WO2015089808A1 - Procédé de sélection de point d'accès, terminal, et point d'accès - Google Patents

Procédé de sélection de point d'accès, terminal, et point d'accès Download PDF

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Publication number
WO2015089808A1
WO2015089808A1 PCT/CN2013/090013 CN2013090013W WO2015089808A1 WO 2015089808 A1 WO2015089808 A1 WO 2015089808A1 CN 2013090013 W CN2013090013 W CN 2013090013W WO 2015089808 A1 WO2015089808 A1 WO 2015089808A1
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WO
WIPO (PCT)
Prior art keywords
access point
data packet
terminal
sent
test data
Prior art date
Application number
PCT/CN2013/090013
Other languages
English (en)
Chinese (zh)
Inventor
杨讯
张佳胤
张连波
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 CN201380078769.9A priority Critical patent/CN105453651B/zh
Priority to PCT/CN2013/090013 priority patent/WO2015089808A1/fr
Publication of WO2015089808A1 publication Critical patent/WO2015089808A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/06—Access restriction performed under specific conditions based on traffic conditions

Definitions

  • Access point selection method terminal and access point
  • the present invention relates to the field of communications technologies, and in particular, to an access point selection method, a terminal, and an access point. Background technique
  • the prior art uses a multi-input and multi-output (MIM) technology to increase the data transmission rate. Since the number of antennas is different between the transmitting end and the receiving end, the station with more antennas can support the scenario of transmitting data simultaneously with multiple stations equipped with fewer antennas. Both the transmitting end and the receiving end can be called For the station. Sending a station with more antennas to multiple stations with fewer antennas is called downlink multi-user MIM0 (DL MU-MIM0), and multiple stations with fewer antennas are equipped at the same time.
  • DL MU-MIM0 downlink multi-user MIM0
  • the station transmission data of the number of antennas is called uplink multi-user MIMO (UL MU-MIM0).
  • UL MU-MIM0 uplink multi-user MIMO
  • the terminal is configured with fewer antennas, and the wireless access point (AP) is configured with more antennas.
  • MIM0 refers to a multi-path wireless channel on the transmitting end and the receiving end, that is, multi-antenna (or array antenna) and multi-channel.
  • the transmitting end is the terminal
  • the receiving end is the AP
  • the terminal communicates with the predetermined AP.
  • AP by utilizing spatial domain diversity (STBC, space-time coding) of spatially independent channels, frequency domain diversity (OF FFT, orthogonal frequency domain multiplexing) of independent channels in the frequency domain is utilized, and time domain independence is utilized.
  • STBC spatial domain diversity
  • OF FFT orthogonal frequency domain multiplexing
  • the signal strength can be enhanced by combining the repeated information, thereby improving the data transmission rate
  • the method of combining the repeated information is as follows: selective selective combining of the selection signals,
  • the equal-gain combination of simple summation and the maximum ratio combining using channel information weighting and re-adding can improve the data transmission efficiency of a single receiving end through different combining schemes.
  • the access point selection method, the terminal, and the access point provided by the present invention enable the terminal to select other high-quality APs when the predetermined AP to be connected to the terminal is unable to provide normal data transmission due to the saturation of the access amount, etc., thereby improving the terminal. Data transfer speed.
  • the present invention provides an access point selection method, where the method includes: sending a test data packet to at least one access point;
  • the access point is determined as the target access point.
  • the test data packet is an empty data packet.
  • the method After the receiving the response data packet sent by the multiple access points according to the test data packet, the method further includes:
  • a third possible implementation of the first aspect is also provided.
  • the method also includes:
  • a null packet advertisement is sent to the access point such that the access point indicated in the null packet advertisement is awaiting receipt of the null data packet.
  • the receiving, by the access point, the response data packet includes:
  • a fifth possible implementation of the first aspect is also provided.
  • Transmitting test data packets to at least one access point including:
  • the receiving, by the multiple access points, the response data packet sent by the test data packet includes: receiving an empty data packet sent by the part of the access point.
  • a sixth possible implementation manner of the first aspect is further provided, in a sixth possible implementation manner of the first aspect,
  • the empty data packet request carries a reply time
  • the receiving the response data packet sent by the multiple access points according to the test data packet includes: receiving the null data packet sent by the part of the access point according to the reply time.
  • a seventh possible implementation manner of the first aspect is further provided.
  • Sending a test data packet to at least one access point specifically including:
  • Receiving the response data packet sent by each of the at least one access point according to the test data packet including:
  • an eighth possible implementation of the first aspect is also provided, in the first aspect First And determining, by the response data packet, the target access point, including: calculating a channel state parameter of the access point that sends the null data packet according to each received null data packet;
  • the access point corresponding to the optimal channel state parameter is determined as the target access point.
  • the ninth possible implementation manner of the first aspect is further provided.
  • the method also includes:
  • the first possibility of the first aspect, the second possibility of the first aspect, the third possibility of the first aspect, the fourth possibility of the first aspect, the fifth possibility of the first aspect Possible, the sixth possibility of the first aspect, the seventh possibility of the first aspect, the eighth possibility of the first aspect, or the ninth possible implementation of the first aspect, the first aspect is also provided.
  • the channel state parameter is any one of the following parameters: signal strength, signal to noise ratio SNR, and channel matrix.
  • the present invention further provides an access point selection method, where the method includes: receiving, by an access point, a test data packet sent by a terminal;
  • the access point and the at least one remaining access point determine the access point of the received test data packet whose channel state parameter is greater than the first threshold as the target access point, and the remaining access points are the received terminal An access point of the transmitted test packet other than the access point;
  • the method further includes: the access point and the at least one remaining access point, the channel state parameter of the received test data packet is smaller than the first The access point whose threshold value is greater than the second threshold is determined as the relay access point; And if the access point is the relay access point, forwarding the data packet sent by the terminal to the target access point.
  • test data packet is an empty data packet.
  • a third possible implementation manner of the second aspect is also provided, in a third possible implementation manner of the second aspect
  • the method further includes:
  • a fourth possible implementation of the second aspect is also provided, in a fourth possible implementation of the second aspect.
  • the method further includes:
  • a fifth possible implementation of the second aspect is also provided, in a fifth possible implementation manner of the second aspect After the target access point sends the response data packet to the terminal, the method further includes:
  • a sixth possible implementation of the second aspect is also provided, in a sixth possible implementation manner of the second aspect
  • the access point receives the test data packet sent by the terminal, and further includes:
  • Receiving a null data packet request sent by the terminal, where the null data packet request carries a reply time; the sending the response data packet to the terminal according to the test data packet includes:
  • the second party is further provided
  • the sending the response data packet to the terminal according to the test data packet further includes:
  • an eighth possible implementation of the second aspect is also provided, in an eighth possible implementation manner of the second aspect After the receiving the non-empty data packet sent by the terminal, the method further includes:
  • the connection with the terminal is disconnected.
  • the ninth possible implementation manner of the second aspect is further provided.
  • the access point and the at least one remaining access point determine the access point of the received test packet whose channel state parameter is greater than the first threshold as the target access point, and specifically includes:
  • the access point of the received test packet whose channel state parameter is greater than the first threshold is determined as the target access point.
  • the tenth possible implementation manner of the second aspect is further provided.
  • the access point and the at least one remaining access point determine that the channel state parameter of the received test data packet is less than the first threshold value, and the access point that is greater than the second threshold value is determined as the relay access point.
  • the method includes: interacting with the at least one remaining access point to form a channel shape of the test data packet received by each other Determining, as the relay access point, that the channel state parameter of the received test data packet is smaller than the first threshold value and greater than the second threshold value, where the first threshold value is greater than the second threshold value .
  • the channel state parameter is any one of the following parameters: Intensity, signal-to-noise ratio SNR, channel matrix.
  • the present invention provides a terminal, where the terminal includes:
  • a sending unit configured to send a test data packet to the at least one access point
  • a receiving unit configured to receive a response data packet sent by the multiple access points according to the test data packet
  • a determining unit configured to: when the receiving unit receives the response data sent by the multiple access points according to the test data packet Determining, according to the channel state parameter of the response data packet or the receiving channel state parameter carried by the response data packet, the target access point;
  • the receiving unit is further configured to receive a response data packet sent by an access point
  • the determining unit is further configured to determine, when the receiving unit receives a response data packet sent by an access point, the access point as a target access point.
  • the sending unit configured to send the test data packet to the at least one access point, specifically includes:
  • the sending unit is configured to send a null data packet to at least one access point.
  • the sending unit is further configured to send an acknowledgment data packet to the target access point, where the acknowledgment data packet is used by the terminal to establish a connection relationship with the target access point.
  • a third possible implementation manner of the third aspect is further provided.
  • the sending unit is further configured to send a null packet advertisement to the access point, so that the access point indicated in the null packet advertisement waits to receive the null data packet.
  • the fourth possible implementation manner of the foregoing third aspect The receiving unit is configured to receive a response packet sent by an access point, and specifically includes:
  • the receiving unit is configured to receive a beamforming report sent by the access point, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • a fifth possible implementation manner of the third aspect is further provided.
  • the sending unit is configured to send the test data packet to the at least one access point, specifically:
  • the sending unit is configured to send a null data packet request to a part of the at least one access point according to the preset sending list, where the preset sending list is used to record a part of the access points of the at least one access point. ;
  • the receiving unit is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and specifically includes:
  • the receiving unit is configured to receive an empty data packet sent by the part of the access point.
  • a sixth possible implementation manner of the foregoing third aspect is further provided, in a sixth possible implementation manner of the foregoing third aspect,
  • the empty data packet request carries a reply time
  • the receiving unit is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and specifically includes:
  • the receiving unit is configured to receive, according to the reply time, an empty data packet sent by the part of the access point.
  • the sending unit is configured to send the test data packet to the at least one access point, and further includes:
  • the sending unit is configured to send, by using a preset duration, an empty data packet request to an access point in an unsent state in the preset sending list;
  • the receiving unit is configured to use, by the multiple access points, the response data packet sent by the test data packet, and further includes:
  • the receiving unit is configured to receive the access point in an unsent state according to the null data An empty packet that the packet requests to send.
  • an eighth possible implementation of the third aspect is also provided, in the third aspect The eighth possible implementation manner, the determining unit, configured to determine, according to the channel state parameter of the response data packet or the received channel state parameter carried by the response data packet, the target access point, including: a determining unit, configured to calculate, according to each received null data packet, a channel state parameter of an access point that sends the null data packet;
  • the access point corresponding to the optimal channel state parameter is determined as the target access point.
  • the sending unit is further configured to send a handover notification to another access point, where the network address of the another access point is recorded in the handover notification, and the another access point is the at least one access An access point in the point that is not connected to the terminal;
  • the receiving unit is further configured to receive an acknowledgement character ACK sent by the another access point;
  • the determining unit is further configured to: when the receiving unit receives the acknowledgement character ACK sent by the another access point, determine that a connection has been established with the another access point.
  • the tenth possible implementation manner of the third aspect is further provided.
  • the channel state The parameters are any of the following parameters: signal strength, signal-to-noise ratio SNR, channel matrix.
  • a fourth aspect an access point, where the access point includes:
  • a receiving unit configured to receive a test data packet sent by the terminal
  • a determining unit configured to determine, by the at least one remaining access point, an access point that has a channel state parameter of the test data packet received by the receiving unit that is greater than the first threshold, as the target access point, and the remaining access points An access point other than the access point for receiving a test data packet sent by the terminal;
  • a sending unit configured to send a response data packet to the terminal when the determining unit obtains the access point as the target access point.
  • the determining unit is further configured to: Determining, by the at least one remaining access point, that the channel state parameter of the received test data packet is less than the first threshold value, and the access point that is greater than the second threshold value is determined as the relay access point;
  • the sending unit is further configured to: when the determining unit obtains the access point as the relay access point, forward the data packet sent by the terminal to the target access point.
  • the receiving unit configured to receive a test data packet sent by the terminal, specifically includes:
  • the receiving unit is configured to receive an empty data packet sent by the terminal.
  • a third possible implementation manner of the fourth aspect is further provided, in a third possible implementation manner of the fourth aspect, The receiving unit is further configured to: receive an acknowledgment data packet sent by the terminal, where the acknowledgment data packet is used to establish a connection relationship with the terminal.
  • the fourth possible implementation manner of the fourth aspect is further provided, in a fourth possible implementation manner of the fourth aspect, The receiving unit is further configured to: receive an empty data packet advertisement sent by the terminal;
  • the sending unit is further configured to send a beamforming report to the terminal, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • the receiving unit is configured to receive a test data packet sent by the terminal, and further includes:
  • the receiving unit is configured to receive a null data packet request sent by the terminal, where the empty data packet request carries a reply time;
  • the sending unit is configured to send a response data packet to the terminal, including:
  • the sending unit is configured to send a null data packet to the terminal according to the reply time.
  • the fourth party is further provided
  • the receiving unit is configured to receive a test data packet sent by the terminal, and further includes:
  • the sending unit is configured to send a response data packet to the terminal, and further includes:
  • the sending unit is configured to directly send an empty data packet to the terminal according to the null data packet request.
  • an eighth possible implementation manner of the foregoing fourth aspect is further provided, in an eighth possible implementation manner of the fourth aspect, The receiving unit is further configured to: receive the sent handover notification;
  • connection unit configured to establish a connection with the terminal when the receiving unit receives the handover notification sent by the terminal, where the network address of the access point is recorded in the handover notification, and establishing a connection with the terminal Sending a confirmation character to the terminal;
  • the connecting unit is further configured to: when the network address recorded by the switching notification received by the receiving unit does not include the network address of the access point, disconnect the terminal.
  • the ninth possible implementation manner of the fourth aspect is further provided, in a ninth possible implementation manner of the fourth aspect,
  • the determining unit configured to determine, by the at least one remaining access point, the access point of the received test data packet whose channel state parameter is greater than the first threshold as the target access point, specifically:
  • the determining unit is configured to: interact with the at least one remaining access point to exchange channel state parameters of the test data packet received by each other;
  • the access point of the received test packet whose channel state parameter is greater than the first threshold is determined as the target access point.
  • the tenth possible implementation manner of the fourth aspect is further provided, in the tenth possible implementation manner of the fourth aspect,
  • the determining unit configured to determine, by the at least one remaining access point, that the channel state parameter of the received test data packet is less than the first threshold value, and the access point that is greater than the second threshold value is determined as a relay connection Entry points, including:
  • the determining unit is configured to interact with the at least one remaining access point to exchange channel state parameters of test packets received by each other;
  • the channel state parameter is any one of the following parameters: Intensity, signal-to-noise ratio SNR, channel matrix.
  • the present invention provides a terminal, where the terminal includes:
  • a transmitter configured to send a test data packet to at least one access point
  • a receiver configured to receive a response data packet sent by multiple access points according to the test data packet
  • a processor configured to: when the receiver receives response data sent by multiple access points according to the test data packet Determining, according to the channel state parameter of the response data packet or the receiving channel state parameter carried by the response data packet, the target access point;
  • the receiver is further configured to receive a response data packet sent by an access point
  • the processor is further configured to determine the access point as a target access point when the receiver receives a response data packet sent by an access point.
  • the sending is used to send the test data packet to the at least one access point, specifically:
  • the transmitter is configured to send a null data packet to at least one access point.
  • a second possible implementation manner of the foregoing fifth aspect is further provided.
  • the transmitter is further configured to send an acknowledgment data packet to the target access point, where the acknowledgment data packet is used by the terminal to establish a connection relationship with the target access point.
  • a third possible implementation manner of the fifth aspect is further provided.
  • the transmitter is further configured to send a null packet advertisement to the access point, so that the access point indicated in the null packet advertisement waits to receive the null data packet.
  • the receiver is configured to receive a response packet sent by an access point, and specifically includes:
  • the receiver is configured to receive a beamforming report sent by the access point, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • a fifth possible implementation manner of the foregoing fifth aspect is provided, in a fifth possible implementation manner of the foregoing fifth aspect,
  • the transmitter is configured to send a test data packet to the at least one access point, specifically:
  • the transmitter is configured to send a null data packet request to a part of the at least one access point according to the preset sending list, where the preset sending list is used to record a part of the access points of the at least one access point. ;
  • a receiver configured to receive a response packet sent by multiple access points according to the test data packet, specifically:
  • the receiver is configured to receive an empty data packet sent by the part of the access point.
  • a sixth possible implementation manner of the foregoing fifth aspect is further provided, in a sixth possible implementation manner of the foregoing fifth aspect,
  • the empty data packet request carries a reply time
  • a receiver configured to receive a response packet sent by multiple access points according to the test data packet, specifically:
  • the receiver is configured to receive, according to the reply time, an empty data packet sent by the part of the access point.
  • the sending unit configured to send the test data packet to the at least one access point, further includes:
  • the sending unit is configured to send, by using a preset duration, an empty data packet request to an access point in an unsent state in the preset sending list;
  • the receiving unit is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and further includes:
  • the receiving unit is configured to receive an empty data packet that is sent by the access point in the unsent state according to the null data packet request.
  • an eighth possible implementation of the fifth aspect is also provided, in the fifth aspect The eighth possible implementation manner, the processor, configured to determine a target access point according to a channel state parameter of the response data packet or a received channel state parameter carried by the response data packet, including: a processor, configured to calculate, according to each received null data packet, a channel state parameter of an access point that sends the null data packet;
  • the access point corresponding to the optimal channel state parameter is determined as the target access point.
  • the ninth possible implementation manner of the fifth aspect is further provided.
  • the transmitter is further configured to send a handover notification to another access point, where the network address of the another access point is recorded in the handover notification, and the another access point is the at least one access point An access point that is not connected to the terminal;
  • the receiver is further configured to receive an acknowledgement character ACK sent by the another access point;
  • the processor is further configured to determine that a connection has been established with the another access point when the receiver receives the acknowledgement character ACK sent by the another access point.
  • the first possibility, the second possibility, the third possibility, the fourth possibility, the fifth possibility, the sixth possibility, the seventh possibility, the eighth A possible or a ninth possible implementation manner, the tenth possible implementation manner of the fifth aspect is further provided.
  • the channel state The parameters are any of the following parameters: signal strength, signal-to-noise ratio SNR, channel matrix.
  • a receiver configured to receive a test data packet sent by the terminal
  • the processor configured to determine, by the at least one remaining access point, that the channel state parameter of the test data packet received by the receiver is greater than the first threshold, is the target access point, and the remaining access points An access point other than the access point for receiving a test data packet sent by the terminal;
  • a transmitter configured to send a response data packet to the terminal when the processor obtains the access point as the target access point.
  • the processor is further configured to: and the at least one remaining access point, the channel state parameter of the received test data packet is smaller than the first threshold And the access point greater than the second threshold is determined as the relay access point;
  • the transmitter is further configured to: when the processor obtains the access point as the relay access point, forward the data packet sent by the terminal to the target access point.
  • the receiver configured to receive a test data packet sent by the terminal, specifically includes:
  • the receiver is configured to receive an empty data packet sent by the terminal.
  • the receiver is further configured to: receive an acknowledgement data packet sent by the terminal, where the acknowledgement data packet is used to establish a connection relationship with the terminal.
  • the fourth possible implementation manner of the sixth aspect is further provided, in the fourth possible implementation manner of the sixth aspect, The receiver is further configured to: receive an empty data packet advertisement sent by the terminal;
  • the fifth possible implementation manner of the sixth aspect is further provided.
  • the transmitter is further configured to send a beamforming report to the terminal, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • the sixth possible implementation manner of the sixth aspect is further provided, in a sixth possible implementation manner of the sixth aspect,
  • the receiver is configured to receive a test data packet sent by the terminal, and further includes:
  • the receiver is configured to receive an empty data packet request sent by the terminal, where the empty data packet request carries a reply time;
  • the transmitter is configured to send a response packet to the terminal, including:
  • the transmitter is configured to send a null data packet to the terminal according to the reply time.
  • the seventh possible implementation manner of the sixth aspect is further provided, in the seventh possible implementation manner of the sixth aspect,
  • the receiver is configured to receive a test data packet sent by the terminal, and further includes:
  • the transmitter is configured to send a response data packet to the terminal, and further includes:
  • the transmitter is configured to send a null data packet directly to the terminal according to the null data packet request.
  • an eighth possible implementation manner of the foregoing sixth aspect is further provided, in an eighth possible implementation manner of the sixth aspect, The receiver is further configured to: receive a handover notification sent;
  • a processor configured to establish a connection with the terminal when the receiver receives the handover notification sent by the terminal, where the network address of the access point is recorded in the handover notification, and establishing a connection with the terminal Sending a confirmation character to the terminal;
  • the processor is further configured to: when the network address recorded by the switch notification received by the receiver does not include the network address of the access point, disconnect the terminal.
  • the ninth possible implementation manner of the sixth aspect is further provided.
  • the processor configured to determine, by the at least one of the remaining access points, the access point of the received test data packet whose channel state parameter is greater than the first threshold, as the target access point, specifically:
  • the processor is configured to: interact with the at least one remaining access point to exchange channel state parameters of test packets received by each other; The access point of the received test data packet whose channel state parameter is greater than the first threshold is determined as the target access point.
  • the tenth possible implementation manner of the sixth aspect is further provided.
  • the processor configured to determine, by the at least one remaining access point, that the channel state parameter of the received test data packet is less than the first threshold value, and the access point that is greater than the second threshold value is determined as a relay connection Entry points, including:
  • the processor configured to interact with the at least one remaining access point to exchange channel state parameters of the test data packets received by each other;
  • the channel state parameter is any one of the following parameters: Intensity, signal-to-noise ratio SNR, channel matrix.
  • the invention provides an access point selection method, a terminal, and an access point, which can send a test data packet to at least one access point; receive some or all of the at least one access point according to the test data packet.
  • Sending a response data packet determining a target access point according to a channel state parameter of the response data packet or a receiving channel state parameter carried by the response data packet; or receiving a response data packet sent by an access point,
  • the access point is determined to be the target access point.
  • the AP is connected to the preset AP according to the fixed correspondence, and the connection relationship is single, and the AP that is better than the preset AP network signal cannot be selected.
  • the target access point can be determined in the at least one access point according to the channel state parameter of the response data packet, and the target access point can provide a stronger network signal for the terminal, thereby improving the data transmission speed.
  • FIG. 1 is a flowchart of an access point selection method according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a fourth data interaction in the embodiment of the present invention.
  • FIG. 6 is a flowchart of another method for selecting an access point according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of an access point according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of another access point according to an embodiment of the present invention. detailed description
  • An embodiment of the present invention provides an access point selection method, where the method is applied to a terminal, as shown in FIG. 1, the method includes:
  • Step 101 Send a test data packet to at least one access point.
  • the at least one access point is all access points or partial access points of all access points searched by the terminal. If it is all access points, the terminal sends a test data packet to the at least one access point by broadcasting. If it is a part of all the access points, the terminal sends a test data packet to the at least one access point in a multicast manner.
  • Step 102a If receiving a response data packet sent by multiple access points according to the test data packet, determining according to a channel state parameter of the response data packet or a receiving channel state parameter carried by the response data packet Target access point.
  • Step 102b If receiving a response packet sent by an access point, determining the access point as the target access point.
  • the embodiments of the present invention provide two methods for determining a target access point, which are respectively:
  • the test data packet sent by the terminal to all or part of the searched access points the access point responds to the response data packet after receiving the test data packet, and the terminal determines the target access point according to the received response data packet. That is, if a plurality of access points are received according to the response data packet sent by the test data packet, the target access point is determined according to the channel state parameter of the response data packet or the received channel state parameter carried by the response data packet. .
  • the channel state parameter is any one of the following parameters: signal strength, signal to noise ratio, S igna l to No i se Rat io, channel matrix.
  • the received power is used to indicate the specific value of the signal strength. According to different parameter discriminating rules, the access point corresponding to the response packet with the best channel state can be determined as the target access point.
  • the multiple access points searched by the terminal exchange data with each other to determine one or more target access points, and the target access point sends a response data packet to the terminal to determine which access points are targeted for access. point. That is: if a response packet sent by one access point (may be multiple) is received, the access point is determined as the target access point.
  • An access point selection method provided by an embodiment of the present invention is capable of transmitting a test data packet to at least one access point; and receiving a response data packet sent by multiple access points according to the test data packet, according to the response Determining a target access point by a channel state parameter of the data packet or a receiving channel state parameter carried by the response data packet; if receiving a response data packet sent by the access point, determining the access point as the target access point .
  • the connection to the preset AP is based on a fixed correspondence, and the connection relationship is single, and an AP that is better than the preset AP network signal cannot be selected.
  • the target access point can be determined in at least one access point according to the channel state parameter of the response data packet, and the target access point can provide a stronger network signal for the terminal, thereby improving the data transmission speed.
  • test data packet is a null data packet (Nul l Data Packet, abbreviated as NDP).
  • the test data packet can be a space-time data packet NDP or a non-empty data packet.
  • the null data packet is used to detect the channel strength, so it does not carry the data that needs to be transmitted.
  • Non-empty data packets except for inspection The channel state parameter can also be measured to carry the data to be transmitted.
  • an empty data packet is selected as the test data packet.
  • the access point selection method provided by the embodiment of the present invention can select different test data packets according to the needs of data transmission.
  • a null data packet is selected as the test data packet, since the data volume of the data packet is small, the cost of the access point selection can be saved, and the rate of the access point selection can be improved.
  • a non-empty data packet is selected as the test data packet, the target access point can be determined without affecting the normal data transmission, and the data transmission efficiency is improved.
  • the method further includes:
  • the access point selection method provided by the embodiment of the present invention can send an acknowledgement data packet to the target access point after receiving the response data packet sent by the target access point, thereby preventing the target access point from repeatedly transmitting the response data packet. At the same time, avoid multiple responses that occur during multicast or broadcast.
  • the method further includes:
  • NDPA NDP Announcement
  • the access point selection method provided by the embodiment of the present invention can send a null data packet advertisement before sending a null data packet to at least one access point, thereby preventing the access point from mistakenly identifying the null data packet sent by the terminal as an error data packet. .
  • an access point discards an erroneous packet when it receives an erroneous packet.
  • the receiving, by the access point, the response data packet sent by the access point includes:
  • a beamforming report a beamforming report, which is used to describe channel state information (CSI) between the terminal and the access point.
  • CSI channel state information
  • the beamforming report may also carry received power and equal signal to noise ratio SNR and the like.
  • the beamforming report is carried in a unicast frame sent by the target access point to the terminal.
  • the terminal first sends a null packet advertisement to each access point in broadcast or multicast mode, and then sends an empty data packet.
  • At least one access point determines an access point as a target access point through information interaction, and the target access point sends a beamforming report to the terminal.
  • the terminal After receiving the beamforming report, the terminal sends a Block ACK (BA) packet to the target access point.
  • BA Block ACK
  • the terminal can learn the signal state of the target access point according to the received beamforming report, and then change the target access point according to the signal strength of the access point to achieve real-time change.
  • the access point with the best signal state is determined as the target access point, further increasing the rate of data transmission.
  • the sending the test data packet to the at least one access point further comprising: sending an empty data packet request to the partial access point of the at least one access point according to the preset sending list.
  • the preset transmission list is used to record a part of the access points of the at least one access point; and the receiving the response data packet sent by the multiple access points according to the test data packet includes: receiving the partial connection An empty packet sent by the ingress.
  • the null data packet request carries a reply time.
  • the receiving the response data packet sent by the multiple access points according to the test data packet includes: receiving the null data packet sent by the part of the access point according to the reply time.
  • the preset transmission list includes an identification number of each of the at least one access point, and the identification number corresponds to a different reply time.
  • the manner of determining the reply time according to the identification number may be any one of the following: determined according to a predetermined ratio, determined according to a hash algorithm.
  • the way to determine the reply time according to the predetermined ratio is to multiply the identification number by the preset time unit to obtain the reply time. If the preset time interval is 5 s, if the identification number is 1, the access point responds to the response packet after 5 s. If the identification number is 2, the access point replies to the response packet after 10 s.
  • the access point selection method provided by the embodiment of the present invention can only send the identifier of the access point in the null data packet request, and obtain a specific reply time through the access point calculation, thereby reducing the amount of data in the communication process, thereby speeding up The speed at which the access point is selected.
  • an entry for the reply time can be added to the preset send list, thereby eliminating the need for calculations.
  • a null packet request with a reply time is sent to the access point.
  • the access point selection method provided by the embodiment of the present invention can carry the reply time in the null data packet request, thereby saving the computing resources of the access point, and carrying the reply in the null data packet request for the network with a higher network transmission rate. Time does not have a significant impact on data transmission time, so it can improve the processing efficiency of the access point.
  • the sending the test data packet to the at least one access point further includes: sending, by the preset duration, an access point in the unsent state in the preset sending list The packet requests NDPR.
  • receiving the response data packet sent by the multiple access points according to the test data packet comprising: receiving an empty data packet sent by the access point in the unsent state according to the null data packet request.
  • the transmission state of the access point After receiving the null data packet sent by the access point in the unsent state according to the null data packet request, the transmission state of the access point is modified from being sent to being sent.
  • the terminal sends a null data packet request to each access point according to the preset duration, and the access point does not need to determine a specific reply time, but only after receiving the null data packet request, directly The request can be replied, thereby saving system resources of the access point and improving the processing capability of the access point.
  • the determining the target access point according to the response data packet includes:
  • the access point corresponding to the optimal channel state parameter is determined as the target access point.
  • channel state parameter described in the embodiment of the present invention is any one of the following parameters: signal strength, signal to noise ratio SNR, and channel matrix.
  • null data packets with optimal channel state parameters are as follows:
  • the channel state parameter is a channel matrix, then select a channel matrix full rank and singular value or An empty data packet with the most uniform distribution of eigenvalues;
  • an empty data packet with the best received power or SNR and the channel matrix full rank and the singular value or the eigenvalue distribution is most uniformly selected. If it cannot be satisfied at the same time, select the empty packet that meets the most conditions.
  • the method for selecting an access point when receiving a null data packet sent by each access point, the terminal calculates a channel state parameter of a channel used for receiving the null data packet, and obtains an optimal channel state parameter.
  • the empty data packet, and then the access point that sends the null data packet with the best channel state parameter is determined, and the access point is determined as the target access point.
  • the access point with the best signal state can be determined as the target access point in at least one access point, thereby improving the efficiency of data transmission.
  • a non-empty data packet can also be sent to determine the target access point.
  • the test packet can also be a spatiotemporal packet. As shown in FIG. 5, the method further includes:
  • the handover notification includes a destination address, and the destination address is a network address of the access point that receives the handover notification.
  • the handover notification can be captured by the access point that can be radiated to the terminal.
  • the access point identifies the destination address in the handover notification. If the destination address matches the network address of the access point itself, the handover notification is received, and the content of the handover notification is executed.
  • the content of the handover notification is to establish a connection between the access point pointed to by the destination address and the terminal.
  • an acknowledgement character is sent to the terminal.
  • the access point B sends a confirmation word ACK to the terminal.
  • the terminal sends a handover notification (Receiver Swi tch) to the access point A, and the destination address of the handover notification is the access point A.
  • both access point A and access point B capture the handover notification, and divide Do not identify the destination address. Since the network address of access point A is the same as the destination address in the handover notification, access point A establishes a connection with the terminal. After the connection is established, the access point A sends a confirmation character to the terminal to indicate that the connection is established.
  • a handover notification (Receiver Swi tch) is sent to the target access point, and the target access point is changed until the status parameter is obtained with all access points.
  • the access point selection method provided by the embodiment of the present invention can sequentially acquire the state parameters of each access point while transmitting data, and determine the target access point while not affecting the normal data transmission, thereby improving data transmission. effectiveness.
  • An embodiment of the present invention further provides an access point selection method. As shown in FIG. 6, the method includes:
  • Step 601 The access point receives the test data packet sent by the terminal.
  • Step 602 The access point and the at least one remaining access point determine that the access point of the received test data packet whose channel state parameter is greater than the first threshold is determined as the target access point, and the remaining access points are sent by the received terminal.
  • the access point of the test packet other than the access point.
  • Step 603 If the access point is the target access point, send a response data packet to the terminal.
  • the method further includes:
  • the access point and the at least one remaining access point determine that the channel state parameter of the received test data packet is less than the first threshold value, and the access point that is greater than the second threshold value is determined as the relay access point;
  • the access point is the relay access point, forwarding the data packet sent by the terminal to the target access point.
  • test data packet is an empty data packet.
  • the method further includes:
  • the method before the receiving, by the access point, the null data packet sent by the terminal, the method further includes: receiving, by the terminal, an empty data packet notification NDP Announcement;
  • the method further includes:
  • the beamforming Repor is sent to the terminal, and the beamforming report is used to describe channel state information (CS I ) between the terminal and the access point. Further, the beamforming is also used to describe received power, signal to noise ratio, and the like.
  • the access point receives the test data packet sent by the terminal, and further includes:
  • the sending the response data packet to the terminal according to the test data packet includes:
  • the access point receives the test data packet sent by the terminal, and further includes:
  • the sending the response data packet to the terminal according to the test data packet includes:
  • the method further includes: if receiving the handover notification sent by the terminal, establishing a connection with the terminal, where the handover notification includes the connection a network address of the ingress, after establishing a connection with the terminal, sending a confirmation character to the terminal;
  • the connection with the terminal is disconnected.
  • the access point and the at least one remaining access point determine the access point of the received test data packet whose channel state parameter is greater than the first threshold as the target access point, and specifically includes:
  • the access point of the received test packet whose channel state parameter is greater than the first threshold is determined as the target access point.
  • the access point and the at least one remaining access point determine that the channel state parameter of the received test data packet is less than the first threshold value, and the access point that is greater than the second threshold value is determined as the relay connection.
  • Entry points including:
  • the at least one access point that the terminal can search for is composed of the access point and the at least one remaining access point, after the access point and each of the remaining access points determine the relay access point and the target access point, when the terminal When the target access point sends the data packet, the relay access point forwards the data packet, and the target access point receives the data packet sent by the at least one relay access point and the data packet sent by the terminal, and then merges the data packets.
  • the merging method is not limited to: maximum ratio merging.
  • only one target threshold is set, and an access point or a remaining access point corresponding to a channel parameter greater than the target threshold is determined as a target access point, thereby obtaining multiple target access points.
  • the channel state of each target access point can improve the communication quality.
  • the embodiment of the present invention further provides a terminal.
  • the terminal includes: a sending unit 71, configured to send a test data packet to at least one access point;
  • the receiving unit 72 is configured to receive a response data packet sent by multiple access points according to the test data packet;
  • a determining unit 73 configured to: when the receiving unit 72 receives the response data packet sent by the multiple access points according to the test data packet, according to the channel state parameter of the response data packet or the response data packet Receiving channel state parameters determine a target access point;
  • the receiving unit 72 is further configured to: receive a response data packet sent by an access point; the determining unit 73 is further configured to: when the receiving unit 72 receives an access point, When the data packet is responded, the access point is determined as the target access point.
  • the sending unit 71 is configured to send the test data packet to the at least one access point, and specifically includes:
  • the sending unit 71 is configured to send a null data packet to the at least one access point.
  • the sending unit 71 is further configured to send an acknowledgment data packet to the target access point, where the acknowledgment data packet is used by the terminal to establish a connection relationship with the target access point.
  • the sending unit 71 is further configured to: send a null packet advertisement to the access point, so that the access point indicated in the null packet advertisement waits to receive the null data packet.
  • the receiving unit 72 is configured to receive a response data packet sent by an access point, and specifically includes:
  • the receiving unit 72 is configured to receive a beamforming report sent by the access point, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • the sending unit 71 is configured to send the test data packet to the at least one access point, and specifically includes:
  • the sending unit 71 is configured to send a null data packet request to a part of the at least one access point according to the preset sending list, where the preset sending list is used to record partial access in the at least one access point.
  • the receiving unit 72 is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and specifically includes:
  • the receiving unit 72 is configured to receive an empty data packet sent by the part of the access point.
  • the empty data packet request carries a reply time
  • the receiving unit 72 is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and specifically includes:
  • the receiving unit 72 is configured to receive, according to the reply time, an empty data packet sent by the part of the access point.
  • the sending unit is configured to send the test data packet to the at least one access point, and further includes: The sending unit is configured to send, by using a preset duration, an empty data packet request to an access point in an unsent state in the preset sending list;
  • the receiving unit is configured to receive a response data packet sent by each of the at least one access point according to the test data packet, and further includes:
  • the receiving unit is configured to receive, by the access point in the unsent state, an empty data packet that is sent according to the null data packet request.
  • the determining unit 73 is configured to determine, according to the channel state parameter of the response data packet or the received channel state parameter carried by the response data packet, the target access point, including:
  • the determining unit 73 is configured to calculate, according to each received null data packet, a channel state parameter of an access point that sends the null data packet;
  • the access point corresponding to the optimal channel state parameter is determined as the target access point.
  • the sending unit 71 is further configured to send a handover notification to another access point, where the network address of the another access point is recorded in the handover notification, and the another access point is the An access point of the at least one access point that is not connected to the terminal;
  • the receiving unit 72 is further configured to: receive an acknowledgement character ACK sent by the another access point; the determining unit 73 is further configured to: when the receiving unit 72 receives the acknowledgement sent by the another access point The character ACK determines that a connection has been established with the other access point.
  • the channel state parameter is any one of the following parameters: signal strength, signal to noise ratio SNR, and channel matrix.
  • the embodiment of the present invention further provides an access point, where the access point is an access point, as shown in FIG. 8, the access point includes:
  • the receiving unit 81 is configured to receive a test data packet sent by the terminal.
  • a determining unit 82 configured to determine, by the at least one remaining access point, an access point that has a channel state parameter of the test data packet received by the receiving unit 81 that is greater than the first threshold, as the target access point, where the remaining The ingress point is an access point other than the access point of the test data packet sent by the terminal, and the sending unit 83 is configured to: when the determining unit 82 obtains the access point as the target access point, Sending a response packet to the terminal Further, the determining unit 82 is further configured to: determine, by the at least one remaining access point, that the channel state parameter of the received test data packet is less than the first threshold value and is greater than the second threshold value. For relaying access points;
  • the sending unit 83 is further configured to: when the determining unit 82 obtains the access point as the relay access point, forward the data packet sent by the terminal to the target access point.
  • the receiving unit 81 is configured to receive the test data packet sent by the terminal, and specifically includes: the receiving unit 81, configured to receive the null data packet sent by the terminal.
  • the receiving unit 81 is further configured to: receive an acknowledgment data packet sent by the terminal, where the acknowledgment data packet is used to establish a connection relationship with the terminal.
  • the receiving unit 81 is further configured to: receive a null data packet advertisement sent by the terminal; and wait to receive the null data packet according to the null data packet advertisement.
  • the sending unit 83 is further configured to: send a beamforming message to the terminal, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • the receiving unit 81 is configured to receive the test data packet sent by the terminal, and further includes: the receiving unit 81, configured to receive a null data packet request sent by the terminal, where the empty data packet request carries a reply time;
  • the sending unit 83 is configured to send a response data packet to the terminal, including:
  • the sending unit 83 is configured to send a null data packet to the terminal according to the reply time. Further, the receiving unit 81 is configured to receive a test data packet sent by the terminal, and further includes: receiving a null data packet request sent by the terminal;
  • the sending unit 83 is configured to send a response data packet to the terminal, and further includes:
  • the sending unit 83 is configured to directly send an empty data packet to the terminal according to the null data packet request.
  • the receiving unit 81 is further configured to: receive a handover notification sent;
  • connection unit configured to establish a connection with the terminal when the receiving unit 81 receives the handover notification sent by the terminal, where the network address of the access point is recorded in the handover notification, and the terminal is established with the terminal After connecting, sending a confirmation character to the terminal;
  • the connecting unit is further configured to: when the network address recorded by the switching notification received by the receiving unit 81 does not include the network address of the access point, disconnect the terminal.
  • the determining unit 82 is configured to determine, as the target access point, the access point that is used by the at least one remaining access point to determine that the channel state parameter of the received test data packet is greater than the first threshold, and specifically includes:
  • the determining unit 82 is configured to: interact with the at least one remaining access point to exchange channel state parameters of test packets received by each other;
  • the access point of the received test packet whose channel state parameter is greater than the first threshold is determined as the target access point.
  • the determining unit 82 is configured to determine, with the at least one remaining access point, that the channel state parameter of the received test data packet is less than the first threshold value and the access point that is greater than the second threshold value is determined as Relay access points, including:
  • the determining unit 82 is configured to perform channel state parameters of the test data packets received by the at least one remaining access point with each other;
  • the channel state parameter is any one of the following parameters: signal strength, signal to noise ratio SNR, and channel matrix.
  • the embodiment of the present invention further provides a terminal.
  • the terminal includes: a transmitter 91, configured to send a test data packet to at least one access point;
  • a receiver 92 configured to receive a response data packet sent by multiple access points according to the test data packet
  • a processor 93 configured to: when the receiver 92 receives multiple access points, send according to the test data packet Responding to the data packet, determining a target access point according to a channel state parameter of the response data packet or a received channel state parameter carried by the response data packet;
  • the receiver 92 is further configured to receive a response data packet sent by an access point
  • the processor 93 is further configured to: when the receiver 92 receives a response packet sent by an access point, determine the access point as a target access point. Further, the transmitter 91 is configured to send the test data packet to the at least one access point, specifically:
  • the transmitter 91 is configured to send a null data packet to at least one access point.
  • the transmitter 91 is further configured to send an acknowledgment data packet to the target access point, where the acknowledgment data packet is used by the terminal to establish a connection relationship with the target access point.
  • the transmitter 91 is further configured to send a null packet advertisement to the access point, so that the access point indicated in the null packet advertisement waits to receive the null data packet.
  • the receiver 92 is configured to receive a response packet sent by an access point, including:
  • the receiver 92 is configured to receive a beamforming report sent by the access point, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • the transmitter 91 is configured to send a test data packet to the at least one access point, where the method includes:
  • the transmitter 91 is configured to send a null data packet request to a part of the at least one access point according to the preset sending list, where the preset sending list is used to record partial access in the at least one access point.
  • the receiver 92 is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and specifically includes:
  • the receiver 92 is configured to receive an empty data packet sent by the part of the access point.
  • the empty data packet request carries a reply time
  • the receiver 92 is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and specifically includes:
  • the receiver 92 is configured to receive, according to the reply time, an empty data packet sent by the part of the access point.
  • the sending unit is configured to send the test data packet to the at least one access point, and further includes:
  • the sending unit is configured to send one of the preset sending lists to each other at a preset duration
  • the sending access point sends an empty data packet request
  • the receiving unit is configured to receive a response data packet that is sent by the multiple access points according to the test data packet, and further includes:
  • the receiving unit is configured to receive an empty data packet that is sent by the access point in the unsent state according to the null data packet request.
  • the processor 93 is configured to determine, according to the channel state parameter of the response data packet or the received channel state parameter carried by the response data packet, the target access point, including:
  • the processor 93 is configured to calculate, according to each received null data packet, a channel state parameter of an access point that sends the null data packet;
  • the access point corresponding to the optimal channel state parameter is determined as the target access point.
  • the transmitter 91 is further configured to send a handover notification to another access point, where the handover notification includes a network address of the another access point, and the another access point is the An access point of the at least one access point that is not connected to the terminal;
  • the receiver 92 is further configured to: receive an acknowledgement character ACK sent by the another access point; the processor 93 is further configured to: when the receiver 92 receives the acknowledgement sent by the another access point The character ACK determines that a connection has been established with the other access point.
  • the channel state parameter is any one of the following parameters: signal strength, signal to noise ratio SNR, and channel matrix.
  • the embodiment of the present invention further provides a terminal.
  • the access point is an access point, and the access point includes:
  • a receiver 1001 configured to receive a test data packet sent by the terminal
  • the processor 1002 is configured to determine, by the at least one remaining access point, the access point of the test data packet of the test data packet received by the receiver 1001 that is greater than the first threshold as the target access point, where the remaining The ingress point is an access point of the test data packet sent by the terminal except the access point; the transmitter 1003 is configured to: when the processor 1002 obtains the access point as the target access point, Sending a response data packet to the terminal;
  • the transmitter 1003 is further configured to: when the processor 1002 obtains the access point, the middle And following the access point, forwarding the data packet sent by the terminal to the target access point.
  • the processor 1002 is further configured to: determine, by the at least one remaining access point, that the channel state parameter of the received test data packet is less than a first threshold value and is greater than a second threshold value. For relaying access points;
  • the transmitter 1003 is further configured to: when the processor 1002 obtains the access point as the relay access point, forward the data packet sent by the terminal to the target access point.
  • the receiver 1001 is configured to receive the test data packet sent by the terminal, and specifically includes: the receiver 1001, configured to receive an empty data packet sent by the terminal.
  • the receiver 1001 is further configured to: receive an acknowledgment data packet sent by the terminal, where the acknowledgment data packet is used to establish a connection relationship with the terminal.
  • the receiver 1 001 is further configured to: receive an empty data packet advertisement sent by the terminal; and wait to receive the null data packet according to the null data packet advertisement.
  • the transmitter 1003 is further configured to send a beamforming message to the terminal, where the beamforming report is used to describe channel state information between the terminal and the access point.
  • the receiver 1 001 is configured to receive a test data packet sent by the terminal, and further includes: the receiver 1001, configured to receive a null data packet request sent by the terminal, where the empty data packet request carries a reply time ;
  • the transmitter 1003 is configured to send a response data packet to the terminal, including:
  • the transmitter 1003 is configured to send a null data packet to the terminal according to the reply time. Further, the receiver 1 001 is configured to receive a test data packet sent by the terminal, and further includes: receiving a null data packet request sent by the terminal;
  • the transmitter 1003 is configured to send a response packet to the terminal, and further includes:
  • the transmitter 1003 is configured to directly send an empty data packet to the terminal according to the null data packet request.
  • the receiver 1 001 is further configured to: receive a handover notification sent;
  • the processor 1002 is configured to establish a connection with the terminal when the receiver 1001 receives the handover notification sent by the terminal, where the network address of the access point is recorded in the handover notification, After the connection with the terminal, sending a confirmation character to the terminal;
  • the processor 1002 is further configured to: when the network address recorded by the handover notification received by the receiver 1001 does not include the network address of the access point, disconnect the terminal.
  • the processor 1002 is configured to determine, as the target access point, the access point that is used by the at least one remaining access point to determine that the channel state parameter of the received test data packet is greater than the first threshold, and specifically includes:
  • the processor 1002 is configured to: interact with the at least one remaining access point to perform channel state parameters of test packets received by each other;
  • the access point of the received test packet whose channel state parameter is greater than the first threshold is determined as the target access point.
  • the processor 1002 is configured to determine, with the at least one remaining access point, that the channel state parameter of the received test data packet is less than the first threshold and is greater than the second threshold.
  • Relay access points including:
  • the processor 1002 is configured to perform, by using the at least one remaining access point, a channel state parameter of a test data packet received by each other;
  • the channel state parameter is any one of the following parameters: signal strength, signal to noise ratio SNR, and channel matrix.

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Abstract

L'invention concerne un procédé de sélection de point d'accès, un terminal, et un point d'accès, qui permettent au terminal de sélectionner un autre point d'accès (AP) de bonne qualité quand un AP prédéterminé auquel le terminal doit être connecté ne peut pas fournir une transmission de données normale en raison du fait que le nombre d'accès maximum tend à être atteint ou pour toute autre raison, pour ainsi améliorer le débit de transmission de données du terminal. Le procédé comporte : (101) l'étape consistant à envoyer un paquet de données d'essai à au moins un point d'accès; (102a) si des paquets de données de réponse envoyés par de multiples points d'accès en fonction du paquet de données d'essai sont reçus, l'étape consistant à déterminer un point d'accès cible en fonction de paramètres d'état de canal des paquets de données de réponse ou des paramètres d'état de canal de réception portés dans les paquets de données de réponse; et (102b) si un paquet de données de réponse envoyé par un point d'accès est reçu, l'étape consistant à déterminer le point d'accès comme étant un point d'accès cible. La présente invention s'applique à un processus dans lequel un terminal effectue une transmission de données par le biais d'un point d'accès.
PCT/CN2013/090013 2013-12-19 2013-12-19 Procédé de sélection de point d'accès, terminal, et point d'accès WO2015089808A1 (fr)

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PCT/CN2013/090013 WO2015089808A1 (fr) 2013-12-19 2013-12-19 Procédé de sélection de point d'accès, terminal, et point d'accès

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