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WO2005015844A1 - Interrogations d'apprentissage en acces multiple par repartition spatiale en multidiffusion - Google Patents

Interrogations d'apprentissage en acces multiple par repartition spatiale en multidiffusion Download PDF

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Publication number
WO2005015844A1
WO2005015844A1 PCT/US2004/025570 US2004025570W WO2005015844A1 WO 2005015844 A1 WO2005015844 A1 WO 2005015844A1 US 2004025570 W US2004025570 W US 2004025570W WO 2005015844 A1 WO2005015844 A1 WO 2005015844A1
Authority
WO
WIPO (PCT)
Prior art keywords
poll
response
training
transmitting
time delay
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2004/025570
Other languages
English (en)
Inventor
Qinghua Li
Minnie Ho
Adrian P. Stephens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intel Corp
Original Assignee
Intel Corp
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
Priority claimed from US10/740,648 external-priority patent/US20050136910A1/en
Application filed by Intel Corp filed Critical Intel Corp
Priority to CNA2004800265331A priority Critical patent/CN1853374A/zh
Priority to KR1020067002724A priority patent/KR100751161B1/ko
Priority to JP2006523256A priority patent/JP2007502074A/ja
Priority to EP04780412A priority patent/EP1652350A1/fr
Publication of WO2005015844A1 publication Critical patent/WO2005015844A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H04W74/06—Scheduled access using polling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/02—Hybrid access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1881—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with schedule organisation, e.g. priority, sequence management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems

Definitions

  • a base station may transmit or receive separate signals to or f om multiple mobile devices at the same time on the same frequency, provided the mobile devices are located in sufficiently different directions from the base station.
  • different signals may be simultaneously transmitted from each of separate spaced-apart antennas so that the combined transmissions are directional, i.e., the signal intended for each mobile device may be relatively strong in the direction of that mobile device and relatively weak in other directions.
  • the base station may receive the combined signals from multiple independent mobile devices at the same time on the same frequency through each of separate spaced-apart antennas, and separate the combined received signals from the multiple antennas into the separate signals from each mobile device through appropriate signal processing so that the reception is directional.
  • the parameters needed to control the directional nature of both transmissions and receptions may vary depending on various factors, including the direction of each mobile device from the base station. Since these factors may not be known in advance of operation, and may even change during operation, they may not be programmed into the system in advance.
  • a training phase may be performed in which a designated mobile device is polled to send a transmission with known characteristics to the base station at a designated time. The base station receives and processes the training transmission to derive the required parameters.
  • Each mobile device may be separately polled and respond in a similar manner until the base station has performed a separate training phase with every mobile device.
  • the overhead involved in setting up a separate training session with each of multiple mobile devices may occupy a significant amount of time and cause inefficiencies in the overall throughput of the network.
  • Fig. 1 shows a diagram of a communications network, according to an embodiment of the invention.
  • Fig. 2 shows a timing diagram of a training phase with multiple mobile devices, according to an embodiment of the invention.
  • Fig. 3 shows a flow chart of a method of operation of a base station, according to an embodiment of the invention.
  • Fig. 4 shows a flow chart of a method of operation of a mobile device, according to an embodiment of the invention.
  • Fig. 5 shows a block diagram of a base station, according to an embodiment of the invention.
  • Fig. 6 shows a block diagram of a mobile device, according to an embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION
  • references to "one embodiment”, “an embodiment”, “example embodiment”, “various embodiments”, etc., indicate that the embodiment(s) of the invention so described may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Further, repeated use of the phrase “in one embodiment” does not necessarily refer to the same embodiment, although it may. [0006] In the following description and claims, the terms “coupled” and
  • connection along with their derivatives, may be used. It should be understood that these terms are not intended as synonyms for each other. Rather, in particular embodiments, “connected” may be used to indicate that two or more elements are in direct physical or electrical contact with each other. “Coupled” may mean that two or more elements are either in direct physical or electrical contact, or that two or more elements are not in direct contact with each other but yet still co-operate or interact with each other.
  • processors may refer to any device or portion of a device that processes electronic data from registers and/or memory to transform that electronic data into other electronic data that may be stored in registers and/or memory.
  • a “computing platform” may comprise one or more processors.
  • wireless and its derivatives may be used to describe circuits, devices, systems, methods, techniques, communications channels, etc., that may communicate data through the use of modulated electromagnetic radiation through a non-solid medium. The term does not imply that the associated devices do not contain any wires, although in some embodiments they might not.
  • base station In keeping with common industry terminology, the terms "base station”,
  • access point and “AP” may be used interchangeably herein to describe an electronic device that may communicate wirelessly and substantially simultaneously with multiple other electronic devices
  • mobile device and “STA” may be used interchangeably to describe any of those multiple other electronic devices, which may have the capability to be moved and still communicate, though movement is not a requirement.
  • scope of the invention is not limited to devices that are labeled with those terms.
  • spatial division multiple access and SDMA may be used interchangeably.
  • these terms are intended to encompass any communication technique in which different signals may be transmitted by different antennas substantially simultaneously from the same device such that the combined transmitted signals result in different signals intended for different devices being transmitted substantially in different directions on the same frequency, and/or techniques in which different signals may be received substantially simultaneously through multiple antennas on the same frequency from different devices in different directions and the different signals may be separated from each other through suitable processing.
  • the term "same frequency”, as used herein, may include slight variations in the exact frequency due to such things as bandwidth tolerance, Doppler shift adaptations, parameter drift, etc.
  • Two or more transmissions to different devices are considered substantially simultaneous if at least a portion of each transmission to the different devices occurs at the same time, but does not imply that the different transmissions must start and/or end at the same time, although they may.
  • two or more receptions from different devices are considered substantially simultaneous if at least a portion of each reception from the different devices occurs at the same time, but does not imply that the different transmissions must start and/or end at the same time, although they may.
  • Variations of the words represented by the term SDMA may sometimes be used by others, such as but not limited to substituting "space” for "spatial", or “diversity” for "division". The scope of various embodiments of the invention is intended to encompass such differences in nomenclature.
  • Some embodiments of the invention may use a multicast signal to poll multiple mobile devices with a single transmission, with the mobile devices responding in a specific order at different times.
  • Fig. 1 shows a diagram of a communications network that may use multicast training polls, according to an embodiment of the invention.
  • a poll may be a request for the addressed device(s) to respond by transmitting a signal and/or information back to the polling device, where the training poll may request that the signal and/or information be of a format suitable to determine one or more communications operating parameters.
  • the illustrated embodiment of an SDMA-based network shows an AP 110 that may communicate with multiple STAs 131-134 located in different directions from the AP. Although AP 110 is shown with four antennas 120, other embodiments may have other arrangements (e.g., AP 110 may have two, three, or more than four antennas). Each STA may have at least one antenna to communicate wirelessly with the AP 110.
  • the STA antenna(s) may be adapted to operate omnidirectionally, but in other embodiments the STA antenna(s) may be adapted to operate directionally.
  • the STAs may be in fixed locations, but in other embodiments at least some of the STAs may be moving during and/or between communications sequences.
  • the AP 110 may be in a fixed location, but in other embodiments the AP 110 may be moving during and/or between communications sequences.
  • Fig. 2 shows a timing diagram of a communications sequence involving a multicast traimng poll, according to an embodiment of the invention.
  • the illustrated embodiment shows 5 STAs, labeled STA1 through STA5, but the scope of the invention is not limited to this quantity.
  • the AP may poll each STA in a training group (e.g., in the illustrated embodiment a training group consists of STA1-STA5), the poll requesting each of the selected STAs to send a training response back to the AP so that parameters for SDMA communication with that STA may be determined by the AP.
  • Each training response may occur at a different time so that the traimng responses from multiple STAs do not interfere with each other.
  • all five of the relevant STAs are polled in a single transmission by using a multicast transmission for a training poll.
  • a multicast transmission is addressed to multiple specific devices, each of which is expected to act upon the common content of the transmission. This is in contrast to the more common singly- addressed transmission (addressed to a single specific device), or a broadcast (which may be intended to be acted upon by any devices able to receive it).
  • the multicast training poll may be sent omnidirectionally, so that all STAs within range may receive the training poll, but only those that are addressed should respond to it, although the invention is not limited in this respect.
  • each addressed STA may also receive an individual timing indicator directing the STA to wait for a particular time duration before responding with a training response.
  • the individual timing durations are shown as ti - 1 5 for STA1 -STA5, respectively.
  • the timing indicator may be a simple ranking (e.g., 1, 2, 3, etc.) which the indicated STA may multiply by a time increment to determine how long to wait, but other embodiments may use other techniques (e.g., an indicator may be directly expressed in units of time; each STA may wait until the next higher-ranked STA has finished responding before transmitting, t * ⁇ may always be a short fixed delay such as 0, etc.).
  • the time ti for the training responses is shown in Fig. 2A as the time between the training response start time (T ST ) and the training response end time (T E ⁇ ).
  • the AP may initiate a data phase (not shown), using the parameters derived from the training phase.
  • the timing indicator for each STA may have been previously determined.
  • the time delay may have been delivered to each STA in a previous communication, although the scope of the invention is not limited to this or the other examples given.
  • the determination of which STAs to include in a multicast training poll may be determined by various factors. Each of the STAs may have previously established its presence with the AP, and may have provided information on its address, mode of wireless communication, possible data rates, etc. These and/or other factors may be considered by the AP in determining which STAs to place into the same multicast group. If the AP does not receive a satisfactory training response from a particular STA, that STA may be polled again (e.g., in another multicast training group). In some operations, a multicast training phase may be followed immediately by a data phase, but in other operations the training phase may be followed by another training phase with a different set of STAs, or by a different' type of communication phase. A data phase may involve only the same STAs that were in the preceding training phase, or may involve a different group of STAs that includes some, none, or all of the STAs that were in the preceding training phase.
  • Fig. 3 shows a flow chart of a method of operation which may be performed by a base station, according to an embodiment of the invention.
  • a training poll group may be formed at 310.
  • Various criteria may be used to determine which of the currently available STAs are to be associated with the particular training poll group. For example, currently usable SDMA parameters may already be known for some of the STAs, and those STAs might be excluded from the poll group in favor of other STAs for which SDMA parameters do not yet exist or need to be updated.
  • the AP may assign a different time delay for each STA in the group.
  • time delays may be in any usable form, e.g., a direct time delay, a quantity of known increments of time, an ordinal ranking which can be multiplied by known increments of time, etc.
  • the time delays may be determined such that the minimum time between any two time delays is sufficient for a mobile device to transmit a training response, so that two different training responses from two different mobile devices do not overlap.
  • a multicast training poll may be transmitted, containing the addresses of the STAs being polled, the time delays for the STAs being polled, and any other information deemed useful in the training poll.
  • the AP may receive the first training response at 340.
  • the AP may process the received training response and store the processed information for further processing at a later time.
  • the amount of processing performed at this point may vary (e.g., digitizing the signal and storing it for further processing, calculating SDMA parameters, etc.).
  • the AP may return to 340 to receive the next traimng response.
  • the loop formed by 340, 350 and 360 may continue until all the STAs in the poll group have had time to respond, at which time the training phase may end.
  • any of the polled STAs do not respond, or if the received response is not useable for its intended purpose (e.g., due to corrupted data), that STA may be polled again at a later time, possibly in another poll group.
  • a maximum number of retries for such polls may be established, although the scope of various embodiments of the invention is not limited in this respect.
  • Fig. 4 shows a flow chart of a method of operation which may be performed by a mobile device, according to an embodiment of the invention.
  • a multicast training poll may be received, containing the address or other identifier of this mobile device.
  • the timing indicator associated with this mobile device may be extracted from the multicast poll and a time delay may be determined from the timing indicator.
  • the mobile device may wait until the time delay determined at 420 has expired. The time delay may be measured from any feasible staring point, as previously described. Upon expiration of the time delay, the mobile device may transmit its own training response at 440.
  • Embodiments of the invention may be implemented in one or a combination of hardware, firmware, and software.
  • Embodiments of the invention may also be implemented as instructions stored on a machine-readable medium, which may be read and executed by a processing platform to perform the operations described herein.
  • a machine-readable medium may include any mechanism for storing or transmitting information in a form readable by a machine (e.g., a computer).
  • a machine-readable medium may include read only memory (ROM); random access memory (RAM); magnetic disk storage media; optical storage media; flash memory devices; electrical, optical, acoustical or other form of propagated signals (e.g., carrier waves, infrared signals, digital signals, etc.), and others.
  • Fig. 5 shows a block diagram of a base station, according to an embodiment of the invention.
  • Computing platform 550 may include one or more processors, and at least one of the one or more processors may be a digital signal processor (DSP).
  • DSP digital signal processor
  • AP 110 has four antennas 120, but other embodiments may have two, three, or more than four antennas.
  • base station 110 may have a modulator/demodulator 520, an analog-to-digital converter (ADC) 530, and a digital-to-analog converter (DAC) 540.
  • ADC analog-to-digital converter
  • DAC digital-to-analog converter
  • the combination of demodulator- ADC may convert received radio frequency signals from the antenna into digital signals suitable for processing by the computing platform 550.
  • the combination of DAC-modulator may convert digital signals from the computing platform 550 into radio frequency signals suitable for transmission through an antenna.
  • Other components not shown may be included in the illustrated blocks as needed, such as but not limited to amplifiers, filters, oscillators, multiple DACs and/or ADCs where only one is shown, etc
  • Fig. 6 shows a block diagram of a mobile device, according to an embodiment of the invention.
  • the illustrated components of mobile device 131 may include a computing platform 650, antenna 621, modulator/demodulator 620, ADC 630, and DAC 640 that may be functionally similar to those similarly-named components of Fig. 5, but the device of Fig. 6 is shown with a single antenna/ modulator/demodulator/ ADC/ DAC combination, and the computing platform 650 may perform the operations previously described for a mobile device rather than a base station, although various embodiments of the invention are not limited in these respects.
  • the foregoing description is intended to be illustrative and not limiting.

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

Abstract

Selon l'invention, lors de la mise en oeuvre de séquences d'apprentissage en accès multiple par répartition spatiale (SDMA), une station de base peut interroger plusieurs dispositifs mobiles avec la même interrogation d'apprentissage en multidiffusion, et les stations mobiles peuvent répondre séparément à différents moments en fonction d'une période d'attente attribuée à chaque station mobile.
PCT/US2004/025570 2003-08-08 2004-08-06 Interrogations d'apprentissage en acces multiple par repartition spatiale en multidiffusion Ceased WO2005015844A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CNA2004800265331A CN1853374A (zh) 2003-08-08 2004-08-06 组播sdma训练轮询
KR1020067002724A KR100751161B1 (ko) 2003-08-08 2004-08-06 멀티캐스트 ｓｄｍａ 트레이닝 폴을 위한 장치 및 방법과 머신 판독 가능한 매체
JP2006523256A JP2007502074A (ja) 2003-08-08 2004-08-06 マルチキャストｓｄｍａのトレーニング・ポーリング
EP04780412A EP1652350A1 (fr) 2003-08-08 2004-08-06 Interrogations d'apprentissage en acces multiple par repartition spatiale en multidiffusion

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US49393703P 2003-08-08 2003-08-08
US60/493,937 2003-08-08
US10/740,648 2003-12-18
US10/740,648 US20050136910A1 (en) 2003-12-18 2003-12-18 Multicast SDMA training polls

Publications (1)

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WO2005015844A1 true WO2005015844A1 (fr) 2005-02-17

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PCT/US2004/025570 Ceased WO2005015844A1 (fr) 2003-08-08 2004-08-06 Interrogations d'apprentissage en acces multiple par repartition spatiale en multidiffusion

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Country Link
EP (1) EP1652350A1 (fr)
JP (1) JP2007502074A (fr)
KR (1) KR100751161B1 (fr)
CN (1) CN1853374A (fr)
WO (1) WO2005015844A1 (fr)

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WO2009152765A1 (fr) * 2008-06-18 2009-12-23 Mediatek Inc. Procédé et système d'apprentissage de formation de faisceau et appareils de communications les utilisant
WO2010022091A1 (fr) * 2008-08-19 2010-02-25 Qualcomm Incorporated Procédés et appareil pour échange de trame pour données sdma de liaison montante
WO2010099497A1 (fr) * 2009-02-27 2010-09-02 Qualcomm Incorporated Procédés et appareils permettant de programmer des messages pour un accès multiple par répartition spatiale pour une demande de liaison montante (rsdma) dans un réseau local (lan) sans fil à accès multiple par répartition spatiale (sdma)
WO2010148076A1 (fr) * 2009-06-17 2010-12-23 Qualcomm Incorporated Communications sans fil à entrées multiples/sorties multiples pour utilisateurs multiples
WO2011002737A1 (fr) * 2009-06-29 2011-01-06 Qualcomm Incorporated Procédé et appareil pour l'envoi de messages de demande à des stations multiples
WO2010099494A3 (fr) * 2009-02-27 2011-01-20 Qualcomm Incorporated Fonctionnement de protocole et conception de message pour la transmission de données sdma à une pluralité de stations
WO2011025842A1 (fr) * 2009-08-25 2011-03-03 Qualcomm Incorporated Procédé et appareil de communication multi-utilisateurs dans un système de transmission de communications initiées par le client
WO2011112741A1 (fr) * 2010-03-09 2011-09-15 Qualcomm Incorporated Communication montante multiutilisateur utilisant un système edca avec interrogation
EP2478679A2 (fr) * 2009-09-18 2012-07-25 Qualcomm Incorporated Protocole d'assistance à un débit adaptatif de rétroaction d'informations d'état de canal dépendant de la station dans des systèmes de communication à utilisateurs multiples
US8699508B2 (en) 2003-12-18 2014-04-15 Intel Corporation Response scheduling for multiple receivers
JP2014161070A (ja) * 2009-12-23 2014-09-04 Intel Corp 無線通信デバイスのグループと同時に通信するデバイス、システム及び方法
US8976741B2 (en) 2009-02-27 2015-03-10 Qualcomm Incorporated Piggybacking information in transmit opportunities
EP2677693A4 (fr) * 2011-02-14 2015-06-03 Hitachi Ind Equipment Sys Système de communication
US9173191B2 (en) 2009-12-20 2015-10-27 Intel Corporation Device, system and method of simultaneously communicating with a group of wireless communication devices
EP2520128B1 (fr) * 2009-12-28 2023-02-22 Intel Corporation Exploitation efficiente de sdma en voie montante

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Cited By (38)

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US8699508B2 (en) 2003-12-18 2014-04-15 Intel Corporation Response scheduling for multiple receivers
WO2009152765A1 (fr) * 2008-06-18 2009-12-23 Mediatek Inc. Procédé et système d'apprentissage de formation de faisceau et appareils de communications les utilisant
US8503928B2 (en) 2008-06-18 2013-08-06 Mediatek Inc. Method and system for beamforming training and communications apparatuses utilizing the same
JP2012500595A (ja) * 2008-08-19 2012-01-05 クゥアルコム・インコーポレイテッド Ｓｄｍａアップリンクデータのフレーム交換のための方法および装置
WO2010022091A1 (fr) * 2008-08-19 2010-02-25 Qualcomm Incorporated Procédés et appareil pour échange de trame pour données sdma de liaison montante
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EP1652350A1 (fr) 2006-05-03
KR20060052976A (ko) 2006-05-19

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