WO2015070443A1 - 功率调整方法及装置 - Google Patents

功率调整方法及装置 Download PDF

Info

Publication number
WO2015070443A1
WO2015070443A1 PCT/CN2013/087255 CN2013087255W WO2015070443A1 WO 2015070443 A1 WO2015070443 A1 WO 2015070443A1 CN 2013087255 W CN2013087255 W CN 2013087255W WO 2015070443 A1 WO2015070443 A1 WO 2015070443A1
Authority
WO
WIPO (PCT)
Prior art keywords
access point
node device
basic service
service set
beacon frame
Prior art date
Application number
PCT/CN2013/087255
Other languages
English (en)
French (fr)
Inventor
郑晓昆
杨浔
蒋挺
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/087255 priority Critical patent/WO2015070443A1/zh
Priority to CN201380075801.8A priority patent/CN105144796B/zh
Priority to EP13897554.5A priority patent/EP3070980B1/en
Publication of WO2015070443A1 publication Critical patent/WO2015070443A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a power adjustment method and apparatus. Background technique
  • Each BSS includes an access point (AP) and a plurality of communication node devices.
  • the communication node device can only request access to the AP when the carrier is idle, and only one communication node device can access the AP at the same time. data transmission.
  • DCF Distributed Coordination Function
  • the coverage area of the BSS has an overlap area. It is assumed that the BSS to which the communication node device in the overlapping area belongs is the local area, and another BSS that overlaps is formed as the neighboring area. Since the communication node device in the overlapping region is within the coverage of the neighboring cell transmission, the probability that the communication node device in the overlapping region detects the carrier idle is lower than the probability that other communication node devices in the region detect the carrier idle. The probability that the communication node device in the overlapping area accesses the AP in the area and the probability of performing data transmission is also lower than the probability that other communication node devices in the area access the AP in the area and perform data transmission. probability.
  • the AP in the neighboring area can reduce the data transmission power of the communication node device in the neighboring area, and reduce the communication node device in the adjacent area to the overlapping area. Covering, without affecting the data transmission of the communication node devices in the overlapping area, to increase the probability that the communication node device in the overlapping area accesses the AP in the area.
  • the data transmission power of the communication node device in the neighboring cell cannot be accurately reduced. If the data transmission power of the communication node device in the neighboring area is reduced too much, the probability that the communication node device in the overlapping area accesses the AP in the area cannot be effectively increased; if the communication section in the neighboring area Summary of the invention
  • the technical problem to be solved by the present invention is how to accurately adjust the data transmission power of the neighboring communication node device.
  • the present invention provides a power adjustment apparatus, including:
  • a listening module configured to listen to the first beacon frame during the listening period
  • a processing module configured to be connected to the listening module, configured to: according to the received signal in the first beacon frame, if the listening module detects the first beacon frame during the listening period Intensity indication
  • An RSSI and a data field determining whether the first node device is in an overlapping area between the first basic service set and the second basic service set, the first node device accessing the first in the first basic service set Node device of the access point;
  • a determining module configured to be connected to the processing module, configured to determine, according to the RSSI, a second node device and the power adjusting device, if the processing module determines that the first node device is in the overlapping area
  • the upper limit of the data transmission power the second node device is a node device that accesses the power adjustment device in the second basic service set.
  • the first beacon frame is a frame that sends/allows to send an RTS/CTS protocol format by using a request, where the processing module is specifically configured to:
  • the determining module is connected to the listening module, and is configured to determine a time at which the next listening period starts according to a network allocation vector NAV of a duration field in the first beacon frame.
  • the processing module is further configured to: if the listening module does not hear the first listening period a beacon frame, after a set time, starting long listening on the first beacon frame, and broadcasting the long snoop start to each node device in the second basic service set to indicate Each node device in the second basic service set suspends requesting access to the power adjustment device of the second basic service set during the long listening time range.
  • the processing module is further configured to: When the listening module detects that the saturation access degree of the first access point is less than the first threshold, stopping listening to the first beacon frame, indicating that the first access point is reduced a backoff time of a node device in the first basic service set of the overlap region, the saturation access degree being determined by a time ratio of the first access point for processing a service in a first set time .
  • the processing module is further configured to: If the second basic service set exists, the third node device in the overlapping area needs to increase the probability of accessing the power adjustment device of the second basic service set, and the broadcast range of the second beacon frame is expanded to facilitate The first access point listens to the second beacon frame sent by the power adjustment apparatus of the second basic service set, so that the first access point sends according to the power adjustment apparatus of the second basic service set.
  • the second beacon frame enters its own listening period and listens to the second beacon frame sent by the third node device to determine data transmission between the first node device and the first access point.
  • Upper limit of power
  • the second beacon frame is a frame in the RTS/CTS protocol format.
  • the present invention provides a power adjustment method, including: If the second access point of the second basic service set listens to the first beacon frame during the listening period, the second access point indicates RSSI and based on the received signal strength in the first beacon frame. a data field, determining whether the first node device is in an overlapping area between the first basic service set and the second basic service set, where the first node device accesses the first access in the first basic service set Point node device;
  • the second node device is a node device that accesses the second access point in the second basic service set.
  • the first beacon frame is a frame that uses a request to send/allow to send an RTS/CTS protocol format
  • the second access point is configured according to the first
  • the received signal strength in the frame indicates the RSSI and the data field, and determines whether the first node device is in an overlapping area between the first basic service set and the second basic service set, and includes:
  • the second access point determines, according to the RSSI, whether the first node device is in the overlapping area.
  • the second access point of the second basic service set is detected during the listening period. After a beacon frame, the method further includes:
  • the second access point determines the time at which the next listening period begins based on the network allocation vector NAV of the duration field in the first beacon frame.
  • the method further includes: After the set time, the second access point initiates long-distance listening to the first beacon frame, and broadcasts the long-listening start to each node device in the second basic service set. Instructing each node device in the second basic service set to pause requesting access to the second access point within the long listening time range.
  • the method further includes: When the access point detects that the saturation access degree of the first access point is less than the first threshold, the second access point stops listening to the first beacon frame, indicating the first connection.
  • the ingress point reduces a backoff time of the node device in the first basic service set of the overlap region, the saturation access level being used by the first access point to process a service within a first set time The proportion of time is determined.
  • the method further includes: if the second The basic service set exists that the third node device in the overlapping area needs to increase the probability of accessing the second access point, and the second access point expands itself to transmit the broadcast range of the second beacon frame to facilitate the The first access point listens to the second beacon frame sent by the second access point, so that the first access point enters itself according to the second beacon frame sent by the second access point. Listening to the second beacon frame sent by the third node device to determine an upper limit of data transmission power between the first node device and the first access point;
  • the second beacon frame is a frame in the RTS/CTS protocol format.
  • the power adjustment method of the present invention determines whether the first node device is in an overlapping area between the first basic service set and the second basic service set according to the data field and the RSSI in the first beacon frame, if the first node device is in the The overlapping area determines the data transmission power between the second node device and the second access point according to the RSSI, and adjusts the data transmission power of the second node device accordingly, so that the second basic service
  • the set of services may not interfere with the transmission of the first access point and the data of the first node device in the overlapping area, and improve the concurrent transmission probability of the first basic service set and the second basic service set.
  • Figure la is a flowchart of a power adjustment method according to Embodiment 1 of the present invention.
  • Figure lb is a network diagram of an overlapping area between the first basic service set and the second basic service set;
  • FIG. 2a is a flowchart of a power adjustment method according to Embodiment 2 of the present invention.
  • 2b is a schematic diagram of a first basic service set with node devices in an overlapping area and a second basic service set adjusting power
  • FIG. 2c is a schematic diagram of mutual sensing of a first basic service set and a second basic service set
  • FIG. 3 is a structural block diagram of a power adjustment apparatus according to Embodiment 3 of the present invention.
  • FIG. 4 is a block diagram showing the structure of a power adjustment apparatus according to Embodiment 4 of the present invention.
  • FIG. 5 is a structural block diagram of a power adjustment apparatus according to Embodiment 5 of the present invention. detailed description
  • FIG. la is a flow chart of a power adjustment method according to Embodiment 1 of the present invention. As shown in Figure la, the power adjustment method mainly includes:
  • Step S110 If the second access point of the second basic service set detects the first beacon frame during the listening period, the second access point according to the received signal strength in the first beacon frame. Instructing the RSSI and the data field to determine whether the first node device is in an overlapping area between the first basic service set and the second basic service set, and the first node device is in the first basic service set A node device of an access point.
  • the single frequency network may include multiple basic service sets (BSS), and each BSS may include one access point (AP), such as a base station, and multiple node devices accessing the AP, such as a mobile phone, a tablet, and an in-vehicle mobile device.
  • the node device can send a beacon frame to the AP to request access to the AP for data transmission when the carrier is idle. Only one node device can access the AP for data transmission at the same time.
  • the first basic service set includes a first access point, the node device accessing the first access point in the first basic service set is a first node device, and the second basic service set includes a second access point and access There are overlapping areas between the first basic service set and the second basic service set of the multiple node devices of the two access points.
  • Figure lb is a network diagram of an overlapping area between the first basic service set and the second basic service set.
  • BSS1 is the first basic service set
  • API is the first access point
  • BSS2 is the second basic service set
  • AP2 is the second access point
  • node devices 5-7 are the node devices of BSS2, where the shaded part is the overlapping area of BSS1 and BSS2, and the node device 4 is overlapping. region.
  • the second basic service set may include a listening period, a transmission period, and a contention access period.
  • Second The period during which the access point performs data transmission with the node device in the second basic service set is the transmission period.
  • the time period for requesting access to the second access point is a contention access period.
  • the period in which the second access point suspends data transmission and listens to the first beacon frame broadcasted by the first basic service set is a listening period.
  • the listening period is in the transmission period.
  • the second access point may trigger its own listening period, suspend the currently ongoing data transmission, and start to listen to the first basic service set.
  • the first beacon frame of the broadcast is the transmission period.
  • the first beacon frame is configured to send/allow transmission.
  • the second access point indicates the RSSI and the data field according to the received signal strength in the first beacon frame, and determines whether the first node device is An overlapping area between the first basic service set and the second basic service set, including:
  • the second access point determines, according to the RSSI, whether the first node device is in the overlapping area.
  • the first beacon frame is a frame that uses a request to send/allow to send an RTS/CTS protocol format, where the first beacon frame includes a data field and a received signal strength indicator RSSI, and the data field may identify that the first beacon frame is from the first beacon frame.
  • the first access point is also from the first node device, and the RSSI can indicate the received signal strength. Therefore, the second access point may determine, according to the data field, whether the broadcast of the first beacon frame is the first node device.
  • the second access point may determine the distance between the first node device and the second access point according to the RSSI. The stronger the RSSI, the closer the first node device is to the second access point; the lower the RSSI, the further the first node device is from the second access point. If RSSI Above or equal to the set threshold, the second access point may determine that the first node device is in the overlapping region. For example, referring to FIG. 1b, it is assumed that the node device 4 broadcasts the first beacon frame, the data field in the first beacon frame is "2", the RSSI is "50”, and the threshold is set to "44".
  • AP2 may determine that the first beacon frame is from node device 4.
  • AP2 can detect the first beacon frame and the RSSI is "50" greater than "44", then AP2 can determine that node device 4 is in the overlapping region of BSS1 and BSS2. In line with the actual.
  • the method further includes:
  • NAV network allocation vector
  • the first beacon frame further includes a duration field, and the duration field includes a network allocation vector.
  • the second access point may calculate the time required to wait according to the NAV, that is, the time at which the first beacon frame is received next time, that is, the time at which the next listening period of the second access point starts, thereby continuously listening First beacon frame.
  • the second access point may broadcast the time of the next listening period in the second basic service set, so that all node devices in the second basic service set may The avoidance does not interfere with the second access point to listen to the first beacon frame in the next listening period, and ensures that the second access point effectively listens to the first basic service set even if the next listening period occurs in the non-data transmission period.
  • the first beacon frame The first beacon frame.
  • Step S130 When the first node device is in the overlapping area, the second access point determines, according to the RSSI, data transmission power between the second node device and the second access point.
  • the upper node, the second node device is a node device that accesses the second access point in the second basic service set.
  • the second access point can determine the Detect Whether the data transmission during the listening period is uplink or downlink.
  • the uplink means that the second node device sends data to the second access point
  • the downlink means that the second access point sends data to the second node device.
  • the second access point determines the data transmission power of the data transmission that is suspended during the listening period according to the situation of the listening period, including the following two situations:
  • Case 1 The data transmission paused during the listening period is downlink, and the second access point can select the data transmission power according to the listening situation.
  • the second access point may reduce the data transmission power of the data transmission that is suspended during the listening period, and the data transmission power is reduced to just not interfere with the first
  • a basic service concentrates the node devices in the overlapping area to access the first access point and the transmission of data.
  • the node equipment in the overlapping area of the first basic service set interferes with the transmission of the first access point and the data; if the data transmission power is reduced too much, although the first basic service set is not interfered with
  • the node device in the overlapping area accesses the transmission of the first access point and the data, but the data transmission power of the second basic service set decreases too much, and the data transmission rate also decreases accordingly, reducing the first basic service set and the second The probability of concurrent transmission of the basic service set.
  • the concurrent transmission probability refers to the probability that the first basic service set and the second basic service set simultaneously perform data transmission.
  • the second access point adjusts the data transmission power according to the method for blindly adjusting the data transmission power in the embodiment of the present invention to equalize the node equipment and the concurrent transmission probability that do not interfere with the overlapping area in the first basic service set,
  • the node device in the overlapping area does not interfere with the transmission of the first access point and the data in the first basic service set, and the node device in the overlapping area does not interfere with the first basic service set to access the first access point.
  • the data transmission power is as high as possible.
  • the second access point may not adjust the data transmission power of the data transmission that is suspended during the listening period, or the second access point may The data transmission power of the data transmission suspended during the listening period is appropriately increased without interfering with the first basic service set.
  • Case 2 The data transmission suspended during the listening period is uplink, and the second node device can be based on the interception situation. Select the data transmission power.
  • the second access point may broadcast the situation of the interception in the second basic service set and the remaining duration of the data transmission in the interception period to feedback the situation of the interception.
  • the second node device can adjust its own data transmission power in time according to the situation detected by the second access point and the remaining period of the transmission period of the data transmission suspended during the listening period.
  • the second node device may reduce its own data transmission power, and the data transmission power is reduced to a node device that does not interfere with the overlapping area in the first basic service set. Access to the first access point and data transmission is sufficient.
  • the node equipment in the overlapping area of the first basic service set is interfered; if the data transmission power is reduced too much, although the node equipment in the overlapping area of the first basic service set is not interfered, the second node equipment The data transmission power is reduced too much, the data transmission power of the second basic service set is reduced too much, and the data transmission rate of the second basic service set is correspondingly reduced too much, and the first basic service set and the second basic service set are lowered. Concurrent transmission probability.
  • the second node device in the embodiment of the present invention adjusts its own data transmission power to equalize the node device and the concurrent transmission probability that do not interfere with the overlapping area in the first basic service set.
  • Do not interfere with the node equipment in the overlapping area of the first basic service set that is, under the premise of not interfering with the transmission of the first access point and the data by the node device in the overlapping area in the first basic service set,
  • the data transmission power of the second node device is high.
  • the second access point determines that the first node device is in the non-overlapping region, the second node device may not adjust its own data transmission power, or the second node device may not interfere with the first basic service set. , appropriately increase its own data transmission power.
  • the data transmission rate between the second node device and the second access point may also be determined. According to the power attenuation of the second node device, the received signal strength can be obtained. Referring to the data transmission power supported by the 802.11a standard network system and the data transmission rate supported by the data transmission power, as shown in Table 1 below. As shown, the data transmission rate between the second node device and the second access point is determined.
  • Table 1 Received signal power and supported data transmission rate in the 802.11a standard network system
  • the second node device and the second node device For example, if the data transmission power between the second node device and the second access point is adjusted to ensure that the second basic service set does not interfere with the first node device in the overlap region, the second node device and the second node device
  • the data transmission rate between the two access points is less than 6 megabits per second (Mbps)
  • the second node device is far from the second access point
  • the adjusted second node device is connected to the second access point.
  • the data transmission power is less than -82 dBm (dbm), temporarily stopping the data transmission of the second basic service set.
  • the power adjustment method of the embodiment of the present invention is described by using a single frequency network as an example, those skilled in the art can understand that the present invention is not limited thereto. In fact, the present invention is also applicable to power adjustment of a wireless local area network WLAN such as a multi-frequency network.
  • the power adjustment method of the embodiment of the present invention determines, according to the data field and the RSSI in the first beacon frame, whether the first node device is in an overlapping area between the first basic service set and the second basic service set, if the first node The device is in an overlapping area, determining data transmission power between the second node device and the second access point according to the RSSI, and adjusting data transmission power of the second node device accordingly, so that the second basic service set may not interfere with the overlapping area.
  • the first node device accesses the transmission of the first access point and the data, and improves the concurrent transmission probability of the first basic service set and the second basic service set.
  • FIG. 2a is a flow chart of a power adjustment method according to Embodiment 2 of the present invention.
  • the same steps in Fig. 2a as those in Fig. la have the same functions, and a detailed description of these steps will be omitted for the sake of brevity.
  • the power adjustment method shown in FIG. 2a may further include: Step S210: If the second access point does not hear the first beacon frame during the previous listening period, after the set time, the second access point starts to the first letter. Long listening of the frame, and broadcasting the long-listening start to each node device in the second basic service set to indicate that each node device in the second basic service set is in the long-term listening The request to access the second access point is suspended within the time range.
  • the second access point may pause the data transmission to listen to the first beacon frame of the first basic service set broadcast during the listening period. If the second access point does not hear the first beacon frame broadcast by the first basic service set during the previous listening period, thereby failing to determine when to enter the next listening period, in this case, the second access After the point can be separated by a preset T time, the long-listening is started to actively listen to the first beacon frame broadcasted by the first basic service set, and then enters the transmission period and the listening period again, and the loop is continuously executed.
  • FIG. 2b is a schematic diagram of a first basic service set with node devices in an overlapping area and a second basic service set to adjust power.
  • BSS1 includes a transmission period and a contention access period
  • BSS2 includes long listening. Period, transmission period, listening period and competition access period. For the transmission period and the contention access period, refer to the related description of step S110 in the first embodiment.
  • the access point of the BSS2 can detect whether the BSS1 broadcasts the first beacon frame in real time. When the BSS1 broadcasts the first beacon frame, the access point of the BSS2 can trigger its own listening period, and the suspension is currently in progress.
  • the data transmission begins to listen to the first beacon frame broadcast by BSS1.
  • the access point of the BSS2 may detect the first beacon frame during the listening period, and may not hear the first beacon frame.
  • the data transmission between the node device of the BSS2 and the access point of the BSS2 may be adjusted according to the related description in step S110 and step S130 in the first embodiment. Power; in the case that the access point of the BSS2 does not hear the first beacon frame, the data transmission power between the node device of the BSS2 and the access point of the BSS2 may not be adjusted, waiting for the next transmission period and the listening period.
  • the access point of the bay ljBSS2 can be broadcasted in the BSS2 for 10 seconds (second, s) to initiate long-listening, the node of the BSS2 The device pauses to request access during the long listening period. The access point of BSS2 does not interfere with the long listening of the access point of BSS2.
  • the power adjustment method may further include: when the second access point detects that the saturation access degree of the first access point is less than a first threshold, Stopping, by the second access point, the first beacon frame, instructing the first access point to reduce a backoff time of a node device in the first basic service set in the overlapping area, the saturation
  • the degree of access is determined by the proportion of time that the first access point is used to process traffic during the first set time.
  • the backoff time is an access request sent by the node device in the first basic service set when detecting that the first access point is idle, and colliding with an access request sent by another node device in the first basic service set. The time between when the access request is sent again.
  • the first basic service set includes a first access point, a node device 1, a node device 2, a node device 3, and a node device 4, the node device 4 is in an overlapping area, and the second basic service set includes a second The access point, the second access point detects that the saturation access degree of the first access point is less than the first threshold. Then, the second access point pauses to listen to the first beacon frame, and instructs the first access point to reduce the backoff time of the node device 4.
  • Gp reducing the access request sent by the node device 4 to the first access point when the first access point is idle, the access request sent by the node device 4 to the first access point, and the node device 1, the node device 2 The time interval between the node device 4 and the first access point sending the access request again after the collision with the access request sent by the node device 3 to the first access point.
  • the effective interception efficiency of the second access point is low, and the broadcast is expanded by the first basic service set.
  • the impact of a beacon frame is also large; when the second access point detects that the saturation access degree of the first access point is higher than or equal to the first threshold, the effective accession shrinkage efficiency of the second access point is high.
  • the effect of expanding the first beacon frame by the first basic service set is small. Therefore, if the second access point detects that the saturation access degree of the first access point is higher than or equal to the first threshold or the number of node devices in the overlapping area is large, the method is switched to the description in the first embodiment of the present invention.
  • Power adjustment method stopping the first embodiment when the second access point detects that the saturation access degree of the first access point is less than the first threshold or the number of node devices in the overlapping area is small
  • the power adjustment method described in the second access point may indicate that the first access point reduces the backoff time of the first node device in the overlapping area, thereby increasing the priority of the first node device in the overlapping area, so as to improve the overlapping.
  • the probability that the first node device of the area accesses the first access point.
  • the second access point may instruct the first access point to adjust the backoff time of the first node device in the overlapping area, so that the backoff time of the first node device in the overlapping area is smaller than that of the other node devices in the first basic service set.
  • the backoff time, or the backoff time of the first node device in the overlapping area is smaller than the backoff time average of all the node devices in the first basic service set.
  • the previous access point of the first access point ends.
  • the access probability of the first node device in the overlapping area to compete for access to the first access point increases; If the overlapping area is covered by the second basic service set, the first node device in the overlapping area does not have the opportunity to contend for accessing the first access point, and the node device in the non-overlapping area in the first basic service set waits for the opportunity to compete. Enter the first access point.
  • the power adjustment method may further include: if the second basic service set exists, the third node device that is in the overlapping area needs to improve access to the second access point. a probability that the second access point expands itself to transmit a broadcast range of the second beacon frame so that the first access point listens to the second beacon frame sent by the second access point, so that the The first access point, according to the second beacon frame sent by the second access point, enters its own listening period, and listens to the second beacon frame sent by the third node device to determine the first node.
  • the listening power control of the second basic service set may be in accordance with step S110 and the steps in the foregoing Embodiment 1.
  • the power adjustment method described in S130 performs power control, or steps according to this embodiment
  • the power adjustment method described in S210 and FIGS. 2a and 2b performs power control.
  • the second basic service set also has a small number of node devices in the overlapping area
  • power control is performed in addition to the power adjustment method described in step S110 and step S130, or power control is performed in accordance with the power adjustment method described in step S210 and FIGS. 2a and 2b.
  • the second access point further needs to expand the broadcast range of the second beacon frame, so that the first access point conveniently listens to the second beacon frame sent by the second access point, so that the first access The point determines the time at which the self-listening period begins according to the second beacon frame sent by the second access point.
  • the first access point enters its own listening period to listen to the second beacon frame. If the first access point detects the second beacon frame during its own listening period, the first access point is based on the interception. And the data field in the second beacon frame to determine whether the second beacon frame is from the third node device. In the case where the second beacon frame is from the third node device, the first access point indicates the RSSI according to the received signal strength in the second beacon frame, and determines whether the third node device is in the overlapping region. In case the third node device is in the overlapping area, the first access point determines an upper limit of the data transmission power between the first node device and the first access point according to the RSSI.
  • the first access point may determine itself according to the network allocation vector NAV of the duration field in the second beacon frame. The moment when the next listening period begins.
  • the first access point does not hear the second beacon frame during the previous listening period, after the first access point passes the set time, start long listening on the second beacon frame. And broadcasting the long-listening start to each node device in the first basic service set to indicate that each node device in the first basic service set suspends requesting access to the first access point within a long listening time range.
  • the first access point may stop listening to the second beacon frame, indicating the second access.
  • the point reduces the backoff time of the node device in the second basic service set in the overlapping area.
  • FIG. 2c is a schematic diagram of the first basic service set and the second basic service set listening to each other.
  • the second basic service set is sent to the second basic service set. Broadcast The remaining time length, the first access point listens to the second beacon frame, SP: the first access point listens to the feedback information of the second basic service set and then performs data transmission after each contention access, the feedback information is Second beacon frame.
  • the first access point knows when to pause the power adjustment for the second basic service set access situation interception during the transmission period.
  • the node devices are in an overlapping area. It is recommended to expand the distance between the first basic service set and the second basic service set, and reduce the first basic service set. The area of the overlap area with the second basic set of services.
  • the data transmission power between the second node device and the second access point is determined according to the RSSI, and the data transmission of the second node device is adjusted accordingly.
  • the second basic service set may not interfere with the transmission of the first access point and the data of the first access point in the overlapping area, and improve the concurrent transmission probability of the first basic service set and the second basic service set. If it is detected that the saturation access degree of the first access point is less than the first threshold, indicating that the first access point reduces the backoff time of the first node device in the overlapping area, the first node device access in the overlapping area may be improved. The probability of the first access point.
  • the node device in the overlapping area of the second basic service set needs to increase the probability of accessing the second access point, and expand the broadcast range of the second beacon frame, the first basic service set and the second basic service set detect each other. Listening, the data transmission power of the second node device can be adjusted more accurately, and the concurrent transmission probability of the first basic service set and the second basic service set is improved.
  • FIG. 3 is a structural block diagram of a power adjustment apparatus according to Embodiment 3 of the present invention.
  • the power adjustment device 300 of this embodiment is used to implement the power adjustment method of the first embodiment shown in FIG.
  • the power adjustment apparatus 300 mainly includes a listening module 320, a processing module 310, and a determining module 330.
  • the listening module 320 is configured to listen to the first beacon frame during the listening period.
  • the processing module 310 is connected to the listening module 320, and configured to: according to the first beacon frame, if the listening module 320 detects the first beacon frame during the listening period, Receiving letter The number strength indicator indicates the RSSI and the data field, and determines whether the first node device is in an overlapping area between the first basic service set and the second basic service set, and the first node device is inscribed in the first basic service set The node device that enters the first access point.
  • Power adjustment device 300 can be an access point (AP), such as a base station.
  • the single frequency network may include multiple basic service sets (BSS), each BSS may include one AP, and multiple node devices accessing the AP, such as a mobile phone, a tablet, an in-vehicle mobile device, etc., the node device may be in the detect When the carrier is idle, the beacon frame is sent to the AP to request access to the AP for data transmission. Only one node device can access the AP for data transmission at the same time.
  • the first basic service set includes a first access point, where the node device accessing the first access point in the first basic service set is the first node device, and the second basic service set includes the power adjustment device 300 and the access power adjustment There are overlapping areas between the plurality of node devices of the device 300, the first basic service set, and the second basic service set. For a specific example, refer to the related description in step S110 in the first embodiment.
  • the second basic service set may include a listening period, a transmission period, and a contention access period.
  • the period during which the power adjustment device 300 performs data transmission with the node device in the second basic service set is the transmission period.
  • the time period for requesting access to the power adjustment device 300 is a contention access period.
  • the power adjustment device 300 suspends the data transmission and listens to the period of the first beacon frame broadcast by the first basic service set as the listening period.
  • the listening period is in the transmission period.
  • the power adjustment device 300 can trigger its own listening period, suspend the ongoing data transmission, and the listening module 320 starts to listen to the first.
  • the first beacon frame broadcast by the basic service set.
  • the first beacon frame is a frame that uses the request to send/allow to send the RTS/CTS protocol format
  • the processing module 310 is specifically configured to:
  • the first beacon frame is a frame that uses a request to send/allow to send an RTS/CTS protocol format, where the first beacon frame includes a data field and a received signal strength indicator RSSI, and the data field may identify that the first beacon frame is from the first beacon frame.
  • the first access point is also from the first node device, and the RSSI can indicate the received signal strength.
  • the processing module 310 can determine, according to the data field, whether the broadcast of the first beacon frame is the first node device. If the processing module 310 determines that the first beacon frame is broadcast by the first node device, the processing module 310 may determine the distance between the first node device and the power adjustment device 300 according to the RSSI. The stronger the RSSI, the closer the first node device is to the power adjustment device 300; the lower the RSSI, the further the first node device is from the power adjustment device 300. If the RSSI is higher than or equal to the set threshold, the processing module 310 can determine that the first node device is in the overlapping region.
  • the node device 4 broadcasts the first beacon frame, the data field in the first beacon frame is "2", the RSSI is "50”, and the threshold is set to "44". If the listening module 320 of AP2 hears the first beacon frame and the data field is "2", the processing module 310 can determine that the first beacon frame is from the node device 4. The processing module 310 can detect the first beacon frame and the RSSI is "50" greater than "44", then the processing module 310 can determine that the node device 4 is in the overlapping region of BSS1 and BSS2. In line with the actual.
  • the determining module 330 is connected to the processing module 310, and configured to: when the processing module 310 determines that the first node device is in the overlapping area, determine, according to the RSSI, the second node device and the The upper limit of the data transmission power between the power adjustment devices 300, wherein the second node device is a node device that accesses the power adjustment device 300 in the second basic service set.
  • the processing module 310 can determine whether the data transmission paused during the listening period is uplink or downlink.
  • the uplink means that the second node device sends data to the power adjustment device 300, and the downlink refers to the power adjustment device 300 transmits data to the second node device.
  • the determining module 330 determines that the listening period is suspended according to the situation that the listening module 320 listens during the listening period.
  • the data transmission power of data transmission includes the following two cases:
  • Case 1 The data transmission paused during the listening period is downlink, and the determining module 330 can select the data transmission power according to the listening situation.
  • the determining module 330 may reduce the data transmission power of the data transmission that is suspended during the listening period, and the data transmission power is reduced to not interfere with the first basic service set.
  • the node device in the overlapping area can access the transmission of the first access point and data.
  • the node equipment in the overlapping area of the first basic service set interferes with the transmission of the first access point and the data; if the data transmission power is reduced too much, although the first basic service set is not interfered with
  • the node device in the overlapping area accesses the transmission of the first access point and the data, but the data transmission power of the second basic service set decreases too much, and the data transmission rate also decreases accordingly, reducing the first basic service set and the second The probability of concurrent transmission of the basic service set.
  • the concurrent transmission probability refers to the probability that the first basic service set and the second basic service set simultaneously perform data transmission.
  • the power adjustment apparatus 300 of the embodiment of the present invention adjusts the data transmission power to equalize the node equipment and the concurrent transmission probability that do not interfere with the overlapping area in the first basic service set, so that The node device that does not interfere with the first basic service set in the overlapping area accesses the first access point and the data is referenced, that is, the node device that is in the overlapping area does not interfere with the first basic service set accesses the first access point and Under the premise of data transmission, the data transmission power is as high as possible.
  • the determining module 330 may not adjust the data transmission power of the data transmission paused during the listening period, or the determining module 330 may not interfere with the first basic In the case of a service set, the data transmission power of the data transmission suspended during the listening period is appropriately increased.
  • Case 2 The data transmission suspended during the listening period is uplink, and the second node device can select the data transmission power according to the listening situation.
  • the processing module 310 may broadcast the situation of the interception in the second basic service set and the remaining duration of the transmission period of the data transmission suspended during the listening period, so as to be intercepted. The situation is fed back to the second node device.
  • the second node device can adjust its own data transmission power in time according to the situation that the interception module 320 detects during the listening period and the remaining duration of the data transmission period during which the listening period is suspended.
  • the processing module 310 determines that the first node device is in the overlapping area, the second node device may reduce its own data transmission power, and the data transmission power is reduced to the node device access that does not interfere with the overlapping area in the first basic service set.
  • the transmission of the first access point and data is sufficient. If the data transmission power is reduced too little, the node equipment in the overlapping area of the first basic service set is interfered; if the data transmission power is reduced too much, although the node equipment in the overlapping area of the first basic service set is not interfered, the second node equipment The data transmission power is reduced too much, the data transmission power of the second basic service set is reduced too much, and the data transmission rate of the second basic service set is correspondingly reduced too much, reducing the first basic service set and the second basic service set. Concurrent transmission probability.
  • the second node device in the embodiment of the present invention adjusts its own data transmission power to equalize the node device and the concurrent transmission probability that do not interfere with the overlapping area in the first basic service set. Do not interfere with the node equipment in the overlapping area of the first basic service set, that is, under the premise of not interfering with the transmission of the first access point and the data of the node equipment in the overlapping area in the first basic service set, The data transmission power of the second node device is high.
  • the second node device may not adjust its own data transmission power, or the second node device may not properly interfere with the first basic service set. Increase its own data transmission power.
  • the determining module 330 determines the data transmission power between the second node device and the power adjusting device 300
  • the data transmission rate between the second node device and the power adjusting device 300 may also be determined.
  • the related description in step S130 in the first embodiment refer to the related description in step S130 in the first embodiment.
  • the determining module 330 is connected to the listening module 320, and configured to determine a next listening period according to a network allocation vector NAV of a duration field in the first beacon frame. The moment of the beginning.
  • the first beacon frame further includes a duration field, and the duration field includes a network.
  • the determining module 330 can calculate the time required to wait according to the NAV, gp: can determine the time of receiving the first beacon frame next time, that is, determine the time at which the listening module 320 performs the listening period of the next listening, thereby continuously detecting Listen to the first beacon frame.
  • the power adjustment apparatus 300 may broadcast the start of the next listening period in the second basic service set after the determining module 330 receives the NAV to determine the start time of the next listening period during the listening period, so that all of the second basic service set
  • the node device can perform the avoidance and non-interference power adjustment device 300 to listen to the first beacon frame in the next listening period, and ensure that the listening module 320 effectively listens to the first basic service even if the next listening period occurs in the non-data transmission period.
  • the first beacon frame of the set may broadcast the start of the next listening period in the second basic service set after the determining module 330 receives the NAV to determine the start time of the next listening period during the listening period, so that all of the second basic service set
  • the node device can perform the avoidance and non-interference power adjustment device 300 to listen to the first beacon frame in the next listening period, and ensure that the listening module 320 effectively listens to the first basic service even if the next listening period occurs in the non-data transmission period.
  • the processing module determines, according to the data field and the RSSI in the first beacon frame that the interception module listens, whether the first node device is between the first basic service set and the second basic service set.
  • the overlapping area if the first node device is in the overlapping area, the determining module determines the data transmission power between the second node device and the power adjusting device according to the RSSI, and adjusts the data transmission power of the second node device accordingly, so that the second basic service set
  • the transmission of the first access point and the data by the first node device in the overlapping area may not be interfered, and the concurrent transmission probability of the first basic service set and the second basic service set may be improved.
  • FIG. 4 is a block diagram showing the structure of a power adjusting apparatus according to Embodiment 4 of the present invention.
  • the power adjustment device 400 of this embodiment is used to implement the power adjustment method of the second embodiment shown in Fig. 2a.
  • the components in Fig. 4 having the same reference numerals as those in Fig. 3 have the same functions, and a detailed description of these components will be omitted for the sake of brevity.
  • the processing module 410 is further configured to: if the listening module 420 is in the previous one.
  • the first beacon frame is not detected during the period, and after a set time, long listening to the first beacon frame is started, and the node device broadcasts to each node device in the second basic service set
  • the long listening starts to start, to indicate that each node device in the second basic service set pauses to request access to the power adjustment device 400 of the second basic service set within the long listening time range.
  • the power adjustment device 400 may suspend data transmission during the listening period to enable the listening module 420 to listen to the first beacon frame broadcast by the first basic service set.
  • the processing module 410 may initiate a long listening to actively listen to the first beacon frame broadcasted by the first basic service set, and then enter the transmission period and the listening period again, and the loop is continuously executed.
  • the processing module may initiate a long listening to actively listen to the first beacon frame broadcasted by the first basic service set, and then enter the transmission period and the listening period again, and the loop is continuously executed.
  • the processing module 410 is further configured to stop listening when the listening module 420 detects that the saturation access degree of the first access point is less than a first threshold. Determining, by the first access point, that the first access point reduces a backoff time of a node device in the first basic service set in the overlapping area, where the saturation access degree is determined by the first connection The proportion of time that the entry point is used to process the service during the first set time is determined.
  • the backoff time is an access request sent by the node device in the first basic service set when detecting that the first access point is idle, and colliding with an access request sent by another node device in the first basic service set. The time between when the access request is sent again.
  • step S210 refer to the related description in step S210 in the above second embodiment.
  • the listening module 420 detects that the saturation access degree of the first access point is less than the first threshold, the effective interception efficiency of the intercepting module 420 is low, and the first basic service set is expanded to broadcast the first letter.
  • the impact of the frame frame is also large; when the listening module 420 detects that the saturation access degree of the first access point is higher than or equal to the first threshold, the effective detection and contraction efficiency of the listening module 420 is high, and is subject to the first basic
  • the effect of the service set expanding the broadcast first beacon frame is small.
  • the mode is switched to the description in the first embodiment of the present invention.
  • the power adjustment method is performed.
  • the listening module 420 detects that the saturation access degree of the first access point is less than the first threshold or the number of node devices in the overlapping area is small, the power adjustment method described in Embodiment 1 is stopped, and the processing module is The 410 may instruct the first access point to reduce the backoff time of the first node device, thereby improving the priority of the first node device, so as to improve The probability that the first node device accesses the first access point.
  • the processing module 410 may instruct the first access point to adjust the backoff time of the first node device, so that the backoff time of the first node device is smaller than the backoff time of other node devices in the first basic service set, or make the first node device The backoff time is less than the average backoff time of all node devices in the first basic service set. The previous access point of the first access point ends.
  • the access probability of the first node device contending for access to the first access point increases; correspondingly, if overlapping The area is covered by the second basic service set, and the first node device does not have the opportunity to contend for access to the first access point, and the node device in the non-overlapping area in the first basic service set waits for the opportunity to contend for access to the first access point.
  • the processing module 410 is further configured to: if the second basic service set exists, the third node device that is in the overlapping area needs to increase access to the second basic service set. Adjusting the probability of the device 400, expanding the broadcast range of the second beacon frame to facilitate the first access point to listen to the second beacon frame sent by the power adjustment device 400 of the second basic service set, so that The first access point according to the second beacon frame sent by the power adjustment apparatus 400 of the second basic service set, enters its own listening period, and listens to the second beacon frame sent by the third node device, to Determining an upper limit of data transmission power between the first node device and the first access point; where the second beacon frame is a frame in the RTS/CTS protocol format.
  • the listening power control of the second basic service set may be in accordance with step S110 and the steps in the foregoing Embodiment 1.
  • the power adjustment method described in S130 performs power control, or performs power control according to the power adjustment method described in step S210 of this embodiment and FIGS. 2a and 2b.
  • the power control is performed in addition to the power adjustment method described in step S110 and step S130, or the power adjustment described in step S210 and FIG. 2a and FIG. 2b.
  • the processing module 410 further needs to expand the broadcast range of the second beacon frame, so that the first access point conveniently listens to the second beacon frame sent by the power adjustment device 400, and adjusts according to the power.
  • the second beacon frame transmitted by the device 400 determines the time at which the self-listening period begins.
  • the first access point enters its own listening period to listen to the second beacon frame. If the first access point detects the second beacon frame during its own listening period, the first access point is based on the interception. And the data field in the second beacon frame to determine whether the second beacon frame is from the third node device. In the case where the second beacon frame is from the third node device, the first access point indicates the RSSI according to the received signal strength in the second beacon frame, and determines whether the third node device is in the overlapping region. In case the third node device is in the overlapping area, the first access point determines an upper limit of the data transmission power between the first node device and the first access point according to the RSSI.
  • the first access point may determine itself according to the network allocation vector NAV of the duration field in the second beacon frame. The moment when the next listening period begins.
  • the first access point does not hear the second beacon frame during the previous listening period, after the first access point passes the set time, start long listening on the second beacon frame. And broadcasting the long-listening start to each node device in the first basic service set to indicate that each node device in the first basic service set suspends requesting access to the first access point within a long listening time range.
  • the first access point may stop listening to the second beacon frame, indicating that the power adjustment device 400 is reduced.
  • the backoff time of the node device in the second basic service set in the overlapping area may be stopped.
  • step S210 refer to the related description in step S210 in the above second embodiment.
  • the node devices are in an overlapping area. It is recommended to expand the distance between the first basic service set and the second basic service set to reduce the first basic service set. The area of the overlap area with the second basic set of services.
  • the power adjustment apparatus of the embodiment of the present invention if the listening module detects that the first node device is heavy a stacking area, the determining module determines, according to the RSSI, a data transmission power between the second node device and the power adjusting device, and correspondingly adjusts a data transmission power of the second node device, where the second basic service set may not interfere with the first node device in the overlapping area Accessing the transmission of the first access point and the data improves the concurrent transmission probability of the first basic service set and the second basic service set.
  • the processing module instructs the first access point to reduce the backoff time of the first node device in the overlapping area, thereby improving the The probability that a node device accesses the first access point.
  • the processing module expands the broadcast range of the second beacon frame, and the first basic service set and the second basic service set are mutually The interception can adjust the data transmission power of the second node device more accurately, and improve the concurrent transmission probability of the first basic service set and the second basic service set.
  • FIG. 5 is a structural block diagram of a power adjustment apparatus according to Embodiment 5 of the present invention.
  • the power adjustment device 500 may be a host server having a computing capability, a personal computer PC, or a portable computer or terminal that can be carried.
  • the specific embodiment of the present invention does not limit the specific implementation of the computing node.
  • the power adjustment apparatus 500 includes a processor 510, a communications interface 520, a memory array 530, and a bus 540.
  • the processor 510, the communication interface 520, and the memory 530 complete communication with each other via the bus 540.
  • the communication interface 520 is configured to communicate with a network element, wherein the network element includes, for example, a virtual machine management center, shared storage, and the like.
  • the processor 510 is for executing a program.
  • the processor 510 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • ASIC Application Specific Integrated Circuit
  • the memory 530 is used to store files.
  • Memory 530 may contain high speed RAM memory, or Also included is a non-volatile memory, such as at least one disk storage.
  • Memory 530 can also be a memory array.
  • Memory 530 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.
  • the above program may be a program code including computer operating instructions. This program can be used to:
  • the second access point of the second basic service set listens to the first beacon frame during the listening period, the second access point indicates RSSI and based on the received signal strength in the first beacon frame. a data field, determining whether the first node device is in an overlapping area between the first basic service set and the second basic service set, where the first node device accesses the first access in the first basic service set Point node device;
  • the second node device is a node device that accesses the second access point in the second basic service set.
  • the first beacon frame is a frame that uses a request to send/allow to send an RTS/CTS protocol format
  • the second access point is based on a received signal in the first beacon frame.
  • the strength indicator RSSI and the data field determine whether the first node device is in an overlapping area between the first basic service set and the second basic service set, including:
  • the second access point determines, according to the RSSI, whether the first node device is in the overlapping area.
  • the method further includes:
  • a network allocation vector of the second access point according to a duration field in the first beacon frame The amount of NAV, the time at which the next listening period begins.
  • the method further includes:
  • the second access point After the set time, the second access point initiates long-distance listening to the first beacon frame, and broadcasts the long-listening start to each node device in the second basic service set. Instructing each node device in the second basic service set to pause requesting access to the second access point within the long listening time range.
  • the method further includes:
  • the second access point When the second access point detects that the saturation access degree of the first access point is less than a first threshold, the second access point stops listening to the first beacon frame, indicating The first access point reduces a backoff time of a node device in the first basic service set in the overlap region, where the saturation access level is determined by the first access point in a first set time The proportion of time used to process the business is determined.
  • the method further includes:
  • the second access point expands itself to send the second beacon frame. Broadcasting the range so that the first access point listens to the second beacon frame sent by the second access point, so that the first access point sends the second letter according to the second access point.
  • the frame is configured to listen to the second beacon frame sent by the third node device to determine an upper limit of data transmission power between the first node device and the first access point;
  • the second beacon frame is a frame in the RTS/CTS protocol format.
  • the power adjustment apparatus of the embodiment of the present invention determines, according to the data field and the RSSI in the first beacon frame, whether the first node device is in an overlapping area between the first basic service set and the second basic service set, if the first node The device is in an overlapping area, and the data transmission power between the second node device and the power adjustment device is determined according to the RSSI, and the data transmission power of the second node device is adjusted accordingly, thereby
  • the second basic service set may not interfere with the transmission of the first access point and the data of the first node device in the overlapping area, and improve the concurrent transmission probability of the first basic service set and the second basic service set.
  • the function is implemented in the form of computer software and sold or used as a stand-alone product, it may be considered to some extent that all or part of the technical solution of the present invention (for example, a part contributing to the prior art) is It is embodied in the form of computer software products.
  • the computer software product is typically stored in a computer readable storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of various embodiments of the present invention.
  • the foregoing storage medium includes a USB flash drive, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviation: ROM), a random access memory (English: Random Access Memory, abbreviation: RAM), a magnetic disk or an optical disk, and the like.
  • ROM Read-Only Memory
  • RAM Random Access Memory

Landscapes

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

Abstract

本发明公开了一种功率调整方法及装置。其中，该功率调整方法包括：如果第二基本服务集的第二接入点在侦听期内侦听到第一信标帧，则第二接入点根据第一信标帧中的接收信号强度指示RSSI和数据字段，判断第一节点设备是否处于第一基本服务集和第二基本服务集之间的重叠区域；在第一节点设备处于重叠区域的情况下，第二接入点根据RSSI，确定第二节点设备与第二接入点之间的数据传输功率的上限。根据RSSI确定第二节点设备与第二接入点之间的数据传输功率，相应调整第二节点设备的数据传输功率，从而第二基本服务集可以不干扰处于重叠区域的第一节点设备接入第一接入点和数据的传输，提高了第一基本服务集和第二基本服务集的并发传输概率。

Description

功率调整方法及装置
技术领域
本发明涉及通信技术领域， 尤其涉及一种功率调整方法及装置。 背景技术
对于采用分布协调功能 (Distributed Coordination Function, DCF)竞争接 入机制的单频组网， 单频组网中可以存在多个基本服务集 (Basic Service Set, BSS)。 每个 BSS包括一个接入点 （Access Point, AP) 和多个通信节点设备， 通信节点设备只有侦听到载波空闲才能请求接入 AP,并且， 同一时刻只有一 个通信节点设备可以接入 AP进行数据传输。
当单频组网中的 BSS较多时， BSS所覆盖的范围存在重叠 （Overlap) 区 域， 假设处于重叠区域中的通信节点设备所隶属的 BSS为本区， 形成重叠的 另一个 BSS为邻区。 由于处于重叠区域中的通信节点设备在邻区传输覆盖的 范围内， 处于重叠区域中的通信节点设备侦听到载波空闲的几率低于本区中 的其它通信节点设备侦听到载波空闲的几率， 处于重叠区域中的通信节点设 备接入本区中的 AP的几率和进行数据传输的几率，也低于本区中的其它通信 节点设备接入本区中的 AP的几率和进行数据传输的几率。
通常， 在处于重叠区域中的通信节点设备有数据传输的需求时， 邻区中 的 AP可以降低邻区中的通信节点设备的数据传输功率，减小邻区中的通信节 点设备对重叠区域的覆盖， 从而不影响处于重叠区域中的通信节点设备的数 据传输， 以提高处于重叠区域中的通信节点设备接入本区中的 AP的几率。
但是，现有技术中无法准确的降低邻区中的通信节点设备的数据传输功 率。 若邻区中的通信节点设备的数据传输功率降低的太少， 则无法有效提升 处于重叠区域中的通信节点设备接入本区中的 AP的几率；若邻区中的通信节 发明内容
技术问题
有鉴于此， 本发明要解决的技术问题是， 如何准确调整邻区通信节点设 备的数据传输功率。
解决方案
为了解决上述技术问题，在第一方面，本发明提供了一种功率调整装置， 包括：
侦听模块， 用于在侦听期内侦听第一信标帧；
处理模块， 与所述侦听模块连接，用于如果所述侦听模块在所述侦听期 内侦听到所述第一信标帧， 则根据所述第一信标帧中的接收信号强度指示
RSSI和数据字段， 判断第一节点设备是否处于第一基本服务集和所述第二 基本服务集之间的重叠区域，所述第一节点设备为所述第一基本服务集内接 入第一接入点的节点设备；
确定模块， 与所述处理模块连接， 用于在所述处理模块判定所述第一节 点设备处于所述重叠区域的情况下， 根据所述 RSSI, 确定第二节点设备与所 述功率调整装置之间的数据传输功率的上限，所述第二节点设备为所述第二 基本服务集内接入所述功率调整装置的节点设备。
结合第一方面，在第一种可能的实现方式中，所述第一信标帧为采用请 求发送 /允许发送 RTS/CTS协议格式的帧， 所述处理模块具体用于：
根据所述数据字段， 判断所述第一信标帧是否来自所述第一节点设备； 在所述第一信标帧来自所述第一节点设备的情况下， 根据所述 RSSI, 判 断所述第一节点设备是否处于所述重叠区域。
结合第一方面或第一方面的第一种可能的实现方式，在第二种可能的实 现方式中， 所述确定模块与所述侦听模块连接， 用于根据所述第一信标帧中 的持续时间字段的网络分配矢量 NAV, 确定下一个侦听期开始的时刻。
结合第一方面的第二种可能的实现方式， 在第三种可能的实现方式中， 所述处理模块还用于如果所述侦听模块在前一个侦听期内未侦听到所述第 一信标帧， 经过设定时间之后， 启动对所述第一信标帧的长侦听， 并且向所 述第二基本服务集内的各个节点设备广播所述长侦听开始启动， 以指示所述 第二基本服务集内的各个节点设备在所述长侦听的时间范围内暂停请求接 入所述第二基本服务集的功率调整装置。
结合第一方面或第一方面的第一种可能的实现方式至第三种可能的实 现方式中的任意一种实现方式， 在第四种可能的实现方式中， 所述处理模块 还用于，在所述侦听模块侦听到所述第一接入点的饱和接入程度小于第一阈 值的情况下， 停止侦听所述第一信标帧， 指示所述第一接入点减少处于所述 重叠区域的所述第一基本服务集内的节点设备的退避时间，所述饱和接入程 度由所述第一接入点在第一设定时间内用于处理业务的时间比例所确定。
结合第一方面或第一方面的第一种可能的实现方式至第四种可能的实 现方式中的任意一种实现方式，在第五种可能的实现方式中，所述处理模块 还用于，如果所述第二基本服务集存在处于所述重叠区域内的第三节点设备 需要提高接入所述第二基本服务集的功率调整装置的几率，扩大发送第二信 标帧的广播范围以便于所述第一接入点侦听所述第二基本服务集的功率调 整装置发送的第二信标帧，以使得所述第一接入点根据所述第二基本服务集 的功率调整装置发送的第二信标帧，进入自身的侦听期侦听所述第三节点设 备发送的第二信标帧，以确定所述第一节点设备与所述第一接入点之间的数 据传输功率的上限；
其中， 所述第二信标帧为采用所述 RTS/CTS协议格式的帧。
在第二方面， 本发明提供了一种功率调整方法， 包括： 如果第二基本服务集的第二接入点在侦听期内侦听到第一信标帧，则所 述第二接入点根据所述第一信标帧中的接收信号强度指示 RSSI和数据字 段，判断第一节点设备是否处于第一基本服务集和所述第二基本服务集之间 的重叠区域，所述第一节点设备为所述第一基本服务集内接入第一接入点的 节点设备；
在所述第一节点设备处于所述重叠区域的情况下，所述第二接入点根据 所述 RSSI, 确定第二节点设备与所述第二接入点之间的数据传输功率的上 限，所述第二节点设备为所述第二基本服务集内接入所述第二接入点的节点 设备。
结合第二方面，在第一种可能的实现方式中，所述第一信标帧为采用请 求发送 /允许发送 RTS/CTS协议格式的帧， 所述第二接入点根据所述第一信 标帧中的接收信号强度指示 RSSI和数据字段， 判断第一节点设备是否处于 第一基本服务集和所述第二基本服务集之间的重叠区域， 包括：
所述第二接入点根据所述数据字段，判断所述第一信标帧是否来自所述 第一节点设备；
在所述第一信标帧来自所述第一节点设备的情况下，所述第二接入点根 据所述 RSSI, 判断所述第一节点设备是否处于所述重叠区域。
结合第二方面或第二方面的第一种可能的实现方式，在第二种可能的实 现方式中，所述如果第二基本服务集的第二接入点在侦听期内侦听到第一信 标帧之后， 所述方法还包括：
所述第二接入点根据所述第一信标帧中的持续时间字段的网络分配矢 量 NAV, 确定下一个侦听期开始的时刻。
结合第二方面的第二种可能的实现方式， 在第三种可能的实现方式中， 如果所述第二接入点在前一个侦听期内未侦听到所述第一信标帧，所述方法 还包括： 经过设定时间之后， 所述第二接入点启动对所述第一信标帧的长侦听， 并且向所述第二基本服务集内的各个节点设备广播所述长侦听开始启动， 以 指示所述第二基本服务集内的各个节点设备在所述长侦听的时间范围内暂 停请求接入所述第二接入点。
结合第二方面或第二方面的第一种可能的实现方式至第三种可能的实 现方式中的任意一种实现方式， 在第四种可能的实现方式中， 还包括： 在所述第二接入点侦听到所述第一接入点的饱和接入程度小于第一阈 值的情况下， 所述第二接入点停止侦听所述第一信标帧， 指示所述第一接入 点减少处于所述重叠区域的所述第一基本服务集内的节点设备的退避时间， 所述饱和接入程度由所述第一接入点在第一设定时间内用于处理业务的时 间比例所确定。
结合第一方面或第一方面的第一种可能的实现方式至第四种可能的实 现方式中的任意一种实现方式， 在第五种可能的实现方式中， 还包括： 如果所述第二基本服务集存在处于所述重叠区域内的第三节点设备需 要提高接入所述第二接入点的几率，所述第二接入点扩大自身发送第二信标 帧的广播范围以便于所述第一接入点侦听所述第二接入点发送的第二信标 帧， 以使得所述第一接入点根据所述第二接入点发送的第二信标帧，进入自 身的侦听期侦听所述第三节点设备发送的第二信标帧，以确定所述第一节点 设备与所述第一接入点之间的数据传输功率的上限；
其中， 所述第二信标帧为采用所述 RTS/CTS协议格式的帧。
有益效果
本发明的功率调整方法， 根据第一信标帧中的数据字段和 RSSI, 判断第 一节点设备是否处于第一基本服务集和第二基本服务集之间的重叠区域， 若 第一节点设备处于重叠区域，根据 RSSI确定第二节点设备与第二接入点之间 的数据传输功率， 相应调整第二节点设备的数据传输功率， 从而第二基本服 务集可以不干扰处于重叠区域的第一节点设备接入第一接入点和数据的传 输， 提高了第一基本服务集和第二基本服务集的并发传输概率。
根据下面参考附图对示例性实施例的详细说明，本发明的其它特征及方 面将变得清楚。 附图说明
包含在说明书中并且构成说明书的一部分的附图与说明书一起示出了 本发明的示例性实施例、 特征和方面， 并且用于解释本发明的原理。
图 la为根据本发明实施例一的功率调整方法的流程图；
图 lb为第一基本服务集和第二基本服务集之间的重叠区域的网络示意 图；
图 2a为根据本发明实施例二的功率调整方法的流程图；
图 2b为第一基本服务集有节点设备在重叠区且第二基本服务集调整功 率的示意图；
图 2c为第一基本服务集和第二基本服务集相互侦听的示意图； 图 3为根据本发明实施例三的功率调整装置的结构框图；
图 4为根据本发明实施例四的功率调整装置的结构框图； 以及
图 5为根据本发明实施例五的功率调整装置的结构框图。 具体实施方式
以下将参考附图详细说明本发明的各种示例性实施例、 特征和方面。 附 图中相同的附图标记表示功能相同或相似的元件。尽管在附图中示出了实施 例的各种方面， 但是除非特别指出， 不必按比例绘制附图。
在这里专用的词"示例性 "意为 "用作例子、 实施例或说明性"。 这里作为 "示例性"所说明的任何实施例不必解释为优于或好于其它实施例。 另外， 为了更好的说明本发明， 在下文的具体实施方式中给出了众多的 具体细节。 本领域技术人员应当理解， 没有某些具体细节， 本发明同样可以 实施。 在另外一些实例中， 对于本领域技术人员熟知的方法、 手段、 元件和 电路未作详细描述， 以便于凸显本发明的主旨。
实施例 1
图 la为根据本发明实施例一的功率调整方法的流程图。 如图 la所示， 该 功率调整方法主要包括：
步骤 S110、如果第二基本服务集的第二接入点在侦听期内侦听到第一信 标帧， 则所述第二接入点根据所述第一信标帧中的接收信号强度指示 RSSI 和数据字段，判断第一节点设备是否处于第一基本服务集和所述第二基本服 务集之间的重叠区域，所述第一节点设备为所述第一基本服务集内接入第一 接入点的节点设备。
单频组网中可以包括多个基本服务集 (BSS)，每个 BSS可以包括一个接入 点 （AP) 例如基站， 以及接入该 AP的多个节点设备例如手机、 平板电脑、 车载移动装置等，节点设备可以在侦听到载波空闲时向 AP发送信标帧以请求 接入 AP进行数据传输， 同一时刻只有一个节点设备能够接入 AP进行数据传 输。 第一基本服务集包括第一接入点， 第一基本服务集内的接入第一接入点 的节点设备为第一节点设备，第二基本服务集包括第二接入点和接入第二接 入点的多个节点设备， 第一基本服务集和第二基本服务集之间存在重叠区 域。 图 lb为第一基本服务集和第二基本服务集之间的重叠区域的网络示意 图， 如图 lb所示， BSS1为第一基本服务集， API为第一接入点， 节点设备 1〜 4为第一节点设备， BSS2为第二基本服务集， AP2为第二接入点，节点设备 5〜 7为 BSS2的节点设备， 图中阴影部分为 BSS1和 BSS2的重叠区域， 节点设备 4 处于重叠区域。
具体地， 第二基本服务集可以包括侦听期、 传输期和竞争接入期。 第二 接入点与第二基本服务集中的节点设备进行数据传输的时段为传输期。第二 基本服务集中的节点设备在检测到第二接入点空闲的情况下， 向第二接入点 请求接入的时段为竞争接入期。第二接入点暂停数据传输并侦听第一基本服 务集广播的第一信标帧的时段为侦听期，一般情况下，侦听期处于传输期中。 第二接入点检测到第一基本服务集准备广播第一信标帧时，第二接入点可以 触发自身的侦听期， 暂停当前正在进行的数据传输， 开始侦听第一基本服务 集广播的第一信标帧。
在一种可能的实现方式中， 所述第一信标帧为采用请求发送 /允许发送
(Request to Send/Clear to Send, RTS/CTS)协议格式的帧， 所述第二接入点根 据所述第一信标帧中的接收信号强度指示 RSSI和数据字段， 判断第一节点 设备是否处于第一基本服务集和所述第二基本服务集之间的重叠区域， 包 括：
所述第二接入点根据所述数据字段，判断所述第一信标帧是否来自所述 第一节点设备；
在所述第一信标帧来自所述第一节点设备的情况下，所述第二接入点根 据所述 RSSI, 判断所述第一节点设备是否处于所述重叠区域。
具体地， 不仅第一基本服务集中的第一接入点能够广播第一信标帧， 而 且， 第一基本服务集中的第一节点设备也能够广播第一信标帧。 该第一信标 帧为采用请求发送 /允许发送 RTS/CTS协议格式的帧，该第一信标帧中包括数 据字段和接收信号强度指示 RSSI,数据字段可以标识第一信标帧是来自于第 一接入点还是来自于第一节点设备， RSSI可以表示接收的信号强度。 因此， 第二接入点可以根据数据字段， 判断广播第一信标帧的是否是第一节点设 备。 若第二接入点判定第一信标帧是第一节点设备广播的， 第二接入点可以 根据 RSSI判断第一节点设备与第二接入点的距离。 RSSI越强，第一节点设备 距离第二接入点越近; RSSI越低，第一节点设备距离第二接入点越远。若 RSSI 高于或等于设定阈值， 则第二接入点可以判定第一节点设备处于重叠区域。 举例而言， 参见图 lb， 假设节点设备 4广播了第一信标帧， 该第一信标 帧中的数据字段为 "2"， RSSI为 "50"， 设定阈值为 "44"。 若 AP2检测到第 一信标帧且数据字段为 "2"， 则 AP2可以判定第一信标帧来自于节点设备 4。 AP2可以检测第一信标帧且 RSSI为 "50"大于 "44"， 则 AP2可以判定节点设 备 4处于 BSS1和 BSS2的重叠区域。 与实际相符。
在一种可能的实现方式中，如果第二基本服务集的第二接入点在侦听期 内侦听到第一信标帧之后， 所述方法还包括：
所述第二接入点根据所述第一信标帧中的持续时间字段的网络分配矢 量 (Net Allocation Vector, NAV), 确定所述第二接入点下一个侦听期开始的 时刻。
具体地， 该第一信标帧中还包括持续时间 （duration) 字段， 持续时间 字段中包括网络分配矢量。 第二接入点可以根据 NAV计算需要等待的时间， 即： 可以确定下一次接收第一信标帧的时间， 也就是确定第二接入点下一个 侦听期开始的时刻， 从而不断侦听第一信标帧。 第二接入点在侦听期接收 NAV确定下一个侦听期的开始时刻之后，可以在第二基本服务集中广播下一 个侦听期开始的时刻，从而第二基本服务集中的所有节点设备可以在下一个 侦听期进行回避不干扰第二接入点侦听第一信标帧， 即使下一个侦听期出现 在非数据传输期也能保证第二接入点有效侦听第一基本服务集的第一信标 帧。
步骤 S130、在所述第一节点设备处于所述重叠区域的情况下， 所述第二 接入点根据所述 RSSI,确定第二节点设备与所述第二接入点之间的数据传输 功率的上限，所述第二节点设备为所述第二基本服务集内接入所述第二接入 点的节点设备。
具体地， 第二接入点每次侦听第一信标帧之后， 第二接入点可以判断侦 听期暂停的数据传输是上行还是下行。 其中， 上行是指第二节点设备向第二 接入点发送数据， 下行是指第二接入点向第二节点设备发送数据。第二接入 点根据侦听期侦听的情况， 确定侦听期暂停的数据传输的数据传输功率， 包 括以下两种情况：
情况一、 侦听期暂停的数据传输是下行， 第二接入点可以根据侦听情况 选择数据传输功率。
具体地， 在第二接入点确定第一节点设备处于重叠区域的情况下， 则第 二接入点可以降低侦听期暂停的数据传输的数据传输功率，数据传输功率降 低到恰好不干扰第一基本服务集中处于重叠区域的节点设备接入第一接入 点和数据的传输即可。 若数据传输功率降低太少， 干扰了第一基本服务集中 处于重叠区域的节点设备接入第一接入点和数据的传输； 若数据传输功率降 低太多， 虽然不干扰第一基本服务集中处于重叠区域的节点设备接入第一接 入点和数据的传输， 但是第二基本服务集的数据传输功率下降太多， 数据传 输速率也相应降低太多， 降低了第一基本服务集和第二基本服务集的并发传 输概率。 其中， 并发传输概率是指第一基本服务集和第二基本服务集同时进 行数据传输的概率。 因此， 对比于通常的盲目调整数据传输功率的方法， 本 发明实施例的第二接入点调整数据传输功率是均衡了不干扰第一基本服务 集中处于重叠区域的节点设备和并发传输概率， 以恰好不干扰第一基本服务 集中处于重叠区域的节点设备接入第一接入点和数据的传输为基准， 即在不 干扰第一基本服务集中处于重叠区域的节点设备接入第一接入点和数据的 传输的前提下， 尽可能的使数据传输功率高。 相应地， 在第二接入点确定第 一节点设备处于非重叠区域的情况下， 则第二接入点可以不调整侦听期暂停 的数据传输的数据传输功率，或者第二接入点可以在不干扰第一基本服务集 的情况下， 适当地增大侦听期暂停的数据传输的数据传输功率。
情况二、 侦听期暂停的数据传输是上行， 第二节点设备可以根据侦听情 况选择数据传输功率。
具体地， 在侦听期结束之后， 第二接入点可以在第二基本服务集中广播 侦听到的情况和侦听期暂停的数据传输的传输期剩余时长， 以把侦听到的情 况反馈给第二节点设备。第二节点设备可以根据第二接入点侦听到的情况和 侦听期暂停的数据传输的传输期剩余时长， 及时地调整自身的数据传输功 率。 在第二接入点确定第一节点设备处于重叠区域的情况下， 则第二节点设 备可以降低自身的数据传输功率， 数据传输功率降低到恰好不干扰第一基本 服务集中处于重叠区域的节点设备接入第一接入点和数据的传输即可。若数 据传输功率降低太少， 干扰了第一基本服务集中处于重叠区域的节点设备； 若数据传输功率降低太多， 虽然不干扰第一基本服务集中处于重叠区域的节 点设备， 但是第二节点设备的数据传输功率降低太多， 第二基本服务集的数 据传输功率降低太多， 第二基本服务集的数据传输速率也相应降低太多， 降 低了第一基本服务集和第二基本服务集的并发传输概率。对比于通常的盲目 调整数据传输功率的方法， 本发明实施例的第二节点设备调整自身的数据传 输功率是均衡了不干扰第一基本服务集中处于重叠区域的节点设备和并发 传输概率， 以恰好不干扰第一基本服务集中处于重叠区域的节点设备为基 准， 即在不干扰第一基本服务集中处于重叠区域的节点设备接入第一接入点 和数据的传输的前提下， 尽可能的使第二节点设备的数据传输功率高。 在第 二接入点确定第一节点设备处于非重叠区域的情况下， 则第二节点设备可以 不调整自身的数据传输功率，或者第二节点设备可以在不干扰第一基本服务 集的情况下， 适当地增大自身的数据传输功率。
进一步地， 确定了第二节点设备与第二接入点之间的数据传输功率之 后， 还可以确定第二节点设备与第二接入点之间的数据传输速率。 可以根据 第二节点设备的功率衰减， 得到接收信号强度， 再参考 802.11a标准的网络系 统中数据传输功率与该数据传输功率支持的数据传输速率对照表， 如下表 1 所示， 确定第二节点设备与第二接入点之间的数据传输速率。
表 1 802.11a标准的网络系统中接收信号功率与支持的数据传输速率
Figure imgf000014_0001
举例而言，如果为了保证第二基本服务集不干扰处于重叠区域中的第一 节点设备而调整了第二节点设备与第二接入点之间的数据传输功率，使第二 节点设备与第二接入点之间的数据传输速率达不到 6兆比特每秒 （Mbps) 速 率， 第二节点设备距离第二接入点远， 调整后的第二节点设备与第二接入点 之间的数据传输功率小于 -82分贝毫瓦 (dbm)， 暂时停止第二基本服务集的数 据传输。
需要说明的是， 尽管以单频组网作为示例介绍了本发明实施例的功率调 整方法， 但本领域技术人员能够理解， 本发明应不限于此。 事实上， 本发明 也适用于多频组网等无线局域网络 WLAN的功率调整。
本发明实施例的功率调整方法， 根据第一信标帧中的数据字段和 RSSI, 判断第一节点设备是否处于第一基本服务集和第二基本服务集之间的重叠 区域， 若第一节点设备处于重叠区域， 根据 RSSI确定第二节点设备与第二接 入点之间的数据传输功率， 相应调整第二节点设备的数据传输功率， 从而第 二基本服务集可以不干扰处于重叠区域中的第一节点设备接入第一接入点 和数据的传输， 提高了第一基本服务集和第二基本服务集的并发传输概率。
实施例 2
图 2a为根据本发明实施例二的功率调整方法的流程图。 图 2a中标号与图 la相同的步骤具有相同的功能， 为简明起见， 省略对这些步骤的详细说明。
如图 2a所示， 图 2a所示的功率调整方法与图 la所示的功率调整方法的主 要区别在于， 除了包括步骤 S110和步骤 S130之外， 图 2a所示的功率调整方法 还可以包括： 步骤 S210、如果所述第二接入点在前一个侦听期内未侦听到所述第一信 标帧，经过设定时间之后，所述第二接入点启动对所述第一信标帧的长侦听， 并且向所述第二基本服务集内的各个节点设备广播所述长侦听开始启动， 以 指示所述第二基本服务集内的各个节点设备在所述长侦听的时间范围内暂 停请求接入所述第二接入点。
具体地，第二接入点在侦听期可以暂停数据传输侦听第一基本服务集广 播的第一信标帧。如果第二接入点在前一个侦听期没有侦听到第一基本服务 集广播的第一信标帧， 从而无法确定何时进入下一侦听期， 这种情况下， 第 二接入点可以间隔预先设定的 T时间后， 启动长侦听去主动侦听第一基本服 务集广播的第一信标帧， 之后再次进入传输期以及侦听期， 如此循环不断执 行。
举例而言， 图 2b为第一基本服务集有节点设备在重叠区且第二基本服务 集调整功率的示意图， 如图 2b所示， BSS1包括传输期和竞争接入期， BSS2 包括长侦听期、 传输期、 侦听期和竞争接入期。 传输期和竞争接入期可以参 见上述实施例一中步骤 S110的相关描述。 BSS2的接入点可以实时侦听 BSS1 是否广播第一信标帧， 在侦听到 BSS1广播第一信标帧的情况下， BSS2的接 入点可以触发自身的侦听期，暂停当前正在进行的数据传输，开始侦听 BSS1 广播的第一信标帧。 BSS2的接入点在侦听期有可能侦听到第一信标帧，也有 可能没有侦听到第一信标帧。 在 BSS2的接入点侦听到第一信标帧的情况下， 可以按照上述实施例一中步骤 S110和步骤 S130中的相关描述调整 BSS2的节 点设备与 BSS2的接入点之间的数据传输功率； 在 BSS2的接入点没有侦听到 第一信标帧的情况下， 可以不调整 BSS2的节点设备与 BSS2的接入点之间的 数据传输功率，等待下一个传输期和侦听期，如果 BSS2的接入点在前一个侦 听期没有侦听到第一信标帧， 贝 ljBSS2的接入点可以间隔 10秒 （second, s ) 在 BSS2内广播启动长侦听， BSS2的节点设备在长侦听期内暂停请求接入 BSS2的接入点， 不干扰 BSS2的接入点的长侦听。
在一种可能的实现方式中， 所述功率调整方法还可以包括： 在所述第二 接入点侦听到所述第一接入点的饱和接入程度小于第一阈值的情况下，所述 第二接入点停止侦听所述第一信标帧，指示所述第一接入点减少处于所述重 叠区域的所述第一基本服务集内的节点设备的退避时间，所述饱和接入程度 由所述第一接入点在第一设定时间内用于处理业务的时间比例所确定。 其 中， 退避时间为第一基本服务集内的节点设备从检测到第一接入点空闲时发 送的接入请求， 与第一基本服务集内的其他节点设备发送的接入请求发生碰 撞后， 再次发送接入请求所间隔的时间。
举例而言， 假设第一基本服务集内包括第一接入点、 节点设备 1、 节点 设备 2、 节点设备 3和节点设备 4， 节点设备 4处于重叠区域， 第二基本服务集 内包括第二接入点，第二接入点侦听到第一接入点的饱和接入程度小于第一 阈值。 则第二接入点暂停侦听第一信标帧， 并指示第一接入点降低节点设备 4的退避时间。 gp : 降低节点设备 4从检测到第一接入点空闲时向第一接入点 发送的接入请求， 节点设备 4向第一接入点发送的接入请求与节点设备 1、 节 点设备 2和节点设备 3向第一接入点发送的接入请求发生碰撞后， 节点设备 4 再次向第一接入点发送接入请求所间隔的时间。
具体地，在第二接入点侦听到第一接入点的饱和接入程度小于第一阈值 时， 第二接入点的有效侦听收缩效率低， 受第一基本服务集扩大广播第一信 标帧的影响也大； 在第二接入点侦听到第一接入点的饱和接入程度高于或等 于第一阈值时， 第二接入点的有效侦听收缩效率高， 受第一基本服务集扩大 广播第一信标帧的影响小。 因此， 在第二接入点侦听到第一接入点的饱和接 入程度高于或等于第一阈值或重叠区域中的节点设备较多的情况下，切换到 本发明实施例一中描述的功率调整方法；在第二接入点侦听到第一接入点的 饱和接入程度小于第一阈值或重叠区域中的节点设备较少时，停止实施例一 中描述的功率调整方法，第二接入点可以指示第一接入点减少处于重叠区域 的第一节点设备的退避时间，进而提高处于重叠区域的第一节点设备的优先 级， 以改善处于重叠区域的第一节点设备接入第一接入点的几率。
进一步地，第二接入点可以指示第一接入点调整处于重叠区域的第一节 点设备的退避时间， 使处于重叠区域的第一节点设备的退避时间小于第一基 本服务集中其它节点设备的退避时间，或使处于重叠区域的第一节点设备的 退避时间小于第一基本服务集中的所有节点设备的退避时间平均值。第一接 入点前一次数据传输结束， 若重叠区域没被第二基本服务集覆盖， 则处于重 叠区域的第一节点设备有机会竞争接入第一接入点的接入几率增大； 相应 地， 若重叠区域被第二基本服务集覆盖， 则处于重叠区域的第一节点设备没 有机会竞争接入第一接入点，第一基本服务集内处于非重叠区域的节点设备 等待机会竞争接入第一接入点。
在一种可能的实现方式中，所述功率调整方法还可以包括： 如果所述第 二基本服务集存在处于所述重叠区域内的第三节点设备需要提高接入所述 第二接入点的几率，所述第二接入点扩大自身发送第二信标帧的广播范围以 便于所述第一接入点侦听所述第二接入点发送的第二信标帧，以使得所述第 一接入点根据所述第二接入点发送的第二信标帧，进入自身的侦听期侦听所 述第三节点设备发送的第二信标帧，以确定所述第一节点设备与所述第一接 入点之间的数据传输功率的上限； 其中， 所述第二信标帧为采用所述
RTS/CTS协议格式的帧。
具体地， 当第一基本服务集和第二基本服务集中都有节点设备处于重叠 区域时， 第一基本服务集和第二基本服务集需要互相侦听。 如果第一基本服 务集有较多节点设备处于重叠区域同时第二基本服务集有较少节点设备处 于重叠区域， 则第二基本服务集的侦听功率控制可以按照上述实施例一步骤 S110和步骤 S130描述的功率调整方法进行功率控制， 或按照本实施例步骤 S210和图 2a、 图 2b描述的功率调整方法进行功率控制。 但是因为第二基本服 务集也有少量节点设备处于重叠区域，除了按照步骤 S110和步骤 S130描述的 功率调整方法进行功率控制， 或按照步骤 S210和图 2a、 图 2b描述的功率调整 方法进行功率控制以外，第二接入点还需要扩大自身发送第二信标帧的广播 范围， 以使第一接入点方便的侦听第二接入点发送的第二信标帧， 以使得第 一接入点根据第二接入点发送的第二信标帧， 确定自身侦听期开始的时刻。
第一接入点进入自身的侦听期侦听第二信标帧，若第一接入点在自身的 侦听期内侦听到第二信标帧， 则第一接入点根据侦听到的第二信标帧中的数 据字段， 判断第二信标帧是否来自第三节点设备。在第二信标帧来自第三节 点设备的情况下， 第一接入点根据第二信标帧中的接收信号强度指示 RSSI, 判断第三节点设备是否处于重叠区域。在第三节点设备处于重叠区域的情况 下， 第一接入点根据 RSSI, 确定第一节点设备与第一接入点之间的数据传输 功率的上限。
进一步地， 如果第一接入点在自身的侦听期内侦听到第二信标帧， 第一 接入点可以根据第二信标帧中的持续时间字段的网络分配矢量 NAV,确定自 身的下一个侦听期开始的时刻。
进一步地， 如果第一接入点在前一个侦听期内未侦听到第二信标帧， 则 第一接入点经过设定时间之后，启动对第二信标帧的长侦听， 并且向第一基 本服务集内的各个节点设备广播长侦听开始启动，以指示第一基本服务集内 的各个节点设备在长侦听的时间范围内暂停请求接入第一接入点。
进一步地，在第一接入点侦听到第二接入点的饱和接入程度小于第二阈 值的情况下， 第一接入点可以停止侦听第二信标帧， 指示第二接入点减少处 于重叠区域的第二基本服务集内的节点设备的退避时间。
举例而言， 图 2c为第一基本服务集和第二基本服务集互相侦听的示意 图， 如图 2c所示， 第二接入点侦听第一信标帧之后， 向第二基本服务集广播 剩余时长， 第一接入点进行侦听第二信标帧， SP : 第一接入点每次竞争接入 后， 先侦听第二基本服务集的反馈信息再进行数据传输， 反馈信息为第二信 标帧。 并且， 第一接入点在传输期知道何时暂停对第二基本服务集接入情况 侦听而做出功率调整。对于第一基本服务集和第二基本服务集都存在较多节 点设备处于重叠区域的恶劣情况， 建议扩大第一基本服务集和第二基本服务 集之间的距离， 减小第一基本服务集和第二基本服务集之间的重叠区域面 积。
本发明实施例的功率调整方法， 若侦听到第一节点设备处于重叠区域， 根据 RSSI确定第二节点设备与第二接入点之间的数据传输功率，相应调整第 二节点设备的数据传输功率，第二基本服务集可以不干扰处于重叠区域的第 一节点设备接入第一接入点和数据的传输， 提高了第一基本服务集和第二基 本服务集的并发传输概率。若侦听到第一接入点的饱和接入程度小于第一阈 值， 指示第一接入点减少处于重叠区域的第一节点设备的退避时间， 可以改 善处于重叠区域的第一节点设备接入第一接入点的几率。若第二基本服务集 同时存在处于重叠区域内的节点设备需要提高接入第二接入点的几率，扩大 第二信标帧的广播范围， 第一基本服务集和第二基本服务集互相侦听， 可以 更准确的调整第二节点设备的数据传输功率，提高第一基本服务集和第二基 本服务集的并发传输概率。
实施例 3
图 3为根据本发明实施例三的功率调整装置的结构框图。 本实施例的功 率调整装置 300用于实现图 la所示的实施例一的功率调整方法。 如图 3所示， 该功率调整装置 300主要包括侦听模块 320、 处理模块 310和确定模块 330。
所述侦听模块 320用于在侦听期内侦听第一信标帧。
所述处理模块 310与所述侦听模块 320连接， 用于如果所述侦听模块 320 在所述侦听期内侦听到所述第一信标帧， 则根据所述第一信标帧中的接收信 号强度指示 RSSI和数据字段，判断第一节点设备是否处于第一基本服务集和 所述第二基本服务集之间的重叠区域，所述第一节点设备为所述第一基本服 务集内接入第一接入点的节点设备。
功率调整装置 300可以为接入点（AP), 例如基站。单频组网中可以包括 多个基本服务集 (BSS), 每个 BSS可以包括一个 AP, 以及接入该 AP的多个节 点设备例如手机、 平板电脑、 车载移动装置等， 节点设备可以在侦听到载波 空闲时向 AP发送信标帧以请求接入 AP进行数据传输， 同一时刻只有一个节 点设备能够接入 AP进行数据传输。第一基本服务集包括第一接入点，第一基 本服务集内的接入第一接入点的节点设备为第一节点设备，第二基本服务集 包括功率调整装置 300和接入功率调整装置 300的多个节点设备，第一基本服 务集和第二基本服务集之间存在重叠区域。具体示例可以参见上述实施例一 中步骤 S110中的相关描述。
具体地， 第二基本服务集可以包括侦听期、 传输期和竞争接入期。 功率 调整装置 300与第二基本服务集中的节点设备进行数据传输的时段为传输 期。第二基本服务集中的节点设备在检测到功率调整装置 300空闲的情况下， 向功率调整装置 300请求接入的时段为竞争接入期。功率调整装置 300暂停数 据传输并侦听第一基本服务集广播的第一信标帧的时段为侦听期，一般情况 下， 侦听期处于传输期中。 侦听模块 320侦听到第一基本服务集准备广播第 一信标帧时， 功率调整装置 300可以触发自身的侦听期， 暂停当前正在进行 的数据传输， 侦听模块 320开始侦听第一基本服务集广播的第一信标帧。
在一种可能的实现方式中， 所述第一信标帧为采用请求发送 /允许发送 RTS/CTS协议格式的帧， 所述处理模块 310具体用于：
根据所述数据字段， 判断所述第一信标帧是否来自所述第一节点设备； 在所述第一信标帧来自所述第一节点设备的情况下， 根据所述 RSSI, 判断所述第一节点设备是否处于所述重叠区域。 具体地， 不仅第一基本服务集中的第一接入点能够广播第一信标帧， 而 且， 第一基本服务集中的第一节点设备也能够广播第一信标帧。 该第一信标 帧为采用请求发送 /允许发送 RTS/CTS协议格式的帧，该第一信标帧中包括数 据字段和接收信号强度指示 RSSI,数据字段可以标识第一信标帧是来自于第 一接入点还是来自于第一节点设备， RSSI可以表示接收的信号强度。 因此， 处理模块 310可以根据数据字段， 判断广播第一信标帧的是否是第一节点设 备。 若处理模块 310判定第一信标帧是第一节点设备广播的， 处理模块 310可 以根据 RSSI判断第一节点设备与功率调整装置 300的距离。 RSSI越强， 第一 节点设备距离功率调整装置 300越近； RSSI越低， 第一节点设备距离功率调 整装置 300越远。若 RSSI高于或等于设定阈值， 则处理模块 310可以判定第一 节点设备处于重叠区域。
举例而言， 参见图 lb， 假设节点设备 4广播了第一信标帧， 该第一信标 帧中的数据字段为 "2"， RSSI为 "50"， 设定阈值为 "44"。 若 AP2的侦听模 块 320侦听到第一信标帧且数据字段为 "2"， 则处理模块 310可以判定第一信 标帧来自于节点设备 4。 处理模块 310可以检测第一信标帧且 RSSI为 "50"大 于 "44"， 则处理模块 310可以判定节点设备 4处于 BSS1和 BSS2的重叠区域。 与实际相符。
所述确定模块 330与所述处理模块 310连接， 用于在所述处理模块 310判 定所述第一节点设备处于所述重叠区域的情况下， 根据所述 RSSI, 确定第二 节点设备与所述功率调整装置 300之间的数据传输功率的上限， 所述第二节 点设备为所述第二基本服务集内接入所述功率调整装置 300的节点设备。
具体地， 侦听模块 320每次侦听第一信标帧之后， 处理模块 310可以判断 侦听期暂停的数据传输是上行还是下行。 其中， 上行是指第二节点设备向功 率调整装置 300发送数据， 下行是指功率调整装置 300向第二节点设备发送数 据。 确定模块 330根据侦听模块 320在侦听期内侦听的情况， 确定侦听期暂停 的数据传输的数据传输功率， 包括以下两种情况：
情况一、 侦听期暂停的数据传输是下行， 确定模块 330可以根据侦听情 况选择数据传输功率。
具体地， 在处理模块 310判定第一节点设备处于重叠区域的情况下， 则 确定模块 330可以降低侦听期暂停的数据传输的数据传输功率， 数据传输功 率降低到恰好不干扰第一基本服务集中处于重叠区域的节点设备接入第一 接入点和数据的传输即可。 若数据传输功率降低太少， 干扰了第一基本服务 集中处于重叠区域的节点设备接入第一接入点和数据的传输； 若数据传输功 率降低太多， 虽然不干扰第一基本服务集中处于重叠区域的节点设备接入第 一接入点和数据的传输， 但是第二基本服务集的数据传输功率下降太多， 数 据传输速率也相应降低太多， 降低了第一基本服务集和第二基本服务集的并 发传输概率。 其中， 并发传输概率是指第一基本服务集和第二基本服务集同 时进行数据传输的概率。因此，对比于通常的盲目调整数据传输功率的方法， 本发明实施例的功率调整装置 300调整数据传输功率是均衡了不干扰第一基 本服务集中处于重叠区域的节点设备和并发传输概率， 以恰好不干扰第一基 本服务集中处于重叠区域的节点设备接入第一接入点和数据的传输为基准， 即在不干扰第一基本服务集中处于重叠区域的节点设备接入第一接入点和 数据的传输的前提下，尽可能的使数据传输功率高。相应地，在处理模块 310 判定第一节点设备处于非重叠区域的情况下， 则确定模块 330可以不调整侦 听期暂停的数据传输的数据传输功率， 或者确定模块 330可以在不干扰第一 基本服务集的情况下， 适当地增大侦听期暂停的数据传输的数据传输功率。
情况二、 侦听期暂停的数据传输是上行， 第二节点设备可以根据侦听情 况选择数据传输功率。
具体地， 在侦听期结束之后， 处理模块 310可以在第二基本服务集中广 播侦听到的情况和侦听期暂停的数据传输的传输期剩余时长， 以把侦听到的 情况反馈给第二节点设备。 第二节点设备可以根据侦听模块 320在侦听期内 侦听到的情况和侦听期暂停的数据传输的传输期剩余时长，及时地调整自身 的数据传输功率。在处理模块 310判定第一节点设备处于重叠区域的情况下， 则第二节点设备可以降低自身的数据传输功率，数据传输功率降低到恰好不 干扰第一基本服务集中处于重叠区域的节点设备接入第一接入点和数据的 传输即可。 若数据传输功率降低太少， 干扰了第一基本服务集中处于重叠区 域的节点设备； 若数据传输功率降低太多， 虽然不干扰第一基本服务集中处 于重叠区域的节点设备， 但是第二节点设备的数据传输功率降低太多， 第二 基本服务集的数据传输功率降低太多，第二基本服务集的数据传输速率也相 应降低太多， 降低了第一基本服务集和第二基本服务集的并发传输概率。 对 比于通常的盲目调整数据传输功率的方法， 本发明实施例的第二节点设备调 整自身的数据传输功率是均衡了不干扰第一基本服务集中处于重叠区域的 节点设备和并发传输概率， 以恰好不干扰第一基本服务集中处于重叠区域的 节点设备为基准， 即在不干扰第一基本服务集中处于重叠区域的节点设备接 入第一接入点和数据的传输的前提下，尽可能的使第二节点设备的数据传输 功率高。 在处理模块 310判定第一节点设备处于非重叠区域的情况下， 则第 二节点设备可以不调整自身的数据传输功率， 或者第二节点设备可以在不干 扰第一基本服务集的情况下， 适当地增大自身的数据传输功率。
进一步地， 确定模块 330确定了第二节点设备与功率调整装置 300之间的 数据传输功率之后， 还可以确定第二节点设备与功率调整装置 300之间的数 据传输速率。 具体示例可以参见上述实施例一中步骤 S130中的相关描述。
在一种可能的实现方式中， 所述确定模块 330与所述侦听模块 320连接， 用于根据所述第一信标帧中的持续时间字段的网络分配矢量 NAV，确定下一 个侦听期开始的时刻。
具体地， 该第一信标帧中还包括持续时间字段， 持续时间字段中包括网 络分配矢量。 确定模块 330可以根据 NAV计算需要等待的时间， gp : 可以确 定下一次接收第一信标帧的时间， 也就是确定侦听模块 320进行下一个侦听 的侦听期开始的时刻， 从而不断侦听第一信标帧。 功率调整装置 300在确定 模块 330在侦听期接收 NAV确定下一个侦听期的开始时刻之后， 可以在第二 基本服务集中广播下一个侦听期开始的时刻，从而第二基本服务集中的所有 节点设备可以在下一个侦听期进行回避不干扰功率调整装置 300侦听第一信 标帧， 即使下一个侦听期出现在非数据传输期也能保证侦听模块 320有效侦 听第一基本服务集的第一信标帧。
本发明实施例的功率调整装置， 处理模块根据侦听模块侦听的第一信标 帧中的数据字段和 RSSI,判断第一节点设备是否处于第一基本服务集和第二 基本服务集之间的重叠区域， 若第一节点设备处于重叠区域， 确定模块根据 RSSI确定第二节点设备与功率调整装置之间的数据传输功率，相应调整第二 节点设备的数据传输功率， 从而第二基本服务集可以不干扰处于重叠区域中 的第一节点设备接入第一接入点和数据的传输，提高了第一基本服务集和第 二基本服务集的并发传输概率。
实施例 4
图 4为根据本发明实施例四的功率调整装置的结构框图。 本实施例的功 率调整装置 400用于实现图 2a所示的实施例二的功率调整方法。 图 4中标号与 图 3相同的组件具有相同的功能， 为简明起见， 省略对这些组件的详细说明。
如图 4所示， 图 4所示的功率调整装置 400与图 3所示的功率调整装置 300 的主要区别在于，所述处理模块 410还用于如果所述侦听模块 420在前一个侦 听期内未侦听到所述第一信标帧， 经过设定时间之后， 启动对所述第一信标 帧的长侦听， 并且向所述第二基本服务集内的各个节点设备广播所述长侦听 开始启动， 以指示所述第二基本服务集内的各个节点设备在所述长侦听的时 间范围内暂停请求接入所述第二基本服务集的功率调整装置 400。 具体地， 功率调整装置 400在侦听期可以暂停数据传输以使侦听模块 420 可以侦听第一基本服务集广播的第一信标帧。 如果侦听模块 420在前一个侦 听期没有侦听到第一基本服务集广播的第一信标帧， 从而处理模块 410无法 确定何时进入下一侦听期， 这种情况下， 处理模块 410可以间隔预先设定的 T 时间后， 启动长侦听去主动侦听第一基本服务集广播的第一信标帧， 之后再 次进入传输期以及侦听期， 如此循环不断执行。 具体示例可以参见上述实施 例二中步骤 S210中的相关描述。
在一种可能的实现方式中，所述处理模块 410还用于在所述侦听模块 420 侦听到所述第一接入点的饱和接入程度小于第一阈值的情况下，停止侦听所 述第一信标帧，指示所述第一接入点减少处于所述重叠区域的所述第一基本 服务集内的节点设备的退避时间，所述饱和接入程度由所述第一接入点在第 一设定时间内用于处理业务的时间比例所确定。其中， 退避时间为第一基本 服务集内的节点设备从检测到第一接入点空闲时发送的接入请求，与第一基 本服务集内的其他节点设备发送的接入请求发生碰撞后，再次发送接入请求 所间隔的时间。 具体示例可以参见上述实施例二中步骤 S210中的相关描述。
具体地， 在侦听模块 420侦听到第一接入点的饱和接入程度小于第一阈 值时， 侦听模块 420的有效侦听收缩效率低， 受第一基本服务集扩大广播第 一信标帧的影响也大； 在侦听模块 420侦听到第一接入点的饱和接入程度高 于或等于第一阈值时， 侦听模块 420的有效侦听收缩效率高， 受第一基本服 务集扩大广播第一信标帧的影响小。 因此， 在侦听模块 420侦听到第一接入 点的饱和接入程度高于或等于第一阈值或重叠区域中的节点设备较多的情 况下， 切换到本发明实施例一中描述的功率调整方法； 在侦听模块 420侦听 到第一接入点的饱和接入程度小于第一阈值或重叠区域中的节点设备较少 时， 停止实施例一中描述的功率调整方法， 处理模块 410可以指示第一接入 点减少第一节点设备的退避时间， 进而提高第一节点设备的优先级， 以改善 第一节点设备接入第一接入点的几率。
进一步地， 处理模块 410可以指示第一接入点调整第一节点设备的退避 时间， 使第一节点设备的退避时间小于第一基本服务集中其它节点设备的退 避时间，或使第一节点设备的退避时间小于第一基本服务集中的所有节点设 备的退避时间平均值。 第一接入点前一次数据传输结束， 若重叠区域没被第 二基本服务集覆盖， 则第一节点设备有机会竞争接入第一接入点的接入几率 增大； 相应地， 若重叠区域被第二基本服务集覆盖， 则第一节点设备没有机 会竞争接入第一接入点，第一基本服务集内处于非重叠区域的节点设备等待 机会竞争接入第一接入点。
在一种可能的实现方式中， 所述处理模块 410还用于如果所述第二基本 服务集存在处于所述重叠区域内的第三节点设备需要提高接入所述第二基 本服务集的功率调整装置 400的几率， 扩大发送第二信标帧的广播范围以便 于所述第一接入点侦听所述第二基本服务集的功率调整装置 400发送的第二 信标帧， 以使得所述第一接入点根据所述第二基本服务集的功率调整装置 400发送的第二信标帧， 进入自身的侦听期侦听所述第三节点设备发送的第 二信标帧，以确定所述第一节点设备与所述第一接入点之间的数据传输功率 的上限； 其中， 所述第二信标帧为采用所述 RTS/CTS协议格式的帧。
具体地， 当第一基本服务集和第二基本服务集中都有节点设备处于重叠 区域时， 第一基本服务集和第二基本服务集需要互相侦听。 如果第一基本服 务集有较多节点设备处于重叠区域同时第二基本服务集有较少节点设备处 于重叠区域， 则第二基本服务集的侦听功率控制可以按照上述实施例一步骤 S110和步骤 S130描述的功率调整方法进行功率控制， 或按照本实施例步骤 S210和图 2a、 图 2b描述的功率调整方法进行功率控制。 但是因为第二基本服 务集也有少量节点设备处于重叠区域，除了按照步骤 S110和步骤 S130描述的 功率调整方法进行功率控制， 或按照步骤 S210和图 2a、 图 2b描述的功率调整 方法进行功率控制以外， 处理模块 410还需要扩大自身发送第二信标帧的广 播范围， 以使第一接入点方便的侦听功率调整装置 400发送的第二信标帧， 并根据功率调整装置 400发送的第二信标帧， 确定自身侦听期开始的时刻。
第一接入点进入自身的侦听期侦听第二信标帧，若第一接入点在自身的 侦听期内侦听到第二信标帧， 则第一接入点根据侦听到的第二信标帧中的数 据字段， 判断第二信标帧是否来自第三节点设备。在第二信标帧来自第三节 点设备的情况下， 第一接入点根据第二信标帧中的接收信号强度指示 RSSI, 判断第三节点设备是否处于重叠区域。在第三节点设备处于重叠区域的情况 下， 第一接入点根据 RSSI, 确定第一节点设备与第一接入点之间的数据传输 功率的上限。
进一步地， 如果第一接入点在自身的侦听期内侦听到第二信标帧， 第一 接入点可以根据第二信标帧中的持续时间字段的网络分配矢量 NAV,确定自 身的下一个侦听期开始的时刻。
进一步地， 如果第一接入点在前一个侦听期内未侦听到第二信标帧， 则 第一接入点经过设定时间之后，启动对第二信标帧的长侦听， 并且向第一基 本服务集内的各个节点设备广播长侦听开始启动，以指示第一基本服务集内 的各个节点设备在长侦听的时间范围内暂停请求接入第一接入点。
进一步地， 在第一接入点侦听到功率调整装置 400的饱和接入程度小于 第二阈值的情况下， 第一接入点可以停止侦听第二信标帧， 指示功率调整装 置 400减少处于重叠区域的第二基本服务集内的节点设备的退避时间。
具体示例可以参见上述实施例二中步骤 S210中的相关描述。对于第一基 本服务集和第二基本服务集都存在较多节点设备处于重叠区域的恶劣情况， 建议扩大第一基本服务集和第二基本服务集之间的距离，减小第一基本服务 集和第二基本服务集之间的重叠区域面积。
本发明实施例的功率调整装置，若侦听模块侦听到第一节点设备处于重 叠区域，确定模块根据 RSSI确定第二节点设备与功率调整装置之间的数据传 输功率， 相应调整第二节点设备的数据传输功率， 第二基本服务集可以不干 扰处于重叠区域的第一节点设备接入第一接入点和数据的传输， 提高了第一 基本服务集和第二基本服务集的并发传输概率。若侦听模块侦听到第一接入 点的饱和接入程度小于第一阈值， 处理模块指示第一接入点减少处于重叠区 域的第一节点设备的退避时间，可以改善处于重叠区域的第一节点设备接入 第一接入点的几率。若第二基本服务集存在处于重叠区域内的节点设备需要 提高接入功率调整装置的几率， 处理模块扩大自身发送第二信标帧的广播范 围， 第一基本服务集和第二基本服务集互相侦听， 可以更准确的调整第二节 点设备的数据传输功率，提高第一基本服务集和第二基本服务集的并发传输 概率。
实施例 5
图 5为根据本发明实施例五的功率调整装置的结构框图。 所述功率调整 装置 500可以是具备计算能力的主机服务器、 个人计算机 PC、 或者可携带的 便携式计算机或终端等。本发明具体实施例并不对计算节点的具体实现做限 定。
所述功率调整装置 500包括处理器（processor)510、 通信接口 (Communications Interface)520、 存储器 (memory array)530禾口总线 540。 其中， 处理器 510、 通信接口 520、 以及存储器 530通过总线 540完成相互间的通信。
通信接口 520用于与网元通信， 其中网元包括例如虚拟机管理中心、 共 享存储等。
处理器 510用于执行程序。 处理器 510可能是一个中央处理器 CPU, 或者 是专用集成电路 （Application Specific Integrated Circuit, ASIC) , 或者是被 配置成实施本发明实施例的一个或多个集成电路。
存储器 530用于存放文件。存储器 530可能包含高速 RAM存储器，也可能 还包括非易失性存储器 (non- volatile memory), 例如至少一个磁盘存储器。存 储器 530也可以是存储器阵列。存储器 530还可能被分块， 并且所述块可按一 定的规则组合成虚拟卷。
在一种可能的实现方式中， 上述程序可为包括计算机操作指令的程序代 码。 该程序具体可用于：
如果第二基本服务集的第二接入点在侦听期内侦听到第一信标帧，则所 述第二接入点根据所述第一信标帧中的接收信号强度指示 RSSI和数据字 段，判断第一节点设备是否处于第一基本服务集和所述第二基本服务集之间 的重叠区域，所述第一节点设备为所述第一基本服务集内接入第一接入点的 节点设备；
在所述第一节点设备处于所述重叠区域的情况下，所述第二接入点根据 所述 RSSI, 确定第二节点设备与所述第二接入点之间的数据传输功率的上 限，所述第二节点设备为所述第二基本服务集内接入所述第二接入点的节点 设备。
在一种可能的实现方式中， 所述第一信标帧为采用请求发送 /允许发送 RTS/CTS协议格式的帧，所述第二接入点根据所述第一信标帧中的接收信号 强度指示 RSSI和数据字段， 判断第一节点设备是否处于第一基本服务集和 所述第二基本服务集之间的重叠区域， 包括：
所述第二接入点根据所述数据字段，判断所述第一信标帧是否来自所述 第一节点设备；
在所述第一信标帧来自所述第一节点设备的情况下，所述第二接入点根 据所述 RSSI, 判断所述第一节点设备是否处于所述重叠区域。
在一种可能的实现方式中，所述如果第二基本服务集的第二接入点在侦 听期内侦听到第一信标帧之后， 所述方法还包括：
所述第二接入点根据所述第一信标帧中的持续时间字段的网络分配矢 量 NAV， 确定下一个侦听期开始的时刻。
在一种可能的实现方式中，如果所述第二接入点在前一个侦听期内未侦 听到所述第一信标帧， 所述方法还包括：
经过设定时间之后， 所述第二接入点启动对所述第一信标帧的长侦听， 并且向所述第二基本服务集内的各个节点设备广播所述长侦听开始启动， 以 指示所述第二基本服务集内的各个节点设备在所述长侦听的时间范围内暂 停请求接入所述第二接入点。
在一种可能的实现方式中， 还包括：
在所述第二接入点侦听到所述第一接入点的饱和接入程度小于第一阈 值的情况下， 所述第二接入点停止侦听所述第一信标帧， 指示所述第一接入 点减少处于所述重叠区域的所述第一基本服务集内的节点设备的退避时间， 所述饱和接入程度由所述第一接入点在第一设定时间内用于处理业务的时 间比例所确定。
在一种可能的实现方式中， 还包括：
如果所述第二基本服务集存在处于所述重叠区域内的第三节点设备需 要提高接入所述第二接入点的几率，所述第二接入点扩大自身发送第二信标 帧的广播范围以便于所述第一接入点侦听所述第二接入点发送的第二信标 帧， 以使得所述第一接入点根据所述第二接入点发送的第二信标帧，进入自 身的侦听期侦听所述第三节点设备发送的第二信标帧，以确定所述第一节点 设备与所述第一接入点之间的数据传输功率的上限；
其中， 所述第二信标帧为采用所述 RTS/CTS协议格式的帧。
本发明实施例的功率调整装置， 根据第一信标帧中的数据字段和 RSSI, 判断第一节点设备是否处于第一基本服务集和第二基本服务集之间的重叠 区域， 若第一节点设备处于重叠区域， 根据 RSSI确定第二节点设备与功率调 整装置之间的数据传输功率， 相应调整第二节点设备的数据传输功率， 从而 第二基本服务集可以不干扰处于重叠区域的第一节点设备接入第一接入点 和数据的传输， 提高了第一基本服务集和第二基本服务集的并发传输概率。
本领域普通技术人员可以意识到， 本文所描述的实施例中的各示例性单 元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。 这些功能究竟以硬件还是软件形式来实现， 取决于技术方案的特点应用和设 计约束条件。专业技术人员可以针对特定的应用选择不同的方法来实现所描 述的功能， 但是这种实现不应认为超出本发明的范围。
如果以计算机软件的形式来实现所述功能并作为独立的产品销售或使 用时， 则在一定程度上可以认为本发明的技术方案的全部或部分（例如对现 有技术做出贡献的部分）是以计算机软件产品的形式体现的。 该计算机软件 产品通常存储在计算机可读取的存储介质中，包括若干指令用以使得计算机 设备（可以是个人计算机、 服务器、 或者网络设备等）执行本发明各实施例 方法的全部或部分步骤。 而前述的存储介质包括 U盘、 移动硬盘、 只读存储 器（英文： Read-Only Memory,缩写： ROM)、随机存取存储器（英文： Random Access Memory, 缩写： RAM)、 磁碟或者光盘等各种可以存储程序代码的 介质。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到变化或替代， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护 范围应所述以权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种功率调整装置， 其特征在于， 包括：
侦听模块， 用于在侦听期内侦听第一信标帧；
处理模块， 与所述侦听模块连接，用于如果所述侦听模块在所述侦听期 内侦听到所述第一信标帧， 则根据所述第一信标帧中的接收信号强度指示
RSSI和数据字段， 判断第一节点设备是否处于第一基本服务集和所述第二 基本服务集之间的重叠区域，所述第一节点设备为所述第一基本服务集内接 入第一接入点的节点设备；
确定模块， 与所述处理模块连接，用于在所述处理模块判定所述第一节 点设备处于所述重叠区域的情况下， 根据所述 RSSI, 确定第二节点设备与 所述功率调整装置之间的数据传输功率的上限，所述第二节点设备为所述第 二基本服务集内接入所述功率调整装置的节点设备。
2、 根据权利要求 1所述的功率调整装置， 其特征在于， 所述第一信标帧 为采用请求发送 /允许发送 RTS/CTS协议格式的帧， 所述处理模块具体用于： 根据所述数据字段， 判断所述第一信标帧是否来自所述第一节点设备； 在所述第一信标帧来自所述第一节点设备的情况下， 根据所述 RSSI, 判断所述第一节点设备是否处于所述重叠区域。
3、 根据权利要求 1或 2所述的功率调整装置， 其特征在于， 所述确定模 块与所述侦听模块连接，用于根据所述第一信标帧中的持续时间字段的网络 分配矢量 NAV, 确定下一个侦听期开始的时刻。
4、 根据权利要求 3所述的功率调整装置， 其特征在于， 所述处理模块还 用于如果所述侦听模块在前一个侦听期内未侦听到所述第一信标帧，经过设 定时间之后， 启动对所述第一信标帧的长侦听， 并且向所述第二基本服务集 内的各个节点设备广播所述长侦听开始启动，以指示所述第二基本服务集内 的各个节点设备在所述长侦听的时间范围内暂停请求接入所述第二基本服 务集的功率调整装置。
5、 根据权利要求 1-4中任一项所述的功率调整装置， 其特征在于， 所述 处理模块还用于，在所述侦听模块侦听到所述第一接入点的饱和接入程度小 于第一阈值的情况下， 停止侦听所述第一信标帧，指示所述第一接入点减少 处于所述重叠区域的所述第一基本服务集内的节点设备的退避时间，所述饱 和接入程度由所述第一接入点在第一设定时间内用于处理业务的时间比例 所确定。
6、 根据权利要求 1-5中任一项所述的功率调整装置， 其特征在于， 所述 处理模块还用于，如果所述第二基本服务集存在处于所述重叠区域内的第三 节点设备需要提高接入所述第二基本服务集的功率调整装置的几率，扩大发 送第二信标帧的广播范围以便于所述第一接入点侦听所述第二基本服务集 的功率调整装置发送的第二信标帧，以使得所述第一接入点根据所述第二基 本服务集的功率调整装置发送的第二信标帧，进入自身的侦听期侦听所述第 三节点设备发送的第二信标帧，以确定所述第一节点设备与所述第一接入点 之间的数据传输功率的上限；
其中， 所述第二信标帧为采用所述 RTS/CTS协议格式的帧。
7、 一种功率调整方法， 其特征在于， 包括：
如果第二基本服务集的第二接入点在侦听期内侦听到第一信标帧，则所 述第二接入点根据所述第一信标帧中的接收信号强度指示 RSSI和数据字 段，判断第一节点设备是否处于第一基本服务集和所述第二基本服务集之间 的重叠区域，所述第一节点设备为所述第一基本服务集内接入第一接入点的 节点设备；
在所述第一节点设备处于所述重叠区域的情况下，所述第二接入点根据 所述 RSSI, 确定第二节点设备与所述第二接入点之间的数据传输功率的上 限，所述第二节点设备为所述第二基本服务集内接入所述第二接入点的节点 设备。
8、 根据权利要求 7所述的功率调整方法， 其特征在于， 所述第一信标帧 为采用请求发送 /允许发送 RTS/CTS协议格式的帧， 所述第二接入点根据所 述第一信标帧中的接收信号强度指示 RSSI和数据字段， 判断第一节点设备 是否处于第一基本服务集和所述第二基本服务集之间的重叠区域， 包括： 所述第二接入点根据所述数据字段，判断所述第一信标帧是否来自所述 第一节点设备；
在所述第一信标帧来自所述第一节点设备的情况下，所述第二接入点根 据所述 RSSI, 判断所述第一节点设备是否处于所述重叠区域。
9、 根据权利要求 7或 8所述的功率调整方法， 其特征在于， 所述如果第 二基本服务集的第二接入点在侦听期内侦听到第一信标帧之后，所述方法还 包括：
所述第二接入点根据所述第一信标帧中的持续时间字段的网络分配矢 量 NAV, 确定下一个侦听期开始的时刻。
10、 根据权利要求 9所述的功率调整方法， 其特征在于， 如果所述第二 接入点在前一个侦听期内未侦听到所述第一信标帧， 所述方法还包括： 经过设定时间之后， 所述第二接入点启动对所述第一信标帧的长侦听， 并且向所述第二基本服务集内的各个节点设备广播所述长侦听开始启动，以 指示所述第二基本服务集内的各个节点设备在所述长侦听的时间范围内暂 停请求接入所述第二接入点。
11、 根据权利要求 7-10中任一项所述的功率调整方法， 其特征在于， 还 包括：
在所述第二接入点侦听到所述第一接入点的饱和接入程度小于第一阈 值的情况下，所述第二接入点停止侦听所述第一信标帧， 指示所述第一接入 点减少处于所述重叠区域的所述第一基本服务集内的节点设备的退避时间， 所述饱和接入程度由所述第一接入点在第一设定时间内用于处理业务的时 间比例所确定。
12、 根据权利要求 7-11中任一项所述的功率调整方法， 其特征在于， 还 包括：
如果所述第二基本服务集存在处于所述重叠区域内的第三节点设备需 要提高接入所述第二接入点的几率，所述第二接入点扩大自身发送第二信标 帧的广播范围以便于所述第一接入点侦听所述第二接入点发送的第二信标 帧， 以使得所述第一接入点根据所述第二接入点发送的第二信标帧，进入自 身的侦听期侦听所述第三节点设备发送的第二信标帧，以确定所述第一节点 设备与所述第一接入点之间的数据传输功率的上限；
其中， 所述第二信标帧为采用所述 RTS/CTS协议格式的帧。
PCT/CN2013/087255 2013-11-15 2013-11-15 功率调整方法及装置 WO2015070443A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2013/087255 WO2015070443A1 (zh) 2013-11-15 2013-11-15 功率调整方法及装置
CN201380075801.8A CN105144796B (zh) 2013-11-15 2013-11-15 功率调整方法及装置
EP13897554.5A EP3070980B1 (en) 2013-11-15 2013-11-15 Power adjustment method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/087255 WO2015070443A1 (zh) 2013-11-15 2013-11-15 功率调整方法及装置

Publications (1)

Publication Number Publication Date
WO2015070443A1 true WO2015070443A1 (zh) 2015-05-21

Family

ID=53056659

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2013/087255 WO2015070443A1 (zh) 2013-11-15 2013-11-15 功率调整方法及装置

Country Status (3)

Country Link
EP (1) EP3070980B1 (zh)
CN (1) CN105144796B (zh)
WO (1) WO2015070443A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110115068A (zh) * 2017-04-21 2019-08-09 深圳市大疆创新科技有限公司 无线通信系统的自适应发送功率控制

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018076487A1 (zh) * 2016-10-28 2018-05-03 华为技术有限公司 一种识别接收帧的基本服务集bss归属的方法和设备
CN109257810B (zh) 2017-07-12 2022-05-10 华为技术有限公司 一种功率控制方法和终端设备
CN111182621A (zh) * 2020-01-03 2020-05-19 烽火通信科技股份有限公司 一种动态调整ap发射功率方法及动态调整发射功率ap
CN114554584A (zh) * 2021-12-31 2022-05-27 锐捷网络股份有限公司 通信方法、系统、服务器及无线接入点
CN114513841B (zh) * 2022-04-18 2022-07-01 国网四川省电力公司电力科学研究院 一种电力应急通信系统的多ap协作功率控制方法和系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101124784A (zh) * 2004-12-20 2008-02-13 皇家飞利浦电子股份有限公司 用于减少无线电网络中网络用户的相互干扰的方法和装置
CN102754493A (zh) * 2010-02-12 2012-10-24 高通股份有限公司 基于接收的接入终端消息来控制接入点发射功率
CN103119870A (zh) * 2010-09-24 2013-05-22 高通股份有限公司 接入点发射功率控制

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020172186A1 (en) * 2001-04-09 2002-11-21 Peter Larsson Instantaneous joint transmit power control and link adaptation for RTS/CTS based channel access
KR101785712B1 (ko) * 2009-10-23 2017-10-17 한국전자통신연구원 무선랜 시스템에서 송신 출력 제어 방법 및 장치

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101124784A (zh) * 2004-12-20 2008-02-13 皇家飞利浦电子股份有限公司 用于减少无线电网络中网络用户的相互干扰的方法和装置
CN102754493A (zh) * 2010-02-12 2012-10-24 高通股份有限公司 基于接收的接入终端消息来控制接入点发射功率
CN103119870A (zh) * 2010-09-24 2013-05-22 高通股份有限公司 接入点发射功率控制

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110115068A (zh) * 2017-04-21 2019-08-09 深圳市大疆创新科技有限公司 无线通信系统的自适应发送功率控制
CN110115068B (zh) * 2017-04-21 2023-05-02 深圳市大疆创新科技有限公司 无线通信系统的自适应发送功率控制

Also Published As

Publication number Publication date
CN105144796B (zh) 2019-05-10
CN105144796A (zh) 2015-12-09
EP3070980A4 (en) 2016-11-16
EP3070980B1 (en) 2019-01-02
EP3070980A1 (en) 2016-09-21

Similar Documents

Publication Publication Date Title
CN107637157B (zh) 用于wlan中的子信道化传输方案的方法和设备
AU2013332687B2 (en) Method and apparatus for channel access in wireless LAN system
WO2015070443A1 (zh) 功率调整方法及装置
US9756659B2 (en) Method and apparatus for channel access via null data packet frame in wireless LAN system
US20210307072A1 (en) Wireless communication device, wireless communication method, and computer program
EP3397016B1 (en) Channel contention method and apparatus
WO2013147567A1 (ko) 무선랜 시스템에서 채널 액세스 제어 방법 및 장치
US10673547B1 (en) Method and apparatus for communication
JP6763016B2 (ja) 端末装置、基地局装置、および、通信方法
KR20180043265A (ko) 공간 재사용을 위한 백오프 메커니즘 기술들
EP2809110A1 (en) Method, access point, and station for data transmission
WO2013037327A1 (zh) 一种传输信息的方法和装置
WO2015088160A1 (ko) 전력 정보 기반 간섭 제어 신호 송수신 방법 및 이를 위한 장치
WO2018196092A1 (zh) 一种随机接入方法和装置
TW201640943A (zh) 於無線網路中減少碰撞之系統及方法
WO2015093792A1 (ko) 하향링크용 채널을 지원하는 무선랜 시스템에서 전력절감모드 동작 방법 및 이를 위한 장치
EP3965518A1 (en) Random access method and apparatus, and communication system
WO2015137662A1 (ko) 하향링크용 채널을 지원하는 무선랜 시스템에서 데이터 송수신 방법 및 이를 위한 장치
WO2019029695A1 (zh) 功率控制的方法及装置
EP4195857A1 (en) Channel access method for multi-link device, and related apparatus
WO2013026408A1 (zh) 随机接入方法和设备
WO2021062576A1 (zh) 随机接入方法、装置和通信系统
WO2016201693A1 (zh) 数据传输方法和装置
CN113228807B (zh) 数据发送方法、装置和通信系统
JP2019110351A (ja) 端末装置、基地局装置、通信方法、および、集積回路

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201380075801.8

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13897554

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2013897554

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2013897554

Country of ref document: EP