CN108696324B - Link quality detection method and device and wireless access equipment - Google Patents
Link quality detection method and device and wireless access equipment Download PDFInfo
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- CN108696324B CN108696324B CN201810532388.8A CN201810532388A CN108696324B CN 108696324 B CN108696324 B CN 108696324B CN 201810532388 A CN201810532388 A CN 201810532388A CN 108696324 B CN108696324 B CN 108696324B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- 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
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- 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
Abstract
The embodiment of the invention provides a link quality detection method, a device and wireless access equipment, wherein the link quality detection method can comprise the following steps: receiving a link quality detection instruction; aiming at a wireless terminal in a dormant state, under the condition that a wireless access device does not cache a data message to be transmitted to the wireless terminal, a TIM (time value indication) domain is set in a beacon frame to be broadcasted according to an association identifier of the wireless terminal; broadcasting a beacon frame according to a preset beacon period; receiving an empty data message sent by the wireless terminal after the beacon frame is acquired; and determining the link quality with the wireless terminal according to the received signal strength of the empty data message. By the scheme, the link test of the wireless terminal in the dormant state can be realized.
Description
Technical Field
The present invention relates to the field of wireless network technologies, and in particular, to a link quality detection method, an apparatus, and a wireless access device.
Background
WLAN (Wireless Local Area Network) refers to a Local Area Network formed by replacing a traditional transmission medium with a Wireless channel, and the appearance of WLAN can enable terminals on the Network to get rid of the constraint of a wired connection medium, thereby realizing mobility of each terminal. Since the transmission medium of the WLAN is radio waves and is susceptible to external interference, it is necessary to detect the link quality in order to ensure the reliability of transmission.
Currently, for detecting link quality, an AP (Access Point) sends a link detection message to an STA (Station, wireless terminal), the STA replies a response message to the AP after receiving the link detection message, and the AP obtains a detection result of the link quality by obtaining an RSSI (received Signal Strength Indicator) of the response message after receiving the response message replied by the STA.
For the above link quality detection method, the AP may receive the response packet replied by the STA for the link detection packet only when the STA is in the active state, and if the STA is in the dormant state, the STA does not receive data nor transmit data, that is, the STA does not respond to the link detection packet transmitted by the AP, so that the AP cannot perform a link test for the STA in the dormant state.
Disclosure of Invention
The embodiment of the invention aims to provide a link quality detection method, a link quality detection device and wireless access equipment, so as to realize link test on an STA in a dormant state. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a link quality detection method, which is applied to a wireless access device, and the method includes:
receiving a link quality detection instruction;
aiming at a wireless terminal in a dormant state, under the condition that the wireless access equipment does not cache a data message to be transmitted to the wireless terminal, a traffic indication TIM (traffic indication time value) domain is set in a beacon frame to be broadcasted according to an association identifier of the wireless terminal;
broadcasting the beacon frame according to a preset beacon period;
receiving an empty data message sent by the wireless terminal after the wireless terminal acquires the beacon frame;
and determining the link quality between the wireless terminal and the wireless terminal according to the received signal strength of the empty data message.
In a second aspect, an embodiment of the present invention provides a link quality detection apparatus, which is applied to a wireless access device, and the apparatus includes:
the instruction receiving module is used for receiving a link quality detection instruction;
the wireless access device comprises a setting module, a sending module and a receiving module, wherein the setting module is used for setting a traffic indication TIM (traffic indication TIM) domain in a beacon frame to be broadcasted according to an association identifier of a wireless terminal under the condition that the wireless access device does not cache a data message to be transmitted to the wireless terminal aiming at the wireless terminal in a dormant state;
the broadcast module is used for broadcasting the beacon frame according to a preset beacon period;
the message receiving module is used for receiving the empty data message sent by the wireless terminal after the beacon frame is obtained;
and the determining module is used for determining the link quality between the wireless terminal and the wireless terminal according to the received signal strength of the empty data message.
In a third aspect, an embodiment of the present invention provides a wireless access device, including a processor and a machine-readable storage medium, the machine-readable storage medium storing machine-executable instructions executable by the processor, the processor being caused by the machine-executable instructions to: the method steps of the first aspect of the embodiments of the present invention are implemented.
The link quality detection method, the link quality detection device and the wireless access equipment are applied to the wireless access equipment, after a link quality detection instruction is received, aiming at a wireless terminal in a dormant state, under the condition that the wireless access equipment does not cache a data message to be transmitted to the wireless terminal, a TIM (time value) field is set in a beacon frame to be broadcasted according to an association identifier of the wireless terminal, the beacon frame is broadcasted according to a preset beacon period, a null data message sent by the wireless terminal after the wireless terminal acquires the beacon frame is received, and the link quality between the wireless terminal and the wireless terminal is determined according to the received signal strength of the null data message. For a wireless terminal which does not buffer a data message and is in a dormant state, a wireless access device sets a TIM domain in a beacon frame to be broadcasted, the wireless access device broadcasts the beacon frame with the TIM domain, and when the wireless terminal in the dormant state wakes up to acquire the beacon frame, the wireless access device can be considered to buffer a message to be transmitted to the wireless terminal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a link quality detection method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a link quality detection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wireless access device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First, relevant concepts related to the method provided by the embodiment of the present invention are briefly described.
Beacon frame (Beacon frame): the data frame is a type of a data frame in the WLAN, and is periodically transmitted by the AP, so that the STA discovers the WLAN and determines whether a data packet is cached in the AP.
Listen Interval (listening period): when the STA connects to the WLAN and negotiates operating parameters with the AP, the sleep time calculated by using Beacon Interval (Beacon period) as a unit, generally, Listen Interval is an integer multiple of Beacon Interval; the STA reports to the AP, namely tells the AP, if the STA enters a sleep state, the STA actively wakes up after every Listen Interval to monitor the Beacon frame. The AP, upon receiving the Listen Interval, stores the value of Listen Interval.
TIM (Traffic Indication Map) field: after confirming that the data message reaching the STA in the dormant state is cached in the AP, the AP informs the STA by setting a TIM (time information) field in a Beacon frame, wherein the data message is cached in the AP.
In order to implement a link test on an STA in a dormant state, embodiments of the present invention provide a link quality detection method, an apparatus, and a wireless access device.
Next, a method for detecting link quality according to an embodiment of the present invention is described first.
An executive body of the link quality detection method provided by the embodiment of the invention can be a wireless Access device, and the wireless Access device can be an Access Controller (WLAN AC) in a networking environment of Access Controller plus FitAP (thin AP) or an AP in a networking environment of FAT AP (FAT AP). The method for implementing the link quality detection method provided by the embodiment of the invention may be at least one of software, a hardware circuit and a logic circuit arranged in the execution main body.
The STA in the active state may be detected by using the existing link quality detection method. After the STA accesses the WLAN, if the data message exists, the data message is normally interacted between the wireless access equipment and the STA according to the original flow, and if no data message interaction is continuously carried out between the wireless access equipment and the STA, the STA can enter a dormant state. The wireless access equipment can determine whether the STA is in a dormant state or not through information interaction with the STA, for the STA in the dormant state, the wireless access equipment caches the data message to be transmitted to the STA, and if the data message to be transmitted to the STA is cached, the wireless access equipment informs the STA to wake up and receive the data message through broadcasting a Beacon frame.
When the STA monitors the Beacon frame, the wireless access equipment informs the wireless access equipment of caching the data message to be sent to the STA through a TIM (time information System) domain arranged in the Beacon frame, and when the STA is awakened from a dormant state, the STA receives the data message sent by the wireless access equipment. And link quality detection can be carried out according to the existing link quality detection method in the process of awakening the STA to receive the data message.
After the STA wakes up and listens to the Beacon frame, the wireless access device may not cache the data packet to be transmitted to the STA, and thus the STA may not send any packet or information to the wireless access device, so that the STA may immediately perform a sleep state after determining that the wireless access device does not cache the data packet to be transmitted to the STA, and at this time, the wireless access device may not detect the link quality. As can be seen, in the related art, link measurement cannot be performed on an STA in a sleep state.
As shown in fig. 1, the link quality detection method provided in the embodiment of the present invention may include the following steps:
s101, receiving a link quality detection instruction.
The link quality detection instruction may be an instruction sent by the user terminal to the wireless access device, or may be an instruction periodically generated on the wireless access device, where the link quality detection instruction is used to drive the wireless access device to detect a link in the network. The link quality detection instruction may carry information of the link to be detected, for example, an opposite-end STA identifier of the link to be detected, or the link quality detection instruction may not carry information of the link to be detected, and the wireless access device performs link quality detection on all links after receiving the link quality detection instruction. And S102, aiming at the wireless terminal in the dormant state, under the condition that the wireless access equipment does not cache the data message to be transmitted to the wireless terminal, setting a TIM (time value indication) domain in a beacon frame to be broadcasted according to the association identifier of the wireless terminal.
The link measurement method of the embodiment of the invention can be used for measuring the link state of the STA in the dormant state, when the wireless access equipment receives a link detection instruction, aiming at the wireless terminal in the dormant state at present, when the wireless access equipment does not have a cache data message, a TIM domain can be set in a Beacon frame to be broadcasted according to the AID (Association Identifier) of the wireless terminal, so that by setting the TIM domain in the Beacon frame, even if the cache data message does not exist, the STA can be informed to actively obtain the message sent to the wireless access equipment after awakening through the TIM domain, namely, the STA is driven to actively send the message or information to the wireless access equipment to be used as the reference for link quality detection.
The TIM field is actually a traffic indication map based on a Bitmap (bit set) structure to identify cached information for the wireless access device. The TIM field may specifically be a Delivery Traffic Indication Map (DTIM) field, which is a special TIM field and indicates, in addition to the unicast information cached by the wireless access device, the multicast information or the broadcast information cached by the wireless access device. Generally, when a wireless access device broadcasts a Beacon frame, each Beacon frame includes a TIM field, but the TIM field is not specifically a DTIM field, and two parameters, namely, DTIM Count (DTIM Count) and DTIM Period (DTIM interval), need to be considered. DTIM Period represents the time length between two Beacon frames with a TIM domain, and the time length is integral multiple of Beacon Interval; the DTIM Count represents the number of Beacon frames transmitted between two Beacon frames with a TIM domain set. When the DTIM Count is 0, it means that the TIM is a DTIM.
The TIM field includes a Bitmap Control (bit set Control) and a Partial Virtual Bitmap (Partial Virtual bit set) bit, and is used to notify the STA that there is a cached data packet. The Bitmap Control is a byte, for example, bit 0 is used to identify whether a data packet to be transmitted to the STA with AID 0 is cached, and if the bit is 1 and DTIM Count is 0, it indicates that a broadcast data packet or a multicast data packet is cached; the remaining 7 bits and the Partial Virtual Bitmap cooperate to indicate that the wireless access device buffers the unicast data packet of the STA having the corresponding AID.
The Beacon Frame may further include a Frame Control Field (Frame Control Field), where a flag More Data is used to indicate that, after the STA changes from the sleep state to the active state, if the flag is 1, the STA indicates that the wireless access device still has a buffered Data packet of the STA and is not sent to the STA; if the flag bit is 0, it indicates that the wireless access device has sent all cached data packets of the STA to the STA.
S103, according to a preset beacon period, broadcasting a beacon frame carrying the TIM domain.
The Beacon Interval is a period of broadcasting the Beacon frame, the Beacon frame is used for informing the STA whether to cache the data message of the STA, and the Beacon Interval is usually set to be smaller in order to ensure the instantaneity of awakening the STA to acquire the data message. Because the wireless access device sends the Beacon frame in a broadcast mode, all STAs in the network can receive the Beacon frame, and the TIM field is set based on the AID of the STA, the STA can determine whether the wireless access device buffers the data packet of the STA through the TIM field in the Beacon frame.
And S104, receiving the empty data message sent by the wireless terminal after the beacon frame is obtained.
The STA may acquire the Listen Interval when entering the sleep state, start timing from entering the sleep state, and actively wake up to monitor the Beacon frame broadcast by the wireless access device when the Listen Interval is reached. The Listen Interval is calculated according to the Beacon Interval of the Beacon frame sent by the wireless access device when the STA is connected to the WLAN and negotiates working parameters with the wireless access device, and is usually set to be an integral multiple of the Beacon Interval in order to ensure real-time performance of data monitoring.
The Listen Interval negotiated by the STA and the wireless access device may not be too large, and if the value is set to be too large, the waiting time of the STA may be too long, which affects real-time transmission of data packets, and the Listen Interval may be set to be less than or equal to 10 Beacon intervals.
After the STA acquires the Beacon frame, because the TIM field is set in the Beacon frame, the STA may consider that the wireless access device buffers a DATA packet to be transmitted to the STA, and then the STA may actively send a NULL DATA packet to the wireless access device to acquire the DATA packet buffered in the wireless access device.
Generally, after the STA wakes up, if a Beacon frame sent by the wireless access device is received, NULL DATA is sent to the wireless access device at the highest rate to obtain a message buffered for the STA in the wireless access device. Therefore, the wireless access device can acquire the value of the rssi (received Signal Strength indicator) according to the NULL DATA message, thereby determining the link quality between the wireless access device and the wireless link.
Because of possible instability of a single DATA, several sets of RSSI values of NULL DATA may be obtained. In an optional implementation manner, after S104, the method may further include: and not sending a confirmation message to the wireless terminal so that the wireless terminal resends the empty data message when the preset time is reached.
Specifically, a rate table is generally pre-established in the STA, rates of different sizes are recorded in the rate table, the STA generally preferentially selects a high rate to transmit NULL DATA packets, for example, the rates in the rate table have six rates, the STA preferentially selects the first three NULL DATA packets to be transmitted at the rate of 6, and if an ACK packet sent by the wireless access device is not received all the time, the STA preferentially selects the subsequent NULL DATA packets to be transmitted at the rate of 5.
After receiving the first NULL DATA message sent by the STA, the wireless access device does not send an ACK (Acknowledgement) message to the STA, and the STA may consider that the sent NULL DATA message fails to be sent or the ACK message sent by the wireless access device fails to be sent, and may resend the NULL DATA message when the preset time is reached. Thus, the RSSI of the sets of NULL DATA can be obtained.
Optionally, after S104, the method may further include:
judging whether the rates of continuously receiving the empty data messages for multiple times are all larger than a first preset rate;
if the rates are all larger than the first preset rate, continuously and repeatedly sending the null data messages to the wireless terminal according to a second preset rate, wherein the first preset rate is larger than the second preset rate;
and receiving a confirmation message fed back by the wireless terminal after acquiring each empty data message.
The first preset rate is a preset value determined as a high rate, for example, if the rate is greater than 5, the first preset rate may be set to 5. If the STA continuously sends a plurality of NULL DATA packets at a high rate, in order to improve the accuracy of link detection and the coverage of different rates, the wireless access device may send a plurality of NULL DATA packets to the STA at a low rate, the STA may feed back an ACK packet to the wireless access device after receiving the NULL DATA packet, and the ACK packet fed back by the STA is sent at a low rate. The rate of the NULL DATA packet sent by the wireless access device may be a second preset rate, and the second preset rate may be any rate smaller than the first preset rate, or may be any rate smaller than a preset value determined as a low rate, for example, if the rate is smaller than 3, the second preset rate may be set to any value smaller than 3.
Since the case that the STA transmits the NULL DATA packet at a low rate is not excluded, after S104, the method may further include:
judging whether the rates of continuously receiving the empty data messages for multiple times are all less than a second preset rate;
if the rates are smaller than a second preset rate, continuously and repeatedly sending empty data messages to the wireless terminal according to a first preset rate, wherein the first preset rate is larger than the second preset rate;
and receiving a confirmation message fed back by the wireless terminal after acquiring each empty data message.
The second preset rate is a preset value judged as a low rate. If the STA continuously sends a plurality of NULL DATA messages at a low rate, in order to improve the accuracy of link detection and the coverage of different rates, the wireless access device may send a plurality of NULL DATA messages to the STA at a high rate, the STA may feed back an ACK message to the wireless access device after receiving the NULL DATA messages, and the ACK message fed back by the STA is sent at a high rate. The rate of the NULL DATA packet sent by the wireless access device may be a first preset rate, and the first preset rate may be any rate greater than a second preset rate, or any rate greater than a preset value determined as a high rate.
And S105, determining the link quality between the wireless terminal and the wireless terminal according to the received signal strength of the empty data message.
And determining the link quality between the wireless access equipment and the STA according to the RSSI of the NULL DATA. In this embodiment, the STA wakes up from the sleep state to perform the link quality detection, and after the STA finishes performing the link quality detection, the TIM field in the Beacon frame needs to be cleared, so that the STA can enter the sleep state, and thus, the STA can be prevented from being in a state of waking up to perform the link quality detection all the time.
Optionally, S105 may specifically be:
averaging the received signal strength of each received empty data message to obtain a first received signal strength, and averaging the received signal strength of each received confirmation message to obtain a second received signal strength;
and determining the link quality between the wireless terminal and the wireless terminal according to the first received signal strength and the second received signal strength.
Because the transmission rates of different NULL DATA messages and ACK messages are different, and the interference degrees received in each transmission process are different, the RSSI of each message is different, in order to improve the detection accuracy, the RSSI of each NULL DATA message can be averaged, the RSSI of each ACK message can be averaged, and the two average values are analyzed, so that the accurate link quality can be obtained.
Specifically, the timing when the wireless access device actively sends the NULL DATA packet to the STA may be to determine that NULL DATA packets sent by a preset number of STAs have been continuously received, for example, the preset number may be 2. That is, if the wireless access device receives two NULL DATA messages continuously sent by the STA to the wireless access device, the wireless access device may actively send the two NULL DATA messages to the STA to obtain two ACK messages at different rates.
By applying this embodiment, after receiving a link quality detection instruction, a wireless access device sets a TIM field in a beacon frame to be broadcasted according to an association identifier of a wireless terminal when the wireless access device does not cache a data packet to be transmitted to the wireless terminal in a dormant state, broadcasts the beacon frame according to a preset beacon period, receives a null data packet sent by the wireless terminal after obtaining the beacon frame, and determines link quality with the wireless terminal according to received signal strength of the null data packet. For a wireless terminal which does not buffer a data message and is in a dormant state, a wireless access device sets a TIM domain in a beacon frame to be broadcasted, the wireless access device broadcasts the beacon frame with the TIM domain, and when the wireless terminal in the dormant state wakes up to acquire the beacon frame, the wireless access device can be considered to buffer a message to be transmitted to the wireless terminal.
Corresponding to the foregoing method embodiment, an embodiment of the present invention provides a link quality detection apparatus, which is applied to a wireless access device, and as shown in fig. 2, the apparatus may include:
an instruction receiving module 210, configured to receive a link quality detection instruction;
a setting module 220, configured to set, for a wireless terminal in a dormant state, a traffic indication TIM field in a beacon frame to be broadcasted according to an association identifier of the wireless terminal when the wireless access device does not cache a data packet to be transmitted to the wireless terminal;
a broadcasting module 230, configured to broadcast the beacon frame according to a preset beacon period;
a message receiving module 240, configured to receive an empty data message sent by the wireless terminal after the beacon frame is obtained;
a determining module 250, configured to determine, according to the received signal strength of the null data packet, a link quality with the wireless terminal.
Optionally, the message receiving module 240 may be further configured to not send a confirmation message to the wireless terminal, so that the wireless terminal retransmits the null data message when the preset time is reached.
Optionally, the apparatus may further include:
the judging module is used for judging whether the rates of continuously and repeatedly receiving the empty data messages are all larger than a first preset rate;
a sending module, configured to send a null data packet to the wireless terminal continuously for multiple times according to a second preset rate if each rate is greater than the first preset rate, where the second preset rate is less than the first preset rate;
the message receiving module 240 may be further configured to receive a confirmation message fed back by the wireless terminal after the wireless terminal acquires each empty data message.
Optionally, the apparatus further comprises:
the judging module is used for judging whether the rates of continuously receiving the empty data messages for multiple times are all less than a second preset rate;
a sending module, configured to send, according to a first preset rate, a null data packet to the wireless terminal continuously for multiple times if each rate is less than the second preset rate, where the first preset rate is greater than the second preset rate;
the message receiving module 240 may be further configured to receive a confirmation message fed back by the wireless terminal after the wireless terminal acquires each empty data message.
Optionally, the determining module 250 may be specifically configured to:
averaging the received signal strength of each received empty data message to obtain a first received signal strength, and averaging the received signal strength of each received confirmation message to obtain a second received signal strength;
and determining the link quality between the wireless terminal and the wireless terminal according to the first received signal strength and the second received signal strength.
By applying this embodiment, after receiving a link quality detection instruction, a wireless access device sets a TIM field in a beacon frame to be broadcasted according to an association identifier of a wireless terminal when the wireless access device does not cache a data packet to be transmitted to the wireless terminal in a dormant state, broadcasts the beacon frame according to a preset beacon period, receives a null data packet sent by the wireless terminal after obtaining the beacon frame, and determines link quality with the wireless terminal according to received signal strength of the null data packet. For a wireless terminal which does not buffer a data message and is in a dormant state, a wireless access device sets a TIM domain in a beacon frame to be broadcasted, the wireless access device broadcasts the beacon frame with the TIM domain, and when the wireless terminal in the dormant state wakes up to acquire the beacon frame, the wireless access device can be considered to buffer a message to be transmitted to the wireless terminal.
In order to implement a link test on an STA in a dormant state, an embodiment of the present invention further provides a wireless access device, as shown in fig. 3, where the wireless access device may include: a processor 310 and a machine-readable storage medium 320, said machine-readable storage medium 320 storing machine-executable instructions executable by said processor 310, said processor 310 being caused by said machine-executable instructions to implement the steps of the link quality detection method as described above.
In this embodiment, the processor 310 can realize that: after receiving a link quality detection instruction, the wireless access equipment sets a TIM (time information) field in a beacon frame to be broadcasted according to an association identifier of the wireless terminal under the condition that the wireless access equipment does not cache a data message to be transmitted to the wireless terminal in a dormant state, broadcasts the beacon frame according to a preset beacon period, receives a null data message sent by the wireless terminal after obtaining the beacon frame, and determines the link quality between the wireless access equipment and the wireless terminal according to the received signal strength of the null data message. For a wireless terminal which does not buffer a data message and is in a dormant state, a wireless access device sets a TIM domain in a beacon frame to be broadcasted, the wireless access device broadcasts the beacon frame with the TIM domain, and when the wireless terminal in the dormant state wakes up to acquire the beacon frame, the wireless access device can be considered to buffer a message to be transmitted to the wireless terminal.
Corresponding to the link quality detection method provided in the foregoing embodiments, an embodiment of the present invention provides a machine-readable storage medium, storing machine-executable instructions, and implementing the steps of the above link quality detection method when the machine-readable storage medium is called and executed by a processor.
In this embodiment, the machine-readable storage medium stores an application program that executes the link quality detection method provided in the embodiment of the present invention when running, so that it is possible to implement: after receiving a link quality detection instruction, the wireless access equipment sets a TIM (time information) field in a beacon frame to be broadcasted according to an association identifier of the wireless terminal under the condition that the wireless access equipment does not cache a data message to be transmitted to the wireless terminal in a dormant state, broadcasts the beacon frame according to a preset beacon period, receives a null data message sent by the wireless terminal after obtaining the beacon frame, and determines the link quality between the wireless access equipment and the wireless terminal according to the received signal strength of the null data message. For a wireless terminal which does not buffer a data message and is in a dormant state, a wireless access device sets a TIM domain in a beacon frame to be broadcasted, the wireless access device broadcasts the beacon frame with the TIM domain, and when the wireless terminal in the dormant state wakes up to acquire the beacon frame, the wireless access device can be considered to buffer a message to be transmitted to the wireless terminal.
The machine-readable storage medium may include a RAM (Random Access Memory) and a NVM (Non-Volatile Memory), such as at least one disk Memory. Alternatively, the machine-readable storage medium may be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also a DSP (Digital Signal Processing), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
For the embodiments of the wireless access device and the machine-readable storage medium, since the contents of the related methods are substantially similar to those of the foregoing embodiments of the methods, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the embodiments of the methods.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus, the wireless access device, and the machine-readable storage medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and for the relevant points, reference may be made to part of the description of the method embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (11)
1. A link quality detection method is applied to a wireless access device, and comprises the following steps:
receiving a link quality detection instruction;
for a wireless terminal in a dormant state, under the condition that the wireless access equipment does not cache a data message to be transmitted to the wireless terminal, setting a traffic indication TIM (time value indication) domain in a beacon frame to be broadcasted according to an association identifier of the wireless terminal, wherein the TIM domain is used for notifying the wireless terminal under the condition that the wireless access equipment does not cache the data message, and actively sending the message to the wireless access equipment after awakening;
broadcasting the beacon frame according to a preset beacon period;
receiving an empty data message sent by the wireless terminal after the wireless terminal acquires the beacon frame;
and determining the link quality between the wireless terminal and the wireless terminal according to the received signal strength of the empty data message.
2. The method according to claim 1, wherein after said receiving the null data packet sent by the wireless terminal after acquiring the beacon frame, the method further comprises:
and not sending a confirmation message to the wireless terminal so that the wireless terminal resends the empty data message when the preset time is reached.
3. The method according to claim 1, wherein after said receiving the null data packet sent by the wireless terminal after acquiring the beacon frame, the method further comprises:
judging whether the rates of continuously receiving the empty data messages for multiple times are all larger than a first preset rate;
if the rates are all larger than the first preset rate, continuously and repeatedly sending null data messages to the wireless terminal according to a second preset rate, wherein the first preset rate is larger than the second preset rate;
and receiving a confirmation message fed back by the wireless terminal after the wireless terminal acquires each empty data message.
4. The method according to claim 1, wherein after said receiving the null data packet sent by the wireless terminal after acquiring the beacon frame, the method further comprises:
judging whether the rates of continuously receiving the empty data messages for multiple times are all smaller than a second preset rate;
if the rates are smaller than the second preset rate, continuously and repeatedly sending null data messages to the wireless terminal according to a first preset rate, wherein the first preset rate is larger than the second preset rate;
and receiving a confirmation message fed back by the wireless terminal after the wireless terminal acquires each empty data message.
5. The method according to claim 3 or 4, wherein the determining the link quality with the wireless terminal according to the received signal strength of the null data packet comprises:
averaging the received signal strength of each received empty data message to obtain a first received signal strength, and averaging the received signal strength of each received confirmation message to obtain a second received signal strength;
and determining the link quality between the wireless terminal and the wireless terminal according to the first received signal strength and the second received signal strength.
6. A link quality detection device applied to a wireless access device, the device comprising:
the instruction receiving module is used for receiving a link quality detection instruction;
the wireless access device comprises a setting module, a sending module and a receiving module, wherein the setting module is used for setting a traffic indication TIM (traffic indication TIM) domain in a beacon frame to be broadcasted according to an association identifier of a wireless terminal under the condition that the wireless access device is not used for caching a data message to be transmitted to the wireless terminal aiming at the wireless terminal in a dormant state, the TIM domain is used for informing the wireless terminal under the condition that the wireless access device is not used for caching the data message, and the TIM domain is used for actively sending the message to the wireless access device after awakening;
the broadcast module is used for broadcasting the beacon frame according to a preset beacon period;
the message receiving module is used for receiving the empty data message sent by the wireless terminal after the beacon frame is obtained;
and the determining module is used for determining the link quality between the wireless terminal and the wireless terminal according to the received signal strength of the empty data message.
7. The apparatus of claim 6, wherein the message receiving module is further configured to not send an acknowledgement message to the wireless terminal, so that the wireless terminal retransmits the null data message when a preset time is reached.
8. The apparatus of claim 6, further comprising:
the judging module is used for judging whether the rates of continuously and repeatedly receiving the empty data messages are all larger than a first preset rate;
a sending module, configured to send a null data packet to the wireless terminal continuously for multiple times according to a second preset rate if each rate is greater than the first preset rate, where the second preset rate is less than the first preset rate;
the message receiving module is further configured to receive a confirmation message fed back by the wireless terminal after the wireless terminal acquires each empty data message.
9. The apparatus of claim 6, further comprising:
the judging module is used for judging whether the rates of continuously receiving the empty data messages for multiple times are all less than a second preset rate;
a sending module, configured to send, according to a first preset rate, a null data packet to the wireless terminal continuously for multiple times if each rate is less than the second preset rate, where the first preset rate is greater than the second preset rate;
the message receiving module is further configured to receive a confirmation message fed back by the wireless terminal after the wireless terminal acquires each empty data message.
10. The apparatus according to claim 8 or 9, wherein the determining module is specifically configured to:
averaging the received signal strength of each received empty data message to obtain a first received signal strength, and averaging the received signal strength of each received confirmation message to obtain a second received signal strength;
and determining the link quality between the wireless terminal and the wireless terminal according to the first received signal strength and the second received signal strength.
11. A wireless access device comprising a processor and a machine-readable storage medium storing machine-executable instructions executable by the processor, the processor being caused by the machine-executable instructions to: carrying out the method steps of any one of claims 1 to 5.
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| CN113423133A (en) * | 2021-07-05 | 2021-09-21 | 苏州磐联集成电路科技股份有限公司 | Wireless data receiving method and wireless device |
| CN114302387B (en) * | 2021-12-29 | 2023-12-01 | 展讯半导体(成都)有限公司 | Signal strength determining method and related device |
| CN115914585B (en) * | 2022-11-04 | 2023-08-01 | 南京林业大学 | Comprehensive management system for broadcast television satellite transmission |
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