CN103973344A - 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 communication, belong to communication technical field.
Background technology
Following cellular mobile communication by facing super clear transmission of video and share, game on line, the multiple high-speed mobile internet data business such as service and magnanimity devices interconnect based on geographical position.Because the method that improves cell throughout in the 4G of battalion system has reached performance boundary under the framework of existing community, need to greatly develop novel radio transmission technology and the network architecture, wherein cause in recent years very big concern towards terminal room communication (D2D) technology of cell mobile communication systems.The general principle of the terminal room communication based on cellular network is between user terminal, to set up the link of direct communication, D2D communication does not need by base station transfer, between two users, directly set up communication link, and due to general close together between user, link-quality is higher, can realize high speed data transfer between user, significantly reduce load of base station and improve community throughput.
The result of study of radio communication shows in recent years, at transmitting terminal and the receiving terminal of communication system, or these two ends are used MIMO (Multi-Input Multi-Output simultaneously, multiple-input and multiple-output) technology can increase power system capacity, improve transmission performance, and can merge with other physical-layer techniques well, therefore become the key technology of 4G mobile communication system.But in the time that channel relevancy is strong, the diversity gain and the spatial multiplexing gain that are brought by multipath channel reduce greatly, cause declining to a great extent of mimo system performance.
Emitting antenna selecting judges channel condition information exactly, by Antenna Selection Technology selective channel state better the antenna of (can be accepted) send corresponding service signal, and the antenna of bad other channel statuss (can not be accepted) cut out or is just used for sending pilot tone and do not send service signal.Under worst case, at least can ensure an antenna normal operating conditions like this, to keep the link of communication system unimpeded.For the such power sensitive device of terminal, a day line options has prior meaning especially, and radio circuit is the pith of UE (terminal equipment) cost, by Antenna Selection Technology, can step-down amplifier quantity, reduce UE cost, reduce power consumption, implementation complexity reduces.Having in the mimo system of day line options, need in all transmitting antennas, select several transmitting antennas to be used for transmitting.In the selection course of transmitting antenna, reception signal and the interference-to-noise ratio (SINR of selected each transmitting antenna under need to more various Transmit Antenna Selections, Signal to Interference-Noise Ratio), and according to comparative result, determine antenna selecting plan according to certain criterion; In some cases, such as transmitting terminal adopts in the situation of Adaptive Modulation, also need to calculate the reception SINR of determine selecteed each transmitting antenna under the Transmit Antenna Selection adopting, with the modulation system of determining that selecteed each transmitting antenna adopts.
Above-mentioned research all towards be the application scenarios of the 4th third-generation mobile communication (4G), do not consider that community exists the antenna for base station of D2D communication to select problem.The present invention is in conjunction with the advantage of D2D communication system and Antenna Selection Technology, and for the demand of the 5th third-generation mobile communication (5G), the method for day line options is carried out in design in base station is equipped with the D2D communication of many antennas.Based on background as above, the present invention provides a kind of antenna selecting method based on D2D communication.
Summary of the invention
Goal of the invention: for problems of the prior art and deficiency, the invention provides a kind of antenna for base station system of selection towards D2D communication, the channel information that can obtain according to base station is selected transmitting antenna, by optimal antenna, signal is launched, thereby the performance of guarantee system under various channel conditions, effectively improves overall system capacity.
Technical scheme: a kind of antenna for base station system of selection towards D2D communication, the applicable system of the method comprises a base station, a pair of D2D user and a phone user.Base station is equipped with M root antenna, and D2D user and phone user are equipped with single antenna.In the descending stage, phone user receives the data that base station sends, and D2D user carries out D2D communication by direct connected link.Whole transmitting procedure is divided into several transmission periods, in each transmission period end, base station obtains the channel condition information of each transmitting antenna to phone user and D2D user, corresponding optimum transmitting antenna is selected according to different antenna selection strategies in base station, in next transmission period, base station selects optimum transmitting antenna to carry out signal transmitting according to antenna selection result.Specifically comprise the following steps:
Step 1, in each transmission period end, base station obtains the channel condition information of each transmitting antenna to phone user and D2D user;
Step 2: base station, according to the channel coefficient matrix between the transmitting antenna obtaining in step 1 and reception antenna, is minimised as target with cellular link maximum capacity with to D2D link interference respectively, selects optimum transmitting antenna;
For taking cellular link maximum capacity as the maximized antenna selecting method of realization of goal power system capacity, be below referred to as strategy one; D2D link interference is minimised as to the antenna selecting method of target, be below referred to as strategy two.
Step 3: in next transmission period, according to the strategy one in step 2 or strategy two, select corresponding transmitting antenna to carry out signal transmitting, feed back its channel condition information at each transmission time;
Step 4: in this transmission period end, return to step 1, and implement subsequent step in turn, according to the variation of each subscriber channel state, base station selected transmitting antenna is dynamically switched, and carry out next transmit stage, until whole transmitting procedure finishes.
Above-mentioned method, wherein, in described step 1, in each transmission period end, base station obtains the channel condition information of each transmitting antenna to phone user and D2D user.Channel condition information wherein comprises the channel matrix being made up of to the channel coefficients phone user's reception antenna base station transmit antennas, and by base station to the channel matrix D2D user.
Above-mentioned method, wherein, in described step 2, base station is according to the channel coefficient matrix between the transmitting antenna obtaining in step 1 and reception antenna, be minimised as target with cellular link maximum capacity with to D2D link interference respectively, select optimum transmitting antenna; Two kinds of antenna selection strategies are described below:
Strategy one: taking cellular link maximum capacity as target, in a base station M transmitting antenna, choose phone user's the antenna of channel gain maximum as transmitting antenna;
Strategy two: be target taking base station to D2D user's minimum interference, in a base station M transmitting antenna, choose D2D user's the antenna of channel gain minimum as transmitting antenna.
Above-mentioned method, wherein, in described step 3, in next transmission period, according to the strategy one in step 2 or strategy two, selects corresponding transmitting antenna to carry out signal transmitting, feeds back its channel condition information at each transmission time.Specifically, if adopt strategy one, taking cellular link maximum capacity as target, in M antenna, select to have the antenna of maximum channel gain; If adopt strategy two, be target taking base station to D2D user's minimum interference, in M antenna, select D2D user to disturb minimum antenna.
Above-mentioned method, wherein, in described step 4, in this transmission period end, according to the variation of each subscriber channel state, base station selected transmitting antenna is dynamically switched, and carry out signal transmitting according to new antenna selection result by corresponding transmitting antenna in next transmit stage; The duration in each transmission time is according to cellular system environment flexible configuration of living in.
Beneficial effect: the antenna for base station system of selection towards D2D communication provided by the invention, tool has the following advantages:
1. this method has considered the feature of D2D communication and the advantage of Antenna Selection Technology, selects an antenna to carry out the transmitting of signal in multiple transmitting antennas, can reduce design complexities, effectively raises the total capacity of system.
2. this method provides the strategy of two kinds of sky line options, and each method realizes the maximization of overall system capacity from different angles, different in the situation that, can select accordingly.
3. this method is simple to operate, can make full use of channel condition information, and the adaptive day line options of carrying out can improve the total capacity of D2D communication system in some cases greatly, has improved the utilization ratio of system resource.Brief description of the drawings
Fig. 1 the present invention is based in the antenna selecting method of D2D communication, to transmit that the period divides and the flow chart of an embodiment of implementation step;
Fig. 2 is the flow chart that the present invention is based on an embodiment of antenna selection strategy module in the antenna selecting method of D2D communication.
Embodiment
Below in conjunction with specific embodiment, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the amendment of the various equivalent form of values of the present invention.
Towards the antenna for base station system of selection of D2D communication, specifically comprise the following steps:
Step 1, in each transmission period end, base station obtains the channel condition information of each transmitting antenna to phone user and D2D user;
Step 2: base station, according to the channel coefficient matrix between the transmitting antenna obtaining in step 1 and reception antenna, is minimised as target with cellular link maximum capacity with to D2D link interference respectively, selects optimum transmitting antenna;
For taking cellular link maximum capacity as the maximized antenna selecting method of realization of goal power system capacity, be below referred to as strategy one; D2D link interference is minimised as to the antenna selecting method of target, be below referred to as strategy two.
Step 3: in next transmission period, according to the strategy one in step 2 or strategy two, select corresponding transmitting antenna to carry out signal transmitting, feed back its channel condition information at each transmission time;
Step 4: in this transmission period end, return to step 1, and implement subsequent step in turn, according to the variation of each subscriber channel state, base station selected transmitting antenna is dynamically switched, and carry out next transmit stage, until whole transmitting procedure finishes.
Above-mentioned method, wherein, in described step 1, in each transmission period end, base station obtains the channel condition information of each transmitting antenna to phone user and D2D user.Channel condition information wherein comprises the channel matrix being made up of to the channel coefficients phone user's reception antenna base station transmit antennas, and by base station to the channel matrix D2D user.
Above-mentioned method, wherein, in described step 2, base station is according to the channel coefficient matrix between the transmitting antenna obtaining in step 1 and reception antenna, be minimised as target with cellular link maximum capacity with to D2D link interference respectively, select optimum transmitting antenna; Two kinds of antenna selection strategies are described below:
Strategy one: taking cellular link maximum capacity as target, in a base station M transmitting antenna, choose phone user's the antenna of channel gain maximum as transmitting antenna;
Strategy two: be target taking base station to D2D user's minimum interference, in a base station M transmitting antenna, choose D2D user's the antenna of channel gain minimum as transmitting antenna.
Above-mentioned method, wherein, in described step 3, in next transmission period, according to the strategy one in step 2 or strategy two, selects corresponding transmitting antenna to carry out signal transmitting, feeds back its channel condition information at each transmission time.Specifically, if adopt strategy one, taking cellular link maximum capacity as target, in M antenna, select to have the antenna of maximum channel gain; If adopt strategy two, be target taking base station to D2D user's minimum interference, in M antenna, select D2D user to disturb minimum antenna.
Above-mentioned method, wherein, in described step 4, in this transmission period end, according to the variation of each subscriber channel state, base station selected transmitting antenna is dynamically switched, and carry out signal transmitting according to new antenna selection result by corresponding transmitting antenna in next transmit stage; The duration in each transmission time is according to cellular system environment flexible configuration of living in.
The antenna for base station system of selection towards D2D communication that the embodiment of the present invention provides, the channel condition information that can obtain according to base station, according to different antenna for base station selection strategies, effectively select corresponding optimum transmitting antenna to carry out the transmitting of signal, thereby improved significantly the total capacity of system.
Fig. 1 is the present invention, and towards transmitting in the antenna for base station system of selection of D2D communication, the period divides and the flow chart of an embodiment of implementation step.The method comprises the following steps:
Step 101: in the transmission period 1, signal transmitting is carried out according to current antenna selection result in base station;
Step 102: in the time that the transmission period 1 finishes, carry out emitting antenna selecting.Base station obtains the channel condition information of each transmitting antenna to phone user and D2D user; Corresponding optimum transmitting antenna is selected according to two kinds of different antenna selection strategies in base station;
Step 103: after step 102 finishes, enter next transmission period 2, base station selects optimum transmitting antenna to carry out signal transmitting according to antenna selection result.
Fig. 2 is the flow chart that the present invention is based on an embodiment of antenna selection strategy module in the antenna selecting method of D2D communication.Specifically comprise the steps:
Step 201: base station obtains the channel condition information of each transmitting antenna to phone user and D2D user; If adopt strategy 1, perform step 202; Adopt strategy 2, perform step 203;
Step 202: the channel matrix [h from base station to phone user
b1C, h
b2C..., h
bMC] the middle corresponding transmitting antenna of maximum norm of selecting, as optimum transmitting antenna, execution step 204;
Step 203: from base station to D2D user's channel matrix [h
b1D, h
b2D,, h
bMD] the middle corresponding transmitting antenna of minimum modulus of selecting, as optimum transmitting antenna, execution step 204;
Step 204: use optimal antenna to carry out signal transmitting.
Claims (5)
1. towards an antenna for base station system of selection for D2D communication, it is characterized in that, the method specifically comprises the following steps:
Step 1: in each transmission period end, base station obtains the channel condition information of each transmitting antenna to phone user and D2D user;
Step 2: base station, according to the channel condition information obtaining in step 1, is minimised as target with cellular link maximum capacity with to D2D link interference respectively, selects optimum transmitting antenna;
For taking cellular link maximum capacity as the maximized antenna selecting method of realization of goal power system capacity, be below referred to as strategy one; D2D link interference is minimised as to the antenna selecting method of target, be below referred to as strategy two;
Step 3: in next transmission period, according to the strategy one in step 2 or strategy two, select corresponding transmitting antenna to carry out signal transmitting, feed back its channel condition information at each transmission time;
Step 4: in this transmission period end, return to step 1, and implement subsequent step in turn, according to the variation of each subscriber channel state, base station selected transmitting antenna is dynamically switched, and carry out next transmit stage, until whole transmitting procedure finishes.
2. the antenna for base station system of selection towards D2D communication according to claim 1, is characterized in that: in step 1, in each transmission period end, base station obtains the channel condition information of each transmitting antenna to phone user and D2D user;
Channel condition information comprises the channel matrix being made up of to the channel coefficients phone user's reception antenna base station transmit antennas, and by base station to the channel matrix D2D user.
3. the antenna for base station system of selection towards D2D communication according to claim 1, it is characterized in that: in step 2, base station is according to the channel coefficient matrix between the transmitting antenna obtaining in step 1 and reception antenna, be minimised as target with cellular link maximum capacity with to D2D link interference respectively, select optimum transmitting antenna; Two kinds of antenna selection strategies are described below:
Strategy one: taking cellular link maximum capacity as target, in a base station M transmitting antenna, choose phone user's the antenna of channel gain maximum as transmitting antenna;
Strategy two: be target taking base station to D2D user's minimum interference, in a base station M transmitting antenna, choose D2D user's the antenna of channel gain minimum as transmitting antenna.
4. the antenna for base station system of selection towards D2D communication according to claim 1, it is characterized in that: in step 3, in next transmission period, according to the strategy one in step 2 or strategy two, select corresponding transmitting antenna to carry out signal transmitting, feed back its channel condition information at each transmission time.
5. the antenna for base station system of selection towards D2D communication according to claim 1, it is characterized in that: in step 4, in this transmission period end, according to the variation of each subscriber channel state, base station selected transmitting antenna is dynamically switched, and carry out signal transmitting according to new antenna selection result by corresponding transmitting antenna in next transmit stage; The duration in each transmission time is according to cellular system environment configurations of living in.
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| 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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