WO2016188245A1 - Système, station et procédé de négociation de canal - Google Patents

Système, station et procédé de négociation de canal Download PDF

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Publication number
WO2016188245A1
WO2016188245A1 PCT/CN2016/078991 CN2016078991W WO2016188245A1 WO 2016188245 A1 WO2016188245 A1 WO 2016188245A1 CN 2016078991 W CN2016078991 W CN 2016078991W WO 2016188245 A1 WO2016188245 A1 WO 2016188245A1
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WO
WIPO (PCT)
Prior art keywords
bandwidth
channel reservation
receiving station
response
channel
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PCT/CN2016/078991
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English (en)
Chinese (zh)
Inventor
杨柳
吕开颖
邢卫民
孙波
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中兴通讯股份有限公司
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Publication of WO2016188245A1 publication Critical patent/WO2016188245A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load

Definitions

  • This document relates to, but is not limited to, channel technology in the field of wireless communications, and in particular to a channel negotiation method, station and system in a wireless local area network.
  • WLAN Wireless Local Area Networks
  • IEEE 802.11 group of the Institute of Electrical and Electronics Engineers has defined a series of standards such as 802.11a/b/g/n/ac to meet the growing demand for communication.
  • the dynamic channel detection threshold is an alternative technology for improving the channel multiplexing rate and improving the network efficiency, which has attracted extensive attention and research.
  • an access point AP, Access Point
  • STA, Station stations
  • BSS basic service set
  • FIG. 1 Show.
  • IEEE 802.11 proposes a reservation channel mechanism. 2 is a schematic diagram of a channel reservation on a 20 MHz bandwidth channel.
  • the sending station sends a Request To Send (RTS) frame, which includes a transmission opportunity (TXOP, Transmission Opportunity), indicating that the transmitting station needs to complete the frame exchange.
  • RTS Request To Send
  • TXOP Transmission Opportunity
  • CTS Clear To Send
  • Other listening sites that hear the RTS or CTS set a Network Allocation Vector (NAV), and the value of the NAV is set to the maximum value in the above two time domains, during which the listening site does not send data. , thereby avoiding hidden nodes competing for channels and causing collisions. After the NAV is reduced to zero, the listening site can send data.
  • NAV Network Allocation Vector
  • the IEEE 802.11a/c protocol defines a method for reserving a large bandwidth channel using RTS or CTS. Taking the 80MHz bandwidth as an example, as shown in FIG.
  • the transmitting station transmits the RTS on the 80MHz bandwidth, and the RTS frame uses 20MHz as the basic bandwidth, and repeats 3 times to occupy the entire 80MHz.
  • the receiving station checks whether the 80MHz bandwidth is occupied. If a part of the bandwidth is occupied, the receiving station can only reply to the CTS on the primary channel and the available secondary channel connected to the primary channel, and carry the available bandwidth indication in the CTS.
  • the transmitting station transmits data according to the bandwidth indication information indicated by the CTS.
  • the embodiments of the present invention provide a channel negotiation method, a station, and a system, which can obtain and protect bandwidth resources as much as possible before data exchange starts, thereby effectively improving spectrum utilization.
  • the embodiment of the invention provides a channel negotiation method, and the method includes:
  • the bandwidth extension indication information is identified by using at least one bit in the channel reservation request message, or by using a preset coding manner.
  • the channel reservation request message further includes a request bandwidth, where the request bandwidth is a maximum bandwidth requested by the receiving station, and the request bandwidth is an integer multiple of a basic bandwidth.
  • the sending a channel reservation request message includes:
  • the channel reservation request message is simultaneously transmitted on the basic bandwidth included in the request bandwidth.
  • the channel reservation request message further includes duration information of the transmission opportunity.
  • the channel reservation request message is used by the receiving station to parse out the bandwidth extension indication information, and when the bandwidth extension indication information is allowed, the bandwidth extension indication information is used to trigger the receiving station.
  • the specific time period is a time for performing at least one channel detection
  • the response bandwidth includes at least one basic bandwidth
  • the response bandwidth support is greater than a request bandwidth
  • the channel reservation request message is used by the receiving station to parse out the bandwidth extension indication information, and when the bandwidth extension indication information is not allowed, the extension indication information is used to trigger the receiving station. Determining the response bandwidth according to a state of a channel in a specific time period before receiving the channel reservation request message, and feeding back a response bandwidth by using the channel reservation confirmation message;
  • the response bandwidth is less than or equal to the request bandwidth included in the channel reservation request message, and the specific time period is a time for completing at least one channel detection.
  • the channel reservation confirmation message is simultaneously sent by the receiving station on a basic bandwidth included in the response bandwidth.
  • the channel reservation confirmation message is sent by the receiving station correspondingly using different transmission powers on at least two basic bandwidths included in the response bandwidth.
  • sending data to the receiving station according to the response bandwidth of the receiving station that is fed back by the receiving station in the channel reservation confirmation message includes:
  • Part of the bandwidth or the entire bandwidth of the occupied bandwidth is the transmission bandwidth;
  • Data is transmitted to the receiving station using the determined transmission bandwidth.
  • the transmission bandwidth includes at least one basic bandwidth, and the transmission bandwidth is less than or equal to the response bandwidth.
  • sending data to the receiving station according to the response bandwidth of the receiving station that is fed back by the receiving station in the channel reservation confirmation message includes:
  • the channel reservation confirmation message fed back by the receiving station includes a response bandwidth greater than the requested bandwidth, detecting a partial idle bandwidth or all idle bandwidth of the response bandwidth in a specific period before transmitting the radio frame, where the specific time period is used The time at which the channel detection is completed at least once;
  • the detected idle bandwidth is used as the transmission bandwidth to transmit data to the receiving station.
  • sending data to the receiving station according to the response bandwidth of the receiving station that is fed back by the receiving station in the channel reservation confirmation message includes:
  • the specific time period is the time for completing at least one channel detection.
  • An embodiment of the present invention further provides a channel negotiation method, where the method includes:
  • the channel reservation confirmation message includes a response bandwidth of the receiving station, and the response bandwidth information is used to enable the receiving station to send data according to the response bandwidth.
  • the bandwidth extension indication information is identified by using at least one bit in the channel reservation request message, or by using a preset coding manner.
  • the channel reservation request message further includes a request bandwidth, where the request bandwidth is the maximum bandwidth information requested by the receiving station, and the request bandwidth is an integer multiple of the basic bandwidth.
  • the channel reservation request message includes duration information of the transmission opportunity.
  • the sending a channel reservation confirmation message to the sending station includes:
  • bandwidth extension indication information When the bandwidth extension indication information is allowed, according to the received channel reservation request message
  • the status of the channel in the previous specific time period, and the response bandwidth of the receiving station is fed back to the sending station by using a channel reservation confirmation message, where the response bandwidth is the maximum bandwidth currently available to the receiving station;
  • the specific time period is a time for performing at least one channel detection
  • the response bandwidth includes at least one basic bandwidth
  • the response bandwidth support is greater than a request bandwidth
  • the sending a channel reservation confirmation message to the sending station includes:
  • the bandwidth extension indication information When the bandwidth extension indication information is not allowed, determining the response bandwidth according to a state of a channel in a specific time period before receiving the channel reservation request message, and feeding back to the sending station by using the channel reservation confirmation message In response to the bandwidth, the response bandwidth is less than or equal to the requested bandwidth included in the channel reservation request message.
  • the sending a channel reservation confirmation message to the sending station includes:
  • the channel reservation confirmation message is simultaneously transmitted on the basic bandwidth included in the response bandwidth.
  • the sending a channel reservation confirmation message to the sending station includes:
  • the channel reservation confirmation message includes time length information until the end of the transmission opportunity.
  • An embodiment of the present invention further provides a sending site, where the sending site includes:
  • a first sending unit configured to send a channel reservation request message, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to indicate that the receiving station performs bandwidth extension feedback; and the receiving station is in the channel reservation Confirming a response bandwidth of the receiving station fed back in the message, and transmitting data to the receiving station;
  • the first receiving unit is connected to the first sending unit and configured to receive a channel reservation message sent by the receiving station.
  • the first sending unit is configured to simultaneously send the channel reservation request message on a basic bandwidth included in the request bandwidth.
  • the first sending unit is configured to be implemented according to the following manner Receiving, by the receiving station, a response bandwidth of the receiving station that is fed back in the channel reservation confirmation message, and transmitting data to the receiving station: determining a partial bandwidth of the response bandwidth according to a response bandwidth included in the channel reservation confirmation message fed back by the receiving station Or the total bandwidth is the transmission bandwidth, or the bandwidth occupied by the occupied bandwidth is determined as the transmission bandwidth according to the bandwidth occupied by the channel reservation confirmation message.
  • the first sending unit includes:
  • a first detecting module configured to: when the channel reservation confirmation message fed back by the receiving station includes a response bandwidth greater than the requested bandwidth, detecting a partial idle bandwidth or all idle bandwidth of the response bandwidth in a specific period before transmitting the wireless frame
  • the specific time period is a time for performing at least one channel detection
  • the first sending module is configured to send data to the receiving station by using the idle bandwidth detected by the first detecting module as a transmission bandwidth.
  • the first sending unit includes:
  • a second detecting module configured to detect an idle state of the response bandwidth in a specific period before transmitting the radio frame in a transmission opportunity of the channel reservation, and determine a transmission bandwidth according to the obtained detection result, where the specific time period is used for The time at which the channel detection is completed at least once;
  • the second sending module is configured to transmit data to the receiving station by using the transmission bandwidth.
  • An embodiment of the present invention further provides a receiving site, where the receiving site includes:
  • a second receiving unit configured to receive a reservation request message sent by the sending station, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to indicate that the receiving station performs bandwidth extension feedback;
  • the second sending unit is connected to the second receiving unit, and is configured to send a channel reservation confirmation message to the sending station, where the channel reservation confirmation message includes a response bandwidth of the receiving station, and the response bandwidth information And configured to enable the receiving station to send data according to the response bandwidth information.
  • the second sending unit is configured to implement the sending to the sending station by: Transmitting a channel reservation confirmation message: parsing the channel reservation request message to obtain the bandwidth extension indication information; and when the bandwidth extension indication information is allowed, according to a state of a channel in a specific time period before receiving the channel reservation request message, Responding to the sending station, by using a channel reservation confirmation message, a response bandwidth of the receiving station, where the response bandwidth is a maximum bandwidth currently available to the receiving station;
  • the length of the specific time period is a time for performing at least one channel detection
  • the response bandwidth includes at least one basic bandwidth
  • the response bandwidth support is greater than a request bandwidth
  • the second sending unit is configured to: send a channel reservation confirmation message to the sending station by: parsing the channel reservation request message to obtain the bandwidth extension indication information; and when the bandwidth extension indication information is not When yes, determining the response bandwidth according to a state of a channel in a specific time period before receiving the channel reservation request message, and feeding back the response bandwidth to the sending station by using the channel reservation confirmation message, where the response bandwidth is less than or It is equal to the request bandwidth included in the channel reservation request message.
  • the second sending unit is configured to simultaneously send the channel reservation confirmation message on a basic bandwidth included in the response bandwidth.
  • the second sending unit is configured to send the channel reservation confirmation message corresponding to using different transmission powers on at least two basic bandwidths included in the response bandwidth.
  • An embodiment of the present invention further provides a channel negotiation system, where the system includes: a sending station and a receiving station;
  • the sending station is configured to provide a channel reservation request message to the receiving station, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to indicate that the receiving station performs bandwidth extension feedback;
  • the receiving station is configured to send a channel reservation confirmation message to the sending station, where the channel reservation confirmation message includes a response bandwidth of the receiving station.
  • An embodiment of the present invention further provides a computer storage medium, where the computer storage medium is stored Computer executable instructions are stored for performing the above method.
  • the sending station instructs the receiving station to perform bandwidth extension feedback through the channel reservation request message, so that the receiving station can perform bandwidth expansion according to the channel reservation request message, and the subsequent actually used transmission bandwidth can be greater than the bandwidth requested by the sending station, thereby Increased transmission bandwidth and increased frequency utilization.
  • FIG. 1 is an example of a WLAN basic service set BSS
  • 3 is a schematic diagram of channel reservation under a large bandwidth
  • FIG. 4 is a flowchart of implementing a channel negotiation method on a sending station side according to an embodiment of the present invention
  • FIG. 5 is a flowchart of implementing a channel negotiation method on a receiving station side according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a receiving station according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a sending station according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of a channel negotiation system according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of channel negotiation in an embodiment of the present invention.
  • 10 is a schematic diagram of reducing power feedback channel reservation confirmation information in channel negotiation
  • FIG. 11 is a schematic diagram of a transmission site using a requested bandwidth for data transmission after a channel negotiation fails
  • FIG. 12 is a schematic diagram of a sending station detecting a specific time period when the response bandwidth is greater than the requested bandwidth
  • FIG. 13 is a schematic diagram of a transmission station detecting a channel and selecting a transmission bandwidth within a specific time period in a transmission opportunity.
  • the related technology can only perform bandwidth negotiation and determine the available channel at the beginning of the TXOP. Once the TXOP starts, the transmission bandwidth cannot be changed (the actual transmission bandwidth is less than or equal to the requested bandwidth), resulting in low spectrum utilization; on the other hand, the WLAN is The unlicensed wireless network band interference changes very quickly, and in the TXOP, there are also band resources from busy to idle. The related technologies cannot effectively utilize these idle resources, and also affect the frequency utilization.
  • the embodiment of the present invention describes a channel negotiation method, which is applied to a sending station, as shown in FIG. 4, and includes the following steps:
  • Step S101 Send a channel reservation request message, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to instruct the receiving station to perform bandwidth extension feedback.
  • the bandwidth extension indication information is used by using at least one bit identifier in the channel reservation request message, or is identified by using a preset coding manner.
  • the coding mode used in the embodiment of the present invention is not specifically limited.
  • the sending station may send a channel reservation request message in one of the following ways:
  • the channel reservation request message further includes a request bandwidth, where the request bandwidth is a maximum bandwidth requested by the receiving station, and the request bandwidth is an integer multiple of a basic bandwidth, and correspondingly, the sending channel reservation request may be
  • the channel reservation request message is simultaneously transmitted on the basic bandwidth included in the request bandwidth.
  • the channel reservation request message may further include time length information until the end of the transmission opportunity, that is, the duration of the transmission opportunity.
  • the channel reservation request message is used by the receiving station to parse the bandwidth extension indication information, where the bandwidth extension indication information is used to trigger the receiving station to receive according to the bandwidth extension indication information.
  • a state of the channel in a specific time period before the channel reservation request message, and a response bandwidth of the receiving station is fed back through a channel reservation confirmation message, where the response bandwidth is a maximum bandwidth currently available to the receiving station; correspondingly, the The length of the specific time period is the time for performing at least one channel detection, for example, the frame interval can be coordinated with the point (PIFS, Point
  • the length of the Interframe Space is corresponding to an integer multiple of the basic bandwidth (that is, including at least one basic bandwidth), and the response bandwidth support is greater than the requested bandwidth, thereby implementing bandwidth expansion; in practical applications, when When the bandwidth extension indication information is allowed, and the bandwidth resource is limited, the response bandwidth fed back by the receiving station may also be equal to or smaller than the requested bandwidth.
  • the channel reservation request message is used by the receiving station to parse the bandwidth extension indication information, where the extension indication information is used to trigger the receiving station to receive according to the bandwidth extension indication information. Determining the response bandwidth in a specific time period before the channel reservation request message, and feeding back a response bandwidth through the channel reservation confirmation message, the response bandwidth being less than or equal to the request included in the channel reservation request message Bandwidth, the length of the specific time period corresponds to the length of the PIFS.
  • the sending station of the channel reservation confirmation message includes: transmitting, by the receiving station, a frame structure, a modulation mode, and a rate identified by the receiving station support; and the channel reservation confirmation message is received by the receiving station. Simultaneously transmitting the basic bandwidth included in the response bandwidth; the channel reservation confirmation message is sent by the receiving station correspondingly using different transmission powers on at least two basic bandwidths included in the response bandwidth; wherein the channel reservation confirmation
  • the message may also include length of time information until the end of the transmission opportunity.
  • Step S102 Send data to the receiving station according to a response bandwidth of the receiving station fed back by the receiving station in a channel reservation confirmation message.
  • Step S102 may be implemented in the following manner: determining, according to the response bandwidth included in the channel reservation confirmation message fed back by the receiving station, part or all of the bandwidth of the response bandwidth is a transmission bandwidth, or according to correctly receiving the channel reservation confirmation message
  • the occupied bandwidth determines a part of the bandwidth or the entire bandwidth of the occupied bandwidth as a transmission bandwidth; and sends data to the receiving station by using the determined transmission bandwidth.
  • Step S102 may be implemented in the following manner: when the channel reservation confirmation message fed back by the receiving station includes a response bandwidth greater than the requested bandwidth, detecting a partial idle bandwidth or all of the response bandwidth in a specific period before transmitting the radio frame.
  • An idle bandwidth the length of the specific time period corresponding to the length of the PIFS; transmitting data to the receiving station by using the detected idle bandwidth as a transmission bandwidth; and detecting the idle bandwidth by using a specific period before transmitting the radio frame, Bandwidth recovery that becomes idle is used as a transmission bandwidth, further improving spectrum utilization.
  • the embodiment of the present invention further provides a channel negotiation method, which is applied to a receiving station, as shown in FIG. 5, and includes the following steps:
  • Step S201 Receive a reservation request message sent by the sending station, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to instruct the receiving station to perform bandwidth extension feedback.
  • Step S202 sending a channel reservation confirmation message to the sending station.
  • the channel reservation confirmation message includes a response bandwidth of the receiving station, and the response bandwidth information is used to enable the receiving station to send data according to the response bandwidth information.
  • the bandwidth extension indication information is identified by using at least one bit in the channel reservation request message, or is identified by using a preset coding manner.
  • the channel reservation request message may further include a request bandwidth, where the request bandwidth is the maximum bandwidth information requested by the receiving station, and the request bandwidth is an integer multiple of the basic bandwidth; the channel reservation request message may further include The length of time that the transmission opportunity ends (that is, the duration of the transmission opportunity).
  • the sending a channel reservation confirmation message to the sending station may be performed by parsing the channel reservation request message to obtain bandwidth extension indication information; when the bandwidth extension indication information is allowed, according to receiving the channel
  • the status of the channel in the specific time period before the reservation request message, and the response bandwidth of the receiving station is fed back to the sending station by using a channel reservation confirmation message, where the response bandwidth is the maximum bandwidth currently available to the receiving station;
  • the specific time period is a time for performing at least one channel detection, for example, may correspond to a length of a PIFS, the response bandwidth is an integer multiple of a basic bandwidth, and the response bandwidth support is greater than a request bandwidth.
  • the sending a channel reservation confirmation message to the sending station may be performed by: parsing the channel reservation request message to obtain bandwidth extension indication information; and when the bandwidth extension indication information is not allowed, according to receiving the The state of the channel in a specific time period before the channel reservation request message determines the response bandwidth, and the response bandwidth is fed back to the sending station by the channel reservation confirmation message, where the response bandwidth is less than or equal to that included in the channel reservation request message. Request bandwidth.
  • the sending a channel reservation confirmation message to the sending station may be in one of the following ways:
  • the channel reservation confirmation message may include time length information until a transmission opportunity ends.
  • an embodiment of the present invention further describes a sending station 10.
  • the sending station 10 includes:
  • the first sending unit 30 is configured to send a channel reservation request message, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to indicate that the receiving station performs bandwidth extension feedback;
  • the first receiving unit 40 is connected to the first sending unit 30, and configured to receive a channel reservation message sent by the receiving station; and according to a response bandwidth of the receiving station that is received by the receiving station in a channel reservation confirmation message, Send data to the receiving site.
  • the bandwidth extension indication information is identified by using at least one bit in the channel reservation request message, or is identified by using a preset coding manner.
  • the first transmitting unit 30 is configured to transmit the channel reservation request message according to a frame structure identified by the receiving station support.
  • the channel reservation request message further includes a request bandwidth, where the request bandwidth is the maximum bandwidth information requested by the receiving station, and the request bandwidth is an integer multiple of the basic bandwidth.
  • the first sending unit 30 is configured to simultaneously transmit the channel reservation request message on a basic bandwidth included in the request bandwidth.
  • the channel reservation request message includes time length information until the end of the transmission opportunity.
  • the channel reservation request message is used by the receiving station to parse the bandwidth extension indication information, where the bandwidth extension indication information is used to trigger the receiving station to receive according to the bandwidth extension indication information.
  • the channel reservation confirmation message a response bandwidth of the receiving station by using a channel reservation confirmation message, where the response bandwidth is a maximum bandwidth currently available to the receiving station, to a state of the channel in a specific time period before the channel reservation request message;
  • the length of the specific time period corresponds to the length of the PIFS
  • the response bandwidth includes at least one basic bandwidth
  • the response bandwidth support is greater than the requested bandwidth
  • the channel reservation request message is used by the receiving station to parse the bandwidth extension indication information, where the extension indication information is used to trigger the receiving station to receive according to the bandwidth extension indication information. Determining the response bandwidth in a specific time period before the channel reservation request message, and feeding back a response bandwidth through the channel reservation confirmation message, the response bandwidth being less than or equal to the request included in the channel reservation request message bandwidth;
  • the response bandwidth is less than or equal to the request bandwidth included in the channel reservation request message, and the length of the specific time period corresponds to the length of the PIFS.
  • the channel reservation confirmation message is sent by the receiving station according to a frame structure, a modulation mode, and a rate identified by the receiving station support.
  • the channel reservation confirmation message is simultaneously transmitted by the receiving station on a basic bandwidth included in the response bandwidth.
  • the channel reservation confirmation message is sent by the receiving station correspondingly using different transmission powers on at least two basic bandwidths included in the response bandwidth.
  • the channel reservation confirmation message includes time length information until the end of the transmission opportunity.
  • the first sending unit 30 is further configured to determine, according to a response bandwidth included in the channel reservation confirmation message fed back by the receiving station, part or all of the bandwidth of the response bandwidth as a transmission bandwidth, or according to the correct reception.
  • the bandwidth occupied by the channel reservation confirmation message determines that part of the bandwidth or the entire bandwidth of the occupied bandwidth is a transmission bandwidth;
  • the transmission bandwidth is an integer multiple of a basic bandwidth, and the transmission bandwidth is less than or equal to the response bandwidth.
  • the first sending unit 30 includes:
  • the first detecting module 301 is configured to: when the channel reservation confirmation message fed back by the receiving station includes a response bandwidth greater than the request bandwidth, detecting a partial idle bandwidth or all idles of the response bandwidth in a specific period before transmitting the radio frame Bandwidth, the length of the specific time period corresponding to the length of the PIFS;
  • the first sending module 302 (connected to the first detecting module 301) is configured to transmit data to the receiving station by using the idle bandwidth detected by the first detecting module 301 as a transmission bandwidth.
  • the first sending unit 30 includes:
  • the second detecting module 303 is configured to detect, in a transmission opportunity of the channel reservation, an idle state of the response bandwidth in a specific period before transmitting the radio frame, and determine a transmission bandwidth according to the obtained detection result, the length of the specific time period. Corresponding to the length of the PIFS;
  • the second sending module 304 (connected to the second detecting module 303) is configured to transmit data to the receiving station by using the transmission bandwidth.
  • the first sending unit 30 can be implemented by a transmitter and an antenna device in the transmitting station
  • the first receiving unit 40 can be implemented by a receiver and an antenna device in the receiving station.
  • an embodiment of the present invention further describes a receiving station 20.
  • the receiving station 20 includes:
  • the second receiving unit 50 is configured to receive a reservation request message sent by the sending station, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to indicate that the receiving station performs bandwidth extension feedback;
  • the second sending unit 60 is connected to the second receiving unit 50, and is configured to send a channel reservation confirmation message to the sending station, where the channel reservation confirmation message includes a response bandwidth of the receiving station, and the response bandwidth information. And configured to enable the receiving station to send data according to the response bandwidth information.
  • the bandwidth extension indication information is identified by using at least one bit in the channel reservation request message, or is identified by using a preset coding manner.
  • the channel reservation request message further includes a request bandwidth, where the request bandwidth is The maximum bandwidth information requested by the receiving station, and the request bandwidth is an integer multiple of the basic bandwidth.
  • the channel reservation request message includes time length information until the end of the transmission opportunity, that is, duration information of the transmission opportunity.
  • the second sending unit 60 is further configured to parse the channel reservation request message to obtain bandwidth extension indication information; when the bandwidth extension indication information is allowed, according to the specific before receiving the channel reservation request message a status of the channel in the time period, and the response bandwidth is fed back to the sending station by using a channel reservation confirmation message, where the response bandwidth is a maximum bandwidth currently available to the receiving station;
  • the length of the specific time period corresponds to the length of the PIFS
  • the response bandwidth includes at least one basic bandwidth
  • the response bandwidth support is greater than the requested bandwidth
  • the second sending unit 60 is further configured to parse the channel reservation request message to obtain bandwidth extension indication information; when the bandwidth extension indication information is not allowed, according to before receiving the channel reservation request message
  • the state of the channel in the specific time period determines the response bandwidth, and the response bandwidth is fed back to the sending station by the channel reservation confirmation message, the response bandwidth being less than or equal to the request bandwidth included in the channel reservation request message.
  • the second transmitting unit 60 is configured to transmit the channel reservation confirmation message according to a frame structure, a modulation scheme, and a rate identified by the receiving station support.
  • the second transmitting unit 60 is configured to simultaneously transmit the channel reservation confirmation message on a basic bandwidth included in the response bandwidth.
  • the second sending unit 60 is configured to send the channel reservation confirmation message using different transmission powers on at least two basic bandwidths included in the response bandwidth.
  • the channel reservation confirmation message includes time length information until the end of the transmission opportunity.
  • the second receiving unit 50 can be implemented by a receiver and an antenna device in the receiving station 40
  • the second transmitting unit 60 can be implemented by a transmitter and an antenna device in the receiving station 40.
  • the embodiment of the present invention further describes a channel negotiation system 70, as shown in FIG. 8, comprising: at least one transmitting station 10 and at least one receiving Site 20; wherein
  • the sending station 10 is configured to send a channel reservation request message to the receiving station 20, where the channel reservation request message includes bandwidth extension indication information, where the bandwidth extension indication information is used to instruct the receiving station 20 to perform bandwidth extension feedback; Transmitting data to the receiving station 20 according to the response bandwidth of the receiving station 20 fed back by the receiving station 20 in the channel reservation confirmation message;
  • the receiving station 20 is configured to send a channel reservation confirmation message to the sending station 10, wherein the channel reservation confirmation message includes a response bandwidth of the receiving station 20.
  • the transmitting station 10 is arranged to transmit the channel reservation request message in accordance with a frame structure supported by the receiving station 20.
  • the request bandwidth is the maximum bandwidth requested to the receiving site 20, and the request bandwidth is an integer multiple of the base bandwidth.
  • the transmitting station 10 is configured to simultaneously transmit the channel reservation request message on a basic bandwidth included in the requested bandwidth.
  • the channel reservation request message includes time length information until the end of the transmission opportunity; the response bandwidth is an integer multiple of the basic bandwidth, and the response bandwidth support is greater than the request bandwidth.
  • the channel reservation confirmation message includes time length information until the end of the transmission opportunity.
  • the sending station 10 is configured to determine, according to the response bandwidth included in the channel reservation confirmation message fed back by the receiving station 20, part or all of the bandwidth of the response bandwidth as a transmission bandwidth, or according to the correct reception.
  • the bandwidth occupied by the channel reservation confirmation message is determined, and part or all of the bandwidth of the occupied bandwidth is determined as a transmission bandwidth;
  • Data is transmitted to the receiving station 20 using the determined transmission bandwidth.
  • the transmission bandwidth is an integer multiple of a basic bandwidth, and the transmission bandwidth is less than or equal to the response bandwidth.
  • the sending station 10 is configured to: when the channel reservation confirmation message fed back by the receiving station includes a response bandwidth greater than the request bandwidth, detecting a partial idle of the response bandwidth in a specific period before transmitting the radio frame Bandwidth or all free bandwidth, length of the specific time period Corresponding to the length of the PIFS; transmitting data to the receiving station 20 using the detected idle bandwidth as the transmission bandwidth.
  • the sending station 10 is configured to detect an idle state of the response bandwidth in a specific period before transmitting a radio frame within a transmission opportunity of a channel reservation, and determine a transmission bandwidth according to the obtained detection result;
  • the transmission bandwidth transmits data to the receiving station 20, and the length of the specific time period corresponds to the length of the PIFS.
  • the embodiment of the invention further describes a computer storage medium, wherein the computer storage medium stores executable instructions, and the executable instructions are used to execute the channel negotiation method shown in FIG. 4 or FIG. 5.
  • This embodiment mainly describes how to perform channel extension using the indication information.
  • Site A has data waiting to be transmitted to Site B.
  • Site A first waits for a specific interframe space in the primary channel according to the traditional channel contention access method, such as distributed coordinated interframe space (DIFS, Distributed Interframe Space), or Arbitration Interframe Space (AIFS). Then proceed to Back-Off.
  • DIFS distributed coordinated interframe space
  • AIFS Arbitration Interframe Space
  • the station A transmits the channel reservation request frame before the PIFS monitors the busy channel of the secondary channel (that is, the state in which the monitoring is busy or idle).
  • station A detects that the primary channel and the adjacent secondary 20 MHz channel are idle, and then starts transmitting a channel reservation request frame (corresponding channel reservation request message), here an RTS frame, on the primary and secondary channels.
  • the RTS frame is transmitted in a frame structure that is recognized by the receiving station.
  • the address of the receiving station B, the request bandwidth of 40 MHz, the transmission duration of the TXOP, and the like are carried.
  • station A in the Service field of the RTS frame uses the reserved meaning to indicate that the receiving station B performs channel extension.
  • the station B After receiving the RTS frame, the station B detects the idle condition of the secondary channel according to the PIFS period before the RTS frame. In this example, the three secondary 40 MHz channels of Site B are freely available. After the short interframe space (SIFS, Short Interframe Space), the station B feeds back a channel reservation confirmation message, here a CTS frame, on all available channels, and the CTS frame is also transmitted in a frame structure recognized by the receiving station.
  • the CTS frame carries 80MHz response bandwidth information.
  • Site A After receiving the CTS frame, Site A parses the response bandwidth to 80 MHz. Site A then uses 80 MHz as the transmission bandwidth to send data to Site B.
  • This embodiment mainly describes how the receiver reduces the power feedback channel reservation confirmation message during the channel extension negotiation process, thereby achieving the purpose of reducing interference.
  • Site A has data waiting to be transmitted to Site B.
  • Site A firstly waits for a specific interframe space, such as DIFS, or AIFS, in accordance with the conventional channel contention access method on the primary channel, and then performs a fallback.
  • the AFS of the station A before the channel reservation request frame is sent to monitor the busy channel of the secondary channel.
  • station A detects that the primary channel and the adjacent secondary 20 MHz channel are idle, and then starts transmitting the RTS frame simultaneously on the primary and secondary channels.
  • the address of the receiving station B the request bandwidth of 40 MHz, the transmission duration of the TXOP, and the like are carried.
  • station A in the physical frame header of the RTS frame uses a specific bit to indicate that the receiving station B performs channel extension.
  • the station B After receiving the RTS frame, the station B detects the idle condition of the secondary channel according to the PIFS period before the RTS frame.
  • the three secondary 40 MHz channels of Site B are freely available.
  • Site B Because the RTS frame only requests 40MHz bandwidth, Site B judges that there are interferences on the other two secondary 20MHz channels on the site A side. Therefore, after the SIFS, the station B reduces the power to transmit the CTS feedback CTS frame. In this example, Site B transmits CTS frames using 14 decibels milliwatts (dBm) on each of the basic bandwidths within the requested bandwidth, and transmits CTS frames using 10 dBm on the other two secondary 20 MHz channels.
  • dBm decibels milliwatts
  • Site A correctly received the CTS frame on the 80 MHz bandwidth. Site A then uses 80 MHz as the transmission bandwidth to send data to Site B.
  • This embodiment mainly describes an example in which the channel extension reservation fails, and the transmitting station uses the original request bandwidth for data transmission.
  • Site A has data waiting to be transmitted to Site B.
  • Site A firstly waits for a specific interframe space, such as DIFS or AIFS, in accordance with the conventional channel contention access method on the primary channel, and then performs Back-Off.
  • station A is transmitting channel pre- The PIFS before the request frame monitors the busyness of the secondary channel.
  • station A detects that the primary channel and the adjacent secondary 20 MHz channel are idle, and then starts transmitting the RTS frame simultaneously on the primary and secondary channels.
  • the address of the receiving station B the request bandwidth of 40 MHz, the transmission duration of the TXOP, and the like are carried.
  • station A in the MAC frame header of the RTS frame uses a specific field to indicate that the receiving station B performs channel extension.
  • the station B After receiving the RTS frame, the station B detects the idle condition of the secondary channel according to the PIFS period before the RTS frame.
  • the three secondary 20 MHz channels of Site B are freely available.
  • Site B Because the RTS frame only requests 40MHz bandwidth, Site B judges that there are interferences on the other two secondary 40MHz channels on the site A side. Therefore, station B lowers the power feedback signal CTS frame after the short frame interval SIFS. In this example, Site B transmits CTS frames using 14 dBm on each of the basic bandwidths within the requested bandwidth, and transmits CTS frames using 10 dBm on the other two secondary 40 MHz channels.
  • the station A Due to interference on the two secondary 20 MHz channels on the A side of the station, the station A only receives the CTS frame on the requested bandwidth, and does not correctly receive the CTS frame on the two secondary channels. Site A then uses the 40 MHz request bandwidth as the transmission bandwidth to send data to Site B.
  • This embodiment mainly describes how the transmitting station determines the transmission bandwidth when the response bandwidth is greater than the requested bandwidth.
  • Site A has data waiting to be transmitted to Site B.
  • Site A firstly waits for a specific interframe space, such as DIFS, or AIFS, in accordance with the conventional channel contention access method on the primary channel, and then performs a fallback.
  • the station A monitors the busy channel of the secondary channel in the PIFS (corresponding to a specific time period) before transmitting the channel reservation request frame.
  • station A detects that the primary channel and the adjacent secondary 20 MHz channel are idle, and then starts transmitting the channel reservation request frame, here an RTS frame, on the primary and secondary channels.
  • the channel reservation request frame here an RTS frame
  • the address of the receiving station B the request bandwidth of 40 MHz, the transmission duration of the TXOP, and the like are carried.
  • station A in the Service field of the RTS frame uses the reserved meaning to indicate that the receiving station B performs channel extension.
  • the station B After receiving the RTS frame, the station B detects the idle condition of the secondary channel according to the PIFS period before the RTS frame.
  • the three secondary 20 MHz channels of Site B are freely available.
  • Site B is after SIFS, On all available channels, a feedback channel reservation acknowledgement message, here a CTS frame, is fed back.
  • the CTS frame carries 80MHz response bandwidth information.
  • Site A After receiving the CTS frame, Site A parses the response bandwidth to 80 MHz. Site A listens to the channel at 80 MHz of the response bandwidth during the next PIFS time and determines that the channel is idle. Site A uses 80 MHz as the transmission bandwidth to send data to Site B.
  • This embodiment mainly describes how the transmitting station determines the transmission bandwidth when the response bandwidth is greater than the requested bandwidth.
  • Site A has data waiting to be transmitted to Site B.
  • Site A first waits for a specific interframe space (such as DIFS, or AIFS) on the primary channel in accordance with the conventional channel contention access method, and then performs a fallback.
  • the station A monitors the busy channel of the secondary channel in the PIFS (corresponding to a specific time period) before transmitting the channel reservation request frame.
  • station A detects that the primary channel and the adjacent secondary 20 MHz channel are idle, and then starts transmitting the channel reservation request frame, here an RTS frame, on the primary and secondary channels.
  • the channel reservation request frame here an RTS frame
  • the address of the receiving station B the request bandwidth of 40 MHz, the transmission duration of the TXOP, and the like are carried.
  • station A in the Service field of the RTS frame uses the reserved meaning to indicate that the receiving station B performs channel extension.
  • the station B After receiving the RTS frame, the station B detects the idle condition of the secondary channel according to the PIFS period before the RTS frame. In this example, the three secondary 20 MHz channels of Site B are freely available. After the SIFS, the site B feeds back the channel reservation acknowledgement message, here the CTS frame, on all available channels.
  • the CTS frame carries 80MHz response bandwidth information.
  • Site A After receiving the CTS frame, Site A parses the response bandwidth to 80 MHz. Site A listens to the channel at 80 MHz of the response bandwidth during the next PIFS time. Only the primary channel and the adjacent secondary 20 MHz channel are still idle. Site A uses this 40 MHz channel to transmit data to Site B.
  • Site A After completing a frame exchange with Site B, Site A still has data to send to Site B. During the next PIFS period, station A continues to listen to the channel at 80 MHz of the response bandwidth. At this time, it is judged that the channel is idle, and station A uses 80 MHz as the transmission bandwidth to transmit data to station B.
  • the sending station instructs the receiving station to perform bandwidth extension feedback through the channel reservation request message, so that the receiving station can perform bandwidth expansion according to the response bandwidth, and subsequently
  • the used transmission bandwidth can be larger than the requested bandwidth, thereby increasing the transmission bandwidth and improving the frequency utilization.
  • the steps may be performed by a program instruction related hardware, and the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the steps of the foregoing method embodiment; and the foregoing storage medium includes: mobile storage A device that can store program code, such as a device, a random access memory (RAM), a read-only memory (ROM), a magnetic disk, or an optical disk.
  • program code such as a device, a random access memory (RAM), a read-only memory (ROM), a magnetic disk, or an optical disk.
  • the above-described integrated unit of the present invention may be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a standalone product.
  • the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for making
  • a computer device which may be a personal computer, server, or network device, etc.
  • the foregoing storage medium includes various media that can store program codes, such as a mobile storage device, a RAM, a ROM, a magnetic disk, or an optical disk.
  • the foregoing technical solution realizes that the transmission bandwidth actually used by the sending station is larger than the bandwidth requested by the sending station, thereby improving the transmission bandwidth and improving the frequency utilization.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un système, une station et un procédé de négociation de canal. Le procédé comprend les étapes consistant : à envoyer un message de demande de réservation de canal, le message de demande de réservation de canal comprenant des informations d'instruction d'extension de largeur de bande, les informations d'instruction d'extension de largeur de bande étant utilisées pour donner des consignes à une station de réception de procéder à une rétroaction d'extension de largeur de bande ; et, en fonction d'une largeur de bande de réponse de la station de réception renvoyée dans un message d'accusé de réception de réservation de canal par la station de réception, à envoyer des données à la station de réception.
PCT/CN2016/078991 2015-05-27 2016-04-11 Système, station et procédé de négociation de canal WO2016188245A1 (fr)

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