO terminal traffic is carried out in limited frequency band.Like this, for the DMO system that there is calling terminal frequent changes situation, DMO terminal is at each subframe Whole frequency band demodulation PDCCH, the unnecessary waste of terminal processes resource will be caused, reduce effective coverage distance, increase the processing delay of terminal, therefore, in LTE radio frames, the modulation system of PDCCH is not suitable for the transfer of data of DMO.
Summary of the invention
In view of this, main purpose of the present invention is the transmission method providing a kind of direct mode operation, and the method is applicable to the transfer of data of DMO terminal room.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A transmission method for direct mode operation, comprising:
Need for current the data being transferred to subordinate DMO terminal, master control direct mode operation DMO terminal, adopt DMO private radio frame format, generate corresponding DMO radio frames and send to subordinate DMO terminal;
Wherein, when described data comprise the DMO business information of user, described generation comprises:
The Physical Downlink Control Channel ePDCCH channel of enhancing and user traffic channel is adopted to carry out the mode of frequency division multiplexing, the mode that ePDCCH channel adopts centralized resources to map, and ePDCCH, between Physical Broadcast Channel PBCH and the Traffic Channel of each user according to NxDFT SC-FDMA modulate mode, described DMO business information and corresponding control information are modulated.
In sum, the transmission method of the direct mode operation that the present invention proposes, signal peak-to-average ratio can be reduced, improve power amplification efficiency and coverage distance, subordinate DMO terminal can also be made not need the ePDCCH channel of demodulation Whole frequency band simultaneously, save the process resource of DMO terminal, therefore, the present invention is applicable to the transfer of data of DMO terminal room.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with specific embodiment, the present invention is described in further detail.
Core concept of the present invention is: to ePDCCH and subscriber signal, adopt the mode that frequency division multiplexing and ePDCCH channel adopt centralized resources to map, subordinate DMO terminal is made not need demodulation Whole frequency band PDCCH channel, get final product proper communication, and adopt the modulation system (i.e. NxDFT SC-FDMA) of multiple DFT, make main control terminal for the different wireless channel environment of subordinate DMO terminal, send the business datum of different MCS, thus can signal peak-to-average ratio be reduced, improve power amplification efficiency and coverage distance.
The embodiment of the present invention mainly comprises following content:
Need for current the data being transferred to subordinate DMO terminal, master control direct mode operation DMO terminal adopts DMO private radio frame format, generates corresponding DMO radio frames and sends to subordinate DMO terminal.
Wherein, when described data comprise the business information of user, when carrying out the generation of described radio frames, need to adopt the Physical Downlink Control Channel ePDCCH channel strengthened and the mode that user traffic channel carries out frequency division multiplexing, ePDCCH channel adopts centralized resources to map, and according to NxDFT SC-FDMA modulation system between the Traffic Channel of ePDCCH, PBCH and each user, described DMO business information and corresponding control information are modulated.
In the above-mentioned methods, the mode adopting ePDCCH and subscriber signal to carry out frequency division multiplexing and ePDCCH channel to adopt centralized resources to map, subordinate DMO terminal can be made not need demodulation Whole frequency band PDCCH channel, only need the ePDCCH in first demodulation terminal call occupied bandwidth can know whether the data of oneself, realize proper communication.Therefore the process resource of DMO terminal can be saved; Meanwhile, also help main control terminal, in the whole bandwidth taken, frequency selection scheduling is carried out to different subordinate UE.
In addition, here adopt the SC-FDMA(NxDFT SC-FDMA of sub-clustering) modulation system, in sub-clustering SC-FDMA, DFT exports sampling and is divided into N number of subgroup, correspond respectively to the Traffic Channel of ePDCCH, PBCH and each user, that is, at synchronization, between the Traffic Channel of ePDCCH, PBCH and different user, adopt DFT SC-FDMA mode to encode respectively.So, main control terminal can be made for the different wireless channel environment of subordinate DMO terminal, send the business datum of different MCS, can signal peak-to-average ratio be reduced, improve power amplification efficiency and coverage distance.
Preferably, when described data comprise the information of Physical Broadcast Channel PBCH, when carrying out the generation of described radio frames, 6, the centre Resource Block that the downlink synchronization slot of special subframe in described radio frames is corresponding can be utilized, carry the information of described PBCH.
So, PBCH character position is moved on to special subframe DwPTS position, more PBCH can be expanded and carry number of symbols, carry the extend information of PBCH.
Preferably, when described data comprise the DMO business information of the information of Physical Broadcast Channel PBCH and user simultaneously, when carrying out the generation of described radio frames, the time-multiplexed mode of PBCH and DMO Traffic Channel can be adopted, the information of described PBCH and the business information of user are modulated.So, the power spectral density and coverage distance that transmit can be improved on the one hand.On the other hand, base band signal process and buffer efficiency not high problem when two kinds of Signal averaging can be avoided to launch.
Consider after introducing DMO technology, system is by existence two kinds of signals, and one is DMO signal, and one is LTE base station signal, and DMO terminal needs to identify these two kinds of signals, to realize the support to two monitoring mode.In order to improve the recognition efficiency to two kinds of signals in the present invention, reduce the mutual interference between LTE base station signal, when sending synchronizing signal, the running time-frequency resource identical with LTE base station and send mode can be adopted, such DMO terminal only needs to monitor the synchronizing signal of same position, according to the classification belonging to the synchronizing signal detected, distinguish radio frames or the radio frames of DMO terminal transmission that the radio frames be currently received is base station transmission.Particularly, this purpose is realized by following method.
Namely, when described data comprise DMO synchronizing signal, when carrying out the generation of described radio frames, 6, the centre Physical Resource Block of the 3rd OFDM symbol of special subframe in described radio frames can be utilized, carry the main synchronous reference signal PSS of DMO, and described in cycle of carrying be 5ms, the described PSS at every turn carried; Utilize last OFDM symbol of subframe 0 in described radio frames, carry the auxiliary synchronous reference signal SSS of DMO.
Preferably, when described data comprise Traffic Channel demodulation reference mark, when carrying out the generation of described radio frames, the mode identical with the time-frequency location that TDD-LTE system uplink reference symbol takies can be adopted, described Traffic Channel demodulation reference mark is carried in described radio frames, with compatibility existing LTE chip for cell phone hardware circuit, reduce power consumption and development cost.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a transmission method for direct mode operation, is characterized in that, comprising:
Need for current the data being transferred to subordinate direct mode operation DMO terminal, master control DMO terminal adopts DMO private radio frame format, generates corresponding DMO radio frames and sends to subordinate DMO terminal;
Wherein, when described data comprise the DMO business information of user, described generation comprises:
The Physical Downlink Control Channel ePDCCH channel of enhancing and user traffic channel is adopted to carry out the mode of frequency division multiplexing, the mode that ePDCCH channel adopts centralized resources to map, and ePDCCH, between Physical Broadcast Channel PBCH and the Traffic Channel of each user according to NxDFT SC-FDMA modulate mode, described DMO business information and corresponding control information are modulated.
2. method according to claim 1, is characterized in that, when described data comprise the information of Physical Broadcast Channel PBCH, described generation comprises further:
Utilize 6, the centre Physical Resource Block that the downlink synchronization slot of special subframe in described radio frames is corresponding, carry the information of described PBCH.
3. method according to claim 2, is characterized in that, when described data comprise the DMO business information of the information of PBCH and user simultaneously, described generation comprises further:
Adopt PBCH and Traffic Channel to carry out time-multiplexed mode, the information of described PBCH and the DMO business information of user are modulated.
4. method according to claim 1, is characterized in that, when described data comprise DMO synchronizing signal, described generation comprises further:
Utilize 6, the centre Physical Resource Block of the 3rd OFDM symbol of special subframe in described radio frames, carry the main synchronous reference signal PSS of DMO, and described in cycle of carrying be 5ms, the described PSS at every turn carried;
Utilize last OFDM symbol of subframe 0 in described radio frames, carry the auxiliary synchronous reference signal SSS of DMO.
5. method according to claim 1, is characterized in that, when described data comprise Traffic Channel demodulation reference mark, described generation comprises further:
Adopt the mode identical with the time-frequency location that TDD-LTE system uplink reference symbol takies, in described radio frames, carry described Traffic Channel demodulation reference mark.
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| CN201310674112.0A CN104717633B (en) | 2013-12-11 | 2013-12-11 | The transmission method of direct mode operation |
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| CN201310674112.0A CN104717633B (en) | 2013-12-11 | 2013-12-11 | The transmission method of direct mode operation |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102395206A (en) * | 2011-11-08 | 2012-03-28 | 电信科学技术研究院 | Transmission method and equipment for downside control information |
| WO2012046173A1 (en) * | 2010-10-04 | 2012-04-12 | Nokia Corporation | Feedback mapping for d2d control signals |
| CN102685912A (en) * | 2011-03-17 | 2012-09-19 | 中兴通讯股份有限公司 | Method and system for implementing direct communication between terminals |
| CN103067876A (en) * | 2011-10-18 | 2013-04-24 | 普天信息技术研究院有限公司 | Method for transmitting control information under direct mode operation (DMO) and system thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012046173A1 (en) * | 2010-10-04 | 2012-04-12 | Nokia Corporation | Feedback mapping for d2d control signals |
| CN102685912A (en) * | 2011-03-17 | 2012-09-19 | 中兴通讯股份有限公司 | Method and system for implementing direct communication between terminals |
| CN103067876A (en) * | 2011-10-18 | 2013-04-24 | 普天信息技术研究院有限公司 | Method for transmitting control information under direct mode operation (DMO) and system thereof |
| CN102395206A (en) * | 2011-11-08 | 2012-03-28 | 电信科学技术研究院 | Transmission method and equipment for downside control information |
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Granted publication date: 20180330 Termination date: 20211211 |