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WO2013037269A1 - Procédé et dispositif d'émission de données - Google Patents

Procédé et dispositif d'émission de données Download PDF

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Publication number
WO2013037269A1
WO2013037269A1 PCT/CN2012/080813 CN2012080813W WO2013037269A1 WO 2013037269 A1 WO2013037269 A1 WO 2013037269A1 CN 2012080813 W CN2012080813 W CN 2012080813W WO 2013037269 A1 WO2013037269 A1 WO 2013037269A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
site
station
power
transmitting
Prior art date
Application number
PCT/CN2012/080813
Other languages
English (en)
Chinese (zh)
Inventor
高磊
罗龙
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2013037269A1 publication Critical patent/WO2013037269A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • a Basic Service Set (BSS) is an essential part of a Wireless LAN.
  • a station (Station, referred to as STA) that is within a certain coverage area and has some kind of association forms a BSS.
  • STA station
  • the most basic form of association is that sites communicate directly with each other in a self-organizing network, which is called an independent BSS.
  • AP Access Point
  • BSS with infrastructure BSS with basic implementations can be interconnected by their APs through a distributed system.
  • TX0P Transmission Opportunity
  • a TX0P refers to a bounded period in which a station can transmit a specific communication category.
  • the station obtains TX0P through competition, and once the TX0P is obtained, the station can transmit data frames, control frames and management frames, and receive response frames.
  • the AP may have multiple direct data transmission objects. Therefore, when the AP obtains TX0P, there may be more than one data transmission object within one TX0P.
  • Multi-user Multiple Input Multiple Output is a MIM0 technology that transmits different data to multiple users at the same time.
  • User pairing and weighting are performed by the transmitter (Beamformer). Moment, the same Data is transmitted to multiple users on one frequency band, and interference between users is kept as small as possible.
  • the TX0P sharing mode under MU-MIM0 is defined.
  • multiple APs can share one TX0P
  • MU- Simultaneous transmission in MIM0 mode can save a lot of frequency resources.
  • MU-MIM0 mode there may be cases where the data lengths of the users are not equal. At this time, the data lengths of all users are equal by padding. Filling in users with short data lengths may result in a large amount of meaningless data, resulting in wasted resources.
  • An object of embodiments of the present invention is to provide a data transmission method and apparatus that fully utilizes the transmission power of an access point.
  • a data sending method includes: simultaneously transmitting data to at least two stations;
  • the power for transmitting the data of the first station is adjusted to be used for sending The data of the second site.
  • a device for data transmission includes: a transmitter, configured to simultaneously send data to at least two stations;
  • a first processor configured to send data of the first site if there is still a second site in the remaining sites that has not been sent after the data of the first site in the at least two sites is sent The power is adjusted to transmit data of the second site, and the transmitter is notified.
  • the data transmission method according to the embodiment of the present invention effectively utilizes the power of the data transmitted by the access point, and avoids power waste caused by the unequal length of data sent to each station in the MU-MIM0.
  • 1 is a sequence diagram of an AP transmitting data to a STA
  • FIG. 2 is a flowchart of a data transmitting method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an apparatus for data transmission according to an embodiment of the present invention.
  • FIG. 1 is a timing diagram of an AP transmitting data to a STA.
  • FIG. 1 exemplarily shows that the AP simultaneously transmits data of 4 STAs, which are numbered STA1, STA2, STA3, and STA4.
  • the number of STAs may be more or less than the number shown in Figure 1.
  • the AP needs to send data of 4 STAs.
  • the data sent by STA2 has been sent.
  • the STA3 data has also been sent.
  • the data of STA1 has also been transmitted, and only the data of STA4 remains in the T3 time period.
  • the embodiment of the present invention provides a data transmission method, which can effectively utilize the transmission power of the AP.
  • Method 200 includes:
  • 21 0 Send data to at least two sites simultaneously;
  • the foregoing step 21 0 may specifically be: sending data to the at least two sites simultaneously according to power weights allocated to the at least two sites;
  • the second station described above is a phase shift keying modulated station.
  • the first site and the second site shown in Fig. 2 are merely for convenience of description and are not intended to limit the scope of the embodiments of the present invention. Similarly, the third site described below is only for the convenience of description. The implementation process of the embodiment of the present invention will be described in detail below with reference to FIG.
  • the AP transmits the data of each STA by using the corresponding power according to the weight vector of the power of the data of each STA.
  • the weighting matrix can be as shown in equation (1):
  • ⁇ is the weight vector of the power of the STA1 STA3 data, which can be specifically set according to the specific situation.
  • the weighting matrix performs power normalization, which is normalized according to equation (2): Where F is the F norm.
  • the weight vector corresponding to the power of transmitting data to STA2 in the weighting matrix may be set to 0, and the weighting matrix becomes equation (3):
  • the STA is referred to as a first station, and the first station may be multiple.
  • the data of the plurality of STA2s may be adjusted to be used to transmit the remaining data when the data of the plurality of STA2s has been transmitted at the end of the TO period.
  • STA's data In the embodiment of the present invention, for convenience of description, the STA whose data has not been transmitted at the end of the TO period may be referred to as a second station.
  • STA1, STA3, and STA4 belong to a PSK-modulated STA. If STA1, STA3, and STA4 do not belong to the PSK-modulated STA, the power weight vector of the data for transmitting each STA remains unchanged during the subsequent T1, ⁇ 2, and ⁇ 3 time periods.
  • the power of the data for transmitting STA2 is adjusted to the data for transmitting STA1, and the normalized weighting matrix is:
  • the power for transmitting STA2 data is adjusted to be used for transmitting STA1 and STA3 data, for example, The power used to transmit STA2 data is adjusted according to the percentages A and B.
  • the normalized weighting matrix is:
  • the AP adjusts the power for transmitting data to STA2 to be used for transmitting STA1 in the T1 period.
  • Those skilled in the art can preset the sizes of A, B, and C according to the specific requirements of the transmitted data.
  • the normalized weighting matrix is:
  • the STA3 data has also been sent, that is, the data of one of the second stations has been transmitted.
  • the AP can adjust the power of the data used by the AP to send STA2 and STA3 to be used for the T2 time period.
  • the STA whose data has not been transmitted at the end of the T1 time period may be referred to as a third station, that is, STA1 and STA4 are third sites.
  • the weight vector corresponding to the power of transmitting data to STA2 and STA3 in the weighting matrix is set to 0, and the weighting matrix becomes equation (7):
  • the third station needs to be a PSK modulated STA.
  • the AP needs to confirm whether STA1 and STA4 are PSK modulated STAs. If the AP confirms that STA1 is a PSK-modulated STA, and STA4 is not a PSK-modulated STA, the AP may adjust the power of the data for transmitting STA2 and STA3 to the data for transmitting STA1 in the T2 period, and normalize at this time.
  • the weighting matrix is:
  • the AP may adjust the power for transmitting STA2 and STA3 data to be used for transmitting STA1 in the T2 time period.
  • the normalized weighting matrix is:
  • the data sent by the AP to STA1 is also sent. If the AP determines that STA4 is a PSK-modulated STA, the AP may adjust the power of the data for transmitting STA1, STA2, and STA3 to the data for transmitting STA4 in the T3 period, where the normalized weighting matrix is:
  • the PSK mentioned herein includes, but is not limited to, Binary Phase Shift Keying (BPSK) modulation, Quadrature Phase Shift Keying (QPSK) modulation, and eight phases. Phase Phase Shift Keying (8PSK).
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • 8PSK Phase Phase Shift Keying
  • the data transmission method according to the embodiment of the present invention effectively utilizes the power of the data transmitted by the access point, and avoids power waste caused by the unequal length of data sent to each station in the MU-MIM0.
  • device 300 includes:
  • a transmitter 31 configured to simultaneously send data to at least two stations
  • the foregoing transmitter 31 is specifically configured to simultaneously send data to the at least two sites according to power weights allocated for the at least two sites.
  • the first processor 320 is configured to: if there is still a second station in the remaining stations that has not been sent after the data of the first station in the at least two stations is sent, the first station is used to send the first station. The power of the data is adjusted to transmit data of the second station, and the transmitter 31 0 is notified.
  • the transmitter 31 0 After receiving the notification from the first processor 320, the transmitter 31 0 uses the power of the data previously used to transmit the first station to send data to the second station.
  • the transmitter 31 0 transmits data to STA1 to STA4 according to the normalized weighting matrix defined by the equation (2).
  • processor 320 determines if there is a PSK-modulated second station among the remaining STA1, STA3, and STA4.
  • the processor 320 determines that the STA1 is a PSK-modulated STA, that is, the second station, and the processor 320 adjusts the power for transmitting the STA2 data to the data for transmitting the STA1 according to the above formula (4).
  • the first site is sent according to a percentage preset for each second site.
  • the portion of the corresponding percentage of the power of the data is adjusted to transmit the data of each of the second stations, and the transmitter is notified, wherein the sum of the percentages preset for each of the second stations is equal to 100%;
  • the transmitter is configured to send a notification before receiving the processor
  • the power of the data of the first site is used to send data to the second site.
  • the device 300 further includes a second processor 330, configured to: when the data of the at least one second site is sent, if the remaining second sites are There is also a third station whose data has not been sent, the power for transmitting the data of the second station is adjusted to transmit data of the third station, and the transmitter 310 is notified; the transmitter receives After the notification by the second processor, the power of the data previously used to transmit the second station is used to send data to the second station.
  • a second processor 330 configured to: when the data of the at least one second site is sent, if the remaining second sites are There is also a third station whose data has not been sent, the power for transmitting the data of the second station is adjusted to transmit data of the third station, and the transmitter 310 is notified; the transmitter receives After the notification by the second processor, the power of the data previously used to transmit the second station is used to send data to the second station.
  • the second processor 330 confirms that STA1 is a PSK-modulated STA, that is, STA1 is a third station, and then the processor 330 allocates the data to be sent to STA2 and STA3 according to formula (8).
  • the power of the data is allocated to the transmitting unit 310 for transmitting data to STA1.
  • the second processor 330 is specifically configured to send the second site according to a percentage preset for each third site.
  • the portion of the corresponding percentage of the power of the data is adjusted to transmit the data of each of the third stations, and the transmitter is notified, wherein the sum of the percentages preset for each of the third stations is equal to 100%;
  • the transmitter uses the power for transmitting the data of the second station to send data to the third station.
  • the first site may be multiple.
  • the data sent to the multiple STAs 2 may be transmitted at the end of the TO time period, and the first processor 320 adjusts the power of the data for sending the multiple STAs 2 to send the Data of the second station, and notifying the transmitter 310; after receiving the notification of the first processor 310, the transmitter 310 transmits the power of the data used to send the multiple first stations to send the first Two site data.
  • the first processor 310 and the second processor 320 may be two independent processors or a processor integrated with functions.
  • the device 300 described in the embodiment of the present invention may be used to perform all the steps performed by the AP in the foregoing method embodiment, and has been described in detail in the method embodiment, and thus is not described herein again.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • 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 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, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium.
  • 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.) 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, Random Acces s Memory), a disk or an optical disk, and the like, and the program code can be stored. Medium.

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

Abstract

Les modes de réalisation de la présente invention concernent un procédé et un dispositif d'émission de données. Le procédé d'émission de données consiste à : émettre simultanément des données vers au moins deux sites ; si l'émission de données est terminée sur un premier site des deux sites ou plus et qu'un deuxième site, sur lequel l'émission de données n'est pas terminée, existe parmi les sites restants, réassigner alors la puissance utilisée pour l'émission de données vers le premier site à celle utilisée pour émettre les données vers le deuxième site. Le procédé d'émission de données selon les modes de réalisation de la présente invention utilise efficacement la puissance du point d'accès au cours de l'émission de données et évite un gaspillage de puissance résultant d'une longueur inégale de l'émission des données vers chaque site dans un système MU-MIMO etc.
PCT/CN2012/080813 2011-09-16 2012-08-31 Procédé et dispositif d'émission de données WO2013037269A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110275375.5A CN103002558B (zh) 2011-09-16 2011-09-16 数据发送方法和设备
CN201110275375.5 2011-09-16

Publications (1)

Publication Number Publication Date
WO2013037269A1 true WO2013037269A1 (fr) 2013-03-21

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CN (1) CN103002558B (fr)
WO (1) WO2013037269A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101110604A (zh) * 2006-07-18 2008-01-23 华为技术有限公司 一种在无线通信系统中发送多用户复用数据的方法及设备
US7324785B2 (en) * 2001-01-11 2008-01-29 Broadcom Corporation Transmit power control of wireless communication devices
CN101867942A (zh) * 2010-06-10 2010-10-20 北京星网锐捷网络技术有限公司 动态调整无线接入点覆盖范围的方法及装置
CN101933377A (zh) * 2008-02-01 2010-12-29 高通股份有限公司 在指定给无线通信设备的两个或更多个载波之间分配发射功率
CN102026359A (zh) * 2010-12-31 2011-04-20 深圳市普联技术有限公司 一种自动调节无线发射功率的方法、系统及ap和sta

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6735247B2 (en) * 2001-03-30 2004-05-11 Qualcomm, Incorporated Method and apparatus in a communication system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7324785B2 (en) * 2001-01-11 2008-01-29 Broadcom Corporation Transmit power control of wireless communication devices
CN101110604A (zh) * 2006-07-18 2008-01-23 华为技术有限公司 一种在无线通信系统中发送多用户复用数据的方法及设备
CN101933377A (zh) * 2008-02-01 2010-12-29 高通股份有限公司 在指定给无线通信设备的两个或更多个载波之间分配发射功率
CN101867942A (zh) * 2010-06-10 2010-10-20 北京星网锐捷网络技术有限公司 动态调整无线接入点覆盖范围的方法及装置
CN102026359A (zh) * 2010-12-31 2011-04-20 深圳市普联技术有限公司 一种自动调节无线发射功率的方法、系统及ap和sta

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CN103002558A (zh) 2013-03-27

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