WO2016110163A1 - 用于对数据传输进行保护的方法、装置及站点、接入点 - Google Patents

用于对数据传输进行保护的方法、装置及站点、接入点 Download PDF

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Publication number
WO2016110163A1
WO2016110163A1 PCT/CN2015/095714 CN2015095714W WO2016110163A1 WO 2016110163 A1 WO2016110163 A1 WO 2016110163A1 CN 2015095714 W CN2015095714 W CN 2015095714W WO 2016110163 A1 WO2016110163 A1 WO 2016110163A1
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Prior art keywords
transmission
transmission protection
protection message
station
resource allocation
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PCT/CN2015/095714
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English (en)
French (fr)
Inventor
杜振国
卢伟山
杨云松
容志刚
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华为技术有限公司
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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 BR112017014752A priority Critical patent/BR112017014752A2/pt
Priority to JP2017536258A priority patent/JP2018501730A/ja
Priority to RU2017127924A priority patent/RU2017127924A/ru
Priority to CN201580072986.6A priority patent/CN107113866A/zh
Priority to EP15876663.4A priority patent/EP3240351A4/en
Publication of WO2016110163A1 publication Critical patent/WO2016110163A1/zh
Priority to US15/643,720 priority patent/US20170308710A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037Inter-user or inter-terminal allocation
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60Protecting data
    • G06F21/606Protecting data by securing the transmission between two devices or processes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • H04L5/0094Indication of how sub-channels of the path are allocated
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/2603Signal structure ensuring backward compatibility with legacy system
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/04Interfaces between hierarchically different network devices
    • H04W92/10Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, an apparatus, a station, and an access point for protecting data transmission.
  • WiFi technology has also evolved into a next-generation WiFi HEW (High Efficiency WLAN) technology with higher system capacity, mainly considering AP (Access Point) and STA (Station).
  • a scheduling-based OFDMA (Orthogonal Frequency Division Multiple Access) data transmission mechanism or MU MIMO (Multi-User Multiple-Input Multiple-Output) is adopted. technology).
  • OFDMA Orthogonal Frequency Division Multiple Access
  • MU MIMO Multi-User Multiple-Input Multiple-Output
  • the process of the basic OFDMA data transmission mechanism includes: the AP sends a Trigger frame, where the resource scheduling information of the multiple STAs is included, and the scheduled STA interacts with the AP at the corresponding time and frequency band according to the resource scheduling information in the Trigger frame.
  • the OBSS Overlapping Basic Service Set
  • the data transmission process needs to avoid mutual interference between data transmissions to ensure the reliability of transmission. .
  • the traditional data transmission protection method is the RTS/CTS (Request to Send/Clear to Send) mechanism.
  • the specific process includes: the data transmission direction data receiver sends an RTS frame, where the data sender calculates the duration according to the known data transmission amount. After the data receiver correctly receives the RTS frame, it replies to the data sender with a CTS frame carrying the duration.
  • the duration carried in the CTS frame is based on the duration carried in the RTS frame minus the duration occupied by the transmission of the CTS frame and the values after the two SIFS (Short Inte-frame Space). Due to the broadcast characteristics of the wireless channel, CTS frames can be received by other WiFi devices.
  • These WiFi devices will set their own NAV (Network Allocation Vector) according to the duration carried in the CTS frame, that is, set a countdown timer. Before the NAV is reduced to 0, the WiFi device does not actively initiate data transmission, thereby avoiding the ongoing data transmission. Interference. Obviously, the duration carried in the CTS frame is equivalent to preserving a period of exclusive time for data transmission, which is a protection for subsequent data transmission, so that the duration carried in the CTS frame can be called a protection.
  • the information transmitted by the data that is, the transmission protection message.
  • the transmission channel and the reception channel of the STA are completely determined by the AP, and the data transmission protection will become more complicated.
  • a transport channel is fixedly divided into a plurality of subchannels, each having a bandwidth of 20 MHz.
  • the bandwidth occupied by the CTS frame is 20 MHz, that is, if the transmission channel is fixedly divided into N subchannels, at most N CTS frames can be transmitted in the transmission channel at the same time.
  • the width of the divided minimum frequency band may be smaller than that of the legacy device, which causes the legacy device to fail to receive the HEW frame correctly.
  • the embodiment of the invention provides a method and device for protecting data transmission.
  • an embodiment of the present invention provides a method for protecting data transmission, where the method includes:
  • resource allocation information sent by the access point, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station;
  • the working frequency band is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel allocated to the station;
  • the station sends the transmission protection message in the current overlapping subchannel
  • the station sends the transmission protection message in the current overlapping subchannel according to a preset rule
  • the multiple stations transmitting the transmission protection message in the current overlapping subchannel sequentially send the transmission protection in the current overlapping subchannel.
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transmission channel.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message is a clear sending CTS frame, or an ACK frame.
  • a third possible implementation manner if the current overlapping subchannel is only used by the station to send a transmission protection message, Transmitting, by the station, the transmission protection message in the current overlapping subchannel, including:
  • the station After receiving the resource allocation information, the station is separated by a preset duration, and sends the transmission protection message in the current overlapping subchannel;
  • the station sends the transmission protection message in the current overlapping subchannel according to a preset rule, including:
  • the site After receiving the resource allocation information, the site is separated by a preset duration, and the transmission protection message is sent in the current overlapping subchannel according to a preset rule.
  • the fourth possible implementation manner if the current overlapping subchannel is only used by the station to send a transmission protection message, Transmitting, by the station, the transmission protection message in the current overlapping subchannel, including:
  • the station After the uplink data of the access point is sent, the station is separated by a preset duration, and the transmission protection message is sent in the current overlapping subchannel;
  • the station sends the transmission protection message in the current overlapping subchannel according to a preset rule, including:
  • the station After the uplink data of the access point is sent, the station is separated by a preset duration, and the transmission protection message is sent in the current overlapping subchannel according to a preset rule.
  • the Transmitting the transmission protection message in the current overlapping subchannel includes:
  • the station acquires, according to the resource allocation information, multiple sites that send the transmission protection message in the current overlapping subchannel;
  • the ordering is used to determine an order in which the plurality of stations send a transmission protection message in the current overlapping subchannel, the plurality of stations including the Site
  • the sorting rule is a preset sorting rule or a sorting rule indicated in the resource allocation information.
  • the preset collating rule includes:
  • the current overlapping subchannel Send transmission protection messages including:
  • the second sending moment is a moment for transmitting a transmission protection message, and each of the stations transmitting the transmission protection message on the current overlapping subchannel corresponds to one of the second sending moments.
  • the method further includes:
  • the station obtains transmission protection indication information from the resource allocation information, where the transmission protection indication information indicates whether the station sends a transmission protection message, or indicates whether the station is allowed to send a transmission protection message;
  • an embodiment of the present invention provides a method for protecting data transmission, where the method includes:
  • resource allocation information sent by the access point, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station;
  • the working frequency band is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel of the station;
  • the current overlapping subchannel for transmitting the transmission protection message by the station is also used by other stations to send a transmission protection message, multiple stations transmitting the transmission protection message in the current overlapping subchannel are simultaneously transmitted in the current overlapping subchannel. Transmitting a protection message, the plurality of sites including the site;
  • the transmission protection messages sent at the same time are the same;
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transport channel.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message is a clear sending CTS frame, or an ACK frame.
  • the transmitting the protection message in the at least one overlapping subchannel includes:
  • the transmission protection message is sent at an interval preset duration.
  • the sending the transmission protection message in the at least one overlapping subchannel includes:
  • the third sending moment is a time allocated by the access point to the station for the station to send the transmission protection message.
  • the simultaneously transmitting transmission protection messages are the same, including:
  • the transmission protection message transmitted at the same time is scrambled by the same scrambling code sequence
  • the transmission protection message sent at the same time adopts the same modulation and coding mode
  • the MAC layer content of the transmission protection message sent at the same time is the same.
  • the method further includes:
  • the station obtains transmission protection indication information from the resource allocation information, where the transmission protection indication information indicates whether the station sends a transmission protection message, or indicates whether the station is allowed to send a transmission protection message;
  • an embodiment of the present invention provides a method for protecting data transmission, where the method includes:
  • the access point transmits resource allocation information, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station, so that the station that receives the resource allocation information is according to the
  • the resource allocation information acquires at least one overlapping subchannel for transmitting, by the station, a transmission protection message, and transmits a transmission protection message in each of the at least one overlapping subchannel;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping the transmission channel allocated to the station;
  • the transmission protection message is used to protect the number of downlinks of the access point to the station that sends the transmission protection message
  • the transmission protection message includes a duration, the duration being used to indicate an exclusive time of the transmission of the transmission protection message to the station to which the transmission protection message is allocated.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message clears the sending CTS frame, or the ACK frame.
  • the access point after the resource allocation information is sent, if the access point is in the first duration Receiving the transmission protection message sent by the station or detecting that the working frequency band is busy, the access point sends the downlink data to the station after the second time interval after the resource allocation information is sent;
  • the access point After the resource allocation information is sent, if the working frequency band is idle within the first time period, the access point sends the downlink data to the station at the third time interval after the resource allocation information is sent.
  • the method further include:
  • the access point After receiving the uplink data, the access point receives the transmission protection message sent by the station within the first time period or detects that the working frequency band is busy, after the end of the uplink data reception, the interval is second.
  • the length of time transmits downlink data
  • the access point After receiving the uplink data sent by the station, the access point detects that the working frequency band is idle within the first time period, and after the end of the data receiving, transmits the downlink data for a third time interval.
  • an embodiment of the present invention provides a method for protecting data transmission, where the method includes:
  • the access point transmits resource allocation information, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station, so that the station that receives the resource allocation information is according to the
  • the resource allocation information acquires at least one overlapping subchannel for transmitting, by the station, a transmission protection message, and transmits a transmission protection message in each of the at least one overlapping subchannel;
  • At least two stations in the current overlapping subchannel send a transmission protection message
  • the at least two stations simultaneously send a transmission protection message, where the simultaneously transmitted transmission protection message is the same;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping the transmission channel allocated to the station;
  • the transmission protection message is used to protect downlink data of the access point to the station, where the transmission protection message includes a duration, where the duration is used to indicate that the station is to be allocated to the station.
  • the exclusive time of the channel is used to protect downlink data of the access point to the station.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message is a clear sending CTS frame, or an ACK frame.
  • the access point after the resource allocation information is sent, if the access point is in the first duration Receiving the transmission protection message sent by the station or detecting that the working frequency band is busy, the access point sends the downlink data to the station after the second time interval after the resource allocation information is sent;
  • the access point After the resource allocation information is sent, if the working frequency band is idle within the first time period, the access point sends the downlink data to the station at the third time interval after the resource allocation information is sent.
  • the method further include:
  • the station After receiving the uplink data, the station receives the transmission protection message sent by the station within the first time period or detects that the working frequency band is busy, and after the end of the uplink data reception, the second time interval is transmitted. Downstream data;
  • the access point After receiving the uplink data sent by the station, the access point detects that the working frequency band is idle within the first time period, and after the end of the data receiving, transmits the downlink data for a third time interval.
  • the first duration is a point coordination function interframe
  • the duration of the interval is the sum of the duration of two short frame intervals and the transmission duration of one transmission protection message
  • the third duration is the duration of the inter-frame spacing of the point coordination function
  • the duration of the inter-frame spacing of the point coordination function is greater than the duration of the short frame interval.
  • the protection message is the same, including:
  • the transmission protection message transmitted at the same time is scrambled by the same scrambling code sequence
  • the transmission protection message sent at the same time adopts the same modulation and coding mode
  • the MAC layer content of the transmission protection message sent at the same time is the same.
  • an embodiment of the present invention provides an apparatus for protecting data transmission, which is disposed at a site, where the apparatus includes:
  • the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station; and a first overlapping subchannel acquiring unit, configured to transmit according to the allocation a situation in which a channel and a plurality of subchannels overlap each other, acquiring at least one overlapping subchannel for transmitting a transmission protection message by the station, where a working frequency band between the access point and the station is divided into multiple subchannels,
  • the overlapping subchannel is a subchannel overlapping the transmission channel allocated to the station;
  • a first determining unit configured to determine whether each of the at least one overlapping subchannel for transmitting the transmission protection message by the station is only for the station to send the transmission protection message
  • a first sending unit configured to send the transmission protection message in the current overlapping subchannel if the current overlapping subchannel is only used by the station to send a transmission protection message
  • a second sending unit configured to send the transmission protection message in the current overlapping subchannel according to a preset rule, if the current overlapping subchannel is further configured to send a transmission protection message to another station;
  • the multiple stations transmitting the transmission protection message in the current overlapping subchannel sequentially send the transmission protection in the current overlapping subchannel.
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transmission channel.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message is a clear sending CTS frame, or an ACK frame.
  • the first sending unit is specifically configured to:
  • the transmission protection message is sent in the current overlapping subchannel after a preset interval duration
  • the second sending unit is specifically configured to:
  • the current overlapping subchannel is further configured to send the transmission protection message to the other station, after receiving the resource allocation information, the interval is preset, and the transmission protection message is sent in the current overlapping subchannel according to a preset rule.
  • the first sending unit is specifically configured to:
  • the interval is preset, and the transmission protection is sent in the current overlapping subchannel.
  • the second sending unit is specifically configured to:
  • the current overlapping subchannel is further configured to send the transmission protection message to the other station, after the uplink data to the access point is sent, the interval is preset, and the current overlapping subchannel is sent according to the preset rule. Transmit protection message.
  • the second sending unit includes:
  • a site obtaining subunit configured to acquire, according to the resource allocation information, multiple sites that send the transmission protection message in a current overlapping subchannel
  • a sorting subunit configured to sort the plurality of stations according to a sorting rule, where the sorting is used to determine an order in which the plurality of stations send a transmission protection message in the current overlapping subchannel, the multiple sites Including the site;
  • a sequence obtaining subunit configured to acquire, according to the sorting, an order in which the station sends a transmission protection message
  • a first sending time acquisition subunit configured to acquire a corresponding first sending time according to the sequence of sending the transmission protection message
  • a first sending subunit configured to send the transmission protection message at the first sending moment in a current overlapping subchannel
  • the sorting rule is a preset sorting rule or a sorting rule indicated in the resource allocation information.
  • the preset collating rule includes:
  • the second sending unit includes:
  • a second sending time acquisition subunit configured to acquire a second sending time according to the transmission protection message sending sequence or the second sending time indication information specified in the resource allocation information
  • a second sending subunit configured to send the transmission protection message at the second sending moment in the current overlapping subchannel
  • the second sending moment is a moment for transmitting a transmission protection message, and each of the stations transmitting the transmission protection message on the current overlapping subchannel corresponds to one of the second sending moments.
  • the apparatus further includes a first transmission protection indication information acquiring unit, configured to And obtaining, by the resource allocation information, transmission protection indication information, where the transmission protection indication information indicates whether the station sends a transmission protection message, or indicates whether the station is allowed to send a transmission protection message;
  • the first overlapping subchannel obtaining unit is specifically configured to: when the transmission protection indication information indicates that the station sends a transmission protection message or indicates that the station is allowed to send a transmission protection message, according to the allocated transmission channel and multiple sub A condition in which the channels overlap each other, and at least one overlapping subchannel for transmitting a transmission protection message for the station is acquired.
  • an embodiment of the present invention provides an apparatus for protecting data transmission, which is disposed at a site, where the apparatus includes:
  • the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station;
  • a second overlapping subchannel acquiring unit configured to acquire, according to the condition that the allocated transmission channel and the plurality of subchannels overlap each other, at least one overlapping subchannel for transmitting, by the station, a transmission protection message, where the access A working frequency band between the point and the station is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel allocated to the station;
  • a third sending unit configured to send the transmission protection message in the at least one overlapping subchannel
  • the current overlapping subchannel for transmitting the transmission protection message by the station is also used by other stations to send a transmission protection message, multiple stations transmitting the transmission protection message in the current overlapping subchannel are simultaneously transmitted in the current overlapping subchannel. Transmitting a protection message, the plurality of sites including the site;
  • the transmission protection messages sent at the same time are the same;
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transport channel.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message is a clear sending CTS frame, or an ACK frame.
  • the third sending unit is configured to receive the resource allocation information Thereafter, the transmission protection message is sent in the at least one overlapping subchannel by an interval preset duration;
  • the third sending unit is configured to send the transmission protection message in the at least one overlapping subchannel after the uplink data transmission to the access point is sent, by a preset duration.
  • the third sending unit is configured to receive the resource allocation information And transmitting the transmission protection message at the third transmission time according to the third transmission time specified in the resource allocation information;
  • the third sending unit is configured to send the transmission protection message at the third sending moment according to the third sending moment specified in the resource allocation information after transmitting the uplink data to the access point;
  • the third sending moment is a time allocated by the access point to the station for the station to send the transmission protection message.
  • the simultaneously transmitting transmission protection messages are the same, including:
  • the transmission protection message transmitted at the same time is scrambled by the same scrambling code sequence
  • the transmission protection message sent at the same time adopts the same modulation and coding mode
  • the MAC layer content of the transmission protection message sent at the same time is the same.
  • the apparatus further includes a second transmission protection indication information acquiring unit, configured to And obtaining, by the resource allocation information, transmission protection indication information, where the transmission protection indication information indicates whether the station sends a transmission protection message, or indicates whether the station is allowed to send a transmission transmission protection message;
  • the second overlapping subchannel obtaining unit is specifically configured to: when the transmission protection indication information indicates the site Transmitting a transmission protection message or instructing the station to transmit a transmission protection message, acquiring at least one overlapping subchannel for transmitting, by the station, a transmission protection message according to a condition that the allocated transmission channel and the plurality of subchannels overlap each other .
  • an embodiment of the present invention provides an apparatus for protecting data transmission, which is disposed at an access point, where the apparatus includes:
  • the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station, so that a station that receives the resource allocation information according to the Deriving resource allocation information to acquire at least one overlapping subchannel for transmitting, by the station, a transmission protection message, and transmitting a transmission protection message in each of the at least one overlapping subchannel;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping the transmission channel allocated to the station;
  • the transmission protection message is used to protect downlink data of the access point to a station that sends the transmission protection message, where the transmission protection message includes a duration, where the duration is used to indicate that the transmission protection is sent.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message is a clear sending CTS frame, or an ACK frame.
  • the apparatus further includes a first downlink data sending unit, After the first resource allocation information sending unit sends the resource allocation information, if the access point receives the transmission protection message sent by the station within the first time period or detects that the working frequency band is busy, the resource allocation information is sent. Afterwards, the second time interval is sent to the downlink data of the station;
  • the first downlink data sending unit is further configured to: after the first resource allocation information sending unit sends the resource allocation information, if the working frequency band is idle within the first time period, after the resource allocation information is sent, The third time interval is the downlink data sent to the site.
  • the apparatus further includes a second downlink data sending unit, configured for the access point After sending the capital After the source allocation information, receiving the uplink data sent by the station; after receiving the uplink data, if receiving the transmission protection message sent by the station within the first duration or detecting that the working frequency band is busy, After the uplink data is received, the downlink data is transmitted for the second time interval;
  • the second downlink data sending unit is further configured to: after receiving the uplink data sent by the station, if the working frequency band is detected to be idle within the first time period, after the data receiving is ended, the downlink data is transmitted at a third time interval. .
  • an embodiment of the present invention provides an apparatus for protecting data transmission, which is disposed at an access point, where the apparatus includes:
  • a second resource allocation information sending unit configured to send resource allocation information, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station, so that the resource is received And assigning, by the resource allocation information, at least one overlapping subchannel for transmitting, by the station, a transmission protection message, and transmitting transmission protection in each of the at least one overlapping subchannel Message
  • At least two stations in the current overlapping subchannel send a transmission protection message
  • the at least two stations simultaneously send a transmission protection message, where the simultaneously transmitted transmission protection message is the same;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping the transmission channel allocated to the station;
  • the transmission protection message is used to protect downlink data of the access point to the station, where the transmission protection message includes a duration, where the duration is used to indicate that the station is to be allocated to the station.
  • the exclusive time of the channel is used to protect downlink data of the access point to the station.
  • the multiple subchannels have equal bandwidths.
  • the transmission protection message is a clear sending CTS frame, or an ACK frame.
  • the apparatus further includes a third downlink data sending unit, After the second resource allocation information sending unit sends the resource allocation information, if the access point receives the transmission protection message sent by the station within the first time period or detects that the working frequency band is busy, the access point is in the resource. After the transmission of the distribution information ends, the downlink data of the second time duration is sent to the station;
  • the third downlink data sending unit is further configured to: after transmitting the resource allocation information, if the detection is performed within the first time period When the working frequency band is idle, the access point sends the downlink data to the station at a third time interval after the resource allocation information is sent.
  • the apparatus further includes a fourth downlink data sending unit, After the second resource allocation information sending unit sends the resource allocation information, the uplink data sent by the station is received;
  • the fourth downlink data sending unit is further configured to: after receiving the uplink data, if receiving the transmission protection message sent by the station within a first time period or detecting that the working frequency band is busy, receiving the uplink data After the end, the downlink data is transmitted for the second time interval;
  • the fourth downlink data sending unit is further configured to: after receiving the uplink data sent by the station, if the working frequency band is idle within the first time period, after the data receiving is ended, the downlink data is transmitted at a third time interval. .
  • an embodiment of the present invention provides a site, including:
  • a receiver configured to receive resource allocation information sent by an access point, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station;
  • a processor configured to acquire, according to the allocated transmission channel and a plurality of subchannels overlapping each other, at least one overlapping subchannel for transmitting, by the station, a transmission protection message, where the access point is connected to the site
  • the interworking frequency band is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel allocated to the station;
  • the processor is further configured to determine whether each of the at least one overlapping subchannel for transmitting the transmission protection message by the station is only for the station to send the transmission protection message;
  • a transmitter configured to send the transmission protection message in the current overlapping subchannel if the current overlapping subchannel is only used by the station to send a transmission protection message
  • the transmitter is further configured to: if the current overlapping subchannel is further configured to send a transmission protection message to another station, send the transmission protection message in the current overlapping subchannel according to a preset rule;
  • the multiple stations transmitting the transmission protection message in the current overlapping subchannel sequentially send the transmission protection in the current overlapping subchannel.
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site Pass The exclusive time of the transmission channel.
  • the transmitter is specifically configured to:
  • the transmission protection message is sent in the current overlapping subchannel after a preset interval duration
  • the transmitter is specifically configured to: if the current overlapping subchannel is further configured to send a transmission protection message to another station, after receiving the resource allocation information, the interval is preset, and the current overlapping layer is according to a preset rule.
  • the transmission protection message is sent in the channel.
  • the transmitter is specifically configured to: if the current overlapping subchannel is only used by the station to send a transmission protection message, After the uplink data of the access point is separated by a preset duration, the transmission protection message is sent in the current overlapping subchannel; or
  • the transmitter is specifically configured to: if the current overlapping subchannel is further configured to send a transmission protection message to another station, after the uplink data to the access point is sent, the interval is preset, and according to a preset rule, The transmission protection message is sent in the current overlapping subchannel.
  • an embodiment of the present invention provides a site, where the site includes:
  • a receiver configured to receive resource allocation information sent by an access point, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station;
  • a processor configured to acquire, according to the allocated transmission channel and a plurality of subchannels overlapping each other, at least one overlapping subchannel for transmitting, by the station, a transmission protection message, where the access point is connected to the site
  • the interworking frequency band is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel allocated to the station;
  • a transmitter configured to send the transmission protection message in the at least one overlapping subchannel
  • the current overlapping subchannel for transmitting the transmission protection message by the station is also used by other stations to send a transmission protection message, multiple stations transmitting the transmission protection message in the current overlapping subchannel are simultaneously transmitted in the current overlapping subchannel. Transmitting a protection message, the plurality of sites including the site;
  • the transmission protection messages sent at the same time are the same;
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transport channel.
  • an embodiment of the present invention provides an access point, where the access point includes:
  • a processor configured to generate resource allocation information
  • a transmitter configured to send resource allocation information, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the site, so that a site that receives the resource allocation information is configured according to
  • the resource allocation information acquires at least one overlapping subchannel for the station to send a transmission protection message, and sends a transmission protection message in each of the at least one overlapping subchannel;
  • a receiver configured to send, by the at least two stations, a transmission protection message if at least two stations in the current overlapping subchannel send a transmission protection message
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping the transmission channel allocated to the station;
  • the transmission protection message is used to protect downlink data of the access point to a station that sends the transmission protection message, where the transmission protection message includes a duration, where the duration is used to indicate that the transmission protection is sent.
  • the transmitter is further configured to: after the resource allocation information is sent, if the access point receives the transmission protection message or the detection sent by the station within the first duration When the working frequency band is busy, after the resource allocation information is sent, the second time interval is sent to the downlink data of the station;
  • the transmitter is further configured to: after the resource allocation information is sent, if the working frequency band is idle within the first time period, after the resource allocation information is sent, the downlink data is sent to the station at a third time interval.
  • the receiver is further configured to: after receiving the resource allocation information, receive the uplink data sent by the station;
  • the transmitter is further configured to: after receiving the uplink data, if the transmission protection message sent by the station is received within the first time period or the working frequency band is detected to be busy, after the uplink data reception ends, the interval is The second time length transmits downlink data;
  • the transmitter is further configured to: after receiving the uplink data sent by the station, if it is detected that the working frequency band is idle within the first time period, after the data receiving is ended, the downlink data is transmitted at a third time interval.
  • an embodiment of the present invention provides an access point, where the access point includes:
  • a processor configured to generate resource allocation information
  • a transmitter configured to send resource allocation information, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the site, so that a site that receives the resource allocation information is configured according to Obtaining, by the resource allocation information, at least one overlapping subchannel for transmitting, by the station, a transmission protection message, and Transmitting a transmission protection message in each of the at least one overlapping subchannels;
  • a receiver configured to: if at least two stations in the current overlapping subchannel send a transmission protection message, receive a transmission protection message that is sent by the at least two stations simultaneously, where the simultaneously transmitted transmission protection message is the same;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping the transmission channel allocated to the station;
  • the transmission protection message is used to protect downlink data of the access point to the station, where the transmission protection message includes a duration, where the duration is used to indicate that the station is to be allocated to the station.
  • the exclusive time of the channel is used to protect downlink data of the access point to the station.
  • the transmitter is further configured to: after the resource allocation information is sent, if the access point receives the transmission protection message or the detection sent by the station within the first duration When the working frequency band is busy, after the resource allocation information is sent, the second time interval is sent to the downlink data of the station;
  • the transmitter is further configured to: after the resource allocation information is sent, if the working frequency band is idle within the first time period, after the resource allocation information is sent, the downlink data is sent to the station at a third time interval.
  • the receiver is further configured to: after receiving the resource allocation information, receive the uplink data sent by the station;
  • the transmitter is further configured to: after receiving the uplink data, if the transmission protection message sent by the station is received within the first time period or the working frequency band is detected to be busy, after the uplink data reception ends, the interval is The second time length transmits downlink data;
  • the transmitter is further configured to: after receiving the uplink data sent by the station, if it is detected that the working frequency band is idle within the first time period, after the data receiving is ended, the downlink data is transmitted at a third time interval.
  • Embodiments of the present invention provide a data transmission protection method and apparatus, where a station receives resource allocation information sent by an access point, where the resource allocation information includes a transmission channel allocated by the access point to the station, and the station according to the Obtaining a status of the allocated transmission channel and the plurality of subchannels overlapping each other, acquiring at least one overlapping subchannel for transmitting the transmission protection message by the station, and transmitting a transmission protection message in the at least one overlapping subchannel, where
  • the transmission protection message includes a duration, the duration indicating the exclusive time of the station to the transmission channel allocated to it, so that the data transmission of the access point to the station is protected, so that other third-party stations according to the transmission protection message
  • the duration is set to its own duration, thereby avoiding the time and frequency band that the AP needs to perform data transmission, thereby protecting the data transmission sent by the AP to the STA, thereby improving the reliability of data transmission.
  • FIG. 1 is a flow chart showing a method for protecting data transmission according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of data transmission on a certain transmission channel according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing a superposition of a transmission channel and a subchannel according to an embodiment of the present invention
  • 4(a) and 4(b) are schematic diagrams showing a STA transmitting a CTS frame according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of a STA transmitting a transmission protection message according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of a STA according to an embodiment of the present invention.
  • FIG. 15 is a schematic diagram of an AP according to an embodiment of the present invention.
  • FIG. 16 is a flow chart showing a method for protecting data transmission according to an embodiment of the present invention.
  • the embodiment of the invention provides a method and a device for protecting data transmission, which can protect downlink data transmission from AP to STA.
  • FIG. 1 is a flowchart of a method for protecting data transmission according to an embodiment of the present invention. As shown in FIG. 1 , the method is used for a STA, and the method includes:
  • Step 101 The station receives resource allocation information sent by the access point, where the resource allocation information includes a transmission channel allocated by the access point to at least two stations including the station.
  • Step 102 The station acquires at least one overlapping subchannel for transmitting, by the station, a transmission protection message according to the condition that the allocated transmission channel and the multiple subchannels overlap each other, the access point and the site
  • the working frequency band is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel allocated to the station;
  • Step 103 Determine whether each of the at least one overlapping subchannel for transmitting the transmission protection message by the station is only for the station to send the transmission protection message;
  • Step 104 If the current overlapping subchannel only sends a transmission protection message to the station, the station sends the transmission protection message in the current overlapping subchannel.
  • Step 105 If the current overlapping subchannel is further configured to send a transmission protection message to another station, the station sends the transmission protection message in the current overlapping subchannel according to a preset rule.
  • the multiple stations transmitting the transmission protection message in the current overlapping subchannel sequentially send the transmission protection in the current overlapping subchannel.
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transmission channel.
  • Embodiments of the present invention provide a data transmission protection method and apparatus, where a station receives resource allocation information sent by an access point, where the resource allocation information includes a transmission channel allocated by the access point to the station, and the station according to the Obtaining a status of the allocated transmission channel and the plurality of subchannels overlapping each other, acquiring at least one overlapping subchannel for transmitting the transmission protection message by the station, and transmitting a transmission protection message in the at least one overlapping subchannel,
  • the transmission protection message includes a duration, the duration indicating the exclusive time of the station to the transmission channel allocated to it, so that the data transmission of the access point to the station is protected, so that other third-party stations according to the transmission protection message
  • the duration of the medium sets its own duration, thereby avoiding the time and frequency band that the AP needs to perform data transmission, thereby protecting the data transmission sent by the AP to the STA, thereby improving the reliability of data transmission.
  • the “the resource allocation information includes the transmission channel allocated by the access point to at least two stations including the station” includes two basic scenarios: for a scenario using only OFDMA, the resource allocation information includes a plurality of transport channels, each transport channel corresponding to one site; for a scenario using only MU-MIMO, the resource allocation information includes only one transport channel, and the transport channel corresponds to multiple sites, that is, multiple sites use the same transport channel Transfer.
  • a mixed scenario may also occur: the transmission channel is divided into a plurality of blocks in the frequency domain, or OFDMA is used in each block, or MU-MIMO is used, that is, OFDMA and MU-MIMO may occur simultaneously in the communication system.
  • the resource allocation information includes a transmission channel allocation for each block, and the transmission channel allocation of each block follows the rules of the basic scenario depending on whether OFDMA or MU-MIMO is used. Any station that is scheduled must be in a block, and the resource allocation in any block must correspond to one site.
  • the protocol in the embodiment of the present invention is the 802.11 protocol.
  • the bandwidths of multiple subchannels may be equal.
  • the bandwidth of each subchannel may be 20 MHz
  • the 20 MHz subchannel is an existing device (relative to future support).
  • it is the frequency band supported by the old device, and the embodiment of the present invention can be compatible with the protocol supported by the old device, thereby reducing the cost of the system upgrade.
  • the plurality of stations being scheduled have the same frequency band as the access point.
  • access points and stations operate in the 5 GHz band, which is divided into multiple 20 MHz subchannels, each having a determined center frequency.
  • the working frequency band and subchannel division are defined by the protocol, and both the access point and the site are subject to compliance. Which protocol the network follows can be obtained from the access point when the site accesses the network.
  • the bandwidths of the multiple subchannels may also be unequal.
  • the working frequency band between the access point and the station is 40 MHz, and may be divided into three subchannels, and the bandwidths are 10 MHz, 20 MHz, and 10 MHz, respectively.
  • the transmission protection message is a clear transmission CTS frame or an ACK frame
  • both types of frames are existing devices (relative to a new device supporting the solution of the embodiment of the present invention later, Old equipment) capable
  • the supported frames can be compatible with the protocols supported by the old devices, thereby reducing the cost of system upgrades.
  • the bandwidth of each sub-channel can be the same, for example, all of the 20 MHz sub-channels, which can be compatible with the existing equipment, improve the applicability of the embodiment of the present invention, and need not replace the old equipment when upgrading the existing transmission system.
  • the system upgrade cost is lower; when the transmission protection message is a CTS frame or an ACK frame, the applicability of the embodiment of the present invention can be further improved, and the protocol supported by the existing device is better compatible.
  • FIG. 3 is a schematic diagram showing overlapping of transmission channels of multiple subchannels and STAs according to an embodiment of the present invention.
  • the operating frequency band is divided into a subchannel 320, a subchannel 321 and a subchannel 322.
  • the transmission channel of STA1 is 310
  • the transmission channel of STA2 is 311
  • the transmission channel of STA3 is 312
  • the transmission channel of STA4 is 313.
  • the subchannel 320 covers all of the transport channel 310 of STA1; the subchannel 321 covers all of the transport channel 311 of STA2 and a portion of the transport channel 312 of STA3, which may be referred to simply as subchannel 321 covering the transport channel. 311 and transport channel 312; subchannel 322 covers a portion of STA3's transport channel 312 and all of STA4's transport channel 313, which may be referred to simply as subchannel 322 covering transport channel 312 and transport channel 312.
  • the transport channel 310 of STA1 covers a portion of the subchannel 320
  • the transport channel 311 of STA2 covers a portion of the subchannel 321
  • the transport channel 312 of STA3 covers a portion of the subchannel 321 and a portion of the subchannel 322
  • the transport channel 313 of the STA4 A portion of subchannel 322 is covered.
  • the overlap is mutual, i.e., for any STA, such as STA3, its transport channel 312 covers subchannel 321 and subchannel 322, and its transport channel 312 is simultaneously covered by transport channel subchannel 321 and subchannel 322.
  • the data sent from the STA to the AP may be referred to as uplink data or uplink data transmission; the data sent from the AP to the STA may be referred to as downlink data or downlink data transmission.
  • FIG. 2 is a schematic diagram of data transmission on a certain transmission channel according to an embodiment of the present invention.
  • the AP and the STA are not shown in FIG. 2.
  • the AP sends the resource allocation information 201 to a certain STA, and the STA broadcasts a transmission protection message.
  • the transmission protection message is a CTS frame 202, and the CTS frame 202 carries a duration 203.
  • the transport channel only transmits the AP's data 204 to the STA, thereby protecting the data transmission 204.
  • the resource allocation information may be a Trigger frame for triggering subsequent data transmission.
  • only the downlink data 204 of the transmitting AP to the STA may be sent, or only the downlink data 204 may be sent.
  • the uplink data 205 of the STA to the AP is transmitted.
  • the duration 203 in FIG. 2 indicates the start time, the end time, and the time duration of the duration.
  • the duration is only a value, and the measurement duration is terminated by using a Network Allocation Vector (NAV).
  • NAV Network Allocation Vector
  • NAV is equivalent to a countdown timer whose initial value is the duration. When the count of NAV becomes 0, it indicates that the exclusive time of the STA ends. Therefore, 203 in FIG. 2 can also be regarded as the NAV corresponding to the duration.
  • the role of the CTS frame sent by the STA is to protect the downlink data transmission from the AP to the STA. Therefore, if only the uplink data of the STA to the AP needs to be transmitted after the resource allocation information is transmitted, no data transmission is needed. Protect. If there is a downlink data transmission from the AP to the STA and an uplink data transmission from the STA to the AP, and the AP does not need to feed back the instant confirmation message to the STA after the end of the data transmission to the AP, the transmission protection needs to be performed, and the duration of the transmission protection is required. The data transmission to the AP to the STA ends, as shown in the duration 203 of FIG.
  • the duration of the transmission protection message sent by each STA can be determined according to the specific situation of its own scheduling.
  • the durations of CTS frames sent by different STAs may be the same or different, so that transmission protection is flexibly.
  • the CTS frames in the embodiments of the present invention may all be replaced by ACK frames.
  • the transmission protection message in the embodiment of the present invention may also be other frames that can be understood and decoded by the existing device.
  • a CTS frame will be described as an example.
  • the transmitting a protection message is sent in at least one overlapping subchannel, and the preferred solution is to send a transmission protection message in all overlapping subchannels.
  • the STA broadcasts a transmission protection message in a plurality of overlapping subchannels in sequence, so that other third-party STAs set their own duration according to the duration in the transmission protection message, thereby avoiding the AP to
  • the STA needs to perform data transmission time and frequency band, thereby protecting the data transmission sent by the AP to the STA, thereby improving the reliability of data transmission.
  • the station sends the transmission protection message in the current overlapping subchannel, including:
  • the station After receiving the resource allocation information, the station is separated by a preset duration, and sends the transmission protection message in the current overlapping subchannel;
  • step 105 if the current overlapping subchannel is further configured to send a transmission protection message to another station, the station sends the transmission protection message in the current overlapping subchannel according to a preset rule, including:
  • the site After receiving the resource allocation information, the site is separated by a preset duration, and the transmission protection message is sent in the current overlapping subchannel according to a preset rule.
  • FIG. 4(a) and 4(b) are schematic diagrams showing a STA transmitting a CTS frame according to an embodiment of the present invention.
  • the transmission channel of one STA covers two subchannels and a part of one subchannel, and only one STA of each subchannel transmits a CTS frame.
  • the transmission channel 410 of a certain STA covers a part of the subchannel 420, and also covers all of the two subchannels.
  • the two subchannels that are all covered are the subchannel 421 and the subchannel 423, respectively, and the subchannel 420 Of the 421 and 422, only the STA transmits a CTS frame.
  • 4(a) shows only the downlink data transmission of the AP to the STA, and after the resource allocation information, the STA transmits the CTS frame 430, the CTS frame 431, and the CTS frame 432 in the subchannel 420, the subchannel 421, and the subchannel 422, respectively.
  • the CTS frame 430, CTS frame 431, and CTS frame 432 transmitted in different subchannels are identical, including the same duration 440.
  • the data transmission from the AP to the STA can be protected according to the duration.
  • the transmission channel 411 of a certain STA covers a part of the subchannel 420, and also covers all of the two subchannels.
  • the two subchannels that are completely covered are the subchannel 421 and the subchannel 423, respectively.
  • the STA transmits a CTS frame. There is only STA-to-AP data transmission between the STA and the AP, but there is an instant confirmation message from the AP to the STA.
  • the STA transmits the CTS frame 430, the CTS frame 431, and the CTS frame 432 in the subchannel 420, the subchannel 421, and the subchannel 422, respectively, and the CTS frame 430 and the CTS frame transmitted in different subchannels.
  • 431 is the same as CTS frame 432 and contains the same duration 441.
  • a CTS frame is transmitted in each subchannel, and the CTS frame includes a duration, and the data transmitted by the AP to the STA can be protected in each subchannel.
  • FIG. 4(a) and FIG. 4(b) are only for explaining the location where the CTS frame is transmitted, and do not relate to the case where there are multiple STAs in the subchannel transmitting CTS frames.
  • the station sends the transmission protection message in the current overlapping subchannel, including:
  • the station After the uplink data of the access point is sent, the station is separated by a preset duration, and the transmission protection message is sent in the current overlapping subchannel;
  • step 105 if the current overlapping subchannel is further configured to send a transmission protection message to another station, the station sends the transmission protection message in the current overlapping subchannel according to a preset rule, including:
  • the station After the uplink data of the access point is sent, the station is separated by a preset duration, and the transmission protection message is sent in the current overlapping subchannel according to a preset rule.
  • the AP needs to protect the AP to the STA.
  • the transmission protection message sent by the STA can be sequenced. After the uplink data transmission from the STA to the AP, it is used to protect the transmission of the AP to the STA's instant acknowledgement message.
  • the transmission protection message sent by the STA is after the resource allocation information.
  • the third embodiment only STA to AP data transmission between the STA and the AP is performed, but there is an instant confirmation message from the AP to the STA.
  • the transmission protection message sent by the STA may be as shown in FIG. 4(b), and may be located after the resource allocation information in the timing, or may be used after the uplink data transmission of the STA to the AP in the sequence, as shown in FIG. Protects the transmission of instant confirmation messages from AP to STA.
  • FIG. 5 is a schematic diagram of a STA transmitting a CTS frame according to an embodiment of the present invention.
  • the overlapping of a subchannel and a STA's transmission channel is as shown in FIG. 4(a) and FIG. 4(b). It is shown that there is only STA-to-AP data transmission between the STA and the AP, but there is an instant confirmation message from the AP to the STA.
  • the CTS frames 530, 531, 532 sent by the STA are located after the uplink data transmission of the STA to the AP, and the CTS frames 530, 531, 532 contain the same duration 540.
  • step 105 the station sends the transmission protection message in the current overlapping subchannel according to a preset rule, including:
  • the ordering is used to determine an order in which the plurality of stations send a transmission protection message in the current overlapping subchannel, the plurality of stations including the Site
  • the sorting rule is a preset sorting rule or a sorting rule indicated in the resource allocation information.
  • the preset collation may include:
  • FIG. 6 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • the transmission protection message is a CTS frame, and the CTS frame is sent after receiving the resource allocation information.
  • a certain subchannel 610 covers a transmission channel of a plurality of STAs, and covers a part of the transmission channel 620 of STA1, covering all of the transmission channels 621 and 622 of STA2 and STA3, and three of them.
  • the IDs of the STAs are 1, 2, and 3, respectively, and the corresponding transport channels are 620, 621, and 622, respectively.
  • the transmission channel 620 of STA1 also covers a portion of subchannel 611.
  • the sending rule is that the site IDs are sorted from small to large.
  • the STA1 obtains the IDs of the plurality of STAs of the sub-channel coverage 610 from the resource allocation information, which are 1, 2, and 3, respectively. After sorting from small to large, it is learned that the STA first transmits the CTS frame.
  • the inter-frame spacing of each frame on the channel may be preset.
  • the first CTS frame is sent at a preset time T1 after receiving the resource allocation information, and the second CTS frame is in the The T1 time interval is transmitted at the time T2 of the time interval a, and the third CTS frame is transmitted at the time T3 which is the time interval of the time T2 from the time T2. Therefore, by knowing the order in which the STA transmits the CTS frame, the time at which the CTS frame is transmitted can be known.
  • the preset duration may be a short frame interframe space, and the a duration may also be a short frame interframe interval plus a CTS transmission duration.
  • the duration of the short frame interframe space is given by the protocol.
  • the frame carrying the transmission protection message is usually of fixed length and is transmitted using a specific modulation and coding scheme, so the transmission duration is fixed.
  • the CTS frame is transmitted on the 20 MHz subchannel using the lowest order modulation coding method, and the required transmission duration is 44 microseconds.
  • STA1 transmits a CTS frame 630 at time T1.
  • STA2 sends a CTS frame 631 at time T2.
  • STA3 transmits a CTS frame 632 at time T3.
  • the CTS frame 630 includes a duration 640
  • the CTS frame 631 includes a duration 641
  • the CTS frame 640 includes a duration 641.
  • Transmission protection solves the problem of how multiple STAs transmit CTS frames for transmission protection when multiple STAs are scheduled by the same AP, and protects downlink data transmission from subsequent APs to multiple STAs, improving the reliability of transmission.
  • sending a transmission protection message in the current overlapping subchannel according to the preset rule may include:
  • the second sending moment is a moment for transmitting a transmission protection message, and each of the stations transmitting the transmission protection message on the current overlapping subchannel corresponds to one of the second sending moments.
  • FIG. 7 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention.
  • the transmission protection message is a CTS frame.
  • a certain subchannel 710 covers a transmission channel of a plurality of STAs, and the plurality of STAs are STA1, STA2, and STA3, respectively, and the plurality of transmission channels covered are 720, 721, and 722, respectively.
  • the resource allocation information sent by the AP to each STA may include a sending sequence indicating that the STA sends the CTS frame.
  • the transmission order specified by the AP is STA1, STA2, and STA3.
  • the interval at which the CTS frame is sent is set in advance.
  • the first CTS frame is transmitted at the time T1 of the preset time interval after receiving the resource allocation information, and the interval B of the CTS frame sent after the second CTS frame is transmitted.
  • the T2 time is transmitted, and the third CTS frame is transmitted at the time T3 of the interval b after the end of the transmission of the CTS frame transmitted at the time T2. Therefore, by knowing the order in which the STA transmits the CTS frame, the time at which the CTS frame is transmitted can be known.
  • Both the preset duration and the b duration can be short frame interframe spaces.
  • STA1 transmits a CTS frame 730 at time T1
  • STA2 transmits a CTS frame 731 at time T2
  • STA3 transmits a CTS frame 732 at time T3.
  • the CTS frame 730 includes a duration 740
  • the CTS frame 731 includes a duration 731
  • the CTS frame 740 includes a duration 741.
  • the downlink data sent by different STAs is protected by different durations.
  • the AP may also directly specify the time when each STA sends a CTS frame, for example, when STA1 is specified at T1.
  • the CTS frame is transmitted, STA2 transmits a CTS frame at time T2, and STA3 transmits a CTS frame at time T3.
  • the AP specifies the order in which the STA sends the CTS frame or the second sending time that the STA sends the transmission protection message, which prevents the STA from receiving excessive redundant information, such as the sending time of other STAs.
  • the problem of how to send a CTS frame when the STA cannot receive all the STA scheduling information is solved, and the data that the AP subsequently sends to multiple STAs can be protected, thereby improving the reliability of data transmission.
  • FIG. 8 is a schematic diagram of a STA transmitting a transmission protection message according to an embodiment of the present invention.
  • an uplink data transmission sent by an STA to an AP, and an instant confirmation message sent by the AP to the STA are only required.
  • the instant confirmation message of the AP to the STA is protected.
  • the STA may send the CTS frame after the STA transmits the uplink data transmission to the AP.
  • the time at which each STA sends a CTS frame may be determined according to the uplink transmission window duration of the station and the specified transmission protection message sending sequence. For example, the first STA sends the uplink data to the AP after the preset time interval T1′. In the CTS frame, the second STA transmits the CTS frame at the time T2' of the interval c after the CTS frame transmitted at the time T1' is transmitted.
  • the preset duration and the c duration may be short frame interframe spaces.
  • An embodiment of the present invention further provides a method for protecting data transmission. As shown in FIG. 16, the method includes:
  • Step 1601 The station receives resource allocation information sent by the access point, where the resource allocation information includes a transport channel allocated by the access point to the station, where the transport channel is allocated by the access point to the site. frequency band;
  • Step 1602 the station acquires at least one overlapping subchannel for transmitting, by the station, a transmission protection message according to the condition that the allocated transmission channel and the multiple subchannels overlap each other, the access point and the site
  • the working frequency band is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel of the station;
  • Step 1603 Send the transmission protection message in the at least one overlapping subchannel.
  • the current overlapping subchannel for transmitting the transmission protection message by the station is also used by other stations to send a transmission protection message, multiple stations transmitting the transmission protection message in the current overlapping subchannel are simultaneously transmitted in the current overlapping subchannel. Transmitting a protection message, the plurality of sites including the site;
  • the transmission protection messages sent at the same time are the same;
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transport channel.
  • bandwidths of the multiple subchannels may be equal.
  • the transmission protection message may be a clear CTS frame, or an ACK frame.
  • step 1603 transmitting a transmission protection message in the at least one overlapping subchannel, including:
  • the transmission protection message After transmitting the uplink data transmission to the access point, the transmission protection message is sent at an interval preset duration.
  • step 1603 transmitting a transmission protection message in the at least one overlapping subchannel, including:
  • the third sending moment is a time allocated by the access point to the station for the station to send the transmission protection message.
  • the transmission protection message sent at the same time is the same, and may include:
  • the transmission protection message transmitted at the same time is scrambled by the same scrambling code sequence
  • the transmission protection message sent at the same time adopts the same modulation and coding mode
  • the MAC layer content of the transmission protection message sent at the same time is the same.
  • a simple implementation is to use the same scrambling generator initial state value for multiple sites.
  • multiple sites use the same predefined scrambling code generator initial state value, or use the same scrambling code sequence as the frame carrying the resource allocation information, or adopt a sequence based on the same rule from the AP identity mapping, or adopt the same based
  • the duration that is carried in the frame carrying the resource allocation information since the current duration is Between, or the duration that will be carried in the CTS frame.
  • the MAC layer content may be the same: the transmission protection message includes the same RA domain value, and the duration of the inclusion is the same.
  • the RA domain is the address of the AP.
  • the preset duration can be a short frame interframe space.
  • the modulation and coding method includes two aspects of a modulation mode and a channel coding scheme.
  • a preferred modulation and coding method is that the modulation method uses BPSK (Binary Phase Shift Keying), and the channel coding scheme uses a BCC (Binary Convolutional Code) with a code rate of 1/2.
  • FIG. 9 is a schematic diagram of a STA transmitting a transmission protection message according to an embodiment of the present invention.
  • the transmission protection message is a CTS frame
  • a certain sub-channel 910 covers a transmission channel of multiple STAs
  • the plurality of STAs are STA1, STA2, and STA3, respectively
  • the plurality of transmission channels covered are 920. 921 and 922.
  • Subchannel 911 covers the transmission channels of STA4 and STA5.
  • STA1, STA2, and STA3 After receiving the resource allocation information, STA1, STA2, and STA3 transmit the CTS frame 830 at an interval preset time.
  • the preset inter-frame interval time is also the same. Therefore, the times at which the multiple STAs send the CTS frame are also the same, that is, multiple STAs simultaneously transmit the CTS frame.
  • CTS frame 830 is the result of a plurality of identical CTS frame overlays.
  • the third transmission time may also be specified in the resource allocation information, so that the STA transmits the CTS frame at the third transmission time after receiving the resource allocation information.
  • the frame MAC layer content of the transmission protection message sent by the multiple stations in the overlapping subchannel is the same, and the same scrambling code sequence is used. Perform scrambling.
  • a scrambling code generator initial state (7-bit sequence) value is randomly selected to generate a scrambling code sequence, and then the data is scrambled using the scrambling code sequence. This will result in even though the contents of the two CTS frames are identical, but may be completely different in the physical waveform, because the initial value of the scrambling code generator randomly selected by the STA is different, resulting in a different scrambling sequence, and the result after scrambling the same data It is also different.
  • all the STAs whose transmission channels are covered by the same subchannel use the same scrambling code generator initial state value.
  • all STAs use the same scrambling code generator initial state value as the resource allocation information.
  • the resource allocation information may be an NDP frame, that is, there is no Data part, and there is no scrambling code generator initial state value, these STAs may also select other values as the initial state value of the scrambling code generator that generates the CTS by itself, for example:
  • the AP explicitly indicates the initial state value of the 7-bit scrambling code generator in the trigger frame
  • Use 7-bit in the MAC address of the AP for example, the lowest 7-bit
  • the 7-bit in the CRC of the trigger frame HEW-SIG-A or HEW-SIG-B is used.
  • CTSs in different subchannels need to use the same scrambling code sequence, and CTSs in different subchannels may use different scrambling code sequences.
  • the CTS on the two subchannels 910 and 911 in Figure 9 may use different scrambling code sequences.
  • the subcarrier phase on each subchannel may be accompanied by different degrees of phase rotation, so as to reduce the peak-to-average power ratio of the time domain signal, which is convenient for other devices to receive.
  • the transmission of the CTS in the present invention should also comply with the rule that the STA determines the phase rotation of each subchannel according to a predetermined rule for each subchannel included in the total bandwidth scheduled by the AP, and uses the phase rotation when transmitting the CTS. Since multiple STAs follow the same phase rotation rule, multiple CTS phases on the same subchannel rotate in the same phase, and their superimposed signals are still decodable.
  • multiple STAs simultaneously send CTS frames, which can reduce system overhead and reduce interference.
  • the embodiments of the present invention provide various specific implementation manners. In an actual application, which specific implementation manner is adopted at the time of initialization, it is not necessary to indicate which manner is adopted during operation.
  • the STA sends a CTS frame after receiving the resource allocation information.
  • the CTS frame is sent after the uplink data transmission to the AP.
  • the method may further include:
  • the station obtains transmission protection indication information from the resource allocation information, where the transmission protection indication information indicates whether the station sends a transmission protection message, or indicates whether the station is allowed to send a transmission protection message;
  • the resource allocation information may carry indication information of whether to use transmission protection. This embodiment can be used in all embodiments of the present invention.
  • the indication information schemes carried in the resource allocation information that need to use the transmission protection message may be as follows:
  • the AP uses a 1-bit indication in the resource allocation information.
  • the meaning of the indication is that all scheduled STAs either use transmission protection or are not used.
  • the AP indicates in the resource allocation information whether each STA uses transmission protection, for example, a bit table can be used for indication.
  • the second solution requires more overhead, but is more flexible, which can effectively reduce the number of CTS and reduce the impact of delay spread.
  • the resource allocation information sent by the AP does not explicitly indicate whether transmission protection is required, and each STA decides whether to use transmission protection according to its own situation. This scheme is only applicable to the case where CTS is simultaneously transmitted.
  • a specific implementation method is: after the AP sends the resource allocation information, if the CTS frame sent by the STA is received in the Point Coordination Function Interframe Space (PIFS) or the channel is busy, the AP is considered to have at least one The STA needs transmission protection.
  • the AP will start transmitting data at the time when the Trigger frame transmission end interval is 2 SIFS plus 1 CTS transmission time. Otherwise (the AP detects that the channel is always idle during the PIFS time), it will be in the Trigger frame transmission end interval. Data transfer begins at the moment of PIFS time. From the perspective of the STA, if transmission protection is required, the CTS is transmitted at the time of the SIFS interval after receiving the resource allocation information.
  • PIFS is greater than SIFS.
  • the time start time can also be the starting point of the above data end.
  • the AP uses a 1-bit indication in the resource allocation information, which means that transmission protection is allowed, but each STA decides whether to use transmission protection according to its own situation; or does not allow transmission protection.
  • a specific implementation method is: when the indication location is 0, the scheduled STA does not allow transmission protection; when the indication location is 1, after the AP sends the resource allocation information, if the PIFS (Point Coordination Function Interframe Space) If the CTS frame sent by the STA is received or the channel is busy, the AP considers that at least one STA needs transmission protection. The AP will start transmitting data at the time when the Trigger frame transmission interval is 2 SIFS plus 1 CTS transmission time. Otherwise (the AP detects that the channel is always idle during the PIFS time), the data transmission will start at the time when the Trigger frame transmission end interval PIFS time.
  • PIFS Coordinating Function Interframe Space
  • the CTS is transmitted at the time of the SIFS interval after receiving the resource allocation information.
  • PIFS is greater than SIFS.
  • the time start time can also be the starting point of the above data end.
  • the AP implicitly indicates whether to perform transmission protection through the Trigger frame. This method usually requires multiplexing some of the existing fields of the Trigger frame, and the final effect is similar to the first or fourth scheme.
  • a specific implementation method is: when the LENGTH field in the L-SIG (Legacy SIGNAL) field of the Trigger frame is set to 0, it indicates that the AP is allowed to be The scheduled STA performs transmission protection; when the value of the LENGTH field in the L-SIG domain of the Trigger frame is greater than 0, it indicates that the AP does not allow the scheduled STA to use transmission protection.
  • L-SIG Legacy SIGNAL
  • Whether or not to perform transmission protection according to whether or not to use the transmission protection indication information can avoid excessive protection and save system resources.
  • the embodiment of the invention further provides a method for protecting data transmission, the method comprising:
  • the access point sends the resource allocation information, where the resource allocation information includes the transmission channel information allocated to the at least two sites, so that the station that receives the resource allocation information acquires the site for sending according to the resource allocation information. Transmitting at least one overlapping subchannel of the protection message and transmitting a transmission protection message in each of the at least one overlapping subchannel;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping with a transmission channel of the station;
  • the transmission protection message is used to protect the number of downlinks of the access point to the station that sends the transmission protection message
  • the transmission protection message includes a duration, the duration being used to indicate an exclusive time of the transmission of the transmission protection message to the station to which the transmission protection message is allocated.
  • the interval is The second time length transmits downlink data
  • the resource allocation information is sent, if the working frequency band is detected to be idle within the first time period, after the resource allocation information is sent, the downlink data is transmitted for a third time interval.
  • the station after receiving the uplink data sent by the station, if the transmission protection message sent by the station is received within the first time period or the working frequency band is detected to be busy, after the foregoing data reception ends, Transmitting downlink data at a second interval;
  • the downlink data After receiving the uplink data sent by the station, if it is detected that the working frequency band is idle within the first time period, after the data receiving is ended, the downlink data is transmitted for a third time interval.
  • the first duration may be a duration of a distributed interframe interval
  • the second duration may be a sum of a duration of two short frame intervals and a transmission duration of a transmission protection message, and a third duration The length of time during which the interframe space can be distributed
  • the duration of the distributed interframe space is greater than the duration of the short frame interval.
  • the first duration may be a duration of an interframe interval of the point coordination function
  • the second duration may be a sum of a duration of two short frame intervals and a transmission duration of a transmission protection message
  • a third The duration can be the duration of the inter-frame spacing of the point coordination function
  • the duration of the inter-frame spacing of the point coordination function is greater than the duration of the short frame interval.
  • the embodiment of the invention further provides a method for protecting data transmission, the method comprising:
  • the access point sends the resource allocation information, where the resource allocation information includes the transmission channel information allocated to the at least two sites, so that the station that receives the resource allocation information acquires the site for sending according to the resource allocation information. Transmitting at least one overlapping subchannel of the protection message and transmitting a transmission protection message in each of the at least one overlapping subchannel;
  • At least two stations in the current overlapping subchannel send a transmission protection message
  • the at least two stations simultaneously send a transmission protection message, where the simultaneously transmitted transmission protection message is the same;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping sub A channel is a subchannel that overlaps a transmission channel of the station;
  • the transmission protection message is used to protect downlink data of the access point to the station, where the transmission protection message includes a duration, where the duration is used to indicate that the station is to be allocated to the station.
  • the exclusive time of the channel is used to protect downlink data of the access point to the station.
  • FIG. 10 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • a channel is divided into multiple inherent subchannels, each of which has a bandwidth of 20 MHz, and only a partial subchannel is shown in FIG.
  • the channel there are downlink data transmission from the AP to the STA, uplink data transmission from the STA to the AP, and an instant confirmation message from the AP to the STA, and the CTS frames in each subchannel are sequentially transmitted.
  • the uplink data includes data that the STA1 and the STA2 respectively transmit to the AP
  • the downlink data includes data that the AP transmits to the STA1 and the STA3, respectively. Since the AP needs to feed back the instant confirmation message to the STA, STA1, STA2, and STA3 all need to send a CTS frame.
  • the subchannel 1010 needs to sequentially transmit CTS1, CTS2, and CTS3 respectively sent by STA1, STA2, and STA3.
  • CTS3, CTS4, CTS5, and CTS6 respectively sent by STA3, STA4, STA5, and STA6 need to be transmitted.
  • FIG. 11 is a schematic diagram of an application scenario according to an embodiment of the present invention. As shown in FIG. 11, the channel is divided into multiple subchannels, each subchannel bandwidth is 20 MHz, and only a partial subchannel is shown in FIG. In the channel, there are AP to STA downlink data transmission, STA to AP uplink data transmission, and AP to STA instant confirmation message, and CTS frames in each subchannel are simultaneously transmitted.
  • the uplink data includes data that is respectively transmitted by the STA1 and the STA2 to the AP
  • the downlink data includes data that the AP transmits to the STA1 and the STA3, respectively. Since the instant confirmation message needs to be fed back, STA1, STA2, and STA3 all need to send a CTS frame, and each STA simultaneously transmits a CTS frame.
  • the CTS 123 is formed by superimposing CTS frames transmitted by STA1, STA2, and STA3.
  • the CTS 3456 is formed by superimposing CTS frames transmitted by STA3, STA4, STA5, and STA6.
  • the transmission protection method of the present invention is applicable not only to OFDMA but also to MU MIMO systems.
  • the transmission protection message is a CTS frame.
  • FIG. 12 is a schematic diagram of a STA sending a transmission protection message according to an embodiment of the present invention, and the application scenario shown in FIG. 11 is a MU MIMO system.
  • resource allocation information schedules MIMO transmissions of a plurality of STAs.
  • each STA receives data on the same frequency band, so the transmission of data protection frames should also cover the entire bandwidth.
  • the scheduled STA1, STA2, STA3, and STA4 transmit a transmission protection message in each subchannel of the entire transmission channel, and a plurality of STAs may be sorted according to a transmission rule, or may be specified by an AP.
  • STA1, STA2, STA3, and STA4 sequentially transmit CTS1, CTS2, CTS3, and CTS4 in each subchannel.
  • FIG. 13 is a schematic diagram of a STA transmitting a transmission protection message according to an embodiment of the present invention. As shown in FIG. 13, STA1, STA2, STA3, and STA4 simultaneously transmit CTS 1234 in each subchannel.
  • the transmission protection method in the embodiment of the present invention can also implement transmission protection in the MU MIMO system.
  • the embodiment of the present invention provides a STA, which is used by the STA to perform the function performed by the STA in the method for protecting data transmission provided by any one of the embodiments in which the foregoing STA sends the transmission protection message.
  • the STA includes a receiver 1401, a processor 1402, and a transmitter 1403.
  • the processor may be one or more. This embodiment is exemplified by one embodiment. Where other processors are involved in the processor, reference may be made here. understanding);
  • a receiver 1401 configured to receive resource allocation information sent by an access point, where the resource allocation information includes a transmission channel allocated by the access point to the station, where the transmission channel is allocated by the access point to the The frequency band of the station;
  • the processor 1402 is configured to acquire, according to the condition that the allocated transmission channel and the plurality of subchannels overlap each other, at least one overlapping subchannel for transmitting, by the station, a transmission protection message, the access point and the site
  • the working frequency band is divided into a plurality of subchannels, the overlapping subchannels being subchannels overlapping the transmission channel of the station;
  • the processor 1402 is further configured to determine whether each of the at least one overlapping subchannel for transmitting the transmission protection message by the station is only for the station to send the transmission protection message;
  • the transmitter 1403 is configured to: if the current overlapping subchannel only sends a transmission protection message to the station, Transmitting the transmission protection message in the overlapping subchannel;
  • the transmitter 1403 is further configured to send, according to a preset rule, the transmission protection message in the current overlapping subchannel if the current overlapping subchannel is further configured to send a transmission protection message to another station;
  • the multiple stations transmitting the transmission protection message in the current overlapping subchannel sequentially send the transmission protection in the current overlapping subchannel.
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transmission channel.
  • the transmitter 1403 is further configured to: after receiving the resource allocation information, send the transmission protection message in the current overlapping subchannel by using a preset duration;
  • the transmitter 1403 is further configured to: after receiving the resource allocation information, interval preset durations, and send the transmission protection message in the current overlapping subchannel according to a preset rule.
  • the transmitter 1403 is further configured to send the transmission protection message in the current overlapping subchannel after the uplink data to the access point is sent, by using a preset duration.
  • the transmitter 1403 is further configured to: after the uplink data to the access point is sent, be separated by a preset duration, and send the transmission protection message in the current overlapping subchannel according to a preset rule.
  • Embodiments of the present invention provide a site.
  • Embodiments of the present invention provide a site, which can protect data transmission from the access point to the site, so that other third-party sites can maintain the duration according to the transmission protection message.
  • the duration of the data is set to avoid the time and frequency band that the AP needs to perform data transmission, thereby protecting the data transmission sent by the AP to the STA, thereby improving the reliability of data transmission.
  • the embodiment of the present invention further provides a STA, which is used to perform the function performed by the STA in the method for protecting data transmission provided by any one of the embodiments in which the foregoing STA sends a transmission protection message.
  • the STA includes:
  • a receiver configured to receive resource allocation information sent by an access point, where the resource allocation information includes a transmission channel allocated by the access point to the station, where the transmission channel is allocated by the access point to the site Frequency band
  • a processor configured to acquire, according to the condition that the allocated transmission channel and the plurality of subchannels overlap each other Transmitting at least one overlapping subchannel of the transmission protection message, the working frequency band between the access point and the station is divided into a plurality of subchannels, and the overlapping subchannel is intersected with a transmission channel of the station Stacked subchannels;
  • a transmitter configured to send the transmission protection message in the at least one overlapping subchannel
  • the current overlapping subchannel for transmitting the transmission protection message by the station is also used by other stations to send a transmission protection message, multiple stations transmitting the transmission protection message in the current overlapping subchannel are simultaneously transmitted in the current overlapping subchannel. Transmitting a protection message, the plurality of sites including the site;
  • the transmission protection messages sent at the same time are the same;
  • the transmission protection message is used to protect transmission of downlink data of the access point to the site, where the transmission protection message includes a duration, where the duration is used to indicate that the site pair is assigned to the site The exclusive time of the transport channel.
  • Embodiments of the present invention provide a site, which can protect data transmission from the access point to the site, so that other third-party sites set their own duration according to the duration in the transmission protection message, thereby avoiding the AP.
  • the time and frequency band for data transmission by the STA are required to protect the data transmission sent by the AP to the STA, thereby improving the reliability of data transmission.
  • the embodiment of the present invention provides an AP, where the AP is configured to perform the function performed by the AP in the method for protecting data transmission provided by any one of the foregoing embodiments.
  • the AP includes a receiver 1501, a processor 1502, and a transmitter 1503;
  • the processor 1502 is configured to generate resource allocation information.
  • the transmitter 1503 is configured to send resource allocation information, where the resource allocation information includes transport channel information allocated to the at least two sites, so that the station that receives the resource allocation information acquires the used information according to the resource allocation information. Transmitting, by the station, at least one overlapping subchannel of the transmission protection message, and transmitting a transmission protection message in each of the at least one overlapping subchannel;
  • the receiver 1501 is configured to: if at least two stations in the current overlapping subchannel send a transmission protection message, receive the at least two stations to sequentially send a transmission protection message;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannel is a subchannel overlapping with a transmission channel of the station;
  • the transmission protection message is used to protect downlink data of the access point to a station that sends the transmission protection message, where the transmission protection message includes a duration, where the duration is used to indicate that the transmission protection is sent Message The exclusive time of the station to the transport channel assigned to it.
  • the transmitter 1503 is further configured to: after the resource allocation information is sent, if the access point receives the transmission protection message sent by the station within the first time period or detects that the working frequency band is busy, then the resource is in the resource After the transmission of the distribution information ends, the downlink data of the second time duration is sent to the station;
  • the transmitter 1503 is further configured to: after the resource allocation information is sent, if the working frequency band is idle within the first time period, after the resource allocation information is sent, the downlink data sent to the station is sent for a third time interval. .
  • the receiver 1501 is further configured to: after sending the resource allocation information, receive the uplink data sent by the station;
  • the transmitter 1503 is further configured to: after receiving the uplink data, if receiving the transmission protection message sent by the station or detecting that the working frequency band is busy within the first time period, after the uplink data reception ends, Transmitting downlink data at a second interval;
  • the transmitter 1503 is further configured to: after receiving the uplink data sent by the station, if the working frequency band is detected to be idle within the first time period, after the data receiving is ended, the downlink data is transmitted at a third time interval.
  • Embodiments of the present invention provide an access point, which can protect data transmission from the access point to the site, so that other third-party stations set their own duration according to the duration in the transmission protection message, thereby avoiding The AP and the STA need to perform data transmission time and frequency band, thereby protecting the data transmission sent by the AP to the STA, thereby improving the reliability of data transmission.
  • the embodiment of the present invention provides an AP, where the AP is configured to perform the function performed by the AP in the method for protecting data transmission provided by any one of the foregoing embodiments, where the AP includes:
  • a processor configured to generate resource allocation information
  • a transmitter configured to send resource allocation information, where the resource allocation information includes transport channel information allocated to at least two stations, so that a station that receives the resource allocation information acquires according to the resource allocation information Transmitting, by the station, at least one overlapping subchannel of the transmission protection message, and transmitting a transmission protection message in each of the at least one overlapping subchannel;
  • a receiver configured to: if at least two stations in the current overlapping subchannel send a transmission protection message, receive the at least two stations to simultaneously send a transmission protection message, where the simultaneously transmitted transmission protection message is the same;
  • the working frequency band between the access point and the station is divided into multiple subchannels, and the overlapping subchannels are Is a subchannel that overlaps with a transmission channel of the station;
  • the transmission protection message is used to protect downlink data of the access point to the station, where the transmission protection message includes a duration, where the duration is used to indicate that the station is to be allocated to the station.
  • the exclusive time of the channel is used to protect downlink data of the access point to the station.
  • the transmitter is further configured to: after the resource allocation information is sent, if the access point receives the transmission protection message sent by the station within the first time period or detects that the working frequency band is busy, then the resource allocation After the information is sent, the second time interval is sent to the downlink data of the station;
  • the transmitter is further configured to: after the resource allocation information is sent, if the working frequency band is idle within the first time period, after the resource allocation information is sent, the downlink data is sent to the station at a third time interval.
  • the receiver is further configured to: after sending the resource allocation information, receive the uplink data sent by the station;
  • the transmitter is further configured to: after receiving the uplink data, if the transmission protection message sent by the station is received within the first time period or the working frequency band is detected to be busy, after the uplink data reception ends, the interval is The second time length transmits downlink data;
  • the transmitter is further configured to: after receiving the uplink data sent by the station, if it is detected that the working frequency band is idle within the first time period, after the data receiving is ended, the downlink data is transmitted at a third time interval.
  • Embodiments of the present invention provide an access point, which can protect data transmission from the access point to the site, so that other third-party stations set their own duration according to the duration in the transmission protection message, thereby avoiding The AP and the STA need to perform data transmission time and frequency band, thereby protecting the data transmission sent by the AP to the STA, thereby improving the reliability of data transmission.
  • An embodiment of the present invention provides a method and apparatus for protecting data transmission, and a site, an access point, and a site receives resource allocation information sent by an access point, where the resource allocation information includes the access point allocated to the access point.
  • a transmission channel of the station where the station acquires at least one overlapping subchannel for transmitting, by the station, a transmission protection message according to the condition that the allocated transmission channel and the plurality of subchannels overlap each other, and in the at least one intersection
  • Transmitting a transmission protection message in the overlay sub-channel the transmission protection message includes a duration, the duration indicating an exclusive time of the station to the transmission channel allocated to the station, so that the data transmission of the access point to the station is protected, Having other third-party stations set their own duration according to the duration in the transmission protection message, thereby avoiding the time and frequency band that the AP needs to perform data transmission, and then performing data transmission to the STA for the AP. Protection improves the reliability of data transmission.
  • the transport channel indicated by the channel resource allocated by the access point to the station and included in the resource allocation information may be a data transmission channel for the station to subsequently use for data transmission, for example, in a minimum unit of 2 MHz.
  • An allocated data transmission channel in which case the station needs to de-assert one or more overlapping subchannels for transmitting transmission protection messages (such as CTS frames) according to the data transmission channel, for example, data One or more 20 MHz channels on which the transmission channel is located; the transmission channel indicated by the channel resource allocated by the access point to be included in the resource allocation information of the station, or may be a subchannel designated by the AP for transmitting the transmission protection message, That is, the transmission channel is indicated by the subchannel width as a minimum unit.
  • the AP instructs the station to transmit a transmission protection message on a 40 MHz channel, and the station simultaneously transmits a transmission protection message on the two 20 MHz subchannels included in the 40 MHz channel.
  • the invention may be described in the general context of computer-executable instructions executed by a computer, such as a program module.
  • program modules include routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types.
  • the invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are connected through a communication network.
  • program modules can be located in both local and remote computer storage media including storage devices.

Abstract

本发明实施例提供了一种用于对数据传输进行保护的方法和装置,所述方法包括:站点接收接入点发送的资源分配信息,根据分配的传输信道以及多个子信道相互交叠的状况,获取用于站点发送传输保护消息的至少一个交叠子信道,并根据用于站点发送传输保护消息的至少一个交叠子信道中的每一个交叠子信道是否仅供所述站点发送所述传输保护消息的状况,在当前交叠子信道中发送所述传输保护消息;所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。本发明能对接入点至站点的数据传输进行保护。

Description

用于对数据传输进行保护的方法、装置及站点、接入点 技术领域
本发明涉及通讯领域,特别涉及一种用于对数据传输进行保护的方法、装置及站点、接入点。
背景技术
随着通讯技术的发展,WiFi技术也演进到了系统容量更高的下一代WiFi HEW(High Efficiency WLAN,高效无线局域网)技术,主要考虑AP(Access Point,接入点)和STA(Station,站点)密集分布的场景。在下一代WiFi HEW场景下,采用基于调度的OFDMA(Orthogonal Frequency Division Multiple Access,正交频分复用)数据传输机制或MU MIMO(Multi-User Multiple-Input Multiple-Output,多用户多入多出技术)。在OFDMA系统中,AP同时调度多个STA在不同子信道上的数据传输,在MU MIMO系统中,多个STA在相同频带上接收数据,上述两种系统都可以有效提高频谱效率和系统吞吐量。
基本的OFDMA数据传输机制的过程包括,AP发送触发(Trigger)帧,其中包含多个STA的资源调度信息,被调度的STA根据Trigger帧中的资源调度信息在相应时间和频带与AP交互数据。在WiFi HEW的AP和STA都高密度分布场景下,由于OBSS(Overlapping Basic Service Set,重叠基本服务集)大量存在,数据传输的过程需要避免数据传输之间的相互干扰,以保证传输的可靠性。
传统的数据传输保护方法是RTS/CTS(Request to Send/Clear to Send,请求发送/清除发送)机制。具体过程包括,数据发送方向数据接收方发送RTS帧,其中携带数据发送方根据已知的数据传输量计算得到的持续时间。当数据接收方正确接收RTS帧之后,向数据发送方回复CTS帧,其中携带持续时间。CTS帧中携带的持续时间是在RTS帧中携带的持续时间的基础上减去CTS帧的发送占据的时长以及两个SIFS(Short Inte-frame Space,短帧间间隔)后的值。由于无线信道的广播特性,CTS帧可被其它WiFi设备接收到。这些WiFi设备将根据CTS帧中携带的持续时间设置自己的NAV(Network Allocation Vector,网络分配矢量),即设置一个倒数的计时器。在NAV减为0之前,WiFi设备不会主动发起数据传输,从而避免了对正在进行的数据传输造 成干扰。显然,CTS帧中所携带的持续时间相当于预留了一段用于数据传输的独占时间,是对后续数据传输的一种保护,从而CTS帧中所携带的持续时间可以称之为一种保护数据传输的信息,即传输保护消息。
在WiFi HEW中,由于OFDMA机制的引入,STA的发送信道和接收信道完全由AP决定,数据传输保护将变得较为复杂。
对于从AP至STA的下行传输,由于STA事先并不知道AP会在哪个信道上向自己发送数据,因此也无法提前通过类似发送CTS帧的方式对AP至STA的数据传输进行保护。
另一方面,旧有设备(Legacy Device)支持的协议中,传输信道被固定划分为多个子信道,每个子信道的带宽为20MHZ。在旧有设备支持的协议中,CTS帧占用的带宽是20MHZ,即,如果传输信道被固定划分为N个子信道,则在同一时刻该传输信道中最多只能传输N个CTS帧。而在OFDMA系统中,为了更加有效地调度资源,被划分的最小频带的宽度可能小于传统设备的子信道,这导致旧有设备无法正确接收HEW帧。
在MU MIMO系统中,也存在类似的问题。可见,现有技术中的数据传输保护方法难以在兼容旧有设备支持协议的情况下,对AP至STA的数据传输进行保护。
发明内容
为了解决接入点至站点之间的数据传输缺乏保护的问题,本发明实施例提供了一种对数据传输进行保护的方法和装置。
第一方面,本发明实施例提供了一种用于对数据传输进行保护的方法,所述方法包括:
站点接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道;
所述站点根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
判断所述用于所述站点发送传输保护消息的至少一个交叠子信道中的每一个交叠子信道是否仅供所述站点发送所述传输保护消息;
若当前交叠子信道仅供所述站点发送传输保护消息,则所述站点在所述当前交叠子信道中发送所述传输保护消息;
若当前交叠子信道还供其他站点发送传输保护消息,则所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息;
其中,若当前交叠子信道还供其他站点发送传输保护消息,则在所述当前交叠子信道中发送传输保护消息的多个站点在所述当前交叠子信道中依次发送所述传输保护消息,所述多个站点包括所述站点;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
在第一方面的第一种可能的实现方式中,所述多个子信道的带宽相等。
结合第一方面,或者第一方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息为清除发送CTS帧,或ACK帧。
结合第一方面,或者第一方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,若当前交叠子信道仅供所述站点发送传输保护消息,所述站点在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在接收到所述资源分配信息后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;
若当前交叠子信道还供其他站点发送传输保护消息,所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在接收到所述资源分配信息后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
结合第一方面,或者第一方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,若当前交叠子信道仅供所述站点发送传输保护消息,所述站点在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在发送完至所述接入点的上行数据之后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;
若当前交叠子信道还供其他站点发送传输保护消息,所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在发送完至所述接入点的上行数据之后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
结合第一方面第三种可能的实现方式以及第四种可能的实现方式中的任意一种可能的实现方式,在第五种可能的实现方式中,所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点根据所述资源分配信息,获取在当前交叠子信道中发送所述传输保护消息的多个站点;
所述站点根据排序规则,对所述多个站点排序,所述排序用于确定所述多个站点在所述当前交叠子信道中发送传输保护消息的顺序,所述多个站点包括所述站点;
所述站点根据所述排序获取所述站点发送传输保护消息的顺序;
所述站点根据所述发送传输保护消息的顺序获取对应的第一发送时刻;
所述站点在当前交叠子信道中,在所述第一发送时刻发送所述传输保护消息;
其中,所述排序规则为预设的排序规则,或所述资源分配信息中指示的排序规则。
结合第一方面第五种可能的实现方式,在第六种可能的实现方式中,所述预设的排序规则包括:
根据站点ID从大到小排序;或
根据站点ID从小到大排序;或
根据站点在所述资源分配信息中的先后顺序排序。
结合第一方面第三种可能的实现方式以及第四种可能的实现方式中的任意一种可能的实现方式,在第七种可能的实现方式中,根据预设规则,在当前交叠子信道中发送传输保护消息,包括:
根据所述资源分配信息中指定的传输保护消息发送顺序或第二发送时刻指示信息获取第二发送时刻;
在所述当前交叠子信道中,在所述第二发送时刻发送所述传输保护消息;
其中,所述第二发送时刻为用于发送传输保护消息的时刻,在所述当前交叠子信道发送传输保护消息的每个站点分别对应一个所述第二发送时刻。
结合第一方面,或者第一方面第一至第七种任意一种可能的实现方式,在第八种可能的实现方式中,在站点接收接入点发送的资源分配信息之后,在获取用于所述站点发送传输保护消息的至少一个交叠子信道之前,所述方法还包括:
所述站点从所述资源分配信息中获取传输保护指示信息,所述传输保护指示信息指示所述站点是否发送传输保护消息,或指示是否允许所述站点发送传输保护消息;
当所述传输保护指示信息指示所述站点发送传输保护消息或指示允许所述站点发送传输保护消息时,获取用于所述站点发送传输保护消息的至少一个交叠子信道。
第二方面,本发明实施例提供了一种用于对数据传输进行保护的方法,所述方法包括:
站点接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道;
所述站点根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述站点的传输信道交叠的子信道;
在所述至少一个交叠子信道中发送所述传输保护消息;
其中,若所述站点发送传输保护消息的当前交叠子信道还供其他站点发送传输保护消息,则在当前交叠子信道中发送传输保护消息的多个站点在当前交叠子信道中同时发送所述传输保护消息,所述多个站点包括所述站点;
所述同时发送的传输保护消息相同;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的所述传输信道的独占时间。
在第二方面的第一种可能的实现方式中,所述多个子信道的带宽相等。
结合第二方面,或者第二方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息为清除发送CTS帧,或ACK帧。
结合第二方面,或者第二方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,在所述至少一个交叠子信道中发送传输保护消息,包括:
在接收到所述资源分配信息之后,间隔预设时长发送所述传输保护消息;或
在发送完至所述接入点的上行数据之后,间隔预设时长发送所述传输保护消息。
结合第二方面,或者第二方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,在所述至少一个交叠子信道中发送传输保护消息,包括:
在接收到所述资源分配信息之后,根据资源分配信息中指定的第三发送时刻,在所述第三发送时刻发送所述传输保护消息;或
在发送完至所述接入点的上行数据之后,根据资源分配信息中指定的第三发送时刻,在所述第三发送时刻发送所述传输保护消息;
其中,所述第三发送时刻为所述接入点为所述站点分配的、用于所述站点发送所述传输保护消息的时刻。
结合第二方面,或者第二方面第一至第四种任意一种可能的实现方式,在第五种可能的实现方式中,所述同时发送的传输保护消息相同,包括:
同时发送的传输保护消息采用相同的扰码序列进行加扰;且
同时发送的传输保护消息采用相同的调制编码方式;且
同时发送的传输保护消息的MAC层内容相同。
结合第二方面,或者第二方面第一至第五种任意一种可能的实现方式,在第六种可能的实现方式中,在站点接收接入点发送的资源分配信息之后,在获取用于所述站点发送传输保护消息的至少一个交叠子信道之前,所述方法还包括:
所述站点从所述资源分配信息中获取传输保护指示信息,所述传输保护指示信息指示所述站点是否发送传输保护消息,或指示是否允许所述站点发送传输保护消息;
当所述传输保护指示信息指示所述站点发送传输保护消息或指示允许所述站点发送传输保护消息时,获取用于所述站点发送传输保护消息的至少一个交叠子信道。
第三方面,本发明实施例提供了一种用于对数据传输进行保护的方法,所述方法包括:
接入点发送资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
若所述当前交叠子信道中至少有两个站点发送传输保护消息,则所述至少两个站点依次发送传输保护消息;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至发送所述传输保护消息的站点的下行数 据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述发送所述传输保护消息的站点对被分配给它的传输信道的独占时间。
在第三方面的第一种可能的实现方式中,所述多个子信道的带宽相等。
结合第三方面,或者第三方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息清除发送CTS帧,或ACK帧。
结合第三方面,或者第三方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则所述接入点在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则所述接入点在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
结合第三方面,或者第三方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,所述接入点在发送完资源分配信息后,所述方法还包括:
所述接入点接收所述站点发送的上行数据;
所述接入点在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述接入点在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
第四方面,本发明实施例提供了一种用于对数据传输进行保护的方法,所述方法包括:
接入点发送资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
若所述当前交叠子信道中至少有两个站点发送传输保护消息,则所述至少两个站点同时发送传输保护消息,所述同时发送的传输保护消息相同;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至所述站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
在第四方面的第一种可能的实现方式中,所述多个子信道的带宽相等。
结合第四方面,或者第四方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息为清除发送CTS帧,或ACK帧。
结合第四方面,或者第四方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则所述接入点在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则所述接入点在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
结合第四方面,或者第四方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,所述接入点在发送完资源分配信息后,所述方法还包括:
所述接入点接收所述站点发送的上行数据;
所述站点在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述接入点在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
结合第四方面第三种可能的实现方式以及第四种可能的实现方式中的任意一种可能的实现方式,在第五种可能的实现方式中,所述第一时长为点协调功能帧间间隔的时长,第二时长为两个短帧间隔的时长与一个传输保护消息的传输时长的总和,第三时长为点协调功能帧间间隔的时长;
其中,点协调功能帧间间隔的时长大于短帧间隔的时长。
结合第四方面、第四方面的第一种可能的实现方式至第五种可能的实现方式中的任意一种可能的实现方式,在第六种可能的实现方式中,所述同时发送的传输保护消息相同,包括:
同时发送的传输保护消息采用相同的扰码序列进行加扰;且
同时发送的传输保护消息采用相同的调制编码方式;且
同时发送的传输保护消息的MAC层内容相同。
第五方面,本发明实施例提供了一种用于对数据传输进行保护的装置,设置于站点,所述装置包括:
第一接收单元,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道;第一交叠子信道获取单元,用于根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
第一判断单元,用于判断所述用于所述站点发送传输保护消息的至少一个交叠子信道中的每一个交叠子信道是否仅供所述站点发送所述传输保护消息;
第一发送单元,用于若当前交叠子信道仅供所述站点发送传输保护消息,则在所述当前交叠子信道中发送所述传输保护消息;
第二发送单元,用于若当前交叠子信道还供其他站点发送传输保护消息,则根据预设规则,在所述当前交叠子信道中发送所述传输保护消息;
其中,若当前交叠子信道还供其他站点发送传输保护消息,则在所述当前交叠子信道中发送传输保护消息的多个站点在所述当前交叠子信道中依次发送所述传输保护消息,所述多个站点包括所述站点;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
在第五方面的第一种可能的实现方式中,所述多个子信道的带宽相等。
结合第五方面,或者第五方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息为清除发送CTS帧,或ACK帧。
结合第五方面,或者第五方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,第一发送单元具体用于:
若当前交叠子信道仅供所述站点发送传输保护消息,则在接收到所述资源分配信息后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;或,
第二发送单元具体用于:
若当前交叠子信道还供其他站点发送传输保护消息,则在接收到所述资源分配信息后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
结合第五方面,或者第五方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,第一发送单元具体用于:
若当前交叠子信道仅供所述站点发送传输保护消息,则在发送完至所述接入点的上行数据之后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;或,
第二发送单元具体用于:
若当前交叠子信道还供其他站点发送传输保护消息,则在发送完至所述接入点的上行数据之后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
结合第五方面第三种可能的实现方式以及第四种可能的实现方式中的任意一种可能的实现方式,在第五种可能的实现方式中,第二发送单元包括:
站点获取子单元,用于根据所述资源分配信息,获取在当前交叠子信道中发送所述传输保护消息的多个站点;
排序子单元,用于根据排序规则,对所述多个站点排序,所述排序用于确定所述多个站点在所述当前交叠子信道中发送传输保护消息的顺序,所述多个站点包括所述站点;
顺序获取子单元,用于根据所述排序获取所述站点发送传输保护消息的顺序;
第一发送时刻获取子单元,用于根据所述发送传输保护消息的顺序获取对应的第一发送时刻;
第一发送子单元,用于在当前交叠子信道中,在所述第一发送时刻发送所述传输保护消息;
其中,所述排序规则为预设的排序规则,或所述资源分配信息中指示的排序规则。
结合第五方面第五种可能的实现方式,在第六种可能的实现方式中,所述预设的排序规则包括:
根据站点ID从大到小排序;或
根据站点ID从小到大排序;或
根据站点在所述资源分配信息中的先后顺序排序。
结合第五方面第三种可能的实现方式以及第四种可能的实现方式中的任意一种可能的实现方式,在第七种可能的实现方式中,第二发送单元包括:
第二发送时刻获取子单元,用于根据所述资源分配信息中指定的传输保护消息发送顺序或第二发送时刻指示信息获取第二发送时刻;
第二发送子单元,用于在所述当前交叠子信道中,在所述第二发送时刻发送所述传输保护消息;
其中,所述第二发送时刻为用于发送传输保护消息的时刻,在所述当前交叠子信道发送传输保护消息的每个站点分别对应一个所述第二发送时刻。
结合第五方面,或者第五方面第一至第七种任意一种可能的实现方式,在第八种可能的实现方式中,所述装置还包括第一传输保护指示信息获取单元,用于从所述资源分配信息中获取传输保护指示信息,所述传输保护指示信息指示所述站点是否发送传输保护消息,或指示是否允许所述站点发送传输保护消息;
所述第一交叠子信道获取单元具体用于当所述传输保护指示信息指示所述站点发送传输保护消息或指示允许所述站点发送传输保护消息时,根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道。
第六方面,本发明实施例提供了一种用于对数据传输进行保护的装置,设置于站点,所述装置包括:
第二接收单元,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道;
第二交叠子信道获取单元,用于根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
第三发送单元,用于在所述至少一个交叠子信道中发送所述传输保护消息;
其中,若所述站点发送传输保护消息的当前交叠子信道还供其他站点发送传输保护消息,则在当前交叠子信道中发送传输保护消息的多个站点在当前交叠子信道中同时发送所述传输保护消息,所述多个站点包括所述站点;
所述同时发送的传输保护消息相同;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的所述传输信道的独占时间。
在第六方面的第一种可能的实现方式中,所述多个子信道的带宽相等。
结合第六方面,或者第六方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息为清除发送CTS帧,或ACK帧。
结合第六方面,或者第六方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,所述第三发送单元具体用于在接收到所述资源分配信息之后,间隔预设时长,在所述至少一个交叠子信道中发送所述传输保护消息;或
所述第三发送单元具体用于在发送完至所述接入点的上行数据传输之后,间隔预设时长,在所述至少一个交叠子信道中发送所述传输保护消息。
结合第六方面,或者第六方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,所述第三发送单元具体用于在接收到所述资源分配信息之后,根据资源分配信息中指定的第三发送时刻,在所述第三发送时刻发送所述传输保护消息;或
所述第三发送单元具体用于在发送完至所述接入点的上行数据之后,根据资源分配信息中指定的第三发送时刻,在所述第三发送时刻发送所述传输保护消息;
其中,所述第三发送时刻为所述接入点为所述站点分配的、用于所述站点发送所述传输保护消息的时刻。
结合第六方面,或者第六方面第一至第二种任意一种可能的实现方式,在第五种可能的实现方式中,所述同时发送的传输保护消息相同,包括:
同时发送的传输保护消息采用相同的扰码序列进行加扰;且
同时发送的传输保护消息采用相同的调制编码方式;且
同时发送的传输保护消息的MAC层内容相同。
结合第六方面,或者第六方面第一至第五种任意一种可能的实现方式,在第六种可能的实现方式中,所述装置还包括第二传输保护指示信息获取单元,用于从所述资源分配信息中获取传输保护指示信息,所述传输保护指示信息指示所述站点是否发送传输保护消息,或指示是否允许所述站点发送传输传输保护消息;
所述第二交叠子信道获取单元具体用于,当所述传输保护指示信息指示所述站点 发送传输保护消息或指示允许所述站点发送传输保护消息时,根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道。
第七方面,本发明实施例提供了一种用于对数据传输进行保护的装置,设置于接入点,所述装置包括:
第一资源分配信息发送单元,,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
若所述当前交叠子信道中至少有两个站点发送传输保护消息,则所述至少两个站点依次发送传输保护消息;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至发送所述传输保护消息的站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述发送所述传输保护消息的站点对被分配给它的传输信道的独占时间。
在第七方面的第一种可能的实现方式中,,所述多个子信道的带宽相等。
结合第七方面,或者第七方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息为清除发送CTS帧,或ACK帧。
结合第七方面,或者第七方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,所述装置还包括第一下行数据发送单元,用于在所述第一资源分配信息发送单元发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
第一下行数据发送单元还用于在所述第一资源分配信息发送单元发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
结合第七方面,或者第七方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,所述装置还包括第二下行数据发送单元,用于接入点在发送完资 源分配信息后,接收所述站点发送的上行数据;在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述第二下行数据发送单元还用于在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
第八方面,本发明实施例提供了一种用于对数据传输进行保护的装置,设置于接入点,所述装置包括:
第二资源分配信息发送单元,用于发送资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
若所述当前交叠子信道中至少有两个站点发送传输保护消息,则所述至少两个站点同时发送传输保护消息,所述同时发送的传输保护消息相同;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至所述站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
在第八方面的第一种可能的实现方式中,所述多个子信道的带宽相等。
结合第八方面,或者第八方面第一种可能的实现方式,在第二种可能的实现方式中,所述传输保护消息为清除发送CTS帧,或ACK帧。
结合第八方面,或者第八方面第一至第二种任意一种可能的实现方式,在第三种可能的实现方式中,所述装置还包括第三下行数据发送单元,用于在所述第二资源分配信息发送单元发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则所述接入点在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
所述第三下行数据发送单元还用于发送完资源分配信息后,若在第一时长内检测 到工作频段空闲,则所述接入点在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
结合第八方面,或者第八方面第一至第二种任意一种可能的实现方式,在第四种可能的实现方式中,所述装置还包括第四下行数据发送单元,用于在在所述第二资源分配信息发送单元发送完资源分配信息后,接收所述站点发送的上行数据;
所述第四下行数据发送单元还用于在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述第四下行数据发送单元还用于在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
第九方面,本发明实施例提供了一种站点,包括:
接收机,用于接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道;
处理器,用于根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
所述处理器还用于判断所述用于所述站点发送传输保护消息的至少一个交叠子信道中的每一个交叠子信道是否仅供所述站点发送所述传输保护消息;
发射机,用于若当前交叠子信道仅供所述站点发送传输保护消息,则在所述当前交叠子信道中发送所述传输保护消息;
所述发射机还用于若当前交叠子信道还供其他站点发送传输保护消息,则根据预设规则,在所述当前交叠子信道中发送所述传输保护消息;
其中,若当前交叠子信道还供其他站点发送传输保护消息,则在所述当前交叠子信道中发送传输保护消息的多个站点在所述当前交叠子信道中依次发送所述传输保护消息,所述多个站点包括所述站点;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传 输信道的独占时间。
在第九方面的第一种可能的实现方式中,所述发射机具体用于:
若当前交叠子信道仅供所述站点发送传输保护消息,则在接收到所述资源分配信息后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;或,
所述发射机具体用于:若当前交叠子信道还供其他站点发送传输保护消息,则在接收到所述资源分配信息后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
结合第九方面,在第九方面的第二种可能的实现方式中,所述发射机具体用于:若当前交叠子信道仅供所述站点发送传输保护消息,则在发送完至所述接入点的上行数据之后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;或
所述发射机具体用于:若当前交叠子信道还供其他站点发送传输保护消息,则在发送完至所述接入点的上行数据之后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
第十方面,本发明实施例提供了一种站点,所述站点包括:
接收机,用于接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道;
处理器,用于根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
发射机,用于在所述至少一个交叠子信道中发送所述传输保护消息;
其中,若所述站点发送传输保护消息的当前交叠子信道还供其他站点发送传输保护消息,则在当前交叠子信道中发送传输保护消息的多个站点在当前交叠子信道中同时发送所述传输保护消息,所述多个站点包括所述站点;
所述同时发送的传输保护消息相同;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的所述传输信道的独占时间。
第十一方面,本发明实施例提供了一种接入点,所述接入点包括:
处理器,用于生成资源分配信息;
发射机,用于发送资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
接收机,用于若所述当前交叠子信道中至少有两个站点发送传输保护消息,则接收所述至少两个站点依次发送传输保护消息;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至发送所述传输保护消息的站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述发送所述传输保护消息的站点对被分配给它的传输信道的独占时间。
在第十一方面的第一种可能的实现方式中,所述发射机还用于发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
所述发射机还用于发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
结合第十一方面,在第十一方面的第二种可能的实现方式中,所述接收机还用于在发送完资源分配信息后,接收所述站点发送的上行数据;
所述发射机还用于在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述发射机还用于在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
第十二方面,本发明实施例提供了一种接入点,所述接入点包括:
处理器,用于生成资源分配信息;
发射机,用于发送资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在 所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
接收机,用于若所述当前交叠子信道中至少有两个站点发送传输保护消息,则接收所述至少两个站点同时发送的传输保护消息,所述同时发送的传输保护消息相同;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至所述站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
在第十二方面的第一种可能的实现方式中,所述发射机还用于发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
所述发射机还用于发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
结合第十二方面,在第十二方面的第二种可能的实现方式中,所述接收机还用于在发送完资源分配信息后,接收所述站点发送的上行数据;
所述发射机还用于在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述发射机还用于在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
本发明各实施例提供了一种数据传输保护方法及装置,站点接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给所述站点的传输信道,站点根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中发送传输保护消息,所述传输保护消息中包含持续时间,持续时间指示站点对被分配给它的传输信道的独占时间,从而使该接入点至该站点的数据传输得到保护,使其他第三方站点根据传输保护消息中的持续时间设置自己的持续时间,从而避开该AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至该STA的数据传输进行保护,提高了数据传输的可靠性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1所示为本发明实施例的对数据传输进行保护的方法的流程图;
图2所示为本发明实施例的某一传输信道上的数据传输的示意图;
图3所示为本发明实施例的传输信道和子信道交叠的示意图;
图4(a)和图4(b)为所示为本发明实施例的STA发送CTS帧的示意图;
图5所示为本发明实施例的STA发送传输保护消息的示意图;
图6所示为本发明实施例的STA发送传输保护消息的示意图;
图7所示为本发明实施例的STA发送传输保护消息的示意图;
图8所示为本发明实施例的STA发送传输保护消息的示意图;
图9所示为本发明实施例的STA发送传输保护消息的示意图;
图10所示为本发明实施例的STA发送传输保护消息的示意图;
图11所示为本发明实施例的STA发送传输保护消息的示意图;
图12所示为本发明实施例的STA发送传输保护消息的示意图;
图13所示为本发明实施例的STA发送传输保护消息的示意图;
图14所示为本发明实施例的STA的示意图;
图15所示为本发明实施例的AP的示意图;
图16所示为本发明实施例的对数据传输进行保护的方法的流程图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
为了全面理解本发明,在以下详细描述中提到了众多具体的细节,但是本领域技术人 员应该理解,本发明可以无需这些具体细节而实现。在其他实施例中,不详细描述公知的方法、过程、组件和电路,以免不必要地导致实施例模糊。
本发明实施例提供了一种用于对数据传输进行保护方法及装置,能保护AP至STA的下行数据传输。
实施例一
图1所示为本发明实施例的用于对数据传输进行保护的方法的流程图,如图1所示,所述方法用于STA,所述方法包括:
步骤101,站点接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道。
步骤102,所述站点根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述分配给所述站点的传输信道交叠的子信道;
步骤103,判断所述用于所述站点发送传输保护消息的至少一个交叠子信道中的每一个交叠子信道是否仅供所述站点发送所述传输保护消息;
步骤104,若当前交叠子信道仅供所述站点发送传输保护消息,则所述站点在所述当前交叠子信道中发送所述传输保护消息;
步骤105,若当前交叠子信道还供其他站点发送传输保护消息,则所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息;
其中,若当前交叠子信道还供其他站点发送传输保护消息,则在所述当前交叠子信道中发送传输保护消息的多个站点在所述当前交叠子信道中依次发送所述传输保护消息,所述多个站点包括所述站点;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
本发明各实施例提供了一种数据传输保护方法及装置,站点接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给所述站点的传输信道,站点根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中发送传输保护消息, 所述传输保护消息中包含持续时间,持续时间指示站点对被分配给它的传输信道的独占时间,从而使该接入点至该站点的数据传输得到保护,使其他第三方站点根据传输保护消息中的持续时间设置自己的持续时间,从而避开该AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至该STA的数据传输进行保护,提高了数据传输的可靠性。
决定每个站点占用的带宽的大小的因素很多,例如传输的数据量、信道条件等,如何给每个站点分配带宽并非本发明关注的重点,在此不再详述。
所谓“所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的传输信道”包括两种基本场景:对于只使用OFDMA的场景,所述资源分配信息中包含多个传输信道,每个传输信道对应一个站点;对于只使用MU-MIMO的场景,所述资源分配信息中只包含一个传输信道,该传输信道对应多个站点,即多个站点使用同一传输信道进行传输。此外,还可能出现混合的场景:传输信道在频域上划分为多个块,每个块中或者使用OFDMA,或者使用MU-MIMO,即通信系统中可能同时出现OFDMA和MU-MIMO。此时,所述资源分配信息中包含针对每个块的传输信道分配,而每个块的传输信道分配视使用OFDMA还是MU-MIMO而遵循基本场景的规则。被调度任一站点必位于某个块中,任一块中的资源分配必对应一个站点。
本发明实施例中的协议为802.11协议,在本发明实施例中,多个子信道的带宽可以相等,如每个子信道的带宽可以均为20MHZ,20MHZ的子信道是现有设备(相对于以后支持本发明实施例方案的新设备而言,其就是旧有设备)支持的频带,进而本发明实施例可以兼容旧有设备支持的协议,从而可以降低系统升级的成本。
被调度的多个站点与接入点之间的具有相同的频段。例如,802.11ac协议中,接入点和站点的工作于5GHz频段,该频段被划分为多个20MHz子信道,每个子信道具有确定的中心频率。工作频段和子信道划分由协议规定,接入点和站点均需遵守。网络遵循何种协议可在站点接入网络时从接入点处获得。
在本发明其他实施例中,多个子信道的带宽也可能不相等,例如,接入点与站点之间的工作频带为40MHZ,可以分为三个子信道,带宽分别为10MHZ、20MHZ、10MHZ。
本发明实施例中,所述传输保护消息为清除发送CTS帧,或ACK帧,这两种类型的帧都是现有设备(相对于以后支持本发明实施例方案的新设备而言,其就是旧有设备)能够 支持的帧,进而本发明实施例可以兼容旧有设备支持的协议,从而可以降低系统升级的成本。
本发明实施例中各个子信道带宽可以相同,如均为20MHZ子信道,这样可以兼容现有设备,提高本发明实施例的适用度,同时对现有的传输系统进行升级时无需替换旧有设备,系统升级成本较低;进一步当传输保护消息为CTS帧,或是ACK帧时,可以进一步提高提高本发明实施例的适用度,更好地兼容现有设备支持的协议。
本发明各实施例中,所述交叠指的是全部覆盖或部分覆盖,也可以是全部覆盖和部分覆盖的组合。图3所示为本发明实施例的多个子信道和STA的传输信道交叠的示意图。如图3所示,工作频段被划分为子信道320、子信道321以及子信道322。STA1的传输信道为310,STA2的传输信道为311,STA3的传输信道为312,STA4的传输信道为313。
如图3所示,子信道320覆盖了STA1的传输信道310的全部;子信道321覆盖了STA2的传输信道311的全部以及STA3的传输信道312的一部分,可以简称为子信道321覆盖了传输信道311和传输信道312;子信道322覆盖了STA3的传输信道312的一部分以及STA4的传输信道313的全部,可以简称为子信道322覆盖了传输信道312和传输信道312。
STA1的传输信道310覆盖了子信道320的一部分,STA2的传输信道311覆盖了子信道321的一部分,STA3的传输信道312覆盖了子信道321的一部分以及子信道322的一部分,STA4的传输信道313覆盖了子信道322的一部分。
交叠是相互的,即对于任意一个STA,例如STA3来说,它的传输信道312覆盖了子信道321和子信道322,其传输信道312也同时被传输信道子信道321和子信道322覆盖。
本发明实施例中,从STA发送至AP的数据可以称为上行数据,或上行数据传输;从AP发送至STA的数据可以称为下行数据,或下行数据传输。
下面简要说明通过持续时间对数据传输进行保护的原理,图2所示为本发明实施例某一传输信道上的数据传输的示意图,AP与STA在图2中未示出。如图2所示,AP发送资源分配信息201至某一STA,该STA广播发送传输保护消息,本实施例中传输保护消息为CTS帧202,CTS帧202携带有持续时间203。在持续时间203内,该传输信道仅发送AP至该STA的数据204,从而对数据传输204进行保护。
本发明实施例中,资源分配信息可以是触发(Trigger)帧,用于触发后续的数据传输。
当然,在该传输信道上,也可以只发送传输AP至STA的下行数据204,或可以只发送 传输STA至AP的上行数据205。
图2中的持续时间203表明了持续时间的开始时刻、结束时刻以及计时时长,实际上,持续时间只是一个数值,计量持续时间何时结束是采用NAV(Network Allocation Vector,网络分配矢量)。NAV相当于一个倒数的计时器,其初始值为持续时间,当NAV的计数变为0时,表示STA的独占时间结束。因此,图2中的203也可以看作是持续时间对应的NAV。
本发明实施例中,STA发送的CTS帧的作用在于保护AP至STA的下行数据的传输,因此,如果在传输了资源分配信息之后仅有STA至AP的上行数据需要传输,则无需对数据传输进行保护。如果同时有AP至STA的下行数据传输和STA至AP的上行数据传输,并且STA至AP的数据传输结束之后不需要AP反馈即时确认消息至STA,则需要进行传输保护,且传输保护的持续时间到AP至STA的数据传输结束即可,如图2中所示的持续时间203,无需保护STA至AP的数据传输,避免形成过保护;若同时有AP至STA的数据传输和STA至AP的数据传输,并且STA至AP的数据传输之后,需要AP反馈即时确认消息至STA,此时传输保护的结束时间需要到即时确认消息BA 210结束,如图2中所示的持续时间211,从而对AP至STA的即时确认消息BA 210也形成保护。
总之,每个STA发送的传输保护消息中的持续时间,可根据具体自身被调度的情况来决定其大小。不同STA发送的CTS帧的持续时间可以相同或不同,从而灵活地进行传输保护。
本发明实施例中的CTS帧皆可以用ACK帧来代替。本发明实施例中的传输保护消息也可以是其它能够被现有设备理解和解码的帧。后续实施例中,将以CTS帧为例进行描述。
本发明实施例中,所述在至少一个交叠子信道中发送传输保护消息,优选方案是在所有交叠子信道中发送传输保护消息。
本发明实施例的传输保护方法中,STA依次在多个交叠子信道中广播发送传输保护消息,使其他第三方STA根据传输保护消息中的持续时间设置自己的持续时间,从而避开AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至STA的数据传输进行保护,提高了数据传输的可靠性。
实施例二
步骤104中,若当前交叠子信道仅供所述站点发送传输保护消息,所述站点在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在接收到所述资源分配信息后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;
步骤105中,若当前交叠子信道还供其他站点发送传输保护消息,所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在接收到所述资源分配信息后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
图4(a)和图4(b)所示为本发明实施例的STA发送CTS帧的示意图。图4(a)和图4(b)所示的场景中,一个STA的传输信道覆盖了两个子信道以及一个子信道的一部分,每个子信道中,仅有一个STA发送CTS帧。
图4(a)中,某一STA的传输信道410覆盖了子信道420的一部分,还覆盖了两个子信道的全部,被全部覆盖的两个子信道分别为子信道421和子信道423,子信道420、421和422中,仅有该STA发送CTS帧。图4(a)仅显示了AP至STA的下行数据传输,STA在资源分配信息之后,在子信道420、子信道421、子信道422中分别发送CTS帧430、CTS帧431和CTS帧432,在不同子信道中发送的CTS帧430、CTS帧431和CTS帧432相同,包含相同的持续时间440。根据持续时间,可以对AP至该STA的数据传输进行保护。
如图4(b)所示,某一STA的传输信道411覆盖了子信道420的一部分,还覆盖了两个子信道的全部,被全部覆盖的两个子信道分别为子信道421和子信道423,子信道420、421和422中,仅有该STA发送CTS帧。STA和AP之间仅有STA至AP的数据传输,但有AP至STA的即时确认消息的情况。
此时,STA在资源分配信息之后,在子信道420、子信道421、子信道422中分别发送CTS帧430、CTS帧431和CTS帧432,在不同子信道中发送的CTS帧430、CTS帧431和CTS帧432相同,包含相同的持续时间441。
某一STA的传输信道覆盖多个子信道或多个子信道的一部分时,在每个子信道中发送CTS帧,CTS帧中包括持续时间,能在每个子信道中保护AP传输至该STA的数据。
图4(a)和图4(b)所示的场景仅为说明发送CTS帧的位置,并没有涉及到子信道中有多个STA发送CTS帧的情况。
实施例三
步骤104中,若当前交叠子信道仅供所述站点发送传输保护消息,所述站点在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在发送完至所述接入点的上行数据之后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;
步骤105中,若当前交叠子信道还供其他站点发送传输保护消息,所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点在发送完至所述接入点的上行数据之后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
若STA和AP之间仅有STA至AP的数据传输,但有AP至STA的即时确认消息的情况,此时,需要保护AP至STA的即时确认消息,STA发送的传输保护消息在时序上可位于STA至AP的上行数据传输之后,用于保护AP至STA的即时确认消息的传输。
实施例二中,STA发送的传输保护消息在资源分配信息之后,实施例三针对STA和AP之间仅有STA至AP的数据传输,但有AP至STA的即时确认消息的情况,此时,STA发送的传输保护消息可如图4(b)所示,在时序上可以位于资源分配信息之后,也可以如图5所示,在时序上可以位于STA至AP的上行数据传输之后,用于保护AP至STA的即时确认消息的传输。
图5所示为本发明实施例的STA发送CTS帧的示意图,图5所示的应用场景中,子信道和STA的传输信道的交叠情况如图4(a)和图4(b)所示,STA和AP之间仅有STA至AP的数据传输,但有AP至STA的即时确认消息的情况。
此时,STA发送的CTS帧530、531、532位于STA至AP的上行数据传输之后,CTS帧530、531、532包含相同的持续时间540。
实施例四
步骤105中,所述站点根据预设规则,在所述当前交叠子信道中发送所述传输保护消息,包括:
所述站点根据所述资源分配信息,获取在当前交叠子信道中发送所述传输保护消 息的多个站点;
所述站点根据排序规则,对所述多个站点排序,所述排序用于确定所述多个站点在所述当前交叠子信道中发送传输保护消息的顺序,所述多个站点包括所述站点;
所述站点根据所述排序获取所述站点发送传输保护消息的顺序;
所述站点根据所述发送传输保护消息的顺序获取对应的第一发送时刻;
所述站点在当前交叠子信道中,在所述第一发送时刻发送所述传输保护消息;
其中,所述排序规则为预设的排序规则,或所述资源分配信息中指示的排序规则。
其中,所述预设的排序规则可以包括:
根据站点ID从大到小排序;或
根据站点ID从小到大排序;或
根据站点在所述资源分配信息中的先后顺序排序。
图6所示为本发明实施例的STA发送传输保护消息的示意图,图6所示的场景中,传输保护消息为CTS帧,CTS帧在接收到资源分配信息之后发送。图6所示的场景中,某一子信道610覆盖了多个STA的传输信道,其中覆盖了STA1的传输信道620的一部分,覆盖了STA2,STA3的传输信道621和622的全部,其三个STA的ID分别为1、2、3,对应的传输信道分别620,621和622。STA1的传输信道620还覆盖了子信道611的一部分。
本场景中,发送规则为站点ID从小到大排序。STA1从资源分配信息中获取到子信道覆盖610的多个STA的ID,分别为1、2、3,从小到大排序后,获知本STA第一个发送CTS帧。
子信道610中,信道上每个帧的帧间间隔是可以预先设置的,例如,第一个CTS帧在接收到资源分配信息之后间隔预设时长的T1时刻发送,第二个CTS帧在与T1时刻间隔a时长的T2时刻发送,第三个CTS帧在和T2时刻间隔a时长的T3时刻发送。因此,获知本STA发送CTS帧的顺序,即可获知发送CTS帧的时刻。
本发明实施例中,预设时长可以短帧帧间间隔,a时长也可以是短帧帧间间隔加CTS的传输时长。短帧帧间间隔的时长由协议给定。承载传输保护消息的帧通常是固定长度的,并且使用特定调制编码方式发送,故其传输时长是固定的。例如,CTS帧采用最低阶调制编码方式在20MHz子信道上发送,需要的传输时长为44微秒。
如图6所示,STA1在T1时刻发送CTS帧630。同理,STA2在T2时刻发送CTS帧631, STA3在T3时刻发送CTS帧632。CTS帧630中包含持续时间640,CTS帧631中包含持续时间641,CTS帧640中包含持续时间641。
本发明实施例的传输保护方法,某一个子信道覆盖多个STA的传输信道时,即有多个STA在同一个子信道中发送CTS帧时,使STA按一定的顺序依次发送CTS帧,以实现传输保护,解决了同一个AP调度多个STA时,多个STA如何发送用于传输保护的CTS帧的问题,对随后AP至多个STA的下行数据传输进行了保护,提高了传输的可靠性。
实施例五
步骤105中,根据预设规则,在当前交叠子信道中发送传输保护消息,可以包括:
根据所述资源分配信息中指定的传输保护消息发送顺序或第二发送时刻指示信息获取第二发送时刻;
在所述当前交叠子信道中,在所述第二发送时刻发送所述传输保护消息;
其中,所述第二发送时刻为用于发送传输保护消息的时刻,在所述当前交叠子信道发送传输保护消息的每个站点分别对应一个所述第二发送时刻。
图7所示为本发明实施例的STA发送传输保护消息的示意图。图7所示的场景中,传输保护消息为CTS帧。某一子信道710覆盖了多个STA的传输信道,多个STA分别为STA1,STA2和STA3,覆盖的多个传输信道分别为720,721和722。
当每个STA只能接受部分STA的调度信息时,例如STA设置为仅接受本STA的调度信息时,AP发送给每一个STA的资源分配信息中可以包含指示该STA发送CTS帧的发送顺序。
如图7所示,AP指定的发送顺序是STA1、STA2和STA3。发送CTS帧的间隔是预先设置的,例如第一个CTS帧在接收到资源分配信息之后间隔预设时长的T1时刻发送,第二个CTS帧在T1时刻发送的CTS帧发送结束后间隔b时长的T2时刻发送,第三个CTS帧在T2时刻发送的CTS帧发送结束后间隔b时长的T3时刻发送。因此,获知本STA发送CTS帧的顺序,即可获知发送CTS帧的时刻。预设时长和b时长都可以是短帧帧间间隔。
本实施例中,STA1在T1时刻发送CTS帧730,STA2在T2时刻发送CTS帧731,STA3在T3时刻发送CTS帧732。CTS帧730中包含持续时间740,CTS帧731中包含持续时间731,CTS帧740中包含持续时间741。通过不同的持续时间对不同STA发送的下行数据进行保护。
本实施例中,AP也可以直接指定每个STA发送CTS帧的时刻,例如指定STA1在T1时 刻发送CTS帧,STA2在T2时刻发送CTS帧,STA3在T3时刻发送CTS帧。
本发明实施例中,AP指定STA发送CTS帧的顺序或指定各STA发送传输保护消息的第二发送时刻,避免了STA接收到过多的冗余的信息,例如其他STA的发送时刻,也可以解决STA无法接收所有STA调度信息时如何发送CTS帧的问题,能对AP随后发送至多个STA的数据进行保护,提高数据传输的可靠性。
图8所示为本发明实施例的STA发送传输保护消息的示意图,在图8所示的应用场景中,有STA发送至AP的上行数据传输,以及AP发送至STA的即时确认消息,仅需要保护AP至STA的即时确认消息,此时,STA可以在STA发送至AP的上行数据传输之后发送CTS帧。
可以根据站点的上行传输窗口时长以及指定的传输保护消息发送顺序来确定每个STA发送CTS帧的时刻,例如,第一个STA发送完至AP的上行数据后间隔预设时长的T1’时刻发送CTS帧,第二个STA在T1’时刻发送的CTS帧发送完之后间隔c时长的T2’时刻发送CTS帧。
预设时长和c时长可以是短帧帧间间隔。
实施例六
本发明实施例还提供了一种用于对数据传输进行保护的方法,如图16所示,所述方法包括:
步骤1601,站点接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给所述站点的传输信道,所述传输信道是所述接入点分配给所述站点的频带;
步骤1602,所述站点根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述站点的传输信道交叠的子信道;
步骤1603,在所述至少一个交叠子信道中发送所述传输保护消息;
其中,若所述站点发送传输保护消息的当前交叠子信道还供其他站点发送传输保护消息,则在当前交叠子信道中发送传输保护消息的多个站点在当前交叠子信道中同时发送所述传输保护消息,所述多个站点包括所述站点;
所述同时发送的传输保护消息相同;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的所述传输信道的独占时间。
进一步地,所述多个子信道的带宽可以相等。
进一步地,所述传输保护消息可以为清除发送CTS帧,或ACK帧。
可选的,步骤1603中,在所述至少一个交叠子信道中发送传输保护消息,包括:
在接收到所述资源分配信息之后,间隔预设时长发送所述传输保护消息;或
在发送完至所述接入点的上行数据传输之后,间隔预设时长发送所述传输保护消息。
可选的,本发明实施例中,步骤1603中,在所述至少一个交叠子信道中发送传输保护消息,包括:
在接收到所述资源分配信息之后,根据资源分配信息中指定的第三发送时刻,在所述第三发送时刻发送所述传输保护消息;或
在发送完至所述接入点的上行数据之后,根据资源分配信息中指定的第三发送时刻,在所述第三发送时刻发送所述传输保护消息;
其中,所述第三发送时刻为所述接入点为所述站点分配的、用于所述站点发送所述传输保护消息的时刻。
本实施例中,若一个子信道中有多个STA需要发送CTS帧,多个STA是同时发送传输保护消息,且同时发送的传输保护消息是相同的。
进一步地,所述同时发送的传输保护消息相同,可以包括:
同时发送的传输保护消息采用相同的扰码序列进行加扰;且
同时发送的传输保护消息采用相同的调制编码方式;且
同时发送的传输保护消息的MAC层内容相同。
为使多个站点的扰码序列相同,一种简单的实现方法是多个站点采用相同的扰码生成器初始状态值。例如,多个站点采用同一预定义的扰码生成器初始状态值,或采用与承载资源分配信息的帧相同的扰码序列,或采用基于同一规则自AP标识映射得到的序列,或采用基于同一规则自当前持续时间映射得到的序列,或采用基于同一规则自AP标识和当前持续时间映射得到的序列。其中,自当前持续时间是承载资源分配信息的帧中携带的持续时 间,或者将在CTS帧中携带的持续时间。
对于CTS帧,MAC层内容相同可以是:传输保护消息包含的RA域的值相同,包含的持续时间相同。例如,RA域为AP的地址。
预设时长可以是短帧帧间间隔。
当被调度的STA较多时,发送的传输保护消息也会很多,分时发送传输保护消息将会带来很大的开销。此外,如果一个子信道覆盖多个STA的传输信道,某个STA发送传输保护消息的顺序比较靠后,则该STA在收到资源分配信息之后,在发送传输保护消息之前的间隙较长,在此间隙中可能收到其他站点的信息,例如其他OBSS STA的CTS帧,此时该STA继续发送传输保护消息会对OBSS STA的传输形成干扰。同一个子信道覆盖多个STA的传输信道时,使多个STA同时发送传输保护消息,可以解决上述问题,降低系统开销,减小潜在的干扰。
在MAC层内容相同以及扰码序列相同的前提下,还需要调制编码方式相同,才能保证同时发送的传输保护消息的物理波形叠加后是可解的。调制编码方式包含调制方式和信道编码方案两个方面。一种优选的调制编码方式是,调制方式使用BPSK(Binary Phase Shift Keying,二进制相移键控),信道编码方案采用码率为1/2的BCC(Binary Convolutional Code,二进制卷积码)。
图9所示为本发明实施例的STA发送传输保护消息的示意图。图9所示的场景中,传输保护消息为CTS帧,某一子信道910覆盖了多个STA的传输信道,多个STA分别为STA1,STA2和STA3,覆盖的多个传输信道分别为920,921和922。子信道911覆盖STA4和STA5的传输信道。
STA1、STA2和STA3在接收到资源分配信息之后,间隔预设时长发送CTS帧830。
由于每个STA接收到资源分配信息的时刻是相同的,预设的帧间间隔时间也是相同的,因此多个STA发送CTS帧的时刻也是相同的,即多个STA是同时发送CTS帧的。
实际上,CTS帧830是多个相同的CTS帧叠加的结果。
资源分配信息中也可以指定第三发送时刻,使STA在接收资源分配信息后,在第三发送时刻发送CTS帧。
为保证多个CTS帧的叠加信号可被正确解码,本实施例中,多个站点在所述交叠子信道中发送的所述传输保护消息的帧MAC层内容相同,并且采用相同扰码序列进行加扰。
按照当前规则,每个STA发送传输帧的Data部分时,将随机选择一个扰码生成器初始状态(7-bit序列)值以生成扰码序列,然后使用该扰码序列对数据进行加扰,这将导致即使两个CTS帧包含的内容完全相同,但在物理波形上可能完全不同,因为STA随机选择的扰码生成器初始状态值不同导致扰码序列不同,对相同数据加扰之后的结果也不同。因此,为了保证不同STA发送的CTS在物理波形上可叠加,一般情况下,所有传输信道被同一个子信道覆盖的多个STA都使用相同的扰码生成器初始状态值。例如,所有STA都使用与资源分配信息相同的扰码生成器初始状态值。但由于资源分配信息可能是NDP帧,即不存在Data部分,也没有扰码生成器初始状态值,故这些STA也可选择其他值作为自己生成CTS的扰码生成器初始状态值,例如:
使用预定义的7-bit扰码生成器初始状态值;
AP在触发帧中显式指示7-bit扰码生成器初始状态值;
使用AP的MAC地址中的7-bit,例如最低7-bit;
使用触发帧HEW-SIG-A或HEW-SIG-B的CRC中的7-bit。
需要特别说明的是,只需要同一子信道中的多个CTS使用相同扰码序列即可,不同子信道中的CTS可以使用不同的扰码序列。例如,图9中两个子信道910和911上的CTS可以使用不同扰码序列。但所有子信道使用相同扰码序列是最简单的做法,也是优选做法。
另外,按照当前标准中的实现方法,当站点使用多个子信道发送时,每个子信道上的子载波相位可能伴随不同程度相位旋转,以便降低时域信号的峰均功率比,便于其它设备接收。本发明中CTS的发送也应遵照此规则,即STA对AP所调度的总带宽中包含的每个子信道,按照预定规则确定每个子信道的相位旋转,并在发送CTS时使用该相位旋转。由于多个STA遵循相同相位旋转规则,同一子信道上的多个CTS相位旋转相同,其叠加后的信号仍然是可解码的。
本发明实施例的方法中,多个STA同时发送CTS帧,可以降低系统开销,减小干扰。
本发明实施例提供了多种具体实施方式,在实际应用中,在初始化时就设置好了采用哪种具体的实施方式,因此在运行时不需要再指示采用哪种方式。
图9所示的实施例中,STA在接收到资源分配信息之后发送CTS帧,实际上,仅有STA至AP的数据传输,但有AP至STA的即时确认消息的情况,也可以在发送完至AP的上行数据传输之后发送CTS帧,具体可参考图5、图8所示的实施例。
实施例七
在步骤101之后,在步骤102之前,即在接收接入点发送的资源分配信息之后,在站点接收接入点发送的资源分配信息之后,在获取用于所述站点发送传输保护消息的至少一个交叠子信道之前,所述方法还可以包括:
所述站点从所述资源分配信息中获取传输保护指示信息,所述传输保护指示信息指示所述站点是否发送传输保护消息,或指示是否允许所述站点发送传输保护消息;
当所述传输保护指示信息指示所述站点发送传输保护消息或指示允许所述站点发送传输保护消息时,获取用于所述站点发送传输保护消息的至少一个交叠子信道。
并非所有被AP调度STA都需要下行传输保护。例如,距离AP很近的STA无需传输保护。因此,资源分配信息中可以携带是否使用传输保护的指示信息。本实施例可用于本发明所有的实施例中。
资源分配信息中携带的是否需要使用传输保护消息的指示信息方案可以有如下几种:
第一种,AP在资源分配信息中使用1bit指示,该指示的含义为:所有被调度STA要么都使用传输保护,要么都不使用。
第二种,AP在资源分配信息中指示每一个STA是否使用传输保护,例如可以使用位表(bitmap)进行指示。
第二种方案需要更多开销,但更加灵活,可有效减少CTS的数量,也可以降低时延扩展的影响。
第三种,AP发送的资源分配信息中不明确指示是否需要传输保护,每个STA根据自身情况决定是否使用传输保护。该方案仅适用于同时发送CTS的情况。
一种具体实现方法是,AP发送资源分配信息之后,若PIFS(Point Coordination Function Interframe Space,点协调功能帧间间隔)时间内接收到STA发送的CTS帧或检测到信道忙,则认为至少有一个STA需要传输保护,AP将在Trigger帧发送结束间隔2个SIFS加1个CTS传输时间的时刻开始传输数据,否则(AP在PIFS时间内检测到信道始终为空闲),将在Trigger帧发送结束间隔PIFS时间的时刻开始数据传输。从STA角度来说,如果需要进行传输保护,则在收到资源分配信息之后间隔SIFS的时刻发送CTS。PIFS大于SIFS。当然,除以Trigger帧结束为起点外,时间起始时刻也可以以上行数据结束为起点。
第四种,AP在资源分配信息中使用1bit指示,该指示含义为:允许使用传输保护,但每个STA根据自身情况决定是否使用传输保护;或不允许使用传输保护。
一种具体实现方法是,当指示位置为0时,被调度STA不允许使用传输保护;当指示位置为1时,AP发送资源分配信息之后,若PIFS(Point Coordination Function Interframe Space,点协调功能帧间间隔)时间内接收到STA发送的CTS帧或检测到信道忙,则认为至少有一个STA需要传输保护,AP将在Trigger帧发送结束间隔2个SIFS加1个CTS传输时间的时刻开始传输数据,否则(AP在PIFS时间内检测到信道始终为空闲),将在Trigger帧发送结束间隔PIFS时间的时刻开始数据传输。从STA角度来说,如果收到的指示位置为1且自身需要进行传输保护,则在收到资源分配信息之后间隔SIFS的时刻发送CTS。PIFS大于SIFS。当然,除以Trigger帧结束为起点外,时间起始时刻也可以以上行数据结束为起点。
第五种,AP通过Trigger帧隐式指示是否进行传输保护。该方法通常需要复用Trigger帧现有的某些域,其最终效果类似第一或第四种方案。
以通过隐式指示实现第四种方案为例,一种具体实现方法是,当Trigger帧的L-SIG(Legacy SIGNAL,旧有信令)域中的LENGTH域置为0时,表示AP允许被调度的STA进行传输保护;当Trigger帧的L-SIG域中的LENGTH域的值大于0时,表示AP不允许被调度的STA使用传输保护。
根据是否使用传输保护的指示信息来决定是否进行传输保护,可以避免过度保护,也可以节约系统资源。
实施例八
本发明实施例还提供了一种用于对数据传输进行保护的方法,所述方法包括:
接入点发送资源分配信息,所述资源分配信息中包括分配给至少两个站点的传输信道信息,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
若所述当前交叠子信道中至少有两个站点发送传输保护消息,则所述至少两个站点依次发送传输保护消息;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至发送所述传输保护消息的站点的下行数 据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述发送所述传输保护消息的站点对被分配给它的传输信道的独占时间。
可选的,本发明实施例中,发送完资源分配信息后,若在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则在所述资源分配信息发送结束后,间隔第二时长传输下行数据;
发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则在所述资源分配信息发送结束后,间隔第三时长传输下行数据。
可选的,本发明实施例中,接收完站点发送的上行数据之后,若在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则在所述上述数据接收结束后,间隔第二时长传输下行数据;
接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
可选地,本实施例中,所述第一时长可以为分布式帧间间隔的时长,第二时长可以为两个短帧间隔的时长与一个传输保护消息的传输时长的总和,第三时长为可以分布式帧间间隔的时长;
其中,分布式帧间间隔的时长大于短帧间隔的时长。
可选地,本实施例中,所述第一时长可以为点协调功能帧间间隔的时长,第二时长可以为两个短帧间隔的时长与一个传输保护消息的传输时长的总和,第三时长可以为点协调功能帧间间隔的时长;
其中,点协调功能帧间间隔的时长大于短帧间隔的时长。
本发明实施例还提供了一种用于对数据传输进行保护的方法,所述方法包括:
接入点发送资源分配信息,所述资源分配信息中包括分配给至少两个站点的传输信道信息,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
若所述当前交叠子信道中至少有两个站点发送传输保护消息,则所述至少两个站点同时发送传输保护消息,所述同时发送的传输保护消息相同;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子 信道是与所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至所述站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
实施例九
图10所示为本发明实施例的应用场景的示意图,如图10所示,信道被分为多个固有的子信道,每个子信道的带宽为20MHZ,图10中仅示出部分子信道。该信道中,有AP至STA的下行数据传输,STA至AP的上行数据传输,以及AP至STA的即时确认消息,每个子信道中CTS帧依次发送。
在子信道1010中,上行数据包括STA1和STA2分别传输至AP的数据,下行数据包括AP分别传输至STA1和STA3传输的数据。由于需要AP反馈即时确认消息至STA,因此STA1、STA2和STA3均需要发送CTS帧。
根据STA的ID从小到大排序,子信道1010中需要依次发送STA1、STA2和STA3分别发送的CTS1、CTS2和CTS3。
同理,在子信道1020中,需要依次发送STA3、STA4、STA5和STA6分别发送的CTS3、CTS4、CTS5和CTS6。
实施例十
图11所示为本发明实施例的应用场景的示意图,如图11所示,信道被分为多个子信道,每个子信道带宽为20MHZ,图11中仅示出部分子信道。该信道中,有AP至STA的下行数据传输,STA至AP的上行数据传输,以及AP至STA的即时确认消息,每个子信道中CTS帧同时发送。
在子信道1110中,上行数据包括STA1和STA2分别传输至AP的数据,下行数据包括AP分别传输至STA1和STA3传输的数据。由于需要反馈即时确认消息,因此STA1、STA2和STA3均需要发送CTS帧,各STA同时发送CTS帧。CTS123由STA1、STA2和STA3发送的CTS帧叠加而成。
同理,在子信道1120中,CTS3456由STA3、STA4、STA5和STA6发送的CTS帧叠加而成。
实施例十一
本发明的传输保护方法不仅适用于OFDMA,也适用于MU MIMO系统中。本实施例中,传输保护消息为CTS帧。
图12所示为本发明实施例的STA发送传输保护消息的示意图,图11所示的应用场景为MU MIMO系统。
如图12所示,资源分配信息调度多个STA的MIMO传输。在MU MIMO系统中,每个STA都在相同频带上接收数据,因此,数据保护帧的传输也应覆盖整个带宽。如图12所示,被调度的STA1、STA2、STA3和STA4在整个传输信道的每个子信道中发送传输保护消息,而多个STA之间可以按照发送规则排序,也可以由AP指定发送顺序。图12所示的应用场景中,STA1、STA2、STA3和STA4在每个子信道中,依次发送CTS1、CTS2、CTS3和CTS4。
同理,本发明的传输保护方法应用于MU MIMO系统中,多个STA也可以同时发送传输保护消息。图13所示为本发明实施例的STA发送传输保护消息的示意图。如图13所示,STA1、STA2、STA3和STA4在每个子信道中同时发送CTS1234。
可见,本发明实施例的传输保护方法在MU MIMO系统中也可以实现传输保护。
实施例十二
本发明实施例提供了一种STA,该STA用于执行上述STA依次发送传输保护消息的实施例中任一实施例提供的用于对数据传输进行保护的方法中STA所执行的功能。参见图14,该STA包括接收机1401、处理器1402和发射器1403(处理器可以为一个或多个,本实施例以一个为例,其他实施例中涉及处理器的地方可以参考此处进行理解);
接收机1401,用于接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给所述站点的传输信道,所述传输信道是所述接入点分配给所述站点的频带;
处理器1402,用于根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述站点的传输信道交叠的子信道;
所述处理器1402还用于判断所述用于所述站点发送传输保护消息的至少一个交叠子信道中的每一个交叠子信道是否仅供所述站点发送所述传输保护消息;
发射机1403,用于若当前交叠子信道仅供所述站点发送传输保护消息,则在所述当前 交叠子信道中发送所述传输保护消息;
所述发射机1403还用于若当前交叠子信道还供其他站点发送传输保护消息,则根据预设规则,在所述当前交叠子信道中发送所述传输保护消息;
其中,若当前交叠子信道还供其他站点发送传输保护消息,则在所述当前交叠子信道中发送传输保护消息的多个站点在所述当前交叠子信道中依次发送所述传输保护消息,所述多个站点包括所述站点;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
可选的,所述发射机1403还用于在接收到所述资源分配信息后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;
所述发射机1403还用于在接收到所述资源分配信息后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
可选的,所述发射机1403还用于在发送完至所述接入点的上行数据之后,间隔预设时长,在所述当前交叠子信道中发送所述传输保护消息;
所述发射机1403还用于在发送完至所述接入点的上行数据之后,间隔预设时长,根据预设规则在所述当前交叠子信道中发送所述传输保护消息。
本发明各实施例提供了一种站点,本发明各实施例提供了一种站点,可以使该接入点至该站点的数据传输得到保护,使其他第三方站点根据传输保护消息中的持续时间设置自己的持续时间,从而避开该AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至该STA的数据传输进行保护,提高了数据传输的可靠性。
实施例十三
本发明实施例还提供了一种STA,该STA用于执行上述STA同时发送传输保护消息的实施例中任一实施例提供的用于对数据传输进行保护的方法中STA所执行的功能。
所述STA包括:
接收机,用于接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给所述站点的传输信道,所述传输信道是所述接入点分配给所述站点的频带;
处理器,用于根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所 述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述站点的传输信道交叠的子信道;
发射机,用于在所述至少一个交叠子信道中发送所述传输保护消息;
其中,若所述站点发送传输保护消息的当前交叠子信道还供其他站点发送传输保护消息,则在当前交叠子信道中发送传输保护消息的多个站点在当前交叠子信道中同时发送所述传输保护消息,所述多个站点包括所述站点;
所述同时发送的传输保护消息相同;
所述传输保护消息用于保护所述接入点至所述站点的下行数据的传输,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的所述传输信道的独占时间。
本发明各实施例提供了一种站点,可以使该接入点至该站点的数据传输得到保护,使其他第三方站点根据传输保护消息中的持续时间设置自己的持续时间,从而避开该AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至该STA的数据传输进行保护,提高了数据传输的可靠性。
实施例十四
本发明实施例提供了一种AP,该AP用于执行上述对应的实施例中任一实施例提供的用于对数据传输进行保护的方法中AP所执行的功能,参见图15,该AP包括接收机1501、处理器1502和发射器1503;
处理器1502,用于生成资源分配信息;
发射机1503,用于发送资源分配信息,所述资源分配信息中包括分配给至少两个站点的传输信道信息,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
接收机1501,用于若所述当前交叠子信道中至少有两个站点发送传输保护消息,则接收所述至少两个站点依次发送传输保护消息;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是与所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至发送所述传输保护消息的站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述发送所述传输保护消息的 站点对被分配给它的传输信道的独占时间。
可选的,所述发射机1503还用于发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
所述发射机1503还用于发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
可选的,所述接收机1501还用于在发送完资源分配信息后,接收所述站点发送的上行数据;
所述发射机1503还用于在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述发射机1503还用于在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
本发明各实施例提供了一种接入点,可以使该接入点至该站点的数据传输得到保护,使其他第三方站点根据传输保护消息中的持续时间设置自己的持续时间,从而避开该AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至该STA的数据传输进行保护,提高了数据传输的可靠性。
实施例十五
本发明实施例提供了一种AP,该AP用于执行上述对应的实施例中任一实施例提供的用于对数据传输进行保护的方法中AP所执行的功能,该AP包括:
处理器,用于生成资源分配信息;
发射机,用于发送资源分配信息,所述资源分配信息中包括分配给至少两个站点的传输信道信息,以使接收到所述资源分配信息的站点根据所述资源分配信息获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中的每一个交叠子信道中发送传输保护消息;
接收机,用于若所述当前交叠子信道中至少有两个站点发送传输保护消息,则接收所述至少两个站点同时发送传输保护消息,所述同时发送的传输保护消息相同;
其中,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道 是与所述站点的传输信道交叠的子信道;
所述传输保护消息用于保护所述接入点至所述站点的下行数据,所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的传输信道的独占时间。
可选的,所述发射机还用于发送完资源分配信息后,若所述接入点在第一时长内接收到站点发送的传输保护消息或检测到工作频段忙,则在所述资源分配信息发送结束后,间隔第二时长发送至所述站点的下行数据;
所述发射机还用于发送完资源分配信息后,若在第一时长内检测到工作频段空闲,则在所述资源分配信息发送结束后,间隔第三时长发送至所述站点的下行数据。
可选的,所述接收机还用于在发送完资源分配信息后,接收所述站点发送的上行数据;
所述发射机还用于在接收完所述上行数据之后,若在第一时长内接收到所述站点发送的传输保护消息或检测到工作频段忙,则在所述上行数据接收结束后,间隔第二时长传输下行数据;
所述发射机还用于在接收完站点发送的上行数据之后,若在第一时长内检测到工作频段空闲,则在所述上述数据接收结束后,间隔第三时长传输下行数据。
在上述实施例中,对各个实施例的描述都各有侧重,某个实施例中没有详述的部分,可以参见其他实施例的相关描述。
本发明各实施例提供了一种接入点,可以使该接入点至该站点的数据传输得到保护,使其他第三方站点根据传输保护消息中的持续时间设置自己的持续时间,从而避开该AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至该STA的数据传输进行保护,提高了数据传输的可靠性。
本发明实施例提供了一种用于对数据传输进行保护的方法、装置及站点、接入点,站点接收接入点发送的资源分配信息,所述资源分配信息包含所述接入点分配给所述站点的传输信道,站点根据所述分配的传输信道以及多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,并在所述至少一个交叠子信道中发送传输保护消息,所述传输保护消息中包含持续时间,持续时间指示站点对被分配给它的传输信道的独占时间,从而使该接入点至该站点的数据传输得到保护,使其他第三方站点根据传输保护消息中的持续时间设置自己的持续时间,从而避开该AP至该STA需要进行数据传输的时间和频带,进而对该AP发送至该STA的数据传输进行 保护,提高了数据传输的可靠性。
在本发明提供的各个实施例中,对各个实施例的描述都各有侧重,某个实施例中没有详述的部分,可以参见其他实施例的相关描述。
本发明各实施例中,接入点分配给站点的包含在资源分配信息中的信道资源所指示的传输信道,可以是供站点随后用于数据传输的数据传输信道,例如以2MHz为最小单位进行分配的数据传输信道,这种情况下,站点需要根据数据传输信道反推出用于发送传输保护消息(如CTS帧)的一个或多个交叠子信道,所述交叠子信道,例如,数据传输信道所在的一个或多个20MHz信道;接入点分配给站点的包含在资源分配信息中的信道资源所指示的传输信道,也可以是AP指定的专门用于发送传输保护消息的子信道,即传输信道是以子信道宽度为最小单位指示的,例如AP指示站点在一个40MHz信道上发送传输保护消息,则站点在该40MHz信道所包含的两个20MHz子信道上同时发送传输保护消息。
对于装置实施例而言,由于其基本对应于方法实施例,所以相关之处可以参见方法实施例。以上所描述的装置实施例仅仅是示意性的,其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性劳动的情况下,即可以理解并实施。
本发明可以在由计算机执行的计算机可执行指令的一般上下文中描述,例如程序模块。一般地,程序模块包括执行特定任务或实现特定抽象数据类型的例程、程序、对象、组件、数据结构等等。也可以在分布式计算环境中实践本发明,在这些分布式计算环境中,由通过通信网络而被连接的远程处理设备来执行任务。在分布式计算环境中,程序模块可以位于包括存储设备在内的本地和远程计算机存储介质中。
本领域普通技术人员可以理解实现上述方法实施方式中的全部或部分步骤是可以通过程序来指令相关的硬件来完成,所述的程序可以存储于计算机可读取存储介质中,这里所称得的存储介质,如:ROM、RAM、磁碟、光盘等。
本领域技术人员可以理解的是,虽然本发明各实施例描述的方法包括以特定顺序出现的多个操作或步骤,但是这些方法可以包括更多或更少的操作或步骤,这些操作或步骤可以顺序执行或并行执行,并且这些顺序并不一定有严格的先后顺序。
还需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体 或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅为本发明的较佳实施例而已,并非用于限定本发明的保护范围。本文中应用了具体个例对本发明的原理及实施方式进行了闸述,以上实施例的说明只是用于帮助理解本发明的方法及其核心思想;同时,对于本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处。综上所述,本说明书内容不应理解为对本发明的限制。凡在本发明的精神和原则之内所作的任何修改、等同替换、改进等,均包含在本发明的保护范围内。

Claims (18)

  1. 一种用于对数据传输进行保护的方法,其特征在于,所述方法包括:
    站点接收接入点发送的触发Trigger帧;
    所述站点根据所述Trigger帧发送加扰后的传输保护消息,所述传输保护消息用于保护所述站点与所述接入点间的数据传输;
    所述传输保护消息在被加扰时采用与所述Trigger帧相同的扰码生成器初始状态值,所述扰码生成器初始状态值用于生成扰码序列以便对所述传输保护消息进行加扰。
  2. 如权利要求1所述的方法,其特征在于,所述Trigger帧中包含资源分配信息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的信道资源;所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的信道资源的独占时间。
  3. 如权利要求2所述的方法,其特征在于,所述至少两个站点在接收到所述资源分配信息后同时发送传输保护消息,所述传输保护消息用于保护发送所述传输保护消息的站点与所述接入点间的数据传输。
  4. 如权利要求3所述的方法,其特征在于,所述同时发送的传输保护消息相同。
  5. 如权利要求4所述的方法,其特征在于,所述同时发送的传输保护消息相同,包括:
    同时发送的传输保护消息采用相同的扰码序列进行了加扰;且
    同时发送的传输保护消息采用相同的调制编码方式;且
    同时发送的传输保护消息的MAC层内容相同。
  6. 如权利要求5所述的方法,其特征在于,所述同时发送的传输保护消息采用相同的扰码序列进行了加扰具体为:所述同时发送的传输保护消息在被加扰时采用与所述Trigger帧相同的扰码生成器初始状态值,所述扰码生成器初始状态值用于生成扰码序列以便对所述传输保护消息进行加扰。
  7. 如权利要求2-6任一所述的方法,其特征在于,所述站点根据所述Trigger帧发送传输保护消息,包括:
    所述站点根据所述Trigger帧中包含的资源分配信息中为所述站点分配的信道资源所指示的传输信道与多个子信道相互交叠的状况,获取用于所述站点发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是所述多个子信道与分配给所述站点的传输信道交叠的子信道;
    在所述至少一个交叠子信道中发送所述传输保护消息。
  8. 如权利要求1-7任一所述的方法,其特征在于,所述STA在接收到所述Trigger帧之后,间隔预设时长发送所述传输保护消息。
  9. 如权利要求1-8任一所述的方法,其特征在于,所述传输保护消息为清除发送CTS帧,或ACK帧。
  10. 一种站点,其特征在于,所述站点包括:
    接收机,用于接收接入点发送的触发Trigger帧;
    发射机,用于根据所述Trigger帧发送加扰后的传输保护消息,所述传输保护消息用于保护所述站点与所述接入点间的数据传输;
    处理器,用于生成所述加扰后的传输保护消息,所述传输保护消息在被加扰时采用与所述Trigger帧相同的扰码生成器初始状态值,所述扰码生成器初始状态值用于生成扰码序列以便对所述传输保护消息进行加扰。
  11. 如权利要求10所述的方法,其特征在于,所述Trigger帧中包含资源分配信 息,所述资源分配信息包含所述接入点分配给包括所述站点在内的至少两个站点的信道资源;所述传输保护消息中包含持续时间,所述持续时间用于指示所述站点对被分配给所述站点的信道资源的独占时间。
  12. 如权利要求11所述的方法,其特征在于,所述至少两个站点在接收到所述资源分配信息后同时发送传输保护消息,所述传输保护消息用于保护发送所述传输保护消息的站点与所述接入点间的数据传输。
  13. 如权利要求12所述的方法,其特征在于,所述同时发送的传输保护消息相同。
  14. 如权利要求13所述的方法,其特征在于,所述同时发送的传输保护消息相同,包括:
    同时发送的传输保护消息采用相同的扰码序列进行了加扰;且
    同时发送的传输保护消息采用相同的调制编码方式;且
    同时发送的传输保护消息的MAC层内容相同。
  15. 如权利要求14所述的方法,其特征在于,所述同时发送的传输保护消息采用相同的扰码序列进行了加扰具体为:所述同时发送的传输保护消息在被加扰时采用与所述Trigger帧相同的扰码生成器初始状态值,所述扰码生成器初始状态值用于生成扰码序列以便对所述传输保护消息进行加扰。
  16. 如权利要求11-15任一所述的方法,其特征在于,所述处理器还用于:
    根据所述Trigger帧中包含的资源分配信息中为所述站点分配的信道资源所指示的传输信道与多个子信道相互交叠的状况,获取用于所述发射机发送传输保护消息的至少一个交叠子信道,所述接入点与所述站点之间的工作频段被划分为多个子信道,所述交叠子信道是所述多个子信道与分配给所述站点的传输信道交叠的子信道;
    所述发射机具体用于在所述至少一个交叠子信道中发送所述传输保护消息。
  17. 如权利要求10-16任一所述的方法,其特征在于,所述发射机具体用于在接收到所述Trigger帧之后,间隔预设时长发送所述传输保护消息。
  18. 如权利要求10-17任一所述的方法,其特征在于,所述传输保护消息为清除发送CTS帧,或ACK帧。
PCT/CN2015/095714 2015-01-09 2015-11-26 用于对数据传输进行保护的方法、装置及站点、接入点 WO2016110163A1 (zh)

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EP15876663.4A EP3240351A4 (en) 2015-01-09 2015-11-26 Method and device for use in protecting data transmission, station, and access point
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110138535A (zh) * 2019-06-04 2019-08-16 西安易朴通讯技术有限公司 数据传输方法及装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3665810B1 (en) * 2017-08-09 2022-10-19 Telefonaktiebolaget LM Ericsson (Publ) Transient protection interval
US11272444B2 (en) * 2018-02-07 2022-03-08 Sony Corporation Communication apparatus and communication method for establishing protection areas for downlink communications
TWI760933B (zh) * 2020-11-23 2022-04-11 瑞昱半導體股份有限公司 無線通訊裝置及封包保護方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012110691A1 (en) * 2011-02-14 2012-08-23 Nokia Corporation Indicating status of radio resources in wireless network
CN102893534A (zh) * 2010-03-31 2013-01-23 高通股份有限公司 用于多用户mimo传输的保护机制
CN102948091A (zh) * 2010-05-26 2013-02-27 Lg电子株式会社 在无线lan系统中收发数据的方法和设备
CN103119982A (zh) * 2010-09-22 2013-05-22 高通股份有限公司 用于多信道操作的请求发送(rts)和允许发送(cts)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100943572B1 (ko) * 2003-12-23 2010-02-24 삼성전자주식회사 직교 주파수 분할 다중 접속 시스템에서 주파수재사용율을 고려한 적응적 부채널 할당 장치 및 방법
WO2011008023A2 (en) * 2009-07-15 2011-01-20 Lg Electronics Inc. Method and apparatus for controlling uplink power in a wireless communication system
US8451771B2 (en) * 2010-12-13 2013-05-28 Cisco Technology, Inc. Medium reservation techniques for multi-user transmissions
US9781627B2 (en) * 2013-04-08 2017-10-03 Qualcomm Incorporated Systems and methods for generating and decoding short control frames in wireless communications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102893534A (zh) * 2010-03-31 2013-01-23 高通股份有限公司 用于多用户mimo传输的保护机制
CN102948091A (zh) * 2010-05-26 2013-02-27 Lg电子株式会社 在无线lan系统中收发数据的方法和设备
CN103119982A (zh) * 2010-09-22 2013-05-22 高通股份有限公司 用于多信道操作的请求发送(rts)和允许发送(cts)
WO2012110691A1 (en) * 2011-02-14 2012-08-23 Nokia Corporation Indicating status of radio resources in wireless network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3240351A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110138535A (zh) * 2019-06-04 2019-08-16 西安易朴通讯技术有限公司 数据传输方法及装置
CN110138535B (zh) * 2019-06-04 2022-01-25 西安易朴通讯技术有限公司 数据传输方法及装置

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