CN110972311B - Bandwidth selection method, device and storage medium based on WLAN - Google Patents

Bandwidth selection method, device and storage medium based on WLAN Download PDF

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CN110972311B
CN110972311B CN201911172974.7A CN201911172974A CN110972311B CN 110972311 B CN110972311 B CN 110972311B CN 201911172974 A CN201911172974 A CN 201911172974A CN 110972311 B CN110972311 B CN 110972311B
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transmission power
maximum
sta
available
wireless network
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CN110972311A (en
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李宛苡
吴昌强
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TP Link Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • 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

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

Abstract

The invention discloses a bandwidth selection method, a device, equipment and a storage medium based on WLAN, which monitor available candidate bandwidth sets of a wireless network; calculating the maximum available transmission power of the transmitting STA in the current channel according to the management frame transmitted by the AP of the wireless network and the maximum transmission power of the transmitting STA, which are received by the transmitting STA before joining the BSS of the wireless network; the management frame comprises power limit information, transmission power range information and maximum transmission power information of a current channel of the BSS; calculating the path loss between the transmitting STA and the receiving STA according to the TPC report frame returned by the receiving STA and received by the transmitting STA; the TPC report frame includes transmit power information of the TPC report frame; calculating an available bandwidth set of the wireless network according to maximum available transmission power, path loss of a transmitting STA and CCA thresholds under different bandwidths in the available candidate bandwidth set; the maximum available bandwidth is selected from a set of available bandwidths of the wireless network. The invention fully considers the data fed back by the receiving end, and saves the channel overhead and the energy consumption.

Description

Bandwidth selection method, device and storage medium based on WLAN
Technical Field
The present invention belongs to the technical field of wireless communication, and in particular, relates to a bandwidth selection method, device and storage medium based on WLAN.
Background
In a wireless communication system, the data transceiver often needs to select an optimal transmission rate to achieve maximum system throughput before communicating. Rate selection includes bandwidth selection, MCS selection, NSS selection, and G I selection. The bandwidth selection technique generally needs to monitor the idle channel state, uses a relatively high bandwidth to achieve the purpose of improving the data transmission rate, but also has a high quality requirement on the high bandwidth channel, and continuously uses the high bandwidth, so that a very critical factor, namely energy consumption (power control), needs to be considered.
Currently, the dominant bandwidth selection/allocation methods mentioned in each large chip manufacturer or paper/patent can be divided into two categories: the server is used for centralized distribution, and the distributed measurement standards are the flow requirements, the service types and the service priorities of the data sent by different current workstations; another class is that the workstation heuristically selects bandwidth, and changes bandwidth usage based on statistics (e.g., packet loss rate, etc.) of the data transmissions by the sender. However, the existing bandwidth selection technique only selects according to the data received by the transmitting end, and it is necessary for the data transmitting end to consume a lot of unnecessary channels and energy.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method, an apparatus, and a storage medium for selecting bandwidth based on WLAN, which fully consider data fed back by a receiving end, and save channel overhead and energy consumption.
In a first aspect, an embodiment of the present invention provides a method for selecting a bandwidth based on WLAN, including:
monitoring an available candidate bandwidth set of the wireless network;
calculating the maximum available transmission power of a transmitting STA in a current channel according to a management frame transmitted by an AP of the wireless network and received by the transmitting STA before joining a BSS of the wireless network and the maximum transmission power of the transmitting STA; wherein, the management frame contains the power limit information, the transmission power range information and the maximum transmission power information of the current channel of the BSS;
calculating the path loss between the sending STA and the receiving STA according to a TPC report frame returned by the receiving STA and received by the sending STA; wherein the TPC report frame is generated by the receiving STA in response to a TPC request frame transmitted by the transmitting STA; the TPC report frame includes transmit power information of the TPC report frame;
calculating an available bandwidth set of the wireless network according to the maximum available transmission power of the transmitting STA, the path loss and CCA thresholds under different bandwidths in the available candidate bandwidth set;
and selecting the maximum available bandwidth from the available bandwidth set of the wireless network.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
firstly, monitoring an available candidate bandwidth set of a wireless network, and then determining the maximum transmission power which can be used under a current channel and the path loss index of the current channel by aiming at a transmitting STA serving as a data transmitting end; combining with CCA thresholds under different bandwidths, screening out available bandwidths, and finally selecting the maximum available bandwidth based on the available bandwidths; meanwhile, by combining power control, channel overhead and energy consumption are saved, and the situation that a receiving end cannot normally receive signals is avoided.
As an improvement of the above solution, the monitoring the available candidate bandwidth set of the wireless network specifically includes:
and identifying the available candidate bandwidth set of the wireless network according to the idle state of the channel of the wireless network and the NAV value of the channel.
As an improvement of the above solution, the calculating the maximum available transmission power of the transmitting STA in the current channel according to the management frame transmitted by the AP of the wireless network and the maximum transmission power of the transmitting STA, which are received by the transmitting STA before joining the BSS of the wireless network, specifically includes:
calculating the maximum local transmission power of the current channel according to the power limit information and the maximum transmission power information in the management frame; wherein the power limitation information includes a local power limitation;
determining the maximum limit transmission power of the current channel according to the transmission power range information in the management frame;
and calculating the maximum available transmission power of the transmitting STA in the current channel according to the maximum local transmission power, the maximum limiting transmission power and the maximum transmitting power of the transmitting STA of the current channel.
As an improvement of the above solution, the calculating the maximum available transmission power of the transmitting STA in the current channel according to the maximum local transmission power, the maximum limited transmission power and the maximum transmission power of the transmitting STA specifically includes:
comparing the maximum local transmission power, the maximum limiting transmission power of the current channel and the maximum transmission power of the transmitting STA, and selecting the minimum power value from the maximum local transmission power, the maximum limiting transmission power and the maximum transmission power of the transmitting STA as the maximum available transmission power of the transmitting STA in the current channel.
As an improvement of the above scheme, the management frame is a Beacon frame or a Probe Response frame.
As an improvement of the above solution, the calculating the path loss between the transmitting STA and the receiving STA according to the TPC report frame returned by the receiving STA received by the transmitting STA specifically includes:
acquiring the receiving power of the TPC report frame received by the transmitting STA;
and calculating a difference value between the transmission power in the transmission power information in the TPC report frame and the receiving power of the TPC report frame received by the transmitting STA as the path loss between the transmitting STA and the receiving STA.
As an improvement of the foregoing solution, the calculating the set of available bandwidths of the wireless network according to the maximum available transmission power, the path loss, and CCA thresholds under different bandwidths in the set of available candidate bandwidths specifically includes:
calculating the receiving power of the receiving STA according to the maximum available transmission power and the path loss;
and comparing and analyzing the receiving power of the receiving STA with CCA thresholds corresponding to secondary channels under different bandwidths in the available candidate bandwidth set, and determining the available bandwidth set of the wireless network.
As an improvement of the above solution, the method further includes:
and periodically updating the maximum available bandwidth according to a preset time period.
In a second aspect, the present invention provides a WLAN-based bandwidth selection apparatus, including:
an available bandwidth monitoring module, configured to monitor an available candidate bandwidth set of the wireless network;
the maximum power transmission calculation module is used for calculating the maximum available transmission power of the transmitting STA in the current channel according to the management frame transmitted by the AP of the wireless network and the maximum transmission power of the transmitting STA, which are received by the transmitting STA before joining the BSS of the wireless network; wherein, the management frame contains the power limit information, the transmission power range information and the maximum transmission power information of the current channel of the BSS;
a path loss calculation module, configured to calculate a path loss between the transmitting STA and the receiving STA according to a TPC report frame returned by the receiving STA received by the transmitting STA; wherein the TPC report frame is generated by the receiving STA in response to a TPC request frame transmitted by the transmitting STA; the TPC report frame includes transmit power information of the TPC report frame;
an available bandwidth set calculation module, configured to calculate an available bandwidth set of the wireless network according to a maximum available transmission power of the transmitting STA, the path loss, and CCA thresholds under different bandwidths in the available candidate bandwidth set;
and the maximum available bandwidth selection module is used for selecting the maximum available bandwidth from the available bandwidth set of the wireless network.
In a third aspect, the present invention provides a computer readable storage medium comprising a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform the WLAN-based bandwidth selection method according to any one of the first aspects.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a WLAN-based bandwidth selection method according to a first embodiment of the present invention;
fig. 2 is a schematic block diagram of a WLAN-based bandwidth selection apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic block diagram of a WLAN-based bandwidth selection apparatus according to a third embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a bandwidth selection method based on WLAN according to a first embodiment of the present invention includes:
s11: listening to a set of available candidate bandwidths of the wireless network.
In the embodiment of the invention, the available candidate bandwidth of the wireless network can be monitored by executing a CCA mechanism of a PHY layer and a NAV mechanism of a MAC layer before the bandwidth selection is carried out. For the 802.11 protocol, the CCA mechanism is mainly used for detecting the idle state of the channel; the NAV is a timer provided by the MAC layer, which stores the duration of the medium used by other STAs, and when the duration in the data transmitted by other STAs is greater than the stored time, the STA updates its NAV, and when the NAV value is 0 and the PHY layer indicates that the current medium is available, the STA can transmit data. In the embodiment of the invention, the idle state of the channel and the NAV value obtained by executing the CCA mechanism are used for judging the theoretically available bandwidth as the available candidate bandwidth of the wireless network.
S12: calculating the maximum available transmission power of a transmitting STA in a current channel according to a management frame transmitted by an AP of the wireless network and received by the transmitting STA before joining a BSS of the wireless network and the maximum transmission power of the transmitting STA; the management frame includes power limitation information, transmission power range information and maximum transmission power information of the current channel of the BSS.
S13: calculating the path loss between the sending STA and the receiving STA according to a TPC report frame returned by the receiving STA and received by the sending STA; wherein the TPC report frame is generated by the receiving STA in response to a TPC request frame transmitted by the transmitting STA; the TPC report frame includes transmit power information of the TPC report frame.
S14: and calculating the available bandwidth set of the wireless network according to the maximum available transmission power of the sending STA, the path loss and CCA thresholds under different bandwidths in the available candidate bandwidth set.
S15: and selecting the maximum available bandwidth from the available bandwidth set of the wireless network.
In the embodiment of the invention, firstly, the available candidate bandwidth set of a wireless network is monitored, and then, the maximum transmission power which can be used under the current channel and the path loss index of the current channel are determined by aiming at a transmitting STA which is used as a data transmitting end; combining with CCA thresholds under different bandwidths, screening out available bandwidths, and finally selecting the maximum available bandwidth based on the available bandwidths; meanwhile, by combining power control, channel overhead and energy consumption are saved, and the situation that a receiving end cannot normally receive signals is avoided.
In an alternative embodiment, the method further comprises:
and periodically updating the maximum available bandwidth according to a preset time period.
In the embodiment of the present invention, the above steps S11 to S14 are repeated every time a period of time (the initial value is 1S, which can be adjusted according to the actual situation) elapses. The transmitting STA will send TPC request frames again to the receiving STA, which gives feedback. The transmitting STA reselects the bandwidth based on the new path loss. Namely, the invention automatically executes a bandwidth selection process once every time period passes, and ensures that the bandwidth selection can adapt to complex and changeable wireless channel conditions.
In an alternative embodiment, the monitoring the available candidate bandwidth set of the wireless network specifically includes:
and identifying the available candidate bandwidth set of the wireless network according to the idle state of the channel of the wireless network and the NAV value of the channel.
In an optional embodiment, the calculating the maximum available transmission power of the transmitting STA in the current channel according to the management frame sent by the AP of the wireless network and the maximum transmission power of the transmitting STA, which are received by the transmitting STA before joining the BSS of the wireless network, specifically includes:
calculating the maximum local transmission power of the current channel according to the power limit information and the maximum transmission power information in the management frame; wherein the power limitation information includes a local power limitation;
determining the maximum limit transmission power of the current channel according to the transmission power range information in the management frame;
and calculating the maximum available transmission power of the transmitting STA in the current channel according to the maximum local transmission power, the maximum limiting transmission power and the maximum transmitting power of the transmitting STA of the current channel.
Preferably, the management frame is a Beacon frame or a Probe Response frame.
In an optional embodiment, the calculating the maximum available transmission power of the transmitting STA in the current channel according to the maximum local transmission power, the maximum limited transmission power and the maximum transmission power of the transmitting STA specifically includes:
comparing the maximum local transmission power, the maximum limiting transmission power of the current channel and the maximum transmission power of the transmitting STA, and selecting the minimum power value from the maximum local transmission power, the maximum limiting transmission power and the maximum transmission power of the transmitting STA as the maximum available transmission power of the transmitting STA in the current channel.
Before a STA joins a BSS, it receives a Beacon frame (or Probe Response frame) sent by the AP, where the frame includes power limitation information (Power Constrai nt e l ement), transmission power ranges (Transmit Power Enve l ope e l ement) and Country e l ement; where Country e l ement indicates the maximum transmission power of the current channel. In general, the AP will specify the maximum regulated power limit and the maximum local power limit allowed by the current channel of the BSS, which are respectively embodied in the three elements (e-elements). Wherein the maximum local transmission power is defined as: the channel maximum transmit power defined in Country e l ement minus the local power limit specified in Power Constrai nt e l ement. Second, when the STA connects to the AP, the frame of (Re) associat ion Request frames sent by the STA will contain Power Capab i l ity e l ement, which contains the maximum and minimum transmission power that the STA can use to transmit data on the current channel.
In the embodiment of the invention, the transmitting STA can judge the maximum available transmission power of the transmitting STA in the current channel by combining the constraint condition of the transmitting STA given by the AP and the constraint condition of the transmitting STA, and the judgment formula is as follows:
P max ＝ mi n{P R , P L , P STA }. (1)
wherein P is max P for transmitting maximum available transmission power of current channel of STA R To limit the transmission power to the maximum, P L For maximum local transmission power, P STA Maximum transmission power supported by the STA.
In an optional embodiment, the calculating the path loss between the sending STA and the receiving STA according to the TPC report frame returned by the receiving STA received by the sending STA specifically includes:
acquiring the receiving power of the TPC report frame received by the transmitting STA;
and calculating a difference value between the transmission power in the transmission power information in the TPC report frame and the receiving power of the TPC report frame received by the transmitting STA as the path loss between the transmitting STA and the receiving STA.
In the 802.11ac protocol provision, a STA may send TPC (Transmit Power Contro l) a request frame to a partner before communicating with another AP or STA, requesting the partner to return a TPC report frame including a TPC report element whose content of the transmit power field indicates transmit power information, including transmit power, for transmitting the report frame. Based on the transmission power and the reception power when the transmitting STA receives the report frame, the transmitting STA can calculate the path loss (path l oss) of the wireless communication link between the transmitting and receiving parties, and the calculation method is as follows:
PL ＝ P TX - P RX . (2)
wherein PL is the path loss of the current transceiver and P TX To transmit power of TPC report frame, P RX The received power for receiving the TPC report frame.
In an alternative embodiment, the calculating the set of available bandwidths of the wireless network according to the maximum available transmission power, the path loss and CCA thresholds under different bandwidths in the set of available candidate bandwidths specifically includes:
calculating the receiving power of the receiving STA according to the maximum available transmission power and the path loss;
and comparing and analyzing the receiving power of the receiving STA with CCA thresholds corresponding to secondary channels under different bandwidths in the available candidate bandwidth set, and determining the available bandwidth set of the wireless network.
The 802.11ac protocol specifies that the selectable bandwidths for wireless communications are 20MHz, 40MHz, 80MHz, 160MHz, 80+80MHz. CCA decision thresholds are different for different bandwidths, summarized in the following table:
bandwidth of a communication device Primary channel Secondary channel
20MHz -82dBm
40MHz -79dBm -72dBm
80MHz -76dBm -69dBm
160MHz -73dBm -66dBm
In the embodiment of the invention, the available bandwidth set can be calculated according to different CCA thresholds under different bandwidths, the available maximum transmitting power of the transmitting STA and the real-time path loss of the transmitting and receiving parties. The method comprises the following steps:
first calculate, at maximum available transmission power P max Reception power P of receiving STA when data transmission is performed rcv The method comprises the following steps:
P rcv ＝ P max – PL. (3)
wherein PL represents a path loss between the transmitting STA and the receiving STA.
In order to avoid collisions with STAs of different protocol versions on the secondary channel, the present invention uses the CCA threshold of the secondary channel as a decision condition for the case of 40MHz, 80MHz, 160 MHz. Thus, when P rcv <-at 66dBm, a 160MHz bandwidth is not selectable; p (P) rcv <-69dBm, the 80MHz bandwidth is not selectable; p (P) rcv <-a bandwidth of 40MHz is not selectable at 72 dBm; p (P) rcv <At-82 dBm, data cannot be normally transmitted. Simultaneously combining CCA mechanism and MA of PHY layer specified by protocolThe NAV mechanism of layer C selects the maximum available bandwidth.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
1. firstly, monitoring an available candidate bandwidth set of a wireless network, and then determining the maximum transmission power which can be used under a current channel and the path loss index of the current channel according to a transmitting STA which is used as a data transmitting end; combining with CCA thresholds under different bandwidths, screening out available bandwidths, and finally selecting the maximum available bandwidth based on the available bandwidths; meanwhile, by combining power control, channel overhead and energy consumption are saved, and the situation that a receiving end cannot normally receive signals is avoided.
2. Every time period (the initial value is 1s, which can be adjusted according to the actual situation), the sending STA will send TPC request frames to the receiving STA again, and the receiving STA gives feedback. The transmitting STA reselects the bandwidth based on the new path loss. Namely, the invention automatically executes a bandwidth selection process once every time period passes, and ensures that the bandwidth selection can adapt to complex and changeable wireless channel conditions.
A second embodiment of the present invention provides a WLAN-based bandwidth selection apparatus, including:
an available bandwidth monitoring module 1, configured to monitor an available candidate bandwidth set of the wireless network;
a maximum transmission power calculation module 2, configured to calculate, according to a management frame sent by an AP of the wireless network and received by a transmitting STA before joining a BSS of the wireless network, and a maximum transmission power of the transmitting STA, a maximum available transmission power of the transmitting STA in a current channel; wherein, the management frame contains the power limit information, the transmission power range information and the maximum transmission power information of the current channel of the BSS;
a path loss calculation module 3, configured to calculate a path loss between the transmitting STA and the receiving STA according to a TPC report frame returned by the receiving STA received by the transmitting STA; wherein the TPC report frame is generated by the receiving STA in response to a TPC request frame transmitted by the transmitting STA; the TPC report frame includes transmit power information of the TPC report frame;
an available bandwidth set calculating module 4, configured to calculate an available bandwidth set of the wireless network according to a maximum available transmission power of the transmitting STA, the path loss, and CCA thresholds under different bandwidths in the available candidate bandwidth set;
a maximum available bandwidth selecting module 5, configured to select a maximum available bandwidth from the available bandwidth set of the wireless network.
In an alternative embodiment, the available bandwidth monitoring module 1 is specifically configured to identify the available candidate bandwidth set of the wireless network according to the idle busy state of the channel and the NAV value of the channel of the wireless network.
In an alternative embodiment, the maximum transmission power calculation module 2 includes:
a maximum local transmission power calculation unit, configured to calculate a maximum local transmission power of the current channel according to the power limitation information and the maximum transmission power information in the management frame; wherein the power limitation information includes a local power limitation;
a maximum limit transmission power calculation unit, configured to determine a maximum limit transmission power of the current channel according to the transmission power range information in the management frame;
and the maximum available transmission power calculation unit is used for calculating the maximum available transmission power of the transmitting STA in the current channel according to the maximum local transmission power, the maximum limiting transmission power and the maximum transmitting power of the transmitting STA of the current channel.
In an alternative embodiment, the maximum available transmission power calculation unit includes:
and the power comparison unit is used for comparing the maximum local transmission power, the maximum limiting transmission power of the current channel and the maximum transmission power of the transmitting STA, and selecting the minimum power value from the maximum local transmission power, the maximum limiting transmission power and the maximum transmission power of the transmitting STA as the maximum available transmission power of the transmitting STA in the current channel.
In an alternative embodiment, the management frame is a Beacon frame or a Probe Response frame.
In an alternative embodiment, the path loss calculation module 3 includes:
a received power obtaining unit, configured to obtain received power of a TPC report frame received by the transmitting STA;
and the power difference calculating unit is used for calculating the difference between the transmission power in the transmission power information in the TPC report frame and the receiving power of the TPC report frame received by the transmitting STA as the path loss between the transmitting STA and the receiving STA.
In an alternative embodiment, the available bandwidth set calculation module 4 includes:
a received power calculation unit, configured to calculate a received power of the receiving STA according to the maximum available transmission power and the path loss;
and the available bandwidth set determining unit is used for comparing and analyzing the receiving power of the receiving STA with CCA thresholds corresponding to secondary channels under different bandwidths in the available candidate bandwidth sets to determine the available bandwidth set of the wireless network.
In an alternative embodiment, the apparatus further comprises:
and the maximum available bandwidth period updating module is used for periodically updating the maximum available bandwidth according to a preset time period. It should be noted that, the bandwidth selecting device based on WLAN provided by the embodiment of the present invention is used for executing all the method flows of the bandwidth selecting method based on WLAN, and the working principles and beneficial effects of the two correspond one to one, so that the description is omitted.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Referring to fig. 3, a block diagram of a WLAN-based bandwidth selection apparatus according to a third embodiment of the present invention, as shown in fig. 3, includes: at least one processor 11, such as a CPU, at least one network interface 14 or other user interface 13, a memory 15, at least one communication bus 12, the communication bus 12 being for enabling connected communication between these components. The user interface 13 may optionally include a USB interface, as well as other standard interfaces, wired interfaces. The network interface 14 may optionally include a Wi-Fi interface, as well as other wireless interfaces. The memory 15 may comprise high-speed RAM memory or may further comprise non-volatile memory (non-vo l at i l ememory), such as at least one disk memory. The memory 15 may optionally comprise at least one memory device located remotely from the aforementioned processor 11.
In some embodiments, the memory 15 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
an operating system 151 containing various system programs for implementing various basic services and handling hardware-based tasks;
program 152.
Specifically, the processor 11 is configured to invoke the program 152 stored in the memory 15 to execute the WLAN-based bandwidth selection method described in the above embodiment, for example, step S11 shown in fig. 1. Alternatively, the processor may implement the functions of the modules/units in the above-described device embodiments when executing the computer program, for example, an available bandwidth listening module.
The computer program may be divided into one or more modules/units, which are stored in the memory and executed by the processor to accomplish the present invention, for example. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the WLAN-based bandwidth selection apparatus.
The bandwidth selection device based on the WLAN can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing devices. The WLAN-based bandwidth selection device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of a WLAN-based bandwidth selection device and does not constitute a limitation of the WLAN-based bandwidth selection device, and may include more or fewer components than shown, or may combine certain components, or different components.
The processor 11 may be a central processing unit (Centra l Process i ng Unit, CPU), but may also be other general purpose processors, digital signal processors (Digita l Signa l Processor, DSP), application specific integrated circuits (App l icat ion Specifi C I ntegrated Ci rcuit, asic), off-the-shelf programmable gate arrays (Fie l d-Programmab l e Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 11 is a control center of the WLAN-based bandwidth selection apparatus, and connects various parts of the entire WLAN-based bandwidth selection apparatus using various interfaces and lines.
The memory 15 may be used to store the computer program and/or module, and the processor 11 may implement various functions of the WLAN-based bandwidth selection apparatus by running or executing the computer program and/or module stored in the memory and invoking data stored in the memory. The memory 15 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory 15 may include high-speed random access memory, and may also include nonvolatile memory, such as a hard disk, memory, plug-in hard disk, smart memory Card (Smart Med ia Card, SMC), secure Digital (SD) Card, flash Card (F l ash Card), at least one disk storage device, flash memory device, or other volatile solid state storage device.
Wherein the WLAN-based bandwidth selection device integrated module/unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier wave signal, a telecommunication signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
A fourth embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, where the computer program when executed controls a device in which the computer readable storage medium is located to perform the WLAN-based bandwidth selection method according to any one of the first embodiments.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (9)

1. A method for WLAN-based bandwidth selection, comprising:
monitoring an available candidate bandwidth set of the wireless network;
calculating the maximum available transmission power of a transmitting STA in a current channel according to a management frame transmitted by an AP of the wireless network and received by the transmitting STA before joining a BSS of the wireless network and the maximum transmission power of the transmitting STA; wherein, the management frame contains the power limit information, the transmission power range information and the maximum transmission power information of the current channel of the BSS;
calculating the path loss between the sending STA and the receiving STA according to a TPC report frame returned by the receiving STA and received by the sending STA; wherein the TPC report frame is generated by the receiving STA in response to a TPC request frame transmitted by the transmitting STA; the TPC report frame includes transmit power information of the TPC report frame;
calculating an available bandwidth set of the wireless network according to the maximum available transmission power of the transmitting STA, the path loss and CCA thresholds under different bandwidths in the available candidate bandwidth set;
selecting a maximum available bandwidth from a set of available bandwidths of the wireless network;
the calculating the available bandwidth set of the wireless network according to the maximum available transmission power, the path loss and CCA thresholds under different bandwidths in the available candidate bandwidth set specifically includes:
calculating the receiving power of the receiving STA according to the maximum available transmission power and the path loss;
and comparing and analyzing the receiving power of the receiving STA with CCA thresholds corresponding to secondary channels under different bandwidths in the available candidate bandwidth set, and determining the available bandwidth set of the wireless network.
2. The WLAN-based bandwidth selection method of claim 1, wherein the listening to the available candidate bandwidth set of the wireless network specifically comprises:
and identifying the available candidate bandwidth set of the wireless network according to the idle state of the channel of the wireless network and the NAV value of the channel.
3. The WLAN-based bandwidth selection method according to claim 1, wherein the calculating the maximum available transmission power of the transmitting STA in the current channel according to the management frame transmitted by the AP of the wireless network and the maximum transmission power of the transmitting STA, which are received by the transmitting STA before joining the BSS of the wireless network, specifically includes:
calculating the maximum local transmission power of the current channel according to the power limit information and the maximum transmission power information in the management frame; wherein the power limitation information includes a local power limitation;
determining the maximum limit transmission power of the current channel according to the transmission power range information in the management frame;
and calculating the maximum available transmission power of the transmitting STA in the current channel according to the maximum local transmission power, the maximum limiting transmission power and the maximum transmitting power of the transmitting STA of the current channel.
4. The WLAN-based bandwidth selection method as claimed in claim 3, wherein the calculating the maximum available transmission power of the transmitting STA in the current channel according to the maximum local transmission power of the current channel, the maximum limited transmission power, and the maximum transmission power of the transmitting STA specifically includes:
comparing the maximum local transmission power, the maximum limiting transmission power of the current channel and the maximum transmission power of the transmitting STA, and selecting the minimum power value from the maximum local transmission power, the maximum limiting transmission power and the maximum transmission power of the transmitting STA as the maximum available transmission power of the transmitting STA in the current channel.
5. A WLAN based bandwidth selection method as claimed in claim 1 or 3, characterized in that the management frame is a Beacon frame or a Probe Response frame.
6. The WLAN-based bandwidth selection method as claimed in claim 1 or 3, wherein the calculating a path loss between the transmitting STA and the receiving STA according to a TPC report frame returned by the receiving STA received by the transmitting STA specifically includes:
acquiring the receiving power of the TPC report frame received by the transmitting STA;
and calculating a difference value between the transmission power in the transmission power information in the TPC report frame and the receiving power of the TPC report frame received by the transmitting STA as the path loss between the transmitting STA and the receiving STA.
7. The WLAN-based bandwidth selection method of claim 1, wherein the method further comprises:
and periodically updating the maximum available bandwidth according to a preset time period.
8. A WLAN-based bandwidth selection apparatus, comprising:
an available bandwidth monitoring module, configured to monitor an available candidate bandwidth set of the wireless network;
the maximum transmission power calculation module is used for calculating the maximum available transmission power of the transmitting STA in the current channel according to the management frame transmitted by the AP of the wireless network and the maximum transmission power of the transmitting STA, which are received by the transmitting STA before joining the BSS of the wireless network; wherein, the management frame contains the power limit information, the transmission power range information and the maximum transmission power information of the current channel of the BSS;
a path loss calculation module, configured to calculate a path loss between the transmitting STA and the receiving STA according to a TPC report frame returned by the receiving STA received by the transmitting STA; wherein the TPC report frame is generated by the receiving STA in response to a TPC request frame transmitted by the transmitting STA; the TPC report frame includes transmit power information of the TPC report frame;
an available bandwidth set calculation module, configured to calculate an available bandwidth set of the wireless network according to a maximum available transmission power of the transmitting STA, the path loss, and CCA thresholds under different bandwidths in the available candidate bandwidth set;
a maximum available bandwidth selection module, configured to select a maximum available bandwidth from a set of available bandwidths of the wireless network;
the available bandwidth set calculation module includes:
a received power calculation unit, configured to calculate a received power of the receiving STA according to the maximum available transmission power and the path loss;
and the available bandwidth set determining unit is used for comparing and analyzing the receiving power of the receiving STA with CCA thresholds corresponding to secondary channels under different bandwidths in the available candidate bandwidth sets to determine the available bandwidth set of the wireless network.
9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform the WLAN-based bandwidth selection method according to any of claims 1 to 7.
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