CN107534931B

CN107534931B - Method of controlling power and related apparatus

Info

Publication number: CN107534931B
Application number: CN201580078662.3A
Authority: CN
Inventors: 刘亚林; 张佳胤; 罗俊; 庞继勇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-06-12
Filing date: 2015-06-12
Publication date: 2020-09-08
Anticipated expiration: 2035-06-12
Also published as: WO2016197379A1; CN107534931A

Abstract

The embodiment of the invention provides a method for controlling power and related equipment, wherein the method comprises the following steps: the method comprises the steps that an Access Point (AP) determines expected received power information when a plurality of Stations (STA) send uplink information to the AP on the same time-frequency resource; the AP transmits the expected received power information to the plurality of STAs so that each STA of the plurality of STAs determines a transmit power according to the expected received power. The technical scheme can ensure that the AP receives the uplink information sent by different STAs by using the same or similar receiving power.

Description

Method of controlling power and related apparatus

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for controlling power and a related device.

Background

In order to meet the user requirement, the transmission from a Station (STA) to an Access Point (AP) may not only be a point-to-point transmission, but also be a multipoint-to-point transmission. The transmission of a single point and a single point means that the same channel at the same time or the same frequency band can only be communicated with one STA by an AP. The transmission between the multiple points and the single point means that the AP can communicate with multiple STAs on the same channel or the same frequency band at the same time. In multipoint-to-single point uplink transmission, an AP simultaneously receives uplink information transmitted from a plurality of stations. In order for the AP to better demodulate the received uplink information, the AP needs to receive the uplink information transmitted by each STA using the same or similar power. However, the environments of different STAs in the multiple STAs may be different, and the characteristics of the different STAs may also be different, so that the AP needs to indicate the transmission power of each STA to ensure that the reception power used by the AP is the same when uplink information arrives at the AP. But the AP needs to indicate the transmit power to each STA, which makes the signaling overhead too large. Meanwhile, the AP may not be able to determine the environment in which each STA is located. 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 uplink information transmitted by each STA using the same or similar power.

Disclosure of Invention

The embodiment of the invention provides a method for controlling power and related equipment, which can ensure that an AP receives 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: the method comprises the steps that an Access Point (AP) determines expected received power information when a plurality of Stations (STA) send uplink information to the AP on the same time-frequency resource; the AP transmits the expected received power information to the plurality of STAs so that each STA of the plurality of STAs determines a 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 sending, by the AP, the information of the expected received power to the multiple STAs includes: the AP transmits the information of the desired reception power to the STAs using a common part of a signaling field in a downlink transmission frame.

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 field in the downlink transmission frame is any one of the following: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the 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 first aspect, the determining, by the AP, information of expected received power when multiple stations STAs send uplink information to the AP on the same time-frequency resource includes: the AP determines the expected received power information based on a path loss to the AP for each of the plurality of STAs.

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: the AP receives Channel State Information (CSI) reported by each STA in the STAs; the AP determines resource allocation information of each STA of the plurality of STAs according to the CSI reported by each STA of the plurality of STAs and the expected received power, where the resource allocation information includes: the number of resource units, the modulation coding scheme and the number of space-time streams; the AP sends the determined resource allocation information of each STA in the STAs to each STA in the STAs so that each STA in the STAs sends data packets according to the determined resource allocation information.

With reference to the first aspect or any one of the foregoing possible implementations of the first aspect, in a fifth possible implementation of the first aspect, the information of the expected received power is one of: the value of the expected received power, the expected received power spectral density, and the expected received power for each resource unit in the time-frequency resource.

With reference to the first aspect or any possible implementation manner of the first possible implementation manner to the fourth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, before the determining, by the AP, information of expected received power when multiple stations STAs transmit uplink information to the AP on the same time-frequency resource, the method further includes: the AP broadcasts the reference receiving power to all STAs in the service range; the AP determining information of expected received power when multiple stations STA send uplink information to the AP on the same time-frequency resource includes: the AP determining the desired received power; the AP determining a difference between the desired received power and the reference received power; the AP determines the information of the desired received power as a difference between the desired received power and the reference received power.

With reference to the first aspect or any one of the foregoing possible implementations of the first aspect, in a seventh possible implementation of the first aspect, the method further includes: the AP schedules space-time-frequency domain resources according to the expected received power.

In a second aspect, an embodiment of the present invention provides a method for controlling power, where the method includes: a first station STA receives the information of expected receiving power sent by the AP, wherein the first station STA is one of a plurality of STAs which communicate with the AP on the same time-frequency resource; the first STA determines the transmission power according to the information of the expected receiving power; the first STA transmits target information using the transmission power.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the receiving, by the first STA, information of expected received power transmitted by the AP includes: the first STA receives information of the desired received power transmitted by the AP from a common portion of a signaling field in a downlink transmission frame.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the common portion of the signaling field in the downlink transmission frame is any one of the following: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

With reference to the second aspect or any one of the foregoing possible implementations of the second aspect, in a third possible implementation of the second aspect, the method further includes: the first STA sends Channel State Information (CSI) to the AP; the first STA receives resource allocation information sent by the AP, where the expected resource allocation information includes: the number of resource units, the expected modulation coding scheme and the expected number of space-time streams; 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 implementations of the second aspect, in a fourth possible implementation of the second aspect, the information of the expected received power is one of the following information: the value of the expected received power, the expected received power spectral density, and the expected received power for each resource unit in the time-frequency resource.

With reference to the second aspect or any possible implementation manner of the first possible implementation manner to the third possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, before the first STA receives the information of the expected received power sent by the AP, the method further includes: the first STA receives the reference received power broadcasted by the AP; the first STA determining a transmission power according to the information of the desired reception power, including: the first STA determines the expected received power according to the reference received power and the expected received power information and determines the transmission power according to the expected received power, wherein the expected received power information is the difference value between the expected received power and the reference received power.

With reference to the second aspect or any one of the foregoing possible implementations of the second aspect, in a sixth possible implementation of the second aspect, the method further includes: the first STA acquires the transmission power of the AP carried by the AP when the AP transmits the beacon frame; detecting a Received Signal Strength Indication (RSSI) in the beacon frame; and determining the path loss between the first STA and the AP according to the transmission power of the AP and the RSSI.

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 of expected received power when multiple stations STA send uplink information to the AP on the same time-frequency resource; a transmitting unit, configured to transmit the information of the expected received power to the plurality of STAs, so that each STA of the plurality of STAs determines a transmission 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 specifically configured to send the information of the expected received power to the STAs by using a common part of a signaling field in a 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 field in the downlink transmission frame is any one of the following: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

With reference to the third aspect or any one of the foregoing possible implementations of the third aspect, in a third possible implementation of the third aspect, the determining unit is specifically configured to determine the information of the expected received power according to a path loss to the AP of each STA of the multiple STAs.

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 channel state information CSI reported by each STA of the multiple STAs; the determining unit is further configured to determine resource allocation information of each STA of the multiple STAs according to the CSI reported by each STA of the multiple STAs and the expected received power, where the resource allocation information includes: the number of resource units, the modulation coding scheme and the number of space-time streams; the sending unit is further configured to send the determined resource allocation information of each STA of the plurality of STAs to each STA of the plurality of STAs, so that each STA of the plurality of STAs sends 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 a fifth possible implementation manner of the third aspect, the information of the expected received power is one of the following information: the value of the expected received power, the expected received power spectral density, and the expected received power for each resource unit in the time-frequency resource.

With reference to the third aspect or any possible implementation manner of the first possible implementation manner to the fourth possible implementation manner of the third aspect, in a sixth possible implementation manner of the third aspect, the sending unit is further configured to broadcast the reference received power to all STAs within a 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 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 implementations of the third aspect, in a seventh possible implementation of the third aspect, the determining unit is further configured to schedule space-time-frequency-domain resources according to the expected received power.

In a fourth aspect, an embodiment of the present invention provides a station STA, where the STA is one STA in multiple STAs communicating with an AP on the same time-frequency resource, and the STA includes: a receiving unit, configured to receive information of expected received power transmitted by the AP; a determining unit, configured to determine a transmission power according to the information of the expected received power; a transmitting unit for transmitting the target information using the transmission power.

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

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the common portion of the signaling field in the downlink transmission frame is any one of the following: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

With reference to the fourth aspect or any one of the foregoing possible implementations of the fourth aspect, in a third possible implementation of the fourth aspect, the sending 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: the number of resource units, the expected modulation coding scheme and the expected number of space-time streams; the determining unit is further configured to generate the target information according to the resource allocation information.

With reference to the fourth aspect or any one of the foregoing possible implementations of the fourth aspect, in a fourth possible implementation of the fourth aspect, the information of the expected received power is one of: the value of the expected received power, the expected received power spectral density, and the expected received power for each resource unit in the time-frequency resource.

With reference to the fourth aspect or any possible implementation manner of the first possible implementation manner to the third possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the receiving unit is further configured to receive a reference received power broadcasted by the AP; the determining unit is specifically configured to determine the expected received power according to the reference received power and the information of the expected received power, and determine the transmit power according to the expected received power, where the information of the expected received power is a difference between the expected received power and the reference received power.

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 transmission power of the AP, where the transmission power is carried when the AP transmits a beacon frame; detecting a Received Signal Strength Indication (RSSI) in the beacon frame; and determining the path loss between the first STA and the AP according to the transmission 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: the processor is used for determining the information of expected receiving power when a plurality of stations STA send uplink information to the AP on the same time-frequency resource; and a transceiving circuit for transmitting the information of the desired reception power to the plurality of STAs so that each STA of the plurality of STAs determines a transmission power according to the desired reception power.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the transceiver circuit is specifically configured to transmit the information of the expected received power to the STAs by using a common part of a signaling field in a 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 portion of the signaling field in the downlink transmission frame is any one of the following: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

With reference to the fifth aspect or any one of the foregoing possible implementations of the fifth aspect, in a third possible implementation of the fifth aspect, the processor is specifically configured to determine the information of the expected received power according to a path loss to the AP of each STA of the plurality of STAs.

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 channel state information CSI reported by each STA of the multiple STAs; the processor is further configured to determine resource allocation information of each STA of the plurality of STAs according to the CSI reported by each STA of the plurality of STAs and the expected received power, where the resource allocation information includes: the number of resource units, the modulation coding scheme and the number of space-time streams; the transceiver circuit is further configured to send the determined resource allocation information of each STA of the plurality of STAs to each STA of the plurality of STAs, so that each STA of the plurality of STAs sends a data packet according to the determined resource allocation information.

With reference to the fifth aspect or any one of the foregoing possible implementations of the fifth aspect, in a fifth possible implementation of the fifth aspect, the information of the expected received power is one of: the value of the expected received power, the expected received power spectral density, and the expected received power for each resource unit in the time-frequency resource.

With reference to the fifth aspect or any possible implementation manner of the first possible implementation manner to the fourth possible implementation manner of the fifth aspect, in a sixth possible implementation manner of the fifth aspect, the transceiver circuit is further configured to broadcast the reference received power to all STAs within a 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 that the information of the expected received power 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 implementations of the fifth aspect, in a seventh possible implementation of the fifth aspect, the processor is further configured to schedule space-time-frequency-domain resources according to the expected received power.

In a sixth aspect, an embodiment of the present invention provides a station STA, where the STA is one STA in multiple STAs communicating with an AP on the same time-frequency resource, and the STA includes: a transceiver circuit for receiving information of expected received power transmitted by the AP; a processor for determining a transmission power according to the information of the expected received power; and a transceiver circuit for transmitting the target information using the transmission power.

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

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the common portion of the signaling field in the downlink transmission frame is any one of the following: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

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

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

With reference to the sixth aspect or any possible implementation manner of the first possible implementation manner to the third possible implementation manner of the sixth aspect, in a fifth possible implementation manner of the sixth aspect, the transceiver circuit is further configured to receive a reference received power broadcasted by the AP; 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, where the expected received power is a 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 the transmission power of the AP, where the transmission power is carried when the AP transmits a beacon frame; detecting a Received Signal Strength Indication (RSSI) in the beacon frame; and determining the path loss between the first STA and the AP according to the transmission power of the AP and the RSSI.

In the above technical solution, for a plurality of STAs which can use the same time-frequency resource to send uplink information to the AP, the AP may determine information of the expected received power. The expected received power is a power expected to be received by the AP when receiving uplink information transmitted by each of the plurality of STAs. The AP may transmit the information of the desired received power to each of the plurality of STAs. In this way, each STA constituting the plurality of STAs can determine the expected received power and determine the transmission power to be used for transmitting information according to the expected received power. Therefore, the problem caused by the fact that the AP cannot accurately calculate the transmission power required by each STA can be avoided, and the AP is ensured to receive the uplink information sent by different STAs by using the same or similar receiving power.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a power control method provided according to an embodiment of the present invention.

Fig. 2 is a schematic flow chart of another method for controlling power provided in accordance with an embodiment of the present invention.

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

Fig. 4 is a diagram of a HE-SIG-B MAC layer frame format carrying information of the desired reception power.

Fig. 5 is a diagram of a HE-SIG-B physical layer frame format carrying information of the desired reception power.

Fig. 6 is a diagram of a HE-SIG-a physical layer frame format carrying information of the desired reception power.

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

Fig. 8 is a block diagram of a station provided 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 block diagram of a station provided according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It should be understood that the technical solution of the embodiment of the present invention may be applied to various communication systems supporting multipoint-to-single point uplink transmission, including a Wireless Local Area Network (WLAN) system and a cellular network system supporting multipoint-to-single point uplink transmission, for example: a High Efficiency wireless local area network (HEW) System, a Global System for Mobile communication (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) System, a Frequency Division Duplex (FDD) System, a TDD Duplex, a Universal Mobile Telecommunications System (UMTS), and the like.

A Station (STA) may also be referred to as User Equipment (UE), a Mobile Terminal (MT), a Mobile User Equipment (ms), and the like, and the STA may be a Mobile Terminal such as a Mobile phone (or referred to as a "cellular" phone) and a computer having a Mobile Terminal, for example, a portable, pocket, hand-held, computer-embedded, or vehicle-mounted Mobile device.

The Access Point (AP) may be an AP in a WLAN system or a Base Station in a cellular network system, for example, a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, or an eNB or e-NodeB in LTE, which is not limited in the present invention.

Fig. 1 is a schematic flow chart of a power control method provided according to an embodiment of the present invention. The method shown in fig. 1 is performed by an AP.

101, the AP determines information of expected received power when multiple STAs transmit uplink information to the AP on the same time-frequency resource.

102, the AP sends the expected received power information to the plurality of STAs so that each STA of the plurality of STAs determines a transmit power according to the expected received power.

According to the method shown in fig. 1, for a plurality of STAs that can transmit uplink information to the AP using the same time-frequency resource, the AP may determine information of the desired received power. The expected received power is a power expected to be received by the AP when receiving uplink information transmitted by each of the plurality of STAs. The AP may transmit the information of the desired received power to each of the plurality of STAs. In this way, each STA constituting the plurality of STAs can determine the expected received power and determine the transmission power to be used for transmitting information according to the expected received power. Therefore, the problem caused by the fact that the AP cannot accurately calculate the transmission power required by each STA can be avoided, and the AP is ensured to receive the uplink information sent by different STAs by using the same or similar receiving power.

Further, the AP sending the expected received power information to the plurality of STAs, comprising: the AP transmits the information of the desired reception power to the STAs using a common part of a signaling field in a downlink transmission frame. Specifically, the common part of the signaling field in the downlink transmission frame may be any one of the following: a common part Medium Access Control (MAC) layer of a High-efficiency signaling domain B (English: High efficiency signaling B, HE-SIG-B for short), a common part physical layer of the HE-SIG-B and a common part physical layer of a High-efficiency signaling domain A (HE-SIG-A for short). In this way, the AP may transmit the information of the desired reception power to all STAs of the plurality of STAs using one message without transmitting the information of the desired reception power to each STA of the plurality of STAs using a plurality of messages, respectively. Therefore, the signaling overhead can be reduced, and the purpose of saving resources is achieved.

Specifically, the determining, by the AP, information of expected received power when a plurality of STAs transmit uplink information to the AP on the same time-frequency resource includes: the AP determines the expected received power information based on a path loss to the AP for each of the plurality of STAs.

Further, the method also includes: the AP also receives Channel State Information (CSI) reported by each STA of the STAs; the AP determines resource allocation information of each STA of the plurality of STAs according to the CSI reported by each STA of the plurality of STAs and the expected received power, where the resource allocation information includes: the Number of Resource Units (RU), Modulation and Coding Scheme (MCS), and the Number of space-Time streams (NSTS). Similarly, the resource allocation information may also be transmitted to each STA through a common portion of a signaling field in a downlink transmission frame, as well as the information of the desired received power.

Optionally, as an embodiment, before the AP determines information of expected received power when multiple STAs transmit uplink information to the AP on the same time-frequency resource, the method may further include: the AP broadcasts the reference receiving power to all STAs in the service range; the AP determining information of expected received power when multiple STAs transmit uplink information to the AP on the same time-frequency resource, including: the AP determining the desired received power; the AP determining a difference between the reference received power and the expected received power; the AP determines the expected received power information as a difference between the reference received power and the expected received power. Thus, the STA may determine the desired receive power directly using the difference and the reference receive power.

Optionally, as another embodiment, the information of the expected received power may be any one of the following: the value of the expected received power, the expected received power spectral density, and the expected received power for each RU in the time-frequency resource.

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

Fig. 2 is a schematic flow chart of another method for controlling power provided in accordance with an embodiment of the present invention. The method shown in fig. 2 is performed by the first STA.

And 201, the first STA receives the information of the expected received power transmitted by the AP, wherein the first STA is one of the STAs communicating with the AP on the same time-frequency resource.

The first STA determines a transmit power based on the information of the desired receive power 202.

The first STA transmits target information using the transmission power 203.

According to the method shown in fig. 2, the first STA may determine the required transmit power to use according to the expected receive power information transmitted by the AP. When the target information is uplink information transmitted by the first STA to the AP, the AP may receive the uplink information transmitted by the first STA using a desired reception power. Therefore, the problem caused by the fact that the AP cannot accurately calculate the transmission power required by each STA can be avoided, and the AP is ensured to receive the uplink information sent by different STAs by using the same or similar receiving power.

Further, the first STA receiving the information of the expected received power transmitted by the AP includes: the first STA receives information of the desired received power transmitted by the AP from a common portion of a signaling field in a downlink transmission frame. Specifically, the common part of the signaling field in the downlink transmission frame may be any one of the following: a common part Medium Access Control (MAC) layer of a High-efficiency signaling domain B (English: High efficiency signaling B, HE-SIG-B for short), a common part physical layer of the HE-SIG-B and a common part physical layer of a High-efficiency signaling domain A (HE-SIG-A for short). In this way, the AP may transmit the information of the desired received power to all STAs of the plurality of STAs using one message without transmitting the information of the desired received power to each STA of the target group of STAs using a plurality of messages, respectively. Therefore, the signaling overhead can be reduced, and the purpose of saving resources is achieved.

Further, the method also includes: the first STA sends CSI to the AP; the first STA receives periodic source allocation information sent by the AP, where the resource allocation information includes: the number of RUs, MCS and NSTS; the first STA generates the target information according to the resource allocation information. Similarly, the channel state information may be the same as the expected received power information, and the first STA may receive the channel state information through a common portion of a signaling field in a downlink transmission frame.

Optionally, as an embodiment, before the first STA receives the information of the expected received power sent by the AP, the method may further include: the first STA receives the reference received power broadcasted by the AP; the first STA determining a transmission power according to the information of the desired reception power, including: the first sTA determines the expected received power according to the reference received power and the information of the expected received power, wherein the information of the expected received power is a difference value between the expected received power and the reference received power, and determines the transmit power according to the expected received power.

The information of the desired received power may be any one of: the value of the expected received power, the expected received power spectral density, and the expected received power for each RU in the time-frequency resource.

Further, the transmitting, by the first STA, the target information using the transmission power includes: the target information is uplink information sent by the first STA to the AP; alternatively, in the case that the first STA is a STA supporting peer-to-peer (D2D) communication, the target information is information sent by the first STA to another STA establishing a D2D connection with the first STA. In this way, D2D communication may be made to not affect the communications of other STAs.

Further, the method may further include: the first STA acquires the sending power of the AP carried in the AP sending beacon frame; the first STA detects Received Signal Strength Indication (RSSI) information in a beacon frame; and the first STA determines the path loss between the first STA and the AP according to the transmission power of the AP and the RSSI. Specifically, a Path Loss (PL) between the first STA and the AP is a difference between the transmission power of the AP and the RSSI. The first STA may send the determined path loss to the AP. Meanwhile, the first STA can also confirm the transmission power of its transmission signal 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 first STA and the AP is the transmission power of the first STA. This ensures that the actual received power of the AP after path loss is still consistent with its expected received power.

To assist those skilled in the art in better understanding the present invention, the present invention will be described in conjunction with specific embodiments. It should be understood that the specific examples are only for helping understanding the technical solutions of the present invention, and are not limiting to the present invention.

Fig. 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 the AP301, and the STA 311, the STA 312, and the STA 313 may use the same time-frequency resource to transmit uplink information to the AP 301. For convenience of description, STA 311, STA 312, and STA 313 may be collectively referred to as STA group 310.

AP301 may determine information of the desired received power. Specifically, the AP301 may acquire measurement information of each STA in the STA group 310, and determine the expected received power according to the measurement information of each STA. The measurement information may be the AP to STA path loss. Specifically, the AP301 may acquire the path loss PL1 from the AP301 to the STA 311. The AP301 may also obtain the path loss PL2 from the AP301 to the STA 312. The AP301 may also obtain the path loss PL3 from the AP301 to the STA 313. The AP301 may determine information of the desired received power from PL1, PL2, and PL 3.

The path loss from the AP301 to the STA can be determined by the following procedure. Taking STA 311 as an example, STA 311 may obtain the transmission power of AP301 carried in the beacon frame sent by AP 301; the STA 311 detects Received Signal Strength Indication (RSSI) information in the beacon frame; the STA 311 determines the path loss from the STA 311 to the AP301 based on the transmission power of the AP301 and the RSSI. Specifically, the path loss PL1 between the STA 311 and the AP301 is the difference between the transmission power of the AP301 and the RSSI. STA 311 may transmit the determined path loss to AP 301. The STA 312 and the STA 313 in the STA group 310 may also perform the same procedure to acquire the path losses PL2 and PL3 of the AP 301.

The expected received power is the power that the AP301 expects to receive at each STA in the receiving STA group 310. The information of the desired received power may be any one of: the value of the expected received power, the expected received power spectral density, and the expected received power for each RU in the time-frequency resource. The AP301 determines the expected received power according to a Physical Layer Convergence Protocol (PLCP) protocol data unit (PPDU) when calculating the expected received power. In other words, the path loss PL1, the path loss PL2, and the path loss PL3 that the AP301 can determine are determined from the relevant information in one PPDU. Each STA in the group of STAs 310 is included in the PPDU.

After determining the expected received power information, the AP301 may send the expected received power information to each STA in the STA group 310, so that each STA in the STA group 310 determines the expected received power and determines the transmission power according to the expected received power.

Optionally, as an embodiment, the AP301 may send the information of the expected received power to each STA in the STA group respectively.

Optionally, as another embodiment, the AP301 may use a common part of a signaling field in a downlink transmission frame to transmit the information of the expected received power to each STA in the STA group 310. Specifically, the common part of the signaling field in the downlink transmission frame may be any one of the following: a common part MAC layer of the HE-SIG-B, a common part physical layer of the HE-SIG-B, and a common part physical layer of the HE-SIG-A. Fig. 4 is a diagram of a HE-SIG-B MAC layer frame format carrying information of the desired reception power. Fig. 5 is a diagram of a HE-SIG-B physical layer frame format carrying information of the desired reception power. Fig. 6 is a diagram of a HE-SIG-a physical layer frame format carrying information of the desired reception power. In this way, the AP may transmit the information of the desired received power to all STAs in the target STA group using one message without separately transmitting the information of the desired received power to each STA in the target STA group using multiple messages. Therefore, the signaling overhead can be reduced, and the purpose of saving resources is achieved.

Further, the AP301 may also receive CSI reported by each STA in the STA group 310. The AP301 may 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: number of RUs, MCS, and NSTS. Similarly, the resource allocation information may also be transmitted to each STA through a common portion of a signaling field in a downlink transmission frame, as well as the information of the desired received power.

Optionally, as another embodiment, the AP301 may further broadcast a reference received power before determining the information of the expected received power. In this case, the AP301 may determine the difference between the desired received power and the reference received power after determining the desired received power, and determine to use the difference between the desired received power and the reference received power as the information of the desired received power. As such, the STAs in the group of STAs 310 may determine the desired received power based on the reference received power and the difference between the desired received power and the reference received power.

The STAs in the STA group 310 may determine the expected received power according to the information of the expected received power and determine the transmission power for transmitting the target information according to the expected received power. The target information may be uplink information transmitted by the STA to the AP, or may be information transmitted between STAs supporting D2D communication. Specifically, the STAs in the STA group 310 may also confirm the transmission power of their transmission signals 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 transmission power of the STA. For example, the sum of PL1 and the value of the expected received power is the transmit power of STA 311; the sum of PL2 and the value of the expected received power is the transmit power of STA 312; the sum of PL3 and the value of the expected received power is the transmit power of STA 313. This ensures that the actual received power of the AP after path loss is still consistent with its expected received power.

With the above technical solution, the AP301 only needs to determine the expected received power when receiving the uplink information transmitted by each STA in the STA group 310, and does not need to determine the transmission power used by each STA. The operation of the AP side is simplified, and meanwhile, the problem caused by the fact that the AP cannot accurately calculate the transmitting power used by each STA is solved. The STA may determine the transmission power according to the desired reception power required by the AP, and transmit uplink information to the AP using the determined transmission power. In this way, when the AP receives the uplink information transmitted by the STA using the determined transmission power, the AP can receive the uplink information using the desired reception 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.

A determining unit 701, configured to determine information of expected received power when multiple STAs transmit uplink information to the AP on the same time-frequency resource.

A sending unit 702, configured to send the information of the expected received power to the plurality of STAs, so that each STA of the plurality of STAs determines a sending power according to the expected received power.

According to the AP shown in fig. 7, for a plurality of STAs that can transmit uplink information to the AP 700 using the same time-frequency resource, the AP 700 may determine information of desired reception power. 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 desired received power to each STA among the plurality of STAs. In this way, each STA constituting the plurality of STAs can determine the expected received power and determine the transmission power to be used for transmitting information according to the expected received power. Therefore, the problem caused by the fact that the AP cannot accurately calculate the transmission power required by each STA can be avoided, and the AP is ensured to receive the uplink information sent by different STAs by using the same or similar receiving power.

Specifically, the sending unit 702 is specifically configured to send the information of the expected received power to the plurality of STAs by using a common part of a signaling field in a 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 Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

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

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

Optionally, as an embodiment, the information of the expected received power is one of the following information: the value of the expected received power, the expected received power spectral density, and the expected received power for 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 STAs within the service range; the determining unit 701 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 information of 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 space-time-frequency-domain resources according to the expected received power.

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

a receiving unit 801, configured to receive information of the expected received power transmitted by the AP.

A determining unit 802, configured to determine the transmit power according to the information of the expected receive power.

A transmitting unit 803, configured to transmit the target information using the transmission power.

The STA 800 shown in fig. 8 may determine the required transmission power according to the expected reception power information transmitted by the AP. When the target information is uplink information transmitted by the STA 800 to the AP, the AP may receive the uplink information transmitted by the STA 800 using a desired reception power. Therefore, the problem caused by the fact that the AP cannot accurately calculate the transmission power required by each STA can be avoided, and the AP is ensured to receive the uplink information sent by different STAs by using the same or similar receiving power.

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

Further, a sending unit 803 is further configured to send channel state information CSI to the AP; the receiving unit 801 is further configured to receive resource allocation information sent by the AP, where the expected resource allocation information includes: the number of resource units, the expected modulation coding scheme and the expected number of space-time streams; 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 a reference received power broadcasted by the AP; the determining unit 802 is specifically configured to determine the expected received power according to the reference received power and the information of the expected received power, where the information of the expected received power is a difference between the expected received power and the reference received power, and determine the transmit power according to the expected received power.

Further, the determining unit 802 is further configured to obtain the transmission power of the AP carried when the AP transmits the beacon frame; detecting a Received Signal Strength Indication (RSSI) in the beacon frame; and determining the path loss between the first STA and the AP according to the transmission power of the AP and the RSSI.

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, transceiver circuitry 902, and memory 903.

The various components in the AP 900 are coupled together by a bus system 904, wherein the bus system 904 includes a power bus, a control bus, and a status signal bus in addition to a data bus. But for clarity of illustration the various buses are labeled as bus system 904 in figure 9.

The method disclosed in the above 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 having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 901. The Processor 901 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable Gate Array (FPGA) or other programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a Random Access Memory (RAM), a flash Memory, a Read-Only Memory (ROM), a programmable ROM, an electrically erasable programmable Memory, a register, or other storage media that are well known in the art. The storage medium is located in the memory 903, and the processor 901 reads instructions in the memory 903 and performs the steps of the above method in combination with hardware thereof.

A processor 901, configured to determine information of expected received power when multiple STAs transmit uplink information to the AP on the same time-frequency resource.

Transceiving circuitry 902 for transmitting information of the desired receive power to the plurality of STAs such that each STA of the plurality of STAs determines a transmit power based on the desired receive power.

According to the AP shown in fig. 9, for a plurality of STAs capable of transmitting uplink information to the AP 900 using the same time-frequency resource, the AP 900 may determine information of desired reception power. The expected received power is the 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 desired received power to each STA of the plurality of STAs. In this way, each STA constituting the plurality of STAs can determine the expected received power and determine the transmission power to be used for transmitting information according to the expected received power. Therefore, the problem caused by the fact that the AP cannot accurately calculate the transmission power required by each STA can be avoided, and the AP is ensured to receive the uplink information sent by different STAs by using the same or similar receiving power.

In particular, the transceiver circuitry 902 is specifically configured to transmit the desired receive power information to the plurality of STAs using a common portion of a signaling field in a downlink transmission frame.

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

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

Optionally, as another embodiment, the transceiver 902 is further configured to broadcast the reference received power to all STAs within the service range; the processor 901 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 information of the expected received power is the difference between the expected received power and the reference received power.

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

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

The various components in STA 1000 are coupled together by a bus system 1004, where bus system 1004 includes a power bus, a control bus, and a status signal bus in addition to a data bus. But for the sake of clarity the various busses are labeled in fig. 10 as the bus system 1004.

The method disclosed by the embodiment of the invention can be applied to the processor 1002 or implemented by the processor 1002. The processor 1002 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1002. The Processor 1002 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable Gate Array (FPGA) or other programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a Random Access Memory (RAM), a flash Memory, a Read-Only Memory (ROM), a programmable ROM, an electrically erasable programmable Memory, a register, or other storage media that are well known in the art. 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 method in combination with the hardware.

A transceiver circuit 1001 is used to receive information of the desired reception power transmitted by the AP.

A processor 1002 is configured to determine a transmit power according to the expected receive power information.

The transmission/reception circuit 1001 is also configured to transmit target information using the transmission power.

The STA 1000 shown in fig. 10 may determine the transmission power to be used according to the information of the expected reception power transmitted by the AP. When the target information is uplink information transmitted by the STA 1000 to the AP, the AP may receive the uplink information transmitted by the STA 1000 using a desired reception power. Therefore, the problem caused by the fact that the AP cannot accurately calculate the transmission power required by each STA can be avoided, and the AP is ensured to receive the uplink information sent by different STAs by using the same or similar receiving power.

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

Further, the transceiver circuit 1001 is further configured to send channel state information CSI to the AP; the transceiver circuit 1001 is further configured to receive resource allocation information sent by the AP, where the expected resource allocation information includes: the number of resource units, the expected modulation coding scheme and the expected number of space-time streams; 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 broadcasted by the AP; the processor 1002 is specifically configured to determine the expected received power according to the reference received power and the information of the expected received power, and determine the transmit power according to the expected received power, where 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 obtain the transmission power of the AP, which is carried when the AP transmits the beacon frame; detecting the RSSI in the beacon frame; and determining the path loss between the first STA and the AP according to the transmission power of the AP and the RSSI.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method of controlling power, the method comprising:

the method comprises the steps that an Access Point (AP) determines the information of expected receiving power when a plurality of Stations (STA) send uplink information to the AP on the same time-frequency resource;

the AP transmitting information of the expected received power to the plurality of STAs so that each STA in the plurality of STAs determines a transmission power according to the expected received power,

the method further comprises the following steps:

the AP receives Channel State Information (CSI) reported by each STA in the STAs;

the AP determines resource allocation information of each STA of the plurality of STAs according to the CSI reported by each STA of the plurality of STAs and the expected received power, where the resource allocation information includes: the number of resource units, the modulation coding scheme and the number of space-time streams;

and the AP sends the determined resource allocation information of each STA in the STAs to each STA in the STAs so that each STA in the STAs can send data packets according to the determined resource allocation information.

2. The method of claim 1, wherein the AP sending the information of the desired received power to the plurality of STAs comprises:

the AP transmits the information of the desired reception power to the STAs using a common part of a signaling field in a downlink transmission frame.

3. The method of claim 2, the common part of the signaling fields in the downlink transmission frame being any one of: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

4. The method according to any of claims 1 to 3, wherein the AP determining information of expected received power when a plurality of Stations (STAs) transmit uplink information to the AP on the same time-frequency resource comprises:

the AP determines the expected received power information according to the path loss from each STA in the plurality of STAs to the AP.

5. The method of claim 1, wherein the information of the expected received power is one of: a value of the expected received power, an expected received power spectral density, and an expected received power for each resource unit in the time-frequency resources.

6. The method of claim 1, wherein prior to the AP determining information of expected received power when multiple stations STA transmit uplink information to the AP on the same time-frequency resource, the method further comprises:

the AP broadcasts the reference receiving power to all STAs in the service range;

the determining, by the AP, information of expected received power when a plurality of stations STA send uplink information to the AP on the same time-frequency resource includes:

the AP determines the expected received power;

the AP determines a difference value between the expected received power and the reference received power;

the AP determines the information of the expected received power to be the difference value of the expected received power and the reference received power.

7. The method of claim 1, wherein the method further comprises:

and the AP schedules space-time-frequency domain resources according to the expected received power.

8. A method of controlling power, the method comprising:

a first station STA receives information of expected receiving power sent by an access point AP, wherein the first STA is one of a plurality of STAs which communicate with the AP on the same time-frequency resource;

the first STA determines the transmission power according to the information of the expected receiving power;

the first STA transmits target information using the transmission power,

the method further comprises the following steps:

the first STA sends Channel State Information (CSI) to the AP;

the first STA receives resource allocation information sent by the AP, where the resource allocation information includes: the number of resource units, the modulation coding scheme and the number of space-time streams;

and the first STA generates the target information according to the resource allocation information.

9. The method of claim 8, wherein the first station STA receiving the information of the expected received power transmitted by the AP comprises:

the first STA receives the information of the expected received power sent by the AP from a common part of a signaling domain in a downlink transmission frame.

10. The method of claim 9, the common part of the signaling fields in the downlink transmission frame being any one of: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

11. The method according to any of claims 8 to 10, wherein the information of the expected received power is one of: a value of the expected received power, an expected received power spectral density, and an expected received power for each resource unit in the time-frequency resources.

12. The method according to any of claims 8 to 10, wherein before the first station STA receives the information of the expected received power transmitted by the AP, the method further comprises:

the first STA receives the reference received power broadcasted by the AP;

the first STA determining the transmission power according to the information of the expected reception power, including:

and the first STA determines the expected receiving power according to the reference receiving power and the information of the expected receiving power, and determines the transmitting power according to the expected receiving power, wherein the information of the expected receiving power is the difference value between the expected receiving power and the reference receiving power.

13. The method according to any of claims 8 to 10, wherein before the first station STA receives the information of the expected received power transmitted by the AP, the method further comprises:

the first STA acquires the transmission power of the AP carried by the AP when the AP transmits a beacon frame;

the first STA detecting a Received Signal Strength Indication (RSSI) in the beacon frame;

and the first STA determines the path loss between the first STA and the AP according to the transmission power of the AP and the RSSI.

14. An access point, AP, comprising:

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

a transmitting unit, configured to transmit the information of the expected received power to the multiple STAs, so that each STA of the multiple STAs determines a transmission power according to the expected received power;

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

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

the sending unit is further configured to send the determined resource allocation information of each STA of the plurality of STAs to each STA of the plurality of STAs, so that each STA of the plurality of STAs sends a data packet according to the determined resource allocation information.

15. The AP of claim 14, wherein the transmitting unit is specifically configured to transmit the information of the desired received power to the plurality of STAs using a common portion of a signaling field in a downlink transmission frame.

16. The AP of claim 15, wherein the common portion of the signaling fields in the downlink transmission frame is any one of: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

17. The AP of any of claims 14 to 16, wherein the determining unit is specifically configured to determine the information of the desired received power based on a path loss to the AP for each of the plurality of STAs.

18. The AP of any one of claims 14 to 16, wherein the information of the expected received power is one of: a value of the expected received power, an expected received power spectral density, and an expected received power for each resource unit in the time-frequency resources.

19. The AP of any one of claims 14 to 16,

the transmitting unit is further configured to broadcast the reference received power to all STAs within 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 information of the expected received power is the difference between the expected received power and the reference received power.

20. The AP of any one of claims 14 to 16, wherein the determining unit is further configured to schedule space-time-frequency-domain resources according to the expected received power.

21. A Station (STA), the STA being one of a plurality of STAs that communicate with an Access Point (AP) on the same time-frequency resource, the STA comprising:

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

a determining unit, configured to determine a transmission power according to the information of the expected received power;

a transmission unit configured to transmit target information using the transmission power;

the sending 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 resource allocation information includes: the number of resource units, the modulation coding scheme and the number of space-time streams;

the determining unit is further configured to generate the target information according to the resource allocation information.

22. The STA of claim 21, wherein the receiving unit is specifically configured to receive the expected receive power information sent by the AP from a common portion of a signaling field in a downlink transmission frame.

23. The STA of claim 22, the common portion of the signaling fields in the downlink transmission frame being any one of: a common part Medium Access Control (MAC) layer of the efficient signaling domain B, a common part physical layer of the efficient signaling domain B and a common part physical layer of the efficient signaling domain A.

24. The STA of any of claims 21 to 23, wherein the information of the desired received power is one of: a value of the expected received power, an expected received power spectral density, and an expected received power for each resource unit in the time-frequency resources.

25. The STA of any one of claims 21 to 23, 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 information of the expected received power, and determine the transmit power according to the expected received power, where the information of the expected received power is a difference between the expected received power and the reference received power.

26. The STA of any one of claims 21 to 23, wherein the determining unit is further configured to obtain the transmission power of the AP carried when the AP transmits a beacon frame;

detecting a Received Signal Strength Indication (RSSI) in the beacon frame;

and determining the path loss between the STA and the AP according to the transmission power of the AP and the RSSI.