CN111836276A - Method and device for optimizing data transmission, wireless local area network equipment and chip - Google Patents

Method and device for optimizing data transmission, wireless local area network equipment and chip Download PDF

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Publication number
CN111836276A
CN111836276A CN201910308377.6A CN201910308377A CN111836276A CN 111836276 A CN111836276 A CN 111836276A CN 201910308377 A CN201910308377 A CN 201910308377A CN 111836276 A CN111836276 A CN 111836276A
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transmission power
ppdu
parameter
power
preamble
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CN111836276B (en
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汪明月
王军辉
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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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The application discloses a method and a device for optimizing data transmission, wireless local area network equipment and a chip, and belongs to the technical field of data transmission. The method comprises the following steps: independently determining target transmission power of a lead code in a physical layer protocol data unit (PPDU) sent by a first Access Point (AP); and adjusting the preamble transmit power of the first AP based on the target transmit power. The method and the device can realize the adjustment of the coverage area of the lead code so as to reduce the probability that the second AP and other STAs detect the lead code, and can not influence the transmission power of the PSDU by independently adjusting the transmission power of the lead code, thereby ensuring the coverage area of the PSDU and further ensuring the transmission reliability of the PPDU.

Description

Method and device for optimizing data transmission, wireless local area network equipment and chip
Technical Field
The present invention relates to the field of data transmission technologies, and in particular, to a method and an apparatus for optimizing data transmission, a wireless local area network device, and a chip.
Background
In a Wireless Local Area Network (WLAN), data transmission between an Access Point (AP) and a Station (STA) may be achieved by transmitting a physical layer protocol data unit (PPDU). The PPDU comprises: a preamble (preamble) and a physical layer service data unit (PSDU). The preamble is used for performing time-frequency synchronization, gain calibration, and the like in a data transmission process, so as to ensure that a receiving end can successfully receive a PSDU, where the PSDU is used for carrying data information to be transmitted by a physical layer.
In order to ensure effective time-frequency synchronization, the communication coverage of the preamble is usually much larger than that of the PSDU. When the coverage of the preamble of the PPDU sent by one AP is large, the preamble is easily detected by other APs and the STAs providing services thereof, and when the preamble is detected, it may be misjudged that a channel for transmitting data is occupied, thereby affecting the data transmission process of the other APs and the STAs providing services thereof.
For this reason, it is common for the AP to reduce the transmission power of the PPDU to reduce the coverage of the preamble, so that the probability of detecting the preamble by other APs and their serving STAs is reduced.
However, reducing the transmission power of the PPDU may result in a reduced quality of a signal received by a receiving end of the PPDU, which affects the transmission reliability of the PPDU.
Disclosure of Invention
The application provides a method and a device for optimizing data transmission, a wireless local area network device and a chip, which can solve the problem that the coverage of a lead code is reduced in the related technology, so that the transmission reliability of a PPDU is influenced, and the technical scheme provided by the application is as follows:
in a first aspect, the present application provides a method for optimizing data transmission, including: independently determining target transmission power of a lead code in a physical layer protocol data unit (PPDU) sent by a first Access Point (AP); the preamble transmit power of the first AP is adjusted based on the target transmit power.
Compared with the related technology, the method has the advantages that the target transmitting power is independently determined, and the lead code transmitting power of the first AP is adjusted according to the target transmitting power, so that the lead code coverage can be adjusted by adjusting the lead code transmitting power, the probability that the second AP and other STAs detect the lead code is reduced, the co-channel interference among different APs is reduced, the probability of signal blocking is further reduced, and the WLAN network capacity is favorably improved. And, through adjusting the preamble transmission power alone, will not produce the influence to PSDU's transmission power, can guarantee PSDU's coverage, and then guaranteed PPDU's transmission reliability.
In one implementation, independently determining the target transmit power of the preamble in the PPDU transmitted by the first AP may include: determining first downlink transmission power of a first AP, wherein the first downlink transmission power is required when a first station STA which is provided with services by the first AP sends PPDUs; and determining the target transmission power based on the first downlink transmission power.
The first downlink transmission power is a minimum transmission power required by the first AP when the PPDU sent by the first AP can cover the first STA, and correspondingly, in order to ensure that the preamble transmitted according to the adjusted preamble transmission power can cover the first STA, the first downlink transmission power may be regarded as a minimum value of the preamble transmission power.
Optionally, before determining the target transmit power based on the first downlink transmit power, the method further comprises: determining second downlink transmission power of a second AP, wherein the second downlink transmission power is required when the second AP sends a second PPDU to other STAs served by the second AP, and a transmission channel of the second AP is the same as that of the first AP; correspondingly, the determining the target transmission power based on the first downlink transmission power includes: and determining the target transmitting power based on the first downlink transmitting power and the second downlink transmitting power.
Since the second downlink power may be regarded as power that forms interference between the first AP and the second AP, when the target transmission power is determined according to the first downlink power and the second downlink power, in order to ensure that the preamble transmitted according to the adjusted preamble transmission power does not cause excessive interference to the OBSS, the second downlink power may be regarded as a maximum value of the preamble transmission power.
In one implementation, determining a first downlink transmit power of a first AP includes: acquiring a first parameter based on a first uplink signal sent by a first STA to a first AP, wherein the first parameter is used for reflecting the signal quality of the first uplink signal; acquiring a first coverage range of a PPDU (PPDU) sent by a first AP (access point) based on a first parameter; a first downlink transmit power is determined based on the first coverage area.
In order to ensure that the first AP can provide an effective access service for the first STA, the transmission power of the first AP needs to ensure that the coverage area transmitting PPDUs according to the transmission power can cover the first STA, and therefore, there is usually a corresponding relationship between the transmission power and the coverage area. For example, the transmit power of the first AP may be positively correlated with the coverage area. Correspondingly, the first AP may store the corresponding relationship in advance, and after determining the first coverage area, the first AP may query the corresponding relationship according to the first coverage area, and then determine the transmission power corresponding to the first coverage area as the first downlink transmission power.
In another implementation, determining a first downlink transmit power of a first AP includes: acquiring a second parameter of the reference PPDU based on a feedback signal sent by the first STA to the first AP aiming at the reference PPDU, wherein the second parameter is used for reflecting the signal quality of the reference PPDU; when the parameter value of the second parameter is within the reference parameter value range, determining the preamble transmission power in the reference PPDU as a first downlink transmission power; when the parameter value of the second parameter is not in the reference parameter value range, the second parameter updating process is repeatedly executed until the updated parameter value of the second parameter is in the reference parameter value range, and the lead code transmitting power corresponding to the updated second parameter is determined as the first downlink transmitting power;
wherein the second parameter updating process comprises: adjusting the preamble transmission power according to the reference adjustment value, transmitting a reference PPDU based on the adjusted preamble transmission power, receiving a feedback signal for the reference PPDU, and updating the second parameter based on the feedback signal.
When the parameter value of the second parameter is within the reference parameter value range, which indicates that the quality of the signal received by the first STA can meet the application requirement when the PPDU is transmitted according to the transmission power at this time, therefore, the transmission power of the preamble in the reference PPDU may be determined as the first downlink transmission power.
When the parameter value of the second parameter is not in the reference parameter value range, the signal quality of the signal received by the first STA cannot meet the application requirement, and at this time, the transmission power of the PPDU needs to be adjusted until the parameter value of the second parameter determined according to the adjusted transmission power is within the reference parameter value range. When the parameter value of the second parameter is greater than the upper limit value of the reference parameter value range, it indicates that the signal quality of the signal received by the first STA is poor, and the first STA cannot perform communication according to the signal, and at this time, the transmission power of the PPDU needs to be increased. When the parameter value of the second parameter is smaller than the lower limit value of the reference parameter value range, it indicates that the quality of the signal received by the first STA is too good, and the interference generated by the transmitted PPDU on the OBSS is large, and at this time, the transmission power of the PPDU needs to be reduced.
In an implementation manner, determining the second downlink transmission power of the second AP includes: acquiring a third parameter based on the second PPDU sent by the second AP and received by the first AP, wherein the third parameter is used for reflecting the signal quality of the second PPDU; acquiring the transmitting power of the second PPDU based on the third parameter; and determining the transmission power of the second PPDU as the second downlink transmission power.
The second downlink transmission power is transmission power required when the second AP sends the second PPDU, and the second PPDU is used for providing access service to other STAs served by the second AP. When the first AP receives the second PPDU, it may be determined that the second PPDU transmitted by the second AP can be overlaid to the first AP. Therefore, the transmission power of the second PPDU whose coverage can cover the first AP may be estimated according to the signal quality of the second PPDU received by the first AP, and the transmission power may be determined as the second downlink transmission power.
Wherein adjusting the preamble transmit power of the first AP based on the target transmit power comprises any one or more of: adjusting the transmission power of a target field in the preamble based on the target transmission power; adjusting the number of antennas used to transmit the preamble based on the target transmit power; and adjusting the frequency band for transmitting the preamble based on the target transmission power.
Since the preamble includes a plurality of fields whose transmit power determines the preamble transmit power, the transmit power of the target field in the preamble may be adjusted based on the target transmit power to achieve the adjustment of the preamble transmit power. Optionally, the target field may be one or more of the following fields: legacy short Training Field (L-STF), Legacy Long Training Field (L-LTF), and Legacy Signal Field (L-SIG).
Since the preamble is transmitted by using multiple antennas (or in multiple frequency bands), and the preamble transmission power can be regarded as the superposition of the transmission powers corresponding to the multiple antennas (or multiple frequency bands), the preamble transmission power can be greatly reduced when one antenna (or frequency band) is reduced, and therefore, the preamble transmission power can be rapidly adjusted by adjusting the number of antennas (or frequency bands) used for transmitting the preamble.
Wherein the first STA may include: at least one of the STAs served by the first AP, the preamble comprising: a preamble in a data signal transmitted by the first AP to all STAs served by the first AP.
Further, the at least one STA is a STA farthest from the first AP among STAs served by the first AP, or the at least one STA is all STAs served by the first AP.
Alternatively, the STAs served by the first AP may be divided into multiple groups of STAs, each group of STAs including at least one STA, in which case the first STA includes: any group of STAs, the preamble includes: a preamble in a data signal transmitted by the first AP to any group of STAs.
In a second aspect, the present application provides an apparatus for optimizing data transmission, comprising: a determining module, configured to independently determine a target transmit power of a preamble in a physical layer protocol data unit PPDU sent by a first access point AP; an adjusting module for adjusting a preamble transmit power of the first AP based on the target transmit power.
Optionally, the determining module includes: a first determining submodule, configured to determine a first downlink transmission power of a first AP, where the first downlink transmission power is a transmission power required by a first station STA to which the first AP provides service when sending a PPDU; and the second determining submodule is used for determining the target transmitting power based on the first downlink transmitting power.
Optionally, the first determining sub-module is further configured to determine a second downlink transmission power of the second AP, where the second downlink transmission power is a transmission power required by the second AP to send a second PPDU to another STA served by the second AP, and a transmission channel of the second PPDU sent by the second AP is the same as a transmission channel of a PPDU sent by the first AP;
correspondingly, the second determining submodule is further configured to determine the target transmit power based on the first downlink transmit power and the second downlink transmit power.
Optionally, the first determining sub-module is configured to: acquiring a first parameter based on a first uplink signal sent by a first STA to a first AP, wherein the first parameter is used for reflecting the signal quality of the first uplink signal; acquiring a first coverage range of a PPDU (PPDU) sent by a first AP (access point) based on a first parameter; a first downlink transmit power is determined based on the first coverage area.
Optionally, the first determining sub-module is configured to: acquiring a second parameter based on a feedback signal sent by the first STA to the first AP aiming at the reference PPDU, wherein the second parameter is used for reflecting the signal quality of the reference PPDU; when the parameter value of the second parameter is within the reference parameter value range, determining the preamble transmission power in the reference PPDU as a first downlink transmission power; when the parameter value of the second parameter is not in the reference parameter value range, the second parameter updating process is repeatedly executed until the updated parameter value of the second parameter is in the reference parameter value range, and the lead code transmitting power corresponding to the updated second parameter is determined as the first downlink transmitting power; wherein the second parameter updating process comprises: adjusting the preamble transmission power according to the reference adjustment value, transmitting a reference PPDU based on the adjusted preamble transmission power, receiving a feedback signal for the reference PPDU, and updating the second parameter based on the feedback signal.
Optionally, the first determining sub-module is configured to: acquiring a third parameter based on a second PPDU sent by a second AP and received by the first AP, wherein the third parameter is used for reflecting the signal quality of the second PPDU; acquiring the transmitting power of the second PPDU based on the third parameter; and determining the transmission power of the second PPDU as the second downlink transmission power.
Optionally, the adjusting module is configured to adjust the preamble transmission power of the first AP according to any one or more of the following: adjusting the transmission power of a target field in the preamble based on the target transmission power; adjusting the number of antennas used to transmit the preamble based on the target transmit power; and adjusting the frequency band for transmitting the preamble based on the target transmission power.
In a third aspect, the present application provides a wireless local area network WLAN device, including: a WLAN chip and a transceiver, the WLAN chip being configured to perform the method of optimizing data transmission of the first aspect.
In a fourth aspect, the present application provides a WLAN chip, including: a processor, a memory and an interface circuit interconnected by lines, the memory having instructions stored therein; the instructions, when executed by the processor, implement the method of optimizing data transfer of the first aspect.
In a fifth aspect, the present application provides a computer program product, which when run on an electronic device, causes the electronic device to perform the method for optimizing data transmission of any of the first aspects.
In a sixth aspect, the present application provides a storage medium having instructions that, when executed by a processor of an electronic device, enable the electronic device to perform the method of optimizing data transfer as in the first aspect.
Drawings
Fig. 1 is a schematic diagram illustrating co-channel interference between APs according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating that a coverage area of a PSDU is smaller than a coverage area of a preamble in a PPDU according to an embodiment of the present application;
fig. 3 is a schematic diagram of an implementation environment related to a method for optimizing data transmission according to an embodiment of the present application;
fig. 4 is a flowchart of a method for optimizing data transmission according to an embodiment of the present application;
fig. 5 is a flowchart for determining a first downlink transmission power of a first AP according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram illustrating a first AP providing a service to an STA according to an embodiment of the present disclosure;
fig. 7 is a flowchart for acquiring a first coverage of a PPDU transmitted by a first AP according to an embodiment of the present application;
fig. 8 is a flowchart of another method for determining a first downlink transmission power of a first AP according to an embodiment of the present disclosure;
fig. 9 is a flowchart for determining a second downlink transmission power of a second AP according to an embodiment of the present disclosure;
fig. 10 is a block diagram illustrating an apparatus for optimizing data transmission according to an embodiment of the present disclosure;
fig. 11 is a block diagram illustrating a structure of a determining module according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of a WLAN device according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
With the rapid development of the mobile internet, the user demand for mobile high-speed data access is higher and higher, and as a low-cost and high-bandwidth wireless access technology, the WLAN is deployed in a large scale and widely applied to the operator, enterprise and home markets, and plays an important role in relieving the data traffic pressure in the hot spot area.
In recent years, various powerful portable data terminals and multimedia terminals have rapidly become widespread due to a significant decrease in price. Further improvement of the WLAN standard, and improvement of a new wireless transmission technology, have greatly promoted rapid development of the WLAN. Meanwhile, with the popularization of WLANs in IEEE 802.11ac and IEEE 802.11ax, the capacity and coverage of WLAN networks have been greatly improved.
A WLAN network typically includes a plurality of APs, each of which covers STAs within a certain range and provides access services to the STAs. Each AP and its served STAs may form a Basic Service Set (BSS). The AP and STA in the basic service set may be interfered by other APs and STAs in the basic service set with the same frequency. Moreover, although adjacent APs usually adopt channels of different frequencies to communicate with STAs served by the APs, because the total number of available channels is limited, the frequency bands of the channels used by different APs still have overlapping portions, so that co-channel interference between the APs cannot be avoided. As shown in fig. 1, APs 1 to AP6 are deployed in a certain area, each AP and its served STAs form a basic service set, an AP and an STA in the basic service set where the 6 APs are located respectively use channel 1, channel 2, channel 3, channel 4 and channel 1 for signal transmission, and since the basic service set where AP1 is located and the basic service set where AP6 is located use the same channel, co-channel interference exists between the basic service sets where AP1 and AP6 are located, and the basic service set where AP3 is located and the basic service set where AP4 is located use the same channel, co-channel interference exists between the basic service sets where AP3 and AP4 are located. One of the basic service sets with the same channel may be referred to as a basic service set, and the other basic service sets may be referred to as Overlapping Basic Service Sets (OBSSs).
Moreover, when the APs in the WLAN network are densely deployed, in order to ensure effective time-frequency synchronization, the coverage of the PSDU in the PPDU sent by the AP is usually smaller than the coverage of the preamble in the PPDU, which results in easier detection of the preamble in the BSS by the AP (i.e., OBSS-AP) or the STA (i.e., OBSS-STA) within the OBSS. When the AP or STA in the OBSS detects the preamble in the BSS, it may erroneously determine that a channel for transmitting data is occupied and block transmission of data signals in the OBSS, so that transmission of data signals in the OBSS is affected. In fig. 2, the range indicated by a dotted circle a1 is the coverage of the PSDU, and the range indicated by a dotted circle a2 is the coverage of the preamble.
In order to solve the problem, the related art may reduce the transmission power of the entire PPDU to synchronously reduce the preamble transmission power, so as to reduce the coverage of the preamble, reduce the probability that the second AP and other STAs detect the preamble, further reduce transmission congestion caused by misjudgment, and reduce the influence on the data transmission process of the second AP and other STAs. However, in the related art, the transmission power of the preamble and the transmission power of the PSDU are equal to the transmission power of the PPDU, so that when the transmission power of the PPDU is reduced, the transmission power of the PSDU is also reduced, which causes a corresponding reduction in the quality of a signal received by a receiving end of the PPDU, affects the transmission reliability of the PPDU, and further affects the analysis process of the PSDU.
Alternatively, the related art may adjust a Clear Channel Assessment (CCA) threshold of the AP or the STA, so that a second AP or STA in the OBSS does not process the preamble even if the preamble in the OBSS is detected, thereby reducing the probability of blocking. The principle of processing the preamble according to the CCA threshold is as follows: after the preamble is detected, comparing the signal strength of the preamble with a CCA threshold, when the signal strength of the preamble is smaller than the CCA threshold, determining that the channel is not preempted, and still using the channel to transmit signals, and when the signal strength of the preamble is larger than or equal to the CCA threshold, determining that the channel is preempted, and not transmitting signals. However, since a large number of terminals do not support dynamic adjustment of the CCA threshold, the application range of the method for adjusting the CCA threshold is small, and the effect of reducing congestion is not obvious.
The embodiment of the application provides a method for optimizing data transmission, which can reduce the coverage area of a lead code by adjusting the lead code transmitting power of an AP (access point), so that the probability that a second AP and other STAs detect the lead code is reduced, further, the transmission blockage caused by misjudgment is reduced, and the normal transmission of data signals is ensured.
Fig. 3 is a schematic diagram of an implementation environment related to a method for optimizing data transmission according to an embodiment of the present application. As shown in fig. 3, the implementation environment may include: AP01 and at least one STA02, the AP01 being configured to provide WiFi access services to at least one STA 02.
The AP is also called a hotspot, is an access point for a mobile user to enter a wired network, and is mainly deployed in a home, a building, and a garden, and the coverage radius of the AP may be several tens of meters to hundreds of meters, or of course, the AP may also be deployed outdoors. The AP is equivalent to a bridge connecting a wired network and a wireless network, and is mainly used for connecting clients of the wireless networks together and then connecting the wireless networks into the wired network. Specifically, the AP may be a station device or a network device with a WiFi chip. Optionally, the AP may be a device supporting 802.11ax standard, and further optionally, the AP may be a device supporting multiple standards such as 802.11n, 802.11g, 802.11b, 802.11a, and 802.11 ac.
The STA may be a wireless communication chip, a wireless sensor, or a wireless communication station, such as: mobile phones, tablets, set-top boxes, smart televisions, smart wearable devices, vehicle communication devices, computers, and the like. Optionally, the STA may support an 802.11ax system, and further optionally, the STA may also support multiple systems such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.
Fig. 4 is a flowchart of a method for optimizing data transmission according to an embodiment of the present application. As shown in fig. 4, the method may include:
step 401, determining a first downlink transmission power of a first AP.
The first downlink transmission power is transmission power required when the first AP sends the PPDU to the first station STA served by the first AP. Optionally, there may be multiple implementations of determining the first downlink transmission power, and the following two implementations are exemplified in the embodiment of the present application:
in a first implementation manner of step 401, as shown in fig. 5, the process of determining the first downlink transmission power of the first AP may include the following steps:
step 4011a, obtaining a first parameter based on a first uplink signal sent by the first STA to the first AP.
Wherein the first parameter is used for reflecting the signal quality of the first uplink signal. Illustratively, the first parameter may be a signal-to-noise ratio (SNR), a Received Signal Strength Indication (RSSI), or a received power for receiving the first uplink signal.
The way to obtain SNR may be: when the first AP receives the first uplink signal, the reception power for receiving the first uplink signal and the reception power of the noise received by the first AP in the process are respectively obtained, and then the ratio of the reception power of the first uplink signal to the reception power of the noise is determined as the SNR of the first uplink signal. Wherein, a higher SNR of the first uplink signal indicates less noise received in the receiving process of the first uplink signal, i.e. indicates better signal quality of the first uplink signal.
The RSSI may be obtained by: when the first AP receives the first uplink signal sent by the STA, the first AP may determine the RSSI according to the signal power of the received first uplink signal, and a relationship between the signal power P and the RSSI is: RSSI is 10 × lg (p). Wherein, the higher the RSSI of the first uplink signal is, the better the signal quality of the first uplink signal is.
It should be noted that, the application scenarios of the method for optimizing data transmission provided in the embodiment of the present application may be various, for example: a scenario in which an AP in a BSS transmits PPDUs for all (or multiple) STAs in the BSS may be used, or a scenario in which an AP in a BSS directionally transmits PPDUs for some STAs in the BSS may be used, etc. The first AP refers to different contents according to different application scenarios.
In one implementation manner, when the application scenario is a scenario in which an AP in a BSS transmits PPDUs for all (or multiple) STAs in the BSS, the first STA may include: at least one of the STAs served by the first AP. Accordingly, the first downlink transmission power determined according to the signal transmitted by the first STA is used to adjust the transmission power of the preamble in the PPDU transmitted by the first AP to all (or a plurality of) STAs served by the first AP.
Optionally, the at least one STA included in the first STA may be a STA farthest from the first AP among all STAs served by the first AP, or the at least one STA may be multiple STAs or all STAs served by the first AP. For example, as shown in fig. 6, assume that the STA served by the first AP includes: STA1, STA2, and STA3, the first STA may be STA3 of the three STAs that is farthest from the first AP, or the first STA may be the three STAs.
In another implementation manner, when the application scenario is a scenario in which an AP in a BSS directs to transmit PPDUs to some STAs in the BSS, STAs served by the first AP may be divided into multiple groups of STAs, where each group of STAs may include at least one STA, and in this case, the first STA may include: any group of STAs. Correspondingly, the first downlink transmission power determined according to the signal sent by the first STA is used for adjusting the transmission power of the first AP to the preamble in the PPDU directionally sent by the first AP to any group of STAs.
For example, when the application scenario of the method for optimizing data transmission is a scenario in which an AP in a BSS directs to transmit PPDUs to some STAs in the BSS, as shown in fig. 6, it is assumed that STAs served by a first AP include: STA1, STA2, and STA3, the first STA may include: the STA1, in response to the first downlink transmit power determined from the signal transmitted by the first STA, is configured to adjust the transmit power of the preamble in the PPDU directed by the first AP to be transmitted to the STA 1.
Step 4012a, based on the first parameter, obtaining a first coverage area of the PPDU sent by the first AP.
Optionally, as shown in fig. 7, the implementation process of this step 4012a may include:
step 4012a1, determining the power loss in the process of sending the first uplink signal based on the first parameter.
Usually, after receiving the first uplink signal, the SNR or RSSI may be directly obtained, instead of obtaining the SNR or RSSI according to the calculation method in step 4011a, so that when the first parameter is SNR or RSSI, the received power of the first AP for receiving the first uplink signal may be obtained according to the corresponding relationship between the first parameter and the received power. And then, determining the loss power in the process of transmitting the first uplink signal according to the receiving power of the first AP and the transmitting power of the first STA. When the first parameter is the received power of the first AP for receiving the first uplink signal, the power loss may be determined directly according to the received power.
The power loss may be a difference between a received power of the first AP and a transmitted power of the first STA. And the transmission power of the first STA may be preset according to actual needs, for example, the transmission power of the STA may be preset according to a communication protocol, so that the first AP can obtain the transmission power of the STA.
Step 4012a2 determines, based on the power loss, a reception power at which the first STA receives a PPDU transmitted by the first AP.
According to the loss power and the transmission power when the first AP sends the PPDU, the receiving power when the first STA receives the PPDU can be determined. The receiving power of the first STA when receiving the PPDU may be a difference between a transmitting power of the first AP when sending the PPDU and the loss power.
Step 4012a3 determines, as the first coverage, a coverage corresponding to the received power of the first STA based on the mapping relationship between power and coverage.
The receiving power of the signal receiving end and the distance from the signal receiving end to the signal transmitting end have a positive correlation, and the positive correlation can be represented as a mapping relation between the power and the coverage of the signal transmitted by the signal transmitting end, so that after the receiving power of the first STA is obtained, the mapping relation can be inquired according to the receiving power, and then the coverage corresponding to the receiving power of the first STA is determined as the first coverage.
Alternatively, when the first STA includes a plurality of STAs, a coverage area may be determined according to each STA, and then a union of coverage areas corresponding to the plurality of STAs may be determined as the first coverage area. That is, an outermost coverage of the coverage corresponding to the plurality of STAs may be determined, and the outermost coverage may be determined as the first coverage.
Step 4013a determines a first downlink transmit power based on the first coverage area.
In order to ensure that the first AP can provide an effective access service for the first STA, the transmission power of the first AP needs to ensure that the coverage area transmitting PPDUs according to the transmission power can cover the first STA, and therefore, there is usually a corresponding relationship between the transmission power and the coverage area. For example, the transmit power of the first AP may be positively correlated with the coverage area. Correspondingly, the first AP may store the corresponding relationship in advance, and after determining the first coverage area, the first AP may query the corresponding relationship according to the first coverage area, and then determine the transmission power corresponding to the first coverage area as the first downlink transmission power.
In a second implementation manner of step 401, as shown in fig. 8, the process of determining the first downlink transmission power of the first AP may include the following steps:
step 4011b, acquiring a second parameter based on a feedback signal sent by the first STA to the first AP with respect to the reference PPDU.
Wherein the second parameter is used to reflect the signal quality of the reference PPDU. Illustratively, the second parameter may be a Packet Error Rate (PER), a Bit Error Rate (BER), or a frame error rate (fer). Wherein the lower the message transmission error rate, the better the signal quality. The lower the bit error rate, the better the signal quality. The lower the frame error rate, the better the signal quality.
The feedback signal may be an acknowledgement signal sent by the first STA after receiving the reference PPDU sent by the first AP. According to the feedback signal, the total number of reference PPDUs transmitted by the first AP and the number of bits with errors in the received signal, which are received by the first STA within a certain time, can be determined.
And the reference PPDU may be a low order Modulation and Coding Scheme (MCS) packet, and since the low order MCS packet is closer to the demodulation capability of the preamble, the second parameter is determined according to the MCS packet, and then the preamble transmission power is determined, so that the accuracy of the determined preamble transmission power can be ensured.
And 4012b, when the parameter value of the second parameter is within the reference parameter value range, determining the transmission power of the preamble in the reference PPDU as the first downlink transmission power.
When the parameter value of the second parameter is within the reference parameter value range, which indicates that the quality of the signal received by the first STA can meet the application requirement when the PPDU is transmitted according to the transmission power at this time, therefore, the transmission power of the preamble in the reference PPDU may be determined as the first downlink transmission power.
Step 4013b, when the parameter value of the second parameter is not within the reference parameter value range, repeatedly executing the second parameter updating process until the updated parameter value of the second parameter is within the reference parameter value range, and determining the preamble transmission power corresponding to the updated second parameter as the first downlink transmission power, wherein the second parameter updating process includes: adjusting the preamble transmission power according to the reference adjustment value, transmitting a reference PPDU based on the adjusted preamble transmission power, receiving a feedback signal for the reference PPDU, and updating the second parameter based on the feedback signal.
When the parameter value of the second parameter is not within the reference parameter value range, the signal quality of the signal received by the first STA cannot meet the application requirement, and since the signal synchronization process is mainly caused by a problem occurring in the signal synchronization process, and the signal synchronization process is mainly affected by the transmission power of the preamble, the transmission power of the preamble needs to be adjusted until the parameter value of the second parameter determined according to the adjusted transmission power is within the reference parameter value range. When the parameter value of the second parameter is greater than the upper limit value of the reference parameter value range, it indicates that the signal quality of the signal received by the first STA is poor, and the first STA cannot perform communication according to the signal, and at this time, the preamble transmission power needs to be increased. When the parameter value of the second parameter is smaller than the lower limit value of the reference parameter value range, it indicates that the signal quality received by the first STA is too good, and the interference generated by the transmitted PPDU on the OBSS is large, and at this time, the preamble transmission power needs to be reduced.
And, the value of the reference adjustment value can be determined according to actual needs, and in the updating process of different second parameters, the reference adjustment value can be a fixed value or a dynamic value. For example, in each second parameter updating process, the preamble transmission power may be adjusted according to the reference step size, that is, the reference adjustment value is a fixed value. And, the reference step size may be 1 decibel (dB).
By determining the first downlink transmission power according to the second parameter and determining the preamble transmission power according to the first downlink transmission power, it can be ensured that the coverage of the preamble transmitted by the preamble transmission power is enough to cover the STA served by the first AP, and the coverage is not too large, so that interference to the AP and the STA in the OBSS can be reduced.
Step 402, determining a second downlink transmission power of the second AP.
As shown in fig. 9, the implementation of this step 402 may include:
step 4021, acquiring a third parameter based on the second PPDU sent by the second AP and received by the first AP.
Wherein the third parameter is used to reflect the signal quality of the second PPDU. Illustratively, the third parameter may be SNR, RSSI, or received power used by the first AP to receive the first uplink signal. And the implementation process of this step 4021 refers to the implementation process of step 4011 a.
Step 4022, acquiring the transmission power of the second PPDU based on the third parameter, and determining the transmission power of the second PPDU as the second downlink transmission power.
The second downlink transmission power is transmission power required when the second AP sends the second PPDU, and the second PPDU is used for providing access service to other STAs served by the second AP. For example, the second PPDU may be a Beacon (Beacon) frame. When the first AP receives the second PPDU, it may be determined that the second PPDU transmitted by the second AP can be overlaid to the first AP. Therefore, the transmission power of the second PPDU whose coverage can cover the first AP may be estimated according to the signal quality of the second PPDU received by the first AP, and the transmission power may be determined as the second downlink transmission power.
The implementation process of obtaining the transmission power of the second PPDU according to the third parameter may correspondingly refer to the implementation process of determining the first downlink transmission power according to the first parameter in steps 4012a to 4013 a. And because the transmission channel of the second PPDU sent by the second AP is the same as the transmission channel of the PPDU sent by the first AP, the second AP and the first AP may be regarded as an intra-frequency AP, and intra-frequency interference exists between the second AP and the first AP, the second downlink power may be regarded as power forming interference between the second AP and the first AP. Illustratively, the second AP may be an intra-frequency AP that causes the strongest interference to the first AP.
Step 403, determining a target transmission power based on the first downlink transmission power and the second downlink transmission power.
In an implementation manner, since the first downlink transmission power is the minimum transmission power required by the first AP when the PPDU sent by the first AP can cover the first STA, in order to ensure that the preamble transmitted according to the adjusted preamble transmission power can cover the first STA, the first downlink transmission power may be regarded as the minimum value of the preamble transmission power. Thus, a target transmit power may be determined from the first downlink transmit power. For example, the first downlink transmission power may be determined as a target transmission power, or the target transmission power may be slightly larger than the first downlink transmission power. Accordingly, the step 402 may be selected not to be performed.
In another implementation manner, since the second downlink power may be regarded as a power at which interference is formed between the first AP and the second AP, when the target transmission power is determined according to the first downlink power and the second downlink power, the second downlink power may be regarded as a maximum value of the preamble transmission power, so as to ensure that the preamble transmitted according to the adjusted preamble transmission power does not cause excessive interference to the OBSS. Therefore, when determining the target transmission power, the target transmission power may be determined according to the first downlink transmission power and the second downlink transmission power.
Optionally, any transmit power within a range defined by the first downlink transmit power and the second downlink transmit power may be determined as the target transmit power. For example, the smaller of the first reference transmit power and the second reference transmit power may be determined as the target transmit power.
Moreover, since the coverage area of a signal transmitted according to a certain transmission power usually fluctuates in a small range, when determining the target transmission power, a power fluctuation threshold may be set for the first downlink transmission power, and accordingly, the first downlink transmission power P1, the second downlink transmission power P2, the power fluctuation threshold P3, and the target transmission power P0 may satisfy: p0 ═ min ((P1+ P3), P2). The value of the power fluctuation threshold may be determined according to actual needs, and may be, for example, 5 dB.
It should be noted that, the above steps 401 to 403 are implementation procedures for independently determining the target transmission power of the preamble according to the embodiment of the present application. Where "independent" means that the transmit power is determined separately and specifically for the preamble. The independent determination of the target transmit power of the preamble is achieved regardless of whether the transmit power of the PSDU is determined or regardless of the determination of the transmit power of the PSDU. In one scenario, the AP may have previously determined or configured the transmission power of the PPDU, and the legacy manner is to directly transmit the preamble and the PSDU according to the transmission power of the PPDU, that is, the legacy manner does not separately determine the preamble transmission power, but determines the transmission power of the PPDU, that is, determines the transmission power of the preamble and the PSDU at the same time. Therefore, in the technical solutions provided in the present application, "independent" may be understood as: the preamble transmission power is separately determined using the above-described implementation of steps 401 to 403, regardless of whether the transmission power of the PPDU is to be determined or configured. The method for optimizing data transmission may further include: after separately determining the preamble transmission power according to the implementation of steps 401 to 403, the preamble transmission power is determined as the transmission power of the PSDU.
Step 404, adjusting the preamble transmit power of the first AP based on the target transmit power.
The implementation manner of adjusting the preamble transmission power of the first AP may be various, and the following implementation manners are exemplified in the embodiment of the present application:
in a first implementation manner of adjusting the preamble transmission power, since the preamble includes a plurality of fields, and the transmission power of the plurality of fields determines the preamble transmission power, the transmission power of the target field in the preamble may be adjusted based on the target transmission power to achieve the adjustment of the preamble transmission power so that the preamble transmission power is close to or equal to the target transmission power.
Since each field and PSDU in the preamble has a fixed transmission time, and each field and PSDU are transmitted through a power amplifier, the gain of the power amplifier used for transmitting the target field may be adjusted during the transmission period of the target field to adjust the transmission power of the target field.
Optionally, the target field may be one or more of the following fields: legacy short Training Field (L-STF), Legacy Long Training Field (L-LTF), and Legacy Signal Field (L-SIG).
For example, when the preamble transmission power is adjusted, the transmission power of the L-STF, the L-LTF, and the L-SIG may be selected to be reduced, and the transmission power of other fields in the preamble is not adjusted, so as to ensure that the receiving end of the preamble can implement functions of Automatic Gain Control (AGC) and channel estimation according to fields such as High Throughput (HT) and Very High Throughput (VHT) in the preamble, thereby ensuring effective transmission of signals.
In a second implementation of adjusting the preamble transmit power, the number of antennas used to transmit the preamble may be adjusted based on a target transmit power such that the preamble transmit power is close to or equal to the target transmit power.
The PPDU is usually transmitted by multiple antennas, and signals transmitted by each antenna of the multiple antennas are the same, so that the greater the number of antennas used for transmitting the PPDU, the greater the transmission power of the PPDU. Accordingly, the greater the number of antennas used to transmit the preamble, the greater the preamble transmit power, and therefore, the preamble transmit power may be adjusted by adjusting the number of antennas used to transmit the preamble during the period in which the preamble is transmitted. For example, in a period in which a preamble is transmitted, when it is necessary to reduce preamble transmission power, the number of antennas used to transmit the preamble in the period may be reduced.
When the lead code is transmitted by adopting a plurality of antennas, the lead code transmitting power can be regarded as superposition of the transmitting power corresponding to the plurality of antennas, so that the lead code transmitting power can be greatly reduced when one antenna is reduced, and the lead code transmitting power can be greatly increased when one antenna is increased, so that the lead code transmitting power can be quickly adjusted when the number of the antennas for transmitting the lead code is adjusted.
In a third implementation manner of adjusting the preamble transmission power, the frequency band for transmitting the preamble may be adjusted based on the target transmission power, so that the preamble transmission power is close to or equal to the target transmission power.
Generally, PPDUs can be transmitted over multiple frequency bands, and signals transmitted over the multiple frequency bands are the same, so the more frequency bands used to transmit PPDUs, the greater the transmission power of the PPDUs. Accordingly, the larger the number of frequency bands used for transmitting the preamble, the larger the preamble transmission power, and therefore, the preamble transmission power can be adjusted by adjusting the number of frequency bands used for transmitting the preamble during the period of transmitting the preamble. For example, in a period in which a preamble is transmitted, when the preamble transmission power needs to be reduced, the number of frequency bands for transmitting the preamble in the period may be reduced.
When the preambles are transmitted on a plurality of frequency bands, the preamble transmission power can be regarded as the superposition of the transmission power on the plurality of frequency bands, so that the preamble transmission power can be greatly reduced when one frequency band is reduced, and the preamble transmission power can be greatly increased when one frequency band is increased, so that the preamble transmission power can be quickly adjusted by adjusting the number of the frequency bands for transmitting the preambles.
For example, assuming that four adjacent 20 mhz channels can be bundled together to form an 80 mhz channel before the preamble transmission power is adjusted, so that the frequency band for transmitting the preamble is an HT80 frequency band consisting of 4 identical HT20 frequency bands, when the preamble transmission power needs to be reduced, one or more of the 4 HT20 frequency bands can be reduced to achieve the effect of reducing the preamble transmission power.
It should be noted that the three above-mentioned implementations of adjusting the preamble transmission power may be used alone or in combination. For example, when the preamble transmission power needs to be greatly reduced, the transmission power of the L-STF field, the L-LTF field and the L-SIG field in the preamble may be reduced, and the number of antennas may be reduced to reduce the transmission power of the corresponding field, for example, the number of antennas used for transmitting the corresponding field may be changed from two antennas to a single antenna, and the number of antennas used for transmitting the other fields may be kept unchanged.
Moreover, the application scenarios of the method for optimizing data transmission provided by the embodiment of the present application may include, but are not limited to, the following two scenarios.
In a first application scenario, the first AP may determine a target transmission power in advance, store the target transmission power, and then perform an adjustment operation based on the stored target transmission power, so that the first AP sends the preamble according to the preamble transmission power after performing the adjustment operation in a subsequent data transmission process. For example, the first AP may determine and store the target transmission power in advance according to the above steps 401 to 403 in an initialization process after powering on, and perform an adjustment operation according to step 404 based on the stored target transmission power, so that in a subsequent PPDU transmission process, preambles are all transmitted according to the preamble transmission power after the adjustment operation is performed. For another example, after the target transmission power is determined in the initialization process, the target transmission power may be updated and stored according to actual needs in the data transmission process, and an adjustment operation is performed based on the updated target transmission power, so that the first AP transmits the preamble with the updated preamble transmission power, thereby further improving the reliability of data transmission.
The implementation process of updating the target transmission power according to the actual need may be: the target transmit power is updated at intervals, such as periodically. Alternatively, the target transmit power may be re-determined when it is determined that signal interference for data transmission according to the current preamble transmit power is large. And the operation of re-determining the target transmit power may be triggered by the first AP after the first AP determines that the signal interference is large. Or, a controller for controlling data transmission quality may be further deployed in the data transmission system where the first AP is located, and when the controller determines that the signal interference is large, the controller may instruct the first AP to re-determine the target transmission power. Alternatively, after the maintainer determines that the signal interference is large, the maintainer may instruct the first AP to re-determine the target transmission power, which is not specifically limited in the embodiment of the present application.
In a second application scenario, the first AP may determine the target transmission power in real time before transmitting the PPDU each time, and perform an adjustment operation in real time based on the target transmission power during data transmission, so that the first AP transmits the preamble according to the preamble transmission power after performing the adjustment operation.
In summary, according to the method for optimizing data transmission provided in the embodiment of the present application, the target transmission power is independently determined, and the preamble transmission power of the first AP is adjusted according to the target transmission power, compared with the related art, the method for optimizing data transmission can adjust the preamble coverage by adjusting the preamble transmission power, so as to reduce the probability that the second AP and other STAs detect the preamble, reduce the co-channel interference between different APs, further reduce the probability of signal blocking, and contribute to improving the WLAN network capacity. And, through adjusting the preamble transmission power alone, will not produce the influence to PSDU's transmission power, can guarantee PSDU's coverage, and then guaranteed PPDU's transmission reliability.
It should be noted that, the order of the steps of the method for optimizing data transmission provided in the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the situation, and any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention, and therefore, no further description is given.
The following are embodiments of an apparatus of the present application that may be used to perform embodiments of the methods of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
The embodiment of the present application provides an apparatus for optimizing data transmission, and as shown in fig. 10, the apparatus 70 may include:
a determining module 701, configured to independently determine a target transmit power of a preamble in a physical layer protocol data unit PPDU sent by a first access point AP.
An adjusting module 702 is configured to adjust a preamble transmit power of the first AP based on the target transmit power.
Alternatively, as shown in fig. 11, the determining module 701 may include:
the first determining sub-module 7011 is configured to determine a first downlink transmission power of the first AP, where the first downlink transmission power is a transmission power required when the first station STA that is served by the first AP sends a PPDU.
A second determining submodule 7012, configured to determine the target transmit power based on the first downlink transmit power.
Optionally, the first determining sub-module 7011 is further configured to determine a second downlink transmission power of the second AP, where the second downlink transmission power is a transmission power required when the second AP sends the second PPDU, and a transmission channel of the second AP is the same as a transmission channel of the first AP.
Correspondingly, the second determining sub-module 7012 is further configured to determine the target transmit power based on the first downlink transmit power and the second downlink transmit power.
Optionally, the first determining sub-module 7011 is configured to:
the method includes acquiring a first parameter based on a first uplink signal sent by a first STA to a first AP, wherein the first parameter is used for reflecting the signal quality of the first uplink signal.
Based on the first parameter, a first coverage of a PPDU transmitted by the first AP is acquired.
A first downlink transmit power is determined based on the first coverage area.
Optionally, the first determining sub-module 7011 is configured to:
and acquiring a second parameter based on a feedback signal sent by the first STA to the first AP aiming at the reference PPDU, wherein the second parameter is used for reflecting the signal quality of the reference PPDU.
And determining the transmission power of the preamble in the reference PPDU as the first downlink transmission power when the parameter value of the second parameter is within the reference parameter value range.
And when the parameter value of the second parameter is not in the reference parameter value range, the second parameter updating process is repeatedly executed until the updated parameter value of the second parameter is in the reference parameter value range, and the lead code transmitting power corresponding to the updated second parameter is determined as the first downlink transmitting power.
Wherein the second parameter updating process may include: adjusting the preamble transmission power according to the reference adjustment value, transmitting a reference PPDU based on the adjusted preamble transmission power, receiving a feedback signal for the reference PPDU, and updating the second parameter based on the feedback signal.
Optionally, the first determining sub-module 7011 is configured to:
and acquiring a third parameter based on the second PPDU sent by the second AP and received by the first AP, wherein the third parameter is used for reflecting the signal quality of the second PPDU.
And acquiring the transmission power of the second PPDU based on the third parameter.
And determining the transmission power of the second PPDU as the second downlink transmission power.
Optionally, the adjusting module 702 is configured to adjust the preamble transmission power of the first AP according to any one or more of the following: adjusting the transmission power of a target field in the preamble based on the target transmission power; adjusting the number of antennas used to transmit the preamble based on the target transmit power; and adjusting the frequency band for transmitting the preamble based on the target transmission power.
Alternatively, the means for optimizing data transmission may be deployed in the first AP. The apparatus for optimizing data transmission may further include: the device comprises a sending module and a receiving module. The transmitting module is configured to transmit a PPDU to a STA served by the first AP. The receiving module is configured to receive an uplink signal sent by an STA that is served by the first AP, or receive a second PPDU sent by a second AP.
In summary, according to the apparatus for optimizing data transmission provided in the embodiment of the present application, the determining module independently determines the target transmission power, and the adjusting module adjusts the preamble transmission power of the first AP according to the target transmission power, compared with the related art, the apparatus can adjust the preamble coverage by adjusting the preamble transmission power, so as to reduce the probability that the second AP and other STAs detect the preamble, reduce the co-channel interference between different APs, further reduce the probability of signal blocking, and contribute to improving the WLAN network capacity. And, through adjusting the preamble transmission power alone, will not produce the influence to PSDU's transmission power, can guarantee PSDU's coverage, and then guaranteed PPDU's transmission reliability.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The embodiment of the application also provides WLAN equipment. The WLAN device may include: a WLAN chip and a transceiver. The WLAN chip includes: a processor, a memory and an interface circuit interconnected by lines, the memory having instructions stored therein; when the instructions are executed by the processor, the WLAN device is configured to implement the method for optimizing data transmission provided by the above method embodiments. Alternatively, the WLAN device may be an AP.
As shown in fig. 12, the WLAN device 800 includes a processor 810, a transceiver 820, a memory 830, and interface circuitry (not shown in fig. 12). The processor 810, transceiver 820, memory 830 and interface circuits are interconnected via a bus 840.
The bus 840 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 12, but this is not intended to represent only one bus or type of bus.
Memory 830 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory 830 may also include a non-volatile memory (non-volatile) such as a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); memory 830 may also comprise a combination of the above types of memory.
The processor 810 may be a hardware chip configured to perform the functions of the WLAN device in the method for optimizing data transmission provided in the embodiments of the present application. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof. Alternatively, processor 810 may be a general-purpose processor, such as a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
Accordingly, the memory 830 is used for storing program instructions, and the processor 810 calls the program instructions stored in the memory 830 to execute one or more steps of the method for optimizing data transmission provided in the embodiment of the present application, or alternative embodiments thereof, so that the WLAN device 800 implements the functions of the above method for optimizing data transmission.
Optionally, the transceiver 820 may include an antenna. Alternatively, the transceiver 820 may also be a transceiver circuit, a radio frequency circuit, or a radio frequency unit, which is not limited in this embodiment. The transceiver 820 is used to perform a signal transceiving operation. When the processor 810 determines that a transceiving operation is required, the transceiver 820 may be invoked or driven to perform the transceiving operation. Thus, when the WLAN device 800 transceives signals, the processor 810 is configured to determine or initiate a transceiving operation, which corresponds to an initiator, and the transceiver 820 is configured to perform the transceiving operation, which corresponds to an executor. Illustratively, the transceiver 802 in the first AP is configured to transmit a PPDU to STAs served by the first AP when performing the signaling operation. When the transceiver 802 performs a signal receiving operation, the transceiver 802 is configured to receive an uplink signal transmitted by an STA served by a first AP, or receive a second PPDU transmitted by a second AP.
It should be noted that the apparatus 70 or the WLAN device 800 for optimizing data transmission in the embodiment of the present application may correspond to the first AP in the embodiment of the method provided in the present application, and operations and/or functions of each module in the apparatus 70 or each component in the WLAN device 800 for optimizing data transmission are respectively for implementing corresponding flows of each method in fig. 4 to fig. 9, and are not described herein again for brevity.
An embodiment of the present application further provides a WLAN chip, where the chip includes: a processor, a memory and an interface circuit interconnected by lines, the memory having instructions stored therein; when executed by the processor, the instructions may implement the procedures related to the first AP in the method for optimizing data transmission provided by the above method embodiments. For implementation of the processor and the memory in the WLAN chip, reference is made to the implementation in the WLAN device, which is not described herein again.
Embodiments of the present application further provide a storage medium, which may be a non-volatile computer-readable storage medium, and when instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method for optimizing data transmission provided in the embodiments of the present application.
Embodiments of the present application further provide a computer program product, which, when running on an electronic device, enables the electronic device to execute the method for optimizing data transmission provided in the embodiments of the present application.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only an example of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the principles of the present application should be included in the scope of the present application.

Claims (15)

1. A method for optimizing data transmission, comprising:
independently determining target transmission power of a lead code in a physical layer protocol data unit (PPDU) sent by a first Access Point (AP);
adjusting a preamble transmit power of the first AP based on the target transmit power.
2. The method of claim 1, wherein the independently determining the target transmit power of the preamble in the PPDU transmitted by the first AP comprises:
determining a first downlink transmission power of the first AP, wherein the first downlink transmission power is required when a first station STA which is provided with services by the first AP sends a PPDU;
determining the target transmit power based on the first downlink transmit power.
3. The method of claim 2, prior to the determining the target transmit power based on the first downlink transmit power, the method further comprising:
determining a second downlink transmission power of a second AP, wherein the second downlink transmission power is required when the second AP sends a second PPDU, and a transmission channel of the second AP is the same as a transmission channel of the first AP;
the determining the target transmit power based on the first downlink transmit power comprises:
and determining the target transmission power based on the first downlink transmission power and the second downlink transmission power.
4. The method of claim 2 or 3, wherein the determining the first downlink transmit power of the first AP comprises:
acquiring a first parameter based on a first uplink signal sent by the first STA to the first AP, wherein the first parameter is used for reflecting the signal quality of the first uplink signal;
acquiring a first coverage range of a PPDU (PPDU) sent by the first AP based on the first parameter;
determining the first downlink transmit power based on the first coverage area.
5. The method of claim 2 or 3, wherein the determining the first downlink transmit power of the first AP comprises:
acquiring a second parameter based on a feedback signal sent by the first STA to the first AP aiming at the reference PPDU, wherein the second parameter is used for reflecting the signal quality of the reference PPDU;
determining the transmission power of a preamble in the reference PPDU as the first downlink transmission power when the parameter value of the second parameter is within a reference parameter value range;
when the parameter value of the second parameter is not in the reference parameter value range, repeatedly executing a second parameter updating process until the updated parameter value of the second parameter is in the reference parameter value range, and determining the lead code transmitting power corresponding to the updated second parameter as the first downlink transmitting power;
wherein the second parameter update procedure comprises: adjusting preamble transmission power according to a reference adjustment value, transmitting a reference PPDU based on the adjusted preamble transmission power, receiving a feedback signal for the reference PPDU, and updating the second parameter based on the feedback signal.
6. The method according to any of claims 3 to 5, wherein the determining the second downlink transmission power of the second AP comprises:
acquiring a third parameter based on the second PPDU sent by the second AP and received by the first AP, wherein the third parameter is used for reflecting the signal quality of the second PPDU;
acquiring the transmission power of the second PPDU based on the third parameter;
and determining the transmission power of the second PPDU as the second downlink transmission power.
7. The method of any of claims 1 to 6, wherein the adjusting the preamble transmission power of the first AP based on the target transmission power comprises any one or more of:
adjusting a transmit power of a target field in the preamble based on the target transmit power;
adjusting a number of antennas used to transmit the preamble based on the target transmit power;
adjusting a frequency band for transmitting the preamble based on the target transmit power.
8. An apparatus for optimizing data transmission, comprising:
a determining module, configured to independently determine a target transmit power of a preamble in a physical layer protocol data unit PPDU sent by a first access point AP;
an adjusting module configured to adjust a preamble transmit power of the first AP based on the target transmit power.
9. The apparatus of claim 8, wherein the determining module comprises:
a first determining submodule, configured to determine a first downlink transmission power of the first AP, where the first downlink transmission power is a transmission power required when a first station STA that is served by the first AP sends a PPDU;
a second determining submodule, configured to determine the target transmit power based on the first downlink transmit power.
10. The apparatus according to claim 9, wherein the first determining sub-module is further configured to determine a second downlink transmit power of a second AP, where the second downlink transmit power is a transmit power required when the second AP sends a second PPDU, and a transmission channel of the second AP is the same as a transmission channel of the first AP;
the second determining submodule is further configured to determine the target transmit power based on the first downlink transmit power and the second downlink transmit power.
11. The apparatus of claim 9 or 10, wherein the first determining submodule is configured to:
acquiring a first parameter based on a first uplink signal sent by the first STA to the first AP, wherein the first parameter is used for reflecting the signal quality of the first uplink signal;
acquiring a first coverage range of a PPDU (PPDU) sent by the first AP based on the first parameter;
determining the first downlink transmit power based on the first coverage area.
12. The apparatus of claim 9 or 10, wherein the first determining submodule is configured to:
acquiring a second parameter based on a feedback signal sent by the first STA to the first AP aiming at the reference PPDU, wherein the second parameter is used for reflecting the signal quality of the reference PPDU;
determining the transmission power of a preamble in the reference PPDU as the first downlink transmission power when the parameter value of the second parameter is within a reference parameter value range;
when the parameter value of the second parameter is not in the reference parameter value range, repeatedly executing a second parameter updating process until the updated parameter value of the second parameter is in the reference parameter value range, and determining the lead code transmitting power corresponding to the updated second parameter as the first downlink transmitting power;
wherein the second parameter update procedure comprises: adjusting preamble transmission power according to a reference adjustment value, transmitting a reference PPDU based on the adjusted preamble transmission power, receiving a feedback signal for the reference PPDU, and updating the second parameter based on the feedback signal.
13. The apparatus of any one of claims 10 to 12, wherein the first determining submodule is configured to:
acquiring a third parameter based on the second PPDU sent by the second AP and received by the first AP, wherein the third parameter is used for reflecting the signal quality of the second PPDU;
acquiring the transmission power of the second PPDU based on the third parameter;
and determining the transmission power of the second PPDU as the second downlink transmission power.
14. A wireless local area network, WLAN, device, comprising: WLAN chip and transceiver, the WLAN chip being configured for performing the method of optimizing data transmission according to any of claims 1 to 7.
15. A WLAN chip, wherein the chip comprises: a processor, a memory and an interface circuit interconnected by lines, the memory having instructions stored therein; the instructions, when executed by the processor, implement the method of optimizing data transfer of any of claims 1 to 7.
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