CN115134015B - Antenna testing method and related equipment - Google Patents

Antenna testing method and related equipment Download PDF

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Publication number
CN115134015B
CN115134015B CN202110332896.3A CN202110332896A CN115134015B CN 115134015 B CN115134015 B CN 115134015B CN 202110332896 A CN202110332896 A CN 202110332896A CN 115134015 B CN115134015 B CN 115134015B
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time domain
antenna
domain symbol
ppdu
measurement result
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CN115134015A (en
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汪明月
王凡
肖峻峰
潘淳
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/15—Performance testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/29—Performance testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection

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

Abstract

An antenna test method and related device are disclosed, which are used for switching antennas in a PPDU and measuring time domain symbols in the PPDU to obtain corresponding measurement results. The method comprises the following steps: the method comprises the steps of measuring a time domain symbol before a guard interval of a first time domain symbol by a first antenna to obtain a first measurement result, starting and completing switching from the first antenna to a second antenna in the guard interval of the first time domain symbol, measuring the time domain symbol after the guard interval of the first time domain symbol by the second antenna, and obtaining a second measurement result.

Description

Antenna testing method and related equipment
Technical Field
The present application relates to the field of communications. And more particularly to an antenna testing method and related apparatus.
Background
The selection of the antenna of the wireless local area network (wireless local area network, WLAN) device has a large impact on the performance of the uplink as well as the downlink. The access point needs to test the antenna according to the received data, so as to obtain a measurement result corresponding to the antenna.
After determining the antenna to be tested, the access point sends a request message to the terminal through the antenna, and then receives the message returned by the terminal according to the antenna, so as to obtain a measurement result corresponding to the antenna. However, this method can only determine the measurement results of one set of antennas in one receiving process, and is inefficient.
Disclosure of Invention
The application provides an antenna test method and related equipment, which are used for improving the efficiency of antenna test.
The first aspect of the present application provides an antenna testing method:
the first WLAN device may receive PPDUs from one or more second WLAN devices. In the received PPDU, the first WLAN device includes a plurality of time domain symbols, including a first time domain symbol as well, and a guard interval is provided at a head of the first time domain symbol. The first WLAN device is provided with a plurality of antennas, wherein the plurality of antennas comprise a first antenna and a second antenna. The first WLAN device measures a time domain symbol preceding a guard interval of the first time domain symbol with a first antenna to obtain a first measurement result. Then, the first WLAN device starts and completes the switching from the first antenna to the second antenna within the time of the guard interval of the first time domain symbol. The first WLAN device may measure a time domain symbol after a guard interval of the first time domain symbol with the second antenna to obtain a second measurement result.
In the process of receiving the PPDU once, the first WLAN device can complete the switching of the antennas within the time of the protection interval of the first time domain symbol, and can measure the time domain symbol by using at least two antennas to obtain at least two measurement results, thereby improving the efficiency of antenna test, and reducing the influence on the service because the switching of the antennas is completed within the time of the protection interval.
In the first aspect, the first WLAN device and the second WLAN device may be Access Points (APs), the first WLAN device and the second WLAN device may also be terminals, and the time domain symbol after the guard interval of the first time domain symbol may also be the first time domain symbol itself.
In one possible implementation manner, the plurality of antennas on the first WLAN device may further include a third antenna, the PPDU received by the first WLAN device may further include a second time domain symbol, where the second time domain symbol is a time domain symbol after a time domain symbol measured by the first WLAN device with the second antenna, and during a time of a guard interval of the second time domain symbol, the first WLAN device may start and complete switching from the second antenna to the third antenna, and after the switching, the first WLAN device measures, with the third antenna, the time domain symbol after the guard interval of the second time domain symbol to obtain a third measurement result.
In the application, in the process of receiving the PPDU once, the first WLAN equipment can perform antenna switching and measurement for more times, thereby improving the flexibility of the scheme.
In one possible implementation, the PPDU received by the first WLAN device may be from a plurality of second WLAN devices, where the PPDU includes a plurality of time domain symbol groups, where the plurality of time domain symbol groups occupy different resource units respectively, and the plurality of time domain symbol groups are each from a different second WLAN device, where each of the plurality of time domain symbol groups includes the first time domain symbol described above, and the corresponding first measurement result obtained by the first WLAN device includes measurement results of time domain symbols belonging to at least two time domain symbol groups before a guard interval of the first time domain symbol.
In the application, the first WLAN device can simultaneously utilize the time domain symbol groups from a plurality of second WLAN devices to carry out antenna test, thereby further improving the efficiency of antenna test.
In one possible implementation, the first measurement may include one or more of the following: a received signal strength indication (received signal strength indication, RSSI), a signal-to-noise ratio (SNR), a signal-to-interference ratio (signal to interference ratio, SIR), a signal-to-interference-and-noise ratio (signal to interference plus noise ratio, SINR), a received signal reference power (reference signal receiving power, RSRP), a channel matrix, and a Bit Error Rate (BER), the second measurement may include one or more of: RSSI, SNR, SIR, SINR, RSRP, channel matrix and BER.
In the application, the specific forms of the first measurement result and the second measurement result are limited, and the feasibility of the scheme is improved.
In one possible implementation, the first measurement and the second measurement may be used to select a target antenna.
In the application, the specific application of the first measurement result and the second measurement result is limited, and the practicability of the scheme is improved.
The second aspect of the present application provides a first WLAN device, where the first WLAN device includes a measurement unit and a switching unit, where the measurement unit is configured to measure a time domain symbol before a guard interval of a first time domain symbol in a PPDU with a first antenna to obtain a first measurement result, where the first WLAN device includes a plurality of antennas, the plurality of antennas includes a first antenna and a second antenna, the PPDU is from one or more second WLAN devices, and the PPDU includes the first time domain symbol; the switching unit is used for starting and completing switching from the first antenna to the second antenna in the time of the guard interval of the first time domain symbol; the measurement unit is further configured to measure a time domain symbol after a guard interval of the first time domain symbol in the PPDU with the second antenna to obtain a second measurement result.
In one possible implementation, the plurality of antennas of the first WLAN device further includes a third antenna, and the PPDU further includes a second time domain symbol, the second time domain symbol being subsequent to the time domain symbol corresponding to the second measurement result. The switching unit is further configured to start and complete switching from the second antenna to the third antenna within a time of a guard interval of the second time domain symbol; the measurement unit is further configured to measure a time domain symbol after a guard interval of the second time domain symbol in the PPDU with a third antenna to obtain a third measurement result.
In one possible implementation, the PPDU is from a plurality of second WLAN devices, the PPDU includes a plurality of time domain symbol groups, the plurality of time domain symbol groups occupy different resource units, respectively, the plurality of time domain symbol groups are from the plurality of second WLAN devices, one of the plurality of time domain symbol groups includes a first time domain symbol, and the first measurement result includes measurement results of time domain symbols belonging to at least two of the plurality of time domain symbol groups before a guard interval of the first time domain symbol.
In one possible implementation, the first measurement includes one or more of the following: RSSI, SNR, SIR, SINR, RSRP, channel matrix, and BER, the second measurement comprising one or more of: RSSI, SNR, SIR, SINR, RSRP, channel matrix and BER.
In one possible implementation, the first measurement result and the second measurement result are used to select a target antenna group.
The third aspect of the present application provides a chip, the chip comprising a processing circuit and a switching circuit, wherein the processing circuit is configured to measure a time domain symbol before a guard interval of a first time domain symbol in a physical layer protocol data unit PPDU with a first antenna to obtain a first measurement result, the first WLAN device comprises a plurality of antennas, the plurality of antennas comprise a first antenna and a second antenna, the PPDU is from one or more second WLAN devices, and the PPDU comprises the first time domain symbol; the switching circuit is used for starting and completing switching from the first antenna to the second antenna in the time of the guard interval of the first time domain symbol, and the processing circuit is also used for measuring the time domain symbol after the guard interval of the first time domain symbol in the PPDU by the second antenna to obtain a second measurement result.
A fourth aspect of the application provides a first WLAN device comprising a plurality of antennas and a chip as in the third aspect, wherein the chip is adapted to perform the method of the first aspect.
Drawings
Fig. 1 is a schematic diagram of a PPDU according to an embodiment of the present application;
fig. 2 is a schematic diagram of a structure of a time domain symbol according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an antenna testing method according to an embodiment of the present application;
fig. 4a is a schematic diagram of a first WLAN device receiving a PPDU according to an embodiment of the present application;
fig. 4b is another schematic diagram of a first WLAN device receiving a PPDU according to an embodiment of the present application;
FIG. 5 is a schematic flow chart of an antenna testing method according to an embodiment of the application;
fig. 6 is a schematic diagram of a first time domain symbol in a PPDU according to an embodiment of the present application;
FIG. 7 is a schematic diagram of another embodiment of an antenna testing method;
fig. 8 is a schematic diagram of switching from the second antenna to the third antenna according to an embodiment of the present application;
FIG. 9 is a schematic diagram of another embodiment of an antenna testing method;
fig. 10 is a schematic diagram of a CTS frame according to an embodiment of the present application;
FIG. 11 is a schematic diagram of another process of the antenna testing method according to an embodiment of the application;
Fig. 12 is a schematic diagram of a TB frame according to an embodiment of the present application;
FIG. 13 is a schematic diagram of a plurality of time domain symbol groups according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of a first WLAN device according to an embodiment of the present application;
fig. 15 is a schematic diagram of another structure of the first WLAN device according to an embodiment of the present application.
Detailed Description
The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the application provides an antenna test method, which is used for switching antennas in a physical layer protocol data unit (physical layer protocol data unit, PPDU) and measuring time domain symbols in the PPDU so as to obtain corresponding measurement results and improve the efficiency of antenna test.
The protocol data unit (protocol data unit, PDU) is an information unit transmitted by a peer entity in the network, the PDU includes control information, address information or data, the PDU refers to a data unit transmitted on a designated protocol layer in the protocol system, and the PDU includes protocol control information and user information of the layer. The PDUs in the data link layer are data frames, the PDUs in the network layer are data packets, the PDUs in the transport layer are data segments, and the PDUs in the physical layer, i.e. PPDUs, are data bits. Referring to fig. 1, fig. 1 is a schematic structure diagram of a PPDU, as shown in fig. 1, the PPDU includes a plurality of time domain symbols, and referring to fig. 2, in the PPDU, a guard interval is inserted into a header of each time domain symbol, where the guard interval can be used to avoid multipath interference between the time domain symbols, and the guard interval does not carry any data, so that the antenna switching is completed within a time of the guard interval of the time domain symbol, and an influence of the antenna switching on data reception can be reduced.
Referring to fig. 3, the antenna test method according to the embodiment of the present application is based on performing antenna switching in the guard interval time of the time domain symbol in the physical layer protocol data unit (physical layer protocol data unit, PPDU), so that the time domain symbol can be measured multiple times in one PPDU by using the antenna, and a corresponding measurement result can be obtained.
Referring to fig. 4a, fig. 4a is a schematic diagram of a first WLAN device receiving a PPDU according to an embodiment of the present application, as shown in fig. 4a, the first WLAN device receives the PPDU through a first antenna and converts the PPDU into a radio frequency signal and a baseband signal, and the first WLAN device may obtain a first measurement result corresponding to measurement performed on a time domain symbol in the PPDU by the first antenna according to the radio frequency signal or the baseband signal, or may also obtain the first measurement result according to the radio frequency signal and the baseband signal, which is not limited herein. Then, in the subsequent time domain symbol, the first WLAN device completes switching from the first antenna to the second antenna within the time of the guard interval of the first time domain symbol, and measures the subsequent time domain symbol with the second antenna to obtain a second measurement result, and the first WLAN device may further confirm the first WLAN device that sends the PPDU according to the medium access control address carried in the PPDU.
Referring to fig. 4b, for example, in the first WLAN device, the first WLAN device includes a radio frequency channel 1 and a radio frequency channel 2, where the radio frequency channel 1 may be used to perform the antenna testing method of the present application, and the radio frequency channel 2 may be used to perform other services, and it is understood that in an actual implementation, the radio frequency channel 1 may include one or more radio frequency channels, and the radio frequency channel 2 may also include one or more radio frequency channels, which is not limited herein.
The above-mentioned method for testing an antenna according to the embodiment of the present application is described in more general terms, and referring to fig. 5, a flow of the method for testing an antenna according to the embodiment of the present application is described in detail below:
501. the first WLAN device measures a time domain symbol preceding a guard interval of a first time domain symbol in the PPDU with a first antenna to obtain a first measurement result.
The first WLAN device receives PPDUs from one or more second WLAN devices, where the first WLAN device has a plurality of antennas, measures one or more time domain symbols before a guard interval of a first time domain symbol in the PPDU with the first antenna after receiving the PPDUs, and obtains a first measurement result, and specifically, referring to fig. 6, the first time domain symbol may be any one time domain symbol except for a last time domain symbol and a first time domain symbol in the PPDU. It should be noted that, the first measurement result includes one or more of a received signal strength indicator (received signal strength indication, RSSI), a signal-to-noise ratio (SNR), a signal-to-interference ratio (signal to interference ratio, SIR), a signal-to-interference-plus-noise ratio (signal to interference plus noise ratio, SINR), a received signal reference power (reference signal receiving power, RSRP), a channel matrix, and a Bit Error Rate (BER), the first measurement result may include one or more measurement results corresponding to different time domain symbols, and the first WLAN device and one or more other second WLAN devices may or may not support the 802.11ax protocol, specifically, the method is not limited herein.
502. The first WLAN device starts and completes the handoff from the first antenna to the second antenna within a guard interval time of the first time domain symbol.
The first WLAN device starts and completes the switching from the first antenna to the second antenna within the guard interval time of the first time domain symbol, and it should be noted that the switching from the first antenna to the second antenna may include switching from a single antenna, or may also include switching of an antenna group, for example, including a first antenna, a fourth antenna, and a fifth antenna in the antenna group 1, and including a second antenna, a fourth antenna, and a fifth antenna in the antenna group 2, and then switching from the antenna group 1 to the antenna group 2 may also be understood as switching from the first antenna to the second antenna.
503. The first WLAN device measures time domain symbols after a guard interval of the first time domain symbol in the PPDU with a second antenna to obtain a second measurement result.
The first WLAN device measures one or more time domain symbols after a guard interval of the first time domain symbol in the PPDU with a second antenna to obtain a second measurement result. The time domain symbols after the guard interval of the first time domain symbol may also include the first time domain symbol. The second measurement may include one or more of RSSI, SNR, SINR, RSRP, a channel matrix, and BER, and the second measurement may include one or more measurements corresponding to different time domain symbols, where the first measurement and the second measurement may be used for the first WLAN device to select the target antenna, e.g., the first measurement is a signal-to-noise ratio value of 10dB, the second antenna is a signal-to-noise ratio value of 20dB, and the second antenna may be considered as the target antenna group.
In the embodiment of the application, the first WLAN device can obtain the first measurement result corresponding to the time domain symbol measured by the first antenna and the second measurement result corresponding to the time domain symbol measured by the second antenna in one PPDU, thereby improving the efficiency of antenna test.
In the above description, in the antenna test method according to the embodiment of the present application, the two antennas, namely, the first antenna and the second antenna, are used to measure the time domain symbol in one PPDU to obtain the first measurement result and the second measurement result, in practical implementation, more antennas may be switched in one PPDU, and the switched antennas are used to measure the time domain symbol to obtain the measurement result, and in particular, please refer to fig. 7, another flow of the antenna measurement method in the embodiment of the present application is described in detail below:
701. the first WLAN device measures a time domain symbol preceding a guard interval of a first time domain symbol in the PPDU with a first antenna to obtain a first measurement result.
The first WLAN device receives PPDUs from one or more second WLAN devices, where the first WLAN device has a plurality of antennas, measures one or more time domain symbols before a guard interval of a first time domain symbol in the PPDU with the first antenna after receiving the PPDUs, and obtains a first measurement result, and specifically, referring to fig. 8, the first time domain symbol may be any one time domain symbol except for a last time domain symbol in the PPDU. It should be noted that the first measurement result includes one or more of RSSI, SNR, SIR, SINR, RSRP, a channel matrix, and BER, the first measurement result may include one or more measurement results corresponding to different time domain symbols, and the first WLAN device and one or more other second WLAN devices may or may not support the 802.11ax protocol, which is not limited herein.
702. The first WLAN device starts and completes the handoff from the first antenna to the second antenna within a guard interval time of the first time domain symbol.
The first WLAN device starts and completes the switching from the first antenna to the second antenna within the guard interval time of the first time domain symbol, and it should be noted that the switching from the first antenna to the second antenna may include switching from a single antenna, or may also include switching of an antenna group, for example, including a first antenna, a fourth antenna, and a fifth antenna in the antenna group 1, and including a second antenna, a fourth antenna, and a fifth antenna in the antenna group 2, and then switching from the antenna group 1 to the antenna group 2 may also be understood as switching from the first antenna to the second antenna.
703. The first WLAN device measures time domain symbols after a guard interval of the first time domain symbol in the PPDU with a second antenna to obtain a second measurement result.
The first WLAN device measures one or more time domain symbols after the guard interval of the first time domain symbol in the PPDU with the second antenna to obtain a second measurement result, where it should be noted that the time domain symbols after the guard interval of the first time domain symbol also include the first time domain symbol, the second measurement result may include one or more of RSSI, SNR, SINR, RSRP, a channel matrix, and BER, and the second measurement result may include one or more measurement results corresponding to different time domain symbols.
704. The first WLAN device starts and completes the handoff from the second antenna to the third antenna within the time of the guard interval of the second time domain symbol.
Referring to fig. 8, the first WLAN device starts and completes the switching from the second antenna to the third antenna within the guard interval of the second time domain symbol, and it should be noted that the switching from the second antenna to the third antenna may include switching from a single antenna, or may also include switching of an antenna group, for example, including the second antenna, the fourth antenna, and the fifth antenna in the antenna group 1, and including the third antenna, the fourth antenna, and the fifth antenna in the antenna group 2, and then switching from the antenna group 1 to the antenna group 2 may also be understood as switching from the second antenna to the third antenna.
705. The first WLAN device measures time domain symbols after a guard interval of the second time domain symbol in the PPDU with a third antenna to obtain a third measurement result.
The first WLAN device measures one or more time domain symbols after a guard interval of a second time domain symbol in the PPDU with a third antenna to obtain a third measurement result, where it is to be noted that the time domain symbols after the guard interval of the second time domain symbol also include the second time domain symbol, the second measurement result may include one or more of RSSI, SNR, SINR, RSRP, a channel matrix, and BER, and the third measurement result may include one or more measurement results corresponding to different time domain symbols, where the first measurement result, the second measurement result, and the third measurement result may be used for the first WLAN device to select a target antenna, for example, the first measurement result is a signal-to-noise ratio value of 10dB, the second antenna is a signal-to-noise ratio value of 20dB, and the third measurement result is a signal-to-noise ratio value of 15dB, where the second antenna may be considered as a target antenna group.
In the embodiment of the application, besides measuring the time symbol by the first antenna group and the second antenna group and obtaining the first measurement result and the second measurement result, the time symbol can be measured by the third antenna group and a corresponding third measurement result can be obtained, and the first measurement result can be obtained. The second measurement result and the third measurement result are used for selecting the target antenna group, so that the completeness and the flexibility of the scheme are improved.
In the above description of the antenna test method in the embodiment of the present application, in an actual implementation, a first WLAN device may interact with one or more second WLAN devices through different frame sequences, so as to schedule the one or more second WLAN devices to send PPDUs to the first WLAN device, which will be described in detail below, respectively:
a Request To Send (RTS) frame and a Clear To Send (CTS) frame may be utilized to solve hidden node problems in wireless networks. When a sender needs to send data to a receiver, an RTS frame is sent first, after receiving the RTS frame, the other hosts except the receiver keep silent, after receiving the RTS frame, the receiver returns a CTS frame to the sender, after receiving the CTS frame, the hosts around the sender keep silent, after which the receiver and the sender can start to communicate.
In the embodiment of the present application, the first WLAN device may make the second WLAN device reply to the first WLAN device with a CTS frame, which is a PPDU, by sending an RTS frame to the second WLAN device, and then, the first WLAN device may acquire a measurement result according to the CTS frame, specifically, please refer to fig. 9, and another flow of the antenna test method in the embodiment of the present application is described below:
901. the first WLAN device sends an RTS frame to the second WLAN device.
The first WLAN device sends an RTS frame to the second WLAN device, where a plurality of antennas are set on the first WLAN device, and when it needs to be described, the first WLAN device and the second WLAN device may support the 802.11ax protocol or may not support the 802.11ax protocol, which is not limited herein specifically.
902. The first WLAN device receives a CTS frame from the second WLAN device.
The first WLAN device may receive a CTS frame from the second WLAN device, where the CTS frame is a PPDU, and it should be noted that, after receiving the CTS frame from the second WLAN device, the first WLAN device may first parse the CTS frame to obtain the number of time domain symbols in the CTS frame, so as to determine the number of times of measuring the time domain symbols with the antenna later.
903. The first WLAN device measures time domain symbols preceding a guard interval of a first time domain symbol in the CTS frame with a first antenna to obtain a first measurement result.
Referring to fig. 10, in the CTS frame, a plurality of time domain symbols, such as LLTF, L-SIG or Data-sym, are included, and the first WLAN device may select one of the time domain symbols as a first time domain symbol, for example, the first WLAN device may select the L-SIG as the first time domain symbol, and the first WLAN device may measure one or more time domain symbols before a guard interval of the L-SIG as the first time domain symbol by using a first antenna, and obtain a first measurement result, where the first measurement result may include one or more measurement results corresponding to different time domain symbols.
904. The first WLAN device starts and completes the handoff from the first antenna to the second antenna within the time of the guard interval of the first time domain symbol.
During the guard interval of the first time domain symbol, the first WLAN device starts and completes the switching from the first antenna to the second antenna, and it should be noted that the switching from the first antenna to the second antenna may include switching from a single antenna, or may also include switching of an antenna group, for example, the antenna group 1 includes the first antenna, the fourth antenna, and the fifth antenna, and the antenna group 2 includes the second antenna, the fourth antenna, and the fifth antenna, and then switching from the antenna group 1 to the antenna group 2 may also be understood as switching from the first antenna to the second antenna.
905. The first WLAN device measures a time domain symbol after a guard interval of the first time domain symbol with a second antenna to obtain a second measurement result.
The first WLAN device may measure one or more time domain symbols after a guard interval of the first time domain symbol with the second antenna and obtain a second measurement result, where the second measurement result may include one or more measurement results corresponding to different time domain symbols. It should be noted that, the time domain symbol after the guard interval of the first time domain symbol also includes the first time domain symbol, taking the first time domain symbol as an L-SIG as an example, after the first WLAN device switches to the second antenna in the time of the guard interval of the time domain symbol of the L-SIG, the L-SIG may be measured by the second antenna, or the time domain symbol after the L-SIG may also be measured by the second antenna, or both may be measured, so as to obtain the second measurement result.
906. The first WLAN device starts and completes the handoff from the second antenna to the third antenna within the time of the guard interval of the second time domain symbol.
The first WLAN device may continue to switch antennas, the first WLAN device may start and complete switching from the second antenna to the third antenna within a time of a guard interval of a second time domain symbol after the first time domain symbol, for example, the first WLAN device may use the time domain symbol Data-sym as the second time domain symbol, the first WLAN device may switch to the third antenna within the time of the guard interval Data-sym, where it is noted that switching from the second antenna to the third antenna may include switching from a single antenna, or may also include switching from an antenna group, for example, including the second antenna, the fourth antenna, and the fifth antenna in the antenna group 1, and including the third antenna, the fourth antenna, and the fifth antenna in the antenna group 2, and switching from the antenna group 1 to the antenna group 2 may also be understood as switching from the second antenna to the third antenna.
907. The first WLAN device measures a time domain symbol after a guard interval of the second time domain symbol with a third antenna to obtain a third measurement result.
The first WLAN device measures one or more time domain symbols after the guard interval of the second time domain symbol with the third antenna, that is, measures one or more time domain symbols after the guard interval of the Data-sym, and obtains a third measurement result, where the third measurement result may include one or more measurement results corresponding to different time domain symbols, where the first measurement result, the second measurement result, and the third measurement result may be used for the first WLAN device to select the target antenna, for example, the first measurement result is a signal-to-noise ratio value of 10dB, the second antenna is a signal-to-noise ratio value of 20dB, and the third measurement result is a signal-to-noise ratio value of 15dB, where it may be considered that the second antenna is a target antenna group.
In the above description, the first WLAN device interacts with the second WLAN device through the RTS frame and the CTS frame, and uses different antennas to measure the time domain symbols in the CTS frame, and in another implementation, the first WLAN device may also interact with the second WLAN device through the Trigger frame and the TB frame, and uses the antennas to measure the time domain symbols in the TB frame sent by the second WLAN device, so as to obtain a measurement result. The Trigger frame and the TB frame can be applied to an uplink multi-user multiple-input multiple-output transmission scene, and because the multi-user uplink has higher requirements on the transmission power and the transmission capability of the terminal, the first WLAN device will first send the Trigger frame to the second WLAN device, the Trigger frame will declare the requirement of the second WLAN device for the PPDU replied to the first WLAN device, the second WLAN device will reply the TB frame to the first WLAN device after receiving the Trigger frame, the TB frame is a PPDU, and the PPDU needs to conform to the requirement of the terminal declared in the Trigger frame for replying to the PPDU of the first WLAN device.
Referring to fig. 11, another flow of the antenna testing method according to the embodiment of the application is described below:
1101. the first WLAN device sends a Trigger frame to the second WLAN device.
The first WLAN device sends a Trigger frame to the second WLAN device, where the Trigger frame includes indication information of the number of time domain symbols that the second WLAN device needs to reply to the TB frame of the first WLAN device, so that the first WLAN device may determine in advance the number of times that the time domain symbols in the TB frame are measured with the antenna. The plurality of antennas are disposed on the first WLAN device, and the first WLAN device and the second WLAN device may support the 802.11ax protocol or may not support the 802.11ax protocol, which is not limited herein.
1102. The first WLAN device receives a TB frame from the second WLAN device.
After sending the Trigger frame to the second WLAN device, the access point may receive a TB frame from the second WLAN device, where the TB frame is a PPDU.
1103. The first WLAN device measures time domain symbols preceding a guard interval of a first time domain symbol in the TB frame with a first antenna to obtain a first measurement result.
Referring to fig. 12, in a TB frame, a plurality of time domain symbols, such as LLTF, L-SIG or RL-SIG, are included, an AP may select one of the time domain symbols as a first time domain symbol, for example, a first WLAN device may select the time domain symbol of LLTF as the first time domain symbol, and the first WLAN device measures one or more time domain symbols before a guard interval of the time domain symbol of LLTF with a first antenna, and obtains a first measurement result, where the first measurement result may include one or more measurement results corresponding to different time domain symbols.
1104. The first WLAN device starts and completes the handoff from the first antenna to the second antenna within the time of the guard interval of the first time domain symbol.
The first WLAN device starts and completes the switching from the first antenna to the second antenna within the guard interval of the first time domain symbol, and the switching from the first antenna to the second antenna may include the switching of a single antenna, or may also include the switching of an antenna group, for example, the antenna group 1 includes the first antenna, the fourth antenna, and the fifth antenna, and the antenna group 2 includes the second antenna, the fourth antenna, and the fifth antenna, and then the switching from the antenna group 1 to the antenna group 2 may also be understood as the switching from the first antenna to the second antenna.
1105. The first WLAN device measures a time domain symbol after a guard interval of the first time domain symbol with a second antenna to obtain a second measurement result.
The first WLAN device may measure one or more time domain symbols after a guard interval of the first time domain symbol with the second antenna and obtain a second measurement result, where the second measurement result may include one or more measurement results corresponding to different time domain symbols. It should be noted that, the time domain symbol after the guard interval of the first time domain symbol also includes the first time domain symbol, taking the first time domain symbol as an L-SIG as an example, after the first WLAN device switches to the second antenna in the time of the guard interval of the time domain symbol of the L-SIG, the L-SIG may be measured by the second antenna, or the time domain symbol after the L-SIG may also be measured by the second antenna, or both may be measured, so as to obtain the second measurement result.
1106. The first WLAN device starts and completes the handoff from the second antenna to the third antenna within the time of the guard interval of the second time domain symbol.
The first WLAN device may continue the switching of the antennas, the first WLAN device may start and complete the switching from the second antenna to the third antenna within a time of a guard interval of a second time domain symbol after the first time domain symbol, for example, the first WLAN device may use the time domain symbol of SIGA2 as the second time domain symbol, the first WLAN device may switch to the third antenna within the time of the guard interval of SIGA2, the switching from the first antenna to the second antenna may include a switching of a single antenna, or may also include a switching of an antenna group, for example, the antenna group 1 includes the second antenna, the fourth antenna, and the fifth antenna, and the antenna group 2 includes the third antenna, the fourth antenna, and the fifth antenna, and then the switching from the antenna group 1 to the antenna group 2 may also be understood as switching from the second antenna to the third antenna.
1107. The first WLAN device measures a time domain symbol after a guard interval of the second time domain symbol with a third antenna to obtain a third measurement result.
The first WLAN device measures one or more time domain symbols after the guard interval of the second time domain symbol with the third antenna, that is, measures one or more time domain symbols after the guard interval of the Data-sym, and obtains a third measurement result, where the third measurement result may include one or more measurement results corresponding to different time domain symbols, where the first measurement result, the second measurement result, and the third measurement result may be used for the first WLAN device to select the target antenna, for example, the first measurement result is a signal-to-noise ratio value of 10dB, the second measurement result is a signal-to-noise ratio value of 20dB, and the third measurement result is a signal-to-noise ratio value of 15dB, which may be considered as the target antenna group.
It should be noted that, in addition to the frame combination of the RTS frame and the CTS frame, and the frame combination of the Trigger frame and the TB frame, the antenna test method according to the embodiments of the present application may be executed according to an ACK frame, an NDPA sounding frame, an ERSU frame, or a Midamble frame.
In another implementation, on the basis of the antenna test method shown in fig. 11, the first WLAN device may schedule multiple second WLAN devices through the Trigger frame at the same time, and in the case that the first WLAN device schedules multiple second WLAN devices through the Trigger frame at the same time, please refer to fig. 13, the TB frame received by the first WLAN device includes multiple time-domain symbol groups, where each time-domain symbol group occupies a different resource unit, each time-domain symbol group includes multiple time-domain symbols, and each time-domain symbol group includes a first time-domain symbol, and each time-domain symbol group is from the multiple second WLAN devices, which needs to be described that, in this implementation, the first WLAN device and the other multiple second WLAN devices all need to support the 802.11ax protocol.
The first WLAN device may complete switching from the first antenna to the second antenna within a time of a guard interval of a first time domain symbol of each time domain symbol group at the same time, and measure, with the first antenna, time domain symbols of at least two time domain symbol groups among the plurality of time domain symbol groups that precede the guard interval of the first time domain symbol to obtain a first measurement result, where the first measurement result includes measurement results of time domain symbols of at least two time domain symbol groups among the plurality of time domain symbol groups, and measure, with the second antenna, time domain symbols of at least two time domain symbol groups among the plurality of time domain symbol groups that follow the guard interval of the first time domain symbol to obtain a second measurement result, where the second measurement result includes measurement results of time domain symbols of at least two time domain symbol groups among the plurality of time domain symbol groups. For example, for the time domain symbol group 1 and the time domain symbol group 2, the first antenna may be used to measure the time domain symbol before the guard interval of the first time domain symbol to obtain a first measurement result, and the second antenna may be used to measure the time domain symbol after the guard interval of the first time domain symbol to obtain a second measurement result, where the first measurement result includes the first measurement result corresponding to the time domain symbol group 1 and the first measurement result corresponding to the time domain symbol group 2, and the second measurement result includes the second measurement result corresponding to the time domain symbol group 1 and the second measurement result corresponding to the time domain symbol group 2.
It can be understood that the first WLAN device may also continue to perform antenna switching and measure the subsequent time domain symbols with the switched antenna, and the specific implementation manner is similar to the method in the embodiment shown in fig. 11 and will not be repeated here.
In the embodiment of the application, the first WLAN device can simultaneously utilize a plurality of second WLAN devices to perform antenna test, thereby improving the efficiency of antenna test.
The method for testing an antenna in the embodiment of the present application is described above, and the description of the first WLAN device in the embodiment of the present application is started below:
referring to fig. 14, a first WLAN device 1400 in an embodiment of the present application includes a measurement unit 1401 and a switching unit 1402.
And a measurement unit 1401 for measuring a time domain symbol before a guard interval of a first time domain symbol in the PPDU with a first antenna to obtain a first measurement result, wherein the first WLAN device includes a plurality of antennas, the plurality of antennas includes a first antenna and a second antenna, the PPDU is from one or more second WLAN devices, and the PPDU includes the first time domain symbol.
A switching unit 1402, configured to start and complete switching from the first antenna to the second antenna within a time of a guard interval of the first time domain symbol.
The measurement unit 1401 is further configured to measure a time domain symbol after a guard interval of the first time domain symbol in the PPDU with the second antenna to obtain a second measurement result.
When a third antenna is included on the plurality of antennas of the first WLAN device,
the switching unit 1402 is further configured to start and complete switching from the second antenna to the third antenna within a time of a guard interval of the second time domain symbol.
The measurement unit 1401 is further configured to measure a time domain symbol after a guard interval of the second time domain symbol in the PPDU with a third antenna to obtain a third measurement result.
It should be noted that the PPDU may be from a plurality of second WLAN devices, where the PPDU includes a plurality of time domain symbol groups, where the plurality of time domain symbol groups occupy different resource units, respectively, and the plurality of time domain symbol groups are from a plurality of first WLAN devices, where one time domain symbol group of the plurality of time domain symbol groups includes a first time domain symbol, and the first measurement result includes measurement results of time domain symbols belonging to at least two time domain symbol groups of the plurality of time domain symbol groups before a guard interval of the first time domain symbol.
The first measurement and the second measurement may include one or more of the following: RSSI, SNR, SIR, SINR, RSRP, channel matrix, BER.
The embodiment of the application also provides a chip, which comprises a processing circuit and a switching circuit, wherein the processing circuit is used for measuring a time domain symbol before a protection interval of a first time domain symbol in a PPDU by using a first antenna to obtain a first measurement result, the first WLAN device comprises a plurality of antennas, the plurality of antennas comprise a first antenna and a second antenna, the PPDU is from one or a plurality of second WLAN devices, and the PPDU comprises the first time domain symbol; the switching circuit is used for starting and completing switching from the first antenna to the second antenna in the time of the guard interval of the first time domain symbol; the processing circuit is further configured to measure a time domain symbol after a guard interval of the first time domain symbol in the PPDU with the second antenna to obtain a second measurement result. The chip may be used to perform the operations of the first WLAN device in the embodiments shown in fig. 3, fig. 4a, fig. 4b, fig. 5, fig. 7, fig. 8, fig. 9, fig. 11, and fig. 13, and it is understood that the chip may be one chip, that is, the processing circuit and the switching circuit are integrated on one chip, or the chip may also include a plurality of chips, that is, the processing circuit and the switching circuit are respectively located on a plurality of chips, which is not limited herein.
Fig. 15 is a schematic structural diagram of a first WLAN device according to an embodiment of the present application, where the first WLAN device includes a plurality of antennas and the chip described above, where the plurality of antennas may be used to implement reception of PPDUs from a second WLAN device, and the chip may be used to implement antenna switching during a guard interval of a time domain symbol and processing of PPDUs received by the antennas, and the first WLAN device may perform operations of the first WLAN device in the embodiments shown in fig. 3, fig. 4a, fig. 4b, fig. 5, fig. 7, fig. 8, fig. 9, fig. 11, and fig. 13, which are not described herein again.
It should be noted that, in another implementation, the functions performed by the chip in the first WLAN device shown in fig. 15 may also be implemented by a corresponding circuit in the first WLAN device, and need not be implemented by the chip.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
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 on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

Claims (8)

1. An antenna testing method, comprising:
a first Wireless Local Area Network (WLAN) device measures time domain symbols before a guard interval of a first time domain symbol in a physical layer protocol data unit (PPDU) by using a first antenna to obtain a first measurement result, wherein the first WLAN device comprises a plurality of antennas, the plurality of antennas comprise the first antenna and a second antenna, the PPDU is from a plurality of second WLAN devices, and the PPDU comprises the first time domain symbol; the PPDU includes a plurality of time domain symbol groups respectively occupying different resource units, the plurality of time domain symbol groups respectively being from the plurality of second WLAN devices, one of the plurality of time domain symbol groups including the first time domain symbol, the first measurement result including measurement results of time domain symbols belonging to at least two of the plurality of time domain symbol groups before a guard interval of the first time domain symbol;
The first WLAN device starts and completes switching from the first antenna to the second antenna in the time of the guard interval of the first time domain symbol;
the first WLAN device measures a time domain symbol after a guard interval of the first time domain symbol in the PPDU by using the second antenna to obtain a second measurement result, wherein the first measurement result and the second measurement result are used for the first WLAN device to select a target antenna; the time domain symbols after the guard interval of the first time domain symbol include the first time domain symbol;
wherein a host surrounding the first WLAN device except the plurality of second WLAN devices maintains a silent state after receiving the PPDU.
2. The method of claim 1, wherein the plurality of antennas further comprises a third antenna, wherein the PPDU further comprises a second time domain symbol, wherein the second time domain symbol follows a time domain symbol corresponding to the second measurement,
the method further comprises the steps of:
the first WLAN device starts and completes switching from the second antenna to the third antenna within a time of a guard interval of the second time domain symbol;
the first WLAN device measures a time domain symbol after a guard interval of the second time domain symbol in the PPDU with the third antenna to obtain a third measurement result.
3. The method of any one of claims 1 to 2, wherein the first measurement comprises one or more of: received signal strength indication, RSSI, signal to noise ratio, SNR, signal to interference ratio, SINR, received signal reference power, RSRP, channel matrix, bit error rate, BER;
the second measurement includes one or more of: RSSI, SNR, SIR, SINR, RSRP, channel matrix, BER.
4. A first wireless local area network, WLAN, device, comprising:
a measurement unit configured to measure a time domain symbol before a guard interval of a first time domain symbol in a physical layer protocol data unit PPDU with a first antenna to obtain a first measurement result, where the first WLAN device includes a plurality of antennas, the plurality of antennas including the first antenna and a second antenna, the PPDU is from a plurality of second WLAN devices, and the PPDU includes the first time domain symbol; the PPDU includes a plurality of time domain symbol groups respectively occupying different resource units, the plurality of time domain symbol groups respectively being from the plurality of second WLAN devices, one of the plurality of time domain symbol groups including the first time domain symbol, the first measurement result including measurement results of time domain symbols belonging to at least two of the plurality of time domain symbol groups before a guard interval of the first time domain symbol;
A switching unit, configured to start and complete switching from the first antenna to the second antenna within a time of a guard interval of the first time domain symbol;
the measurement unit is further configured to measure a time domain symbol after a guard interval of the first time domain symbol in the PPDU with the second antenna to obtain a second measurement result, where the first measurement result and the second measurement result are used by the first WLAN device to select a target antenna; the time domain symbols after the guard interval of the first time domain symbol include the first time domain symbol; wherein a host surrounding the first WLAN device except the plurality of second WLAN devices maintains a silent state after receiving the PPDU.
5. The first WLAN device of claim 4, wherein the plurality of antennas further comprises a third antenna, the PPDU further comprises a second time domain symbol, the second time domain symbol being subsequent to a time domain symbol corresponding to the second measurement result;
the switching unit is further configured to start and complete switching from the second antenna to the third antenna within a time of a guard interval of the second time domain symbol;
and the measurement unit is further configured to measure a time domain symbol after a guard interval of the second time domain symbol in the PPDU by using the third antenna, so as to obtain a third measurement result.
6. The first WLAN device of any of claims 4 to 5, wherein the first measurement result comprises one or more of: received signal strength indication, RSSI, signal to noise ratio, SNR, signal to interference ratio, SINR, received signal reference power, RSRP, channel matrix, bit error rate, BER;
the second measurement includes one or more of: RSSI, SNR, SIR, SINR, RSRP, channel matrix, BER.
7. A chip, wherein the chip comprises a processing circuit and a switching circuit;
the processing circuit is configured to measure a time domain symbol before a guard interval of a first time domain symbol in a physical layer protocol data unit PPDU with a first antenna to obtain a first measurement result, where the first WLAN device includes a plurality of antennas, the plurality of antennas includes the first antenna and a second antenna, the PPDU is from a plurality of second WLAN devices, and the PPDU includes the first time domain symbol; the PPDU includes a plurality of time domain symbol groups respectively occupying different resource units, the plurality of time domain symbol groups respectively being from the plurality of second WLAN devices, one of the plurality of time domain symbol groups including the first time domain symbol, the first measurement result including measurement results of time domain symbols belonging to at least two of the plurality of time domain symbol groups before a guard interval of the first time domain symbol;
The switching circuit is used for starting and completing switching from the first antenna to the second antenna in the time of the guard interval of the first time domain symbol;
the processing circuit is further configured to measure a time domain symbol after a guard interval of the first time domain symbol in the PPDU with the second antenna to obtain a second measurement result, where the first measurement result and the second measurement result are used by the first WLAN device to select a target antenna; the time domain symbols after the guard interval of the first time domain symbol include the first time domain symbol; wherein a host surrounding the first WLAN device except the plurality of second WLAN devices maintains a silent state after receiving the PPDU.
8. A first wireless local area network, WLAN, device comprising a plurality of antennas and a chip as claimed in claim 7 for performing the method as claimed in any of claims 1 to 3.
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