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WO2015131381A1 - 直接链路通信的方法、接入点和站点 - Google Patents

直接链路通信的方法、接入点和站点 Download PDF

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Publication number
WO2015131381A1
WO2015131381A1 PCT/CN2014/073013 CN2014073013W WO2015131381A1 WO 2015131381 A1 WO2015131381 A1 WO 2015131381A1 CN 2014073013 W CN2014073013 W CN 2014073013W WO 2015131381 A1 WO2015131381 A1 WO 2015131381A1
Authority
WO
WIPO (PCT)
Prior art keywords
sta
power
direct link
link communication
local noise
Prior art date
Application number
PCT/CN2014/073013
Other languages
English (en)
French (fr)
Inventor
林英沛
张佳胤
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/073013 priority Critical patent/WO2015131381A1/zh
Priority to CN201480064084.3A priority patent/CN105766042B/zh
Publication of WO2015131381A1 publication Critical patent/WO2015131381A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control

Definitions

  • the present invention relates to the field of communications and, more particularly, to a method of direct link communication, an Access Point (AP), and a station (STA). Background technique
  • WLAN Wireless Local Area Network
  • IEEE Institute of Electrical and Electronics Engineers 802.11
  • WiFi Wireless Fidelity
  • WiFi traces can be found everywhere in homes, hotspots, businesses, and WiFi networks deployed by carriers.
  • the popularity of WLAN-enabled smart terminals such as laptops, tablets, smartphones, digital cameras, and media players is increasing. These smart terminals bring convenience to people's work and life, but also bring great challenges to the development of WLAN technology.
  • the number of high-end WiFi applications is also rising.
  • the amount of information transmitted over a typical WiFi network is exploding.
  • WLAN services can be seen everywhere, resulting in increased congestion in the WLAN band.
  • the WLAN network uses a free unlicensed band. Due to the nature of this open spectrum, the use of free unlicensed spectrum is becoming increasingly tight. This places high demands on the spectrum efficiency of WLAN networks. Summary of the invention
  • Embodiments of the present invention provide a method, an access point, and a station for direct link communication, which can improve network efficiency.
  • a method for direct link communication including:
  • the AP determines the transmission resource of the direct link communication according to the transmission resource request; the AP determines the transmission power of the direct link communication and the transmission power of the third STA, where the transmission resource of the third STA and the direct chain The transmission resources of the road communication overlap, the transmission power of the direct link communication and the transmission power of the third STA enable the direct link communication and the third STA
  • the interference between the transmissions is lower than a predetermined value;
  • the AP sends first scheduling information to the first STA and the second STA, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, and sends the first to the third STA.
  • a second scheduling information where the second scheduling information indicates the transmission power of the third STA and the transmission resource of the third STA, so that the first STA and the second STA perform direct link communication according to the first scheduling information, where
  • the third STA transmits data according to the second scheduling information.
  • the method before the AP determines the transmit power of the direct link communication and the transmit power of the third STA, the method further includes:
  • the AP determines a local noise power of the AP
  • the AP receives the local noise power of the first STA and the link information between the first STA and the second STA, and receives the local noise power of the second STA sent by the second STA.
  • Determining, by the AP, the transmit power of the direct link communication and the transmit power of the third STA including: the AP according to link information between the first STA and the second STA, and between the AP and each STA Determining the transmission power of the direct link communication and the third STA, the link information, the location information of each STA, the local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA Transmit power.
  • the AP determines the transmit power of the direct link communication and the transmit power of the third STA, including: the AP according to the first Determining, by the link information between the STA and the second STA, the local noise power of the first STA, and the local noise power of the second STA, determining a transmit power of the direct link communication;
  • the AP is configured according to the transmit power of the direct link communication, the link information between the first STA and the second STA, the link information between the AP and the STA, the location information of each STA, The local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the third STA.
  • Determining the transmit power of the direct link communication and the transmit power of the third STA, the AP includes: determining, by the AP, the third STA according to link information between the AP and the third STA, and local noise power of the AP Transmit power
  • the AP is configured according to the sending power of the third STA, the link information between the first STA and the second STA, the link information between the AP and the STA, the location information of each STA, The local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the direct link communication.
  • the AP is configured according to the associated frame sent by the STA in the association process. Determining link information between the AP and each STA, including:
  • the AP determines the received signal strength of the associated frame according to the received signal power of the associated frame and the local noise power of the AP;
  • the AP determines link information between the AP and each STA according to the rated transmit power of the associated frame and the received signal strength of the associated frame.
  • a method for direct link communication including:
  • the first STA receives the first scheduling information sent by the AP, where the first scheduling information indicates the transmission resource of the direct link communication and the transmission power of the direct link communication, where the transmission power of the direct link communication and the first
  • the transmission power of the three STAs is determined by the AP, the transmission resource of the third STA overlaps with the transmission resource of the direct link communication, and the transmission power of the direct link communication and the transmission power of the third STA enable the direct link communication.
  • the interference with the transmission of the third STA is lower than a predetermined value;
  • the first STA performs direct link communication with the second STA using the transmission power of the direct link communication on the transmission resource of the direct link communication.
  • the transmit power of the direct link communication and the transmit power of the third STA are determined by the AP according to link information between the first STA and the second STA.
  • the local noise power of the STA and the local noise power of the second STA are determined; Before the first STA sends the transmission resource request of the direct link communication between the first STA and the second STA to the AP, the method further includes:
  • the first STA sends an association frame to the AP in the association process, so that the AP determines link information between the AP and the first STA.
  • the first STA sends a discovery request frame to the second STA at a rated power, and receives a discovery response frame sent by the second STA at a rated power;
  • the first STA sends the local noise power of the first STA and the link information between the first STA and the second STA to the AP.
  • the first STA determines, according to the discovery response frame, link information between the first STA and the second STA, Includes:
  • the first STA determines the received signal power of the discovery response frame according to the discovery response frame; the first STA determines the reception of the discovery response frame according to the received signal power of the discovery response frame and the local noise power of the first STA.
  • Signal strength the received signal power of the discovery response frame according to the discovery response frame; the first STA determines the reception of the discovery response frame according to the received signal power of the discovery response frame and the local noise power of the first STA.
  • the first STA determines link information between the first STA and the second STA according to the rated transmit power of the discovery response frame and the received signal strength of the discovery response frame.
  • an access point AP including:
  • a receiving module configured to receive a transmission resource request for direct link communication between the first STA and the second STA sent by the first STA;
  • a determining module configured to determine, according to the transmission resource request, a transmission resource of the direct link communication, and determine a transmission power of the direct link communication and a transmission power of the third STA, where the transmission resource of the third STA and the direct The transmission resources of the link communication overlap, the transmission power of the direct link communication and the transmission power of the third STA make the interference between the direct link communication and the transmission of the third STA mutually lower than a predetermined value;
  • a sending module configured to send first scheduling information to the first STA and the second STA, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, and the third scheduling information is sent to the third
  • the STA sends the second scheduling information, where the second scheduling information indicates the sending of the third STA. Sending power and transmission resources of the third STA, so that the first STA and the second STA perform direct link communication according to the first scheduling information, and the third STA sends data according to the second scheduling information.
  • the receiving module is further configured to receive location information of each STA sent by each of the first STA, the second STA, and the third STA Receiving, by the first STA, the local noise power of the first STA and the link information between the first STA and the second STA, and receiving the local noise power of the second STA sent by the second STA;
  • the determining module is further configured to determine a local noise power of the AP, and determine link information between the AP and each STA according to the associated frame sent by each STA in the association process;
  • the determining module is specifically configured to: according to link information between the first STA and the second STA, link information between the AP and each STA, location information of each STA, local noise of the AP The power, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the direct link communication and the transmit power of the third STA.
  • the determining module is specifically configured to: according to link information between the first STA and the second STA, the first STA Determining the transmit power of the direct link communication according to the local noise power and the local noise power of the second STA, according to the transmit power of the direct link communication, the link information between the first STA and the second STA, Determining the link information between the AP and the STA, location information of each STA, local noise power of the AP, local noise power of the first STA, and local noise power of the second STA The transmit power of the three STAs.
  • the determining module is specifically configured to: according to link information between the AP and the third STA, local noise power of the AP Determining the transmit power of the third STA, according to the transmit power of the third STA, link information between the first STA and the second STA, link information between the AP and the STA, The location information of each STA, the local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the direct link communication.
  • the determining module is specifically configured to determine, according to the associated frame, the receiving of the associated frame a signal power, determining a received signal strength of the associated frame according to a received signal power of the associated frame and a local noise power of the AP, according to the rated transmit power of the associated frame and the association
  • the received signal strength of the frame determines the link information between the AP and each of the STAs.
  • a site STA including:
  • a sending module configured to send, to the AP, a transmission resource request for direct link communication between the STA and the second STA;
  • a receiving module configured to receive first scheduling information sent by the AP, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, where the transmission power of the direct link communication is
  • the transmission power of the third STA is determined by the AP, the transmission resource of the third STA overlaps with the transmission resource of the direct link communication, and the transmission power of the direct link communication and the transmission power of the third STA make the direct link
  • the interference between the communication and the transmission of the third STA is lower than a predetermined value
  • an operation module configured to perform direct link communication with the second STA by using the transmit power of the direct link communication on the transmission resource of the direct link communication.
  • the transmit power of the direct link communication and the transmit power of the third STA are determined by the AP according to link information between the STA and the second STA, Link information between the AP and the STA, each of the second STA and the third STA, location information of each STA, local noise power of the AP, local noise power of the STA, and the The local noise power of the two STAs is determined;
  • the sending module is further configured to send the location information of the STA to the AP, and send an associated frame to the AP in the association process, so that the AP determines link information between the AP and the STA, and uses the rated power to the second.
  • the STA sends a discovery request frame;
  • the receiving module is further configured to receive a discovery response frame that is sent by the second STA at a rated power; the STA further includes:
  • a determining module configured to determine a local noise power of the STA, and determining link information between the STA and the second STA according to the discovery response frame;
  • the sending module is further configured to send, to the AP, local noise power of the STA and link information between the STA and the second STA.
  • the determining module is specifically configured to determine, according to the discovery response frame, a received signal power of the discovery response frame, according to the discovery response frame.
  • the received signal power and the local noise power of the STA determine the received signal strength of the discovery response frame
  • the chain between the STA and the second STA is determined according to the rated transmit power of the discovery response frame and the received signal strength of the discovery response frame.
  • Road information Based on the foregoing technical solution, the embodiment of the present invention determines that the direct link communication and the third STA transmit each other by determining the transmit power of the direct link communication of the first STA and the second STA and the transmit power of the third STA.
  • the interference is lower than the predetermined value, and the direct link communication between the first STA and the second STA can be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • FIG. 2 is a schematic flow chart of a method of direct link communication in accordance with one embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a method of direct link communication according to another embodiment of the present invention.
  • 4 is a schematic block diagram of an AP according to an embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of a STA according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an AP according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a STA according to an embodiment of the present invention. detailed description
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention.
  • STA 101, STA 102, and STA 103 are all associated with AP 100.
  • the Basic Service Set (BSS) established by the AP 100 operates with a scheduled channel access mechanism.
  • the AP 100 is responsible for scheduling and allocating transmission resources.
  • a normal link AP to STA or STA to AP
  • a direct link STA to STA
  • the STA 101 and the STA 102 belong to direct link communication
  • the STA 103 and the AP 100 belong to normal link communication.
  • the two-way communication may interfere with each other. It should be understood that, in the embodiment of the present invention, the overlapping of transmission resources indicates that the transmission resources are identical or partially identical.
  • the method 200 includes:
  • the AP receives a transmission resource request for direct link communication between the first STA and the second STA that is sent by the first STA.
  • the AP determines, according to the transmission resource request, a transmission resource of the direct link communication;
  • S230 the AP determines a transmission power of the direct link communication and a transmission power of the third STA, where the transmission resource of the third STA Intersecting with the transmission resource of the direct link communication, the transmission power of the direct link communication and the transmission power of the third STA make the interference between the direct link communication and the transmission of the third STA mutually lower than a predetermined value;
  • the AP sends first scheduling information to the first STA and the second STA, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, and the third STA is sent to the third STA. Transmitting the second scheduling information, where the second scheduling information indicates the sending power of the third STA and the transmission resource of the third STA, so that the first STA and the second STA perform direct link communication according to the first scheduling information.
  • the third STA sends data according to the second scheduling information.
  • the executor AP of the method 200 may be the AP 100 in FIG. 1, and the first STA, the second STA, and the third STA may be the STA 101, the STA 102, and the STA 103 in FIG. 1, respectively.
  • the transmission of the third STA may be a third STA to AP transmission, or may be a direct link communication between the third STA and other STAs (such as a fourth STA), which is not limited by the present invention.
  • the first STA and the second STA When the first STA and the second STA are to perform direct link communication, the first STA (or the second STA) sends a transmission resource request of the direct link communication to the AP, and requests the AP to transmit the resource. After receiving the transmission resource request, the AP allocates transmission resources for the direct link communication.
  • the AP determines the transmission power of the direct link communication and the transmission power of the third STA, so that the interference between the direct link communication and the transmission of the third STA is lower than a predetermined value. That is, the interference of the direct link communication to the transmission of the third STA is lower than a predetermined value and the interference of the transmission of the third STA to the direct link communication is lower than a predetermined value.
  • the AP sends first scheduling information to the first STA and the second STA, where the first scheduling information indicates the transmission resource of the direct link communication and the transmission power of the direct link communication, and sends the transmission power to the third STA.
  • the second scheduling information indicates the transmission power of the third STA and the transmission resource of the third STA.
  • the first The first STA and the second STA perform direct link communication according to the first scheduling information, that is, the first STA and the second STA use the first scheduling on the transmission resource of the direct link communication indicated by the first scheduling information.
  • the transmission power of the direct link communication indicated by the information is communicated.
  • the third STA sends data according to the second scheduling information, that is, the third STA uses the transmission power of the third STA indicated by the second scheduling information to transmit data on the transmission resource of the third STA indicated by the second scheduling information. Since the transmission power of the direct link communication determined by the AP and the transmission power of the third STA make the interference between the direct link communication and the transmission of the third STA mutually lower than a predetermined value, the first STA and the first The direct link communication of the two STAs can be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • the method for direct link communication is determined by determining the transmit power of the direct link communication of the first STA and the second STA and the transmit power of the third STA.
  • the interference between the transmissions is lower than a predetermined value, and the direct link communication between the first STA and the second STA can be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • the AP may determine the transmit power of the direct link communication and the transmit power of the third STA according to the location information of each STA.
  • the AP determines the transmit power of the direct link communication and the transmit power of the third STA, including:
  • the AP is configured according to link information between the first STA and the second STA, link information between the AP and each STA, location information of each STA, local noise power of the AP, and the The local noise power of a STA and the local noise power of the second STA determine the transmit power of the direct link communication and the transmit power of the third STA.
  • the AP first acquires link information between the first STA and the second STA, link information between the AP and each STA, location information of each STA, and the AP.
  • the method 200 further includes: before the AP determines the transmit power of the direct link communication and the transmit power of the third STA, the method 200 further includes:
  • the AP determines a local noise power of the AP
  • the AP receives the local noise power of the first STA and the link information between the first STA and the second STA, and receives the local noise power of the second STA sent by the second STA.
  • the AP first estimates the local noise power of the AP. For example, the AP can estimate the local noise power by calculating the average noise power indicator (ANPI).
  • ANPI average noise power indicator
  • the estimation method of ANPI is the same as that calculated in the current standard.
  • Each STA reports its location information to the AP during the association process. It should be understood that the STA may also report its own location information at other times, which is not limited by the present invention.
  • the AP estimates link information, such as fading information, between each STA and the AP according to the associated frame sent by each STA.
  • the AP determines the link information between the AP and each STA according to the associated frame sent by the STA in the association process, including:
  • the AP determines the received signal strength of the associated frame according to the received signal power of the associated frame and the local noise power of the AP;
  • the AP determines link information between the AP and each STA according to the rated transmit power of the associated frame and the received signal strength of the associated frame.
  • the AP estimates the received channel power indicator (RCPI) through the associated frame with which the STA interacts.
  • the RCPI estimation method is also the same as the calculation method in the current standard.
  • the AP obtains the received signal strength by subtracting the RCPI from the ANPI. Since the interaction of the associated frame is transmitted at the rated power, the link information between the AP and the STA can be obtained by subtracting the received signal strength from the rated power.
  • Each STA estimates its own local noise power and saves it. For example, the STA can also estimate the local noise power by calculating the ANPI.
  • Each STA needs to demodulate the Medium Access Control (MAC) header for each frame that can be received to determine if the frame is sent to itself. Based on this information, the STA determines the STAs that it can hear and records these STAs. For example, the first STA can hear the information of the second STA and find that the second STA is in its neighboring area. When there is a service between the first STA and the second STA, the first STA first determines whether the second STA is in the STA list of its neighboring area. If not, abandon the establishment of a direct link and then communicate over the normal link. If it is in the list, the discovery request frame is sent to the second STA at the rated power, for example, a Device to Device (D2D) Discovery Request frame.
  • D2D Device to Device
  • the second STA replies with a discovery response frame at a rated power, for example, a D2D Discovery Response frame.
  • the first STA and the second STA estimate link information, such as fading information, between the D2D Discovery Request frame and the D2D Discovery Response frame according to the interaction between the D2D Discovery Request frame and the D2D Discovery Response frame.
  • the first STA and the second STA establish a direct link communication relationship, and report the locally saved noise power and the link information between the two STAs to the AP, where the link information between the first STA and the second STA may be It is sent to the AP by any one of the first STA and the second STA.
  • the first STA and the second STA When the first STA and the second STA are to perform direct link communication, the first STA (or the second STA) sends a transmission resource request of the direct link communication to the AP, and requests the transmission resource from the AP. After receiving the transmission resource request, the AP allocates transmission resources for the direct link communication. At the same time, the AP selects the third STA, for example, selects a STA that is farther away from the first STA and the second STA. The AP allocates, to the third STA, a transmission resource that overlaps with the transmission resource of the direct link communication. In order to simultaneously schedule the third STA whose transmission resource overlaps with the transmission resource of the direct link communication, the AP determines the transmission power of the direct link communication and the transmission power of the third STA.
  • the AP obtains, according to the previously obtained link information between the first STA and the second STA, link information between the AP and the STA, location information of each STA, and locality of the AP. Determining, by the noise power, the local noise power of the first STA, and the local noise power of the second STA, the transmit power of the direct link communication and the transmit power of the third STA, so that the direct link communication and the third STA The interference between the transmissions is below a predetermined value.
  • the interference of the direct link communication between the STA 101 and the STA 102 to the transmission of the STA 103 and the AP 100 is STA 101 and
  • the AP 100 receives the data transmitted by the STA 103 and the STA 103 receives the data transmitted by the AP 100, and can use the power of the direct link communication, the transmission power of the STA 103, the AP and the The link information between each STA, the local noise power of the AP is represented; the interference of the transmission of the STA 103 and the AP 100 to the direct link communication between the STA 101 and the STA 102 is that the STA 103 transmits data and the AP to the AP 100.
  • the STA 101 receives the data of the STA 102 and the STA 102 receives the data of the STA 101.
  • the power of the direct link communication, the transmission power of the STA 103, the chain between the STA 101 and the STA 102 can be used.
  • Road information, link information between STA 103 and STA 101, link information between STA 103 and STA 101, local noise power of STA 101, and STA 102 The local noise power is shown, wherein the link information between the STA 103 and the STA 101, and the link information between the STA 103 and the STA 101 can be link information between the AP and each STA and each STA
  • the location information is calculated.
  • the AP determines the transmission power of the direct link communication and the transmission power of the third STA under the condition that the interference between the direct link communication and the transmission of the third STA is lower than a predetermined value.
  • the AP may determine the transmit power of the direct link communication and then determine the transmit power of the third STA, or determine the transmit power of the third STA and then determine the transmit power of the direct link communication.
  • the AP determines the transmit power of the direct link communication and the transmit power of the third STA, including:
  • the AP is configured according to the transmit power of the direct link communication, the link information between the first STA and the second STA, the link information between the AP and the STA, the location information of each STA, The local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the third STA.
  • the AP determines the direct link communication according to the link information between the first STA and the second STA, the local noise power of the first STA, and the local noise power of the second STA. Transmitting power, according to the transmission power of the direct link communication, between the first STA and the second STA, under the condition that the interference between the direct link communication and the transmission of the third STA is lower than a predetermined value
  • Link information link information between the AP and each STA, location information of each STA, local noise power of the AP, local noise power of the first STA, and local noise power of the second STA , determining the transmit power of the third STA.
  • the AP determines the transmit power of the direct link communication and the transmit power of the third STA, including:
  • the AP determines the transmit power of the third STA according to the link information between the AP and the third STA and the local noise power of the AP.
  • the AP is configured according to the sending power of the third STA, the link information between the first STA and the second STA, the link information between the AP and the STA, the location information of each STA, The local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the direct link communication.
  • the AP first determines the transmit power of the third STA according to the link information between the AP and the third STA, and the local noise power of the AP, and then in the direct link communication and the third STA.
  • the transmission power of the third STA, the link information between the first STA and the second STA, and the chain between the AP and the STA are performed on a condition that the interference between the APs is lower than a predetermined value.
  • the path information, the location information of each STA, the local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmission power of the direct link communication.
  • the first STA and the second STA may also determine the transmit power of the direct link communication and send the power to the AP.
  • the AP selects the third STA according to the transmit power of the direct link communication and determines the transmit power of the third STA. .
  • the transmission resource may be indicated only in the scheduling information sent to the first STA and the second STA; if the AP determines the transmission of the direct link communication If the power is not suitable, the transmission power of the direct link communication may be re-determined, and the transmission power of the transmission resource and the re-determined direct link communication is indicated in the scheduling information transmitted to the first STA and the second STA.
  • the method for direct link communication in the embodiment of the present invention the direct link communication and the transmission of the third STA are determined by determining the transmit power of the direct link communication of the first STA and the second STA and the transmit power of the third STA.
  • the mutual interference is lower than the predetermined value, and the direct link communication between the first STA and the second STA can be simultaneously performed with the transmission of the third STA, so that the spectrum resources can be fully utilized, thereby improving network efficiency.
  • the method for direct link communication in the embodiment of the present invention is described in detail above from the perspective of the AP.
  • the method for direct link communication in the embodiment of the present invention is described in detail below from the perspective of the first STA.
  • FIG. 3 shows a schematic flow diagram of a method 300 of direct link communication in accordance with an embodiment of the present invention. As shown in FIG. 3, the method 300 includes:
  • the first STA sends a transmission resource request for direct link communication between the first STA and the second STA to the AP.
  • the first STA receives the first scheduling information sent by the AP, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, where the transmission power of the direct link communication
  • the transmission power of the third STA is determined by the AP, the transmission resource of the third STA overlaps with the transmission resource of the direct link communication, and the transmission power of the direct link communication and the transmission power of the third STA enable the direct chain
  • the interference between the road communication and the transmission of the third STA is lower than a predetermined value; S330.
  • the first STA performs direct link communication with the second STA by using the transmit power of the direct link communication on the transmission resource of the direct link communication.
  • the first STA of the method 300 may be the STA 101 or the STA 102 in FIG. 1
  • the second STA may be the STA 102 or the STA 101
  • the third STA may be in FIG. 1 .
  • the STA 103; the AP may be the AP 100 in FIG.
  • the first STA and the second STA are to perform direct link communication
  • the first STA sends a transmission resource request of the direct link communication to the AP, and requests the transmission resource from the AP.
  • the AP allocates transmission resources for the direct link communication.
  • the AP selects a third STA, for example, selecting a STA that is farther away from the first STA and the second STA.
  • the AP allocates, to the third STA, a transmission resource that overlaps with the transmission resource of the direct link communication.
  • the AP In order to simultaneously schedule the third STA, the AP - and determine the transmission power of the direct link communication and the transmission power of the third STA, so that the interference between the direct link communication and the transmission of the third STA is lower than a predetermined value That is, the interference of the direct link communication to the transmission of the third STA is lower than a predetermined value and the interference of the transmission of the third STA to the direct link communication is lower than a predetermined value.
  • the AP sends first scheduling information to the first STA and the second STA, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, and sends a second to the third STA. Scheduling information indicating the transmission power of the third STA and the transmission resource of the third STA.
  • the first STA receives the first scheduling information sent by the AP, and performs direct link communication with the second STA by using the transmit power of the direct link communication on the transmission resource of the direct link communication. Since the transmission power of the direct link communication determined by the AP and the transmission power of the third STA make the interference between the direct link communication and the transmission of the third STA mutually lower than a predetermined value, the first STA and the first The direct link communication of the two STAs can be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • the method for direct link communication directly determines that the direct link communication between the first STA and the second STA and the transmission of the third STA are less than a predetermined value by using the AP.
  • the direct communication of the transmission power of the road communication enables the direct link communication between the first STA and the second STA to be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • the transmit power of the direct link communication and the transmit power of the third STA are determined by the AP according to link information between the first STA and the second STA, and the AP Link information between the first STA, the second STA, and each of the third STAs, location information of each STA, local noise power of the AP, local noise of the first STA The power and the local noise power of the second STA are determined.
  • the method 300 before the first STA sends the transmission resource request of the direct link communication between the first STA and the second STA to the AP, the method 300 further includes:
  • the first STA sends an association frame to the AP in the association process, so that the AP determines link information between the AP and the first STA.
  • the first STA sends a discovery request frame to the second STA at a rated power, and receives a discovery response frame sent by the second STA at a rated power;
  • the first STA sends the local noise power of the first STA and the link information between the first STA and the second STA to the AP.
  • the first STA reports its location information to the AP during the association process.
  • the AP estimates link information, such as fading information, between the first STA and the AP according to the associated frame sent by the first STA.
  • the first STA estimates its own local noise power and saves it. For example, the first STA can estimate the local noise power by calculating the ANPI.
  • Each STA needs to demodulate the MAC frame header for each frame that can be received to determine if the frame is sent to itself. Based on this information, the STA determines the STAs that it can hear and records these STAs. For example, the first STA can hear the information of the second STA and find that the second STA is in its neighboring area. When there is a service between the first STA and the second STA, the first STA first determines whether the second STA is in the STA list of its neighboring area. If not, abandon the establishment of a direct link and then communicate over the normal link. If it is in the list, a discovery request frame, for example, a D2D Discovery Request frame, is transmitted to the second STA at the rated power.
  • a discovery request frame for example, a D2D Discovery Request frame
  • the second STA replies to the discovery response frame with a rated power, for example, a D2D Discovery Response frame.
  • the first STA and the second STA estimate link information, such as fading information, between the two according to the interaction between the D2D Discovery Request frame and the D2D Discovery Response frame.
  • the determining, by the first STA, the link information between the first STA and the second STA according to the discovery response frame including:
  • the first STA determines link information between the first STA and the second STA according to the rated transmit power of the discovery response frame and the received signal strength of the discovery response frame.
  • the first STA estimates the RCPI by finding the response frame, and subtracts the ANPI from the RCPI to obtain the received signal strength. Since the discovery request frame and the discovery response frame are transmitted at rated power, the link information between the direct link communication pairs can be estimated by subtracting the received signal strength from the rated power.
  • the link information between the first STA and the second STA may be determined according to the discovery request frame.
  • the first STA and the second STA establish a direct link communication relationship, and report the locally saved noise power and the link information between the two STAs to the AP, where the link information between the first STA and the second STA may be It is sent to the AP by any one of the first STA and the second STA, for example, sent by the first STA.
  • the first STA and the second STA are to perform direct link communication
  • the first STA sends a transmission resource request of the direct link communication to the AP, and requests the transmission resource from the AP.
  • the AP allocates transmission resources for the direct link communication.
  • the AP determines the transmission power of the direct link communication and the transmission power of the third STA. Specifically, the AP obtains link information between the first STA and the second STA, link information between the AP and each STA, location information of each STA, and local noise of the AP.
  • the interference of the direct link communication between the STA 101 and the STA 102 to the transmission of the STA 103 and the AP 100 is STA 101 and
  • the AP 100 receives the data transmitted by the STA 103 and the STA 103 receives the data transmitted by the AP 100, and can use the power of the direct link communication, the transmission power of the STA 103, the AP and the The link information between each STA, the local noise power of the AP is represented; the interference of the transmission of the STA 103 and the AP 100 to the direct link communication between the STA 101 and the STA 102 is that the STA 103 transmits data and the AP to the AP 100.
  • the 100 receives the data of the STA 102 and the STA 102 receives the STA 101 when transmitting data to the STA 103
  • the link information between 101, the local noise power of the STA 101, and the local noise power of the STA 102 are shown, wherein the link information between the STA 103 and the STA 101, and the link information between the STA 103 and the STA 101 It can be calculated by the link information between the AP and each STA and the location information of each STA.
  • the AP determines the transmission power of the direct link communication and the transmission power of the third STA under the condition that the interference between the direct link communication and the transmission of the third STA is lower than a predetermined value.
  • the first STA performs direct link communication with the second STA using the transmission power of the direct link communication.
  • the method for direct link communication according to the embodiment of the present invention, the direct link communication that causes the direct link communication between the first STA and the second STA and the transmission of the third STA to be less than a predetermined value by using the AP
  • the transmission power of the direct link communication enables the direct link communication between the first STA and the second STA to be performed simultaneously with the transmission of the third STA, so that the spectrum resources can be fully utilized, thereby improving network efficiency.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • FIG. 4 shows a schematic block diagram of an AP 400 in accordance with an embodiment of the present invention.
  • the AP 400 includes:
  • the receiving module 410 is configured to receive, by the first station STA, a transmission resource request for direct link communication between the first STA and the second STA;
  • a determining module 420 configured to determine, according to the transmission resource request, a transmission resource of the direct link communication, and determine a transmission power of the direct link communication and a transmission power of the third STA, where the transmission resource of the third STA is The transmission resources of the direct link communication overlap, the transmission power of the direct link communication and the transmission power of the third STA make the interference between the direct link communication and the transmission of the third STA mutually lower than a predetermined value;
  • the sending module 430 is configured to send first scheduling information to the first STA and the second STA, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, and the The third STA sends the second scheduling information, where the second scheduling information indicates the sending power of the third STA and the transmission resource of the third STA, so that the first STA and the second STA perform direct chain according to the first scheduling information.
  • the third STA sends data according to the second scheduling information.
  • the AP of the embodiment of the present invention determines the interference between the direct link communication and the transmission of the third STA by determining the transmission power of the direct link communication of the first STA and the second STA and the transmission power of the third STA. Below the predetermined value, the direct link communication of the first STA and the second STA can be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • the receiving module 410 is further configured to receive location information of each STA sent by each of the first STA, the second STA, and the third STA, and receive the location information.
  • the local noise power of the first STA and the link information between the first STA and the second STA sent by the first STA receive the local noise power of the second STA sent by the second STA;
  • the determining module 420 And determining the local noise power of the AP, and determining link information between the AP and each STA according to the associated frame sent by each STA in the association process;
  • the determining module 420 is specifically configured to: according to link information between the first STA and the second STA, link information between the AP and each STA, location information of each STA, local to the AP The noise power, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the direct link communication and the transmit power of the third STA.
  • the determining module 420 is specifically configured to: according to link information between the first STA and the second STA, local noise power of the first STA, and local to the second STA a noise power, determining a transmit power of the direct link communication, according to a transmit power of the direct link communication, link information between the first STA and the second STA, and a chain between the AP and each STA
  • the path information, the location information of each STA, the local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the third STA.
  • the determining module 420 is specifically configured to determine, according to the link information between the AP and the third STA, the local noise power of the AP, the sending power of the third STA, according to The transmit power of the third STA, the link information between the first STA and the second STA, the link information between the AP and the STA, the location information of each STA, The local noise power of the AP, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the direct link communication.
  • the determining module 420 is specifically configured to determine, according to the associated frame, a received signal power of the associated frame, and determine the associated frame according to the received signal power of the associated frame and the local noise power of the AP.
  • the received signal strength determines the link information between the AP and the STA according to the rated transmit power of the associated frame and the received signal strength of the associated frame.
  • the AP 400 may correspond to an AP in a method of direct link communication according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the AP 400 are respectively implemented to implement the foregoing respective methods.
  • the corresponding process, for the sake of cleanliness, will not be repeated here.
  • the AP of the embodiment of the present invention determines the interference between the direct link communication and the transmission of the third STA by determining the transmission power of the direct link communication of the first STA and the second STA and the transmission power of the third STA. Below the predetermined value, the direct link communication of the first STA and the second STA can be performed simultaneously with the transmission of the third STA, so that the spectrum resources can be fully utilized, thereby improving network efficiency.
  • FIG. 5 shows a schematic block diagram of a STA 500 in accordance with an embodiment of the present invention.
  • the STA 500 includes:
  • the sending module 510 is configured to send, to the access point AP, a transmission resource request for direct link communication between the STA and the second STA;
  • the receiving module 520 is configured to receive first scheduling information that is sent by the AP, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, where the transmission power of the direct link communication
  • the transmission power of the third STA is determined by the AP, the transmission resource of the third STA overlaps with the transmission resource of the direct link communication, and the transmission power of the direct link communication and the transmission power of the third STA enable the direct chain
  • the interference between the road communication and the transmission of the third STA is lower than a predetermined value;
  • the operation module 530 is configured to perform direct link communication with the second STA by using the transmit power of the direct link communication on the transmission resource of the direct link communication.
  • the STA of the embodiment of the present invention directly directs the transmission power of the direct link communication in which the direct link communication between the STA and the second STA and the transmission of the third STA are less than a predetermined value by using the AP.
  • the direct link communication between the STA and the second STA can be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • the transmit power of the direct link communication and the third STA is determined by the AP according to the link information between the STA and the second STA, the link information between the AP and the STA, the second STA, and each of the STAs in the third STA.
  • the location information of the STA, the local noise power of the AP, the local noise power of the STA, and the local noise power of the second STA are determined;
  • the sending module 510 is further configured to send the location information of the STA to the AP, and send an associated frame to the AP in the association process, so that the AP determines link information between the AP and the STA, and uses the rated power to the first Two STAs send a discovery request frame;
  • the receiving module 520 is further configured to receive a discovery response frame that is sent by the second STA at a rated power; the STA 500 further includes:
  • a determining module configured to determine a local noise power of the STA, and determining link information between the STA and the second STA according to the discovery response frame;
  • the sending module 510 is further configured to send, to the AP, local noise power of the STA and link information between the STA and the second STA.
  • the determining module is specifically configured to determine, according to the discovery response frame, the received signal power of the discovery response frame, and determine the received signal power of the discovery response frame and the local noise power of the STA.
  • the received signal strength of the response frame is found, and the link information between the STA and the second STA is determined according to the rated transmit power of the discovery response frame and the received signal strength of the discovery response frame.
  • the first STA in the method of the letter, and the above-mentioned and other operations and/or functions of the respective modules in the STA 500 are respectively omitted in order to implement the corresponding processes of the foregoing respective methods.
  • the STA of the embodiment of the present invention directly directs the transmission power of the direct link communication in which the direct link communication between the STA and the second STA and the transmission of the third STA are less than a predetermined value by using the AP.
  • the direct link communication between the STA and the second STA can be performed simultaneously with the transmission of the third STA, so that the spectrum resources can be fully utilized, thereby improving network efficiency.
  • FIG. 6 shows a structure of an AP according to still another embodiment of the present invention, including at least one processor 602 (for example, a CPU), at least one network interface 605 or other communication interface, a memory 606, and at least one communication bus 603. To achieve connection communication between these components.
  • the processor 602 is configured to execute executable modules, such as computer programs, stored in the memory 606.
  • the memory 606 may include a random access memory (RAM: Random Access Memory), and may also include A non-volatile memory, such as at least one disk storage.
  • a communication connection with at least one other network element is achieved by at least one network interface 605 (which may be wired or wireless).
  • memory 606 stores program 6061, and processor 602 executes program 6061 for performing the following operations:
  • the network interface 605 Transmitting, by the network interface 605, the first scheduling information to the first STA and the second STA, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, and is sent to the third STA Transmitting the second scheduling information, where the second scheduling information indicates the sending power of the third STA and the transmission resource of the third STA, so that the first STA and the second STA perform direct link communication according to the first scheduling information.
  • the third STA sends data according to the second scheduling information.
  • processor 602 is further configured to:
  • the processor 602 is specifically configured to: according to link information between the first STA and the second STA, link information between the AP and each STA, location information of each STA, local noise of the AP The power, the local noise power of the first STA, and the local noise power of the second STA determine the transmit power of the direct link communication and the transmit power of the third STA.
  • the processor 602 is specifically configured to:
  • the transmit power of the direct link communication Determining, according to the link information between the first STA and the second STA, the local noise power of the first STA, and the local noise power of the second STA, the transmit power of the direct link communication; according to the direct link Transmit power of communication, link information between the first STA and the second STA, link information between the AP and the STA, location information of each STA, local noise power of the AP, The local noise power of the first STA and the local noise power of the second STA determine the transmit power of the third STA.
  • the processor 602 is specifically configured to:
  • the transmit power of the third STA determines the transmit power of the direct link communication.
  • the processor 602 is specifically configured to:
  • the embodiment of the present invention determines the direct link communication and the transmit power of the third STA by determining the transmit power of the direct link communication of the first STA and the second STA.
  • the interference between the transmissions of the third STAs is lower than a predetermined value, and the direct link communication between the first STA and the second STA can be performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • FIG. 7 shows a structure of a STA according to still another embodiment of the present invention, including at least one processor 702 (for example, a CPU), at least one network interface 705 or other communication interface, a memory 706, and at least one communication bus 703. To achieve connection communication between these components.
  • the processor 702 is configured to execute executable modules, such as computer programs, stored in the memory 706.
  • the memory 706 may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory such as at least one disk memory.
  • a communication connection with at least one other network element is achieved by at least one network interface 705 (which may be wired or wireless).
  • memory 706 stores program 7061, and processor 702 executes program 7061 for performing the following operations:
  • first scheduling information that is sent by the AP, where the first scheduling information indicates a transmission resource of the direct link communication and a transmission power of the direct link communication, where a transmission power of the direct link communication and a
  • the transmission power of the three STAs is determined by the AP, the transmission resource of the third STA overlaps with the transmission resource of the direct link communication, and the transmission power of the direct link communication and the transmission power of the third STA enable the direct link communication.
  • the interference with the transmission of the third STA is lower than a predetermined value;
  • the direct link communication is performed with the second STA using the transmission power of the direct link communication on the transmission resource of the direct link communication.
  • the transmit power of the direct link communication and the transmit power of the third STA are determined by the AP according to link information between the STA and the second STA, the AP and the STA, the second STA, and the Link information between each STA in the third STA, location information of each STA, local noise power of the AP, local noise power of the STA, and local noise power of the second STA are determined;
  • the processor 702 is also used to,
  • processor 702 is specifically configured to:
  • the AP determines that the direct link communication between the direct link communication of the first STA and the second STA and the transmission of the third STA is less than a predetermined value, and the direct link communication is performed, and the first STA may be enabled.
  • the direct link communication with the second STA is performed simultaneously with the transmission of the third STA, thereby improving network efficiency.
  • the term "and/or” is merely an association describing the associated object, indicating that there may be three relationships.
  • a and / or B can mean: A exists separately, there are A and B, and there are three cases of B alone.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separate.
  • the components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

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Abstract

本发明公开了一种直接链路通信的方法、接入点和站点。该方法包括：AP接收第一STA发送的该第一STA和第二STA之间的直接链路通信的传输资源请求；该AP根据该传输资源请求，确定该直接链路通信的传输资源；该AP确定该直接链路通信的发送功率以及第三STA的发送功率，该直接链路通信的发送功率和该第三STA的发送功率使该直接链路通信和该第三STA的传输相互之间的干扰低于预定值；该AP向该第一STA和该第二STA发送第一调度信息，该第一调度信息指示该直接链路通信的传输资源和该直接链路通信的发送功率，并向该第三STA发送第二调度信息，该第二调度信息指示该第三STA的发送功率和该第三STA的传输资源。本发明实施例能够提升网络效率。

Description

直接链路通信的方法、 接入点和站点 技术领域
本发明涉及通信领域， 并且更具体地， 涉及直接链路通信的方法、 接入 点 ( Access Point, AP )和占点 ( station, STA )。 背景技术
由于网络技术和移动设备的飞速发展， 基于电气和电子工程协会 ( Institute of Electrical and Electronics Engineers , IEEE ) 802.11标准的无线局 域网 （ Wireless Local Area Network, WLAN )技术得到了长足的发展和广泛 的应用。 如今， 全世界有超过 17%的人口利用无线保真（Wireless Fidelity, WiFi )进行网络连接， 每年有超过十亿的 WiFi设备交付市场。 家庭、 热点、 企业以及运营商部署的 WiFi网络随处可见 WiFi的踪迹。 便携电脑、 平板电 脑、 智能手机、 数码相机、 媒体播放器等带有 WLAN功能的智能终端的普 及率越来越高。 这些智能终端给人们的工作和生活带来便利的同时， 也给 WLAN技术的发展带来了很大的挑战。 同时， WiFi高端应用的数量也在不 断攀升。 通过典型 WiFi网络进行传输的信息总量正在爆炸式地增长。 然而， WLAN业务的随处可见， 带来的是 WLAN频段的日益拥塞。 WLAN网络使 用的是免费非授权频段。 由于这种开放频谱的特性， 使得免费非授权频谱使 用日益紧张。 这对 WLAN网络的频谱使用效率提出了很高的要求。 发明内容
本发明实施例提供了一种直接链路通信的方法、 接入点和站点， 能够提 升网络效率。
第一方面， 提供了一种直接链路通信的方法， 包括：
AP接收第一 STA发送的该第一 STA和第二 STA之间的直接链路通信 的传输资源请求；
该 AP根据该传输资源请求， 确定该直接链路通信的传输资源； 该 AP确定该直接链路通信的发送功率以及第三 STA的发送功率，其中， 该第三 STA 的传输资源与该直接链路通信的传输资源重叠， 该直接链路通 信的发送功率和该第三 STA的发送功率使该直接链路通信和该第三 STA的 传输相互之间的干扰低于预定值；
该 AP向该第一 STA和该第二 STA发送第一调度信息， 该第一调度信 息指示该直接链路通信的传输资源和该直接链路通信的发送功率， 并向该第 三 STA发送第二调度信息， 该第二调度信息指示该第三 STA的发送功率和 该第三 STA的传输资源， 以使该第一 STA和该第二 STA根据该第一调度信 息进行直接链路通信， 该第三 STA根据该第二调度信息发送数据。
结合第一方面， 在第一种可能的实现方式中， 在该 AP确定该直接链路 通信的发送功率以及第三 STA的发送功率之前， 该方法还包括：
该 AP确定该 AP的本地噪声功率；
该 AP接收该第一 STA、 该第二 STA和该第三 STA中的每个 STA发送 的该每个 STA的位置信息；
该 AP根据该每个 STA在关联过程中发送的关联帧， 确定该 AP与该每 个 STA之间的链路信息；
该 AP接收该第一 STA发送的该第一 STA的本地噪声功率以及该第一 STA和该第二 STA之间的链路信息，接收该第二 STA发送的该第二 STA的 本地噪声功率；
该 AP确定该直接链路通信的发送功率以及第三 STA的发送功率，包括： 该 AP根据该第一 STA和该第二 STA之间的链路信息、该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该 第一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该直接链 路通信的发送功率以及第三 STA的发送功率。
结合第一方面的第一种可能的实现方式， 在第二种可能的实现方式中， 该 AP确定该直接链路通信的发送功率以及第三 STA的发送功率， 包括： 该 AP根据该第一 STA和该第二 STA之间的链路信息、 该第一 STA的 本地噪声功率以及该第二 STA 的本地噪声功率， 确定该直接链路通信的发 送功率；
该 AP根据该直接链路通信的发送功率、 该第一 STA和该第二 STA之 间的链路信息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置 信息、该 AP的本地噪声功率、该第一 STA的本地噪声功率以及该第二 STA 的本地噪声功率， 确定该第三 STA的发送功率。
结合第一方面的第一种可能的实现方式， 在第三种可能的实现方式中， 该 AP确定该直接链路通信的发送功率以及第三 STA的发送功率， 包括： 该 AP根据该 AP与该第三 STA之间的链路信息、 该 AP的本地噪声功 率， 确定该第三 STA的发送功率；
该 AP根据该第三 STA的发送功率、 该第一 STA和该第二 STA之间的 链路信息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本 地噪声功率， 确定该直接链路通信的发送功率。
结合第一方面的第一至三种可能的实现方式中的任一种可能的实现方 式， 在第四种可能的实现方式中， 该 AP根据该每个 STA在关联过程中发送 的关联帧， 确定该 AP与该每个 STA之间的链路信息， 包括：
该 AP根据该关联帧， 确定该关联帧的接收信号功率；
该 AP根据该关联帧的接收信号功率和该 AP的本地噪声功率， 确定该 关联帧的接收信号强度；
该 AP根据该关联帧的额定发送功率和该关联帧的接收信号强度， 确定 该 AP与该每个 STA之间的链路信息。
第二方面， 提供了一种直接链路通信的方法， 包括：
第一 STA向 AP发送该第一 STA和第二 STA之间的直接链路通信的传 输资源请求；
该第一 STA接收该 AP发送的第一调度信息，该第一调度信息指示该直 接链路通信的传输资源和该直接链路通信的发送功率， 其中， 该直接链路通 信的发送功率和第三 STA的发送功率由该 AP确定， 该第三 STA的传输资 源与该直接链路通信的传输资源重叠， 该直接链路通信的发送功率和该第三 STA的发送功率使该直接链路通信和该第三 STA的传输相互之间的干扰低 于预定值；
该第一 STA在该直接链路通信的传输资源上使用该直接链路通信的发 送功率与该第二 STA进行直接链路通信。
结合第二方面， 在第一种可能的实现方式中， 该直接链路通信的发送功 率和该第三 STA的发送功率由该 AP根据该第一 STA和该第二 STA之间的 链路信息、 该 AP与该第一 STA、 该第二 STA和该第三 STA中的每个 STA 之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一
STA的本地噪声功率以及该第二 STA的本地噪声功率确定； 在该第一 STA向 AP发送该第一 STA和第二 STA之间的直接链路通信 的传输资源请求之前， 该方法还包括：
该第一 STA向该 AP发送该第一 STA的位置信息；
该第一 STA在关联过程中向该 AP发送关联帧， 以使该 AP确定该 AP 与该第一 STA之间的链路信息；
该第一 STA确定该第一 STA的本地噪声功率；
该第一 STA以额定功率向该第二 STA发送发现请求帧，接收该第二 STA 以额定功率发送的发现响应帧；
该第一 STA根据该发现响应帧， 确定该第一 STA和该第二 STA之间的 链路信息；
该第一 STA向该 AP发送该第一 STA的本地噪声功率以及该第一 STA 和该第二 STA之间的链路信息。
结合第二方面的第一种可能的实现方式， 在第二种可能的实现方式中， 该第一 STA根据该发现响应帧， 确定该第一 STA和该第二 STA之间的链路 信息， 包括：
该第一 STA根据该发现响应帧， 确定该发现响应帧的接收信号功率； 该第一 STA根据该发现响应帧的接收信号功率和该第一 STA的本地噪 声功率， 确定该发现响应帧的接收信号强度；
该第一 STA根据该发现响应帧的额定发送功率和该发现响应帧的接收 信号强度， 确定该第一 STA和该第二 STA之间的链路信息。
第三方面， 提供了一种接入点 AP, 包括：
接收模块， 用于接收第一 STA发送的该第一 STA和第二 STA之间的直 接链路通信的传输资源请求；
确定模块， 用于根据该传输资源请求确定该直接链路通信的传输资源， 并且确定该直接链路通信的发送功率以及第三 STA 的发送功率， 其中， 该 第三 STA 的传输资源与该直接链路通信的传输资源重叠， 该直接链路通信 的发送功率和该第三 STA的发送功率使该直接链路通信和该第三 STA的传 输相互之间的干扰低于预定值；
发送模块， 用于向该第一 STA和该第二 STA发送第一调度信息， 该第 一调度信息指示该直接链路通信的传输资源和该直接链路通信的发送功率， 并向该第三 STA发送第二调度信息， 该第二调度信息指示该第三 STA的发 送功率和该第三 STA的传输资源， 以使该第一 STA和该第二 STA根据该第 一调度信息进行直接链路通信， 该第三 STA根据该第二调度信息发送数据。
结合第三方面， 在第一种可能的实现方式中， 该接收模块还用于接收该 第一 STA、该第二 STA和该第三 STA中的每个 STA发送的该每个 STA的位 置信息，接收该第一 STA发送的该第一 STA的本地噪声功率以及该第一 STA 和该第二 STA之间的链路信息， 接收该第二 STA发送的该第二 STA的本地 噪声功率；
该确定模块还用于确定该 AP的本地噪声功率，根据该每个 STA在关联 过程中发送的关联帧， 确定该 AP与该每个 STA之间的链路信息；
该确定模块具体用于根据该第一 STA和该第二 STA之间的链路信息、 该 AP与该每个 STA之间的链路信息、该每个 STA的位置信息、该 AP的本 地噪声功率、该第一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该直接链路通信的发送功率以及第三 STA的发送功率。
结合第三方面的第一种可能的实现方式， 在第二种可能的实现方式中， 该确定模块具体用于根据该第一 STA和该第二 STA之间的链路信息、 该第 一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该直接链路 通信的发送功率， 根据该直接链路通信的发送功率、 该第一 STA和该第二 STA之间的链路信息、 该 AP与该每个 STA之间的链路信息、 该每个 STA 的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率以及该第 二 STA的本地噪声功率， 确定该第三 STA的发送功率。
结合第三方面的第一种可能的实现方式， 在第三种可能的实现方式中， 该确定模块具体用于根据该 AP与该第三 STA之间的链路信息、 该 AP的本 地噪声功率， 确定该第三 STA的发送功率， 根据该第三 STA的发送功率、 该第一 STA和该第二 STA之间的链路信息、 该 AP与该每个 STA之间的链 路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的 本地噪声功率以及该第二 STA 的本地噪声功率， 确定该直接链路通信的发 送功率。
结合第三方面的第一至三种可能的实现方式中的任一种可能的实现方 式， 在第四种可能的实现方式中， 该确定模块具体用于根据该关联帧确定该 关联帧的接收信号功率， 根据该关联帧的接收信号功率和该 AP的本地噪声 功率确定该关联帧的接收信号强度，根据该关联帧的额定发送功率和该关联 帧的接收信号强度确定该 AP与该每个 STA之间的链路信息。
第四方面， 提供了一种站点 STA, 包括：
发送模块， 用于向 AP发送该 STA和第二 STA之间的直接链路通信的 传输资源请求；
接收模块， 用于接收该 AP发送的第一调度信息， 该第一调度信息指示 该直接链路通信的传输资源和该直接链路通信的发送功率， 其中， 该直接链 路通信的发送功率和第三 STA的发送功率由该 AP确定， 该第三 STA的传 输资源与该直接链路通信的传输资源重叠， 该直接链路通信的发送功率和该 第三 STA的发送功率使该直接链路通信和该第三 STA的传输相互之间的干 扰低于预定值；
操作模块， 用于在该直接链路通信的传输资源上使用该直接链路通信的 发送功率与该第二 STA进行直接链路通信。
结合第四方面， 在第一种可能的实现方式中， 该直接链路通信的发送功 率和该第三 STA的发送功率由该 AP根据该 STA和该第二 STA之间的链路 信息、 该 AP与该 STA、 该第二 STA和该第三 STA中的每个 STA之间的链 路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该 STA的本地 噪声功率以及该第二 STA的本地噪声功率确定；
该发送模块还用于向该 AP发送该 STA的位置信息，在关联过程中向该 AP发送关联帧以使该 AP确定该 AP与该 STA之间的链路信息， 以额定功 率向该第二 STA发送发现请求帧；
该接收模块还用于接收该第二 STA以额定功率发送的发现响应帧； 该 STA还包括：
确定模块， 用于确定该 STA 的本地噪声功率， 根据该发现响应帧确定 该 STA和该第二 STA之间的链路信息；
该发送模块还用于向该 AP发送该 STA的本地噪声功率以及该 STA和 该第二 STA之间的链路信息。
结合第四方面的第一种可能的实现方式， 在第二种可能的实现方式中， 该确定模块具体用于根据该发现响应帧确定该发现响应帧的接收信号功率， 根据该发现响应帧的接收信号功率和该 STA 的本地噪声功率确定该发现响 应帧的接收信号强度，根据该发现响应帧的额定发送功率和该发现响应帧的 接收信号强度确定该 STA和该第二 STA之间的链路信息。 基于上述技术方案， 本发明实施例通过确定第一 STA和第二 STA的直 接链路通信的发送功率和第三 STA 的发送功率， 使该直接链路通信和该第 三 STA的传输相互之间的干扰低于预定值， 可以使第一 STA和第二 STA的 直接链路通信与第三 STA的传输同时进行， 从而能够提升网络效率。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对本发明实施例中 所需要使用的附图作筒单地介绍， 显而易见地， 下面描述中的附图仅仅是本 发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的 前提下， 还可以根据这些附图获得其他的附图。
图 1是本发明实施例的一个应用场景的示意图。
图 2是根据本发明一个实施例的直接链路通信的方法的示意性流程图。 图 3是根据本发明另一实施例的直接链路通信的方法的示意性流程图。 图 4是根据本发明实施例的 AP的示意性框图。
图 5是根据本发明实施例的 STA的示意性框图。
图 6是根据本发明实施例的 AP的结构示意图。
图 7是根据本发明实施例的 STA的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例是本发明的一部分实施例， 而不 是全部实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作出创 造性劳动的前提下所获得的所有其他实施例， 都应属于本发明保护的范围。
图 1是本发明实施例的一个应用场景的示意图。 图 1中， STA 101、 STA 102和 STA 103都关联于 AP 100。 AP 100建立的基本服务集（ Basic Service Set, BSS )以调度的信道接入机制工作。 AP 100负责传输资源的调度和分配。 在整个 BSS中， 正常链路（ AP至 STA或者 STA至 AP )和直接链路 ( STA 至 STA )共存。 STA 101和 STA 102之间属于直接链路通信， STA 103和 AP 100之间属于正常链路通信。 在 STA 101和 STA 102之间的直接链路通信与 STA 103和 AP 100之间的正常链路通信的传输资源重叠的情况下，两路通信 可能会相互干扰。 应理解， 在本发明实施例中， 传输资源重叠表示传输资源完全相同或者 部分相同。
图 2示出了根据本发明实施例的直接链路通信的方法 200的示意性流程 图。 如图 2所示， 该方法 200包括：
S210, AP接收第一 STA发送的该第一 STA和第二 STA之间的直接链 路通信的传输资源请求；
S220, 该 AP根据该传输资源请求， 确定该直接链路通信的传输资源； S230 ,该 AP确定该直接链路通信的发送功率以及第三 STA的发送功率， 其中， 该第三 STA 的传输资源与该直接链路通信的传输资源重叠， 该直接 链路通信的发送功率和该第三 STA 的发送功率使该直接链路通信和该第三 STA的传输相互之间的干扰低于预定值；
S240, 该 AP向该第一 STA和该第二 STA发送第一调度信息， 该第一 调度信息指示该直接链路通信的传输资源和该直接链路通信的发送功率， 并 向该第三 STA发送第二调度信息， 该第二调度信息指示该第三 STA的发送 功率和该第三 STA的传输资源， 以使该第一 STA和该第二 STA根据该第一 调度信息进行直接链路通信， 该第三 STA根据该第二调度信息发送数据。
在本发明实施例中，该方法 200的执行主体 AP可以是图 1中的 AP 100, 第一 STA、 第二 STA和第三 STA可以分别是图 1中的 STA 101、 STA 102 和 STA 103。 应理解， 第三 STA的传输可以是第三 STA至 AP的传输， 也可 以是第三 STA与其他 STA (比如第四 STA ) 的直接链路通信， 本发明对此 并不限定。
第一 STA和第二 STA要进行直接链路通信时， 第一 STA (或第二 STA ) 向 AP发送该直接链路通信的传输资源请求， 向 AP申请传输资源。 AP接收 到该传输资源请求后， 为该直接链路通信分配传输资源。 为了同时调度第三 STA, AP—并确定该直接链路通信的发送功率以及第三 STA的发送功率， 以使该直接链路通信和该第三 STA 的传输相互之间的干扰低于预定值， 即 该直接链路通信对该第三 STA的传输的干扰低于预定值并且该第三 STA的 传输对该直接链路通信的干扰低于预定值。 然后， 该 AP向该第一 STA和该 第二 STA发送第一调度信息， 该第一调度信息指示该直接链路通信的传输 资源和该直接链路通信的发送功率， 向该第三 STA发送第二调度信息， 该 第二调度信息指示该第三 STA的发送功率和该第三 STA的传输资源。 该第 一 STA和该第二 STA根据该第一调度信息进行直接链路通信，即该第一 STA 和该第二 STA在该第一调度信息指示的直接链路通信的传输资源上使用该 第一调度信息指示的直接链路通信的发送功率进行通信。 第三 STA根据该 第二调度信息发送数据， 即该第三 STA在该第二调度信息指示的第三 STA 的传输资源上使用该第二调度信息指示的第三 STA 的发送功率发送数据。 由于 AP确定的该直接链路通信的发送功率和该第三 STA的发送功率使该直 接链路通信和该第三 STA 的传输相互之间的干扰低于预定值， 因此， 第一 STA和第二 STA的直接链路通信能够与第三 STA的传输同时进行， 从而提 升了网络效率。
因此， 本发明实施例的直接链路通信的方法， 通过确定第一 STA和第 二 STA的直接链路通信的发送功率和第三 STA的发送功率， 使该直接链路 通信和该第三 STA的传输相互之间的干扰低于预定值， 可以使第一 STA和 第二 STA的直接链路通信与第三 STA的传输同时进行， 从而能够提升网络 效率。
在本发明实施例中， 可选地， AP可以根据每个 STA的位置信息确定该 直接链路通信的发送功率以及第三 STA的发送功率。
在本发明实施例中， 可选地， AP确定该直接链路通信的发送功率以及 第三 STA的发送功率， 包括：
该 AP根据该第一 STA和该第二 STA之间的链路信息、该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该 第一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该直接链 路通信的发送功率以及第三 STA的发送功率。
在这种情况下， AP要先获取该第一 STA和该第二 STA之间的链路信息、 该 AP与该每个 STA之间的链路信息、该每个 STA的位置信息、该 AP的本 地噪声功率、该第一 STA的本地噪声功率以及该第二 STA的本地噪声功率。
因此， 可选地， 在该 AP确定该直接链路通信的发送功率以及第三 STA 的发送功率之前， 该方法 200还包括：
该 AP确定该 AP的本地噪声功率；
该 AP接收该第一 STA、 该第二 STA和该第三 STA中的每个 STA发送 的该每个 STA的位置信息；
该 AP根据该每个 STA在关联过程中发送的关联帧， 确定该 AP与该每 个 STA之间的链路信息；
该 AP接收该第一 STA发送的该第一 STA的本地噪声功率以及该第一 STA和该第二 STA之间的链路信息，接收该第二 STA发送的该第二 STA的 本地噪声功率。
AP首先估计 AP的本地噪声功率。 例如， AP可以通过计算平均噪声功 率 ( average noise power indicator, ANPI )来估计本地噪声功率。 ANPI的估 计方法与现行标准中的计算方法相同。
每个 STA在关联过程中， 将自己的位置信息上报给 AP。 应理解， STA 也可以在其他时间上报自己的位置信息， 本发明对此不限定。
每个 STA在关联到 AP时， AP根据每个 STA发送的关联帧估计每个 STA 与 AP之间的链路信息， 例如衰落信息。
可选地， 该 AP根据该每个 STA在关联过程中发送的关联帧， 确定该 AP与该每个 STA之间的链路信息， 包括：
该 AP根据该关联帧， 确定该关联帧的接收信号功率；
该 AP根据该关联帧的接收信号功率和该 AP的本地噪声功率， 确定该 关联帧的接收信号强度；
该 AP根据该关联帧的额定发送功率和该关联帧的接收信号强度， 确定 该 AP与该每个 STA之间的链路信息。
例如， AP 通过 STA 与其交互的关联帧估计接收信号功率 （received channel power indicator, RCPI )。 RCPI的估计方法也与现行标准中的计算方 法相同。 AP通过将 RCPI减去 ANPI获得接收信号强度。 由于关联帧的交互 是以额定功率发送的， 因此由该额定功率减去接收信号强度可以得到 AP与 STA之间的链路信息。
每个 STA估计自己的本地噪声功率， 并保存。 例如， STA也可以通过 计算 ANPI来估计本地噪声功率。
每个 STA 需要对每一个能接收到的帧解调媒体接入控制 （Medium Access Control, MAC ) 帧头， 以确定该帧是否发送给自己。 STA根据这些 信息确定自己能听到的 STA, 并记录这些 STA。 例如， 第一 STA能够听到 第二 STA的信息， 发现第二 STA处于自己的邻近区域。 当第一 STA与第二 STA之间有业务时， 第一 STA首先判断第二 STA是否处于自己的邻近区域 的 STA列表里。 如果不在， 则放弃建立直接链路， 转而通过正常链路通信。 如果在列表里， 则向第二 STA 以额定功率发送发现请求帧， 例如， 设备到 设备 ( Device to Device, D2D ) Discovery Request帧。 第二 STA以额定功率 回复发现响应帧， 例如， D2D Discovery Response帧。 第一 STA和第二 STA 才艮据 D2D Discovery Request帧和 D2D Discovery Response帧的交互估计两者 之间的链路信息， 如衰落信息。 第一 STA和第二 STA建立直接链路通信关 系， 并将本地保存的噪声功率和两者之间的链路信息上报给 AP, 其中， 第 一 STA和第二 STA之间的链路信息可以由第一 STA和第二 STA中的任意一 个发送给 AP。
第一 STA和第二 STA要进行直接链路通信时，第一 STA (或第二 STA ) 向 AP发送该直接链路通信的传输资源请求， 向 AP申请传输资源。 AP接收 到该传输资源请求后， 为该直接链路通信分配传输资源。 同时， AP选择第 三 STA, 例如， 选择离第一 STA和第二 STA较远的 STA。 AP为第三 STA 分配与该直接链路通信的传输资源重叠的传输资源。 为了同时调度传输资源 与该直接链路通信的传输资源重叠的第三 STA, AP一并确定该直接链路通 信的发送功率以及第三 STA的发送功率。 具体地， AP根据之前获得的该第 一 STA和该第二 STA之间的链路信息、 该 AP与该每个 STA之间的链路信 息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地 噪声功率以及该第二 STA 的本地噪声功率， 确定该直接链路通信的发送功 率以及第三 STA的发送功率， 使该直接链路通信和该第三 STA的传输相互 之间的干扰低于预定值。
例如， 假设第三 STA的传输为第三 STA与 AP的正常链路通信， 参考 图 1 , STA 101和 STA 102之间的直接链路通信对 STA 103与 AP 100的传输 的干扰为 STA 101和 STA 102以直接链路通信的功率发送数据时对 AP 100 接收 STA 103发送的数据和 STA 103接收 AP 100发送的数据的干扰， 可以 用直接链路通信的功率， STA 103的发送功率， AP与每个 STA之间的链路 信息、 AP的本地噪声功率表示出； STA 103与 AP 100的传输对 STA 101和 STA 102之间的直接链路通信的干扰为 STA 103向 AP 100发送数据和 AP 100 向 STA 103发送数据时对 STA 101接收 STA 102的数据以及 STA 102接收 STA 101的数据的干扰， 可以用直接链路通信的功率， STA 103的发送功率， STA 101和 STA 102之间的链路信息， STA 103和 STA 101之间的链路信息， STA 103和 STA 101之间的链路信息， STA 101的本地噪声功率以及 STA 102 的本地噪声功率表示出， 其中， STA 103和 STA 101之间的链路信息， 以及 STA 103和 STA 101之间的链路信息可以由 AP与每个 STA之间的链路信息 和每个 STA的位置信息计算得到。
AP在直接链路通信和第三 STA的传输相互之间的干扰低于预定值的条 件下确定出直接链路通信的发送功率和第三 STA的发送功率。 AP可以先确 定直接链路通信的发送功率再确定第三 STA 的发送功率， 也可以先确定第 三 STA的发送功率再确定直接链路通信的发送功率。
可选地， 在本发明的一个实施例中， AP确定该直接链路通信的发送功 率以及第三 STA的发送功率， 包括：
该 AP根据该第一 STA和该第二 STA之间的链路信息、 该第一 STA的 本地噪声功率以及该第二 STA 的本地噪声功率， 确定该直接链路通信的发 送功率；
该 AP根据该直接链路通信的发送功率、 该第一 STA和该第二 STA之 间的链路信息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置 信息、该 AP的本地噪声功率、该第一 STA的本地噪声功率以及该第二 STA 的本地噪声功率， 确定该第三 STA的发送功率。
在本实施例中， AP先根据该第一 STA和该第二 STA之间的链路信息、 该第一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该直接 链路通信的发送功率， 再在直接链路通信和第三 STA 的传输相互之间的干 扰低于预定值的条件下， 根据该直接链路通信的发送功率、 该第一 STA和 该第二 STA之间的链路信息、 该 AP与该每个 STA之间的链路信息、 该每 个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率 以及该第二 STA的本地噪声功率， 确定该第三 STA的发送功率。
可选地， 在本发明的另一个实施例中， AP确定该直接链路通信的发送 功率以及第三 STA的发送功率， 包括：
该 AP根据该 AP与该第三 STA之间的链路信息、 该 AP的本地噪声功 率， 确定该第三 STA的发送功率；
该 AP根据该第三 STA的发送功率、 该第一 STA和该第二 STA之间的 链路信息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本 地噪声功率， 确定该直接链路通信的发送功率。 在本实施例中， AP先根据该 AP与该第三 STA之间的链路信息、 该 AP 的本地噪声功率， 确定该第三 STA 的发送功率， 再在直接链路通信和第三 STA的传输相互之间的干扰低于预定值的条件下， 根据该第三 STA的发送 功率、 该第一 STA和该第二 STA之间的链路信息、 该 AP与该每个 STA之 间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该直接链路通 信的发送功率。
可选地， 第一 STA和第二 STA也可以自行确定直接链路通信的发送功 率， 并发送给 AP; AP根据该直接链路通信的发送功率选择第三 STA并确 定第三 STA的发送功率。 在这种情况下， 若 AP确定该直接链路通信的发送 功率合适， 则可以只在向第一 STA和第二 STA发送的调度信息中指示传输 资源； 若 AP确定该直接链路通信的发送功率不合适， 则可以重新确定直接 链路通信的发送功率， 并在向第一 STA和第二 STA发送的调度信息中指示 传输资源和重新确定的直接链路通信的发送功率。
本发明实施例的直接链路通信的方法， 通过确定第一 STA和第二 STA 的直接链路通信的发送功率和第三 STA 的发送功率， 使该直接链路通信和 该第三 STA的传输相互之间的干扰低于预定值，可以使第一 STA和第二 STA 的直接链路通信与第三 STA的传输同时进行， 因此可以充分利用频谱资源， 从而能够提升网络效率。
以上从 AP的角度详细描述了本发明实施例的直接链路通信的方法， 下 面从第一 STA的角度详细描述本发明实施例的直接链路通信的方法。
图 3示出了根据本发明实施例的直接链路通信的方法 300的示意性流程 图。 如图 3所示， 该方法 300包括：
S310, 第一 STA向 AP发送该第一 STA和第二 STA之间的直接链路通 信的传输资源请求；
S320, 该第一 STA接收该 AP发送的第一调度信息， 该第一调度信息指 示该直接链路通信的传输资源和该直接链路通信的发送功率， 其中， 该直接 链路通信的发送功率和第三 STA的发送功率由该 AP确定， 该第三 STA的 传输资源与该直接链路通信的传输资源重叠， 该直接链路通信的发送功率和 该第三 STA的发送功率使该直接链路通信和该第三 STA的传输相互之间的 干扰低于预定值； S330, 该第一 STA在该直接链路通信的传输资源上使用该直接链路通 信的发送功率与该第二 STA进行直接链路通信。
在本发明实施例中， 该方法 300的执行主体第一 STA可以是图 1 中的 STA 101或 STA 102, 相应地， 第二 STA可以是 STA 102或 STA 101 ; 第三 STA可以是图 1中的 STA 103; AP可以是图 1中的 AP 100。
第一 STA和第二 STA要进行直接链路通信时， 第一 STA向 AP发送该 直接链路通信的传输资源请求， 向 AP 申请传输资源。 AP接收到该传输资 源请求后， 为该直接链路通信分配传输资源。 同时， AP选择第三 STA, 例 如， 选择离第一 STA和第二 STA较远的 STA。 AP为第三 STA分配与该直 接链路通信的传输资源重叠的传输资源。 为了同时调度第三 STA, AP—并 确定该直接链路通信的发送功率以及第三 STA 的发送功率， 以使该直接链 路通信和该第三 STA 的传输相互之间的干扰低于预定值， 即该直接链路通 信对该第三 STA的传输的干扰低于预定值并且该第三 STA的传输对该直接 链路通信的干扰低于预定值。 该 AP向该第一 STA和该第二 STA发送第一 调度信息， 该第一调度信息指示该直接链路通信的传输资源和该直接链路通 信的发送功率， 向该第三 STA发送第二调度信息， 该第二调度信息指示该 第三 STA的发送功率和该第三 STA的传输资源。 该第一 STA接收该 AP发 送的第一调度信息，在该直接链路通信的传输资源上使用该直接链路通信的 发送功率与该第二 STA进行直接链路通信。由于 AP确定的该直接链路通信 的发送功率和该第三 STA的发送功率使该直接链路通信和该第三 STA的传 输相互之间的干扰低于预定值， 因此， 第一 STA和第二 STA的直接链路通 信能够与第三 STA的传输同时进行， 从而提升了网络效率。
因此， 本发明实施例的直接链路通信的方法， 通过使用 AP确定的使第 一 STA和第二 STA的直接链路通信和第三 STA的传输相互之间的干扰低于 预定值的直接链路通信的发送功率进行直接链路通信， 可以使第一 STA和 第二 STA的直接链路通信与第三 STA的传输同时进行， 从而能够提升网络 效率。
在本发明实施例中， 可选地， 该直接链路通信的发送功率和该第三 STA 的发送功率由该 AP根据该第一 STA和该第二 STA之间的链路信息、 该 AP 与该第一 STA、 该第二 STA和该第三 STA中的每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声 功率以及该第二 STA的本地噪声功率确定。
在这种情况下， 在该第一 STA向 AP发送该第一 STA和第二 STA之间 的直接链路通信的传输资源请求之前， 该方法 300还包括：
该第一 STA向该 AP发送该第一 STA的位置信息；
该第一 STA在关联过程中向该 AP发送关联帧， 以使该 AP确定该 AP 与该第一 STA之间的链路信息；
该第一 STA确定该第一 STA的本地噪声功率；
该第一 STA以额定功率向该第二 STA发送发现请求帧，接收该第二 STA 以额定功率发送的发现响应帧；
该第一 STA根据该发现响应帧， 确定该第一 STA和该第二 STA之间的 链路信息；
该第一 STA向该 AP发送该第一 STA的本地噪声功率以及该第一 STA 和该第二 STA之间的链路信息。
例如， 第一 STA在关联过程中， 将自己的位置信息上报给 AP。
第一 STA在关联到 AP时， AP根据第一 STA发送的关联帧估计第一 STA 与 AP之间的链路信息， 例如衰落信息。
第一 STA估计自己的本地噪声功率， 并保存。 例如， 第一 STA可以通 过计算 ANPI来估计本地噪声功率。
每个 STA需要对每一个能接收到的帧解调 MAC帧头，以确定该帧是否 发送给自己。 STA根据这些信息确定自己能听到的 STA, 并记录这些 STA。 例如， 第一 STA能够听到第二 STA的信息， 发现第二 STA处于自己的邻近 区域。 当第一 STA与第二 STA之间有业务时， 第一 STA首先判断第二 STA 是否处于自己的邻近区域的 STA列表里。 如果不在， 则放弃建立直接链路， 转而通过正常链路通信。 如果在列表里， 则向第二 STA 以额定功率发送发 现请求帧， 例如， D2D Discovery Request帧。 第二 STA以额定功率回复发 现响应帧， 例如， D2D Discovery Response帧。 第一 STA和第二 STA根据 D2D Discovery Request帧和 D2D Discovery Response帧的交互估计两者之间 的链路信息， 如衰落信息。
可选地，该第一 STA根据该发现响应帧，确定该第一 STA和该第二 STA 之间的链路信息， 包括：
该第一 STA根据该发现响应帧， 确定该发现响应帧的接收信号功率； 该第一 STA根据该发现响应帧的接收信号功率和该第一 STA的本地噪 声功率， 确定该发现响应帧的接收信号强度；
该第一 STA根据该发现响应帧的额定发送功率和该发现响应帧的接收 信号强度， 确定该第一 STA和该第二 STA之间的链路信息。
例如， 第一 STA通过发现响应帧估计 RCPI, 通过 RCPI减去 ANPI获 得接收信号强度。 由于发现请求帧和发现响应帧是以额定功率发送的， 因此 由该额定功率减去接收信号强度可以估计直接链路通信对之间的链路信息。
应理解， 对于第二 STA来说， 可以根据发现请求帧， 确定第一 STA和 第二 STA之间的链路信息。
第一 STA和第二 STA建立直接链路通信关系， 并将本地保存的噪声功 率和两者之间的链路信息上报给 AP, 其中， 第一 STA和第二 STA之间的链 路信息可以由第一 STA和第二 STA中的任意一个发送给 AP, 例如由第一 STA发送。
第一 STA和第二 STA要进行直接链路通信时， 第一 STA向 AP发送该 直接链路通信的传输资源请求， 向 AP 申请传输资源。 AP接收到该传输资 源请求后， 为该直接链路通信分配传输资源。 为了同时调度传输资源与该直 接链路通信的传输资源重叠的第三 STA, AP一并确定该直接链路通信的发 送功率以及第三 STA的发送功率。 具体地， AP根据之前获得的该第一 STA 和该第二 STA之间的链路信息、 该 AP与每个 STA之间的链路信息、 该每 个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率 以及该第二 STA 的本地噪声功率， 确定该直接链路通信的发送功率以及第 三 STA的发送功率， 使该直接链路通信和该第三 STA的传输相互之间的干 扰低于预定值。
例如， 假设第三 STA的传输为第三 STA与 AP的正常链路通信， 参考 图 1 , STA 101和 STA 102之间的直接链路通信对 STA 103与 AP 100的传输 的干扰为 STA 101和 STA 102以直接链路通信的功率发送数据时对 AP 100 接收 STA 103发送的数据和 STA 103接收 AP 100发送的数据的干扰， 可以 用直接链路通信的功率， STA 103的发送功率， AP与每个 STA之间的链路 信息、 AP的本地噪声功率表示出； STA 103与 AP 100的传输对 STA 101和 STA 102之间的直接链路通信的干扰为 STA 103向 AP 100发送数据和 AP 100 向 STA 103发送数据时对 STA 101接收 STA 102的数据以及 STA 102接收 STA 101的数据的干扰， 可以用直接链路通信的功率， STA 103的发送功率， STA 101和 STA 102之间的链路信息， STA 103和 STA 101之间的链路信息， STA 103和 STA 101之间的链路信息， STA 101的本地噪声功率以及 STA 102 的本地噪声功率表示出， 其中， STA 103和 STA 101之间的链路信息， 以及 STA 103和 STA 101之间的链路信息可以由 AP与每个 STA之间的链路信息 和每个 STA的位置信息计算得到。
AP在直接链路通信和第三 STA的传输相互之间的干扰低于预定值的条 件下确定出直接链路通信的发送功率和第三 STA的发送功率。 第一 STA使 用该直接链路通信的发送功率与第二 STA进行直接链路通信。
本发明实施例的直接链路通信的方法， 通过使用 AP确定的使第一 STA 和第二 STA的直接链路通信和第三 STA的传输相互之间的干扰低于预定值 的直接链路通信的发送功率进行直接链路通信，可以使第一 STA和第二 STA 的直接链路通信与第三 STA的传输同时进行， 因此可以充分利用频谱资源， 从而能够提升网络效率。
应理解， 在本发明实施例中， AP侧描述的 AP、 第一 STA、 第二 STA 和第三 STA相互之间的交互及相关特性、功能等与第一 STA侧的描述相应， 为了筒洁， 在此不再赘述。
应理解， 在本发明的各种实施例中， 上述各过程的序号的大小并不意味 着执行顺序的先后， 各过程的执行顺序应以其功能和内在逻辑确定， 而不应 对本发明实施例的实施过程构成任何限定。
上文中详细描述了根据本发明实施例的直接链路通信的方法， 下面将描 述根据本发明实施例的 AP和 STA。
图 4示出了根据本发明实施例的 AP 400的示意性框图。 如图 4所示， 该 AP 400包括：
接收模块 410, 用于接收第一站点 STA发送的该第一 STA和第二 STA 之间的直接链路通信的传输资源请求；
确定模块 420, 用于根据该传输资源请求确定该直接链路通信的传输资 源， 并且确定该直接链路通信的发送功率以及第三 STA的发送功率， 其中， 该第三 STA 的传输资源与该直接链路通信的传输资源重叠， 该直接链路通 信的发送功率和该第三 STA的发送功率使该直接链路通信和该第三 STA的 传输相互之间的干扰低于预定值； 发送模块 430, 用于向该第一 STA和该第二 STA发送第一调度信息， 该第一调度信息指示该直接链路通信的传输资源和该直接链路通信的发送 功率，并向该第三 STA发送第二调度信息，该第二调度信息指示该第三 STA 的发送功率和该第三 STA的传输资源， 以使该第一 STA和该第二 STA根据 该第一调度信息进行直接链路通信， 该第三 STA根据该第二调度信息发送 数据。
本发明实施例的 AP,通过确定第一 STA和第二 STA的直接链路通信的 发送功率和第三 STA的发送功率， 使该直接链路通信和该第三 STA的传输 相互之间的干扰低于预定值， 可以使第一 STA和第二 STA的直接链路通信 与第三 STA的传输同时进行， 从而能够提升网络效率。
在本发明实施例中， 可选地， 该接收模块 410还用于接收该第一 STA、 该第二 STA和该第三 STA中的每个 STA发送的该每个 STA的位置信息，接 收该第一 STA发送的该第一 STA的本地噪声功率以及该第一 STA和该第二 STA之间的链路信息，接收该第二 STA发送的该第二 STA的本地噪声功率； 该确定模块 420还用于确定该 AP的本地噪声功率，根据该每个 STA在 关联过程中发送的关联帧， 确定该 AP与该每个 STA之间的链路信息；
该确定模块 420具体用于根据该第一 STA和该第二 STA之间的链路信 息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP 的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本地噪声 功率， 确定该直接链路通信的发送功率以及第三 STA的发送功率。
在本发明实施例中， 可选地， 该确定模块 420具体用于根据该第一 STA 和该第二 STA之间的链路信息、该第一 STA的本地噪声功率以及该第二 STA 的本地噪声功率， 确定该直接链路通信的发送功率， 根据该直接链路通信的 发送功率、该第一 STA和该第二 STA之间的链路信息、该 AP与该每个 STA 之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该第三 STA的 发送功率。
在本发明实施例中， 可选地， 该确定模块 420具体用于根据该 AP与该 第三 STA之间的链路信息、 该 AP的本地噪声功率， 确定该第三 STA的发 送功率， 根据该第三 STA的发送功率、 该第一 STA和该第二 STA之间的链 路信息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本 地噪声功率， 确定该直接链路通信的发送功率。
在本发明实施例中， 可选地， 该确定模块 420具体用于根据该关联帧确 定该关联帧的接收信号功率， 根据该关联帧的接收信号功率和该 AP的本地 噪声功率确定该关联帧的接收信号强度，根据该关联帧的额定发送功率和该 关联帧的接收信号强度确定该 AP与该每个 STA之间的链路信息。
根据本发明实施例的 AP 400可对应于根据本发明实施例的直接链路通 信的方法中的 AP,并且 AP 400中的各个模块的上述和其它操作和 /或功能分 别为了实现前述各个方法的相应流程， 为了筒洁， 在此不再赘述。
本发明实施例的 AP,通过确定第一 STA和第二 STA的直接链路通信的 发送功率和第三 STA的发送功率， 使该直接链路通信和该第三 STA的传输 相互之间的干扰低于预定值， 可以使第一 STA和第二 STA的直接链路通信 与第三 STA 的传输同时进行， 因此可以充分利用频谱资源， 从而能够提升 网络效率。
图 5示出了根据本发明实施例的 STA 500的示意性框图。 如图 5所示， 该 STA 500包括：
发送模块 510,用于向接入点 AP发送该 STA和第二 STA之间的直接链 路通信的传输资源请求；
接收模块 520, 用于接收该 AP发送的第一调度信息， 该第一调度信息 指示该直接链路通信的传输资源和该直接链路通信的发送功率， 其中， 该直 接链路通信的发送功率和第三 STA的发送功率由该 AP确定， 该第三 STA 的传输资源与该直接链路通信的传输资源重叠， 该直接链路通信的发送功率 和该第三 STA的发送功率使该直接链路通信和该第三 STA的传输相互之间 的干扰低于预定值；
操作模块 530, 用于在该直接链路通信的传输资源上使用该直接链路通 信的发送功率与该第二 STA进行直接链路通信。
本发明实施例的 STA, 通过使用 AP确定的使该 STA和第二 STA的直 接链路通信和第三 STA 的传输相互之间的干扰低于预定值的直接链路通信 的发送功率进行直接链路通信， 可以使该 STA和第二 STA的直接链路通信 与第三 STA的传输同时进行， 从而能够提升网络效率。
在本发明实施例中， 可选地， 该直接链路通信的发送功率和该第三 STA 的发送功率由该 AP根据该 STA和该第二 STA之间的链路信息、该 AP与该 STA、该第二 STA和该第三 STA中的每个 STA之间的链路信息、该每个 STA 的位置信息、 该 AP的本地噪声功率、 该 STA的本地噪声功率以及该第二 STA的本地噪声功率确定；
该发送模块 510还用于向该 AP发送该 STA的位置信息，在关联过程中 向该 AP发送关联帧以使该 AP确定该 AP与该 STA之间的链路信息， 以额 定功率向该第二 STA发送发现请求帧；
该接收模块 520还用于接收该第二 STA以额定功率发送的发现响应帧； 该 STA 500还包括：
确定模块， 用于确定该 STA 的本地噪声功率， 根据该发现响应帧确定 该 STA和该第二 STA之间的链路信息；
该发送模块 510还用于向该 AP发送该 STA的本地噪声功率以及该 STA 和该第二 STA之间的链路信息。
在本发明实施例中， 可选地， 该确定模块具体用于根据该发现响应帧确 定该发现响应帧的接收信号功率， 根据该发现响应帧的接收信号功率和该 STA的本地噪声功率确定该发现响应帧的接收信号强度，根据该发现响应帧 的额定发送功率和该发现响应帧的接收信号强度确定该 STA和该第二 STA 之间的链路信息。 信的方法中的第一 STA, 并且 STA 500中的各个模块的上述和其它操作和 / 或功能分别为了实现前述各个方法的相应流程， 为了筒洁， 在此不再赘述。
本发明实施例的 STA, 通过使用 AP确定的使该 STA和第二 STA的直 接链路通信和第三 STA 的传输相互之间的干扰低于预定值的直接链路通信 的发送功率进行直接链路通信， 可以使该 STA和第二 STA的直接链路通信 与第三 STA 的传输同时进行， 因此可以充分利用频谱资源， 从而能够提升 网络效率。
图 6示出了本发明的又一实施例提供的 AP的结构， 包括至少一个处理 器 602 (例如 CPU ),至少一个网络接口 605或者其他通信接口，存储器 606, 和至少一个通信总线 603 , 用于实现这些部件之间的连接通信。 处理器 602 用于执行存储器 606中存储的可执行模块， 例如计算机程序。 存储器 606可 能包含高速随机存取存储器（RAM: Random Access Memory ), 也可能还包 括非不稳定的存储器（non-volatile memory ), 例如至少一个磁盘存储器。 通 过至少一个网络接口 605 (可以是有线或者无线） 实现与至少一个其他网元 之间的通信连接。
在一些实施方式中，存储器 606存储了程序 6061 ,处理器 602执行程序 6061 , 用于执行以下操作：
通过网络接口 605接收第一 STA发送的该第一 STA和第二 STA之间的 直接链路通信的传输资源请求；
根据该传输资源请求， 确定该直接链路通信的传输资源；
确定该直接链路通信的发送功率以及第三 STA 的发送功率， 其中， 该 第三 STA 的传输资源与该直接链路通信的传输资源重叠， 该直接链路通信 的发送功率和该第三 STA的发送功率使该直接链路通信和该第三 STA的传 输相互之间的干扰低于预定值；
通过网络接口 605向该第一 STA和该第二 STA发送第一调度信息， 该 第一调度信息指示该直接链路通信的传输资源和该直接链路通信的发送功 率， 并向该第三 STA发送第二调度信息， 该第二调度信息指示该第三 STA 的发送功率和该第三 STA的传输资源， 以使该第一 STA和该第二 STA根据 该第一调度信息进行直接链路通信， 该第三 STA根据该第二调度信息发送 数据。
可选地， 处理器 602还用于，
确定该 AP的本地噪声功率；
通过网络接口 605接收该第一 STA、 该第二 STA和该第三 STA中的每 个 STA发送的该每个 STA的位置信息；
根据该每个 STA在关联过程中发送的关联帧，确定该 AP与该每个 STA 之间的链路信息；
通过网络接口 605接收该第一 STA发送的该第一 STA的本地噪声功率 以及该第一 STA和该第二 STA之间的链路信息， 接收该第二 STA发送的该 第二 STA的本地噪声功率；
处理器 602具体用于根据该第一 STA和该第二 STA之间的链路信息、 该 AP与该每个 STA之间的链路信息、该每个 STA的位置信息、该 AP的本 地噪声功率、该第一 STA的本地噪声功率以及该第二 STA的本地噪声功率， 确定该直接链路通信的发送功率以及第三 STA的发送功率。 可选地， 处理器 602具体用于，
根据该第一 STA和该第二 STA之间的链路信息、 该第一 STA的本地噪 声功率以及该第二 STA的本地噪声功率， 确定该直接链路通信的发送功率； 根据该直接链路通信的发送功率、 该第一 STA和该第二 STA之间的链 路信息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本 地噪声功率， 确定该第三 STA的发送功率。
可选地， 处理器 602具体用于，
根据该 AP与该第三 STA之间的链路信息、 该 AP的本地噪声功率， 确 定该第三 STA的发送功率；
根据该第三 STA的发送功率、 该第一 STA和该第二 STA之间的链路信 息、 该 AP与该每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP 的本地噪声功率、 该第一 STA的本地噪声功率以及该第二 STA的本地噪声 功率， 确定该直接链路通信的发送功率。
可选地， 处理器 602具体用于，
根据该关联帧， 确定该关联帧的接收信号功率；
根据该关联帧的接收信号功率和该 AP的本地噪声功率， 确定该关联帧 的接收信号强度；
根据该关联帧的额定发送功率和该关联帧的接收信号强度， 确定该 AP 与该每个 STA之间的链路信息。
从本发明实施例提供的以上技术方案可以看出，本发明实施例通过确定 第一 STA和第二 STA的直接链路通信的发送功率和第三 STA的发送功率， 使该直接链路通信和该第三 STA 的传输相互之间的干扰低于预定值， 可以 使第一 STA和第二 STA的直接链路通信与第三 STA的传输同时进行， 从而 能够提升网络效率。
图 7示出了本发明的又一实施例提供的 STA的结构， 包括至少一个处 理器 702 (例如 CPU ), 至少一个网络接口 705或者其他通信接口， 存储器 706, 和至少一个通信总线 703, 用于实现这些部件之间的连接通信。 处理器 702用于执行存储器 706中存储的可执行模块，例如计算机程序。存储器 706 可能包含高速随机存取存储器（RAM: Random Access Memory ), 也可能还 包括非不稳定的存储器（ non-volatile memory ), 例如至少一个磁盘存储器。 通过至少一个网络接口 705 (可以是有线或者无线） 实现与至少一个其他网 元之间的通信连接。
在一些实施方式中，存储器 706存储了程序 7061 ,处理器 702执行程序 7061 , 用于执行以下操作：
通过网络接口 705向 AP发送该 STA和第二 STA之间的直接链路通信 的传输资源请求；
通过网络接口 705接收该 AP发送的第一调度信息， 该第一调度信息指 示该直接链路通信的传输资源和该直接链路通信的发送功率， 其中， 该直接 链路通信的发送功率和第三 STA的发送功率由该 AP确定， 该第三 STA的 传输资源与该直接链路通信的传输资源重叠， 该直接链路通信的发送功率和 该第三 STA的发送功率使该直接链路通信和该第三 STA的传输相互之间的 干扰低于预定值；
在该直接链路通信的传输资源上使用该直接链路通信的发送功率与该 第二 STA进行直接链路通信。
可选地， 该直接链路通信的发送功率和该第三 STA的发送功率由该 AP 根据该 STA和该第二 STA之间的链路信息、 该 AP与该 STA、 该第二 STA 和该第三 STA中的每个 STA之间的链路信息、 该每个 STA的位置信息、 该 AP的本地噪声功率、该 STA的本地噪声功率以及该第二 STA的本地噪声功 率确定；
处理器 702还用于，
通过网络接口 705向该 AP发送该 STA的位置信息；
通过网络接口 705在关联过程中向该 AP发送关联帧， 以使该 AP确定 该 AP与该 STA之间的链路信息；
确定该 STA的本地噪声功率；
通过网络接口 705以额定功率向该第二 STA发送发现请求帧， 接收该 第二 STA以额定功率发送的发现响应帧；
根据该发现响应帧， 确定该 STA和该第二 STA之间的链路信息； 通过网络接口 705向该 AP发送该 STA的本地噪声功率以及该 STA和 该第二 STA之间的链路信息。
可选地， 处理器 702具体用于，
根据该发现响应帧， 确定该发现响应帧的接收信号功率； 根据该发现响应帧的接收信号功率和该 STA 的本地噪声功率， 确定该 发现响应帧的接收信号强度；
根据该发现响应帧的额定发送功率和该发现响应帧的接收信号强度，确 定该 STA和该第二 STA之间的链路信息。
从本发明实施例提供的以上技术方案可以看出，本发明实施例通过使用
AP确定的使第一 STA和第二 STA的直接链路通信和第三 STA的传输相互 之间的干扰低于预定值的直接链路通信的发送功率进行直接链路通信， 可以 使第一 STA和第二 STA的直接链路通信与第三 STA的传输同时进行， 从而 能够提升网络效率。
应理解， 在本发明实施例中， 术语 "和 /或"仅仅是一种描述关联对象的 关联关系， 表示可以存在三种关系。 例如， A和 /或 B, 可以表示： 单独存在 A, 同时存在 A和 B, 单独存在 B这三种情况。 另外， 本文中字符 "/" , 一 般表示前后关联对象是一种 "或" 的关系。
本领域普通技术人员可以意识到， 结合本文中所公开的实施例描述的各 示例的单元及算法步骤， 能够以电子硬件、 计算机软件或者二者的结合来实 现， 为了清楚地说明硬件和软件的可互换性， 在上述说明中已经按照功能一 般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执 行， 取决于技术方案的特定应用和设计约束条件。 专业技术人员可以对每个 特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超 出本发明的范围。
所属领域的技术人员可以清楚地了解到， 为了描述的方便和筒洁， 上述 描述的系统、 装置和单元的具体工作过程， 可以参考前述方法实施例中的对 应过程， 在此不再赘述。
在本申请所提供的几个实施例中， 应该理解到， 所揭露的系统、 装置和 方法， 可以通过其它的方式实现。 例如， 以上所描述的装置实施例仅仅是示 意性的， 例如， 所述单元的划分， 仅仅为一种逻辑功能划分， 实际实现时可 以有另外的划分方式， 例如多个单元或组件可以结合或者可以集成到另一个 系统， 或一些特征可以忽略， 或不执行。 另外， 所显示或讨论的相互之间的 耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或 通信连接， 也可以是电的， 机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作 为单元显示的部件可以是或者也可以不是物理单元， 即可以位于一个地方， 或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或 者全部单元来实现本发明实施例方案的目的。
另外， 在本发明各个实施例中的各功能单元可以集成在一个处理单元 中， 也可以是各个单元单独物理存在， 也可以是两个或两个以上单元集成在 一个单元中。 上述集成的单元既可以采用硬件的形式实现， 也可以采用软件 功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销 售或使用时， 可以存储在一个计算机可读取存储介质中。 基于这样的理解， 本发明的技术方案本质上或者说对现有技术做出贡献的部分， 或者该技术方 案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在 一个存储介质中， 包括若干指令用以使得一台计算机设备（可以是个人计算 机， 服务器， 或者网络设备等）执行本发明各个实施例所述方法的全部或部 分步骤。 而前述的存储介质包括： U盘、 移动硬盘、 只读存储器（ROM, Read-Only Memory )、 随机存取存储器（RAM, Random Access Memory ), 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到各种等效的修改或替换， 这些修改或替换都应涵盖在本发明的保护范围 之内。 因此， 本发明的保护范围应以权利要求的保护范围为准。

Claims

权利要求
1. 一种接入点 AP, 其特征在于， 包括：
接收模块， 用于接收第一站点 STA发送的所述第一 STA和第二 STA之 间的直接链路通信的传输资源请求；
确定模块， 用于根据所述传输资源请求确定所述直接链路通信的传输资 源， 并且确定所述直接链路通信的发送功率以及第三 STA 的发送功率， 其 中， 所述第三 STA 的传输资源与所述直接链路通信的传输资源重叠， 所述 直接链路通信的发送功率和所述第三 STA 的发送功率使所述直接链路通信 和所述第三 STA的传输相互之间的干扰低于预定值；
发送模块， 用于向所述第一 STA和所述第二 STA发送第一调度信息， 所述第一调度信息指示所述直接链路通信的传输资源和所述直接链路通信 的发送功率， 并向所述第三 STA发送第二调度信息， 所述第二调度信息指 示所述第三 STA的发送功率和所述第三 STA的传输资源，以使所述第一 STA 和所述第二 STA根据所述第一调度信息进行直接链路通信， 所述第三 STA 根据所述第二调度信息发送数据。
2. 根据权利要求 1所述的 AP, 其特征在于，
所述接收模块还用于接收所述第一 STA、所述第二 STA和所述第三 STA 中的每个 STA发送的所述每个 STA的位置信息， 接收所述第一 STA发送的 所述第一 STA的本地噪声功率以及所述第一 STA和所述第二 STA之间的链 路信息， 接收所述第二 STA发送的所述第二 STA的本地噪声功率；
所述确定模块还用于确定所述 AP的本地噪声功率， 根据所述每个 STA 在关联过程中发送的关联帧，确定所述 AP与所述每个 STA之间的链路信息； 所述确定模块具体用于根据所述第一 STA和所述第二 STA之间的链路 信息、 所述 AP与所述每个 STA之间的链路信息、 所述每个 STA的位置信 息、 所述 AP的本地噪声功率、 所述第一 STA的本地噪声功率以及所述第二 STA的本地噪声功率， 确定所述直接链路通信的发送功率以及第三 STA的 发送功率。
3. 根据权利要求 2所述的 AP, 其特征在于， 所述确定模块具体用于根 据所述第一 STA和所述第二 STA之间的链路信息、 所述第一 STA的本地噪 声功率以及所述第二 STA 的本地噪声功率， 确定所述直接链路通信的发送 功率， 根据所述直接链路通信的发送功率、 所述第一 STA和所述第二 STA 之间的链路信息、所述 AP与所述每个 STA之间的链路信息、所述每个 STA 的位置信息、 所述 AP的本地噪声功率、 所述第一 STA的本地噪声功率以及 所述第二 STA的本地噪声功率， 确定所述第三 STA的发送功率。
4. 根据权利要求 2所述的 AP, 其特征在于， 所述确定模块具体用于根 据所述 AP与所述第三 STA之间的链路信息、 所述 AP的本地噪声功率， 确 定所述第三 STA的发送功率，根据所述第三 STA的发送功率、所述第一 STA 和所述第二 STA之间的链路信息、 所述 AP与所述每个 STA之间的链路信 息、 所述每个 STA的位置信息、 所述 AP的本地噪声功率、 所述第一 STA 的本地噪声功率以及所述第二 STA 的本地噪声功率， 确定所述直接链路通 信的发送功率。
5. 根据权利要求 2至 4中任一项所述的 AP, 其特征在于， 所述确定模 块具体用于根据所述关联帧确定所述关联帧的接收信号功率，根据所述关联 帧的接收信号功率和所述 AP的本地噪声功率确定所述关联帧的接收信号强 度，根据所述关联帧的额定发送功率和所述关联帧的接收信号强度确定所述 AP与所述每个 STA之间的链路信息。
6. 一种站点 STA, 其特征在于， 包括：
发送模块， 用于向接入点 AP发送所述 STA和第二 STA之间的直接链 路通信的传输资源请求；
接收模块， 用于接收所述 AP发送的第一调度信息， 所述第一调度信息 指示所述直接链路通信的传输资源和所述直接链路通信的发送功率， 其中， 所述直接链路通信的发送功率和第三 STA的发送功率由所述 AP确定，所述 第三 STA 的传输资源与所述直接链路通信的传输资源重叠， 所述直接链路 通信的发送功率和所述第三 STA 的发送功率使所述直接链路通信和所述第 三 STA的传输相互之间的干扰低于预定值；
操作模块， 用于在所述直接链路通信的传输资源上使用所述直接链路通 信的发送功率与所述第二 STA进行直接链路通信。
7. 根据权利要求 6所述的 STA, 其特征在于， 所述直接链路通信的发 送功率和所述第三 STA的发送功率由所述 AP根据所述 STA和所述第二 STA 之间的链路信息、 所述 AP与所述 STA、 所述第二 STA和所述第三 STA中 的每个 STA之间的链路信息、 所述每个 STA的位置信息、 所述 AP的本地 噪声功率、 所述 STA的本地噪声功率以及所述第二 STA的本地噪声功率确 定；
所述发送模块还用于向所述 AP发送所述 STA的位置信息，在关联过程 中向所述 AP发送关联帧以使所述 AP确定所述 AP与所述 STA之间的链路 信息， 以额定功率向所述第二 STA发送发现请求帧；
所述接收模块还用于接收所述第二 STA以额定功率发送的发现响应帧； 所述 STA还包括：
确定模块， 用于确定所述 STA 的本地噪声功率， 根据所述发现响应帧 确定所述 STA和所述第二 STA之间的链路信息；
所述发送模块还用于向所述 AP发送所述 STA的本地噪声功率以及所述 STA和所述第二 STA之间的链路信息。
8. 根据权利要求 7所述的 STA, 其特征在于， 所述确定模块具体用于 根据所述发现响应帧确定所述发现响应帧的接收信号功率，根据所述发现响 应帧的接收信号功率和所述 STA 的本地噪声功率确定所述发现响应帧的接 收信号强度，根据所述发现响应帧的额定发送功率和所述发现响应帧的接收 信号强度确定所述 STA和所述第二 STA之间的链路信息。
9. 一种直接链路通信的方法， 其特征在于， 包括：
接入点 AP接收第一站点 STA发送的所述第一 STA和第二 STA之间的 直接链路通信的传输资源请求；
所述 AP根据所述传输资源请求， 确定所述直接链路通信的传输资源； 所述 AP确定所述直接链路通信的发送功率以及第三 STA的发送功率， 其中， 所述第三 STA 的传输资源与所述直接链路通信的传输资源重叠， 所 述直接链路通信的发送功率和所述第三 STA 的发送功率使所述直接链路通 信和所述第三 STA的传输相互之间的干扰低于预定值；
所述 AP向所述第一 STA和所述第二 STA发送第一调度信息， 所述第 一调度信息指示所述直接链路通信的传输资源和所述直接链路通信的发送 功率， 并向所述第三 STA发送第二调度信息， 所述第二调度信息指示所述 第三 STA的发送功率和所述第三 STA的传输资源， 以使所述第一 STA和所 述第二 STA根据所述第一调度信息进行直接链路通信， 所述第三 STA根据 所述第二调度信息发送数据。
10. 根据权利要求 9所述的方法， 其特征在于， 在所述 AP确定所述直 接链路通信的发送功率以及第三 STA的发送功率之前， 所述方法还包括： 所述 AP确定所述 AP的本地噪声功率；
所述 AP接收所述第一 STA、 所述第二 STA和所述第三 STA中的每个 STA发送的所述每个 STA的位置信息；
所述 AP根据所述每个 STA在关联过程中发送的关联帧， 确定所述 AP 与所述每个 STA之间的链路信息；
所述 AP接收所述第一 STA发送的所述第一 STA的本地噪声功率以及 所述第一 STA和所述第二 STA之间的链路信息， 接收所述第二 STA发送的 所述第二 STA的本地噪声功率；
所述 AP确定所述直接链路通信的发送功率以及第三 STA的发送功率， 包括：
所述 AP根据所述第一 STA和所述第二 STA之间的链路信息、 所述 AP 与所述每个 STA之间的链路信息、 所述每个 STA的位置信息、 所述 AP的 本地噪声功率、 所述第一 STA的本地噪声功率以及所述第二 STA的本地噪 声功率， 确定所述直接链路通信的发送功率以及第三 STA的发送功率。
11. 根据权利要求 10所述的方法， 其特征在于， 所述 AP确定所述直接 链路通信的发送功率以及第三 STA的发送功率， 包括：
所述 AP根据所述第一 STA和所述第二 STA之间的链路信息、 所述第 一 STA的本地噪声功率以及所述第二 STA的本地噪声功率， 确定所述直接 链路通信的发送功率；
所述 AP根据所述直接链路通信的发送功率、所述第一 STA和所述第二
STA之间的链路信息、所述 AP与所述每个 STA之间的链路信息、 所述每个 STA的位置信息、所述 AP的本地噪声功率、 所述第一 STA的本地噪声功率 以及所述第二 STA的本地噪声功率， 确定所述第三 STA的发送功率。
12. 根据权利要求 10所述的方法， 其特征在于， 所述 AP确定所述直接 链路通信的发送功率以及第三 STA的发送功率， 包括：
所述 AP根据所述 AP与所述第三 STA之间的链路信息、 所述 AP的本 地噪声功率， 确定所述第三 STA的发送功率；
所述 AP根据所述第三 STA的发送功率、所述第一 STA和所述第二 STA 之间的链路信息、所述 AP与所述每个 STA之间的链路信息、所述每个 STA 的位置信息、 所述 AP的本地噪声功率、 所述第一 STA的本地噪声功率以及 所述第二 STA的本地噪声功率， 确定所述直接链路通信的发送功率。
13. 根据权利要求 10至 12 中任一项所述的方法， 其特征在于， 所述 AP根据所述每个 STA在关联过程中发送的关联帧， 确定所述 AP与所述每 个 STA之间的链路信息， 包括：
所述 AP根据所述关联帧， 确定所述关联帧的接收信号功率；
所述 AP根据所述关联帧的接收信号功率和所述 AP的本地噪声功率， 确定所述关联帧的接收信号强度；
所述 AP根据所述关联帧的额定发送功率和所述关联帧的接收信号强 度， 确定所述 AP与所述每个 STA之间的链路信息。
14. 一种直接链路通信的方法， 其特征在于， 包括：
第一站点 STA向接入点 AP发送所述第一 STA和第二 STA之间的直接 链路通信的传输资源请求；
所述第一 STA接收所述 AP发送的第一调度信息，所述第一调度信息指 示所述直接链路通信的传输资源和所述直接链路通信的发送功率， 其中， 所 述直接链路通信的发送功率和第三 STA的发送功率由所述 AP确定，所述第 三 STA 的传输资源与所述直接链路通信的传输资源重叠， 所述直接链路通 信的发送功率和所述第三 STA 的发送功率使所述直接链路通信和所述第三 STA的传输相互之间的干扰低于预定值；
所述第一 STA在所述直接链路通信的传输资源上使用所述直接链路通 信的发送功率与所述第二 STA进行直接链路通信。
15. 根据权利要求 14所述的方法， 其特征在于， 所述直接链路通信的 发送功率和所述第三 STA的发送功率由所述 AP根据所述第一 STA和所述 第二 STA之间的链路信息、 所述 AP与所述第一 STA、 所述第二 STA和所 述第三 STA中的每个 STA之间的链路信息、 所述每个 STA的位置信息、 所 述 AP的本地噪声功率、 所述第一 STA的本地噪声功率以及所述第二 STA 的本地噪声功率确定；
在所述第一站点 STA向接入点 AP发送所述第一 STA和第二 STA之间 的直接链路通信的传输资源请求之前， 所述方法还包括：
所述第一 STA向所述 AP发送所述第一 STA的位置信息；
所述第一 STA在关联过程中向所述 AP发送关联帧， 以使所述 AP确定 所述 AP与所述第一 STA之间的链路信息；
所述第一 STA确定所述第一 STA的本地噪声功率； 所述第一 STA以额定功率向所述第二 STA发送发现请求帧， 接收所述 第二 STA以额定功率发送的发现响应帧；
所述第一 STA根据所述发现响应帧，确定所述第一 STA和所述第二 STA 之间的链路信息；
所述第一 STA向所述 AP发送所述第一 STA的本地噪声功率以及所述 第一 STA和所述第二 STA之间的链路信息。
16. 根据权利要求 15所述的方法， 其特征在于， 所述第一 STA根据所 述发现响应帧， 确定所述第一 STA和所述第二 STA之间的链路信息， 包括： 所述第一 STA根据所述发现响应帧， 确定所述发现响应帧的接收信号 功率；
所述第一 STA根据所述发现响应帧的接收信号功率和所述第一 STA的 本地噪声功率， 确定所述发现响应帧的接收信号强度；
所述第一 STA根据所述发现响应帧的额定发送功率和所述发现响应帧 的接收信号强度， 确定所述第一 STA和所述第二 STA之间的链路信息。
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