WO2013168105A1 - Procédés, appareil et programme informatique pour configurer des transmissions sans fil - Google Patents

Procédés, appareil et programme informatique pour configurer des transmissions sans fil Download PDF

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Publication number
WO2013168105A1
WO2013168105A1 PCT/IB2013/053696 IB2013053696W WO2013168105A1 WO 2013168105 A1 WO2013168105 A1 WO 2013168105A1 IB 2013053696 W IB2013053696 W IB 2013053696W WO 2013168105 A1 WO2013168105 A1 WO 2013168105A1
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WO
WIPO (PCT)
Prior art keywords
downlink
uplink
defining
frame
transmission
Prior art date
Application number
PCT/IB2013/053696
Other languages
English (en)
Inventor
Anna Pantelidou
Timo Koskela
Sami-Jukka Hakola
Samuli Turtinen
Original Assignee
Renesas Mobile Corporation
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 Renesas Mobile Corporation filed Critical Renesas Mobile Corporation
Publication of WO2013168105A1 publication Critical patent/WO2013168105A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • 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

Definitions

  • the present invention relates to methods, apparatus and computer program for configuring wireless transmissions.
  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication.
  • the invention relates to full-duplex communication by a node of a communications network.
  • Wireless communication such as communication over wireless local area networks
  • the increasing popularity and wider use of wireless networking places increasing demands on the infrastructure and radio resources used for wireless networking.
  • the radio resources used for wireless networking are increasingly being put to other uses, so that wireless networking needs to share radio resources with more and more applications. Any increase in efficiency in the use of wireless networking infrastructure and radio resources is therefore highly desirable. Similar considerations apply to other wireless communication mechanisms.
  • apparatus for use in a wireless network access point, the apparatus comprising a processing system constructed and arranged to cause the apparatus to perform actions comprising at least: defining a transmit opportunity for a wireless network station, wherein the transmit opportunity comprises at least one uplink frame for an uplink transmission by the station to the access point; and if the access point has data for the wireless network station, configuring at least one downlink frame for downlink transmission from the access point to the wireless network station, wherein the downlink frame is configured so that the uplink and the downlink transmissions occur simultaneously.
  • the processing system may comprise at least one processor and memory storing computer program code, the computer program code being configured to, with the memory and the at least one processor, cause the apparatus to perform actions as described above.
  • a method comprising: configuring at least one processor to cause an apparatus to perform actions comprising at least: defining a transmit opportunity for a wireless network station, wherein the transmit opportunity comprises at least one uplink frame for an uplink transmission by the station to the access point; and if the access point has data for the wireless network station, configuring at least one downlink frame for downlink transmission from the access point to the wireless network station, wherein the downlink frame is configured so that the uplink and the downlink transmissions occur simultaneously.
  • a computer program comprising instructions, execution of which by a processor configures an apparatus to perform actions comprising at least: defining a transmit opportunity for a wireless network station, wherein the transmit opportunity comprises at least one uplink frame for an uplink transmission by the station to the access point; and if the access point has data for the wireless network station, configuring at least one downlink frame for downlink transmission from the access point to the wireless network station, wherein the downlink frame is configured so that the uplink and the downlink transmissions occur simultaneously.
  • the computer program may be provided as a computer readable medium for use in a wireless network access point and which stores the program of instructions.
  • a method of configuring wireless transmissions comprising: defining a transmit opportunity for a wireless network station, wherein the transmit opportunity comprises at least one uplink frame for an uplink transmission by the station to a wireless network access point; and if the access point has data for the wireless network station, configuring at least one downlink frame for downlink transmission from the access point to the wireless network station, wherein the downlink frame is configured so that the uplink and the downlink transmissions occur simultaneously.
  • Fig. 1 shows schematically an example of a wireless network according to an embodiment of the present invention
  • Fig. 2 shows a diagram showing an example of communication intervals defined according to an embodiment of the present invention
  • Fig. 3 shows a diagram showing an example of communication between network elements according to an embodiment of the present invention.
  • Fig. 4 shows schematically an example of a process according to an embodiment of the present invention. Detailed Description
  • Examples of embodiments of the present invention recognise that wireless networking, like most wireless applications, involves uplink transmissions and downlink transmissions. Naturally, simultaneous uplink and downlink transmission on the same frequency and at the same time can increase efficiency in the use of infrastructure and resources.
  • Examples of embodiments of the present invention provide mechanisms for full duplex transmission by a wireless network access point. That is, examples of embodiments of the invention allow for downlink transmission by an access point while a wireless network station is engaged in uplink transmission to the access point.
  • the discussion below is primarily in the context of wireless networking conducted under the 802.11 standard, but it will be recognised that this discussion is exemplary and non-limiting, and that any number of mechanisms for scheduled transmissions from one communications node to another may use embodiments of the present invention in licensed or unlicensed spectrum.
  • a receiving node to which full- duplex transmission and reception is available is thus able to use embodiments of the present invention to transmit and receive at the same time.
  • An 802.11 wireless network typically comprises at least one access point (AP) serving one or more stations (STAs), using radio resources that may be shared with other wireless networks and with a variety of other users.
  • Wireless networks typically operate according to protocols designed to prevent any one user from monopolising the available resources.
  • Possible modes of operation for wireless networks include a hybrid coordination function (HCF) and a point coordination function (PCF).
  • HCF hybrid coordination function
  • PCF point coordination function
  • the PCF and the HCF modes of operation include a contention free period (CFP) and a contention period (CP).
  • CPF contention free period
  • CP contention period
  • the AP is able to take control of a wireless channel for its own traffic and also to schedule transmission from STAs.
  • Fig. 1 illustrates schematically an example of a wireless network 100 according to one or more embodiments of the present invention.
  • the network 100 comprises an access point (AP) 102 and stations (STAs) 104A-104C.
  • the AP 102 and STAs 104A-104C may operate in HCF mode.
  • HCF mode the STAs are allowed a period of time, called a transmit opportunity (TXOP), to transmit to the AP.
  • TXOP transmit opportunity
  • a TXOP is defined by its starting time and its maximum duration.
  • the TXOPs given to STAs by the AP during controlled channel access are called HCF controlled channel access (HCCA) TXOPs, or polled TXOPs.
  • HCCA HCF controlled channel access
  • a STA can transmit multiple frames as long as the maximum duration of the TXOP is not exceeded.
  • Each contention free period begins after a beacon frame, and extends for the duration specified in a delivery traffic indication message (DTIM).
  • DTIM indicates the client stations (STAs) that are currently in low-power mode that have data buffered on the access point awaiting pickup.
  • STAs 104B and 104C may include similar elements as those described with respect to the STA 104A.
  • the AP 102 may comprise a transmitter 106, receiver 108, radio controller 110, and antennas 112A and 112B.
  • the AP 102 may further comprise a processor 114, memory 116, and storage 1 18, communicating with one another and with the radio controller over a bus 120.
  • the AP 102 may further comprise data 122 and programs 124, suitably residing in storage 118 and transferred to memory 116 as needed for use by the processor 114.
  • the STA 104A may comprise a transmitter 130, receiver 132, radio controller
  • the STA 104A may further comprise a processor 138, memory 140, and storage 142, communicating with one another and with the radio controller over a bus 144.
  • the AP 102 may further comprise data 146 and programs 148, suitably residing in storage 142 and transferred to memory 140 as needed for use by the processor 138.
  • any or all of the STAs 104A-104C and other similar devices may be implemented as any device capable of engaging in wireless network communication.
  • a cellular telephone or other mobile communication device may be equipped to operate in a cellular network and may simultaneously be equipped and configured to operate as a wireless network station, and may employ one or more embodiments of the present invention.
  • a mobile communication device that may employ one or more embodiments of the present invention is a user equipment (UE).
  • UE user equipment
  • the term "user equipment” refers to a device capable of performing data processing and wireless communication.
  • User equipment include devices that use a subscriber identification module (SIM), and also include devices that carry out wireless communication without the use of a SIM.
  • SIM subscriber identification module
  • User equipment may include, but are not limited to, the following types of devices: mobile phone, smartphone, personal digital assistant (PDA), tablet computer, laptop computer, camera, notebook computer, portable game console, and electronic reader.
  • PDA personal digital assistant
  • a UE may, but need not be, a portable device, and other examples of UEs include tower computers, in- ho me game consoles, network equipped disc players, audio receivers, media servers, and television sets.
  • Fig. 2 illustrates a diagram 200 illustrating an example of the generation of contention free periods.
  • the diagram 200 illustrates the relative timing of different events, including frames 202A-202H, contention free periods 204A and 204B, and a contention period 206.
  • One or more beacons transmitted before the CFP include information defining the remaining CFP value, as can be seen with respect to the frames 202A, 202B, and 202C.
  • the contention period 206 begins after the contention free period 204A but this is non- limiting and the contention period may be configured to precede the contention free period .
  • the AP transmits during an HCCA TXOP if it has data to send in the downlink.
  • the AP 102 synchronises its downlink transmission with the uplink transmission from a STA with which it is communicating.
  • the AP 102 waits during the interval defined by the short interframe space (SIFS) and then transmits in the downlink again, to the same STA.
  • SIFS short interframe space
  • the AP 102 may, after the SIFS, transmit to another STA in the downlink, providing that the communication requirements of the network 100 allow for receiving from one STA and transmitting to a different STA using full duplex mode.
  • Fig. 3 illustrates details of an example of a contention free period 300 according to an embodiment of the present invention.
  • a TXOP 302 for transmission by a STA to an AP is defined for the contention free period 300.
  • the TXOP 302 comprises uplink frames 304A, 304B, 304C, and 304D, and downlink frames 306A, 306B, 306C, and 306D.
  • An uplink frame and its corresponding downlink frame occupy the same duration, and pairs of corresponding frames are separated by SIFS intervals 308A, 308B, and 308C.
  • the AP is operating in a full- duplex mode, in which it transmits data to the STA on the downlink while receiving data from the STA on the uplink.
  • Use of the full-duplex mode by the AP may be specified by elements of a traffic indication map (TIM), which may indicate data to be transmitted by the AP and the STA or STAs to which the data is to be directed. If the TIM indicates that the AP has data to transmit, the AP may perform downlink transmissions simultaneously with uplink transmissions from the STA.
  • a contention period will begin, similarly to the scenario illustrated above in Fig. 2. After the contention period, a new CFP will begin, with the scheduling of an STA and the operation of the AP defined, for example, by a traffic indication map indicating the traffic demands for a new TXOP.
  • the AP schedules uplink transmissions by the STA and performs downlink transmissions to the same STA during the time scheduled for uplink transmissions by the STA. For example, during the frame 306A, uplink data Ul is transmitted by the STA and downlink data Dl is transmitted by the AP. After an SIFS interval 308A, the frames 304B and 306B begin. Data U2 is transmitted by the STA and data D2 is transmitted by the AP. In addition to transmitting data during the frame 306B, the AP may transmit an acknowledgement that data Ul was received, and the STA may transmit an acknowledgement that data Dl was received.
  • acknowledgement frames may similarly be sent in the uplink and the downlink.
  • Dz indicates the z ' th downlink frame from the AP and Uz indicates the z ' th uplink frame from an STA.
  • Acku(i) is the acknowledgement of the z ' th uplink transmission and Ackofi) is the acknowledgement of the z ' th downlink transmission.
  • data and acknowledgement fields are specified in each frame.
  • acknowledgement fields need not appear in every frame.
  • a single block acknowledgement may be sent, in order to acknowledge all frames in the TXOP. In this configuration, only data need be sent. It will also be recognised that the AP will not always have data to transmit and the STA may send data in an uplink frame without a need to transmit data in the downlink frame.
  • the AP disables the full-duplex mode if it has no data. In at least one other embodiments of the invention, the AP disables the full-duplex mode if no data is received from the STA within a specified time from a particular event. In the case in which the AP receives no data from the STA, the TXOP may be truncated and a new TXOP granted to another STA.
  • embodiments may be designed wherein the full- duplex mode is disabled if either the AP has no data or no data is received from the STA.
  • the AP may assume that the STA has no more data, and may truncate the TXOP. Such an occurrence may result in the loss of the contention free end frame (CF-End frame) of the TXOP, or of a data frame of the TXOP.
  • the STA or AP may detect that it has no data to send during the CF period and may explicitly indicate that it has no more data. Such an indication may be delivered by including an explicit "no more data" indication in the last frame in which data is transmitted. If the STA indicates that it has no data to send, a CF-End is sent individually to indicate termination of the TXOP.
  • the HCCA coordinate data uplink and downlink frame durations.
  • Frame durations for uplink and downlink data may be equal based on queue size at the STA and the TXOP duration. If the STA or AP cannot fill the indicated frame by multiplexing several media access control (MAC) frames and acknowledgements (ACKs) or adjusting the MCS, padding is used to reach a target length for the frame. In this way, the duration of the AP transmission and the STA transmission can be equalised, allowing for coordination of the SIFS periods for the STA and the AP.
  • the HCCA allows dynamic adjustment of frame duration.
  • the frame duration is determined by the duration of the longer transmission.
  • the duration of the SIFS period is determined following the termination of the longer duration transmission.
  • the AP attempts to synchronise its transmissions to those of the STA. Therefore, in one or more embodiments of the invention, the AP is provided with information indicating the duration of the transmission frames.
  • frame duration information can be included in the media access control (MAC) header.
  • the MAC header may include information regarding the length of the y ' th frame in the future that a STA will generate. For example, the value of j may be 0 to indicate the current frame, 1 to indicate the next frame, 2 to indicate 2 frames in the future, and so on.
  • frame duration information can be included in the PHY header.
  • the PHY header can include information regarding the length of the y ' th frame in the future that a ST A can generate.
  • the AP can synchronise its own transmission by choosing its MCS and frame lengths appropriately. It is possible that the beginning of the uplink and the downlink transmissions will not be synchronised. For example, the downlink may start after being shifted by a time needed to decode header information. However, because the AP is aware of the duration of the STA's uplink transmission, and because it knows the time shift for the downlink, the AP will know the starting time of the downlink and the finishing time of the uplink, and can coordinate the duration of the downlink to end at the same time as the uplink. The AP downlink and the STA uplink can therefore be coordinated to finish at the time when the SIFS will be measured.
  • the AP may fragment its data so as to transmit its data in multiple smaller frames. If the STA indicates a frame length that is longer than the AP's intended frame length, the AP may pad its frame accordingly.
  • Fig. 4 illustrates schematically an example of a process 400 of wireless networking communication according to an embodiment of the present invention.
  • a wireless network access point configures a contention free period.
  • the configuration may specify behaviour of the access point during the contention free period, as well as scheduling for STAs and frame and SIFS duration and adjustment occurring during the contention free period.
  • the access point configures a transmit opportunity for a wireless network station (STA), specifying the specific STA that is to be allowed to transmit, and scheduling information for the transmission.
  • Configuration of the transmit opportunity may also specify characteristics and use of frames that may be used simultaneously by the AP and the STA for downlink and uplink transmission, respectively.
  • the frames may be specified so that uplink and downlink frames end at the same time and allow for simultaneous and equal SIFS durations between frames.
  • configuration information may specify that frames are equal in duration, or alternatively may specify that frames may be variable based on particular choices and conditions.
  • an uplink frame may be extended to match the duration of its corresponding downlink frame, or vice versa. Such an extension may be performed during the actual transmission of the longer frame.
  • configuration information may specify that the access point will synchronise the duration of its downlink frame to the duration of the STA's uplink frame, based on information provided by the STA.
  • Configuration of the TXOP may also specify the behaviour of the AP during the TXOP.
  • the AP may be configured not to transmit in a downlink frame if it has no data to transmit, or may alternatively or in addition be configured not to transmit, and to truncate the TXOP, if it receives no transmission from the STA within a specified time.
  • one or both of the AP and the STA may be configured to specifically signal to the other that it has no data to transmit, and the AP may also be configured to send an indication ending a contention free period.
  • the access point transmits a beacon signal, which may provide configuration information indicating the configuration of the TXOP, and the behaviour specified for the STA and the AP.
  • the beacon signal is transmitted before the contention- free period or during the contention period, and defines the behaviour of the AP and STA during the following contention- free and contention periods respectively.
  • the STA and the AP communicate in frames of the TXOP, as specified in the configuration of the TXOP.
  • the AP and STA may communicate in uplink and downlink frames when the AP has data to transmit, and the frame durations may be configured as specified.
  • Both the AP and the STA may send an acknowledgement signal after every data frame that is successfully received, or, depending on the specified configuration, may indicate acknowledgement in other ways, such as sending a single acknowledgement signal at the end of the TXOP.
  • the process may return to step 404 and another TXOP may be configured. If the contention period has ended, the process proceeds to step 410, and the AP performs operations typical of those subsequent to a contention- free period, such as entering a contention period or other operations.

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

Abstract

L'invention porte sur des systèmes et des techniques pour configurer des transmissions sans fil, en particulier afin de réaliser un réseautage sans fil à transmission bidirectionnelle simultanée entre un point d'accès de réseau sans fil et une station de réseau sans fil. Un point d'accès configure une opportunité d'émission (302) dans une période sans conflit (300) afin d'assurer un mode bidirectionnel simultané, comprenant au moins une trame de liaison montante (304A) pour une émission par une station et au moins une trame de liaison descendante (306A) pour une émission par le point d'accès. Le mode de liaison montante et le mode de liaison descendante permettent une transmission simultanée. L'opportunité d'émission (302) peut être configurée de manière que des trames de liaison montante (304) et leurs trames de liaison descendante correspondantes (306) soient de durées égales, soit par configuration des trames pour qu'elles soient de durées égales soit par ajustement des durées de trame durant l'émission.
PCT/IB2013/053696 2012-05-09 2013-05-08 Procédés, appareil et programme informatique pour configurer des transmissions sans fil WO2013168105A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1208098.2A GB2501898A (en) 2012-05-09 2012-05-09 Simultaneous transmission of uplink and downlink data in a wireless network
GB1208098.2 2012-05-09

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WO2013168105A1 true WO2013168105A1 (fr) 2013-11-14

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