WO2016029342A1 - 调整空闲信道评估门限值的方法和接入点 - Google Patents

调整空闲信道评估门限值的方法和接入点 Download PDF

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Publication number
WO2016029342A1
WO2016029342A1 PCT/CN2014/085096 CN2014085096W WO2016029342A1 WO 2016029342 A1 WO2016029342 A1 WO 2016029342A1 CN 2014085096 W CN2014085096 W CN 2014085096W WO 2016029342 A1 WO2016029342 A1 WO 2016029342A1
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WIPO (PCT)
Prior art keywords
access point
cca
parameter information
basic service
service set
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PCT/CN2014/085096
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English (en)
French (fr)
Inventor
孔雪丽
蓝洲
李彦淳
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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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 EP14900635.5A priority Critical patent/EP3182792B1/en
Priority to PCT/CN2014/085096 priority patent/WO2016029342A1/zh
Priority to CN201480081253.4A priority patent/CN106576392B/zh
Publication of WO2016029342A1 publication Critical patent/WO2016029342A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/002Transmission of channel access control information
    • H04W74/008Transmission of channel access control information with additional processing of random access related information at receiving side
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0808Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance

Definitions

  • the present invention relates to the field of wireless communication technologies and, more particularly, to methods and access points for adjusting idle channel estimation thresholds. Background technique
  • the 802.11 protocol standard of the Institute of Electrical and Electronics Engineers uses the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism for channel Treatment and competition.
  • CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
  • the CSMA/CA mechanism requires access points and stations to listen to the channel before sending a signal to prevent collisions.
  • the methods for access points and stations to listen to channels are physical carrier sensing and virtual carrier sensing. The signal can only be sent when both the physical carrier sense and the virtual carrier sense result indicate that the channel is idle.
  • Physical carrier sensing mainly uses idle channel estimation (CCA, English Clear Channel)
  • the Assessment method determines the state of the channel.
  • the node needs to judge before sending data on the channel. If the received Orthogonal Frequency Division Multiplexing (OFDM) transmitted signal has a power greater than or equal to the CCA threshold, the CCA method evaluates to the channel. The status is busy; otherwise, the status of the channel is considered idle.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the existing 802.11 protocol uses a fixed CCA threshold.
  • the malicious use of the channel by the outside world causes the CCA method to evaluate the channel as busy, which may make it difficult for nodes in the network to compete for the channel. Therefore, a fixed CCA threshold can result in reduced communication efficiency.
  • Embodiments of the present invention provide a method and an access point for adjusting an idle channel estimation threshold, which can dynamically adjust a CCA threshold.
  • the first aspect provides an access point, where the access point includes: a receiving unit, configured to receive parameter information sent by another access point, where the parameter information sent by the other access point indicates the another access The current channel occupancy status of the basic service set where the point is located; the adjusting unit is configured to adjust the CSA threshold value of the idle channel of the access point according to the parameter information sent by the other access point.
  • the parameter information sent includes the number of active nodes of the basic service set in which the other access point is located
  • the adjusting unit is specifically configured to: when the number of active nodes of the basic service set where the other access point is located is greater than the access When the number of active nodes of the basic service set is set, the CCA threshold of the access point is raised; when the number of active nodes of the basic service set where the other access point is located is smaller than the basic of the access point When the number of active nodes in the service set is reduced, the CCA threshold of the access point is lowered.
  • the adjusting unit is specifically configured to use the parameter information and other parameter information sent by the another access point, Adjusting a CCA threshold of the access point, the other parameter information including at least one of the following information: a location of a site of the basic service set where the access point is located, and a location of a site of the basic service set where the access point is located The power and path loss of the basic service set in which the access point is located.
  • the receiving unit is further used Receiving a CCA threshold of the another access point sent by the another access point, where the adjusting unit is specifically configured to use the parameter information sent by the another access point and the other access point CCA threshold, adjust the CC A threshold of the access point.
  • the access point further includes a storage unit, configured to store a CCA list, where the CCA list includes identification information of a neighboring access point of the access point, a CCA threshold of the neighboring access point, and a basic service set indicating the neighboring access point Parameter information of the current channel occupancy status.
  • the adjusting unit is specifically configured to adjust a CCA gate of the access point according to the change of the CCA list. Limit.
  • the access point further includes: a sending unit, An adjusted CCA threshold for transmitting the access point to a neighboring access point of the access point.
  • the access point further includes And a sending unit, configured to send, to the station of the basic service set where the access point is located, the indication information, where the indication information is used to indicate that the station adjusts the CCA threshold of the station according to the indication information.
  • the indication information sent by the sending unit includes the adjusted CCA threshold of the access point.
  • the receiving unit is specifically used Receiving a CCA request frame sent by the another access point, the CCA request frame includes parameter information sent by the another access point.
  • the CCA request frame received by the receiving unit is carried in an access network query protocol element or a public behavior frame.
  • the sending unit is configured to send a CCA response frame to the neighboring access point, where the CCA response frame is Contains the adjusted CCA threshold for the access point.
  • the CCA response frame sent by the sending unit is carried in a visited network query protocol element or a common behavior frame .
  • the indication information that is sent by the sending unit is in a beacon frame
  • a request The bearer is transmitted in the frame or probe response frame.
  • the beacon frame, the request transmission frame, or the probe response frame includes a CCA adjustment counter field.
  • a second aspect provides an access point, where the access point includes: a determining unit, configured to determine parameter information, where the parameter information indicates a current channel occupation status of a basic service set where the access point is located; The parameter information is sent to other access points.
  • the parameter information includes the number of active nodes of the basic service set, where the determining unit is specifically used to be an active node of the basic service set. When the number of the added or decreased number exceeds the threshold, the number of active nodes of the basic service set is determined as the parameter information.
  • the sending unit is further configured to send the access point to the other access point.
  • the idle channel evaluates the CCA threshold.
  • the sending unit is configured to send a CCA response frame to the other access point, where the CCA response frame includes The CCA threshold of the access point.
  • the CCA response frame sent by the sending unit is carried in an access network query protocol element or a public behavior frame.
  • the sending unit is specifically used Sending a CCA request frame to the other access point, the CCA request frame containing the parameter information.
  • the CCA request frame sent by the sending unit is carried in an access network query protocol element or a public behavior frame.
  • a method for adjusting an idle channel assessment threshold includes: the access point receives parameter information sent by another access point, and the parameter information sent by the another access point indicates the another The current channel occupancy status of the basic service set in which the access point is located; the access point adjusts the CSA threshold of the idle channel assessment of the access point according to the parameter information sent by the other access point.
  • the parameter information sent by the another access point includes the number of active nodes of the basic service set where the another access point is located, the access Adjusting the CCA threshold of the access point according to the parameter information sent by the other access point, including: when the number of active nodes of the basic service set where the other access point is located is greater than the location of the access point When the number of active nodes of the basic service set is increased, the access point increases the CCA threshold of the access point; when the number of active nodes of the basic service set where the other access point is located is smaller than the location of the access point When the number of active nodes of the basic service set is reduced, the access point lowers the CCA threshold of the access point.
  • the access point adjusts the idleness of the access point according to the parameter information sent by the another access point.
  • the channel assessment CCA threshold includes: the access point adjusts a CCA threshold of the access point according to parameter information and other parameter information sent by the other access point, where the other parameter information includes at least one of the following information: One: the location of the site of the basic service set in which the access point is located, the transmit power of the site of the basic service set in which the access point is located, and the path loss of the basic service set in which the access point is located.
  • the access point receives a CCA threshold of the another access point sent by the another access point, where the access Adjusting, according to the parameter information sent by the another access point, the CCA threshold of the idle channel of the access point, including: the parameter information sent by the access point according to the another access point, and the another access The CCA threshold of the point, adjust the CC A threshold of the access point.
  • the method further includes: The access point determines a CCA list, the CCA list includes identification information of the neighboring access point of the access point, a CCA threshold of the neighboring access point, and a current channel occupation indicating a basic service set in which the neighboring access point is located. Parameter information for the status.
  • the access point adjusts the access point according to the parameter information sent by the another access point.
  • the CCA threshold includes: The access point adjusts the CCA threshold of the access point according to the change of the CCA list.
  • the method further includes: the access point The neighboring access point of the access point sends the adjusted CCA threshold of the access point.
  • the method further includes: The access point sends the indication information to the station of the basic service set where the access point is located, where the indication information is used to indicate that the station 4 adjusts the CCA threshold of the station according to the indication information.
  • the indication information includes an adjusted CCA threshold of the access point.
  • the access point receives another The parameter information sent by an access point includes: the access point receives the CCA request frame sent by the another access point, and the CCA request frame includes parameter information sent by the another access point.
  • the CCA request frame is carried in an access network query protocol element or a common behavior frame.
  • the CCA threshold includes: the access point sends a CCA response frame to the neighboring access point, and the CCA response frame includes the adjusted CCA threshold of the access point.
  • the CCA response frame is carried in an access network query protocol element or a common behavior frame.
  • the indication information is in a beacon frame, a request sending frame, or a probe response Hosted in the frame.
  • the beacon frame, the request transmission frame, or the probe response frame includes a CCA adjustment counter field.
  • a fourth aspect provides a method for adjusting an idle channel estimation threshold, where the method includes: determining, by the access point, parameter information, where the parameter information indicates a current channel occupation status of a basic service set where the access point is located; The ingress sends the parameter information to other access points.
  • the parameter information includes the number of active nodes of the basic service set, where the access point determines parameter information, including: when the basic service set When the number of active nodes added or the number of reductions exceeds the threshold, the number of active nodes of the basic service set is determined as the parameter information.
  • the method further includes: the access point sending the access to the other access point The idle channel of the point evaluates the CCA threshold.
  • the method further includes: the access point sending the idle channel of the access point to the other access point Assessing the CCA threshold, the method includes: the access point sends a CCA response frame to the other access point, the CCA response frame including a CCA threshold of the access point.
  • the CCA response frame is carried in an access network query protocol element or a common behavior frame.
  • the access point to the other The sending, by the access point, the parameter information includes: sending, by the access point, a CCA request frame to the other access point, where the CCA request frame includes the parameter information.
  • the CCA request frame is carried in an access network query protocol element or a common behavior frame.
  • the access point adjusts its own CCA threshold according to the parameter information indicating the channel occupancy status sent by other access points. It can dynamically adjust the CCA threshold of the access point to improve communication efficiency.
  • FIG. 1 is a schematic diagram of a scenario in which an embodiment of the present invention may be applied.
  • FIG. 2 is a block diagram of an access point in accordance with one embodiment of the present invention.
  • FIG. 3 is a block diagram of an access point in accordance with another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a CCA request frame in accordance with an embodiment of the present invention.
  • FIG. 5 is a schematic illustration of a CCA response frame in accordance with one embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a CCA request frame according to another embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a CCA response frame according to another embodiment of the present invention.
  • FIG. 8 is a schematic illustration of a beacon frame in accordance with one embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a request to send frame according to an embodiment of the present invention.
  • Figure 10 is a schematic illustration of a probe response frame in accordance with one embodiment of the present invention.
  • FIG 11 is a block diagram of an access point in accordance with one embodiment of the present invention.
  • FIG. 12 is a schematic flowchart of a method for adjusting a CCA threshold value according to an embodiment of the present invention.
  • FIG. 13 is a schematic flowchart of a method for adjusting a CCA threshold value according to another embodiment of the present invention.
  • FIG. 14 is a schematic flowchart of a method for adjusting a CCA threshold value according to another embodiment of the present invention.
  • Figure 15 is a schematic flow diagram of a process of a method of adjusting a CCA threshold value in accordance with one embodiment of the present invention.
  • FIG 16 is a block diagram of an access point in accordance with another embodiment of the present invention.
  • FIG 17 is a block diagram of an access point in accordance with another embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.
  • An access point can also be called a wireless access point or hotspot, which can access the communication network.
  • the access point is connected to the switch of the wireless network and is also the core of the wireless network.
  • AP is an access point for mobile computer users to enter the wired network. It is mainly used in broadband homes, inside buildings and inside campus. The typical distance covers tens of meters to hundreds of meters.
  • the main technology is 802.11 series.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • a station (referred to as STA, English Station), which may be a wireless sensor, a wireless communication terminal or a mobile terminal, such as a mobile phone (or "cellular" phone) supporting WiFi communication function and a computer having wireless communication function, for example, may be Portable, pocket, handheld, computer built-in or in-vehicle wireless communication devices that support WiFi communication, which exchange voice and/or data with a wireless access network.
  • FIG. 1 is a schematic diagram of a scenario in which an embodiment of the present invention may be applied.
  • the embodiment of the present invention can be applied to a wireless local area network, and the wireless local area network can be a basic service set (abbreviated as BSS, English Basic Service Set) including an access point.
  • BSS basic service set
  • an access point a basic service set including an access point.
  • BSS English Basic Service Set
  • each basic service set may include one access point and a plurality of sites belonging to the access point.
  • the access point and site can be collectively referred to as a node.
  • a wireless local area network to which an embodiment of the present invention is applicable may include a plurality of basic service sets.
  • Each basic service set includes one AP and multiple STAs belonging to the AP. For example, AP 1 and STA 1 and STA 2 belonging to the AP 1. AP 2 and STA 3 and STA 4 belonging to the AP 2 and the like.
  • the basic service set can include a variety of parameters. Some of the parameters included in the basic service set can be Idle channel evaluation to affect nodes in this basic service set and nodes in other basic service sets
  • the parameters of the basic service set can be as follows: the number of active nodes of the basic service set, the transmit power of the base of the basic service set, the location information of the base of the basic service set, and the path loss of the basic service set.
  • FIG. 2 is a block diagram of an access point in accordance with one embodiment of the present invention.
  • a plurality of basic service sets and corresponding multiple access points may be included in the WLAN.
  • the access point 20 shown in Figure 2 can be any of a plurality of access points.
  • the access point 20 can include a receiving unit 21 and an adjustment unit 22.
  • the receiving unit 21 is configured to receive parameter information sent by another access point, where the parameter information sent by the other access point indicates a current channel occupation status of the basic service set where the another access point is located; The parameter information sent by the other access point adjusts the idle channel assessment CCA threshold of the access point 20.
  • the access point adjusts its own CCA threshold according to the parameter information indicating the channel occupancy status sent by other access points. It can dynamically adjust the CCA threshold of the access point to improve communication efficiency.
  • a basic service set can contain an access point.
  • a wireless local area network can include multiple basic service sets and corresponding multiple access points. In the embodiment of the present invention, only one of the plurality of access points is described. It should be understood that each access point in the WLAN that can detect the parameter information sent by another access point can adjust the respective CCA thresholds by using the method in the embodiment of the present invention.
  • Part of the parameter information included in the basic service set in which the other access point is located may affect the CCA threshold of the access point 20. Since the CCA threshold can be used to evaluate the channel occupancy status, the parameter information sent by the other access point can be used to indicate the current channel occupancy status of the basic service set in which the other access point is located. Specifically, another access point may send the currently changed parameter information to other access points when the parameter information of the basic service set in which it is located changes.
  • Multiple parameter information of multiple basic service sets can be changed in the WLAN. It should be understood that at a certain time, only one basic service set parameter information is allowed to be transmitted in the WLAN. Therefore, the description of an access point in the embodiment of the present invention is for a certain moment. In fact, at other times, the receiving unit 21 of the access point 20 may also receive parameter information sent by other access points. . For convenience of description, the embodiment of the present invention only receives a parameter sent by an access point at a certain moment. The situation of the information is described.
  • the parameter information transmitted by another access point may include at least one parameter that may indicate the current channel occupancy status of the basic service set in which the other access point is located. For example: the number of active nodes of the basic service set where another access point is located or the transmission power of the site of the basic service set where another access point is located. That is, the adjusting unit 22 can adjust the CCA threshold of the access point 20 according to at least one parameter. It should be understood that, if the number of active nodes of the basic service set in which another access point is located changes, the parameter information sent by the other access point may include the current active node of the basic service set where the other access point is located. number.
  • the method for adjusting the CCA threshold of the access point according to the parameter information sent by another access point is not limited in the embodiment of the present invention.
  • the method for the access point to adjust the CCA threshold of the access point according to the parameter information sent by another access point falls into the embodiment of the present invention.
  • the access point according to the embodiment of the present invention may use the parameter information sent by another access point to input the parameter information sent by another access point as an input, and calculate a new CCA threshold. .
  • the access point can adjust the CCA threshold of the access point to the new CCA threshold.
  • the access point in the embodiment of the present invention may also determine the adjustment granularity of the CCA threshold according to the parameter information sent by another access point, and may increase or decrease the connection multiple times according to the adjustment granularity of the CCA threshold.
  • the CCA threshold of the ingress point ultimately allows the access points and sites in the basic service set to communicate normally.
  • the adjustment unit of the part of the access point can set the adjustment amount of the CCA threshold to zero, that is, the CCA threshold of the part of the access point may not change.
  • the adjusting unit 22 may be configured according to the parameter information sent by another access point and the parameter information corresponding to the parameter information sent by the other access point in the basic service set where the access point 20 is located. Adjust the CCA threshold of access point 20.
  • the category of the parameter information sent by another access point and the category of the parameter information corresponding to the parameter information sent by the other access point in the basic service set where the access point is located may be the same.
  • the parameter information sent by another access point may include the number of active nodes of the basic service set in which the other access point is located and the transmission power of the site, and correspondingly, the basic service set where the access point is located and the other connection
  • the parameter information corresponding to the parameter information sent by the ingress may also include the number of active nodes of the basic service set in which the access point is located and the transmission power of the station.
  • the access point 20 may compare the parameter information sent by another access point with the basic service set where the access point is located and the parameter information sent by the other access point. Corresponding parameter information, and adjusting the CCA threshold of the access point 20 according to the comparison result; the parameter information sent by the other access point and the basic service set where the access point is located may be sent to the other access point.
  • the parameter information corresponding to the parameter information is subjected to an algorithm operation, and the CCA threshold value of the access point 20 is adjusted according to the operation result.
  • the embodiment of the present invention adjusts the CCA of the access point 20 according to the parameter information sent by another access point and the parameter information corresponding to the parameter information sent by the other access point in the basic service set where the access point is located.
  • the method of the threshold value is not limited.
  • the parameter information sent by another access point may include the number of active nodes of the basic service set where another access point is located.
  • the basic service set where the access point 20 is located is the basic service set where the access point is located. It should be understood that the basic service set may have an increased threshold and a reduced threshold for active nodes. When the increase in the number of active nodes exceeds the increase threshold or the decrease in the number of active nodes exceeds the decrease threshold, the number of active nodes affects the CCA threshold of itself or other access points.
  • the adjusting unit 22 may increase the CCA of the access point 20 Threshold; the adjustment unit 22 may lower the CCA threshold of the access point 20 when the number of active nodes of the basic service set in which the other access point is located is smaller than the number of active nodes of the basic service set in which the access point is located. value.
  • the access point 20 may determine the CCA according to the difference between the number of active nodes of the basic service set in which the other access point is located and the number of active nodes of the basic service set where the access point is located.
  • the granularity of the threshold is adjusted.
  • the adjusting unit 22 can increase or decrease the CCA threshold of the access point 20 based on the adjusted granularity of the CCA threshold.
  • the active node may occupy most of the channel. If the access point continues to use the original CCA threshold, the result of the CCA method will show that the status of the channel is busy. At this time, the access point needs to increase the CCA threshold of the access point, so that the result of the CCA method shows that the state of the channel is idle, so as to ensure normal communication between the access point and the site. Conversely, when the number of active nodes of other access points decreases, the access point can lower the CCA threshold of the access point.
  • the access point 20 when the access point 20 adjusts the CCA threshold of the access point according to the change of the number of active nodes, other parameter information may also be referred to.
  • the adjusting unit 22 can adjust the CCA threshold of the access point 20 according to the parameter information and other parameter information sent by another access point.
  • the other parameter information may include at least one of the following: a location of a site of a basic service set in which the access point is located, a transmit power of a site of the basic service set in which the access point is located, and the connection The path loss of the basic service set where the entry point is located. It should be understood that the path loss may be each path loss of each link in the basic service set, or may be the sum of each path loss of all links in the basic service set.
  • the adjusting unit 22 may qualitatively determine to increase or decrease the access point by comparing the number of active nodes of the basic service set in which the other access point is located with the number of active nodes of the basic service set in which the access point is located. 20 CCA threshold.
  • the adjustment unit 22 when the adjustment unit 22 qualitatively increases or decreases the CCA threshold of the access point 20, other parameter information may also be referred to. That is, the adjustment unit 22 can also quantitatively adjust the CCA threshold of the access point by referring to other parameter information.
  • the adjusting unit 22 may quantitatively adjust the CCA threshold of the access point according to the location of the site of the basic service set where the access point is located. The longer the distance between the access point and the site in the basic monthly service set, the lower the CCA threshold, that is, the greater the adjustment of the CCA threshold; the access point and the site in the basic service set. The shorter the distance, the higher the CCA threshold, that is, the greater the adjustment of the CCA threshold.
  • the adjusting unit 22 may quantitatively adjust the CCA threshold of the access point according to the transmit power of the site of the basic service set where the access point is located.
  • the adjusting unit 22 may quantitatively adjust the CCA threshold of the access point according to the path loss of the basic service set where the access point is located.
  • the access point may calculate a new CCA threshold of the access point by using an algorithm. It should be understood that different algorithms and adjustment methods will result in different threshold values for the specific values to which the CCA threshold is adjusted.
  • the specific method for the access point to adjust the CCA threshold of the access point to a certain threshold is not limited in the embodiment of the present invention.
  • the receiving unit 21 is further configured to receive a CCA threshold of the another access point sent by the another access point, where the adjusting unit 22 may be specifically configured to The parameter information sent by the other access point and the CCA threshold of the other access point adjust the CCA threshold of the access point 20. It should be understood that when the adjustment unit 22 adjusts the CCA threshold of the access point according to the parameter information sent by another access point, it is also possible to perform adjustment by referring to the CCA threshold of the other access point.
  • another access point is similar to access point 20. Therefore, analogous to access point 20, another access point can also adjust the CCA threshold of that other access point.
  • the method by which another access point adjusts its own CCA threshold may be the same as the method in which the access point 20 adjusts its own CCA threshold.
  • the other access point may adjust the CCA threshold of the other access point according to the method of the access point 20 at other times. Therefore, the CCA threshold of the other access point included in the parameter information sent by the other access point may be the adjusted CCA threshold at other times.
  • the access point may adjust the CCA threshold of the access point according to the parameter information indicating the channel occupation status and the CCA threshold of other access points. Based on the parameter information and CCA thresholds of other access points, more reference information can be obtained to improve the accuracy of adjusting the CCA threshold of the access point.
  • FIG. 3 is a block diagram of an access point in accordance with another embodiment of the present invention.
  • the access point 20 may further include a storage unit 23.
  • the names and labels of the same devices in Fig. 3 are the same as those used in the device of Fig. 2.
  • the storage unit 23 is configured to store a CCA list, where the CCA list includes identification information of the neighboring access point of the access point, a CCA threshold of the neighboring access point, and a current channel occupation indicating a basic service set where the neighboring access point is located. Parameter information for the status.
  • the access point of the access point may be an access point of other access points except the access point that can hear the information sent by the access point.
  • the access point in the embodiment of the present invention may receive information sent by another access point, and the other access point may be one of the neighboring access points.
  • the access point 20 stores the parameter information transmitted by another access point received by the receiving unit 21 in the CCA list.
  • the CCA list may include current parameter information and CCA threshold values of multiple access points. That is, when the parameter information of the neighboring access point and the CCA threshold change, the neighboring access point can send the current parameter information to the other access point analogously to the other access point. CCA threshold.
  • the access point 20 can store the parameter information sent by another access point in the CCA list, and can also record the parameter information and CCA threshold values of other access points in the CCA list.
  • the CCA threshold of the neighboring access point in the CCA list may include the changed CCA threshold of some access points in the neighboring access point, and may also include the unchanged CCA threshold of the remaining access points.
  • the parameter information of the neighboring access point in the CCA list may include changed parameter information of a part of the access points in the neighboring access point, and may also include parameter information of the remaining access points that are not changed.
  • each access point in a plurality of basic service sets may have a CCA list.
  • the identification information of neighboring access points in the CCA list can be used to identify different access points.
  • the CCA threshold of the neighboring access point in the CCA list and the parameter information of the neighboring access point may include information received by the receiving unit 21 from another access point and other access points.
  • the adjusting unit 22 may adjust the CCA threshold of the access point 20 according to the change of the CCA list.
  • the adjusting unit 22 of the access point 20 may adjust the CC A threshold of the access point 20 based on a parameter change of a part of the CCA list.
  • the adjusting unit 22 may adjust the CCA threshold according to the number of active nodes that change, and may refer to the location of the site of the basic service set where the access point 20 is located, the transmit power of the site of the basic service set, and the Information such as the path loss of the basic service set adjusts the CCA threshold of the access point 20.
  • the adjusting unit 22 may quantitatively adjust the CCA threshold of the access point according to the location of the site of the basic service set where the access point is located. The longer the distance between the access point and the site in the basic monthly service set, the lower the CCA threshold, that is, the greater the adjustment of the CCA threshold; the access point and the site in the basic service set. The shorter the distance, the higher the CCA threshold, that is, the greater the adjustment of the CCA threshold.
  • the adjusting unit 22 may quantitatively adjust the CCA threshold of the access point according to the transmit power of the site of the basic service set where the access point is located.
  • the adjusting unit 22 may quantitatively adjust the CCA threshold of the access point according to the path loss of the basic service set where the access point is located.
  • the basic service set is on the road
  • the adjustment amount of the low CCA threshold is larger.
  • the adjusting unit 22 of the access point 20 in the embodiment of the present invention may also use a CCA threshold value in which a part of the CCA list changes as a criterion for determining. For example, if the CCA threshold of the neighboring access point in the CCA list is greater than the CCA threshold of the access point 20 itself, the adjusting unit 22 may increase the CCA threshold of the access point 20; The changed CCA threshold of the neighboring access point is smaller than the CCA threshold of the access point 20 itself, and the adjusting unit 22 can lower the CCA threshold of the access point 20.
  • the adjusting unit 22 may also adjust the CC A threshold of the access point 20 based on the changed parameter information and the changed CCA threshold.
  • the adjusting unit 22 of the access point 20 may qualitatively increase or decrease the CCA threshold based on the changed parameter information in the CCA list, and then refer to the changed CCA threshold in the CCA list, and quantize. Determine a specific CCA threshold that is specifically raised or lowered.
  • the adjusting unit 22 may also use the changed parameter information and the changed CCA threshold as the input values, and calculate the access point 20 based on an algorithm.
  • the new CCA threshold and adjust the CCA threshold of access point 20 to the new CCA threshold.
  • the adjusting unit 22 of the access point 20 in the embodiment of the present invention may further use parameter information of all neighboring access points in the CCA list and CCA thresholds of all neighboring access points as The input value is calculated based on an algorithm to calculate a new CCA threshold of the access point 20, and the CCA threshold of the access point 20 is adjusted to be the new CCA threshold.
  • the method for adjusting the CCA threshold of the access point for the access point in the embodiment of the present invention is not limited thereto.
  • the access point 20 may further include a sending unit 24, where the sending unit 24 is configured to send the adjusted CCA threshold of the access point 20 to the neighboring access point of the access point 20. .
  • the adjusted CCA threshold can be sent to the neighboring access point of each access point.
  • the neighboring access points receive the adjusted CCA thresholds and can be stored in their respective CCA lists.
  • the changed CCA thresholds sent by multiple access points received by each access point in the neighboring access points at different times may constitute neighboring access points in the respective CCA lists of each access point.
  • the CCA list may include CCA threshold values of neighboring access points and parameter information of neighboring access points.
  • the transmitting unit 24 of the access point 20 may send the adjusted CCA threshold to the neighboring access point, and each access point of the neighboring access point stores the adjusted CCA threshold in the respective CCA list. .
  • each access point of the neighboring access point may also receive parameter information sent by other access points.
  • the CCA threshold and the parameter information constitute a CCA threshold of a neighboring access point in the CCA list of each access point.
  • the access point adjusts its CCA threshold according to the parameter information and the CCA threshold sent by the neighboring access point, and improves the accuracy of adjusting the CCA threshold.
  • the embodiment of the invention can accurately adjust the CCA threshold of the access point to improve communication efficiency.
  • the sending unit 24 of the access point 20 may further send indication information to the site in the basic service set where the access point where the access point is located, where the indication information is used to indicate that the site is configured according to the The indication adjusts the CCA threshold of the site.
  • the CCA threshold of the access point is adjusted in the embodiment of the present invention
  • the CCA threshold of the site in the basic service set where the access point is located may be adjusted. It should be understood that the access points in each basic service set in the network can adjust the CCA thresholds of the stations in their respective basic service sets after adjusting their CCA thresholds.
  • the access point in the embodiment of the present invention may adjust the CCA threshold of all stations in the basic service set, and may also adjust the CCA threshold of some stations in the basic service set.
  • the invention is not limited to this.
  • the access point 20 may determine, according to the adjusted CCA threshold of the access point 20, a new CCA threshold of all stations or parts of the site, and adjust The CCA threshold for all or part of the site is the new CCA threshold.
  • the access point 20 may also adjust the CCA threshold of the individual sites so that the individual sites can communicate concurrently.
  • the method for adjusting the CCA threshold of the site for the access point is not limited in the embodiment of the present invention.
  • the indication information may be represented by a data frame.
  • the transmitting unit 24 can transmit the indication information to the station in the basic service set in which the access point 20 is located.
  • the indication information may include a new CCA threshold that the station needs to adjust.
  • the station can adjust its own CCA threshold to the new CCA threshold according to the indication.
  • the access point 20 may use the self-adjusted CCA threshold as the new CCA threshold of the station of the basic service set.
  • the indication information can The adjusted CCA threshold of the access point 20 is included.
  • all stations of the basic service set in which the access point 20 is located can adjust its own CCA threshold to the adjusted CCA threshold of the access point 20.
  • the access point adjusts its own CCA threshold according to parameter information and CCA threshold values sent by other access points.
  • the access point can dynamically adjust the CCA threshold of the access point to improve communication efficiency.
  • the access point in the embodiment of the present invention can adjust the CCA threshold of the access point between the basic service sets, and adjust the site CCA threshold within the basic service set.
  • the access point adjusts the CCA threshold of all nodes in the network hierarchically, and the complex adjustment algorithm can only run on the access point.
  • the site only needs to cooperate with the access point to adjust the CCA threshold.
  • Embodiments of the present invention can reduce computational overhead and improve the flexibility and accuracy of the CCA threshold adjustment process of a node.
  • the receiving unit 21 may receive a CCA request frame sent by another access point, where the CCA request frame includes parameter information sent by another access point.
  • the CCA request frame received by the receiving unit 21 may be in an access network query protocol element (ANQP-element, English Access Network Query Protocol-element) or a public behavior frame (English Public Action Frame). Hosted.
  • ANQP-element English Access Network Query Protocol-element
  • a public behavior frame English Public Action Frame
  • FIG. 4 is a schematic diagram of a CCA request frame in accordance with an embodiment of the present invention.
  • the access network query protocol element may include an information identification (Info ID) field, a length (English Length) field, and an information (English Information) field.
  • the CCA request frame may also include an information identification field, a length field, and a parameter information field indicating a channel occupancy status of the basic service set of the adjacent access point.
  • the information field in the Access Network Query Protocol element may correspond to the parameter information field in the CCA Request frame.
  • the parameter information field in the CCA request frame may be used to carry parameter information sent by another access point.
  • the information identification field can occupy two bytes.
  • the information identification field may take a value that is not used.
  • the information identification field may take a value of 254.
  • the length field can take up two bytes.
  • the length field can be used to indicate the length of the frame.
  • the number of bytes occupied by the parameter information field can be fixed or variable. For example, when the parameter information sent by another access point carried by the parameter information field is the number of active nodes, the length of the parameter information field may be 2 bytes.
  • Reasonable Solution When the parameter information sent by another access point carried by the parameter information field is other parameters, the length of the parameter information field may be other bytes.
  • the sending unit 24 may send a CCA response frame to the neighboring access point of the access point 20, where the CCA response frame includes the adjusted CCA threshold of the access point 20.
  • the CCA response frame sent by the sending unit 24 may be carried in an access network query protocol element or a common behavior frame.
  • FIG. 5 is a schematic illustration of a CCA response frame in accordance with one embodiment of the present invention.
  • the access network query protocol element may include an information identification (Info ID) field, a length (English Length) field, and an information (English Information) field.
  • the CCA response frame may also include an information identification field, a length field, and a CCA Threshold field.
  • the information field in the Access Network Query Protocol element can correspond to the CCA Threshold field in the CCA Response frame.
  • the CCA Threshold value field in the embodiment of the present invention may be used to carry the adjusted CCA threshold of the access point.
  • the information identification field can occupy two bytes.
  • the information identification field may take an unused value, for example, the information identification field may take a value of 255. That is, when the value of the information identification field is 255, it indicates that the frame is a CCA response frame.
  • This length field can occupy two bytes. The length field can be used to indicate the length of the frame.
  • the number of bytes occupied by the CCA Threshold field can be fixed or variable. For the CCA threshold field, different quantization methods are used, and the number of bytes occupied will be different.
  • the adjustment range of the CCA threshold can be given as [-82dBm, -58dBm], and the adjustment granularity of the CCA threshold can be 3dB. If the quantization method shown in Table 1 is used, the CCA threshold field can occupy 3 bits (English bit). Optionally, the embodiment of the present invention does not limit the quantization process of the CCA threshold.
  • the range of adjustment of the CCA threshold can be used in other ranges, and the adjustment granularity of the CC A threshold can also take other values. If the adjustment range of the CC A threshold and the adjustment granularity of the CCA threshold change, the number of bits (bits) that the CCA threshold field can occupy also changes.
  • the CCA request frame and the CCA response frame are carried in the existing access network query protocol element, which simplifies the operation and is easy to implement.
  • the CCA request frame or the sending unit received by the receiving unit 21 is the CCA request frame or the sending unit received by the receiving unit 21
  • the CCA response frame sent by 24 can be carried in a common behavior frame.
  • the CCA request frame and the CCA response frame are specifically described below in conjunction with FIG. 6 and FIG.
  • FIG. 6 is a schematic diagram of a CCA request frame according to another embodiment of the present invention.
  • Common behavior frames include the Category (English Category) field and the Action details field.
  • the behavior detail field can be divided into multiple fields again.
  • the category field occupies 1 byte.
  • the CCA request frame may include a category field, a public behavior (English Public Action) field, and a parameter information field.
  • the parameter information field can be used to carry parameter information sent by another access point.
  • the category field can take a value of 4 and the public behavior field can take a value of 16. If the public behavior field has a value of 16, the frame can be considered as a CCA response frame.
  • the number of bytes occupied by the parameter information field can be fixed or variable. For example, when the parameter information sent by another access point carried by the parameter information field is the number of active nodes, the length of the parameter information field may be 2 bytes. It should be understood that when the parameter information sent by another access point carried by the parameter information field is other parameters, the length of the parameter information field may be other bytes.
  • FIG. 7 is a schematic diagram of a CCA response frame according to another embodiment of the present invention.
  • the public behavior frame includes a category field and a behavior detail field.
  • the behavior detail field can be divided into multiple fields again.
  • the category field occupies 1 byte.
  • the CCA response frame may include a category field, a common behavior field, and a CCA Threshold field.
  • the CCA Threshold field can be used to carry the adjusted CCA threshold of the access point.
  • the category field can take a value of 4, and the public behavior field can take other unused values. If the public behavior field takes the value, the frame can be considered as a CCA response frame.
  • the number of bytes occupied by the CCA Threshold field can be fixed or variable. For the CCA threshold field, different quantization methods are used, and the number of bytes occupied will be different. If the quantization method in Table 1 above is used, the CCA threshold can occupy 3 bits. For the CCA threshold field, different quantization methods are used, and the number of bytes occupied will be different. That is, if the adjustment range of the CCA threshold and the adjustment granularity of the CCA threshold change, the number of bits that the CCA threshold field can occupy also changes.
  • the indication information sent by the sending unit 24 may be carried in a beacon frame, a request sending frame, or a probe response frame.
  • the access point may uniformly adjust the CCA threshold of all stations in the first service set, and may also adjust the CCA threshold of some stations in a targeted manner, and the present invention is not limited thereto.
  • the station can receive the indication information and adjust its own CCA threshold according to the CCA threshold included in the indication information.
  • a beacon (English Beacon) frame, a request to send (RTS, English Request To Send) frame, or a probe response (English Probe Response) frame may include a CCA adjustment counter field.
  • the station can adjust the CCA threshold of the station periodically according to the CCA adjustment counter field included in the beacon frame, the request transmission frame, or the detection response frame.
  • FIG. 8 is a schematic illustration of a beacon frame in accordance with one embodiment of the present invention.
  • the beacon frame may include a Beacon frame body field and a CCA threshold field.
  • the CCA Threshold field can be placed at the end of the frame of the beacon frame.
  • the CCA adjustment counter field may also be included in the beacon frame.
  • the CCA adjustment counter field can be located next to the CCA threshold field or can be placed in the beacon frame. Tail.
  • FIG. 9 is a schematic diagram of a request to send frame according to an embodiment of the present invention.
  • the RTS frame may include a frame control (English Frame Control) field, a duration (English Duration) field, a receiver address (referred to as RA, English Receiver Address) field, and a sender address (referred to as TA, English Transmission Address). ) field, frame check sequence J
  • the CCA threshold field may be placed between any two fields in the RTS frame, for example, between the TA field and the FCS field, or at the end of the RTS frame.
  • the embodiment of the present invention does not limit the position of the CCA threshold field in the RTS frame.
  • the RTS frame may further include a CCA adjustment counter.
  • the CCA adjustment counter field can be located next to the CCA Threshold field or elsewhere in the RTS frame.
  • the invention is not limited to the ratio.
  • Figure 10 is a schematic illustration of a probe response frame in accordance with one embodiment of the present invention.
  • the probe response frame may include a probe response frame body (English Probe Response frame body) field and a CCA threshold (English CCA Threshold) field.
  • the CCA threshold field may be placed at the end of the frame of the probe response frame.
  • the CCA adjustment counter field may also be included in the probe response frame. This CCA adjustment counter field can be located next to the CCA Threshold field.
  • the CCA adjustment counter field included in Figures 8-10 is used to indicate that the station performs CCA threshold adjustment according to the indicated time.
  • the station may include a timer module for adjusting the counter field according to the CCA, and the CCA threshold of the station may be periodically adjusted so that multiple stations can be synchronized.
  • FIG 11 is a block diagram of an access point in accordance with one embodiment of the present invention. As shown in Figure 11, the access point 110 can interact with the access point 20 of Figure 2.
  • the access point 110 can include a determining unit 111 and a transmitting unit 112.
  • the determining unit 111 is configured to determine parameter information indicating a current channel occupancy status of the basic service set in which the access point 110 is located;
  • the sending unit 112 is configured to send the parameter information to other access points.
  • the access point sends parameter information indicating the current channel occupation status of the basic service set where the access point is located to other access points, so that other access points adjust the respective CCA thresholds according to the parameter information. .
  • a basic service set can contain an access point.
  • a wireless local area network can include multiple basic service sets and corresponding multiple access points. In the embodiment of the present invention, only one of the plurality of access points is described. It should be understood that each access point in the WLAN may send parameter information indicating the current channel occupancy status of the basic service set in which the access point is located to other access points.
  • Some of the parameter information included in the basic service set in which the access point 110 is located may affect the CCA threshold of other access points. Since the CCA threshold can be used to evaluate the channel occupancy status, the partial parameter information can be used to indicate the current channel occupancy status of the basic service set. Specifically, the access point 110 may send the parameter information that has been changed to other access points when the parameter information changes.
  • Multiple parameter information of multiple basic service sets can be changed in the WLAN. It should be understood that at some point, only one basic service set parameter information is allowed to be transmitted in the WLAN. Therefore, the description of an access point in the embodiment of the present invention is for a certain moment. In fact, at other times, another access point can also send parameter information to other access points. For convenience of description, the embodiment of the present invention describes only the case where one access point sends parameter information at a certain time.
  • the parameter information may include the number of active nodes of the basic service set in which the access point 110 is located, where the determining unit 111 is specifically configured to increase or decrease the number of active nodes of the basic service set. When the threshold is exceeded, the number of active nodes of the basic service set is determined as the parameter information. It should be understood that if the number of active nodes of the basic service set changes, the parameter information may include the current number of active nodes of the basic service set.
  • the parameter information of the basic service set may include at least one of the following parameters that may indicate the current channel occupancy status of the basic service set. For example: The number of active nodes of the basic service set and the transmit power of the base of the basic service set.
  • the parameter information sent by the sending unit 112 may include the number of active nodes in the basic service set.
  • the basic service set may have an increased threshold and a reduced threshold for active nodes.
  • the number of active nodes affects the CCA threshold of itself or other access points.
  • the access point 110 in the embodiment of the present invention may trigger the sending unit when the amount of increase of the number of active nodes exceeds the increase threshold or the decrease of the number of active nodes exceeds the decrease threshold. 112 The number of active nodes after the change is sent.
  • the sending unit 112 is further configured to send the CCA threshold of the access point 110 to other access points.
  • the access point 110 can also adjust its own CCA threshold according to the parameter information sent by other access points. This adjustment method can be the same as the method of adjusting the CCA threshold value for the access point involved in Figures 2-10. If the CCA threshold of the access point 110 changes, the transmitting unit 112 may also send the changed CCA threshold of the access point 110. If the CCA threshold of the access point 110 does not change, the transmitting unit 112 can also transmit a CCA threshold that has not changed.
  • the sending unit 112 may send a CCA response frame to other access points, where the CCA response frame may include a CCA threshold of the access point 110.
  • the CCA response frame sent by the sending unit 112 may be carried in an access network query protocol element or a common behavior frame.
  • the description of the CCA response frame in the embodiment of the present invention is applicable to the description of the CCA response frame in FIG. 5 and FIG. 7. To avoid repetition, it will not be described here.
  • the sending unit 112 may also be configured to send to other access points.
  • a CCA request frame may contain the parameter information.
  • the CCA request frame sent by the sending unit 112 may be carried in an access network query protocol element or a common behavior frame.
  • the description of the CCA request frame in the embodiment of the present invention is applicable to the description of the CCA request frame in FIG. 4 and FIG. 6. To avoid repetition, it will not be described here.
  • the access point 20 in the embodiment of the present invention may also dynamically adjust the CCA threshold of the site where the basic service set is located.
  • the station may include: a receiving unit and an adjusting unit, wherein
  • the receiving unit is configured to receive the indication information of the access point 20, where the indication information is used to indicate that the station adjusts the CCA threshold of the station according to the indication information;
  • the adjustment unit is configured to adjust the CCA threshold of the station according to the indication information.
  • Embodiments of the present invention can reduce overhead and improve the flexibility and accuracy of the CCA threshold adjustment process of a node.
  • the access point may adjust the CCA threshold of all stations in the basic service set, and may also adjust the CCA threshold of some stations in all stations.
  • the indication information may include a new CCA threshold determined by the access point 20 according to the adjusted CCA threshold of the access point 20.
  • the site can adjust the CCA threshold of the site to the new CCA threshold according to the indication information.
  • the indication information may include an adjusted CCA threshold of the access point 20, that is, the access point 20 uses the self-adjusted CCA threshold as a new CCA threshold of the site. value.
  • the station can adjust the CCA threshold of the site to the adjusted CCA threshold of the access point 20 according to the indication information.
  • the access point 20 can adjust the CCA threshold of individual sites so that the individual sites can communicate concurrently.
  • the indication information received by the receiving unit of the station may be carried in a beacon frame, a request sending frame, or a probe response frame.
  • the beacon frame, the request to send frame, or the probe response frame may carry a new CCA threshold value indicating the site in the information.
  • the format of the beacon frame, the request transmission frame, or the probe response frame may be a description of the beacon frame, the request transmission frame, or the probe response frame, respectively, as shown in FIGS. To avoid repetition, it will not be described in detail here.
  • the beacon frame, the request to send frame, or the probe response frame may include a CCA adjustment counter field.
  • the station may further include a timer unit.
  • the timer unit can adjust the counter field according to the CCA and periodically adjust the CCA threshold of the station.
  • the CCA adjustment counter field in FIGS. 8-10 is used to instruct the station to perform CCA threshold adjustment according to the indicated time.
  • the embodiment of the present invention can set an appropriate value in the CCA adjustment counter field. For example, if the value of the given CCA adjustment counter field in the beacon frame shown in FIG. 8 is 5, the station starts after receiving the 5th beacon frame after the current beacon frame. Adjust your own CCA threshold. Therefore, the timer unit of the station can adjust the counter field according to the CCA, and can periodically adjust the CCA threshold of the station, so that multiple stations can perform synchronization adjustment.
  • the access point adjusts its own CCA threshold according to parameter information and CCA threshold values sent by other access points.
  • the access point can dynamically adjust the CCA threshold of the access point to improve communication efficiency.
  • the access point in the embodiment of the present invention can adjust the CCA threshold of the access point between the basic service set, and adjust the CCA threshold of the site within the basic service set.
  • the access point can adjust the CCA threshold of all nodes in the network hierarchically, and the complex adjustment algorithm can only run at the access point, and the site only needs to cooperate with the access point to adjust the CCA threshold.
  • the embodiment of the invention can reduce the overhead and improve the flexibility and accuracy of the CCA threshold adjustment process of the node.
  • Figure 12 is a schematic flow diagram of a method of adjusting an idle channel assessment CCA threshold in accordance with one embodiment of the present invention.
  • the method illustrated in Figure 12 can be performed by the access point 20 of Figures 2-10. As shown in FIG. 12, the method may include:
  • the access point receives parameter information sent by another access point, where the parameter information sent by the other access point indicates a current channel occupation status of the basic service set where the another access point is located;
  • the access point adjusts an idle channel assessment CCA threshold of the access point according to the parameter information sent by the another access point.
  • the access point adjusts its own CCA threshold according to the parameter information indicating the channel occupancy status sent by other access points. It can dynamically adjust the CCA threshold of the access point to improve communication efficiency.
  • the parameter information sent by another access point may include the number of active nodes of the basic service set where another access point is located, and the access point is sent according to the other access point.
  • Parameter information, adjusting the CCA threshold of the access point may include:
  • the access point increases the CCA threshold of the access point;
  • the access point lowers the CCA threshold of the access point.
  • the access point may adjust a CCA threshold of the access point according to parameter information and other parameter information sent by another access point, where the other parameter information may include at least one of the following information.
  • the other parameter information may include at least one of the following information.
  • FIG. 13 is a schematic flowchart of a method for adjusting a CCA threshold according to another embodiment of the present invention. As shown in FIG. 13, the method may further include:
  • the access point receives a CCA threshold of another access point sent by the another access point.
  • the access point may adjust the CC A threshold of the access point according to the parameter information sent by the other access point and the CCA threshold of the other access point.
  • the method may further include:
  • the access point determines a CCA list, where the CCA list includes identification information of the neighboring access point of the access point, a CCA threshold of the neighboring access point, and a current service set indicating the neighboring access point. Parameter information of the channel occupancy status.
  • the access point may adjust the CCA threshold of the access point according to the change of the CCA list.
  • the method further includes:
  • the access point sends the adjusted CCA threshold of the access point to the neighboring access point of the access point.
  • the method further includes:
  • the access point sends the indication information to the site in the basic service set where the access point is located, where the indication information is used to indicate that the site adjusts the CCA threshold of the site according to the indication information.
  • the indication information may include an adjusted CCA threshold of the access point.
  • the access point may receive a CCA request frame sent by another access point, where the CCA request frame may include parameter information sent by another access point.
  • the CCA request frame may be carried in an access network query protocol element or a common behavior frame.
  • the access point may send a CCA response frame to the neighboring access point of the access point, where the CCA response frame may include the adjusted CCA of the access point. Threshold.
  • the CCA response frame may be carried in an access network query protocol element or a common behavior frame.
  • the indication information may be carried in a beacon frame, a request to send frame, or a probe response frame.
  • the beacon frame, the request to send frame, or the probe response frame may include a CCA adjustment counter field.
  • FIG. 14 is a schematic flowchart of a method for adjusting a CCA threshold value according to another embodiment of the present invention.
  • the method illustrated in Figure 14 can be performed by the access point 110 of Figure 11. As shown in Figure 14, the method can include:
  • the access point determines parameter information, where the parameter information indicates a current channel occupation status of the basic service set where the access point is located.
  • the access point sends the parameter information to other access points.
  • the access point sends parameter information indicating the channel occupation status of the basic service set where the access point is located to other access points, so that other access points adjust the CCA thresholds according to the parameter information.
  • the parameter information sent by the other access point may include the number of active nodes of the basic service set, where the access point determines the parameter information, including:
  • the number of active nodes of the basic service set or the number of reduced nodes exceeds the threshold, the number of active nodes of the basic service set is determined as the parameter information.
  • the method may further include:
  • the access point sends the access channel's idle channel evaluation CCA threshold value to the other access point.
  • the access point may send a CCA response frame to other access points, where the CCA response frame may include a CCA threshold of the access point.
  • the CCA response frame may be carried in an access network query protocol element or a common behavior frame.
  • the access point may send a CCA request frame by other access points, where the CCA request frame may include the parameter information.
  • the CCA request frame may be carried in an access network query protocol element or a common behavior frame.
  • 15 is a schematic flow chart of a process of a method of adjusting a CCA threshold value according to an embodiment of the present invention.
  • the process of adjusting the CCA threshold in FIG. 15 may include an interaction process between access points and an interaction process between the access point and the site.
  • the access point sends a CCA request frame to the neighboring access point, where the CCA request frame includes the changed parameter information.
  • a wireless local area network may include multiple basic service sets and corresponding multiple access points.
  • each access point in the WLAN may send a basic service set indicating the access point to the neighboring access point. Parameter information of the current channel occupancy status.
  • the access point may send the changed parameter information to the neighboring access point. It should be understood that this parameter information can affect the access point and other access points.
  • this parameter information can be used to indicate the current channel occupancy status of the basic service set.
  • the parameter information of multiple basic service sets can be changed in the WLAN. It should be understood that at a certain time, only one parameter information after the change of the basic service set is allowed to be transmitted. Therefore, the description of an access point in the embodiment of the present invention is for a certain moment.
  • the parameter information of the basic service set may include the number of active nodes of the basic service set. It should be understood that if the number of active nodes of the basic service set changes, the parameter information may include the number of active nodes of the basic service set.
  • the parameter information of the basic service set may include at least one of the following parameters that may indicate the current channel occupancy status of the basic service set. For example: the number of active nodes of the basic service set where the access point is located and the transmission power of the site of the basic service set.
  • the basic service set may have an increased threshold and a reduced threshold for active nodes.
  • the number of active nodes affects the CCA threshold of the own or neighboring access points.
  • the access point in the embodiment of the present invention may trigger the access point to send the changed after the increase of the number of active nodes exceeds the increase threshold or the decrease exceeds the decrease threshold. The number of active nodes.
  • the CCA request frame may be carried in an access network query protocol element or a common behavior frame.
  • the description of the CCA request frame applies to the description of the CCA request frame in FIGS. 4 and 6, and to avoid repetition, it will not be described here.
  • the neighboring access point that can detect the CCA request frame receives the CCA request frame. It should be understood that one of ordinary skill in the art will appreciate that the neighboring access point is an access point in other access points that can listen for information it transmits.
  • the neighboring access point extracts the changed parameter information from the received CCA request frame. After each of the neighboring access points receives the CCA request frame, each of the changed parameter information may be extracted.
  • the neighboring access point adjusts the respective CCA thresholds according to the extracted changed parameter information.
  • the part of the access point may set the adjustment amount to zero, that is, the part of the access point The CCA threshold of the point may not change.
  • the changed parameter information may include the number of active nodes of the basic service set in which the access point is located.
  • the neighboring access points when the number of active nodes in the extracted changed parameter information is greater than the number of active nodes in the basic service set where the neighboring access point is located, the neighboring access points may increase their respective CCA thresholds. Value: When the number of active nodes in the extracted parameter information is smaller than the number of active nodes in the basic service set where the neighboring access point is located, the neighboring access point may lower the CCA threshold of the access point. Specifically, when the neighboring access points increase or decrease the respective CCA thresholds, the difference between the number of active nodes in the extracted parameter information and the number of active nodes of the neighboring access points may be determined. Determine the granularity of adjustment of the CCA threshold.
  • the neighboring access point can also refer to other parameter information when adjusting the CCA threshold according to the change of the number of active nodes.
  • the other parameter information may include at least one of the following information: a location of a site in a basic service set in which the access point is located, a transmit power of a site in a basic service set in which the access point is located, and a basic service in which the neighboring access point is located. The path loss of the set.
  • the higher the CCA threshold that is, the greater the adjustment of the CCA threshold.
  • the neighboring access point may determine to adjust or lower the new CCA of the neighboring access point. Threshold. It should be understood that different algorithms and adjustment methods will result in different threshold values for the specific value of the CCA threshold.
  • the specific method for adjusting the CCA threshold of the neighboring access point to a certain threshold is not limited in the embodiment of the present invention.
  • each access point in the network can save a list of CCAs.
  • the CCA list includes identification information of the neighboring access point, a CCA threshold of the neighboring access point, and parameter information indicating the current channel occupancy status of the basic service set in which the neighboring access point is located.
  • the neighboring access point can store the received changed parameter information in the CCA list.
  • the CCA list may include parameter information after the change of the neighboring access point and the changed CCA threshold. That is to say, the parameter information of the neighboring access point and the CCA threshold change, and the changed parameter information and the CCA threshold may be sent to the neighboring access point analogously to the access point.
  • the identification information of multiple access points in the CCA list can be used to identify different access points.
  • the CCA threshold of a plurality of access points in the CCA list and the changed parameter information of the plurality of access points may include information received from the plurality of access points.
  • the neighboring access point may further adjust a CCA threshold of each access point in the neighboring access points according to the respective CCA list.
  • the neighboring access point can adjust the respective CCA thresholds of the neighboring access points based on the changed parameter information in the CCA list. Specifically, the neighboring access point may adjust the CCA threshold according to the number of active nodes, and refer to the base where the adjacent access points are located. Information such as location, power, and path loss of the site of the service set to adjust the respective access points of the neighboring access points
  • the higher the CCA threshold that is, the greater the adjustment of the CCA threshold.
  • the neighboring access point may also use the CCA threshold value that changes in the CCA list as the criterion for determining. For example, if the changed CCA threshold in the CCA list is greater than the CCA threshold of the neighboring access point itself, the neighboring access point increases the respective CCA threshold; if the CCA threshold changes in the CCA list Less than the CCA threshold of the neighboring access point itself, the neighboring access point lowers the respective CCA threshold.
  • the neighboring access point may also adjust the respective CCA thresholds based on the changed parameter information and the changed CCA threshold.
  • the neighboring access point can qualitatively increase or decrease the CCA threshold based on the changed parameter information in the CCA list, and then refer to the changed CCA threshold in the CCA list to determine the specific height. Or turn down to a certain CCA threshold.
  • the neighboring access point may also use the changed parameter information and the changed CCA threshold as the input values, and calculate respective new ones based on an algorithm. CCA threshold.
  • the neighboring access point may also use the parameter information of all access points in the CCA list and the CCA threshold of all access points as input values.
  • a new CCA threshold for neighboring access points is calculated based on an algorithm.
  • the specific algorithm of the adjustment algorithm in the embodiment of the present invention is not limited thereto. 155.
  • the neighboring access point sends a CCA response frame to other access points in the network, where the CCA response frame includes the adjusted CCA threshold of the neighboring access point.
  • the description of the CCA response frame in the embodiment of the present invention is applicable to the description of the CCA response frame in FIG. 5 and FIG. 7. To avoid repetition, it will not be described here.
  • the neighboring access point sends indication information to the site in the basic service set, so that the site of the basic service set adjusts the CCA threshold of the site according to the indication information.
  • each access point in the neighboring access point can adjust the CCA threshold of the station in its basic service set after adjusting its own CCA threshold.
  • the sites in the basic service set in which each access point is located are adjusted, and the CCA thresholds of all sites in the basic service set may be adjusted, or some sites in all sites may be adjusted.
  • the CCA threshold is adjusted.
  • the neighboring access point may determine a new CCA threshold of all stations or parts of the site according to the respective adjusted CCA thresholds, and adjust all the sites or The CCA threshold for some sites is the new CCA threshold.
  • the neighboring access point may also adjust the CCA threshold of the individual site so that the individual site can communicate concurrently.
  • the method for adjusting the CCA threshold of the site by the neighboring access points is not limited in the embodiment of the present invention.
  • the indication information may be represented by a data frame.
  • the indication information may include a new CCA threshold that the station needs to adjust. According to the indication information, the site can adjust its own CCA threshold to the new CCA threshold.
  • each access point of the neighboring access point may use its adjusted CCA threshold as the new CCA threshold of the station.
  • the indication information may include the adjusted CCA threshold.
  • the station can adjust its own CCA threshold to the adjusted CCA threshold of the access point to which the station belongs according to the indication information.
  • the indication information may be carried in a beacon frame, a request to send frame, or a probe response frame.
  • the description of the indication information may be the same as the description of the indication information carried in different data frames in FIG. 8 to FIG. 10. To avoid repetition, it will not be described here.
  • the access point adjusts its own CCA threshold according to the parameter information sent by other access points and the CCA threshold.
  • the CCA threshold of the access point can be dynamically adjusted to improve communication efficiency.
  • the access point can adjust the access point CCA threshold between the basic service set, and adjust the site CCA threshold within the basic service set. In this way, the access point can adjust the CCA threshold of all nodes in the network hierarchically, and the complex adjustment algorithm can only run on the access point, and the site only needs to cooperate with the access point to adjust the CCA threshold.
  • the embodiment of the invention can reduce the overhead and improve the flexibility and accuracy of the CCA threshold adjustment process of the node.
  • FIG. 16 is a block diagram of an access point in accordance with another embodiment of the present invention.
  • the access point 160 of Figure 16 can be used to implement the steps and methods of the above method embodiments.
  • the access point 160 of FIG. 16 includes a processor 161, a memory 162, a receiving circuit 163, and a transmitting circuit 164.
  • the processor 161, the memory 162, the receiving circuit 163, and the transmitting circuit 164 are connected by a bus system 169.
  • the access point 160 may also include an antenna 165 or the like.
  • the processor 161 controls the operation of the access point 160.
  • Memory 162 can include read only memory and random access memory and provides instructions and data to processor 161.
  • a portion of the memory 162 may also include non-volatile line random access memory (referred to as NVRAM).
  • transmit circuitry 164 and receive circuitry 163 can be coupled to antenna 165.
  • the various components of access point 160 are coupled together by a bus system 169, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 169 in the figure.
  • Processor 161 may be an integrated circuit chip with signal processing capabilities.
  • the processor 161 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or a transistor logic device. , discrete hardware components.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor 161 reads the information in the memory 162 and controls the various components of the access point 160 in conjunction with its hardware.
  • the access point 160 performs the following operations: receiving parameter information sent by another access point, where the parameter information sent by the other access point indicates that the other access point is located Current channel occupancy status of the basic service set;
  • the access point sends the parameter indicating the channel occupancy status according to other access points.
  • Number information adjust its own CCA threshold. It can dynamically adjust the CCA threshold of the access point to improve communication efficiency.
  • the parameter information sent by another access point may include the number of active nodes of the basic service set in which the other access point is located, and the processor 161 may
  • the CCA threshold of the access point is increased
  • the CCA threshold of the access point is lowered.
  • the processor 161 may adjust a CCA threshold of the access point 160 according to parameter information and other parameter information sent by another access point, where the other parameter information may include the following information. At least one: a location of a site in a basic service set in which the access point is located, a transmit power of a site of the basic service set in which the access point is located, and a path loss of a basic service set in which the access point is located.
  • the receiving circuit 163 may further receive a CCA threshold of the another access point sent by another access point; where the processor 161 may send parameters according to the other access point.
  • the information and the CCA threshold of the other access point adjust the CCA threshold of the access point.
  • the memory 162 may be configured to store a CCA list, where the CCA list includes identification information of a neighboring access point of the access point, a CCA threshold of the neighboring access point, and a neighboring access. Parameter information of the channel occupancy status of the basic service set where the point is located.
  • the processor 161 may adjust the CCA threshold of the access point according to the change of the CCA list.
  • the transmitting circuit 164 may send the adjusted CCA threshold of the access point to a neighboring access point of the access point 160.
  • the transmitting circuit 164 may send indication information to the site in the basic service set where the access point is located, where the indication information is used to indicate that the station adjusts the CCA threshold of the site according to the indication information.
  • the indication information sent by the transmitting circuit 164 may include an adjusted CCA threshold of the access point.
  • the receiving circuit 163 may receive a CCA request frame sent by the another access point, where the CCA request frame may include parameter information sent by the another access point.
  • the CCA request frame received by the receiving circuit 163 may be Access to network query protocol elements or bearers in public behavior frames.
  • the transmitting circuit 164 may send a CCA response frame to the neighboring access point of the access point 160, where the CCA response frame may include the adjusted CCA threshold of the access point.
  • the CCA response frame sent by the transmitting circuit 164 may be carried in an access network query protocol element or a common behavior frame.
  • the indication information sent by the transmitting circuit 164 may be carried in a beacon frame, a request transmission frame, or a probe response frame.
  • the beacon frame, the request to send frame, or the probe response frame may include a CCA adjustment counter field.
  • the access point adjusts its own CCA threshold according to parameter information and CCA threshold values sent by other access points.
  • the CCA threshold of the access point can be dynamically adjusted to improve communication efficiency.
  • the access point can adjust the CCA threshold of the access point between the basic service set, and adjust the CCA threshold of the site within the basic service set.
  • the access point can adjust the CCA threshold of all nodes in the network hierarchically to operate the complex adjustment algorithm only on the access point, and the site only needs to cooperate with the access point to adjust the CCA threshold.
  • the embodiment of the invention can reduce the overhead and improve the flexibility and accuracy of the CCA threshold adjustment process of the node.
  • FIG. 17 is a block diagram of an access point in accordance with another embodiment of the present invention.
  • the access point 170 of Figure 17 can be used to implement the steps and methods of the above method embodiments.
  • the access point 170 of FIG. 17 includes a processor 171, a memory 172, a receiving circuit 173, and a transmitting circuit 174.
  • the processor 171, the memory 172, the receiving circuit 173, and the transmitting circuit 174 are connected by a bus system 179.
  • the access point 170 can also include an antenna 175 or the like.
  • the processor 171 controls the operation of the access point 170.
  • Memory 172 can include read only memory and random access memory and provides instructions and data to processor 171.
  • a portion of the memory 172 may also include non-volatile line random access memory (referred to as NVRAM).
  • transmit circuitry 174 and receive circuitry 173 can be coupled to antenna 175.
  • the various components of access point 170 are coupled together by a bus system 179, which includes, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 179 in the figure.
  • Processor 171 may be an integrated circuit chip with signal processing capabilities. Above The processor 171 can be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or a transistor logic device, and a discrete device. Hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor 171 reads the information in the memory 172 and controls the various components of the access point 170 in conjunction with its hardware.
  • the access point 170 performs the following operations: determining parameter information indicating a current channel occupancy status of the basic service set in which the access point is located;
  • the parameter information received by the receiving circuit 173 may include the number of active nodes in the basic service set, where the processor 171 is specifically configured to determine when the number of active nodes of the basic service set increases or the number of decreases exceeds a threshold.
  • the number of active nodes of the basic service set is the parameter information.
  • the transmitting circuit 174 may also send the idle channel evaluation CCA threshold of the access point to other access points.
  • the transmitting circuit 174 may send a CCA response frame to other access points, where the CCA response frame may include a CCA threshold of the access point.
  • the CCA response frame sent by the transmitting circuit 174 is carried in an access network query protocol element or a common behavior frame.
  • the transmitting circuit 174 may send a CCA request frame to other access points, where the CCA request frame may include the parameter information.
  • the CCA request frame sent by the transmitting circuit 174 may be carried in an access network query protocol element or a common behavior frame.
  • the access point when the parameter information indicating the channel occupancy status of the basic service set in which the access point is located changes, the access point sends the changed parameter information to other access points, so that other access points can be changed according to the change.
  • Parameter information adjust the respective CCA threshold.
  • an embodiment or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” or “an embodiment” means that a particular feature, structure, or characteristic that is associated with an embodiment is included in at least one embodiment of the invention.
  • “in one embodiment” or “in an embodiment” or “an embodiment” does not necessarily mean the same embodiment.
  • these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
  • the size of the sequence numbers of the above processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • system and “network” are often used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or can represent: three cases of existence, simultaneous presence and existence of B alone .
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • B corresponding to A means that B is associated with A, and B can be determined based on A.
  • determining B according to A does not mean that B is only determined according to A, but also can be determined based on A and/or other information.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct engagement or communication connection shown or discussed may be an indirect engagement or communication connection through some interface, device or unit, or may be an electrical, mechanical or other form of connection.
  • the components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure.
  • the desired program code and any other medium that can be accessed by the computer may suitably be a computer readable medium.
  • any connection may suitably be a computer readable medium.
  • coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio, and microwave
  • coaxial Cables, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwaves are included in the fixing of the associated media.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disc, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

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Abstract

本发明实施例提供了一种调整空闲信道评估门限值的方法和接入点。该接入点包括:接收单元,用于接收另一接入点发送的参数信息,该另一接入点发送的参数信息表示该另一接入点所在的基本服务集的当前信道占用状态;调整单元,用于根据该另一接入点发送的参数信息,调整该接入点的空闲信道评估CCA门限值。本发明实施例中接入点根据其他接入点发送的表示当前信道占用状态的参数信息,调整自身的CCA门限值。能够对接入点的CCA门限值进行动态调整,提高通信效率。

Description

调整空闲信道评估门限值的方法和接入点 技术领域
本发明涉及无线通信技术领域, 并且更具体地, 涉及调整空闲信道评估 门限值的方法和接入点。 背景技术
电气和电子工程师协会(简称 IEEE, 英文 Institute of Electrical and Electronics Engineers )标准的 802.11协议釆用载波侦听多址访问 /冲突回避 (简称 CSMA/CA, 英文 Carrier Sense Multiple Access with Collision Avoidance )机制进行信道的退避和竟争。 CSMA/CA机制要求接入点和站点 在发送信号之前都要侦听信道, 以防止碰撞。 接入点和站点侦听信道的方法 有物理载波侦听和虚拟载波侦听。 只有当物理载波侦听和虚拟载波侦听的结 果都表明信道空闲时, 才可以发送信号。
物理载波侦听主要利用空闲信道评估 (简称 CCA, 英文 Clear Channel
Assessment )方法确定信道的状态。 节点需要在信道上发送数据之前进行判 断,如果接收到的有效正交频分复用(简称 OFDM,英文 Orthogonal Frequency Division Multiplexing )传输信号的功率大于等于 CCA门限, 则 CCA方法的 评估结果是信道的状态为忙; 否则, 则认为信道的状态为闲。
目前, 现有 802.11协议中釆用的是固定的 CCA门限值。 例如, 外界恶 意使用信道而导致 CCA方法对信道的评估结果为忙, 会导致网络中的节点 难以竟争到信道。 因此, 固定的 CCA门限值会导致通信效率降低。 发明内容
本发明实施例提供了一种调整空闲信道评估门限值的方法和接入点, 能 够动态调整 CCA门限值。
第一方面, 提供了一种接入点, 该接入点包括: 接收单元, 用于接收另 一接入点发送的参数信息, 该另一接入点发送的参数信息表示该另一接入点 所在的基本服务集的当前信道占用状态; 调整单元, 用于根据该另一接入点 发送的参数信息, 调整该接入点的空闲信道评估 CCA门限值。
结合第一方面, 在第一方面的第一种可能的实现方式中, 该另一接入点 发送的参数信息包括该另一接入点所在的基本服务集的活跃节点个数, 该调 整单元, 具体用于当该另一接入点所在的基本服务集的活跃节点个数大于该 接入点所在的基本服务集的活跃节点个数时,调高该接入点的 CCA门限值; 当该另一接入点所在的基本服务集的活跃节点个数小于该接入点所在的基 本服务集的活跃节点个数时, 调低该接入点的 CCA门限值。
结合第一方面的第一种可能的实现方式,在第一方面的第二种可能的实 现方式中, 该调整单元, 具体用于根据该另一接入点发送的参数信息和其他 参数信息, 调整该接入点的 CCA门限值, 该其他参数信息包括下列信息中 的至少一个: 该接入点所在的基本服务集的站点的位置、 该接入点所在的基 本服务集的站点的发射功率和所述接入点所在的基本服务集的路径损耗。
结合第一方面或第一方面的第一种至第二种可能的实现方式中的任一 种可能的实现方式, 在第一方面的第三种可能的实现方式中, 该接收单元, 还用于接收该另一接入点发送的该另一接入点的 CCA门限值; 其中, 该调 整单元,具体用于根据该另一接入点发送的参数信息和该另一接入点的 CCA 门限值, 调整该接入点的 CC A门限值。
结合第一方面或第一方面的第一种至第三种可能的实施方式中的任一 种可能的实现方式, 在第一方面的第四种可能的实现方式中, 该接入点还包 括: 存储单元, 用于存储 CCA列表, 该 CCA列表包括该接入点的邻近接入 点的标识信息、 该邻近接入点的 CCA门限值和表示该邻近接入点所在的基 本服务集的当前信道占用状态的参数信息。
结合第一方面的第四种可能的实现方式,在第一方面的第五种可能的实 现方式中, 该调整单元, 具体用于根据该 CCA列表的变化情况, 调整该接 入点的 CCA门限值。
结合第一方面的第三种至第五种可能的实现方式中的任一种可能的实 现方式, 在第一方面的第六种可能的实现方式中, 该接入点还包括: 发送单 元, 用于向该接入点的邻近接入点发送该接入点的调整后的 CCA门限值。
结合第一方面或第一方面的第一种至第五种可能的实现方式中的任一 种可能的实现方式, 在第一方面的第七种可能的实现方式中, 该接入点还包 括: 发送单元, 用于向该接入点所在的基本服务集的站点发送指示信息, 该 指示信息用于指示该站点根据该指示信息调整该站点的 CCA门限值。
结合第一方面的第七种可能的实现方式,在第一方面的第八种可能的实 现方式中, 该发送单元发送的该指示信息包括该接入点的调整后的 CCA 门 限值。
结合第一方面或第一方面的第一种至第八种可能的实现方式中的任一 种可能的实现方式, 在第一方面的第九种可能的实现方式中, 该接收单元, 具体用于接收该另一接入点发送的 CCA请求帧,该 CCA请求帧包含该另一 接入点发送的参数信息。
结合第一方面的第九种可能的实现方式,在第一方面的第十种可能的实 现方式中, 该接收单元接收的该 CCA请求帧在访问网络查询协议元素或公 共行为帧中承载。
结合第一方面的第六种可能的实现方式,在第一方面的第十一种可能的 实现方式中, 该发送单元, 具体用于向该邻近接入点发送 CCA响应帧, 该 CCA响应帧包含该接入点的调整后的 CCA门限值。
结合第一方面的第十一种可能的实现方式,在第一方面的第十二种可能 的实现方式中, 该发送单元发送的该 CCA响应帧在访问网络查询协议元素 或公共行为帧中承载。
结合第一方面的第七种或第一方面的第八种可能的实现方式,在第一方 面的第十三种可能的实现方式中, 该发送单元发送的该指示信息在信标帧、 请求发送帧或探测响应帧中承载。
结合第一方面的第十三种可能的实现方式,在第一方面的第十四种可能 的实现方式中, 该信标帧、 该请求发送帧或该探测响应帧包含 CCA调整计 数器字段。
第二方面, 提供了一种接入点, 该接入点包括: 确定单元, 用于确定参 数信息, 该参数信息表示该接入点所在的基本服务集的当前信道占用状态; 发送单元, 用于向其他接入点发送该参数信息。
结合第二方面, 在第二方面的第一种可能的实现方式中, 该参数信息包 括该基本服务集的活跃节点个数, 其中, 该确定单元, 具体用于当该基本服 务集的活跃节点增加的个数或者减少的个数超过门限时,确定该基本服务集 的活跃节点个数为该参数信息。
结合第二方面或第二方面的第一种可能的实现方式,在第二方面的第二 种可能的实现方式中, 该发送单元, 还用于向该其他接入点发送该接入点的 空闲信道评估 CCA门限值。 结合第二方面的第二种可能的实现方式,在第二方面的第三种可能的实 现方式中,该发送单元,具体用于向该其他接入点发送 CCA响应帧,该 CCA 响应帧包含该接入点的 CCA门限值。
结合第二方面的第三种可能的实现方式,在第二方面的第四种可能的实 现方式中, 该发送单元发送的该 CCA响应帧在访问网络查询协议元素或公 共行为帧中承载。
结合第二方面或第二方面的第一种至第四种可能的实现方式中的任一 种可能的实现方式, 在第二方面的第五种可能的实现方式中, 该发送单元, 具体用于向该其他接入点发送 CCA请求帧,该 CCA请求帧包含该参数信息。
结合第二方面的第五种可能的实现方式,在第二方面的第六种可能的实 现方式中, 该发送单元发送的该 CCA请求帧在访问网络查询协议元素或公 共行为帧中承载。
第三方面, 提供了一种调整空闲信道评估门限值的方法, 该方法包括: 接入点接收另一接入点发送的参数信息, 该另一接入点发送的参数信息表示 该另一接入点所在的基本服务集的当前信道占用状态; 该接入点根据该另一 接入点发送的参数信息, 调整该接入点的空闲信道评估 CCA门限值。
结合第三方面, 在第三方面的第一种可能的实现方式中, 该另一接入点 发送的参数信息包括该另一接入点所在的基本服务集的活跃节点个数, 该接 入点根据该另一接入点发送的参数信息, 调整该接入点的 CCA门限值, 包 括: 当该另一接入点所在的基本服务集的活跃节点个数大于该接入点所在的 基本服务集的活跃节点个数时, 该接入点调高该接入点的 CCA门限值; 当 该另一接入点所在的基本服务集的活跃节点个数小于该接入点所在的基本 服务集的活跃节点个数时, 该接入点调低该接入点的 CCA门限值。
结合第三方面的第一种可能的实现方式,在第三方面的第二种可能的 实现方式中, 该接入点根据该另一接入点发送的参数信息, 调整该接入点 的空闲信道评估 CCA门限值, 包括: 该接入点根据该另一接入点发送的 参数信息和其他参数信息, 调整该接入点的 CCA门限值, 该其他参数信 息包括下列信息中的至少一个: 该接入点所在的基本服务集的站点的位 置、该接入点所在的基本服务集的站点的发射功率和该接入点所在的基本 服务集的路径损耗。
结合第三方面或第三方面的第一种至第二种可能的实现方式中的任一 种可能的实现方式, 在第三方面的第三种可能的实现方式中, 该接入点接收 该另一接入点发送的该另一接入点的 CCA门限值, 其中, 该接入点根据该 另一接入点发送的参数信息, 调整该接入点的空闲信道评估 CCA门限值, 包括: 该接入点根据该另一接入点发送的参数信息和该另一接入点的 CCA 门限值, 调整该接入点的 CC A门限值。
结合第三方面或第三方面的第一种至第三种可能的实施方式中的任一 种可能的实现方式,在第三方面的第四种可能的实现方式中,该方法还包括: 该接入点确定 CCA列表,该 CCA列表包括该接入点的邻近接入点的标识信 息、 该邻近接入点的 CCA门限值和表示该邻近接入点所在的基本服务集的 当前信道占用状态的参数信息。
结合第三方面的第四种可能的实现方式,在第三方面的第五种可能的实 现方式中, 该接入点根据该另一接入点发送的参数信息, 调整该接入点的
CCA门限值, 包括: 该接入点根据该 CCA列表的变化情况, 调整该接入点 的 CCA门限值。
结合第三方面的第三种至第五种可能的实现方式中的任一种可能的实 现方式, 在第三方面的第六种可能的实现方式中, 该方法还包括: 该接入点 向该接入点的邻近接入点发送该接入点的调整后的 CCA门限值。
结合第三方面或第三方面的第一种至第五种可能的实现方式中的任一 种可能的实现方式,在第三方面的第七种可能的实现方式中,该方法还包括: 该接入点向该接入点所在的基本服务集的站点发送指示信息, 该指示信息用 于指示该站点 4艮据该指示信息调整该站点的 CCA门限值。
结合第三方面的第七种可能的实现方式,在第三方面的第八种可能的实 现方式中, 该指示信息包括该接入点的调整后的 CCA门限值。
结合第三方面或第三方面的第一种至第八种可能的实现方式中的任一 种可能的实现方式, 在第三方面的第九种可能的实现方式中, 该接入点接收 另一接入点发送的参数信息, 包括: 该接入点接收该另一接入点发送的 CCA 请求帧, 该 CCA请求帧包含该另一接入点发送的参数信息。
结合第三方面的第九种可能的实现方式,在第三方面的第十种可能的实 现方式中, 该 CCA请求帧在访问网络查询协议元素或公共行为帧中承载。
结合第三方面的第六种可能的实现方式,在第三方面的第十一种可能的 实现方式中, 该接入点向该接入点的邻近接入点发送该接入点的调整后的 CCA 门限值, 包括: 该接入点向该邻近接入点发送 CCA响应帧, 该 CCA 响应帧包含该接入点的调整后的 CCA门限值。
结合第三方面的第十一种可能的实现方式,在第三方面的第十二种可能 的实现方式中, 该 CCA响应帧在访问网络查询协议元素或公共行为帧中承 载。
结合第三方面的第七种或第三方面的第八种可能的实现方式,在第三方 面的第十三种可能的实现方式中, 该指示信息在信标帧、 请求发送帧或探测 响应帧中承载。
结合第三方面的第十三种可能的实现方式,在第三方面的第十四种可能 的实现方式中, 该信标帧、 该请求发送帧或该探测响应帧包含 CCA调整计 数器字段。
第四方面, 提供了一种调整空闲信道评估门限值的方法, 该方法包括: 接入点确定参数信息, 该参数信息表示该接入点所在的基本服务集的当前信 道占用状态; 该接入点向其他接入点发送该参数信息。
结合第四方面, 在第四方面的第一种可能的实现方式中, 该参数信息包 括该基本服务集的活跃节点个数, 其中, 该接入点确定参数信息, 包括: 当 该基本服务集的活跃节点增加的个数或者减少的个数超过门限时,确定该基 本服务集的活跃节点个数为该参数信息。
结合第四方面或第四方面的第一种可能的实现方式,在第四方面的第二 种可能的实现方式中, 该方法还包括: 该接入点向该其他接入点发送该接入 点的空闲信道评估 CCA门限值。
结合第四方面的第二种可能的实现方式,在第四方面的第三种可能的实 现方式中, 该方法还包括: 该接入点向该其他接入点发送该接入点的空闲信 道评估 CCA门限值, 包括: 该接入点向该其他接入点发送 CCA响应帧, 该 CCA响应帧包含该接入点的 CCA门限值。
结合第四方面的第三种可能的实现方式,在第四方面的第四种可能的实 现方式中, 该 CCA响应帧在访问网络查询协议元素或公共行为帧中承载。
结合第四方面或第四方面的第一种至第四种可能的实现方式中的任一 种可能的实现方式, 在第四方面的第五种可能的实现方式中, 该接入点向其 他接入点发送该参数信息, 包括: 该接入点向该其他接入点发送 CCA请求 帧, 该 CCA请求帧包含该参数信息。 结合第四方面的第五种可能的实现方式,在第四方面的第六种可能的实 现方式中, 该 CCA请求帧在访问网络查询协议元素或公共行为帧中承载。
本发明实施例中接入点根据其他接入点发送的表示信道占用状态的参 数信息, 调整自身的 CCA门限值。 能够对接入点的 CCA门限值进行动态调 整, 提高通信效率。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对本发明实施例中 所需要使用的附图作简单地介绍, 显而易见地, 下面所描述的附图仅仅是本 发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的 前提下, 还可以根据这些附图获得其他的附图。
图 1是可应用本发明实施例的场景的示意图。
图 2是本发明一个实施例的接入点的框图。
图 3是本发明另一实施例的接入点的框图。
图 4是本发明一个实施例的 CCA请求帧的示意图。
图 5是本发明一个实施例的 CCA响应帧的示意图。
图 6是本发明另一实施例的 CCA请求帧的示意图。
图 7是本发明另一实施例的 CCA响应帧的示意图。
图 8是本发明一个实施例的信标帧的示意图。
图 9是本发明一个实施例的请求发送帧的示意图。
图 10是本发明一个实施例的探测响应帧的示意图。
图 11是本发明一个实施例的接入点的框图。
图 12是本发明一个实施例的调整 CCA门限值的方法的示意性流程图。 图 13是本发明另一实施例的调整 CCA门限值的方法的示意性流程图。 图 14是本发明另一实施例的调整 CCA门限值的方法的示意性流程图。 图 15是本发明一个实施例的调整 CCA门限值的方法的过程的示意性流 程图。
图 16是本发明另一实施例的接入点的框图。
图 17是本发明另一实施例的接入点的框图。 具体实施方式 下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例是本发明的一部分实施例, 而不 是全部实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做出创 造性劳动的前提下所获得的所有其他实施例, 都应属于本发明保护的范围。
应理解,本发明实施例的技术方案可以应用于各种无线通信系统,例如: 基于无线保真(简称 WIFI ,英文 Wireless Fidelity )、蓝牙(英文 Bluetooth )、 及全球微波互联接入(简称 WIMAX, 英文 Worldwide Interoperability for Microwave Access, ), 无线局域网鉴别和保密基础结构 (简称 WAPI , 英文 Wireless LAN Authentication and Privacy Infrastructure )等等系统以及其它将 终端以无线方式互相连接的通信系统。
接入点 (简称 AP, 英文 Access Point ), 也可称之为无线访问接入点或 热点等, 其可以接入通信网络。 接入点与无线网络的交换机相连, 也是无线 网络的核心。 AP是移动计算机用户进入有线网络的接入点, 主要用于宽带 家庭、 大楼内部以及园区内部, 典型距离覆盖几十米至上百米, 目前主要技 术为 802.11系列。 AP相当于一个连接有线网和无线网的桥梁, 其主要作用 是将各个无线网络客户端连接到一起, 然后将无线网络接入以太网。
站点 (简称 STA, 英文 Station ), 可以是无线传感器、 无线通信终端或 移动终端, 如支持 WiFi通讯功能的移动电话(或称为"蜂窝"电话)和具有 无线通信功能的计算机, 例如, 可以是支持 WiFi通讯功能的便携式、 袖珍 式、 手持式、 计算机内置的或者车载的无线通信装置, 它们与无线接入网交 换语音和 /或数据。
图 1是可应用本发明实施例的场景的示意图。
本发明实施例可以应用于无线局域网, 无线局域网可以为包含接入点的 基本服务集(简称 BSS, 英文 Basic Service Set )。 应理解, 在 WiFi系统的 基础网络结构下, 网络中可以包括多个基本服务集, 每个基本服务集可以包 含一个接入点和多个归属于该接入点的站点。该接入点和站点可以统称为节 点。
如图 1所示,可应用本发明实施例的无线局域网可以包括多个基本服务 集。每个基本服务集包括一个 AP和归属该 AP的多个 STA。 例如 AP 1和归 属该 AP 1的 STA 1和 STA 2。 AP 2和归属该 AP 2的 STA 3和 STA 4等等。
基本服务集可以包括多种参数。基本服务集包含的参数中的部分参数可 以影响本基本服务集中的节点和其他基本服务集中的节点的空闲信道评估
CCA门限值。 由于 CCA门限值用来评估信道的占用状态, 因而该部分参数 可以用来表示信道占用状态。 基本服务集中的该部分参数可以如: 基本服务 集的活跃节点的个数、 基本服务集的站点的发送功率、 基本服务集的站点的 位置信息和基本服务集的路径损耗等。
图 2是本发明一个实施例的接入点的框图。无线局域网中可以包括多个 基本服务集和对应的多个接入点。 图 2所示的接入点 20可以为多个接入点 中的任一接入点。 如图 2所示, 该接入点 20可以包括接收单元 21和调整单 元 22。
接收单元 21用于接收另一接入点发送的参数信息, 该另一接入点发送 的参数信息表示该另一接入点所在的基本服务集的当前信道占用状态; 调整单元 22用于根据该另一接入点发送的参数信息,调整接入点 20的 空闲信道评估 CCA门限值。
本发明实施例中接入点根据其他接入点发送的表示信道占用状态的参 数信息, 调整自身的 CCA门限值。 能够对接入点的 CCA门限值进行动态调 整, 提高通信效率。
应理解, 一个基本服务集可以包含一个接入点。 无线局域网可以包括多 个基本服务集和对应的多个接入点。本发明实施例中仅对多个接入点中的某 一个接入点进行描述。 应理解, 对于无线局域网中可以侦听到另一接入点发 送的参数信息的每一个接入点均可以釆用本发明实施例中的方法调整各自 的 CCA门限值。
另一接入点所在的基本服务集包含的参数信息中的部分参数信息可以 影响接入点 20的 CCA门限值。 由于 CCA门限值可以用来评估信道占用状 态, 因而该另一接入点发送的参数信息可以用来表示另一接入点所在的基本 服务集的当前信道占用状态。 具体地, 另一接入点可以在其所在的基本服务 集的参数信息变化时, 向其他接入点发送当前已经变化的参数信息。
无线局域网中可以有多个基本服务集的多个参数信息进行变化。 应理 解, 在某个时刻, 无线局域网中只允许传输一个基本服务集的参数信息。 因 此, 本发明实施例中的对某个接入点来描述是针对某个时刻而言, 实际上, 在其他时刻,接入点 20的接收单元 21也可以接收其他接入点发送的参数信 息。 为方便描述, 本发明实施例只针对某一时刻接收一个接入点发送的参数 信息的情况进行描述。
应理解, 另一接入点发送的参数信息可以包括以下至少一个可以表示另 一接入点所在的基本服务集的当前信道占用状态的参数。 例如: 另一接入点 所在的基本服务集的活跃节点的个数或另一接入点所在的基本服务集的站 点的发送功率等。 即调整单元 22可以根据至少一个参数, 调整接入点 20的 CCA 门限值。 应理解, 若另一接入点所在的基本服务集的活跃节点个数变 化时, 该另一接入点发送的参数信息可以包括该另一接入点所在的基本服务 集的当前活跃节点个数。
可选地, 本发明实施例对调整单元 22如何根据另一接入点发送的参数 信息调整接入点的 CCA门限值的方法不做限定。 接入点需要根据另一接入 点发送的参数信息调整该接入点的 CCA门限值的方法均落入本发明实施例 中。 例如, 本发明实施例的接入点可以根据另一接入点发送的参数信息, 基 于不同的调整算法, 将另一接入点发送的参数信息作为输入, 运算得出新的 CCA门限值。 接入点可以调整该接入点的 CCA门限值为该新的 CCA门限 值。 本发明实施例的接入点也可以根据另一接入点发送的参数信息, 确定 CCA门限值的调整粒度, 并可以根据此 CCA门限值的调整粒度多次调高或 调低该接入点的 CCA门限值, 最终使得基本服务集中的接入点和站点可以 正常通信。
可选地, 作为另一实施例, 在接收到另一接入点发送的参数信息的多个 接入点中,若有部分接入点判断该另一接入点发送的参数信息不足以影响该 部分接入点的 CCA门限值,该部分接入点的调整单元可以将 CCA门限值的 调整量设为零, 即该部分接入点的 CCA门限值可以不发生变化。
可选地, 作为另一实施例, 调整单元 22可以根据另一接入点发送的参 数信息和接入点 20所在的基本服务集中与该另一接入点发送的参数信息相 应的参数信息, 调整接入点 20的 CCA门限值。
具体地, 另一接入点发送的参数信息的类别和接入点所在的基本服务集 中与该另一接入点发送的参数信息相应的参数信息的类别可以相同。 例如, 另一接入点发送的参数信息可以包括另一接入点所在的基本服务集的活跃 节点个数和站点的发送功率, 相应地, 接入点所在的基本服务集中与该另一 接入点发送的参数信息相应的参数信息也可以包括接入点所在的基本服务 集的活跃节点个数和站点的发送功率。 可选地, 作为另一实施例, 本发明实施例中接入点 20可以比较另一接 入点发送的参数信息和接入点所在的基本服务集中与该另一接入点发送的 参数信息相应的参数信息, 并根据对比结果调整接入点 20的 CCA门限值; 也可以将另一接入点发送的参数信息和接入点所在的基本服务集中与该另 一接入点发送的参数信息相应的参数信息进行算法运算, 并根据运算结果调 整接入点 20的 CCA门限值。 应理解, 本发明实施例对如何根据另一接入点 发送的参数信息和接入点所在的基本服务集中与该另一接入点发送的参数 信息相应的参数信息调整接入点 20的 CCA门限值的方法不做限定。
可选地, 作为另一实施例, 另一接入点发送的参数信息可以包括另一接 入点所在的基本服务集的活跃节点个数。 本接入点 20所在基本服务集为接 入点所在的基本服务集。 应理解, 基本服务集中可以具有活跃节点的增加门 限和减少门限。 当活跃节点个数的增加量超过该增加门限或活跃节点个数的 减少量超过该减少门限时,该活跃节点个数会影响自身或其他接入点的 CCA 门限值。 本发明实施例中, 当另一接入点所在的基本服务集的活跃节点个数 大于接入点所在的基本服务集的活跃节点个数时, 调整单元 22可以调高接 入点 20的 CCA门限值; 当另一接入点所在的基本服务集的活跃节点个数小 于接入点所在的基本服务集的活跃节点个数时, 调整单元 22可以调低接入 点 20的 CCA门限值。
可选地, 作为另一实施例, 接入点 20可以根据另一接入点所在的基本 服务集的活跃节点个数与接入点所在的基本服务集的活跃节点个数的差值 确定 CCA门限值的调整粒度。 调整单元 22可以基于该 CCA门限值的调整 粒度, 调高或调低该接入点 20的 CCA门限值。
应理解, 当其他接入点的活跃节点个数增加时, 该活跃节点可能会占用 大部分信道。 若接入点继续使用原先的 CCA门限, 则 CCA方法的结果会显 示信道的状态为忙。 此时, 接入点需要调高该接入点的 CCA门限值, 使得 CCA 方法的结果显示信道的状态为闲, 以便于保证接入点和站点的正常通 信。 相反地, 当其他接入点的活跃节点个数减少时, 接入点可以调低该接入 点的 CCA门限值。
可选地, 作为另一实施例, 接入点 20根据活跃节点个数的变化对接入 点的 CCA门限值进行调整时还可以参考其他参数信息。调整单元 22可以根 据另一接入点发送的参数信息和其他参数信息,调整接入点 20的 CCA门限 值, 可选地, 该其他参数信息可以包括下列信息中的至少一个: 接入点所在 的基本服务集的站点的位置、该接入点所在的基本服务集的站点的发射功率 和所述接入点所在的基本服务集的路径损耗。 应理解, 该路径损耗可以为该 基本服务集中每条链路的每个路径损耗,也可以为该基本服务集中所有链路 的每个路径损耗的总和。
具体地, 调整单元 22可以通过对比另一接入点所在的基本服务集的活 跃节点个数和接入点所在的基本服务集的活跃节点个数, 定性地确定调高或 者调低接入点 20的 CCA门限值。 可选地, 本发明实施例中调整单元 22在 定性调高或调低接入点 20的 CCA门限值时, 还可以参考其他参数信息。 即 调整单元 22还可以参考其他参数信息, 定量地调整接入点的 CCA门限值。
可选地, 作为另一实施例, 调整单元 22可以根据接入点所在的基本服 务集的站点的位置, 定量地调整接入点的 CCA门限值。 当本基本月良务集内 接入点和站点的距离越长, CCA门限值越低, 即调低 CCA门限值的调整量 越大; 当本基本服务集内接入点和站点的距离越短, CCA 门限值越高, 即 调高 CCA门限值的调整量越大。
可选地, 作为另一实施例, 调整单元 22可以根据接入点所在的基本服 务集的站点的发射功率, 定量地调整接入点的 CCA门限值。 当本基本服务 集内接入点和站点的发射功率越小, CCA门限值越低, 即调低 CCA门限值 的调整量越大; 当本基本服务集内接入点和站点的发射功率越大, CCA 门 限值越高, 即调高 CCA门限值的调整量越大。
可选地, 作为另一实施例, 调整单元 22可以根据接入点所在的基本服 务集的路径损耗, 定量地调整接入点的 CCA门限值。 当本基本服务集的路 径损耗越小, CCA门限值越高, 即调高 CCA门限值的调整量越大; 当本基 本服务集内接入点和站点的路径损耗越大, CCA门限值越低即调低 CCA门 限值的调整量越大。
可选地, 根据其他参数信息, 接入点可以通过算法计算得出接入点的新 的 CCA门限值。 应理解, 对于具体将 CCA门限值调整到的何值, 不同的算 法和调整方法会得出不同的门限值。本发明实施例对接入点如何调整该接入 点的 CCA门限值到某一门限值的具体方法并不做限定。
可选地, 作为另一实施例, 接收单元 21还可以用于接收该另一接入点 发送的该另一接入点的 CCA门限值, 其中, 调整单元 22可以具体用于根据 该另一接入点发送的参数信息和该另一接入点的 CCA门限值, 调整该接入 点 20的 CCA门限值。 应理解, 调整单元 22在根据另一接入点发送的参数 信息调整接入点的 CCA门限值时,还可能参考该另一接入点的 CCA门限值 来进行调整。
应理解, 另一接入点与接入点 20相类似。 因此, 类比于接入点 20, 另 一接入点也可以调整该另一接入点的 CCA 门限值。 另一接入点对自身的 CCA门限值调整的方法可以与接入点 20调整自身 CCA门限值的方法相同。 在接入点 20进行 CCA门限值调整之前,另一接入点可以在其他时刻按照接 入点 20的方法对另一接入点的 CCA门限值进行调整。 因而, 该另一接入点 发送的参数信息包括的另一接入点的 CCA门限值可以为其他时刻进行调整 后的 CCA门限值。
本发明实施例中接入点可以根据其他接入点的表示信道占用状态的参 数信息和 CCA门限值, 调整接入点的 CCA门限值。基于其他接入点的参数 信息和 CCA门限值, 可以获取更多的参考信息, 提高调整接入点的 CCA门 限值的准确性。
图 3是本发明另一实施例的接入点的框图。 如图 3所示, 该接入点 20 还可以包括存储单元 23。为方便理解, 图 3中与图 2中相同的设备釆用的名 称和标号与图 2中的设备釆用的名称和标号相同。
存储单元 23用于存储 CCA列表, 该 CCA列表包括该接入点的邻近接 入点的标识信息、 邻近接入点的 CCA门限值和表示邻近接入点所在的基本 服务集的当前信道占用状态的参数信息。
应理解, 本领域普通技术人员可以得知, 该接入点的邻近接入点可以为 除了该接入点的其他接入点中可以侦听到该接入点发送的信息的接入点。 本 发明实施例中的接入点可以接收到另一接入点发送的信息, 该另一接入点可 以为邻近接入点中的一个接入点。
因此,接入点 20将接收单元 21接收的另一接入点发送的参数信息存储 在 CCA列表中。从上述描述可知, 当有多个接入点的参数信息和 CCA门限 值发生变化, 可以在不同时刻分别向其他接入点发送该变化后的参数信息和 CCA门限值。 因此, 该 CCA列表中可以包括多个接入点当前的参数信息和 CCA门限值。也就是说,邻近接入点的参数信息和 CCA门限值发生变化时, 该邻近接入点均可以类比另一接入点向其他接入点发送当前的参数信息和 CCA门限值。
可见,接入点 20可以将另一接入点发送的参数信息存储在 CCA列表中, 也可以将其他接入点的参数信息和 CCA 门限值记录在 CCA列表中。 CCA 列表中的邻近接入点的 CCA门限值可以包括邻近接入点中部分接入点的变 化后的 CCA门限值,也可以包括其余接入点的没有发生变化的 CCA门限值。 CCA 列表中的邻近接入点的参数信息可以包括邻近接入点中部分接入点的 变化后的参数信息, 也可以包括其余接入点的没有进行变化的参数信息。
具体地, 多个基本服务集中的每个接入点均可以具有 CCA列表。 CCA 列表中的邻近接入点的标识信息可以用于标识不同的接入点。 CCA 列表中 的邻近接入点的 CCA门限值和邻近接入点的参数信息可以包括接收单元 21 从另一接入点和其他接入点接收的信息。
可选地, 作为另一实施例, 调整单元 22可以根据所述 CCA列表的变化 情况, 调整接入点 20的 CCA门限值。
具体地, 作为一个实施例, 接入点 20的调整单元 22可以基于 CCA列 表中一部分发生变化的参数信息, 调整接入点 20的 CC A门限值。 例如, 调 整单元 22可以根据发生变化的活跃节点个数来调整 CCA门限值, 同时并可 以参考接入点 20所在的基本服务集的站点的位置、 该基本服务集的站点的 发射功率和该基本服务集的路径损耗等信息对该接入点 20的 CCA门限值进 行调整。
可选地, 作为另一实施例, 调整单元 22可以根据接入点所在的基本服 务集的站点的位置, 定量地调整接入点的 CCA门限值。 当本基本月良务集内 接入点和站点的距离越长, CCA门限值越低, 即调低 CCA门限值的调整量 越大; 当本基本服务集内接入点和站点的距离越短, CCA 门限值越高, 即 调高 CCA门限值的调整量越大。
可选地, 作为另一实施例, 调整单元 22可以根据接入点所在的基本服 务集的站点的发射功率, 定量地调整接入点的 CCA门限值。 当本基本服务 集内接入点和站点的发射功率越小, CCA门限值越低, 即调低 CCA门限值 的调整量越大; 当本基本服务集内接入点和站点的发射功率越大, CCA 门 限值越高, 即调高 CCA门限值的调整量越大。
可选地, 作为另一实施例, 调整单元 22可以根据接入点所在的基本服 务集的路径损耗, 定量地调整接入点的 CCA门限值。 当本基本服务集的路 径损耗越小, CCA门限值越高, 即调高 CCA门限值的调整量越大; 当本基 本服务集内接入点和站点的路径损耗越大, CCA门限值越低即调低 CCA门 限值的调整量越大。
可选地, 作为另一实施例, 本发明实施例中接入点 20的调整单元 22也 可以将 CCA列表中一部分发生变化的 CCA门限值作为判定的标准。 例如, 若 CCA列表中邻近接入点的发生变化的 CCA门限值大于接入点 20自身的 CCA门限值, 调整单元 22可以调高接入点 20的 CCA门限值; 若 CCA列 表中邻近接入点的发生变化的 CCA门限值小于接入点 20自身的 CCA门限 值, 调整单元 22可以调低接入点 20的 CCA门限值。
可选地, 作为另一实施例, 调整单元 22也可以同时基于发生变化的参 数信息和发生变化的 CCA门限值, 调整接入点 20的 CC A门限值。 例如, 接入点 20的调整单元 22可以基于 CCA列表中发生变化的参数信息为基准, 定性地调高或者调低 CCA门限值, 再参考 CCA列表中变化后的 CCA门限 值, 定量来确定具体调高或者调低到的某一 CCA门限值。
可选地, 作为另一实施例, 本发明实施例中调整单元 22还可以将变化 后的参数信息和变化后的 CCA门限值同时作为输入值, 基于某种算法计算 得出接入点 20的新的 CCA门限值,并调整接入点 20的 CCA门限值为该新 的 CCA门限值。
可选地, 作为另一实施例, 本发明实施例中接入点 20的调整单元 22还 可以将 CCA列表中所有邻近接入点的参数信息和所有邻近接入点的 CCA门 限值都作为输入值, 基于某种算法计算得出接入点 20的新的 CCA门限值, 并调整接入点 20的 CCA门限值为该新的 CCA门限值。 可选地, 本发明实 施例对接入点调整该接入点的 CCA门限值的调整方法并不限于此。
可选地, 作为另一实施例, 接入点 20还可以包括发送单元 24, 该发送 单元 24用于向接入点 20的邻近接入点发送接入点 20的调整后的 CCA门限 值。
基本服务集中的每个接入点调整自身 CCA门限值后, 可以将调整后的 CCA 门限值发送到该每个接入点的邻近接入点。 邻近接入点接收到调整后 的 CCA门限值, 可以存储在各自的 CCA列表中。 邻近接入点中的每个接入 点在不同时刻接收到的多个接入点发送的变化后的 CCA门限值可以构成该 每个接入点各自的 CCA列表中的邻近接入点的 CCA门限值。 具体地, CCA列表可以包括邻近接入点的 CCA门限值和邻近接入点的 参数信息。 接入点 20的发送单元 24可以将调整后的 CCA门限值发送到邻 近接入点, 邻近接入点的每个接入点将该调整后的 CCA门限值存储在各自 的 CCA列表中。 在其他时刻, 邻近接入点的每个接入点还可以接收其他接 入点发送的参数信息。 由此, 该 CCA门限值和该参数信息构成了每个接入 点的 CCA列表中邻近接入点的 CCA门限值。
本发明实施例中接入点同时根据邻近接入点发送的参数信息和 CCA门 限值, 调整自身的 CCA门限值, 提高调整 CCA门限值的准确性。 本发明实 施例能够准确地对接入点的 CCA门限值进行动态调整, 提高通信效率。
可选地, 作为另一实施例, 接入点 20的发送单元 24还可以向接入点所 在的接入点所在的基本服务集中的站点发送指示信息, 该指示信息用于指示 该站点根据该指示信息调整该站点的 CCA门限值。
参考图 1, 网络中有多个基本服务集。 本发明实施例接入点的 CCA 门 限值调整后, 进而可以调整该接入点所在的基本服务集中的站点的 CCA 门 限值。 应理解, 网络中的每个基本服务集中的接入点都可以在调整自身的 CCA门限值之后,分别调整各自所在的基本服务集中的站点的 CCA门限值。
参考图 1, 基本服务集中有多个站点。 应理解, 本发明实施例中的接入 点可以对该基本服务集中的所有站点的 CCA门限值进行调整, 也可以对基 本服务集中的部分站点的 CCA门限值进行调整。 本发明并不限于此。
可选地, 作为一个实施例, 本发明实施例中接入点 20可以根据该接入 点 20的调整后的 CCA门限值, 确定所有站点或部分站点的新的 CCA门限 值, 并调整该所有站点或部分站点的 CCA门限值为该新的 CCA门限值。
可选地, 作为另一实施例, 在某些特殊情况, 接入点 20还可以调整个 别站点的 CCA门限, 使得该个别站点可以并发通信。 本发明实施例对接入 点如何调整站点的 CCA门限值的方法并不做限定。
可选地, 指示信息可以由数据帧表示。 发送单元 24可以向接入点 20所 在的基本服务集中的站点发送该指示信息。该指示信息可以包括站点需要调 整到的新的 CCA门限值。站点可以根据该指示信息调整自身的 CCA门限值 为该新的 CCA门限值。
可选地, 作为另一实施例, 接入点 20可以将自身调整后的 CCA门限值 作为所在的基本服务集的站点的新的 CCA门限值。 其中, 该指示信息可以 包括该接入点 20的调整后的 CCA门限值。 此时, 接入点 20所在的基本服 务集的全部站点可以调整自身的 CCA门限值为接入点 20的调整后的 CCA 门限值。
本发明实施例中接入点根据其他接入点发送的参数信息和 CCA 门限 值, 调整自身的 CCA门限值。接入点能够对接入点的 CCA门限值进行动态 调整, 提高通信效率。
另外,本发明实施例中的接入点既可以在基本服务集之间调整接入点的 CCA门限值, 又可以在基本服务集内部调整站点 CCA门限值。 这样, 接入 点通过分层调整网络中的所有节点的 CCA门限值, 能够把复杂的调整算法 只运行在接入点, 站点仅需要配合接入点进行 CCA门限值的调整。 本发明 实施例可以减少运算开销, 并提高节点的 CCA门限值调整过程的灵活性和 准确性。
可选地,作为另一实施例,接收单元 21可以接收另一接入点发送的 CCA 请求帧, 该 CCA请求帧包含另一接入点发送的参数信息。
可选地, 作为另一实施例, 接收单元 21接收的 CCA请求帧可以在访问 网络查询协议元素 (简称 ANQP-element , 英文 Access Network Query Protocol-element )或公共行为帧 (英文 Public Action Frame ) 中承载。
下面结合图 4, 对 CCA请求帧的格式进行描述。
图 4是本发明一个实施例的 CCA请求帧的示意图。
访问网络查询协议元素可以包括信息标识(简称 Info ID )字段、长度(英 文 Length )字段和信息(英文 Information )字段。 可选地, 作为一个实施例, 如图 4 中, CCA请求帧也可以包括信息标识字段、 长度字段和表示邻近接 入点的基本服务集的信道占用状态的参数信息字段。访问网络查询协议元素 中的信息字段可以对应 CCA请求帧中的参数信息字段。在本发明实施例中, CCA请求帧中的参数信息字段可以用来承载另一接入点发送的参数信息。
信息标识字段可以占用两个字节。 对于 CCA请求帧, 该信息标识字段 可以取未被使用的数值, 例如该信息标识字段可以取值为 254。 该信息标识 字段的取值为 254时, 表明该帧是 CCA请求帧。 长度字段可以占用两个字 节。 长度字段可以用来表示该帧的长度。 参数信息字段占用的字节数可以是 固定的, 也可以为可变的。 例如, 当参数信息字段承载的另一接入点发送的 参数信息为活跃节点个数时, 该参数信息字段的长度可以为 2个字节。 应理 解, 当参数信息字段承载的另一接入点发送的参数信息为其他参数时, 该参 数信息字段的长度可以为其他字节数。
可选地, 作为另一实施例, 发送单元 24可以向接入点 20的邻近接入点 发送 CCA响应帧,该 CCA响应帧包含该接入点 20的调整后的 CCA门限值。
可选地, 作为另一实施例, 发送单元 24发送的 CCA响应帧可以在访问 网络查询协议元素或公共行为帧中承载。
下面结合图 5, 对 CCA响应帧的格式进行描述。
图 5是本发明一个实施例的 CCA响应帧的示意图。
访问网络查询协议元素可以包括信息标识(简称 Info ID )字段、长度(英 文 Length )字段和信息(英文 Information )字段。 可选地, 作为一个实施例, 如图 5中, CCA响应帧也可以包括信息标识字段、 长度字段和 CCA 门限值 (英文 CCA Threshold )字段。 访问网络查询协议元素中的信息字段可以对 应 CCA响应帧中的 CCA 门限值字段。 其中, 本发明实施例中的 CCA 门限 值字段可以用来承载接入点的调整后的 CCA门限值。
信息标识字段可以占用两个字节。 对于 CCA响应帧, 该信息标识字段 可以取未被使用的数值, 例如信息标识字段可以取值 255。 即该信息标识字 段的取值为 255时, 表明该帧是 CCA响应帧。 该长度字段可以占用两个字 节。 长度字段可以用来表示该帧的长度。 CCA 门限值字段占用的字节数可 以为固定的, 也可以为可变的。 对于 CCA门限值字段, 釆用不同的量化方 式, 占用的字节数也会不同。
如下表 1所示, 为 CCA门限值的量化表。
CCA门限值量化表
Figure imgf000019_0001
-67dBm 100
-64dBm 101
-61dBm 110
-58dBm 111 如表 1所示,本发明实施例可以给定 CCA门限值的调整范围为 [-82dBm, -58dBm] , CCA门限值的调整粒度可以为 3dB。若釆用表 1所示的量化方式, CCA门限值字段可以占用 3个比特(英文 bit )。 可选地, 本发明实施例对 CCA门限值的量化过程不做限定。 CCA门限值的调整范围可以使用其他范 围, CC A门限值的调整粒度也可以取其他值。 若 CC A门限值的调整范围和 CCA门限值的调整粒度变化, CCA门限值字段可以占用的比特(bit )数也 随之变化。
本发明实施例中在现有的访问网络查询协议元素中承载 CCA请求帧和 CCA响应帧, 简化操作, 易于实现。
可选地, 作为另一实施例, 接收单元 21接收的 CCA请求帧或发送单元
24发送的 CCA响应帧可以在公共行为帧中承载。 下面结合图 6和图 7, 分 别对 CCA请求帧和 CCA响应帧进行具体描述。
图 6是本发明另一实施例的 CCA请求帧的示意图。
公用行为帧包括类别 (英文 Category ) 字段和行为细节 (英文 Action details )字段。 行为细节字段可以再次划分为多个字段。 类别字段占用 1个 字节。 可选地, 作为一个实施例, 如图 6 中, CCA请求帧可以包括类别字 段、 公共行为 (英文 Public Action )字段和参数信息字段。 参数信息字段可 以用来承载另一接入点发送的参数信息。
对于 CCA请求帧, 类别字段可以取值为 4, 公共行为字段可以取值为 16。 若公共行为字段取值为 16时, 可以认为该帧为 CCA响应帧。 参数信息 字段占用的字节数可以是固定的, 也可以为可变的。 例如, 到那个参数信息 字段承载的另一接入点发送的参数信息为活跃节点个数时,该参数信息字段 的长度可以为 2个字节。 应理解, 当参数信息字段承载的另一接入点发送的 参数信息为其他参数时, 该参数信息字段的长度可以为其他字节数。 图 7是本发明另一实施例的 CCA响应帧的示意图。
公共行为帧包括类别字段和行为细节字段。行为细节字段可以再次划分 为多个字段。 类别字段占用 1个字节。 可选地,作为一个实施例。如图 7中, CCA响应帧可以包括类别字段、 公共行为字段和 CCA 门限值(英文 CCA Threshold )字段。其中, CCA 门限值字段可以用来承载接入点调整后的 CCA 门限值。
对于 CCA响应帧, 类别字段可以取值为 4, 公共行为字段可以取其他 未被使用的数值。 若公共行为字段取值为该数值时, 可以认为该帧为 CCA 响应帧。 CCA 门限值字段占用的字节数可以是固定的, 也可以为可变的。 对于 CCA 门限值字段, 釆用不同的量化方式, 占用的字节数也会不同。 若 釆用上文中表 1 的量化方式, CCA 门限值可以占用 3个比特(bit )。 对于 CCA门限值字段,釆用不同的量化方式, 占用的字节数也会不同。即若 CCA 门限值的调整范围和 CCA门限值的调整粒度发生变化, CCA门限值字段可 以占用的比特数也随之变化。
可选地, 作为另一实施例, 发送单元 24发送的指示信息可以在信标帧、 请求发送帧或探测响应帧中承载。
接入点可以统一调整第一服务集中所有站点的 CCA门限值, 也可以针 对性地调整部分站点的 CCA门限值, 本发明并不限于此。 站点可以接收到 该指示信息, 并可以根据该指示信息包含的 CCA门限值, 调整自身的 CCA 门限值。
可选地, 作为另一实施例, 信标(英文 Beacon ) 帧、 请求发送(简称 RTS , 英文 Request To Send ) 帧或探测响应 (英文 Probe Response ) 帧中可 以包含 CCA调整计数器字段。 站点可以根据信标帧、 请求发送帧或探测响 应帧中包含的该 CCA调整计数器字段, 定时调整该站点的 CCA门限值。
下面结合图 8-图 10分别对指示信息承载在不同的数据帧中的情况进行 具体描述。
图 8是本发明一个实施例的信标帧的示意图。
如图 8所示, 信标帧可以包括信标帧体 (英文 Beacon frame body )字段 和 CCA门限值字段。 可选地, 该 CCA门限值字段可以放在信标帧的帧尾。
可选地, 作为另一实施例, 信标帧中还可以包含 CCA调整计数器字段。 该 CCA调整计数器字段可以位于 CCA门限值字段旁,也可以放在信标的帧 尾。
图 9是本发明一个实施例的请求发送帧的示意图。
如图 9所示, RTS帧可以包括帧控制(英文 Frame Control )字段、 持续 时间 (英文 Duration )字段、 接收端地址(简称 RA, 英文 Receiver Address ) 字段、 发送端地址(简称 TA, 英文 Transmission Address )字段、 帧校验序 歹 |J (简称 FCS, 英文 Frame Check Sequence )字段和 CCA门限值字段。 可选 地, 该 CCA门限值字段可以放在 RTS帧中的任意两个字段之间, 例如可以 放在 TA字段和 FCS字段之间, 也可以放在 RTS帧的帧尾。 本发明实施例 对 CCA门限值字段处于 RTS帧中的位置不做限定。
可选地, 作为另一实施例, RTS帧还可以包含 CCA调整计数器 (英文
CCA Adjust Counter ) 字段。 该 CCA调整计数器字段可以位于 CCA门限值 字段旁, 也可以位于 RTS帧中的其他位置。 本发明并不限于比。
图 10是本发明一个实施例的探测响应帧的示意图。
如图 10所示,探测响应帧可以包括探测响应帧体(英文 Probe Response frame body )字段和 CCA门限值(英文 CCA Threshold ) 字段。 可选地, 作 为一个实施例, 该 CCA门限值字段可以放在探测响应帧的帧尾。
可选地, 作为另一实施例, 探测响应帧中还可以包含 CCA调整计数器 字段。 该 CCA调整计数器字段可以位于 CCA 门限值字段旁。
应理解,如图 8-图 10中包括的 CCA调整计数器字段用于指示站点按照 指示的时间进行 CCA门限值调整。 为保证站点同步性, 可以在 CCA调整计 数器字段设置合适的值。 例如, 在图 8所示的信标帧中给定 CCA调整计数 器字段的值为 5, 则要求站点在收到当前信标帧后的第 5个信标帧后开始调 整自身的 CCA门限值。 由此, 站点可以包括定时器模块, 用来根据该 CCA 调整计数器字段, 可以定时调整站点的 CCA门限值, 使得多个站点可以进 行同步调整。
图 11是本发明一个实施例的接入点的框图。 如图 11所示, 接入点 110 可以与图 2中的接入点 20进行交互。 接入点 110可以包括确定单元 111和 发送单元 112。
确定单元 111用于确定参数信息, 该参数信息表示该接入点 110所在的 基本服务集的当前信道占用状态;
发送单元 112用于向其他接入点发送该参数信息。 本发明实施例中接入点向其他接入点发送表示接入点所在的基本服务 集的当前信道占用状态的参数信息, 以便于其他接入点根据该参数信息, 调 整各自的 CCA门限值。
应理解, 一个基本服务集可以包含一个接入点。 无线局域网可以包括多 个基本服务集和对应的多个接入点。本发明实施例中仅对多个接入点中的某 一个接入点进行描述。 应理解, 无线局域网中的每一个接入点均可以向其他 接入点发送表示该接入点所在的基本服务集的当前信道占用状态的参数信 息。
接入点 110所在的基本服务集包含的参数信息中的部分参数信息可以影 响其他接入点的 CCA门限值。由于 CCA门限值可以用来评价信道占用状态, 因而该部分参数信息可以用来表示基本服务集的当前信道占用状态。 具体 地, 接入点 110可以在参数信息变化时, 向其他接入点发送当前已经变化的 参数信息。
无线局域网中可以有多个基本服务集的多个参数信息进行变化。 应理 解, 在某个时刻, 无线局域网中只允许传输一个基本服务集的参数信息。 因 此, 本发明实施例中的对某个接入点来描述是针对某个时刻而言。 实际上, 在其他时刻,另一接入点也可以向其他接入点发送的参数信息。为方便描述, 本发明实施例只针对某一时刻一个接入点发送参数信息的情况进行描述。
可选地, 参数信息可以包括接入点 110所在的基本服务集的活跃节点个 数, 其中, 该确定单元 111, 具体用于当该基本服务集的活跃节点增加的个 数或者减少的个数超过门限时,确定该基本服务集的活跃节点个数为该参数 信息。 应理解, 若该基本服务集的活跃节点个数变化时, 该参数信息可以包 括该基本服务集的当前活跃节点个数。
应理解, 该基本服务集的参数信息可以包括以下至少一个可以表示该基 本服务集的当前信道占用状态的参数。 例如: 该基本服务集的活跃节点的个 数和该基本服务集的站点的发送功率等。
其他接入点在接收到参数信息后, 可以根据该参数信息, 调整各自的 CCA门限值。
可选地, 作为另一实施例, 发送单元 112发送的参数信息可以包括基本 服务集中的活跃节点个数。
应理解, 基本服务集中可以具有活跃节点的增加门限和减少门限。 当活 跃节点个数的增加量超过该增加门限或减少量超过该减少门限时, 该活跃节 点个数会影响自身或其他接入点的 CCA门限值。 可选地, 作为另一实施例, 本发明实施例中的接入点 110可以在活跃节点个数的增加量超过该增加门限 或活跃节点个数的减少量超过该减少门限时, 触发发送单元 112发送该变化 后的活跃节点个数。
可选地, 作为另一实施例, 发送单元 112还用于向其他接入点发送接入 点 110的 CCA门限值。
应理解, 在其他时刻, 该接入点 110也可以根据其他接入点发送的参数 信息调整自身的 CCA门限值。该调整方法可以和图 2-图 10所涉及的接入点 进行调整 CCA门限值的方法相同。若该接入点 110的 CCA门限值发生变化, 则发送单元 112还可以发送该接入点 110的变化后的 CCA门限值。 若该接 入点 110的 CCA门限值没有发生变化, 则发送单元 112还可以发送当前没 发生变化的 CCA门限值。
可选地, 作为另一实施例, 发送单元 112可以向其他接入点发送 CCA 响应帧, 该 CCA响应帧可以包含该接入点 110的 CCA门限值。
可选地, 作为另一实施例, 发送单元 112发送的 CCA响应帧可以在访 问网络查询协议元素或公共行为帧中承载。
本发明实施例对该 CCA响应帧的描述适用于图 5和图 7中对 CCA响应 帧的描述, 为避免重复, 此处不再加以描述。
可选地, 作为另一实施例, 发送单元 112还可以用于向其他接入点发送
CCA请求帧, 该 CCA请求帧可以包含该参数信息。
可选地, 作为另一实施例, 发送单元 112发送的 CCA请求帧可以在访 问网络查询协议元素或公共行为帧中承载。
本发明实施例对该 CCA请求帧的描述适用于图 4和图 6中对 CCA请求 帧的描述, 为避免重复, 此处不再加以描述。
可选地, 本发明实施例中的接入点 20还可以对所在的基本服务集的站 点的 CCA门限值进行动态调整。
下面, 对基本服务集中的站点进行详细描述。
站点可以包括: 接收单元和调整单元, 其中,
接收单元用于接收接入点 20的指示信息, 该指示信息用于指示该站点 根据该指示信息调整该站点的 CCA门限值; 调整单元用于才艮据该指示信息, 调整该站点的 CCA门限值。
本发明实施例中的站点仅需要配合接入点进行 CCA门限值的调整。 本 发明实施例可以减少开销, 并提高节点的 CCA门限值调整过程的灵活性和 准确性。
基本服务集中有多个站点。 应理解, 本发明实施例中接入点可以对基本 服务集中的所有站点的 CCA门限值进行调整, 也可以对所有站点中的部分 站点的 CCA门限值进行调整。
可选地, 作为另一实施例, 该指示信息可以包括接入点 20根据该接入 点 20的调整后的 CCA门限值确定的新的 CCA门限值。 站点可以才艮据该指 示信息, 调整站点的 CCA门限值为该新的 CCA门限值。
可选地, 作为另一实施例, 该指示信息可以包括接入点 20的调整后的 CCA门限值,即接入点 20将自身调整后的 CCA门限值作为站点的新的 CCA 门限值。 这样, 站点可以根据该指示信息, 调整该站点的 CCA门限值为该 接入点 20的调整后的 CCA门限值。
另外, 在特殊情况下, 接入点 20可以调整个别站点的 CCA门限, 使得 该个别站点可以并发通信。
可选地, 作为另一实施例, 站点的接收单元接收到的指示信息可以在信 标帧、 请求发送帧或探测响应帧中承载。
具体地, 该信标帧、 请求发送帧或探测响应帧可以承载指示信息中站点 的新的 CCA门限值。 该信标帧、 请求发送帧或探测响应帧的格式可以如图 8-图 10 中分别对信标帧、 请求发送帧或探测响应帧的描述。 为避免重复, 此处不再详细描述。
可选地, 作为另一实施例, 该信标帧、 请求发送帧或探测响应帧可以包 括 CCA调整计数器字段。
作为本发明实施例的另一种实施例, 站点还可以包括定时器单元。 定时器单元可以根据该 CCA调整计数器字段, 定时调整该站点的 CCA 门限值。
应理解,如图 8-图 10中的 CCA调整计数器字段用于指示站点按照指示 的时间进行 CCA门限值调整。为保证站点同步性,本发明实施例可以在 CCA 调整计数器字段设置合适的值。 例如, 在图 8所示的信标帧中给定 CCA调 整计数器字段的值为 5, 则站点在收到当前信标帧后的第 5个信标帧后开始 调整自身的 CCA门限值。 由此, 站点的定时器单元, 可以根据该 CCA调整 计数器字段, 可以定时调整站点的 CCA门限值, 使得多个站点可以进行同 步调整。
本发明实施例中接入点根据其他接入点发送的参数信息和 CCA 门限 值, 调整自身的 CCA门限值。接入点能够对接入点的 CCA门限值进行动态 调整, 提高通信效率。
另外,本发明实施例中的接入点既可以在基本服务集之间调整接入点的 CCA门限值, 又可以在基本服务集内部调整站点的 CCA门限值。 这样, 接 入点通过分层调整网络中的所有节点的 CCA门限值的方法, 能够把复杂的 调整算法只运行在接入点,站点仅需要配合接入点进行 CCA门限值的调整。 本发明实施例可以减少开销, 并提高节点的 CCA门限值调整过程的灵活性 和准确性。
上文描述了调整 CCA门限值的接入点和站点。 下面结合具体实施例, 描述本发明实施例的方法。
图 12是本发明一个实施例的调整空闲信道评估 CCA门限值的方法的示 意性流程图。 图 12所示的方法可以由图 2至图 10所涉及的接入点 20执行。 如图 12所示, 该方法可以包括:
121 , 接入点接收另一接入点发送的参数信息, 该另一接入点发送的参 数信息表示该另一接入点所在的基本服务集的当前信道占用状态;
122, 接入点根据该另一接入点发送的参数信息, 调整该接入点的空闲 信道评估 CCA门限值。
本发明实施例中接入点根据其他接入点发送的表示信道占用状态的参 数信息, 调整自身的 CCA门限值。 能够对接入点的 CCA门限值进行动态调 整, 提高通信效率。
图 12的方法可以由图 2-图 10所涉及的接入点来实现。 为避免重复, 此 处不再详细描述。
可选地, 作为另一实施例, 另一接入点发送的参数信息可以包括另一接 入点所在的基本服务集的活跃节点个数, 该接入点根据该另一接入点发送的 参数信息, 调整该接入点的 CCA门限值, 可以包括:
当另一接入点所在的基本服务集的活跃节点个数大于接入点所在的基 本服务集的活跃节点个数时, 接入点调高该接入点的 CCA门限值; 当另一接入点所在的基本服务集的活跃节点个数小于该接入点所在的 基本服务集的活跃节点个数时, 该接入点调低该接入点的 CCA门限值。
可选地, 作为另一实施例, 接入点可以根据另一接入点发送的参数信息 和其他参数信息, 调整接入点的 CCA门限值, 该其他参数信息可以包括下 列信息中的至少一个: 该接入点所在的基本服务集的站点的位置、 接入点所 在的基本服务集的站点的发射功率和接入点所在的基本服务集的路径损耗。
图 13为本发明另一实施例的调整 CCA门限值的方法的示意性流程图。 如图 13所示, 该方法还可以包括:
123, 接入点接收该另一接入点发送的另一接入点的 CCA门限值。 接入点可以根据该另一接入点发送的参数信息和该另一接入点的 CCA 门限值, 调整该接入点的 CC A门限值。
可选地, 作为另一实施例, 该方法还可以包括:
124, 接入点确定 CCA列表, 该 CCA列表包括该接入点的邻近接入点 的标识信息、 该邻近接入点的 CCA门限值和表示该邻近接入点所在的基本 服务集的当前信道占用状态的参数信息。
可选地, 作为另一实施例, 在 124中, 接入点可以根据该 CCA列表的 变化情况, 调整该接入点的 CCA门限值。
可选地, 作为另一实施例, 该方法还包括:
125 ,接入点向该接入点的邻近接入点发送该接入点的调整后的 CCA门 限值。
可选地, 作为另一实施例, 该方法还包括:
126, 接入点向接入点所在的基本服务集中的站点发送指示信息, 该指 示信息用于指示站点才艮据该指示信息调整站点的 CCA门限值。
可选地,作为另一实施例,该指示信息可以包括接入点的调整后的 CCA 门限值。
可选地, 作为另一实施例, 在 121中, 接入点可以接收另一接入点发送 的 CCA请求帧, 该 CCA请求帧可以包含另一接入点发送的参数信息。
可选地, 作为另一实施例, 该 CCA请求帧可以在访问网络查询协议元 素或公共行为帧中承载。
可选地, 作为另一实施例, 在 125中, 接入点可以向该接入点的邻近接 入点发送 CCA响应帧, 该 CCA响应帧可以包含该接入点的调整后的 CCA 门限值。
可选地, 作为另一实施例, 该 CCA响应帧可以在访问网络查询协议元 素或公共行为帧中承载。
可选地, 作为另一实施例, 该指示信息可以在信标帧、 请求发送帧或探 测响应帧中 载。
可选地, 作为另一实施例, 信标帧、 请求发送帧或探测响应帧可以包含 CCA调整计数器字段。
图 14是本发明另一实施例的调整 CCA门限值的方法的示意性流程图。 图 14所示的方法可以由图 11所涉及的接入点 110执行。 如图 14所示, 该 方法可以包括:
141 , 接入点确定参数信息, 该参数信息表示该接入点所在的基本服务 集的当前信道占用状态;
142, 接入点向其他接入点发送该参数信息。
本发明实施例中接入点向其他接入点发送表示接入点所在的基本服务 集的信道占用状态的参数信息, 以便于其他接入点根据该参数信息, 调整各 自的 CCA门限值。
可选地, 作为另一实施例, 另一接入点发送的参数信息可以包括该基本 服务集的活跃节点个数, 其中, 该接入点确定参数信息, 包括:
当该基本服务集的活跃节点增加的个数或者减少的个数超过门限时,确 定该基本服务集的活跃节点个数为该参数信息。
可选地, 作为另一实施例, 该方法还可以包括:
143, 接入点向该其他接入点发送该接入点的空闲信道评估 CCA 门限 值。
可选地, 作为另一实施例, 在 143 中, 接入点可以向其他接入点发送 CCA响应帧, 该 CCA响应帧可以包含该接入点的 CCA门限值。
可选地, 作为另一实施例, 该 CCA响应帧可以在访问网络查询协议元 素或公共行为帧中承载。
可选地, 作为另一实施例, 在 142中,接入点可以其他接入点发送 CCA 请求帧, 该 CCA请求帧可以包含该参数信息。
可选地, 作为另一实施例, 该 CCA请求帧可以在访问网络查询协议元 素或公共行为帧中承载。 图 15是本发明一个实施例的调整 CCA门限值的方法的过程的示意性流 程图。 图 15中调整 CCA门限值的方法的过程可以包括接入点之间的交互过 程和接入点与站点之间的交互过程。
151, 当表示接入点所在的基本服务集的当前信道占用状态的参数信息 发生变化时,接入点向邻近接入点发送 CCA请求帧, 该 CCA请求帧包含该 变化后的参数信息。
应理解, 无线局域网可以包括多个基本服务集和对应的多个接入点。 本 发明实施例中仅对多个接入点中的某一个接入点进行描述,对于无线局域网 中的每一个接入点均可以向邻近接入点发送表示该接入点所在的基本服务 集的当前信道占用状态的参数信息。
当基本服务集中的参数信息发生变化时,接入点可以向邻近接入点发送 变化后的参数信息。 应理解, 该参数信息可以影响接入点和其他接入点的
CCA门限值。 由于 CCA门限值可以用来评估信道占用状态, 因而该参数信 息可以用来表示基本服务集的当前信道占用状态。
无线局域网中可以有多个基本服务集的参数信息进行变化。 应理解, 在 某个时刻, 只允许传输一个基本服务集变化后的参数信息。 因此, 本发明实 施例中的对某个接入点来描述是针对某个时刻而言。
可选地, 基本服务集的参数信息可以包括基本服务集的活跃节点个数。 应理解, 若基本服务集的活跃节点个数变化时, 该参数信息可以包括基本服 务集的活跃节点个数。
该基本服务集的参数信息可以包括以下至少一个可以表示该基本服务 集的当前信道占用状态的参数。 例如: 该接入点所在的基本服务集的活跃节 点的个数和该基本服务集的站点的发送功率等。
应理解, 基本服务集中可以具有活跃节点的增加门限和减少门限。 当活 跃节点个数的增加量超过该增加门限或活跃节点个数的减少量超过该减少 门限时, 该活跃节点个数会影响自身或邻近接入点的 CCA门限值。 可选地, 作为另一实施例, 本发明实施例中的接入点可以在活跃节点个数的增加量超 过该增加门限或减少量超过该减少门限时,触发接入点发送该变化后的活跃 节点个数。
可选地, 作为另一实施例, CCA请求帧可以在访问网络查询协议元素 或公共行为帧中承载。 该 CCA请求帧的描述适用于图 4和图 6中对 CCA请求帧的描述,为避 免重复, 此处不再加以描述。
152, 可以侦听到该 CCA请求帧的邻近接入点接收该 CCA请求帧。 应理解, 本领域普通技术人员可以得知, 该邻近接入点为其他接入点中 可以侦听其发送的信息的接入点。
153, 邻近接入点从接收到的 CCA请求帧中提取变化后的参数信息。 邻近接入点各自接收到该 CCA请求帧后, 可以各自提取其中的变化后 的参数信息。
154, 邻近接入点根据提取的变化后的参数信息, 对各自的 CCA门限值 进行调整。
若邻近接入点中的部分接入点判断该变化后的参数信息不足以影响该 部分接入点的 CCA门限值, 该部分接入点可以将调整量设为零, 即该部分 接入点的 CCA门限值可以不发生变化。
变化后的参数信息可以包括接入点所在的基本服务集的活跃节点个数。 本发明实施例中, 当提取到的变化后的参数信息中的活跃节点个数大于邻近 接入点所在的基本服务集的活跃节点个数时, 邻近接入点可以调高各自的 CCA 门限值; 当提取到的变化后的参数信息中的活跃节点个数小于邻近接 入点所在的基本服务集的活跃节点个数时, 邻近接入点可以调低接入点的 CCA门限值。 具体地, 邻近接入点调高或调低各自的 CCA门限值时, 可以 根据提取到的变化后的参数信息中的活跃节点个数与邻近接入点各自的活 跃节点个数的差值确定 CCA门限值的调整粒度。
邻近接入点根据活跃节点个数的变化对 CCA门限值进行调整时还可以 参考其他参数信息。 该其他参数信息可以包括下列信息中的至少一个: 邻近 接入点所在的基本服务集中的站点的位置、邻近接入点所在的基本服务集中 的站点的发射功率和邻近接入点所在的基本服务集的路径损耗。
例如, 当邻近接入点所在的基本服务集内接入点和站点的距离越长, CCA门限值越低, 即调低 CCA门限值的调整量越大; 当邻近接入点所在的 基本服务集内接入点和站点的距离越短, CCA门限值越高, 即调高 CCA门 限值的调整量越大。
当邻近接入点所在的基本服务集内接入点和站点的发射功率越小, CCA 门限值越低, 即调低 CCA门限值的调整量越大; 当邻近接入点所在的基本 月良务集内接入点和站点的发射功率越大, CCA门限值越高, 即调高 CCA门 限值的调整量越大。
当邻近接入点所在的基本服务集的路径损耗越小, CCA 门限值越高, 即调高 CCA门限值的调整量越大; 当邻近接入点所在的基本服务集内接入 点和站点的路径损耗越大, CCA门限值越低即调低 CCA门限值的调整量越 大。
具体地,通过对比提取到的变化后的参数信息中的活跃节点个数与邻近 接入点各自的活跃节点个数,邻近接入点可以确定调高或者调低邻近接入点 的新的 CCA门限值。 应理解, 对于具体将 CCA门限值调整到的何值, 不同 的算法和调整方法会得出不同的门限值。本发明实施例对邻近接入点调整自 身的 CCA门限值到某一门限值的具体方法并不做限定。
可选地, 网络中每个接入点都可以保存 CCA列表。 该 CCA列表包括邻 近接入点的标识信息、 邻近接入点的 CCA门限值和表示邻近接入点所在的 基本服务集的当前信道占用状态的参数信息。
因此, 邻近接入点可以将接收到的变化后的参数信息存储在 CCA列表 中。 从上述描述可知, 当有多个接入点的参数信息和 CCA门限值发生变化, 可以在不同时刻分别向邻近接入点发送该变化后的参数信息和变化后的 CCA门限值。 因此, 该 CCA列表中可以包括邻近接入点发生变化后的参数 信息和变化后的 CCA门限值。 也就是说, 邻近接入点的参数信息和 CCA门 限值发生变化, 均可以类比该接入点向邻近接入点发送变化后的参数信息和 CCA门限值。
可见,邻近接入点多次接收到的多个接入点的多个变化后的参数信息和 多个 CCA门限值也记录在 CCA列表中。
具体地, CCA 列表中的多个接入点的标识信息可以用于标识不同的接 入点。 CCA列表中的多个接入点的 CCA门限值和多个接入点的变化后的参 数信息可以包括从多个接入点接收的信息。
可选地, 作为另一实施例, 邻近接入点还可以根据各自的 CCA列表, 调整邻近接入点中每个接入点的 CCA门限值。
可选地, 作为一个实施例。 邻近接入点可以基于 CCA列表中发生变化 的参数信息, 调整邻近接入点各自的 CCA门限值。 具体地, 邻近接入点可 以根据活跃节点个数来调整 CCA门限值, 并参考邻近接入点各自所在的基 本服务集的站点的位置、功率和路径损耗等信息来调整该邻近接入点各自的
CCA门限值。
例如, 当邻近接入点所在的基本服务集内接入点和站点的距离越长, CCA门限值越低, 即调低 CCA门限值的调整量越大; 当邻近接入点所在的 基本服务集内接入点和站点的距离越短, CCA门限值越高, 即调高 CCA门 限值的调整量越大。
当邻近接入点所在的基本服务集内接入点和站点的发射功率越小, CCA 门限值越低, 即调低 CCA门限值的调整量越大; 当邻近接入点所在的基本 月良务集内接入点和站点的发射功率越大, CCA门限值越高, 即调高 CCA门 限值的调整量越大。
当邻近接入点所在的基本服务集的路径损耗越小, CCA 门限值越高, 即调高 CCA门限值的调整量越大; 当邻近接入点所在的基本服务集内接入 点和站点的路径损耗越大, CCA门限值越低即调低 CCA门限值的调整量越 大。
可选地, 作为另一实施例, 本发明实施例中邻近接入点也可以将 CCA 列表中发生变化的 CCA门限值作为判定的标准。 例如, 若 CCA列表中发生 变化的 CCA门限值大于邻近接入点自身的 CCA门限值,邻近接入点则调高 各自的 CCA门限值; 若 CCA列表中发生变化的 CCA门限值小于邻近接入 点自身的 CCA门限值, 邻近接入点则调低各自的 CCA门限值。
可选地, 作为另一实施例, 邻近接入点也可以同时基于发生变化的参数 信息和发生变化的 CCA门限值, 调整各自的 CCA门限值。 例如, 邻近接入 点可以基于 CCA列表中发生变化的参数信息为基准, 定性地调高或者调低 CCA门限值, 再参考 CCA列表中变化后的 CCA门限值, 定量来确定具体 调高或者调低到的某一 CCA门限值。
可选地, 作为另一实施例, 本发明实施例中邻近接入点还可以将发生变 化的参数信息和发生变化的 CCA门限值同时作为输入值, 基于某种算法计 算得出各自新的 CCA门限值。
可选地, 作为另一实施例, 本发明实施例中邻近接入点还可以将各自具 有的 CCA列表中所有接入点的参数信息和所有接入点的 CCA门限值都作为 输入值, 基于某种算法计算得出邻近接入点的新的 CCA门限值。 可选地, 本发明实施例对调整算法的具体算法并不限于此。 155, 邻近接入点向网络中的其他接入点发送 CCA响应帧, 该 CCA响 应帧包含该邻近接入点调整后的 CCA门限值。
本发明实施例对该 CCA响应帧的描述适用于图 5和图 7中对 CCA响应 帧的描述, 为避免重复, 此处不再加以描述。
156, 邻近接入点向所在的基本服务集中的站点发送指示信息, 以便于 基本服务集的站点根据该指示信息调整该站点的 CCA门限值。
应理解, 邻近接入点中的每个接入点都可以在调整自身的 CCA门限值 之后, 分别调整各自所在的基本服务集中的站点的 CCA门限值。
基本服务集中有多个站点。 应理解, 本发明实施例中对每个接入点各自 所在的基本服务集中的站点进行调整, 可以对基本服务集中的所有站点的 CCA门限值进行调整, 也可以对所有站点中的部分站点的 CCA门限值进行 调整。
可选地, 作为另一实施例, 本发明实施例中邻近接入点可以根据各自调 整后的 CCA门限值, 确定所有站点或部分站点的新的 CCA门限值, 并调整 该所有站点或部分站点的 CCA门限值为新的 CCA门限值。
可选地, 作为另一实施例, 在某些特殊情况, 邻近接入点还可以调整个 别站点的 CCA门限, 使得该个别站点可以并发通信。 本发明实施例对邻近 接入点如何各自调整站点的 CCA门限值的方法并不做限定。
具体地, 指示信息可以由数据帧表示。 指示信息可以包括站点需要调整 的新的 CCA门限值。站点才艮据该指示信息可以调整自身的 CCA门限值为该 新的 CCA门限值。
可选地, 作为另一实施例, 邻近接入点的每一个接入点可以将自身调整 后的 CCA门限值作为站点的新的 CCA门限值。 其中, 该指示信息可以包括 该调整后的 CCA门限值。这样,站点可以才艮据该指示信息,调整自身的 CCA 门限值为该站点所属的接入点的调整后的 CCA门限值。
指示信息可以在信标帧、 请求发送帧或探测响应帧中承载。 该指示信息 的承载方式与图 8-图 10中对指示信息承载在不同的数据帧中的描述可以相 同, 为避免重复, 此处不再加以描述。
本发明实施例中接入点根据其他接入点发送的参数信息和 CCA 门限 值, 调整自身的 CCA门限值。 能够接入点的 CCA门限值进行动态调整, 提 高通信效率。 另外,本发明实施例中接入点既可以在基本服务集之间调整接入点 CCA 门限值, 又可以在基本服务集内部调整站点 CCA门限值。 这样, 接入点通 过分层调整网络中的所有节点的 CCA门限值的方法, 能够把复杂的调整算 法只运行在接入点, 站点仅需要配合接入点进行 CCA门限值的调整。 本发 明实施例可以减少开销, 并提高节点的 CCA门限值调整过程的灵活性和准 确性。
图 16是本发明另一实施例的接入点的框图。 图 16的接入点 160可用于 实现上述方法实施例中个步骤及方法。 图 16的接入点 160包括处理器 161、 存储器 162、 接收电路 163和发射电路 164。 处理器 161、 存储器 162、 接收 电路 163和发射电路 164通过总线系统 169连接。
此外, 接入点 160还可以包括天线 165等。 处理器 161控制接入点 160 的操作。存储器 162可以包括只读存储器和随机存取存储器,并向处理器 161 提供指令和数据。存储器 162的一部分还可以包括非易失行随机存取存储器 (简称 NVRAM )。 具体的应用中, 发射电路 164和接收电路 163可以耦合 到天线 165。 接入点 160的各个组件通过总线系统 169耦合在一起, 其中总 线系统 169除包括数据总线之外, 还包括电源总线、 控制总线和状态信号总 线。 但是为了清楚说明起见, 在图中将各种总线都标为总线系统 169。
处理器 161可能是一种集成电路芯片, 具有信号的处理能力。 上述的处 理器 161可以是通用处理器、 数字信号处理器(简称 DSP )、 专用集成电路 (简称 ASIC )、现成可编程门阵列(简称 FPGA )或者其他可编程逻辑器件、 分立门或者晶体管逻辑器件、 分立硬件组件。 可以实现或者执行本发明实施 例中的公开的各方法、 步骤及逻辑框图。 通用处理器可以是微处理器或者该 处理器也可以是任何常规的处理器等。处理器 161读取存储器 162中的信息, 结合其硬件控制接入点 160的各个部件。
图 12的方法可以在图 16的接入点 160中实现, 为避免重复, 不再详细 描述。
具体地, 在处理器 161的控制之下, 接入点 160完成以下操作: 接收另一接入点发送的参数信息, 该另一接入点发送的参数信息表示该 另一接入点所在的基本服务集的当前信道占用状态;
根据该另一接入点发送的参数信息, 调整该接入点的 CC A门限值。 本发明实施例中接入点根据其他接入点发送的表示信道占用状态的参 数信息, 调整自身的 CCA门限值。 能够对接入点的 CCA门限值进行动态调 整, 提高通信效率。
可选地, 作为一个实施例。 另一接入点发送的参数信息可以包括另一接 入点所在的基本服务集的活跃节点个数, 该处理器 161可以
当另一接入点所在的基本服务集的活跃节点个数大于接入点所在的基 本服务集的活跃节点个数时, 调高接入点的 CCA门限值;
当另一接入点所在的基本服务集的活跃节点个数小于接入点所在的基 本服务集的活跃节点个数时, 调低接入点的 CCA门限值。
可选地, 作为另一实施例, 处理器 161可以根据另一接入点发送的参数 信息和其他参数信息, 调整接入点 160的 CCA门限值, 该其他参数信息可 以包括下列信息中的至少一个: 接入点所在的基本服务集中的站点的位置、 该接入点所在的基本服务集的站点的发射功率和该接入点所在的基本服务 集的路径损耗。
可选地, 作为另一实施例, 接收电路 163还可以接收另一接入点发送的 该另一接入点的 CCA门限值; 其中处理器 161可以根据该另一接入点发送 的参数信息和该另一接入点的 CCA门限值, 调整该接入点的 CCA门限值。
可选地,作为另一实施例,存储器 162可以用于存储 CCA列表,该 CCA 列表包括该接入点的邻近接入点的标识信息、 邻近接入点的 CCA门限值和 表示邻近接入点所在的基本服务集的信道占用状态的参数信息。
可选地, 作为另一实施例, 处理器 161可以根据 CCA列表的变化情况, 调整接入点的 CCA门限值。
可选地, 作为另一实施例, 发射电路 164可以向接入点 160的邻近接入 点发送该接入点的调整后的 CCA门限值。
可选地, 作为另一实施例, 发射电路 164可以向接入点所在的基本服务 集中的站点发送指示信息, 该指示信息用于指示该站点根据该指示信息调整 该站点的 CCA门限值。
可选地, 作为另一实施例, 发射电路 164发送的该指示信息可以包括该 接入点的调整后的 CCA门限值。
可选地, 作为另一实施例, 接收电路 163可以接收该另一接入点发送的 CCA请求帧, 该 CCA请求帧可以包含该另一接入点发送的参数信息。
可选地, 作为另一实施例, 接收电路 163接收的该 CCA请求帧可以在 访问网络查询协议元素或公共行为帧中承载。
可选地, 作为另一实施例, 发射电路 164可以向接入点 160的邻近接入 点发送 CCA响应帧, 该 CCA响应帧可以包含该接入点的调整后的 CCA门 限值。
可选地, 作为另一实施例, 发射电路 164发送的 CCA响应帧可以在访 问网络查询协议元素或公共行为帧中承载。
可选地,作为另一实施例,发射电路 164发送的指示信息可以在信标帧、 请求发送帧或探测响应帧中承载。
可选地, 作为另一实施例, 信标帧、 请求发送帧或探测响应帧可以包含 CCA调整计数器字段。
本发明实施例中接入点根据其他接入点发送的参数信息和 CCA 门限 值, 调整自身的 CCA门限值。 能够接入点的 CCA门限值进行动态调整, 提 高通信效率。
另外, 本发明实施例中接入点既可以在基本服务集之间调整接入点的 CCA门限值, 又可以在基本服务集内部调整站点的 CCA门限值。 这样, 接 入点通过分层调整网络中的所有节点的 CCA门限值的方法能够把复杂的调 整算法只运行在接入点, 站点仅需要配合接入点进行 CCA门限值的调整。 本发明实施例可以减少开销, 并提高节点的 CCA门限值调整过程的灵活性 和准确性。
图 17是本发明另一实施例的接入点的框图。 图 17的接入点 170可用于 实现上述方法实施例中个步骤及方法。 图 17的接入点 170包括处理器 171、 存储器 172、 接收电路 173和发射电路 174。 处理器 171、 存储器 172、 接收 电路 173和发射电路 174通过总线系统 179连接。
此外, 接入点 170还可以包括天线 175等。 处理器 171控制接入点 170 的操作。存储器 172可以包括只读存储器和随机存取存储器,并向处理器 171 提供指令和数据。存储器 172的一部分还可以包括非易失行随机存取存储器 (简称 NVRAM )。 具体的应用中, 发射电路 174和接收电路 173可以耦合 到天线 175。 接入点 170的各个组件通过总线系统 179耦合在一起, 其中总 线系统 179除包括数据总线之外, 还包括电源总线、 控制总线和状态信号总 线。 但是为了清楚说明起见, 在图中将各种总线都标为总线系统 179。
处理器 171可能是一种集成电路芯片, 具有信号的处理能力。 上述的处 理器 171可以是通用处理器、 数字信号处理器(简称 DSP )、 专用集成电路 (简称 ASIC )、现成可编程门阵列(简称 FPGA )或者其他可编程逻辑器件、 分立门或者晶体管逻辑器件、 分立硬件组件。 可以实现或者执行本发明实施 例中的公开的各方法、 步骤及逻辑框图。 通用处理器可以是微处理器或者该 处理器也可以是任何常规的处理器等。处理器 171读取存储器 172中的信息, 结合其硬件控制接入点 170的各个部件。
图 14的方法可以在图 17的接入点 170中实现, 为避免重复, 不再详细 描述。
具体地, 在处理器 171的控制之下, 接入点 170完成以下操作: 确定参数信息, 该参数信息表示该接入点所在的基本服务集的当前信道 占用状态;
向其他接入点发送该参数信息。
可选地, 作为一个实施例。 接收电路 173接收的参数信息可以包括该基 本服务集中的活跃节点个数, 其中, 处理器 171, 具体用于当该基本服务集 的活跃节点增加的个数或者减少的个数超过门限时,确定该基本服务集的活 跃节点个数为该参数信息。
可选地, 作为另一实施例, 发射电路 174还可以向其他接入点发送该接 入点的空闲信道评估 CCA门限值。
可选地, 作为另一实施例, 发射电路 174可以向其他接入点发送 CCA 响应帧, 该 CCA响应帧可以包含该接入点的 CCA门限值。
可选地, 作为另一实施例, 发射电路 174发送的该 CCA响应帧在访问 网络查询协议元素或公共行为帧中承载。
可选地, 作为另一实施例, 发射电路 174可以向其他接入点发送 CCA 请求帧, 该 CCA请求帧可以包含该参数信息。
可选地, 作为另一实施例, 发射电路 174发送的该 CCA请求帧可以在 访问网络查询协议元素或公共行为帧中承载。
本发明实施例中表示接入点所在的基本服务集的信道占用状态的参数 信息变化时, 接入点向其他接入点发送变化后的参数信息, 以便于其他接入 点根据该变化后的参数信息, 调整各自的 CCA门限值。
应理解, 说明书通篇中提到的 "一个实施例" 或 "一实施例" 意味着与 实施例有关的特定特征、 结构或特性包括在本发明的至少一个实施例中。 因 此, 在整个说明书各处出现的 "在一个实施例中" 或 "在一实施例中" 未必 一定指相同的实施例。 此外, 这些特定的特征、 结构或特性可以任意适合的 方式结合在一个或多个实施例中。 应理解, 在本发明的各种实施例中, 上述 各过程的序号的大小并不意味着执行顺序的先后,各过程的执行顺序应以其 功能和内在逻辑确定, 而不应对本发明实施例的实施过程构成任何限定。
另外, 本文中术语 "系统" 和 "网络" 在本文中常被可互换使用。 本文 中术语 "和 /或", 仅仅是一种描述关联对象的关联关系, 表示可以存在三种 关系, 例如, A和 /或 可以表示: 单独存在 , 同时存在 和^ 单独存 在 B这三种情况。另外,本文中字符 "/",一般表示前后关联对象是一种 "或" 的关系。
应理解, 在本发明实施例中, "与 A相应的 B"表示 B与 A相关联, 根 据 A可以确定 B。 但还应理解, 根据 A确定 B并不意味着仅仅根据 A确定 B , 还可以根据 A和 /或其它信息确定^
本领域普通技术人员可以意识到, 结合本文中所公开的实施例描述的各 示例的单元及算法步骤, 能够以电子硬件、 计算机软件或者二者的结合来实 现, 为了清楚地说明硬件和软件的可互换性, 在上述说明中已经按照功能一 般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执 行, 取决于技术方案的特定应用和设计约束条件。 专业技术人员可以对每个 特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超 出本发明的范围。
所属领域的技术人员可以清楚地了解到, 为了描述的方便和简洁, 上述 描述的系统、 装置和单元的具体工作过程, 可以参考前述方法实施例中的对 应过程, 在此不再赘述。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统、 装置和 方法, 可以通过其它的方式实现。 例如, 以上所描述的装置实施例仅仅是示 意性的, 例如, 所述单元的划分, 仅仅为一种逻辑功能划分, 实际实现时可 以有另外的划分方式, 例如多个单元或组件可以结合或者可以集成到另一个 系统, 或一些特征可以忽略, 或不执行。 另外, 所显示或讨论的相互之间的 耦合或直接輛合或通信连接可以是通过一些接口、装置或单元的间接輛合或 通信连接, 也可以是电的, 机械的或其它的形式连接。 为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或 者全部单元来实现本发明实施例方案的目的。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处理单元 中, 也可以是各个单元单独物理存在, 也可以是两个或两个以上单元集成在 一个单元中。 上述集成的单元既可以釆用硬件的形式实现, 也可以釆用软件 功能单元的形式实现。
通过以上的实施方式的描述, 所属领域的技术人员可以清楚地了解到本 发明可以用硬件实现, 或固件实现, 或它们的组合方式来实现。 当使用软件 实现时, 可以将上述功能存储在计算机可读介质中或作为计算机可读介质上 的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和 通信介质,其中通信介质包括便于从一个地方向另一个地方传送计算机程序 的任何介质。 存储介质可以是计算机能够存取的任何可用介质。 以此为例但 不限于: 计算机可读介质可以包括 RAM、 ROM, EEPROM、 CD-ROM或其 他光盘存储、 磁盘存储介质或者其他磁存储设备、 或者能够用于携带或存储 具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其 他介质。 此外。 任何连接可以适当的成为计算机可读介质。 例如, 如果软件 是使用同轴电缆、 光纤光缆、 双绞线、 数字用户线(简称 DSL )或者诸如红 外线、无线电和微波之类的无线技术从网站、服务器或者其他远程源传输的, 那么同轴电缆、 光纤光缆、 双绞线、 DSL或者诸如红外线、 无线和微波之类 的无线技术包括在所属介质的定影中。 如本发明所使用的, 盘(Disk )和碟 ( disc ) 包括压缩光碟(CD )、 激光碟、 光碟、 数字通用光碟(DVD )、 软盘 和蓝光光碟,其中盘通常磁性的复制数据,而碟则用激光来光学的复制数据。 上面的组合也应当包括在计算机可读介质的保护范围之内。
总之, 以上所述仅为本发明技术方案的较佳实施例而已, 并非用于限定 本发明的保护范围。 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, 均应包含在本发明的保护范围之内。

Claims

权利要求
1、 一种接入点, 其特征在于, 包括:
接收单元, 用于接收另一接入点发送的参数信息, 所述另一接入点发送 的参数信息表示所述另一接入点所在的基本服务集的当前信道占用状态; 调整单元, 用于根据所述另一接入点发送的参数信息, 调整所述接入点 的空闲信道评估 CCA门限值。
2、 根据权利要求 1 所述的接入点, 其特征在于, 所述另一接入点发送 的参数信息包括所述另一接入点所在的基本服务集的活跃节点个数, 所述调 整单元, 具体用于
当所述另一接入点所在的基本服务集的活跃节点个数大于所述接入点 所在的基本服务集的活跃节点个数时, 调高所述接入点的 CCA门限值; 当所述另一接入点所在的基本服务集的活跃节点个数小于所述接入点 所在的基本服务集的活跃节点个数时, 调低所述接入点的 CCA门限值。
3、 根据权利要求 2所述的接入点, 其特征在于, 所述调整单元, 具体 用于根据所述另一接入点发送的参数信息和其他参数信息,调整所述接入点 的 CCA门限值, 所述其他参数信息包括下列信息中的至少一个: 所述接入 点所在的基本服务集的站点的位置、所述接入点所在的基本服务集的站点的 发射功率和所述接入点所在的基本服务集的路径损耗。
4、 根据权利要求 1-3 中任一项所述的接入点, 其特征在于, 所述接收 单元, 还用于接收所述另一接入点发送的所述另一接入点的 CCA门限值; 其中,
所述调整单元, 具体用于根据所述另一接入点发送的参数信息和所述另 一接入点的 CCA门限值, 调整所述接入点的 CCA门限值。
5、 根据权利要求 1-4中任一项所述的接入点, 其特征在于, 还包括: 存储单元, 用于存储 CCA列表, 所述 CCA列表包括所述接入点的邻近 接入点的标识信息、 所述邻近接入点的 CCA门限值和表示所述邻近接入点 所在的基本服务集的当前信道占用状态的参数信息。
6、 根据权利要求 5所述的接入点, 其特征在于, 所述调整单元, 具体 用于根据所述 CCA列表的变化情况, 调整所述接入点的 CCA门限值。
7、 根据权利要求 4-6中任一项所述的接入点, 其特征在于, 还包括: 发送单元, 用于向所述接入点的邻近接入点发送所述接入点的调整后的 CCA门限值。
8、 根据权利要求 1-6中任一项所述的接入点, 其特征在于, 还包括: 发送单元, 用于向所述接入点所在的基本服务集的站点发送指示信息, 所述指示信息用于指示所述站点才艮据所述指示信息调整所述站点的 CCA 门 限值。
9、 根据权利要求 8所述的接入点, 其特征在于, 所述发送单元发送的 所述指示信息包括所述接入点的调整后的 CCA门限值。
10、 根据权利要求 1-9中任一项所述的接入点, 其特征在于, 所述接收 单元, 具体用于接收所述另一接入点发送的 CCA请求帧, 所述 CCA请求帧 包含所述另一接入点发送的参数信息。
11、 根据权利要求 10所述的接入点, 其特征在于, 所述接收单元接收 的所述 CCA请求帧在访问网络查询协议元素或公共行为帧中承载。
12、 根据权利要求 7所述的接入点, 其特征在于, 所述发送单元, 具体 用于向所述邻近接入点发送 CCA响应帧,所述 CCA响应帧包含所述接入点 的调整后的 CCA门限值。
13、 根据权利要求 12所述的接入点, 其特征在于, 所述发送单元发送 的所述 CCA响应帧在访问网络查询协议元素或公共行为帧中承载。
14、 根据权利要求 8或 9所述的接入点, 其特征在于, 所述发送单元发 送的所述指示信息在信标帧、 请求发送帧或探测响应帧中承载。
15、 根据权利要求 14所述的接入点, 其特征在于, 所述信标帧、 所述 请求发送帧或所述探测响应帧包含 CCA调整计数器字段。
16、 一种接入点, 其特征在于, 包括:
确定单元, 用于确定参数信息, 所述参数信息表示所述接入点所在的基 本^)良务集的当前信道占用状态;
发送单元, 用于向其他接入点发送所述参数信息。
17、 根据权利要求 16所述的接入点, 其特征在于, 所述参数信息包括 所述基本服务集的活跃节点个数, 其中, 所述确定单元, 具体用于
当所述基本服务集的活跃节点增加的个数或者减少的个数超过门限时, 确定所述基本服务集的活跃节点个数为所述参数信息。
18、根据权利要求 16或 17所述的接入点,其特征在于,所述发送单元, 还用于向所述其他接入点发送所述接入点的空闲信道评估 CCA门限值。
19、 根据权利要求 18所述的接入点, 其特征在于, 所述发送单元, 具 体用于向所述其他接入点发送 CCA响应帧,所述 CCA响应帧包含所述接入 点的 CCA门限值。
20、 根据权利要求 19所述的接入点, 其特征在于, 所述发送单元发送 的所述 CCA响应帧在访问网络查询协议元素或公共行为帧中承载。
21、 根据权利要求 16-20中任一项所述的接入点, 其特征在于, 所述发 送单元, 具体用于向所述其他接入点发送 CCA请求帧, 所述 CCA请求帧包 含所述参数信息。
22、 根据权利要求 21 所述的接入点, 其特征在于, 所述发送单元发送 的所述 CCA请求帧在访问网络查询协议元素或公共行为帧中承载。
23、 一种调整空闲信道评估门限值的方法, 其特征在于, 包括: 接入点接收另一接入点发送的参数信息, 所述另一接入点发送的参数信 息表示所述另一接入点所在的基本服务集的当前信道占用状态;
所述接入点根据所述另一接入点发送的参数信息,调整所述接入点的空 闲信道评估 CCA门限值。
24、 根据权利要求 23所述的方法, 其特征在于, 所述另一接入点发送 的参数信息包括所述另一接入点所在的基本服务集的活跃节点个数, 所述接 入点根据所述另一接入点发送的参数信息,调整所述接入点的 CCA门限值, 包括:
当所述另一接入点所在的基本服务集的活跃节点个数大于所述接入点 所在的基本服务集的活跃节点个数时, 所述接入点调高所述接入点的 CCA 门限值;
当所述另一接入点所在的基本服务集的活跃节点个数小于所述接入点 所在的基本服务集的活跃节点个数时, 所述接入点调低所述接入点的 CCA 门限值。
25、 根据权利要求 24所述的方法, 其特征在于, 所述接入点根据所述 另一接入点发送的参数信息,调整所述接入点的空闲信道评估 CCA门限值, 包括:
所述接入点根据所述另一接入点发送的参数信息和其他参数信息,调整 所述接入点的 CCA门限值,所述其他参数信息包括下列信息中的至少一个: 所述接入点所在的基本服务集的站点的位置、所述接入点所在的基本服务集 的站点的发射功率和所述接入点所在的基本服务集的路径损耗。
26、 根据权利要求 23-25中任一项所述的方法, 其特征在于, 还包括: 所述接入点接收所述另一接入点发送的所述另一接入点的 CCA 门限 值, 其中, 所述接入点根据所述另一接入点发送的参数信息, 调整所述接入 点的空闲信道评估 CCA门限值, 包括:
所述接入点根据所述另一接入点发送的参数信息和所述另一接入点的 CCA门限值, 调整所述接入点的 CCA门限值。
27、 根据权利要求 23-26中任一项所述的方法, 其特征在于, 还包括: 所述接入点确定 CCA列表,所述 CCA列表包括所述接入点的邻近接入 点的标识信息、 所述邻近接入点的 CCA门限值和表示所述邻近接入点所在 的基本服务集的当前信道占用状态的参数信息。
28、 根据权利要求 27所述的方法, 其特征在于, 所述接入点根据所述 另一接入点发送的参数信息, 调整所述接入点的 CCA门限值, 包括:
所述接入点根据所述 CCA列表的变化情况,调整所述接入点的 CCA门 限值。
29、 根据权利要求 26-28中任一项所述的方法, 其特征在于, 还包括: 所述接入点向所述接入点的邻近接入点发送所述接入点的调整后的
CCA门限值。
30、 根据权利要求 23-28中任一项所述的方法, 其特征在于, 还包括: 所述接入点向所述接入点所在的基本服务集的站点发送指示信息, 所述 指示信息用于指示所述站点根据所述指示信息调整所述站点的 CCA 门限 值。
31、 根据权利要求 30所述的方法, 其特征在于, 所述指示信息包括所 述接入点的调整后的 CCA门限值。
32、 根据权利要求 23-31中任一项所述的方法, 其特征在于, 所述接入 点接收另一接入点发送的参数信息, 包括:
所述接入点接收所述另一接入点发送的 CCA请求帧,所述 CCA请求帧 包含所述另一接入点发送的参数信息。
33、 根据权利要求 32所述的方法, 其特征在于, 所述 CCA请求帧在访 问网络查询协议元素或公共行为帧中承载。
34、 根据权利要求 29所述的方法, 其特征在于, 所述接入点向所述接 入点的邻近接入点发送所述接入点的调整后的 CCA门限值, 包括: 所述接入点向所述邻近接入点发送 CCA响应帧,所述 CCA响应帧包含 所述接入点的调整后的 CCA门限值。
35、 根据权利要求 34所述的方法, 其特征在于, 所述 CCA响应帧在访 问网络查询协议元素或公共行为帧中承载。
36、 根据权利要求 30或 31所述的方法, 其特征在于, 所述指示信息在 信标帧、 请求发送帧或探测响应帧中承载。
37、 根据权利要求 36所述的方法, 其特征在于, 所述信标帧、 所述请 求发送帧或所述探测响应帧包含 CCA调整计数器字段。
38、 一种调整空闲信道评估门限值的方法, 其特征在于, 包括: 接入点确定参数信息, 所述参数信息表示所述接入点所在的基本服务集 的当前信道占用状态;
所述接入点向其他接入点发送所述参数信息。
39、 根据权利要求 38所述的方法, 其特征在于, 所述参数信息包括所 述基本服务集的活跃节点个数, 其中, 所述接入点确定参数信息, 包括: 当所述基本服务集的活跃节点增加的个数或者减少的个数超过门限时, 确定所述基本服务集的活跃节点个数为所述参数信息。
40、 根据权利要求 38或 39所述的方法, 其特征在于, 还包括: 所述接入点向所述其他接入点发送所述接入点的空闲信道评估 CCA门 限值。
41、 根据权利要求 40所述的方法, 其特征在于, 所述接入点向所述其 他接入点发送所述接入点的空闲信道评估 CCA门限值, 包括:
所述接入点向所述其他接入点发送 CCA响应帧,所述 CCA响应帧包含 所述接入点的 CCA门限值。
42、 根据权利要求 41所述的方法, 其特征在于, 所述 CCA响应帧在访 问网络查询协议元素或公共行为帧中承载。
43、 根据权利要求 38-42中任一项所述的方法, 其特征在于, 所述接入 点向其他接入点发送所述参数信息, 包括:
所述接入点向所述其他接入点发送 CCA请求帧,所述 CCA请求帧包含 所述参数信息。
44、 根据权利要求 43所述的方法, 其特征在于, 所述 CCA请求帧在访 问网络查询协议元素或公共行为帧中承载 t
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