WO2016197379A1 - Procédé de commande de puissance et dispositif associé - Google Patents

Procédé de commande de puissance et dispositif associé Download PDF

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Publication number
WO2016197379A1
WO2016197379A1 PCT/CN2015/081300 CN2015081300W WO2016197379A1 WO 2016197379 A1 WO2016197379 A1 WO 2016197379A1 CN 2015081300 W CN2015081300 W CN 2015081300W WO 2016197379 A1 WO2016197379 A1 WO 2016197379A1
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WIPO (PCT)
Prior art keywords
received power
information
expected received
sta
stas
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PCT/CN2015/081300
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English (en)
Chinese (zh)
Inventor
刘亚林
张佳胤
罗俊
庞继勇
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2015/081300 priority Critical patent/WO2016197379A1/fr
Priority to CN201580078662.3A priority patent/CN107534931B/zh
Publication of WO2016197379A1 publication Critical patent/WO2016197379A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes

Definitions

  • Embodiments of the present invention relate to the field of communication technologies, and, more particularly, to a method and related apparatus for controlling power.
  • 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.
  • STA station, abbreviation: STA
  • AP Access Point
  • 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.
  • the AP In multi-point to single-point uplink transmission, the AP simultaneously receives uplink information transmitted from multiple sites.
  • the AP 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.
  • 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.
  • the AP needs to indicate the transmission power to each STA, which makes the signaling overhead too large.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the method further includes: the AP adjusts according to the expected received power Time and space frequency domain resources.
  • 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.
  • 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.
  • 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.
  • 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. .
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the determining unit is further configured to schedule a space-time frequency domain according to the expected received power Resources.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the processor is further configured to schedule a space-time frequency domain according to the expected received power Resources.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 3 is a schematic diagram of a communication system provided in accordance with an embodiment of the present invention.
  • FIG. 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.
  • FIG. 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.
  • High Efficiency WLAN High Efficiency WLAN
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • Universal Mobile Telecommunication System Universal Mobile Telecommunication System
  • 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.
  • UE User Equipment
  • MT Mobile Terminal
  • 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.
  • BTS Base Transceiver Station
  • NodeB base station
  • eNB evolved NodeB
  • 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.
  • the AP determines information about expected received power when multiple STAs send uplink information to the AP on the same time-frequency resource.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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) .
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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. .
  • 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.
  • 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.
  • the first STA determines, according to the information about the expected received power, the transmit power.
  • the first STA sends the target information by using the transmit power.
  • the first STA may determine the transmission power to be used according to the information of the expected received power transmitted by 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 received signal strength indication in the beacon frame English: Received Signal Strength Indication, Abbreviation: RSSI
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • RSSI Received Signal Strength Indication
  • 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.
  • 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.
  • the AP 301 may separately send the information about the expected received power to each STA in the STA group.
  • 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.
  • 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.
  • FIG. 6 is a schematic diagram of a HE-SIG-A physical layer frame format carrying information of the expected received power.
  • 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.
  • signaling overhead can be reduced to achieve resource saving.
  • 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.
  • 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.
  • the AP 301 may further broadcast the reference received power before determining the information about 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the sending unit 803 is further configured to send the channel state information CSI to the AP
  • 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.
  • 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.
  • 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.
  • 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.
  • the AP 900 includes a processor 901, a transceiver circuit 902, and a memory 903.
  • bus system 904 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • bus system 904 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.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • 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.
  • RAM random access memory
  • ROM read-only memory
  • programmable read only memory or an electrically erasable programmable memory
  • register etc.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the STA 1000 includes a transceiver circuit 1001, a processor 1002, and a memory 1003.
  • bus system 1004 that includes, in addition to the data bus, a power bus, a control bus, and a status signal bus.
  • bus system 1004 includes, in addition to the data bus, a power bus, a control bus, and a status signal bus.
  • bus system 1004 includes, in addition to the data bus, a power bus, a control bus, and a status signal bus.
  • 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.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • 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.
  • 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.
  • 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.
  • 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. .

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé et de commande de puissance et un dispositif associé. Le procédé comprend les étapes suivantes : un point d'accès (AP) détermine des informations concernant une puissance de réception attendue lorsqu'une pluralité de stations (STA) envoyent des informations de liaison montante à l'AP sur la même ressource de temps et de fréquence ; et l'AP envoie les informations concernant la puissance de réception attendue à la pluralité de STA, de sorte que chaque STA parmi la pluralité de STA détermine une puissance d'émission en fonction de la puissance de réception attendue. La solution technique permet de garantir qu'un point d'accès (AP) utilise une puissance de réception identique ou similaire pour recevoir des informations de liaison montante émises par différentes STA.
PCT/CN2015/081300 2015-06-12 2015-06-12 Procédé de commande de puissance et dispositif associé WO2016197379A1 (fr)

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