WO2017024967A1 - 一种d2d通信资源复用选择的方法及基站、终端 - Google Patents

一种d2d通信资源复用选择的方法及基站、终端 Download PDF

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Publication number
WO2017024967A1
WO2017024967A1 PCT/CN2016/092856 CN2016092856W WO2017024967A1 WO 2017024967 A1 WO2017024967 A1 WO 2017024967A1 CN 2016092856 W CN2016092856 W CN 2016092856W WO 2017024967 A1 WO2017024967 A1 WO 2017024967A1
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Prior art keywords
user
base station
cellular
transmit power
pair
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PCT/CN2016/092856
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English (en)
French (fr)
Inventor
张锐
王文焕
杜思琪
刘潇蔓
李勇朝
朱思真
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中兴通讯股份有限公司
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Publication of WO2017024967A1 publication Critical patent/WO2017024967A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to, but is not limited to, the field of communications, and in particular, to a method for multiplexing and selecting D2D communication resources, a base station, and a terminal.
  • a device-to-device (D2D) device in a cellular network means that a communication link is established between the terminal devices for direct communication without affecting the operation of the entire cellular network.
  • New wireless transmission technology By introducing D2D technology, the burden on the base station can be alleviated, the transmission delay can be reduced, the spectrum utilization rate can be improved, the spectrum resource shortage of the wireless communication system can be solved to a certain extent, and the performance of the cellular network can be further improved.
  • the co-channel mode means that the D2D device and the cellular device communicate using the same time-frequency resource, and the co-channel mode is divided into two modes: a multiplexed cellular uplink channel and a multiplexed cellular downlink channel.
  • the orthogonal channel mode means that the D2D device and the cellular device use different time-frequency resources for communication, and the D2D user does not cause interference to the cellular user.
  • the cellular mode refers to communication between the D2D devices through a BS (Base Station) or an Access Point (AP). The communication process is similar to the cellular communication process.
  • D2D communication uplink and downlink each occupy half of the frequency band of the cell.
  • the interference of the cellular user to the D2D user and the interference of the D2D user to the base station are relatively small, and the channel capacity obtained by the co-channel mode is larger than the channel capacity obtained by the orthogonal channel mode.
  • the interference management strategy is mainly to ensure the communication quality and demand of the cellular user, and the focus is on ensuring the connectivity of the D2D link and the cellular link.
  • the cellular wireless environment can only passively accept the tolerable interference value, and the D2D user transmission power and multiplexing resources cannot be adjusted according to the D2D user requirements.
  • the link quality of D2D communication is limited, and the advantages of D2D short-range communication cannot be fully utilized.
  • the interference value that the cellular communication link can tolerate is reduced, With the limitation of the interference threshold, the number of users capable of direct communication by multiplexing cellular network resources is reduced, and the probability of establishing a D2D link is lowered.
  • the receiver in cellular communication can only passively tolerate the interference caused by the D2D user to itself, resulting in a decrease in the communication quality of the cellular link.
  • the amount of power increase is constant, and real-time power compensation is not performed for the actual interference state of the user, which is bound to cause unnecessary waste of transmission power.
  • the embodiments of the present invention provide a method for multiplexing and selecting D2D communication resources, a base station, and a terminal, to significantly improve the access probability of the D2D user and the power efficiency of the cellular network and the D2D communication under the premise of ensuring the quality of the cellular network.
  • an embodiment of the present invention provides a method for multiplexing selection of D2D communication resources, including:
  • the base station sequentially determines whether the interference caused by the D2D user to completely multiplex the spectrum resources of one cellular user causes a decrease in the CQI level of the cellular user. If not, the D2D user multiplexes the spectrum resources of the selected cellular user. If the value is decreased, the transmit power of the D2D user and the cellular user is calculated according to the corresponding signal to interference and noise ratio threshold, and the spectrum resource of the cellular user with the smallest sum of the transmit power of the D2D user and the cellular user is selected as the D2D user. For reuse.
  • the foregoing method further has the following feature: the calculating the transmit power of the D2D user and the cellular user according to the corresponding signal to interference and noise ratio threshold, respectively, including:
  • the signal to interference and noise ratio threshold of the receiving UE in the D2D user pair the base station side signal to interference and noise ratio threshold, the channel gain of the cellular user to the base station, and the channel gain of the transmitting user to the base station in the D2D user pair.
  • the channel gain of the receiving user of the cellular user to the D2D user pair and the channel gain of the transmitting user to the receiving user in the D2D user pair respectively calculate the transmitting power of the D2D user and the cellular user.
  • the foregoing method further has the following feature: respectively calculating, according to the corresponding signal to interference and noise ratio threshold, the transmit power of the D2D user. And cellular user's transmit power It is obtained by the following formula:
  • H bci is the channel gain of the i-th cellular user to the base station
  • H bdj is the channel gain of the transmitting user to the base station in the j-th D2D user pair
  • H cidj is the i-th cellular user to the j-th D2D user pair
  • the channel gain of the receiving user H dj is the channel gain of the transmitting user to the receiving user in the jth D2D user pair
  • ⁇ ci is the base station end signal to interference and noise ratio threshold
  • ⁇ dj is the jth D2D user pair
  • N 0 is the noise power value within the user bandwidth.
  • the foregoing method further has the following feature: after the calculating the transmit power of the D2D user and the cellular user, the method further includes:
  • the foregoing method further has the following feature: after the D2D user multiplexes the spectrum resources of the cellular user with the smallest selected transmission power increase, the method further includes:
  • the foregoing method further has the following features: the foregoing method further includes:
  • the foregoing method further has the following feature: before the base station sequentially determines whether the interference caused by the D2D user to completely multiplex the spectrum resource of one cellular user causes the CQI level of the cellular user to decrease, the method further includes:
  • the base station receives a communication request sent by the sender in the D2D user pair and a channel state of the D2D link sent by the receiver in the D2D user pair.
  • an embodiment of the present invention further provides a base station, including:
  • the judging module is configured to sequentially determine whether the interference caused by the D2D user to completely multiplex the spectrum resource of one cellular user causes a decrease in the CQI level of the cellular user;
  • a calculation module configured to calculate, according to the corresponding signal to interference and noise ratio threshold, the transmit power of the D2D user and the cellular user, respectively, in the case that the determining module determines the drop;
  • a selection module configured to multiplex the spectrum resources of the selected cellular user for the D2D user when the determining module determines that the drop is not determined; and select the D2D user and the The spectrum resources of the cellular users whose sum of the transmission powers of the cellular users are the smallest are multiplexed for the D2D user pair.
  • the foregoing base station further has the following feature: the calculating module is configured to: according to a noise power value in a user bandwidth, a signal to interference and noise ratio threshold of a receiving user end in a D2D user pair, a base station side signal to interference and noise ratio threshold, and a cellular
  • the channel gain of the user to the base station, the channel gain of the transmitting user to the base station in the D2D user pair, the channel gain of the receiving user of the cellular user to the D2D user pair, and the channel gain of the transmitting user to the receiving user in the D2D user pair are respectively calculated.
  • the transmit power of D2D users and cellular users are respectively calculated.
  • the foregoing base station further has the following features:
  • the calculating module is configured to calculate the transmit power of the D2D user according to the corresponding signal to interference and noise ratio thresholds in the following manners And cellular user's transmit power
  • H bci is the channel gain of the i-th cellular user to the base station
  • H bdj is the channel gain of the sender-to-base station of the j-th D2D user pair
  • H cidj is the i-th cellular user to the j-th D2D user pair
  • the channel gain of the receiving end H dj is the channel gain of the transmitting end to the receiving end of the jth D2D user pair
  • ⁇ ci is the base station end signal to interference and noise ratio threshold
  • ⁇ dj is the receiving end of the jth D2D user pair
  • the signal to interference and noise ratio threshold, N 0 is the noise power value within the user bandwidth.
  • the foregoing base station further has the following features:
  • the determining module is further configured to determine whether the calculated transmit power of the D2D user and the transmit power of the cellular user exceed a maximum allowed transmit power;
  • the selecting module is configured to multiplex the spectrum resources of the cellular users that select the smallest transmission power increase amount for the D2D user if the determining module does not exceed the determination.
  • the base station further includes:
  • the sending module is configured to send the first adjustment information to the D2D user, where the first adjustment information includes the calculated transmit power of the D2D user, and the second adjustment information is sent to the corresponding cellular user, where The second adjustment information includes the calculated transmit power of the cellular user.
  • the base station further includes:
  • the notification module is configured to notify the D2D user to select the multiplexed spectrum resource.
  • the base station further includes:
  • the receiving module is configured to receive a communication request sent by the sending end of the D2D user pair and a channel status of the D2D link sent by the receiving end of the D2D user pair.
  • the embodiment of the present invention further provides a method for multiplexing selection of D2D communication resources, including:
  • the D2D terminal sends a communication request to the base station
  • the D2D terminal After receiving the notification from the base station, the D2D terminal multiplexes the spectrum resource selected by the base station.
  • the foregoing method further has the following features: the foregoing method further includes:
  • the D2D terminal After receiving the adjustment information of the base station, the D2D terminal adjusts the transmit power according to the adjustment information, where the adjustment information includes the calculated transmit power of the D2D user.
  • the embodiment of the present invention further provides a method for multiplexing selection of D2D communication resources, including:
  • the D2D terminal sends the channel state of the D2D link to the base station;
  • the D2D terminal After receiving the notification from the base station, the D2D terminal multiplexes the spectrum resource selected by the base station.
  • the foregoing method further has the following features: the foregoing method further includes:
  • the D2D terminal After receiving the adjustment information of the base station, the D2D terminal adjusts the transmit power according to the adjustment information, where the adjustment information includes the calculated transmit power of the D2D user.
  • the embodiment of the present invention further provides a terminal that supports the D2D technology, where the method includes:
  • the first sending module as a transmitting end of the D2D user pair, is configured to send a communication request to the base station;
  • the multiplexing module is configured to: after receiving the notification of the base station, multiplex the spectrum resource selected by the base station.
  • the foregoing terminal further has the following features: the foregoing terminal further includes:
  • the adjusting module is configured to: after receiving the adjustment information of the base station, adjust the transmit power according to the adjustment information, where the adjustment information includes the calculated transmit power of the D2D user.
  • the foregoing terminal further has the following features: the foregoing terminal further includes:
  • the second sending module as a receiving end of the D2D user pair, is configured to send a channel state of the D2D link to the base station.
  • the embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, the method for implementing the D2D communication resource multiplexing selection of the first aspect when the computer executable instructions are executed.
  • An embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, where the computer executable instructions are implemented to implement the D2D communication resource multiplexing of the third aspect. The method of choice.
  • the embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, the method for implementing the D2D communication resource multiplexing selection of the fourth aspect when the computer executable instructions are executed.
  • the embodiments of the present invention provide a method for multiplexing and selecting D2D communication resources, and a base station and a terminal, which combine the actual modulation coding mode on the spectrum efficiency, and perform selective power compensation on the user according to the CQI level.
  • the minimum is the criterion to select the reuse user.
  • the method significantly improves the access probability of D2D users and the power efficiency of cellular networks and D2D communication under the premise of ensuring the quality of cellular networks, and has practical application value.
  • FIG. 1 is a schematic diagram of a D2D communication unit under a cellular network in the related art
  • FIG. 2 is a schematic diagram of a cellular network model supporting D2D communication in the related art
  • FIG. 3 is a flowchart of a method for multiplexing selection of D2D communication resources according to an embodiment of the present invention
  • FIG. 4 is an optional flowchart of a method for multiplexing selection of D2D communication resources according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of multiplexing cellular uplink resource interference according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a base station according to an embodiment of the present invention.
  • FIG. 7 is a flowchart 1 of another method for multiplexing selection of D2D communication resources according to an embodiment of the present invention.
  • FIG. 8 is a second flowchart of another method for multiplexing selection of D2D communication resources according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a terminal according to an embodiment of the present invention.
  • the system can obtain higher spectral efficiency.
  • the interference generated by multiplexing different cellular resources is different.
  • the D2D user multiplexes the cellular user uplink resources the D2D user interferes with the base station in the system. ; for D2D
  • the user multiplexes the downlink resources of the cellular user the cellular user is interfered by the D2D user in the system. If the co-channel interference generated by multiplexing is not effectively processed, the introduction of D2D communication can not only improve the system performance, but also degrade the quality of the original cellular communication. Therefore, it is important to rationally select resource reuse and reduce the impact of interference.
  • D j is composed of a transmitting terminal T j and a receiving terminal R j .
  • the BS is located at the center of a cell of radius R.
  • C i and T j are evenly distributed in the cell, and R j is uniformly distributed on the circumference having a radius of the center d of T j .
  • D j multiplexes the uplink or downlink resources of the cellular communication under the control of the cellular user, and the two scenarios interfere with each other.
  • the uplink resource is multiplexed, and the interference object is a base station and a D2D receiving user; the downlink resource is multiplexed, and the interference object is a cellular user and a D2D receiving user.
  • the base station Before the D2D user sends an access request to the base station, the base station has allocated a channel of the same bandwidth to the cellular user, and the cellular user is already communicating with the base station.
  • Cellular users adopt a signal-to-noise ratio (SNR) mechanism, and the communication quality requirements of cellular users and D2D users are certain, that is, the received SINR (Signal to Interference plus Noise Ratio) must be .
  • the base station can know the channel gain information between all the network users and the base station.
  • the D2D receiving user can learn the channel gain information of the D2D transmitting user and itself, and feed this information back to the base station through the control channel.
  • a D2D user pair fully multiplexes the spectrum resources of one cellular user, and the spectrum resources used by the cellular users are multiplexed at most once.
  • the communication request information is sent to the base station, and the D2D receiving end transmits information about the D2D link and the interference situation to the base station through the control channel. Based on this information, the base station can determine a resource reuse policy for D2D communication and transmit the value of the multiplexing policy and transmit power to the D2D transmitter.
  • the method for multiplexing selection of D2D communication resources in this embodiment includes the following steps:
  • Step 11 The base station sequentially determines whether the interference caused by the D2D user to completely multiplex the spectrum resource of one cellular user causes a decrease in the CQI (Channel Quality Indication) level of the cellular user. If not, go to step 12; If it falls, go to step 13;
  • CQI Channel Quality Indication
  • Step 12 multiplex the spectrum resources of the selected cellular user for the D2D user;
  • Step 13 Calculate the transmit power of the D2D user and the cellular user according to the corresponding signal to interference and noise ratio threshold, respectively, for the D2D user to select the spectrum resource of the cellular user with the smallest sum of the transmit power of the D2D user and the cellular user. Reuse.
  • the base station in this embodiment determines whether to adjust the transmit power of the cellular user by determining whether the interference caused by the D2D is caused to cause a decrease in the CQI level of the cellular user; and selecting the multiplexing resource for the D2D user pair and determining the transmit power of the D2D user according to the D2D requirement.
  • the transmission power of all terminals is less than the maximum transmission power P M allowed by the system.
  • the method for multiplexing selection of D2D communication resources includes the following steps:
  • Step 100 Calculate a transmit power of a CUE (Cellular User Equipment) according to an SNR threshold.
  • CUE Cellular User Equipment
  • Step 101 The DUE (Device-to-Device User Equipment) requests access.
  • Step 102 Calculate a transmit power of the DUE according to a transmit power of the CUE and a SINR threshold.
  • Step 103 Calculate the SINR of the CUE (including the interference of the DUE at this time), determine whether the decrease in the SINR of the cellular user causes the CQI level of the cellular user to decrease, and if yes, go to step 104; otherwise, go to step 109;
  • Step 104 Calculate the transmit power of the CUE and the DUE according to the respective SINR thresholds.
  • Step 105 Determine whether the calculated transmit power of the CUE and the DUE exceeds the maximum allowed transmit power. If one of the transmit powers of the CUE and the DUE exceeds, go to step 106. If not, go to step 107.
  • Step 106 The DUE access fails.
  • Step 107 multiplex the spectrum resources of the CUE with the smallest sum of the transmit powers of the CUE and the DUE;
  • Step 108 The DUE is successfully accessed.
  • Step 109 Select a spectrum resource of the CUE for multiplexing.
  • H bci , H bdj , H dj , and H cidj are channel gains of C i ⁇ BS, T j ⁇ BS, T j ⁇ R j , and C i ⁇ R j , respectively.
  • the base station Before the D2D user sends an access request to the base station, the base station has allocated a channel of the same bandwidth to the cellular user, and the cellular user is already communicating with the base station.
  • Cellular users adopt a constant arrival SNR power control mechanism, and the communication quality requirements of cellular users and D2D users are certain, that is, the receiving SINR is constant.
  • the base station can know the channel gain information between all the network users and the base station.
  • the D2D receiving user can learn the channel gain information of the D2D transmitting user and itself, and feed this information back to the base station through the control channel.
  • a D2D user pair fully multiplexes the spectrum resources of one cellular user, and the spectrum resources used by the cellular users are multiplexed at most once.
  • the communication request information is sent to the base station, and the D2D receiving end transmits information about the D2D link and the interference situation to the base station through the control channel.
  • C i Before the D2D user accesses the system, C i communicates with the BS, and the base station SNR threshold ⁇ ci is defined as follows:
  • P ci is the transmit power of the cellular user C i and N 0 is the noise power value within the user bandwidth.
  • the D2D transmitter After accessing the D2D user, the D2D transmitter will cause interference to the base station, and the cellular user will interfere with the D2D receiver.
  • the base station side signal to interference and noise ratio and the D2D user receiver signal dry noise are as follows:
  • P ci is the transmit power of the cellular subscriber C i and P dj is the transmit power of the D2D transmit subscriber T j .
  • the base station side signal to interference and noise ratio and the D2D user receiving end signal dry noise are as follows:
  • the transmit power of the cellular user after the introduction of D2D can be obtained.
  • the cellular user's transmit power increment ⁇ P ci can be written Let the maximum transmit power be P M , and the transmit power can be changed to ensure that the SINR of the D2D user and the cellular user are unchanged.
  • the spectral efficiency ⁇ is defined as a performance criterion in the D2D system:
  • S( ⁇ ) is a modulation symbol of T j and C i
  • F[CQI( ⁇ )] is the number of information bits per symbol.
  • the definition W is the system bandwidth.
  • the spectrum efficiency is determined by the CQI, that is, the quantization of the measured SINR. Therefore, in order to maintain the system spectral efficiency, the change in transmit power only needs to occur when the CQI level is degraded rather than when the SINR value is decreased. Considering power efficiency, CQI-based power allocation strategies are superior to SINR-based strategies.
  • the base station has allocated resources for the cellular users, and the D2D users are connected to the system, and the total system power consumption is defined as P.
  • the power efficiency of the system can be expressed as:
  • the base station side selects the multiplexed user according to the total power increase amount. Assume that there are N pairs of D2D users and M cellular users in the cell. Each cellular user is multiplexed by up to a pair of D2D users. Selecting N user resources from the M CUEs allows the D2D users to multiplex, and under the respective target SINR restriction conditions, the terminal maximum transmit power limit is met, and the respective transmit powers are obtained.
  • MINLP Mixed-Integer Nonlinear Programming
  • the transmission power of the cellular user and the D2D user is obtained. If the obtained transmit power exceeds the maximum allowable transmit power of the terminal, the D2D user is prohibited from multiplexing the cellular user resource; if the maximum transmit power limit is met, the adjusted transmit power is notified to the D2D user and the cellular user through the downlink control channel, and Notify the D2D user to communicate the resources reused.
  • the D2D user After receiving the notification, the D2D user multiplexes the spectrum resources selected by the base station and adjusts the transmission power.
  • FIG. 6 is a schematic diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the base station in this embodiment includes:
  • the judging module is configured to sequentially determine whether the interference caused by the D2D user to completely multiplex the spectrum resource of one cellular user causes a decrease in the CQI level of the cellular user;
  • the calculation module is configured to calculate, according to the corresponding signal to interference and noise ratio threshold, the transmit power of the D2D user and the cellular user, respectively, in the case that the determining module determines the drop, and calculate the transmit of the cellular user.
  • Selecting a module configured to multiplex the spectrum resources of the selected cellular user for the D2D user when the determining module determines that the drop is not determined; after the calculating module calculates the increase amount of the transmit power of the cellular user, The D2D user multiplexes the spectrum resources of the cellular users that select the smallest increase in transmit power.
  • the calculating module is configured to: according to a noise power value in a user bandwidth, a signal to interference and noise ratio threshold of a receiving user end in a D2D user pair, a base station side signal to interference and noise ratio threshold, and a cellular user to the base station.
  • a noise power value in a user bandwidth a signal to interference and noise ratio threshold of a receiving user end in a D2D user pair
  • a base station side signal to interference and noise ratio threshold and a cellular user to the base station.
  • Channel gain, channel gain of the transmitting user to the base station in the D2D user pair, channel gain of the receiving user of the cellular user to the D2D user pair, and channel gain of the transmitting user to the receiving user in the D2D user pair respectively calculating the D2D user and The transmit power of the cellular subscriber.
  • the calculating module is configured to calculate the transmit power of the D2D user according to the corresponding signal to interference and noise ratio thresholds by using the following formulas. And cellular user's transmit power
  • H bci is the channel gain of the i-th cellular user to the base station
  • H bdj is the channel gain of the transmitting user to the base station in the j-th D2D user pair
  • H cidj is the i-th cellular user to the j-th D2D user pair
  • the channel gain of the receiving user H dj is the channel gain of the transmitting user to the receiving user in the jth D2D user pair
  • ⁇ ci is the base station end signal to interference and noise ratio threshold
  • ⁇ dj is the jth D2D user pair
  • N 0 is the noise power value within the user bandwidth.
  • the determining module is further configured to determine whether the calculated transmit power of the D2D user and the transmit power of the cellular user exceed a maximum allowed transmit power;
  • the selecting module is configured to multiplex the spectrum resources of the cellular users that select the smallest transmission power increase amount for the D2D user if the determining module does not exceed the determination.
  • the base station may further include:
  • a sending module configured to send first adjustment information to the D2D user, where the first adjustment information includes the calculated transmit power of the D2D user; and send the first to the corresponding cellular user And second adjustment information, wherein the second adjustment information includes the calculated transmit power of the cellular user.
  • the base station may further include:
  • the notification module is configured to notify the D2D user to select the multiplexed spectrum resource.
  • the base station may further include:
  • the receiving module is configured to receive a communication request sent by the sending end of the D2D user pair and a channel status of the D2D link sent by the receiving end of the D2D user pair.
  • the embodiment of the present invention further provides a method for multiplexing selection of D2D communication resources, including:
  • Step 21 The D2D terminal sends a communication request to the base station.
  • Step 22 After receiving the notification of the base station, the D2D terminal multiplexes the spectrum resource selected by the base station.
  • the method further includes:
  • the D2D terminal After receiving the adjustment information of the base station, the D2D terminal adjusts the transmit power according to the adjustment information, where the adjustment information includes the calculated transmit power of the D2D user.
  • the embodiment of the present invention further provides a method for multiplexing selection of D2D communication resources, including:
  • Step 31 The D2D terminal sends the channel state of the D2D link to the base station.
  • Step 32 After receiving the notification of the base station, the D2D terminal multiplexes the spectrum resource selected by the base station.
  • the method further includes:
  • the D2D terminal After receiving the adjustment information of the base station, the D2D terminal adjusts the transmit power according to the adjustment information, where the adjustment information includes the calculated transmit power of the D2D user.
  • FIG. 9 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 9, the terminal in this embodiment supports D2D technology, and includes:
  • the first sending module as a transmitting end of the D2D user pair, is configured to send a communication request to the base station;
  • the multiplexing module is configured to: after receiving the notification of the base station, multiplex the spectrum resource selected by the base station.
  • the terminal may further include:
  • the adjusting module is configured to: after receiving the adjustment information of the base station, adjust the transmit power according to the adjustment information, where the adjustment information includes the calculated transmit power of the D2D user.
  • the terminal may further include:
  • the second sending module as a receiving end of the D2D user pair, is configured to send a channel state of the D2D link to the base station.
  • the embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, which are implemented to implement a method for multiplexing selection of the D2D communication resources applied to a base station.
  • the embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when the computer executable instructions are executed to implement the D2D communication resource multiplexing selection method applied to the D2D terminal.
  • the embodiments of the present application provide a method, a base station, and a terminal for D2D communication resource multiplexing selection, and combine the actual modulation coding mode on the spectrum efficiency, and perform selective power compensation on the user according to the CQI level, with the minimum power increase criterion. Selecting the multiplexing user; under the premise of ensuring the quality of the cellular network, the access probability of the D2D user and the power efficiency of the cellular network and the D2D communication are significantly improved, and the engineering practical application value is obtained.

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Abstract

一种D2D通信资源复用选择的方法，包括：基站依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户CQI等级的下降，如未下降，则为所述D2D用户对选择对应的蜂窝用户的频谱资源进行复用；如下降，则分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率，选择D2D用户和蜂窝用户的发射功率增加量之和最小的对应的蜂窝用户的频谱资源为所述D2D用户对复用。上述方法可以在保证蜂窝网络质量的前提下，显著地提高D2D用户的接入概率以及蜂窝网络和D2D通信的功率效率。

Description

一种D2D通信资源复用选择的方法及基站、终端 技术领域
本申请涉及但不限于通信领域，尤其涉及一种D2D通信资源复用选择的方法及基站、终端。
背景技术
蜂窝网络下的终端直通技术设备到设备(Device-to-Device，简称D2D)是指在不影响整体蜂窝网络运行的情况下，终端设备之间建立通信链路进行直接通信，不通过基站中转的新型无线传输技术。通过引入D2D技术，能够减轻基站负担，减小传输时延，提高频谱利用率，在一定程度上解决无线通信系统频谱资源匮乏的问题，进一步提升蜂窝网络性能。
支持D2D功能的蜂窝网络中，用户可使用共信道模式、正交信道模式和蜂窝模式三种不同的模式进行通信，如图1所示。共信道模式指D2D设备和蜂窝设备使用相同时频资源进行通信，共信道模式分为复用蜂窝上行信道和复用蜂窝下行信道两种方式。正交信道模式指D2D设备和蜂窝设备使用不同的时频资源进行通信，此时D2D用户不会对蜂窝用户造成干扰。蜂窝模式指D2D设备之间通过BS(Base Station，基站)或AP(Access Point，接入点)进行通信，通信过程和蜂窝通信过程类似，在FDD(Frequency Division Duplex，频分双工)模式下D2D通信上下行各占蜂窝一半频带。当D2D用户对之间的距离很小时，此时蜂窝用户对D2D用户的干扰以及D2D用户对基站的干扰都比较小，共信道模式获得的信道容量比正交信道模式获得的信道容量大。
由于D2D链路复用蜂窝链路资源，故会产生同频干扰。若未对此干扰进行有效处理，引入D2D通信不仅无法提升系统性能，反而使原有蜂窝通信的质量下降。因此，合理地进行资源复用选择，减少干扰的影响至关重要。
在相关技术方案中，干扰管理策略以优先保障蜂窝用户的通信质量与需求为主，其重点在于保证D2D链路及蜂窝链路的连通性。相关的干扰容忍类方案中，对于D2D用户而言，只能被动接受蜂窝无线环境可容忍干扰值，不能根据D2D用户需求调整D2D用户发射功率及复用资源。一方面，从根源 上限制了D2D通信的链路质量，不能充分发挥D2D短距离通信的优势；另一方面，当网络用户数目较多，网络干扰环境复杂时，蜂窝通信链路可容忍的干扰值降低，那么由于干扰门限的限制，能够通过复用蜂窝网络资源进行直接通信的用户数目减少，D2D链路建立概率降低。对于蜂窝用户而言，蜂窝通信中的接收者只能被动容忍D2D用户对其自身造成的干扰，致使蜂窝链路通信质量的下降。相关的功率补偿方案中，功率增加量一定，没有针对用户实际干扰状态进行实时功率补偿，势必会造成不必要的发射功率的浪费。而且，虽然进行了功率补偿，仍然不可避免出现了干扰容忍类方案类似的问题，即无法满足D2D用户的通信需求。在实际应用中，若仅简单应用上述干扰管理方案，当D2D链路对蜂窝链路的干扰超过一定门限时，系统会拒绝D2D链路接入，造成D2D用户允许接入概率的下降。如何支持尽可能多的用户以D2D方式接入网络，是干扰管理面临的一大挑战。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供一种D2D通信资源复用选择的方法及基站、终端，以在保证蜂窝网络质量的前提下，显著地提高D2D用户的接入概率以及蜂窝网络和D2D通信的功率效率。
第一方面，本发明实施例提供了一种D2D通信资源复用选择的方法，包括：
基站依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户CQI等级的下降，如未下降，则为所述D2D用户对选择对应的蜂窝用户的频谱资源进行复用；如下降，则分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率，选择D2D用户和蜂窝用户的发射功率增加量之和最小的蜂窝用户的频谱资源为所述D2D用户对复用。
可选地，上述方法还具有下面特点：所述分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率，包括：
根据用户带宽内噪声功率值、D2D用户对中的接收用户端的信干噪比门限、基站端信干噪比门限、蜂窝用户到基站的信道增益、D2D用户对中的发送用户到基站的信道增益、蜂窝用户到D2D用户对中的接收用户的信道增益以及D2D用户对中的发送用户到接收用户的信道增益，分别计算D2D用户和蜂窝用户的发射功率。
可选地，上述方法还具有下面特点：分别依次根据对应的信干噪比门限计算D2D用户的发射功率
Figure PCTCN2016092856-appb-000001
和蜂窝用户的发射功率
Figure PCTCN2016092856-appb-000002
是通过以下公式得到的：
Figure PCTCN2016092856-appb-000003
其中，Hbci是第i个蜂窝用户到基站的信道增益，Hbdj是第j个D2D用户对中的发送用户到基站的信道增益，Hcidj是第i个蜂窝用户到第j个D2D用户对中的接收用户的信道增益，Hdj是第j个D2D用户对中的发送用户到接收用户的信道增益，λci是基站端信干噪比门限，λdj是第j个D2D用户对中的接收用户端的信干噪比门限，N0是用户带宽内噪声功率值。
可选地，上述方法还具有下面特点：所述计算D2D用户和蜂窝用户的发射功率之后，上述方法还包括：
判断计算出的D2D用户的发射功率和蜂窝用户的发射功率是否超过最大允许发射功率；若从均未超过，则为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用。
可选地，上述方法还具有下面特点：所述为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用之后，上述方法还包括：
向所述D2D用户发送第一调整信息，所述第一调整信息包括所述计算出的D2D用户的发射功率；
向对应的蜂窝用户发送第二调整信息，所述第二调整信息包括所述计算出的蜂窝用户的发射功率。
可选地，上述方法还具有下面特点：上述方法还包括：
通知所述D2D用户选择复用的频谱资源。
可选地，上述方法还具有下面特点：所述基站依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户CQI等级的下降之前，上述方法还包括：
所述基站接收所述D2D用户对中的发送端发送的通信请求及所述D2D用户对中的接收端发送的D2D链路的信道状态。
第二方面，本发明实施例还提供了一种基站，其中，包括：
判断模块，设置为依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户CQI等级的下降；
计算模块，设置为在所述判断模块判断下降的情况下，分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率；
选择模块，设置为在所述判断模块判断未下降的情况下，为所述D2D用户对选择对应的蜂窝用户的频谱资源进行复用；在所述判断模块判断下降的情况下，选择D2D用户和蜂窝用户的发射功率增加量之和最小的蜂窝用户的频谱资源为所述D2D用户对复用。
可选地，上述基站还具有下面特点：所述计算模块，设置为：根据用户带宽内噪声功率值、D2D用户对中的接收用户端的信干噪比门限、基站端信干噪比门限、蜂窝用户到基站的信道增益、D2D用户对中的发送用户到基站的信道增益、蜂窝用户到D2D用户对中的接收用户的信道增益以及D2D用户对中的发送用户到接收用户的信道增益，分别计算D2D用户和蜂窝用户的发射功率。
可选地，上述基站还具有下面特点：
所述计算模块，设置为通过以下方式分别依次根据对应的信干噪比门限计算D2D用户的发射功率
Figure PCTCN2016092856-appb-000004
和蜂窝用户的发射功率
Figure PCTCN2016092856-appb-000005
Figure PCTCN2016092856-appb-000006
其中，Hbci是第i个蜂窝用户到基站的信道增益，Hbdj是第j个D2D用户对中的发送端到基站的信道增益，Hcidj是第i个蜂窝用户到第j个D2D用户对中的接收端的信道增益，Hdj是第j个D2D用户对中的发送端到接收端的信道增益，λci是基站端信干噪比门限，λdj是第j个D2D用户对中的接收端的信干噪比门限，N0是用户带宽内噪声功率值。
可选地，上述基站还具有下面特点：
所述判断模块，还设置为判断计算出的D2D用户的发射功率和蜂窝用户的发射功率是否超过最大允许发射功率；
所述选择模块，设置为在所述判断模块判断均未超过的情况下，为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用。
可选地，上述基站还具有下面特点：所述基站还包括：
发送模块，设置为向所述D2D用户发送第一调整信息，其中，所述第一调整信息包括所述计算出的D2D用户的发射功率；向对应的蜂窝用户发送第二调整信息，其中，所述第二调整信息包括所述计算出的蜂窝用户的发射功率。
可选地，上述基站还具有下面特点：所述基站还包括：
通知模块，设置为通知所述D2D用户选择复用的频谱资源。
可选地，上述基站还具有下面特点：所述基站还包括：
接收模块，设置为接收所述D2D用户对中的发送端发送的通信请求及所述D2D用户对中的接收端发送的D2D链路的信道状态。
第三方面，本发明实施例还提供了一种D2D通信资源复用选择的方法，包括：
D2D终端向基站发送通信请求；
所述D2D终端接收到所述基站的通知后，复用所述基站选择的频谱资源。
可选地，上述方法还具有下面特点:上述方法还包括：
所述D2D终端接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
第四方面，本发明实施例还提供了一种D2D通信资源复用选择的方法，包括：
D2D终端向基站发送D2D链路的信道状态；
所述D2D终端接收到所述基站的通知后，复用所述基站选择的频谱资源。
可选地，上述方法还具有下面特点：上述方法还包括：
所述D2D终端接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
第五方面，本发明实施例还提供了一种终端，支持D2D技术，其中，包括：
第一发送模块，作为D2D用户对的发送端，设置为向基站发送通信请求；
复用模块，设置为接收到所述基站的通知后，复用所述基站选择的频谱资源。
可选地，上述终端还具有下面特点：上述终端还包括：
调整模块，设置为接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
可选地，上述终端还具有下面特点：上述终端还包括：
第二发送模块，作为D2D用户对的接收端，设置为向所述基站发送D2D链路的信道状态。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现第一方面的上述D2D通信资源复用选择的方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现第三方面的上述D2D通信资源复用 选择的方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现第四方面的上述D2D通信资源复用选择的方法。
综上，本发明实施例提供一种D2D通信资源复用选择的方法及基站、终端，结合实际中调制编码方式对频谱效率的影响，根据CQI等级对用户进行选择性功率补偿，以功率增加量最小为准则选择复用用户。该方法在保证蜂窝网络质量的前提下，显著地提高了D2D用户的接入概率以及蜂窝网络和D2D通信的功率效率，具有工程实际应用价值。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为相关技术中的蜂窝网络下D2D通信单元的示意图；
图2为相关技术中支持D2D通信的蜂窝网络模型的示意图；
图3为本发明实施例的D2D通信资源复用选择的方法的流程图；
图4为本发明实施例的D2D通信资源复用选择的方法的可选流程图；
图5为本发明实施例的复用蜂窝上行资源干扰的示意图；
图6为本发明实施例的基站的示意图；
图7为本发明实施例的另一种D2D通信资源复用选择的方法的流程图一；
图8为本发明实施例的另一种D2D通信资源复用选择的方法的流程图二；
图9为本发明实施例的终端的示意图。
本发明的实施方式
在蜂窝网络下短距离D2D通信场景下，当D2D用户与蜂窝用户复用相同资源时，系统可获得更高的频谱效率。在D2D用户与蜂窝用户复用相同资源进行通信的场景中，复用不同的蜂窝资源产生的干扰不相同，当D2D用户复用蜂窝用户上行链路资源时，系统中受D2D用户干扰的是基站；D2D用 户复用蜂窝用户下行链路资源时，系统中受D2D用户干扰的是蜂窝用户。若未对复用产生的同频干扰进行有效处理，引入D2D通信不仅无法提升系统性能，反而使原有蜂窝通信的质量下降。因此，合理地进行资源复用选择，减少干扰影响至关重要。
下文中将结合附图对本发明实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
本实施例中，小区中有M个蜂窝用户(Ci,i＝1,2,…,M)和N个D2D用户对(Dj,j＝1,2,3,…N)的单小区场景，如图2所示。Dj由发射端Tj和接收端Rj组成。BS位于半径为R的小区的中心。Ci和Tj均匀地分布在小区内，而Rj均匀地分布在以Tj为圆心d为半径的圆周上。Dj在蜂窝用户的控制下复用蜂窝通信的上行或下行链路资源，两种情景干扰对象不同。复用上行资源，干扰对象为基站与D2D接收用户；复用下行资源，干扰对象为蜂窝用户与D2D接收用户。
D2D用户向基站发送接入请求前，基站已为蜂窝用户分配相同带宽的信道，且蜂窝用户已在与基站进行通信。蜂窝用户采用恒定到达SNR(Signal to Noise Ratio，信噪比)功控机制，蜂窝用户以及D2D用户的通信质量要求一定，即接收SINR(Signal to Interference plus Noise Ratio，信号与干扰加噪声比)一定。而且，基站可获知所有在网用户与基站间信道增益信息。D2D接收用户可获知D2D发射用户与自身的信道增益信息，并将这一信息通过控制信道反馈给基站。此外，假设一个D2D用户对完全复用一个蜂窝用户的频谱资源，且蜂窝用户所用的频谱资源最多被复用一次。
当D2D用户需要通信且满足距离的约束时，就向基站发送通信请求信息，同时D2D接收端通过控制信道向基站发送有关D2D链路和干扰情况的信息。根据这些信息，基站可以确定对D2D通信的资源复用策略，并且向D2D发射端发送复用策略和发射功率的值。
如图3所示，本实施例的D2D通信资源复用选择的方法包括以下步骤：
步骤11、基站依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户CQI(Channel Quality Indication，信道质量指示)等级的下降，如未下降，则转步骤12；如下降，则转步骤13；
步骤12、为所述D2D用户对选择对应的蜂窝用户的频谱资源进行复用；
步骤13、分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率，为所述D2D用户对选择D2D用户和蜂窝用户的发射功率增加量之和最小的蜂窝用户的频谱资源进行复用。
本实施例中的基站通过判断引入D2D造成的干扰是否引起蜂窝用户CQI等级的下降，决定是否调整蜂窝用户发射功率；根据D2D需求，为D2D用户对选择复用资源并决定D2D用户发射功率。同时所有终端的发射功率都小于系统所允许的最大发射功率PM。
如图4所示，本实施例提供的D2D通信资源复用选择的方法，包括以下步骤：
步骤100、根据SNR门限计算CUE(Cellular User Equipment，蜂窝用户设备)的发射功率；
步骤101、DUE(Device-to-Device User Equipment，D2D用户设备)请求接入；
步骤102、根据CUE的发射功率和SINR门限计算得到DUE的发射功率；
步骤103、计算CUE的SINR(此时包括DUE的干扰)，判断蜂窝用户的SINR下降是否引起蜂窝用户CQI等级下降，如是，则转步骤104；否则转步骤109；
步骤104、重新根据各自的SINR门限计算CUE和DUE的发射功率；
步骤105、判断计算出的CUE和DUE的发射功率是否超过最大允许发射功率，如CUE和DUE的发射功率中有一个超过，则转步骤106，如未超过，则转步骤107；
步骤106、DUE接入失败。
步骤107、选取CUE和DUE的发射功率增加量之和最小的CUE的频谱资源进行复用；
步骤108、DUE接入成功。
步骤109、选择该CUE的频谱资源进行复用。
本实例以复用蜂窝通信上行资源场景为例进行分析，如图5所示。Hbci，Hbdj，Hdj，和Hcidj分别是Ci→BS，Tj→BS，Tj→Rj以及Ci→Rj的信道增益。
D2D用户向基站发送接入请求前，基站已为蜂窝用户分配相同带宽的信道，且蜂窝用户已在与基站进行通信。蜂窝用户采用恒定到达SNR功控机制，蜂窝用户以及D2D用户的通信质量要求一定，即接收SINR一定。而且，基站可获知所有在网用户与基站间信道增益信息。D2D接收用户可获知D2D发射用户与自身的信道增益信息，并将这一信息通过控制信道反馈给基站。一个D2D用户对完全复用一个蜂窝用户的频谱资源，且蜂窝用户所用的频谱资源最多被复用一次。当D2D用户需要通信且满足距离的约束时，就向基站发送通信请求信息，同时D2D接收端通过控制信道向基站发送有关D2D链路和干扰情况的信息。
在D2D用户接入系统以前，Ci与BS间通信，定义基站端信噪比门限ηci如下：
Figure PCTCN2016092856-appb-000007
其中，Pci是蜂窝用户Ci的发射功率，N0是用户带宽内噪声功率值。
接入D2D用户之后，D2D发射端会对基站产生干扰，蜂窝用户会对D2D接收端产生干扰，基站端信干噪比和D2D用户接收端信干噪比如下所示：
Figure PCTCN2016092856-appb-000008
其中，Pci是蜂窝用户Ci的发射功率，Pdj是D2D发射用户Tj的发射功率。
为补偿D2D干扰所造成的基站端SINR减小，为蜂窝用户Ci增大发射功率，增量为ΔPci，即
Figure PCTCN2016092856-appb-000009
同样地，D2D用户的发射功率变为
Figure PCTCN2016092856-appb-000010
此时，基站端信干噪比和D2D用户接收端信干噪比如下所 示：
Figure PCTCN2016092856-appb-000011
根据等式(2)，可求得引入D2D后，蜂窝用户的发射功率
Figure PCTCN2016092856-appb-000012
和D2D用户的发射功率
Figure PCTCN2016092856-appb-000013
Figure PCTCN2016092856-appb-000014
其中，蜂窝用户的发射功率增量ΔPci可写作
Figure PCTCN2016092856-appb-000015
设最大发射功率为PM，可以通过改变发射功率来确保D2D用户和蜂窝用户各自的SINR不变。
在D2D系统中定义频谱效率φ作为性能标准：
Figure PCTCN2016092856-appb-000016
其中，
Figure PCTCN2016092856-appb-000017
S(·)是Tj和Ci的调制符号，F[CQI(·)]是每符号的信息比特数。
此外，定义W为系统带宽，当系统带宽一定时，频谱效率由CQI，即对测量的SINR的量化所决定。因此，为保持系统频谱效率一定，发射功率的改变仅需发生在当CQI等级下降的情况下而不是SINR值下降时。考虑到功率效率，基于CQI的功率分配策略优于基于SINR的策略。
基站已为蜂窝用户分配好资源，将D2D用户接入系统，定义系统总功耗为P，则有：
Figure PCTCN2016092856-appb-000018
其中，
Figure PCTCN2016092856-appb-000019
是网络总的功率增量，包括蜂窝用户的功率增量和D2D用户的发射功率。那么，引入D2D用户后，系统的功率效率可以表示为：
Figure PCTCN2016092856-appb-000020
因为
Figure PCTCN2016092856-appb-000021
是定值，
Figure PCTCN2016092856-appb-000022
值越大，要求ΔP越小，保证蜂窝网络性能。
可见，D2D用户的发射功率越小，功率效率就越高。
Figure PCTCN2016092856-appb-000023
越大，表示相互干扰越小，可以根据
Figure PCTCN2016092856-appb-000024
来选择复用用户。若假定每个蜂窝用户最多只能被D2D用户复用一次，同时每个蜂窝用户所分配带宽一样，那么对于一定数目在同一个分布场景下，目标SINR已确定的蜂窝用户和D2D用户，
Figure PCTCN2016092856-appb-000025
越大等效于P越小。视ΔP为蜂窝系统引入D2D后增加的功率值，功率效率
Figure PCTCN2016092856-appb-000026
作为保证蜂窝性能的重要指标。因为
Figure PCTCN2016092856-appb-000027
是定值，ΔP越小，所对应的
Figure PCTCN2016092856-appb-000028
值越大，即系统功率效率越大。
基站端根据总功率增加量来选择复用用户。假设小区内有N对D2D用户，M个蜂窝用户。每个蜂窝用户最多被一对D2D用户复用。从M个CUE中选择N个用户资源让D2D用户复用，在各自目标SINR限制条件下，满足终端最大发射功率限制，求出各自发射功率。该问题可建模为混合整数非线性规划问题(MINLP，Mixed-Integer Nonlinear Programming)，其数学模型如下：
决策变量:
Figure PCTCN2016092856-appb-000029
优化目标:
Figure PCTCN2016092856-appb-000030
约束条件:
Figure PCTCN2016092856-appb-000031
基站采用匈牙利算法对这一问题进行求解，其中，rij＝1表示第i个CUE与第j个D2D用户对复用资源；为0则表示禁止复用。同时得到了蜂窝用户与D2D用户的发射功率。若得到的发射功率超过终端最大允许发射功率，则禁止D2D用户复用该蜂窝用户资源；若为满足最大发射功率限制，则通过下行控制信道将调整后的发射功率通知D2D用户和蜂窝用户，并通知D2D用户通信所复用的资源。
D2D用户接收到通知后，复用基站所选择的频谱资源，并且调整发射功率。
图6为本发明实施例的基站的示意图，如图6所示，本实施例的基站包括：
判断模块，设置为依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户CQI等级的下降；
计算模块，设置为在所述判断模块判断下降的情况下，分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率，计算蜂窝用户的发 射功率增加量；
选择模块，设置为在判断模块判断未下降的情况下，为所述D2D用户对选择对应的蜂窝用户的频谱资源进行复用；在所述计算模块计算蜂窝用户的发射功率增加量后，为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用。
在一可选实施例中，所述计算模块，设置为：根据用户带宽内噪声功率值、D2D用户对中的接收用户端的信干噪比门限、基站端信干噪比门限、蜂窝用户到基站的信道增益、D2D用户对中的发送用户到基站的信道增益、蜂窝用户到D2D用户对中的接收用户的信道增益以及D2D用户对中的发送用户到接收用户的信道增益，分别计算D2D用户和蜂窝用户的发射功率。
在一可选实施例中，所述计算模块，设置为通过以下公式分别依次根据对应的信干噪比门限计算D2D用户的发射功率
Figure PCTCN2016092856-appb-000032
和蜂窝用户的发射功率
Figure PCTCN2016092856-appb-000033
Figure PCTCN2016092856-appb-000034
其中，Hbci是第i个蜂窝用户到基站的信道增益，Hbdj是第j个D2D用户对中的发送用户到基站的信道增益，Hcidj是第i个蜂窝用户到第j个D2D用户对中的接收用户的信道增益，Hdj是第j个D2D用户对中的发送用户到接收用户的信道增益，λci是基站端信干噪比门限，λdj是第j个D2D用户对中的接收用户端的信干噪比门限，N0是用户带宽内噪声功率值。
在一可选实施例中，所述判断模块，还设置为判断计算出的D2D用户的发射功率和蜂窝用户的发射功率是否超过最大允许发射功率；
所述选择模块，设置为在所述判断模块判断均未超过的情况下，为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用。
在一可选实施例中，所述基站还可以包括：
发送模块，设置为向所述D2D用户发送第一调整信息，其中，所述第一调整信息包括所述计算出的D2D用户的发射功率；向对应的蜂窝用户发送第 二调整信息，其中，所述第二调整信息包括所述计算出的蜂窝用户的发射功率。
在一可选实施例中，所述基站还可以包括：
通知模块，设置为通知所述D2D用户选择复用的频谱资源。
在一可选实施例中，所述基站还可以包括：
接收模块，设置为接收所述D2D用户对中的发送端发送的通信请求及所述D2D用户对中的接收端发送的D2D链路的信道状态。
如图7所示，本发明实施例还提供一种D2D通信资源复用选择的方法，包括：
步骤21：D2D终端向基站发送通信请求；
步骤22：D2D终端接收到所述基站的通知后，复用所述基站选择的频谱资源。
其中，所述方法还包括：
所述D2D终端接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
如图8所示，本发明实施例还提供一种D2D通信资源复用选择的方法，包括：
步骤31：D2D终端向基站发送D2D链路的信道状态；
步骤32：D2D终端接收到所述基站的通知后，复用所述基站选择的频谱资源。
其中，所述方法还包括：
所述D2D终端接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
其中，基站选择频谱资源的过程同前述方法实施例所述，故于此不再赘述。
图9为本发明实施例的终端的示意图，如图9所示，本实施例的终端，支持D2D技术，包括：
第一发送模块，作为D2D用户对的发送端，设置为向基站发送通信请求；
复用模块，设置为接收到所述基站的通知后，复用所述基站选择的频谱资源。
在一可选实施例中，所述终端还可以包括：
调整模块，设置为接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
在一可选实施例中，所述终端还可以包括：
第二发送模块，作为D2D用户对的接收端，设置为向所述基站发送D2D链路的信道状态。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现应用于基站的上述D2D通信资源复用选择的方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现应用于D2D终端的上述D2D通信资源复用选择的方法。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的模块/单元可以采用硬件的形式实现，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序/指令来实现其相应功能。本发明实施例不限制于任何特定形式的硬件和软件的结合。
以上仅为本申请的可选实施例，本申请还可有其他多种实施例，在不背离本申请精神及其实质的情况下，熟悉本领域的技术人员当可根据本申请作出各种相应的改变和变形，但这些相应的改变和变形都应属于本申请所附的权利要求的保护范围。
工业实用性
本申请实施例提供一种D2D通信资源复用选择的方法、基站及终端，结合实际中调制编码方式对频谱效率的影响，根据CQI等级对用户进行选择性功率补偿，以功率增加量最小为准则选择复用用户；在保证蜂窝网络质量的前提下，显著地提高了D2D用户的接入概率以及蜂窝网络和D2D通信的功率效率，具有工程实际应用价值。

Claims (21)

  1. 一种设备到设备D2D通信资源复用选择的方法，包括：
    基站依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户信道质量指示CQI等级的下降，如未下降，则为所述D2D用户对选择对应的蜂窝用户的频谱资源进行复用；如下降，则分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率，选择D2D用户和蜂窝用户的发射功率增加量之和最小的蜂窝用户的频谱资源为所述D2D用户对复用。
  2. 根据权利要求1所述的方法，其中，所述分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率，包括：
    根据用户带宽内噪声功率值、D2D用户对中的接收用户端的信干噪比门限、基站端信干噪比门限、蜂窝用户到基站的信道增益、D2D用户对中的发送用户到基站的信道增益、蜂窝用户到D2D用户对中的接收用户的信道增益以及D2D用户对中的发送用户到接收用户的信道增益，分别计算D2D用户和蜂窝用户的发射功率。
  3. 如权利要求2所述的方法，其中，分别依次根据对应的信干噪比门限计算D2D用户的发射功率
    Figure PCTCN2016092856-appb-100001
    和蜂窝用户的发射功率
    Figure PCTCN2016092856-appb-100002
    是通过以下公式得到的：
    Figure PCTCN2016092856-appb-100003
    其中，Hbci是第i个蜂窝用户到基站的信道增益，Hbdj是第j个D2D用户对中的发送用户到基站的信道增益，Hcidj是第i个蜂窝用户到第j个D2D用户对中的接收用户的信道增益，Hdj是第j个D2D用户对中的发送用户到接收用户的信道增益，λci是基站端信干噪比门限，λdj是第j个D2D用户对中的接收用户端的信干噪比门限，N0是用户带宽内噪声功率值。
  4. 如权利要求1所述的方法，所述计算D2D用户和蜂窝用户的发射功 率之后，所述方法还包括：
    判断计算出的D2D用户的发射功率和蜂窝用户的发射功率是否超过最大允许发射功率；若均未超过，则为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用。
  5. 如权利要求4所述的方法，所述为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用之后，所述方法还包括：
    向所述D2D用户发送第一调整信息，所述第一调整信息包括所述计算出的D2D用户的发射功率；
    向对应的蜂窝用户发送第二调整信息，所述第二调整信息包括所述计算出的蜂窝用户的发射功率。
  6. 如权利要求1所述的方法，所述方法还包括：
    通知所述D2D用户选择复用的频谱资源。
  7. 如权利要求1至6任一项所述的方法，所述基站依次判断D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户CQI等级的下降之前，所述方法还包括：
    所述基站接收所述D2D用户对中的发送端发送的通信请求及所述D2D用户对中的接收端发送的D2D链路的信道状态。
  8. 一种基站，包括：
    判断模块，设置为依次判断设备到设备D2D用户对完全复用一个蜂窝用户的频谱资源后造成的干扰是否引起蜂窝用户信道质量指示CQI等级的下降；
    计算模块，设置为在所述判断模块判断下降的情况下，分别依次根据对应的信干噪比门限计算D2D用户和蜂窝用户的发射功率；
    选择模块，设置为在所述判断模块判断未下降的情况下，为所述D2D用户对选择对应的蜂窝用户的频谱资源进行复用；在所述判断模块判断下降的情况下，选择D2D用户和蜂窝用户的发射功率增加量之和最小的蜂窝用户的频谱资源进行复用。
  9. 如权利要求8所述的基站，其中，所述计算模块，设置为：根据用户 带宽内噪声功率值、D2D用户对中的接收用户端的信干噪比门限、基站端信干噪比门限、蜂窝用户到基站的信道增益、D2D用户对中的发送用户到基站的信道增益、蜂窝用户到D2D用户对中的接收用户的信道增益以及D2D用户对中的发送用户到接收用户的信道增益，分别计算D2D用户和蜂窝用户的发射功率。
  10. 如权利要求9所述的基站，其中，所述计算模块，设置为通过以下公式分别依次根据对应的信干噪比门限计算D2D用户的发射功率
    Figure PCTCN2016092856-appb-100004
    和蜂窝用户的发射功率
    Figure PCTCN2016092856-appb-100005
    Figure PCTCN2016092856-appb-100006
    其中，Hbci是第i个蜂窝用户到基站的信道增益，Hbdj是第j个D2D用户对中的发送用户到基站的信道增益，Hcidj是第i个蜂窝用户到第j个D2D用户对中的接收用户的信道增益，Hdj是第j个D2D用户对中的发送用户到接收用户的信道增益，λci是基站端信干噪比门限，λdj是第j个D2D用户对中的接收用户端的信干噪比门限，N0是用户带宽内噪声功率值。
  11. 如权利要求8所述的基站，其中，
    所述判断模块，还设置为判断计算出的D2D用户的发射功率和蜂窝用户的发射功率是否超过最大允许发射功率；
    所述选择模块，设置为在所述判断模块判断均未超过的情况下，为所述D2D用户对选择发射功率增加量最小的蜂窝用户的频谱资源进行复用。
  12. 如权利要求11所述的基站，所述基站还包括：
    发送模块，设置为向所述D2D用户发送第一调整信息；向对应的蜂窝用户发送第二调整信息；其中，所述第一调整信息包括所述计算出的D2D用户的发射功率，所述第二调整信息包括所述计算出的蜂窝用户的发射功率。
  13. 如权利要求8所述的基站，所述基站还包括：
    通知模块，设置为通知所述D2D用户选择复用的频谱资源。
  14. 如权利要求8至13任一项所述的基站，所述基站还包括：
    接收模块，设置为接收所述D2D用户对中的发送端发送的通信请求及所述D2D用户对中的接收用户发送的D2D链路的信道状态。
  15. 一种设备到设备D2D通信资源复用选择的方法，包括：
    D2D终端向基站发送通信请求；
    所述D2D终端接收到所述基站的通知后，复用所述基站选择的频谱资源。
  16. 如权利要求15所述的方法，所述方法还包括：
    所述D2D终端接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
  17. 一种设备到设备D2D通信资源复用选择的方法，包括：
    D2D终端向基站发送D2D链路的信道状态；
    所述D2D终端接收到所述基站的通知后，复用所述基站选择的频谱资源。
  18. 如权利要求17所述的方法，所述方法还包括：
    所述D2D终端接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
  19. 一种终端，支持设备到设备D2D技术，包括：
    第一发送模块，作为D2D用户对的发送端，设置为向基站发送通信请求；
    复用模块，设置为接收到所述基站的通知后，复用所述基站选择的频谱资源。
  20. 如权利要求19所述的终端，所述终端还包括：
    调整模块，设置为接收到所述基站的调整信息后，根据所述调整信息调整发射功率，其中，所述调整信息包括计算出的D2D用户的发射功率。
  21. 如权利要求19或20所述的终端，所述终端还包括：
    第二发送模块，作为D2D用户对的接收端，设置为向所述基站发送D2D链路的信道状态。
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