CN103973344B - Base station antenna selection method for D2D communication - Google Patents
Base station antenna selection method for D2D communication Download PDFInfo
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Abstract
The invention discloses a base station antenna selection method for D2D communication. A base station side is provided with M antennae based on the cellular link capacity maximization rule, and under the condition that all user devices are provided with single antennae, two antenna selection strategies are provided to achieve the purposes of cellular link capacity maximization and D2D link interference minimization. The method comprises the following steps that (1) the base station acquires state information of channels between each transmitting antenna to a cellular user and a D2D user at the end of each transmission period of time; (2) the base station selects the corresponding optimal transmitting antenna through the different antenna selection strategies according to the information acquired in the step (1); (3) signal transmission is carried out through the optimal transmitting antenna in the next transmission period of time, and the transmitting antennae are dynamically switched at the end of the transmission period of time according to the change of the channels. According to the method, the corresponding optimal transmitting antenna is selected based on different design rules to carry out signal transmission, so that the complexity of systematic design is lowered and the capacity of a cellular link is effectively increased.
Description
Technical field
The present invention relates to a kind of antenna for base station system of selection towards D2D communications, belong to communication technical field.
Background technology
Future cellular mobile communication will face super clear transmission of video and shared, game on line, the service based on geographical position,
And bulk device interconnection etc. various high-speed mobile Intemet data traffics.Due to improving cell throughout in 4G systems are sought
Method has reached performance boundary, it is necessary to greatly develop novel radio transmission technology and the network architecture under existing cell framework, wherein
Terminal room communication (D2D) technology towards cell mobile communication systems causes greatly concern in recent years.Based on cellular network
The general principle of terminal room communication is that the link of direct communication is set up between user terminal, and D2D communications need not be by base station
Turn, directly set up communication link between two users, and due to typically closer to the distance between user, link-quality is higher, can be real
High speed data transfer between existing user, is greatly reduced load of base station and improves cell throughput.
The result of study of radio communication shows in recent years, same in the transmitting terminal and receiving terminal of communication system, or this two ends
When using MIMO (Multi-Input Multi-Output, multiple-input and multiple-output) technology can increase power system capacity, improve pass
Defeated performance, and can be merged with other physical-layer techniques well, therefore as the key technology of 4G GSMs.But
It is that, when channel relevancy is strong, the diversity gain and spatial multiplexing gain brought by multipath channel are substantially reduced, and cause mimo system
Can decline to a great extent.
Emitting antenna selecting is exactly that channel condition information is judged, by Antenna Selection Technology select channel status compared with
The antenna of good (can be received) sends corresponding service signal, and by the antenna of other channel status bad (can not be received)
Close or be used only to send pilot tone without sending service signal.So in the worst cases, one has at least been ensure that
Antenna normal operating conditions, to keep the link of communication system unimpeded.Especially for the such power sensitive device of terminal, day line selection
Prior meaning is selected, radio circuit is the pith of UE (terminal device) cost, by Antenna Selection Technology, can dropped
Low amplifier quantity, reduces UE costs, reduces power consumption, implementation complexity reduction.In having the mimo system of day line options, it is necessary to
Several transmitting antennas are selected in all of transmitting antenna for transmission signal.In the selection course of transmitting antenna, it is necessary to
Compare the reception signal of selected each transmitting antenna and interference-to-noise ratio under various Transmit Antenna Selections (SINR,
Signal to Interference-Noise Ratio), and according to comparative result, antenna selecting party is determined according to certain criterion
Case；In some cases, such as transmitting terminal is using in the case of Adaptive Modulation, in addition it is also necessary to calculate the transmitting day for determining to use
The reception SINR of selected each transmitting antenna under line options scheme, to determine the modulation methods that selected each transmitting antenna is used
Formula.
What the studies above was both faced towards is the application scenarios of forth generation mobile communication (4G), does not consider that cell has D2D communications
Antenna for base station select permeability.The present invention combines the advantage of D2D communication systems and Antenna Selection Technology, logical for the movement of the 5th generation
Believe the demand of (5G), the method that design carries out day line options in base station is equipped with the D2D of multiple antennas communications.Based on as described above
Background, the present invention provides a kind of antenna selecting method based on D2D communications.
The content of the invention
Goal of the invention：For problems of the prior art and a kind of not enough, base towards D2D communications of present invention offer
Station antenna system of selection, the channel information that can be obtained according to base station is selected transmitting antenna, by optimal antenna to signal
Launched, so as to ensure system performance in various channel conditions, effectively improved overall system capacity.
Technical scheme：A kind of antenna for base station system of selection towards D2D communications, the applicable system of the method includes a base
Stand, a pair of D2D users and a phone user.Base station is equipped with M root antennas, and D2D user and phone user are equipped with single antenna.
Descending phase, phone user receives the data that base station sends, and the link that D2D user passes through to be joined directly together carries out D2D communications.Entirely
Transmitting procedure is divided into several transmission periods, and in each transmission period Mo, base station obtains each transmitting antenna and used to phone user and D2D
The channel condition information at family, base station selects corresponding optimal transmitting antenna according to different antenna selection strategies, in next transmission
Period, base station carries out signal transmitting according to the antenna selection result optimal transmitting antenna of selection.Specifically include following steps：
Step one, in each transmission period Mo, base station each transmitting antenna of acquisition to phone user and the channel status of D2D user
Information；
Step 2：Base station according to the channel coefficient matrix between the transmitting antenna and reception antenna obtained in step one,
Target is minimised as with cellular link maximum capacity and to D2D link interferences respectively, optimal transmitting antenna is selected；
For with cellular link maximum capacity be the maximized antenna selecting method of realization of goal power system capacity, hereinafter referred to as
For strategy one；To be minimised as the antenna selecting method of target to D2D link interferences, hereinafter referred to as tactful two.
Step 3：In next transmission period, strategy one or strategy two in step 2, the corresponding transmitting day of selection
Line carries out signal transmitting, and its channel condition information is fed back in each transmission time；
Step 4：In this transmission period Mo, return to step one, and sequentially implement subsequent step, according to each subscriber channel shape
The change of state carries out switching at runtime to base station selected transmitting antenna, and carries out next transmission stage, until whole transmitting procedure
Terminate.
Above-mentioned method, wherein, in the step one, in each transmission period Mo, base station obtains each transmitting antenna to honeybee
Nest user and the channel condition information of D2D user.Channel condition information therein is included by Base Transmitter antenna to phone user
The channel matrix of the channel coefficients composition between reception antenna, and by base station to the channel matrix D2D user.
Above-mentioned method, wherein, in the step 2, base station is according to the transmitting antenna obtained in step one and reception
Channel coefficient matrix between antenna, is minimised as target with cellular link maximum capacity and to D2D link interferences respectively, choosing
Select optimal transmitting antenna；Two kinds of antenna selection strategies are described below：
Strategy one：With cellular link maximum capacity as target, in the transmitting antenna of base station M, phone user is chosen
The maximum antenna of channel gain as transmitting antenna；
Strategy two：With base station to D2D user's minimum interference as target, in the transmitting antenna of base station M, choose D2D
The minimum antenna of the channel gain of user is used as transmitting antenna.
Above-mentioned method, wherein, in the step 3, in next transmission period, the strategy one in step 2
Or strategy two, select corresponding transmitting antenna to carry out signal transmitting, feed back its channel condition information in each transmission time.Specifically
For, according to strategy one, i.e., with cellular link maximum capacity as target, then selection has maximum channel in M antenna
The antenna of gain；According to strategy two, i.e., with base station to D2D user's minimum interference as target, then select right in M antenna
The minimum antenna of D2D user's interference.
Above-mentioned method, wherein, in the step 4, in this transmission period Mo, according to the change of each subscriber channel state
Change carries out switching at runtime to base station selected transmitting antenna, and in next transmission stage according to new antenna selection result by corresponding
Transmitting antenna carry out signal transmitting；The duration of each transmission time is according to cellular system local environment flexible configuration.
Beneficial effect：The antenna for base station system of selection towards D2D communications that the present invention is provided, has the following advantages that：
1. this method considered the characteristics of D2D communicates and Antenna Selection Technology advantage, in multiple transmitting antennas
One antenna of selection carries out the transmitting of signal, can reduce design complexities, effectively raises the total capacity of system.
2., process provides two kinds of strategies of day line options, each method is realized system and is always held from different angles
The maximization of amount, can be selected accordingly in different situations.
3. this method is simple to operate, can make full use of channel condition information, the carrying out day line options of self adaptation, at some
In the case of be greatly improved the total capacity of D2D communication systems, improve the utilization ratio of system resource.Brief description of the drawings
Fig. 1 is that Time segments division and implementation steps are transmitted in antenna selecting method of the present invention based on D2D communications
The flow chart of embodiment；
Fig. 2 is the stream of antenna selection strategy module one embodiment in antenna selecting method of the present invention based on D2D communications
Cheng Tu.
Specific embodiment
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention, after the present invention has been read, those skilled in the art are to various equivalences of the invention
The modification of form falls within the application appended claims limited range.
Towards the antenna for base station system of selection of D2D communications, following steps are specifically included：
Step one, in each transmission period Mo, base station each transmitting antenna of acquisition to phone user and the channel status of D2D user
Information；
Step 2：Base station according to the channel coefficient matrix between the transmitting antenna and reception antenna obtained in step one,
Target is minimised as with cellular link maximum capacity and to D2D link interferences respectively, optimal transmitting antenna is selected；
For with cellular link maximum capacity be the maximized antenna selecting method of realization of goal power system capacity, hereinafter referred to as
For strategy one；To be minimised as the antenna selecting method of target to D2D link interferences, hereinafter referred to as tactful two.
Step 3：In next transmission period, strategy one or strategy two in step 2, the corresponding transmitting day of selection
Line carries out signal transmitting, and its channel condition information is fed back in each transmission time；
Step 4：In this transmission period Mo, return to step one, and sequentially implement subsequent step, according to each subscriber channel shape
The change of state carries out switching at runtime to base station selected transmitting antenna, and carries out next transmission stage, until whole transmitting procedure
Terminate.
Above-mentioned method, wherein, in the step one, in each transmission period Mo, base station obtains each transmitting antenna to honeybee
Nest user and the channel condition information of D2D user.Channel condition information therein is included by Base Transmitter antenna to phone user
The channel matrix of the channel coefficients composition between reception antenna, and by base station to the channel matrix D2D user.
Above-mentioned method, wherein, in the step 2, base station is according to the transmitting antenna obtained in step one and reception
Channel coefficient matrix between antenna, is minimised as target with cellular link maximum capacity and to D2D link interferences respectively, choosing
Select optimal transmitting antenna；Two kinds of antenna selection strategies are described below：
Strategy one：With cellular link maximum capacity as target, in the transmitting antenna of base station M, phone user is chosen
The maximum antenna of channel gain as transmitting antenna；
Strategy two：With base station to D2D user's minimum interference as target, in the transmitting antenna of base station M, choose D2D
The minimum antenna of the channel gain of user is used as transmitting antenna.
Above-mentioned method, wherein, in the step 3, in next transmission period, the strategy one in step 2
Or strategy two, select corresponding transmitting antenna to carry out signal transmitting, feed back its channel condition information in each transmission time.Specifically
For, according to strategy one, i.e., with cellular link maximum capacity as target, then selection has maximum channel in M antenna
The antenna of gain；According to strategy two, i.e., with base station to D2D user's minimum interference as target, then select right in M antenna
The minimum antenna of D2D user's interference.
Above-mentioned method, wherein, in the step 4, in this transmission period Mo, according to the change of each subscriber channel state
Change carries out switching at runtime to base station selected transmitting antenna, and in next transmission stage according to new antenna selection result by corresponding
Transmitting antenna carry out signal transmitting；The duration of each transmission time is according to cellular system local environment flexible configuration.
Antenna for base station system of selection towards D2D communications provided in an embodiment of the present invention, the letter that can be obtained according to base station
Channel state information, according to different antenna for base station selection strategies, effectively selects corresponding optimal transmitting antenna to carry out signal
Transmitting, so as to significantly improve the total capacity of system.
Fig. 1 is the present invention towards transmission Time segments division and implementation steps in the antenna for base station system of selection of D2D communications
The flow chart of one embodiment.The method is comprised the following steps：
Step 101：In the transmission period 1, base station carries out signal transmitting according to current antenna selection result；
Step 102：At the end of the period 1 is transmitted, emitting antenna selecting is carried out.Base station obtains each transmitting antenna and is used to honeycomb
Family and the channel condition information of D2D user；Base station is according to two kinds of different corresponding optimal transmitting days of antenna selection strategy selection
Line；
Step 103：After step 102 end, into next transmission period 2, base station selects most according to antenna selection result
Excellent transmitting antenna carries out signal transmitting.
Fig. 2 is the stream of antenna selection strategy module one embodiment in antenna selecting method of the present invention based on D2D communications
Cheng Tu.Specifically include following steps：
Step 201：Base station obtains each transmitting antenna to phone user and the channel condition information of D2D user；According to plan
Slightly 1, then perform step 202；Using strategy 2, then step 203 is performed；
Step 202：Channel matrix [h from base station to phone userB1C, hB2C..., hBMC] in selection maximum norm corresponding to
Transmitting antenna, as optimal transmitting antenna, perform step 204；
Step 203：Channel matrix [h from base station to D2D userB1D, hB2D,..., hBMD] in selection minimum modulus corresponding to
Transmitting antenna, as optimal transmitting antenna, performs step 204；
Step 204：Signal transmitting is carried out using optimal antenna.
Claims (4)
1. a kind of antenna for base station system of selection towards D2D communications, it is characterised in that the method specifically includes following steps：
Step one：In each transmission period Mo, base station obtains each transmitting antenna and believes to the channel status of phone user and D2D user
Breath；
Step 2：Base station according to the channel condition information obtained in step one, respectively with cellular link maximum capacity and right
D2D link interferences are minimised as target, select optimal transmitting antenna；
For with cellular link maximum capacity be the maximized antenna selecting method of realization of goal power system capacity, hereinafter referred to as
Strategy one；To be minimised as the antenna selecting method of target to D2D link interferences, hereinafter referred to as tactful two；
Step 3：In next transmission period, strategy one or strategy two in step 2 select corresponding transmitting antenna to enter
Row signal is launched, and its channel condition information is fed back in each transmission time；
Step 4：In this transmission period Mo, return to step one, and sequentially implement subsequent step, according to each subscriber channel state
Change carries out switching at runtime to base station selected transmitting antenna, and carries out next transmission stage, until whole transmitting procedure terminates；
In step 2, base station is divided according to the channel coefficient matrix between the transmitting antenna and reception antenna obtained in step one
Target is not minimised as with cellular link maximum capacity and to D2D link interferences, optimal transmitting antenna is selected；Two kinds of day line selections
Strategy is selected to be described below：
Strategy one：With cellular link maximum capacity as target, in the transmitting antenna of base station M, the letter of phone user is chosen
Gain maximum antenna in road is used as transmitting antenna；
Strategy two：With base station to D2D user's minimum interference as target, in the transmitting antenna of base station M, choose D2D user
The minimum antenna of channel gain as transmitting antenna.
2. the antenna for base station system of selection towards D2D communications according to claim 1, it is characterised in that：In step one,
Each transmission period Mo, base station obtains each transmitting antenna to phone user and the channel condition information of D2D user；
Channel condition information includes the channel being made up of to the channel coefficients phone user's reception antenna Base Transmitter antenna
Matrix, and by base station to the channel matrix D2D user.
3. the antenna for base station system of selection towards D2D communications according to claim 1, it is characterised in that：In step 3,
In next transmission period, strategy one or strategy two in step 2 select corresponding transmitting antenna to carry out signal transmitting,
Each transmission time feeds back its channel condition information.
4. the antenna for base station system of selection towards D2D communications according to claim 1, it is characterised in that：In step 4,
This transmission period Mo, the change according to each subscriber channel state carries out switching at runtime to base station selected transmitting antenna, and under
One transmission stage carried out signal transmitting according to new antenna selection result by corresponding transmitting antenna；The duration of each transmission time
Configured according to cellular system local environment.
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| CN106911364B (en) * | 2015-12-18 | 2020-07-03 | 上海诺基亚贝尔股份有限公司 | Method and device for allocating remote antennas in cloud wireless access network |
| WO2017166189A1 (en) * | 2016-03-31 | 2017-10-05 | 华为技术有限公司 | Method for transmitting data between user equipments, and user equipment and base station |
| WO2020199075A1 (en) * | 2019-04-01 | 2020-10-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Base stations and methods for wireless communication networks |
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| CN102882570A (en) * | 2012-09-28 | 2013-01-16 | 东南大学 | Optimum transceiving combined processing method for communication among equipment in mobile communication network |
| CN103354641A (en) * | 2013-07-20 | 2013-10-16 | 西安电子科技大学 | Resource distribution method of D2D communication in LTE-A cellular network |
| CN103596120A (en) * | 2013-10-23 | 2014-02-19 | 浙江大学 | D2D communication method in macro cell and small cell heterogeneous network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2724480B1 (en) * | 2011-06-21 | 2015-08-19 | Telefonaktiebolaget L M Ericsson (publ) | Selecting uplink multi-antenna transmission to enhance coverage |
| US9635618B2 (en) * | 2012-01-03 | 2017-04-25 | Lg Electronics Inc. | Method for setting downlink transmission power in wireless access system, and apparatus therefor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882570A (en) * | 2012-09-28 | 2013-01-16 | 东南大学 | Optimum transceiving combined processing method for communication among equipment in mobile communication network |
| CN103354641A (en) * | 2013-07-20 | 2013-10-16 | 西安电子科技大学 | Resource distribution method of D2D communication in LTE-A cellular network |
| CN103596120A (en) * | 2013-10-23 | 2014-02-19 | 浙江大学 | D2D communication method in macro cell and small cell heterogeneous network |
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