WO2016197379A1

WO2016197379A1 - Power control method and relevant device

Info

Publication number: WO2016197379A1
Application number: PCT/CN2015/081300
Authority: WO
Inventors: 刘亚林; 张佳胤; 罗俊; 庞继勇
Original assignee: 华为技术有限公司
Priority date: 2015-06-12
Filing date: 2015-06-12
Publication date: 2016-12-15
Also published as: CN107534931B; CN107534931A

Abstract

Provided are a power control method and a relevant device. The method comprises: an access point (AP) determining information about an expected receiving power when a plurality of stations (STAs) send uplink information to the AP on the same time and frequency resource; and the AP sending the information about the expected receiving power to the plurality of STAs, so that each STA of the plurality of STAs determines a sending power according to the expected receiving power. The technical solution can ensure that an AP uses the same or similar receiving power to receive uplink information sent by different STAs.

Description

Method of controlling power and related equipment

Technical field

Embodiments of the present invention relate to the field of communication technologies, and, more particularly, to a method and related apparatus for controlling power.

Background technique

In order to meet the needs of users, the transmission of the site (English: Station, abbreviation: STA) to the access point (English: Access Point, abbreviation: AP) can not only carry out single-point to single-point transmission, but also multi-point to single-point transmission. Transmission. Single-point and single-point transmission means that the same channel or the same frequency band at the same time can only communicate with one STA by the AP. Multi-point and single-point transmission means that the same channel or the same frequency band AP can communicate with multiple STAs at the same time. In multi-point to single-point uplink transmission, the AP simultaneously receives uplink information transmitted from multiple sites. In order for the AP to better demodulate the received uplink information, the AP needs to receive the uplink information sent by each STA by using the same or similar power. However, the environments in which the STAs of the multiple STAs are located may be different, and the characteristics of the different STAs may be different. Therefore, the AP needs to indicate the sending power of each STA to ensure that the AP uses the uplink information when it reaches the AP. The receiving power is the same. However, the AP needs to indicate the transmission power to each STA, which makes the signaling overhead too large. At the same time, the AP may not be able to determine the environment in which each STA is located. Therefore, the AP may not be able to accurately calculate the transmit power that each STA needs to use. In this case, it may not be guaranteed that the AP receives the uplink information sent by each STA using the same or similar power.

Summary of the invention

The embodiment of the invention provides a method for controlling power and related devices, which can ensure that the AP receives the uplink information sent by different STAs by using the same or similar received power.

In a first aspect, an embodiment of the present invention provides a method for controlling power, where the method includes: determining, by an access point AP, information of a desired received power when a plurality of station STAs send uplink information to the AP on the same time-frequency resource; The AP transmits the information of the expected received power to the plurality of STAs, so that each of the plurality of STAs determines the transmit power according to the expected received power.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the AP sends the information about the expected received power to the multiple STAs, including: the AP uses a signaling domain in a downlink transmission frame. The public part transmits the information of the desired received power to the plurality of STAs.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the common part of the signaling domain in the downlink transmission frame is any one of the following: an effective signaling domain The common part of B media access control MAC layer, the common part physical layer of efficient signaling domain B and the common part physical layer of efficient signaling domain A.

With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a third possible implementation manner of the foregoing aspect, the AP determines that the multiple site STAs send the AP to the AP on the same time-frequency resource. The information about the expected received power when the uplink information is included includes: determining, by the AP, information about the expected received power according to a path loss of each STA of the plurality of STAs to the AP.

With reference to the first aspect, or any one of the foregoing possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, the method further includes: receiving, by the AP, each STA of the multiple STAs Channel state information CSI; the AP determines resource allocation information of each of the plurality of STAs according to the CSI and the expected received power reported by each of the plurality of STAs, where the resource allocation information includes: a resource unit The number, the modulation and coding scheme, and the space-time stream number; the AP sends the determined resource allocation information of each of the plurality of STAs to each of the plurality of STAs, so that the plurality of STAs Each STA transmits a data packet according to the determined resource allocation information.

With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the information about the expected received power is one of the following information: a value of the expected received power It is desirable to receive the power spectral density and the desired received power of each of the resource elements in the time-frequency resource.

With reference to the first aspect or any one of the possible possible implementations of the first possible implementation to the fourth possible implementation, in a sixth possible implementation manner of the first aspect, Before the AP determines the information of the expected received power when the multiple station STAs send the uplink information to the AP on the same time-frequency resource, the method further includes: the AP broadcasting the reference received power to all STAs in the service range; the AP determines The information about the expected received power when the multiple station STAs send the uplink information to the AP on the same time-frequency resource, including: the AP determines the expected received power; the AP determines the difference between the expected received power and the reference received power The AP determines the information of the expected received power as the difference between the expected received power and the reference received power.

With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the method further includes: the AP adjusts according to the expected received power Time and space frequency domain resources.

In a second aspect, the embodiment of the present invention provides a method for controlling power, where the method includes: receiving, by a first station STA, information about a desired received power sent by the AP, where the first STA is on the same time-frequency resource and accessing One of the plurality of STAs that the AP performs communication; the first STA determines the transmission power according to the information of the expected received power; the first STA transmits the target information using the transmission power.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the information that the first STA receives the expected received power that is sent by the AP includes: the public information of the signaling domain in the downlink transmission frame of the first STA Partially receiving information of the expected received power transmitted by the AP.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the common part of the signaling domain in the downlink transmission frame is any one of the following: an effective signaling domain The common part of B media access control MAC layer, the common part physical layer of efficient signaling domain B and the common part physical layer of efficient signaling domain A.

With the second aspect or any one of the foregoing possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect, the method further includes: the first STA sending the channel state information CSI to the AP; The first STA receives the resource allocation information sent by the AP, where the expected resource allocation information includes: a number of resource units, a desired modulation and coding scheme, and a desired space-time stream number; the first STA generates the target information according to the resource allocation information. .

With reference to the second aspect or any one of the foregoing possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the information about the expected received power is one of the following information: the value of the expected received power It is desirable to receive the power spectral density and the desired received power of each of the resource elements in the time-frequency resource.

With reference to the second aspect or the first possible implementation of the second aspect to any one of the third possible implementation manners, in the fifth possible implementation manner of the second aspect, Before the first STA receives the information about the expected received power sent by the AP, the method further includes: the first STA receiving the reference received power of the AP broadcast; the first STA determining the transmit power according to the information about the expected received power, including The first STA determines the expected received power according to the reference received power and the expected received power, and determines the transmit power according to the expected received power, where the information of the expected received power is the expected received power and the reference received The difference in power.

In combination with the second aspect or any of the above possible implementations of the second aspect, in the second aspect In a sixth possible implementation, the method further includes: the first STA acquires a transmit power of the AP that is carried by the AP when the beacon frame is sent, and detects a received signal strength indicator RSSI in the beacon frame; The transmit power and the RSSI determine the path loss between the first STA and the AP.

In a third aspect, an embodiment of the present invention provides an access point AP, where the AP includes: a determining unit, configured to determine information about expected received power when multiple station STAs send uplink information to the AP on the same time-frequency resource. And a sending unit, configured to send the information of the expected received power to the multiple STAs, so that each of the multiple STAs determines the transmit power according to the expected received power.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the sending unit is configured to send the information about the expected received power to the multiple STAs by using a common part of the signaling domain in the downlink transmission frame.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the common part of the signaling domain in the downlink transmission frame is any one of the following: an effective signaling domain The common part of B media access control MAC layer, the common part physical layer of efficient signaling domain B and the common part physical layer of efficient signaling domain A.

With reference to the third aspect or any one of the foregoing possible implementation manners of the third aspect, in a third possible implementation manner of the third aspect, the determining unit is specifically configured to be used according to each of the multiple STAs The path loss to the AP determines the information of the expected received power.

With reference to the third aspect or any one of the foregoing possible implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect, the AP further includes: a receiving unit, configured to receive each of the multiple STAs The channel state information CSI reported by the STAs; the determining unit is further configured to determine resource allocation information of each of the plurality of STAs according to the CSI reported by each STA of the plurality of STAs and the expected received power, The resource allocation information includes: a number of resource units, a modulation and coding scheme, and a space-time stream number; the sending unit is further configured to send the determined resource allocation information of each of the plurality of STAs to the multiple STAs Each of the STAs, so that each of the plurality of STAs transmits a data packet according to the determined resource allocation information.

With reference to the third aspect or any one of the foregoing possible implementation manners of the third aspect, in the fifth possible implementation manner of the third aspect, the information about the expected received power is one of the following information: the value of the expected received power It is desirable to receive the power spectral density and the desired received power of each of the resource elements in the time-frequency resource.

With reference to the third aspect or the first possible implementation of the third aspect to any possible implementation of the fourth possible implementation, the sixth possible implementation manner of the third aspect The sending unit is further configured to broadcast the reference receiving power to all the STAs in the service range; the determining unit is specifically configured to determine the expected received power, determine a difference between the expected received power and the reference received power, and determine the The information of the expected received power is the difference between the expected received power and the reference received power.

With reference to the third aspect or any one of the foregoing possible implementation manners of the third aspect, in a seventh possible implementation manner of the third aspect, the determining unit is further configured to schedule a space-time frequency domain according to the expected received power Resources.

In a fourth aspect, the embodiment of the present invention provides a STA that is one of a plurality of STAs that communicate with an access point AP on the same time-frequency resource, and the STA includes: a receiving unit, configured to receive The information about the expected received power sent by the AP; the determining unit, configured to determine the transmit power according to the information about the expected received power; and the sending unit, configured to send the target information by using the transmit power.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the receiving unit is configured to receive information about the expected received power sent by the AP from a common part of the signaling domain in the downlink transmission frame.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the common part of the signaling domain in the downlink transmission frame is any one of the following: an effective signaling domain The common part of B media access control MAC layer, the common part physical layer of efficient signaling domain B and the common part physical layer of efficient signaling domain A.

With reference to the fourth aspect, or any one of the foregoing possible implementation manners of the fourth aspect, in a third possible implementation manner of the fourth aspect, the sending unit is further configured to send channel state information CSI to the AP; The unit is further configured to receive resource allocation information that is sent by the AP, where the expected resource allocation information includes: a number of resource units, a desired modulation and coding scheme, and a desired space-time flow number; the determining unit is further configured to allocate information according to the resource Generate the target information.

With reference to the fourth aspect, or any one of the foregoing possible implementation manners of the fourth aspect, in the fourth possible implementation manner of the fourth aspect, the information about the expected received power is one of the following information: the value of the expected received power It is desirable to receive the power spectral density and the desired received power of each of the resource elements in the time-frequency resource.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect to any one of the third possible implementation manners, in the fifth possible implementation manner of the fourth aspect, the receiving a unit, configured to receive a reference received power broadcast by the AP; the determining unit, The body is configured to determine the expected received power according to the reference received power and the expected received power, and determine the transmit power according to the expected received power, where the information of the expected received power is the expected received power and the reference received power Difference.

With reference to the fourth aspect, or any one of the foregoing possible implementation manners of the fourth aspect, in a sixth possible implementation manner of the fourth aspect, the determining unit is further configured to acquire the Transmitting power of the AP; detecting a received signal strength indication RSSI in the beacon frame; determining a path loss between the first STA and the AP according to the transmit power of the AP and the RSSI.

In a fifth aspect, an embodiment of the present invention provides an access point AP, where the AP includes: a processor, configured to determine information about expected received power when multiple station STAs send uplink information to the AP on the same time-frequency resource. And a transceiver circuit configured to send the information of the expected received power to the plurality of STAs, so that each of the plurality of STAs determines the transmit power according to the expected received power.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the transceiver circuit is configured to send information about the expected received power to the multiple STAs by using a common part of the signaling domain in the downlink transmission frame.

With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the common part of the signaling domain in the downlink transmission frame is any one of the following: an effective signaling domain The common part of B media access control MAC layer, the common part physical layer of efficient signaling domain B and the common part physical layer of efficient signaling domain A.

With reference to the fifth aspect or any one of the foregoing possible implementation manners of the fifth aspect, in a third possible implementation manner of the fifth aspect, the processor is specifically configured to be used according to each of the multiple STAs The path loss to the AP determines the information of the expected received power.

With reference to the fifth aspect, or any one of the foregoing possible implementation manners of the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the transceiver circuit is further configured to receive the report reported by each of the multiple STAs a channel state information CSI, the processor, configured to determine resource allocation information of each of the plurality of STAs according to the CSI reported by each STA of the plurality of STAs and the expected received power, the resource allocation information The method includes: a number of resource units, a modulation and coding scheme, and a space-time stream; the transceiver circuit is further configured to send the determined resource allocation information of each of the plurality of STAs to each of the multiple STAs STA, so that each of the plurality of STAs transmits a data packet according to the determined resource allocation information.

With reference to the fifth aspect or any one of the foregoing possible implementation manners of the fifth aspect, in a fifth possible implementation manner of the fifth aspect, the information about the expected received power is one of the following information: the expectation The value of the received power, the expected received power spectral density, and the desired received power of each of the resource elements in the time-frequency resource.

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, the possible implementation manner of the fourth possible implementation manner, in the sixth possible implementation manner of the fifth aspect, the sending and receiving The circuit is further configured to broadcast a reference received power to all STAs in the service range; the processor is specifically configured to determine the expected received power, determine a difference between the expected received power and the reference received power, and determine the expected received power. The information is the difference between the expected received power and the reference received power.

With reference to the fifth aspect or any one of the foregoing possible implementation manners of the fifth aspect, in a seventh possible implementation manner of the fifth aspect, the processor is further configured to schedule a space-time frequency domain according to the expected received power Resources.

In a sixth aspect, the embodiment of the present invention provides a STA that is one of a plurality of STAs that communicate with an access point AP on the same time-frequency resource, and the STA includes: a transceiver circuit, configured to receive The information about the expected received power sent by the AP; the processor, configured to determine the transmit power according to the information about the expected received power; and the transceiver circuit is further configured to use the transmit power to transmit the target information.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the transceiver circuit is configured to receive information about the expected received power sent by the AP from a common part of the signaling domain in the downlink transmission frame.

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the common part of the signaling domain in the downlink transmission frame is any one of the following: an effective signaling domain The common part of B media access control MAC layer, the common part physical layer of efficient signaling domain B and the common part physical layer of efficient signaling domain A.

With the sixth aspect or the foregoing any possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the transceiver circuit is further configured to send channel state information CSI to the AP; The circuit is further configured to receive resource allocation information sent by the AP, where the expected resource allocation information includes: a number of resource units, a desired modulation and coding scheme, and a desired space-time stream number; the processor is further configured to allocate information according to the resource Generate the target information.

With reference to the sixth aspect, or any one of the foregoing possible implementation manners of the sixth aspect, in the fourth possible implementation manner of the sixth aspect, the information about the expected received power is one of the following information: the value of the expected received power Expecting the received power spectral density and the expectation of each resource unit in the time-frequency resource Receive power.

With reference to the sixth aspect or the first possible implementation manner of the sixth aspect, the possible implementation manner of the third possible implementation manner, in the fifth possible implementation manner of the sixth aspect, the sending and receiving The circuit is further configured to receive the reference received power of the AP broadcast; the processor is specifically configured to determine the expected received power according to the reference received power and the expected received power, and determine the transmit power according to the expected received power, The information of the expected received power is the difference between the expected received power and the reference received power.

With reference to the sixth aspect, or any one of the foregoing possible implementation manners of the sixth aspect, in a sixth possible implementation manner of the sixth aspect, the processor is further configured to acquire, when the AP sends a beacon frame, Transmitting power of the AP; detecting a received signal strength indication RSSI in the beacon frame; determining a path loss between the first STA and the AP according to the transmit power of the AP and the RSSI.

In the foregoing technical solution, for a plurality of STAs that can send uplink information to the AP by using the same time-frequency resource, the AP may determine information about the expected received power. The expected received power is the power that the AP expects to receive when receiving uplink information sent by each of the plurality of STAs. The AP may send the information of the expected received power to each of the plurality of STAs. In this way, each of the plurality of STAs constituting the plurality of STAs can determine the expected received power, and determine the transmission power to be used when transmitting the information according to the expected received power. In this way, it is possible to avoid the problem that the AP cannot accurately calculate the transmit power that each STA needs to use, and ensure that the AP uses the same or similar received power to receive uplink information sent by different STAs.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

FIG. 1 is a schematic flowchart of a power control method according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart of another method for controlling power according to an embodiment of the present invention.

3 is a schematic diagram of a communication system provided in accordance with an embodiment of the present invention.

4 is a schematic diagram of a HE-SIG-B MAC layer frame format carrying information of the expected received power.

FIG. 5 is a schematic diagram of a HE-SIG-B physical layer frame format carrying information of the expected received power.

6 is a schematic diagram of a HE-SIG-A physical layer frame format carrying information of the expected received power.

FIG. 7 is a schematic structural diagram of an access point according to an embodiment of the present invention.

FIG. 8 is a structural block diagram of a station according to an embodiment of the present invention.

FIG. 9 is a schematic structural diagram of an access point according to an embodiment of the present invention.

FIG. 10 is a structural block diagram of a station according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

It should be understood that the technical solution of the embodiment of the present invention can be applied to various communication systems supporting multi-point to single-point uplink transmission, including a wireless local area network (Wireless Line, WLAN for short) that supports multi-point to single-point uplink transmission. And cellular network systems, such as: High Efficiency WLAN (HEW) system, Global System of Mobile communication (GSM) system, Code Division Multiple Access (Code Division Multiple Access, Short for "CDMA") system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service ("GPRS"), Long Term Evolution (Long Term Evolution) "LTE") system, LTE Frequency Division Duplex ("FDD") system, LTE Time Division Duplex ("TDD"), Universal Mobile Telecommunication System ("Universal Mobile Telecommunication System") UMTS") and so on.

Site (English: Station, abbreviation: STA), also known as User Equipment (UE), Mobile Terminal (MT), mobile user equipment, etc., STA can be a mobile terminal, such as a mobile phone (or A "cellular" telephone and a computer having a mobile terminal, for example, may be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.

An access point (English: Access Point, AP for short) may be an AP in a WLAN system or a base station in a cellular network system. For example, it may be a Base Transceiver Station (BTS) in GSM or CDMA. It is a base station (NodeB) in WCDMA, and may also be an eNB or an e-NodeB in LTE, and the present invention is not limited thereto.

FIG. 1 is a schematic flowchart of a power control method according to an embodiment of the present invention. The method shown in Figure 1 is performed by the AP.

101. The AP determines information about expected received power when multiple STAs send uplink information to the AP on the same time-frequency resource.

102. The AP sends the information about the expected received power to the multiple STAs, so that each of the multiple STAs determines the transmit power according to the expected received power.

According to the method shown in FIG. 1, the AP can determine the information of the desired received power for a plurality of STAs that can transmit uplink information to the AP using the same time-frequency resource. The expected received power is the power that the AP expects to receive when receiving uplink information sent by each of the plurality of STAs. The AP may send the information of the expected received power to each of the plurality of STAs. In this way, each of the plurality of STAs constituting the plurality of STAs can determine the expected received power, and determine the transmission power to be used when transmitting the information according to the expected received power. In this way, it is possible to avoid the problem that the AP cannot accurately calculate the transmit power that each STA needs to use, and ensure that the AP uses the same or similar received power to receive uplink information sent by different STAs.

Further, the AP sends the information about the expected received power to the multiple STAs, and the AP sends the information about the expected received power to the multiple STAs by using a common part of the signaling domain in the downlink transmission frame. Specifically, the common part of the signaling domain in the downlink transmission frame may be any one of the following: a common part of the media access control of the High Efficiency Signaling B (English: High Efficiency Signaling B, referred to as: HE-SIG-B) (English: Medium Access Control, MAC for short), the physical layer of the common part of HE-SIG-B, and the physical layer of the common part of High Efficiency Signaling A (HE-SIG-A) . In this way, the AP can send the information of the expected received power to all STAs of the multiple STAs by using one message without separately transmitting information of the desired received power to each of the multiple STAs by using multiple messages. In this way, signaling overhead can be reduced to achieve resource saving.

Specifically, the AP determines the information about the expected received power when the multiple STAs send the uplink information to the AP on the same time-frequency resource, including: the path of the AP to the AP according to each STA of the multiple STAs. Loss, information that determines the expected received power.

Further, the method further includes: the AP further receiving channel state information (Crystal State: CSI) reported by each of the plurality of STAs; the AP reporting the message according to each of the multiple STAs The CSI and the expected received power, determining resource allocation information of each of the plurality of STAs, where the resource allocation information includes: a number of resource units (English: Resource Unit, abbreviated as: RU), a modulation and coding scheme :Modulation and Coding Scheme (MCS) and space-time streams (English: Number of Spatial Time Stream, Abbreviation: NSTS). Similarly, the resource allocation information may also be sent to each STA through a common part of the signaling domain in the downlink transmission frame, similar to the information of the expected received power.

Optionally, as an embodiment, before the AP determines information about expected received power when multiple STAs send uplink information to the AP on the same time-frequency resource, the method may further include: the AP is in the service scope. All the STAs broadcast the reference received power; the AP determines the information of the expected received power when the multiple STAs send the uplink information to the AP on the same time-frequency resource, including: the AP determines the expected received power; the AP determines the reference And a difference between the received power and the expected received power; the AP determines the information of the expected received power as a difference between the reference received power and the expected received power. In this way, the STA can directly determine the expected received power by using the difference and the reference received power.

Optionally, as another embodiment, the information about the expected received power may be any one of: a value of the expected received power, a desired received power spectral density, and a desired received power of each of the time-frequency resources. .

Further, the method may further include: the AP scheduling the space-time frequency domain resource according to the expected received power.

FIG. 2 is a schematic flowchart of another method for controlling power according to an embodiment of the present invention. The method shown in Figure 2 is performed by the first STA.

201. The first STA receives information about expected received power sent by the AP, where the first STA is one of a plurality of STAs that communicate with the AP on the same time-frequency resource.

202. The first STA determines, according to the information about the expected received power, the transmit power.

203. The first STA sends the target information by using the transmit power.

According to the method shown in FIG. 2, the first STA may determine the transmission power to be used according to the information of the expected received power transmitted by the AP. When the target information is the uplink information sent by the first STA to the AP, the AP may receive the uplink information sent by the first STA by using the received power. In this way, it is possible to avoid the problem that the AP cannot accurately calculate the transmit power that each STA needs to use, and ensure that the AP uses the same or similar received power to receive uplink information sent by different STAs.

Further, the first STA receives the information about the expected received power sent by the AP, and the first STA receives the information about the expected received power sent by the AP from a common part of the signaling domain in the downlink transmission frame. Specifically, the common part of the signaling domain in the downlink transmission frame may be any one of the following: High Efficiency Signaling B (English: High Efficiency Signaling B, referred to as: HE-SIG-B) The common part of the medium access control (English: Medium Access Control, MAC for short) layer, the public part of the HE-SIG-B physical layer and the efficient signaling domain A (English: High Efficiency SignalingA, referred to as: HE-SIG-A) The physical part of the public part. In this way, the AP can send the information of the expected received power to all STAs of the multiple STAs by using one message without separately transmitting information of the desired received power to each STA in the target STA group by using multiple messages. In this way, signaling overhead can be reduced to achieve resource saving.

Further, the method further includes: the first STA sends a CSI to the AP; the first STA receives the source allocation information sent by the AP, where the resource allocation information includes: the number of the RU, the MCS, and the NSTS; the first STA The target information is generated based on the resource allocation information. Similarly, the channel state information may also be the same as the information of the expected received power, and the first STA may receive through a common part of the signaling domain in the downlink transmission frame.

Optionally, as an embodiment, before the first STA receives the information about the expected received power sent by the AP, the method may further include: the first STA receiving the reference received power of the AP broadcast; the first STA is configured according to The information about the expected received power, determining the transmit power, includes: determining, by the first sTA, the expected received power according to the reference received power and the expected received power, and determining the transmit power according to the expected received power, wherein the expected receive The information of the power is the difference between the expected received power and the reference received power.

The information of the expected received power may be any one of the value of the desired received power, the expected received power spectral density, and the desired received power of each of the time-frequency resources.

Further, the first STA uses the transmit power to transmit the target information, where the target information is the uplink information sent by the first STA to the AP, or the first STA is supported to the end-to-end (English: Device to Device, In the case of the STA for communication: D2D), the target information is information sent by the first STA to another STA that establishes a D2D connection with the first STA. In this way, D2D communication can be made without affecting the communication of other STAs.

Further, the method may further include: the first STA acquiring the transmit power of the AP carried in the beacon frame sent by the AP; and the first STA detecting the received signal strength indication in the beacon frame (English: Received Signal Strength Indication, Abbreviation: RSSI) information; the first STA determines the path loss between the first STA and the AP according to the transmit power of the AP and the RSSI. Specifically, the path loss (English Path Loss, PL for short) between the first STA and the AP is the difference between the transmit power of the AP and the RSSI. The first STA may send the determined path loss to the AP. At the same time, the first STA can also receive information and path according to the expected AP. The path loss PL confirms the transmission power of the signal transmitted to the AP. For example, if the information of the expected received power is the value of the expected received power, the sum of the value of the expected received power and the path loss PL between the first STA and the AP is the transmit power of the first STA. This ensures that the actual received power of the AP after the path loss is still consistent with its expected received power.

To assist the person skilled in the art in a better understanding of the present invention, the invention will be described below in conjunction with the specific embodiments. It is to be understood that the specific embodiments are only intended to aid in understanding the technical solutions of the present invention and are not intended to limit the invention.

3 is a schematic diagram of a communication system provided in accordance with an embodiment of the present invention. As shown in FIG. 3, the communication system 300 includes an AP 301, and the STA 311, the STA 312, and the STA 313 can transmit uplink information to the AP 301 using the same time-frequency resource. For convenience of description, STA 311, STA 312, and STA 313 may be collectively referred to as STA group 310.

The AP 301 can determine information of the expected received power. Specifically, the AP 301 may acquire measurement information of each STA in the STA group 310, and determine a desired received power according to the measurement information of each STA. The measurement information may be the path loss of the AP to the STA. Specifically, the AP 301 can acquire the path loss PL1 of the AP 301 to the STA 311. The AP 301 can also acquire the path loss PL2 of the AP 301 to the STA 312. The AP 301 can also acquire the path loss PL3 of the AP 301 to the STA 313. The AP 301 can determine information of the expected received power based on PL1, PL2, and PL3.

The path loss of the AP 301 to the STA can be determined by the following procedure. Taking the STA 311 as an example, the STA 311 can obtain the transmit power of the AP 301 carried in the beacon frame sent by the AP 301. The STA 311 detects the Received Signal Strength Indication (RSSI) information in the beacon frame. The STA 311 determines the path loss between the STA 311 and the AP 301 based on the transmission power of the AP 301 and the RSSI. Specifically, the path loss PL1 between the STA 311 and the AP 301 is the difference between the transmission power of the AP 301 and the RSSI. The STA 311 can transmit the determined path loss to the AP 301. The STA 312 and the STA 313 in the STA group 310 can also perform the same process to acquire the path loss PL2 and PL3 to the AP 301.

The expected received power is the power that the AP 301 expects to receive when receiving each of the STAs in the STA group 310. The information of the expected received power may be any one of the value of the desired received power, the expected received power spectral density, and the desired received power of each of the time-frequency resources. The AP 301 determines the expected received power according to a Physical Layer Convergence Procedure (PLCP) protocol data unit (English: PLCP protocol data unit, PPDU for short). In other words, the AP 301 can determine the path loss. PL1, path loss PL2, and path loss PL3 are determined based on related information in one PPDU. Each STA in the STA group 310 is included in the PPDU.

After determining the information about the expected received power, the AP 301 may send the information about the expected received power to each STA in the STA group 310, so that each STA in the STA group 310 determines the expected received power and according to The received power is expected to determine the transmit power.

Optionally, as an embodiment, the AP 301 may separately send the information about the expected received power to each STA in the STA group.

Optionally, as another embodiment, the AP 301 may send the information about the expected received power to each STA in the STA group 310 by using a common part of the signaling domain in the downlink transmission frame. Specifically, the common part of the signaling domain in the downlink transmission frame may be any one of the following: a common part MAC layer of HE-SIG-B, a common part physical layer of HE-SIG-B, and HE-SIG-A The physical part of the public part. 4 is a schematic diagram of a HE-SIG-B MAC layer frame format carrying information of the expected received power. FIG. 5 is a schematic diagram of a HE-SIG-B physical layer frame format carrying information of the expected received power. 6 is a schematic diagram of a HE-SIG-A physical layer frame format carrying information of the expected received power. In this way, the AP can send the information of the expected received power to all the STAs in the target STA group by using one message, without using multiple messages to respectively send information of the desired received power to each STA in the target STA group. In this way, signaling overhead can be reduced to achieve resource saving.

Further, the AP 301 can also receive the CSI reported by each STA in the STA group 310. The AP 301 can determine resource allocation information of each STA according to the CSI reported by each STA and the expected received power. The resource allocation information may include: the number of RUs, the MCS, and the NSTS. Similarly, the resource allocation information may also be sent to each STA through a common part of the signaling domain in the downlink transmission frame, similar to the information of the expected received power.

Optionally, as another embodiment, the AP 301 may further broadcast the reference received power before determining the information about the expected received power. In this case, after determining the expected received power, the AP 301 may determine a difference between the expected received power and the reference received power, and determine to use a difference between the expected received power and the reference received power as the expected received power. information. In this way, the STA in the STA group 310 can determine the expected received power according to the reference received power and the difference between the expected received power and the reference received power.

The STA in the STA group 310 may determine the expected received power based on the information of the expected received power, and determine the transmission power for transmitting the target information based on the expected received power. The target information may be uplink information sent by the STA to the AP, or may be an STA that supports D2D communication. Information sent between. Specifically, the STA in the STA group 310 can also confirm the transmission power of the signal transmitted to the AP according to the information of the expected received power of the AP and the path loss PL. For example, if the information of the expected received power is the value of the expected received power, the sum of the value of the expected received power and the path loss PL between the STA and the AP is the transmit power of the STA. For example, the sum of the value of PL1 and the expected received power is the transmission power of the STA 311; the sum of the value of PL2 and the expected received power is the transmission power of the STA 312; and the sum of the value of the PL3 and the expected received power is the STA 313 Transmit power. This ensures that the actual received power of the AP after the path loss is still consistent with its expected received power.

With the above technical solution, the AP 301 only needs to determine the power that is expected to be received when receiving the uplink information transmitted by each STA in the STA group 310 without determining the transmission power used by each STA. The operation on the AP side is simplified, and the problem that the AP cannot accurately calculate the transmission power used by each STA is also avoided. The STA may determine the transmission power according to the expected received power required by the AP, and send the uplink information to the AP by using the determined transmission power. In this way, when the AP receives the uplink information sent by the STA using the determined transmit power, the AP may receive the uplink information by using the expected received power.

FIG. 7 is a schematic structural diagram of an access point according to an embodiment of the present invention. As shown in FIG. 7, the AP 700 includes a determining unit 701 and a transmitting unit 702.

The determining unit 701 is configured to determine information about expected received power when multiple STAs send uplink information to the AP on the same time-frequency resource.

The sending unit 702 is configured to send information about the expected received power to the multiple STAs, so that each of the multiple STAs determines the transmit power according to the expected received power.

According to the AP shown in FIG. 7, the AP 700 can determine the information of the desired received power for a plurality of STAs that can transmit uplink information to the AP 700 using the same time-frequency resource. The expected received power is the power that the AP 700 expects to receive when receiving uplink information transmitted by each of the plurality of STAs. The AP 700 may transmit the information of the expected received power to each of the plurality of STAs. In this way, each of the plurality of STAs constituting the plurality of STAs can determine the expected received power, and determine the transmission power to be used when transmitting the information according to the expected received power. In this way, it is possible to avoid the problem that the AP cannot accurately calculate the transmit power that each STA needs to use, and ensure that the AP uses the same or similar received power to receive uplink information sent by different STAs.

Specifically, the sending unit 702 is specifically configured to send information about the expected received power to the multiple STAs by using a common part of the signaling domain in the downlink transmission frame.

Optionally, the common part of the signaling domain in the downlink transmission frame is any one of the following: a common part of the high-efficiency signaling domain B, a media access control MAC layer, a common part of the high-efficiency signaling domain B, and a high-efficiency signal Let the physical part of the common part of domain A.

Specifically, the determining unit 701 is specifically configured to determine information about the expected received power according to a path loss to the AP of each of the multiple STAs.

Further, the AP further includes: a receiving unit 703, configured to receive CSI reported by each of the plurality of STAs; and a determining unit 701, configured to perform CSI and the expectation reported according to each STA of the multiple STAs Receiving power, determining resource allocation information of each of the plurality of STAs, where the resource allocation information includes: a number of resource units, a modulation and coding scheme, and a space-time stream number; the sending unit 702 is further configured to determine the determined Resource allocation information of each of the plurality of STAs is transmitted to each of the plurality of STAs, so that each of the plurality of STAs transmits a data packet according to the determined resource allocation information.

Optionally, as an embodiment, the information about the expected received power is one of: a value of the expected received power, a desired received power spectral density, and a desired received power of each resource unit in the time-frequency resource.

Optionally, as another embodiment, the sending unit 702 is further configured to broadcast the reference received power to all the STAs in the service range. The determining unit 701 is specifically configured to determine the expected received power, determine the expected received power, and the reference. The difference between the received powers and the information determining the expected received power is the difference between the expected received power and the reference received power.

Further, the determining unit is further configured to schedule the space-time frequency domain resource according to the expected received power.

FIG. 8 is a structural block diagram of a station according to an embodiment of the present invention. The STA 800 shown in FIG. 8 is one of a plurality of STAs that communicate with an access point AP on the same time-frequency resource. As shown in FIG. 8, the STA 800 includes:

The receiving unit 801 is configured to receive information about the expected received power sent by the AP.

The determining unit 802 is configured to determine the transmit power according to the information about the expected received power.

The transmitting unit 803 is configured to send the target information by using the transmission power.

The STA 800 shown in FIG. 8 can determine the transmission power to be used according to the information of the expected received power transmitted by the AP. When the target information is uplink information sent by the STA 800 to the AP, the AP may receive the uplink information sent by the STA 800 using the desired received power. In this way, it is possible to avoid the problem that the AP cannot accurately calculate the transmit power that each STA needs to use, and ensure that the AP uses the same or similar received power to receive uplink information sent by different STAs.

Specifically, the receiving unit 801 is specifically configured to receive information about the expected received power sent by the AP from a common part of the signaling domain in the downlink transmission frame.

Further, the sending unit 803 is further configured to send the channel state information CSI to the AP, and the receiving unit 801 is further configured to receive resource allocation information that is sent by the AP, where the expected resource allocation information includes: a number of resource units, and a desired modulation code. The scheme and the expected space-time flow number; the determining unit 802 is further configured to generate the target information according to the resource allocation information.

Optionally, as another embodiment, the receiving unit 801 is further configured to receive the reference received power of the AP broadcast, and the determining unit 802 is configured to determine, according to the reference received power and the information about the expected received power, the expected receiving. And determining the transmit power according to the expected received power, wherein the information of the expected received power is a difference between the expected received power and the reference received power.

Further, the determining unit 802 is further configured to: acquire a transmit power of the AP that is carried by the AP when the beacon frame is sent; detect a received signal strength indicator RSSI in the beacon frame; and determine, according to the transmit power of the AP and the RSSI Path loss between the first STA and the AP.

FIG. 9 is a schematic structural diagram of an access point according to an embodiment of the present invention. As shown in FIG. 9, the AP 900 includes a processor 901, a transceiver circuit 902, and a memory 903.

The various components in the AP 900 are coupled together by a bus system 904, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 904 in FIG.

The method disclosed in the foregoing embodiments of the present invention may be applied to the processor 901 or implemented by the processor 901. The processor 901 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 901 or an instruction in a form of software. The processor 901 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or a field programmable gate array (Field Programmable Gate Array). FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read only memory or an electrically erasable programmable memory, a register, etc. In the storage medium. The storage medium is located in the memory 903, and the processor 901 reads the instructions in the memory 903 and completes the steps of the above method in combination with its hardware.

The processor 901 is configured to determine information about expected received power when multiple STAs send uplink information to the AP on the same time-frequency resource.

The transceiver circuit 902 is configured to send the information about the expected received power to the multiple STAs, so that each of the multiple STAs determines the transmit power according to the expected received power.

According to the AP shown in FIG. 9, the AP 900 can determine the information of the desired received power for a plurality of STAs that can transmit uplink information to the AP 900 using the same time-frequency resource. The expected received power is power that the AP 900 expects to receive when receiving uplink information transmitted by each of the plurality of STAs. The AP 900 may transmit the information of the expected received power to each of the plurality of STAs. In this way, each of the plurality of STAs constituting the plurality of STAs can determine the expected received power, and determine the transmission power to be used when transmitting the information according to the expected received power. In this way, it is possible to avoid the problem that the AP cannot accurately calculate the transmit power that each STA needs to use, and ensure that the AP uses the same or similar received power to receive uplink information sent by different STAs.

Specifically, the transceiver circuit 902 is specifically configured to send information about the expected received power to the multiple STAs by using a common part of the signaling domain in the downlink transmission frame.

Specifically, the processor 901 is specifically configured to determine information about the expected received power according to a path loss to the AP of each of the multiple STAs.

Further, the transceiver circuit 902 is further configured to receive the CSI reported by each of the multiple STAs, and the processor 901 is further configured to determine, according to the CSI reported by each STA of the multiple STAs, and the expected received power. Resource allocation information of each of the plurality of STAs, the resource allocation The information includes: a number of resource units, a modulation and coding scheme, and a space-time stream; the transceiver circuit 902 is further configured to send the determined resource allocation information of each of the plurality of STAs to each of the plurality of STAs. STAs, such that each of the plurality of STAs transmits a data packet according to the determined resource allocation information.

Optionally, as another embodiment, the transceiver circuit 902 is further configured to broadcast reference reception power to all STAs in the service range; the processor 901 is specifically configured to determine the expected received power, determine the expected received power and the reference. The difference between the received powers and the information determining the expected received power is the difference between the expected received power and the reference received power.

Further, the processor 901 is further configured to schedule a space-time frequency domain resource according to the expected received power.

FIG. 10 is a structural block diagram of a station according to an embodiment of the present invention. The STA 1000 shown in FIG. 10 is one of a plurality of STAs that communicate with an access point AP on the same time-frequency resource. As shown in FIG. 10, the STA 1000 includes a transceiver circuit 1001, a processor 1002, and a memory 1003.

The various components in the STA 1000 are coupled together by a bus system 1004 that includes, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1004 in FIG.

The method disclosed in the foregoing embodiments of the present invention may be applied to the processor 1002 or implemented by the processor 1002. The processor 1002 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1002 or an instruction in a form of software. The processor 1002 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or the like. Programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in random access memory (RAM), flash memory, only Read-Only Memory (ROM), programmable read-only memory or electrically erasable programmable memory, registers, etc., are well-known storage media in the field. The storage medium is located in the memory 1003, and the processor 1002 reads the instructions in the memory 1003 and completes the steps of the above method in combination with its hardware.

The transceiver circuit 1001 is configured to receive information about a desired received power sent by the AP.

The processor 1002 is configured to determine, according to the information about the expected received power, the transmit power.

The transceiver circuit 1001 is further configured to transmit the target information using the transmission power.

The STA 1000 shown in FIG. 10 can determine the transmission power to be used according to the information of the expected received power transmitted by the AP. When the target information is the uplink information sent by the STA 1000 to the AP, the AP may receive the uplink information sent by the STA 1000 using the expected received power. In this way, it is possible to avoid the problem that the AP cannot accurately calculate the transmit power that each STA needs to use, and ensure that the AP uses the same or similar received power to receive uplink information sent by different STAs.

Specifically, the transceiver circuit 1001 is specifically configured to receive information about the expected received power sent by the AP from a common part of the signaling domain in the downlink transmission frame.

Further, the transceiver circuit 1001 is further configured to send channel state information CSI to the AP, and the transceiver circuit 1001 is further configured to receive resource allocation information sent by the AP, where the expected resource allocation information includes: a number of resource units, and a desired modulation code. The scheme and the expected space-time flow number; the processor 1002 is further configured to generate the target information according to the resource allocation information.

Optionally, as another embodiment, the transceiver circuit 1001 is further configured to receive a reference received power of the AP broadcast, where the processor 1002 is configured to determine the expected reception according to the reference received power and the expected received power information. And determining the transmit power according to the expected received power, wherein the information of the expected received power is a difference between the expected received power and the reference received power.

Further, the processor 1002 is further configured to: acquire a transmit power of the AP that is carried by the AP when the beacon frame is sent; detect an RSSI in the beacon frame; and determine, according to the transmit power of the AP and the RSSI, the first STA to Path loss between the APs.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. All modifications are intended to be included within the scope of the invention, and the scope of the invention should be

Claims

A method of controlling power, the method comprising:

The access point AP determines information of expected received power when the plurality of station STAs send uplink information to the AP on the same time-frequency resource;

The AP transmits the information of the expected received power to the plurality of STAs, so that each of the plurality of STAs determines a transmit power according to the expected received power.
The method of claim 1, wherein the sending, by the AP, the information about the expected received power to the plurality of STAs comprises:

The AP transmits the information of the expected received power to the plurality of STAs using a common part of the signaling domain in the downlink transmission frame.
The method according to claim 2, wherein a common part of the signaling domain in the downlink transmission frame is any one of the following: a common part of the efficient signaling domain B, a medium access control MAC layer, and an efficient signaling domain B. Part of the physical layer and the common part of the physical layer of the efficient signaling domain A.
The method according to any one of claims 1 to 3, wherein the AP determines information of expected received power when a plurality of station STAs transmit uplink information to the AP on the same time-frequency resource, including :

The AP determines information about the expected received power according to a path loss of each of the plurality of STAs to the AP.
The method of any of claims 1 to 4, further comprising:

Receiving, by the AP, channel state information CSI reported by each of the plurality of STAs;

Determining, by the AP, resource allocation information of each of the multiple STAs according to the CSI and the expected received power reported by each of the multiple STAs, where the resource allocation information includes: Number, modulation coding scheme and space-time flow number;

Transmitting, by the AP, the determined resource allocation information of each of the multiple STAs to each of the multiple STAs, so that each of the multiple STAs according to the determined resource allocation information Send a packet.
The method according to any one of claims 1 to 5, wherein the information of the expected received power is one of: a value of the expected received power, a desired received power spectral density, and the time frequency. The expected received power of each resource element in the resource.
The method according to any one of claims 1 to 5, wherein before the AP determines information of expected received power when a plurality of station STAs transmit uplink information to the AP on the same time-frequency resource The method further includes:

The AP broadcasts a reference received power to all STAs in the service range;

The AP determines the information about the expected received power when the multiple STAs send the uplink information to the AP on the same time-frequency resource, including:

The AP determines the expected received power;

Determining, by the AP, a difference between the expected received power and the reference received power;

The AP determines that the information of the expected received power is a difference between the expected received power and the reference received power.
The method according to any one of claims 1 to 7, wherein the method further comprises:

The AP schedules space-time frequency domain resources according to the expected received power.
A method of controlling power, the method comprising:

The first station STA receives information about the expected received power sent by the AP, where the first STA is one of a plurality of STAs that communicate with the access point AP on the same time-frequency resource;

Determining, by the first STA, the sending power according to the information about the expected received power;

The first STA transmits the target information using the transmission power.
The method of claim 9, wherein the receiving, by the first station STA, the information about the expected received power sent by the AP comprises:

The first STA receives information of the expected received power sent by the AP from a common part of a signaling domain in a downlink transmission frame.
The method according to claim 10, wherein a common part of the signaling domain in the downlink transmission frame is any one of the following: a common part of the efficient signaling domain B, a medium access control MAC layer, and an efficient signaling domain B. Part of the physical layer and the common part of the physical layer of the efficient signaling domain A.
The method according to any one of claims 9 to 11, wherein the method further comprises:

Transmitting, by the first STA, channel state information CSI to the AP;

Receiving, by the first STA, resource allocation information sent by the AP, where the expected resource allocation information includes: a number of resource units, a desired modulation and coding scheme, and a desired space-time flow number;

The first STA generates the target information according to the resource allocation information.
The method according to any one of claims 9 to 12, wherein the information of the expected received power is one of: a value of the expected received power, a desired received power spectral density, and the time frequency. The expected received power of each resource element in the resource.
The method according to any one of claims 9 to 12, wherein before the first station STA receives the information of the expected received power sent by the AP, the method further includes:

Receiving, by the first STA, a reference received power of the AP broadcast;

Determining, by the first STA, the sending power according to the information about the expected received power, including:

Determining, by the first STA, the expected received power according to the reference received power and the information of the expected received power, and determining the transmit power according to the expected received power, where the information of the expected received power is the The difference between the received power and the reference received power is desired.
The method according to any one of claims 9 to 14, wherein before the first station STA receives the information of the expected received power sent by the AP, the method further includes:

The first STA acquires a transmit power of the AP that is carried by the AP when the beacon frame is sent;

The first STA detects a received signal strength indication RSSI in the beacon frame;

The first STA determines a path loss between the first STA and the AP according to the transmit power of the AP and the RSSI.
An access point AP, where the AP includes:

a determining unit, configured to determine information about expected received power when multiple station STAs send uplink information to the AP on the same time-frequency resource;

And a sending unit, configured to send information about the expected received power to the multiple STAs, so that each of the multiple STAs determines a transmit power according to the expected received power.
The AP according to claim 16, wherein the sending unit is specifically configured to send the information about the expected received power to the plurality of STAs by using a common part of a signaling domain in a downlink transmission frame.
The AP according to claim 17, wherein a common part of the signaling domain in the downlink transmission frame is any one of the following: a common part of the efficient signaling domain B, a medium access control MAC layer, and an efficient signaling domain B. Part of the physical layer and the common part of the physical layer of the efficient signaling domain A.
The AP according to any one of claims 16 to 18, wherein the determining unit is configured to determine, according to a path loss to the AP of each of the plurality of STAs, Information about the expected power reception.
The AP according to any one of claims 16 to 19, wherein the AP further comprises:

a receiving unit, configured to receive channel state information CSI reported by each of the plurality of STAs;

The determining unit is further configured to determine, according to the CSI reported by each STA of the multiple STAs and the expected received power, resource allocation information of each of the multiple STAs, where the resource allocation information Including: the number of resource units, modulation and coding schemes, and space-time streams;

The sending unit is further configured to send the determined resource allocation information of each of the plurality of STAs to each of the plurality of STAs, so that each of the plurality of STAs is configured according to The determined resource allocation information is sent to the data packet.
The AP according to any one of claims 16 to 20, wherein the information of the expected received power is one of: a value of the expected received power, a desired received power spectral density, and the time frequency. The expected received power of each resource element in the resource.
The AP according to any one of claims 16 to 20, characterized in that

The sending unit is further configured to broadcast a reference receiving power to all STAs in the service range;

The determining unit is specifically configured to determine the expected received power, determine a difference between the expected received power and the reference received power, and determine that the expected received power information is the expected received power and the reference received The difference in power.
The AP according to any one of claims 16 to 22, wherein the determining unit is further configured to schedule a space-time frequency domain resource according to the expected received power.
A STA is characterized in that the STA is one of a plurality of STAs that communicate with an access point AP on the same time-frequency resource, and the STA includes:

a receiving unit, configured to receive information about expected received power sent by the AP;

a determining unit, configured to determine, according to the information about the expected received power, a transmit power;

And a sending unit, configured to send the target information by using the sending power.
The STA according to claim 24, wherein the receiving unit is specifically configured to receive information about the expected received power sent by the AP from a common part of a signaling domain in a downlink transmission frame.
The STA according to claim 25, wherein a common part of the signaling domain in the downlink transmission frame is any one of the following: a common part of the efficient signaling domain B, a medium access control MAC layer, and an efficient signaling domain B. Part of the physical layer and the common part of the physical layer of the efficient signaling domain A.
The STA according to any one of claims 24 to 26, wherein the transmitting unit is further configured to send channel state information CSI to the AP;

The receiving unit is further configured to receive resource allocation information sent by the AP, where the expected resource allocation information includes: a number of resource units, a desired modulation and coding scheme, and a desired space-time flow number;

The determining unit is further configured to generate the target information according to the resource allocation information.
The STA according to any one of claims 24 to 27, wherein the expectation The information of the received power is one of the following: a value of the expected received power, a desired received power spectral density, and a desired received power of each of the time-frequency resources.
The STA according to any one of claims 24 to 27, wherein the receiving unit is further configured to receive a reference received power broadcast by the AP;

The determining unit is specifically configured to determine the expected received power according to the reference received power and the expected received power, and determine the transmit power according to the expected received power, where the expected received power information A difference between the expected received power and the reference received power.
The STA according to any one of claims 24 to 29, wherein the determining unit is further configured to acquire a transmit power of the AP that is carried by the AP when transmitting a beacon frame;

Detecting a received signal strength indicator RSSI in the beacon frame;

Determining a path loss between the first STA and the AP according to the transmit power of the AP and the RSSI.