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WO2010110619A2 - Procédé et appareil de planification de ressources de support sans fil - Google Patents

Procédé et appareil de planification de ressources de support sans fil Download PDF

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Publication number
WO2010110619A2
WO2010110619A2 PCT/KR2010/001859 KR2010001859W WO2010110619A2 WO 2010110619 A2 WO2010110619 A2 WO 2010110619A2 KR 2010001859 W KR2010001859 W KR 2010001859W WO 2010110619 A2 WO2010110619 A2 WO 2010110619A2
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station
downlink
downlink transmission
time
spatial stream
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WO2010110619A3 (fr
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Yongho Seok
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access

Definitions

  • the present invention relates to wireless communications, and more particularly, to a method and apparatus for scheduling a radio medium access time and a resource allocated for access and for transmitting a data frame according to the scheduling.
  • WLAN wireless local area network
  • PDA personal digital assistant
  • PMP portable multimedia player
  • the IEEE 802.11 is developing or commercializing standards of various technologies such as quality of service (QoS) improvement, access point protocol compatibility, security enhancement, radio resource measurement, wireless access in vehicular environments, fast roaming, mesh networks, inter-working with external networks, wireless network management, etc.
  • QoS quality of service
  • the IEEE 802.1 Ib supports a data rate of up to 11 Mbps by using a frequency band of 2.4 GHz.
  • the IEEE 802.1 Ia commercialized after the IEEE 802.1 Ib uses a frequency band of 5 GHz instead of the frequency band of 2.4 GHz and thus significantly reduces influence of interference in comparison with the very congested frequency band of 2.4 GHz.
  • the IEEE 802.1 Ia has improved the data rate to up to 54 Mbps by using the OFDM technology.
  • the IEEE 802. l la has a shorter communication distance than the IEEE 802.1 Ib.
  • the IEEE 802.1 Ig implements the data rate of up to 54 Mbps by using the frequency band of 2.4 GHz. Due to its backward compatibility, the IEEE 802.1 Ig is drawing attention, and is advantageous over the IEEE 802.1 Ia in terms of the communication distance.
  • the IEEE 802.1 In is a technical standard relatively recently introduced to overcome a limited data rate which has been considered as a drawback in the WLAN.
  • the IEEE 802.1 In is devised to increase network speed and reliability and to extend an operational distance of a wireless network. More specifically, the IEEE 802.1 In supports a high throughput (HT), i.e., a data processing rate of up to 540 Mbps or higher, and is based on a multiple input and multiple output (MIMO) technique which uses multiple antennas in both a transmitter and a receiver to minimize a transmission error and to optimize a data rate.
  • HT high throughput
  • MIMO multiple input and multiple output
  • this standard may use a coding scheme which transmits several duplicate copies to increase data reliability and also may use the OFDM to support a higher data rate.
  • a basic access mechanism of an IEEE 802.11 medium access mechanism is a carrier sense multiple access with collision avoidance (CSMA/CA) combined with binary exponential backoff.
  • the CSMA/CA mechanism is also referred to as a distributed coordinate function (DCF) of the IEEE 802.11 MAC, and basically employs a "listen before talk" access mechanism.
  • DCF distributed coordinate function
  • a station STA listens a wireless channel or medium before starting transmission. As a result of listening, if it is sensed that the medium is not in use, a listening STA starts its transmission. Otherwise, if it is sensed that the medium is in use, the STA does not start its transmission but enters a delay period determined by a binary exponential backoff algorithm.
  • the CSMA/CA mechanism also includes virtual carrier sensing in addition to physical carrier sensing in which the STA directly listens the medium.
  • the virtual carrier sensing is designed to compensate for a limitation in the physical carrier sensing such as a hidden node problem.
  • the IEEE 802.11 MAC uses a network allocation vector (NAV).
  • the NAV is a value transmitted by an STA, currently using the medium or having a right to use the medium, to anther STA to indicate a remaining time before the medium returns to an available state. Therefore, a value set to the NAV corresponds to a period reserved for the use of the medium by an STA transmitting a corresponding frame.
  • One of procedures for setting the NAV is a exchange procedure of a request to send (RTS) frame and a clear to send (CTS) frame.
  • the RTS frame and the CTS frame include information capable of delaying frame transmission from receiving STAs by reporting upcoming frame transmission to the receiving STAs.
  • the information may be included in a duration filed of the RTS frame and the CTS frame.
  • a power save multi-poll (PSMP) protocol is specified in the IEEE 802.1 In standard.
  • a high throughput (HP) access point (AP) allocates a downlink transmission time (DTT) and an uplink transmission time (UTT) to respective HT non-AP STAs (hereinafter, also referred to as HT STAs) or HT STAs of a specific group, and the HT STA communicates with the HP AP during only a DTT and UTT allocated to the HT STA itself.
  • DTT downlink transmission time
  • UTT uplink transmission time
  • the AP can sequentially transmit a data frame or the like to respective different STAs or STAs of a specific group without a contention overhead. Further, the STAs can also transmit a data frame or the like to the AP without a contention overhead. Therefore, the PSMP protocol can reduce each HT STA' s overhead caused by the CSMA/CA channel access mechanism. In addition, according to the PSMP protocol, each HT STA can enter a power save mode or a doze state if it is not a time allocated to the HT STA itself, and thus unnecessary power consumption resulted from overhearing or the like can be further reduced.
  • an IEEE 802. Hn medium access control (MAC)/physical layer (PHY) protocol is not effective to provide a throughput of 1 Gbps or higher.
  • the IEEE 802.1 In MAC/PHY protocol is designed for an operation of an STA, that is, an STA having one network interface card (NIC), and thus when a frame throughput is increased while conforming to the conventional IEEE 802.1 In MAC/PHY protocol, a resultant additional overhead is also increased. Consequently, there is a limitation in increasing a throughput of a wireless communication network while conforming to the conventional IEEE 802.1 In MAC/PHY protocol, that is, a single STA architecture.
  • VHT very high throughput
  • SAP MAC service access point
  • the PSMP protocol of the IEEE 802.1 In when the PSMP protocol of the IEEE 802.1 In is directly applied, there is a problem in that all of the available PHY interfaces cannot be effectively used even if the DTT or the UTT is allocated to an STA supporting MIMO.
  • the number of all of the available PHY interfaces of the AP is grater than the number of available PHY interfaces of the STA.
  • the PSMP protocol of the IEEE 802.1 In when the PSMP protocol of the IEEE 802.1 In is directly applied, the relatively grater number of PHY interfaces of the AP may use only one STA.
  • the PHY interfaces of the AP need to be all used since the STA transmits or receives a large amount of data.
  • the amount of data transmitted or received by the STA may not be large, and in this case, if all PHY interfaces are used by the STA alone, the radio resource cannot be used not only in an effective manner but also in an adaptive and active manner.
  • the present invention provides a method of dynamically distributing a physical layer (PHY) interface of an access point (AP) to stations to optimize resource utilization in a wireless local area network (WLAN) system, and a wireless apparatus for supporting the method.
  • PHY physical layer
  • WLAN wireless local area network
  • the method includes transmitting, to a first station, first downlink transmission time information indicating a time scheduled for first downlink transmission for transmitting a data frame to the first station, and transmitting second downlink transmission time information indicating a time scheduled for second downlink transmission for transmitting a data frame to a second station,wherein first downlink spatial stream information indicating the number of spatial streams allocated for the first downlink transmission is transmitted to the first station, second downlink spatial stream information indicating the number of spatial streams allocated for the second downlink transmission is transmitted to the second station, and the time scheduled for the first downlink transmission is equal to the time scheduled for the second downlink transmission.
  • the first downlink transmission time information and the first downlink spatial stream information may be transmitted to the first station by using a first frame, and the second downlink transmission time information and the second downlink spatial stream information may be transmitted to the second station by using a second frame.
  • the first downlink transmission time information and the first downlink spatial stream information and the second downlink transmission time information and the second downlink spatial stream information may be transmitted by using a station information field of a power save multi-poll (PSMP) frame, and the PSMP frame may be multicast to the first station and the second station.
  • PSMP power save multi-poll
  • the first station may wake up from a doze state of a power save mode at a time indicated by the first downlink transmission time information to receive the first downlink transmission performed by an access point(AP), and may return to the doze state at the completion of the first downlink transmission, and
  • the second station may wake up from the doze state at a time indicated by the second downlink transmission time information to receive the second downlink transmission performed by the AP, and return to the doze state at the completion of the second downlink transmission.
  • the method includes transmitting, to a first station, first uplink transmission time information indicating a time scheduled for first uplink transmission for transmitting a data frame by the first station to an access point (AP), and transmitting second uplink transmission time information indicating a time scheduled for second uplink transmission for transmitting a data frame by a second station to the AP, wherein first uplink spatial stream information indicating the number of spatial streams allocated for the first uplink transmission is transmitted to the first station, second uplink spatial stream information indicating the number of spatial streams allocated for the second uplink transmission is transmitted to the second station, and the time scheduled for the first uplink transmission is equal to the time scheduled for the second uplink transmission.
  • the first uplink transmission time information and the first uplink spatial stream information may be transmitted to the first station by using a first frame, and the second uplink transmission time information and the second uplink spatial stream information may be transmitted to the second station by using a second frame.
  • the first downlink transmission time information and the first downlink spatial stream information and the second downlink transmission time information and the second downlink spatial stream information may be transmitted by using a station information field of a power save multi-poll (PSMP) frame, and the PSMP frame may be multicast to the first station and the second station.
  • PSMP power save multi-poll
  • the first station may wake up from a doze state of a power save mode at a time indicated by the first uplink transmission time information to receive the first uplink transmission performed by the AP, and return to the doze state at the completion of the first uplink transmission, and wherein the second station may wake up from the doze state at a time indicated by the second uplink transmission time information to receive the second uplink transmission performed by the AP, and return to the doze state at the completion of the second uplink transmission.
  • the method includes receiving downlink transmission time information indicating a time scheduled for downlink transmission for receiving a data frame from an access point (AP) and uplink transmission time information indicating a time scheduled for uplink transmission for transmitting a data frame to the AP, receiving downlink spatial stream information indicating the number of spatial streams allocated for the downlink transmission and uplink spatial stream information indicating the number of spatial streams allocated for the uplink transmission, and receiving a data frame by using the allocated spatial stream indicated by the downlink spatial stream information at a time indicated by the downlink transmission time information, and transmitting a data frame by using the allocated spatial stream indicated by the uplink spatial stream information at a time indicated by the uplink transmission time information.
  • AP access point
  • the station operates in a power save mode, may wake up from a doze state at the time indicated by the downlink transmission time information or the time indicated by the uplink transmission time information to transmit a frame, and return to the doze state at the completion of the time indicated by the downlink transmission time information or the time indicated by the uplink transmission time information.
  • a station for performing an operation by accessing a channel in a wireless local area network (WLAN) system.
  • the station includes a transceiver, and a processor operationally coupled to the transceiver, wherein the processor is configured for: receiving downlink transmission time information indicating a time scheduled for downlink transmission for receiving a data frame from an access point (AP) and uplink transmission time information indicating a time scheduled for uplink transmission for transmitting a data frame to the AP, receiving downlink spatial stream information indicating the number of spatial streams allocated for the downlink transmission and uplink spatial stream information indicating the number of spatial streams allocated for the uplink transmission, and receiving a data frame by using the allocated spatial stream indicated by the downlink spatial stream information at a time indicated by the downlink transmission time information, and transmitting a data frame by using the allocated spatial stream indicated by the uplink spatial stream information at a time indicated by the uplink transmission time information.
  • AP access point
  • uplink transmission time information indicating a time scheduled for uplink transmission for transmitting a data frame to
  • downlink transmission or uplink transmission can be performed simultaneously by respective stations in a wireless local area network (WLAN) system, and physical layer (PHY) interfaces of an access point (AP) can be used by adaptively dividing the interfaces, thereby improving usage efficiency of a radio resource.
  • WLAN wireless local area network
  • PHY physical layer interfaces of an access point
  • FIG. 1 is a schematic view showing an exemplary structure of a wireless local area network (WLAN) system to which an embodiment of the present invention can be applied.
  • WLAN wireless local area network
  • FIG. 2 shows an example of a power save multi-poll (PSMP) operation in a wireless WLAN system according to an embodiment of the present invention.
  • PSMP power save multi-poll
  • FIG. 3 shows some constitutional elements included in a PSMP frame that can be used in a PSMP procedure of a WLAN system according to an embodiment of the present invention.
  • FIG. 4 shows an exemplary format of a PSMP header field.
  • FIG. 5 shows an exemplary format of a PSMP STA info field.
  • FIG. 6 shows an exemplary PSMP frame format for a space division PSMP according to an embodiment of the present invention.
  • FIG. 7 is a diagram showing an example of distributing a physical layer (PHY) interface.
  • PHY physical layer
  • FIG. 8 is a block diagram showing a wireless apparatus for implementing an embodiment of the present invention. Mode for the Invention
  • Embodiments of the present invention described below can be effectively applied to a very high throughput (VHT) wireless local area network (WLAN) system operating in a band of 60 GHz.
  • VHT very high throughput
  • WLAN wireless local area network
  • the present invention is not limited thereto.
  • the embodiments of the present invention can be also equally applied to a VHT WLAN system operating in a band of 6 GHz or lower.
  • FIG. 1 is a schematic view showing an exemplary structure of a WLAN system to which an embodiment of the present invention can be applied.
  • the WLAN system includes one or more basis service sets (BSSs).
  • the BSS is a set of stations (STAs) which are successfully synchronized to communicate with one another, and is not a concept indicating a specific region.
  • the BSS can be classified into an infrastructure BSS and an independent BSS (IBSS).
  • the infrastructure BSS is shown in FIG. 1.
  • Infrastructure BSSs i.e., BSSl and BSS2
  • STAs i.e., STAl, STA3, and STA4
  • APs access points
  • DS distribution system
  • the IBSS does not include APs, and thus all STAs are mobile STAs.
  • the IBSS constitutes a self- contained network since connection to the DS is not allowed.
  • the STA is an arbitrary functional medium including a medium access control
  • a VHT STA is defined as an STA that supports super high-rate data processing of 1 GHz or higher in the multi-channel environment to be described below.
  • STAs included in the BSS may be all VHT STAs, or a VHT STA and a legacy STA (i.e., IEEE 802.1 In-based HT STA) may coexist.
  • non-AP STAs are portable terminals operated by users.
  • a non-AP STA may be simply referred to as an STA.
  • the non-AP STA may also be referred to as a wireless transmit/ receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, a mobile subscriber unit, etc.
  • WTRU wireless transmit/ receive unit
  • UE user equipment
  • MS mobile station
  • a non-AP VHT-STA (or simply a VHT STA) is defined as a non-AP STA that supports the super high-speed data processing of 1 GHz or higher in the multi-channel environment to be described below.
  • the AP (i.e., API and AP2) is a functional entity for providing connection to the DS through a wireless medium for an associated STA.
  • the AP may also be referred to as a centralized controller, a base station (BS), a node-B, a base transceiver system (BTS), a site controller, etc.
  • BS base station
  • BTS base transceiver system
  • a VHT AP is defined as an AP that supports the super high-speed data processing of 1 GHz or higher in the multi-channel environment to be described below.
  • a plurality of infrastructure BSSs can be interconnected by the use of the DS.
  • An extended service set (ESS) is a plurality of BSSs connected by the use of the DS. STAs included in the ESS can communicate with one another. In the same ESS, a non-AP STA can move from one BSS to another BSS while performing seamless communication.
  • the DS is a mechanism whereby one AP communicates with another AP. By using the DS, an AP may transmit a frame for STAs associated with a BSS managed by the AP, or transmit a frame when any one of the STAs moves to another BSS, or transmit a frame to an external network such as a wired network.
  • the DS is not necessarily a network, and has no limitation in its format as long as a specific distribution service specified in the IEEE 802.11 can be provided.
  • the DS may be a wireless network such as a mesh network, or may be a physical structure for interconnecting APs.
  • the AP may use a space division multiple access (SDMA) mechanism. That is, transmission and reception are allowed to be performed simultaneously by the several STAs and the AP.
  • SDMA space division multiple access
  • the number of spatial streams that can be simultaneously received by the AP may be limited by the number of available PHY interfaces of the AP. Further, the number of spatial streams transmitted by each STA may need to be controlled by the AP according to load balance and priority of a plurality of pieces of uplink traffic. For this, a method of assigning the number of spatial streams to be allocated to each STA and for reporting this number to each STA is proposed.
  • the AP having a plurality of PHY interfaces adaptively distributes/allocates to STAs a spatial stream that can be used for data transmission, and the STAs communicate with the AP by using the allocated spatial stream.
  • the AP may transmit, to each STA, information indicating the number of available spatial streams and information indicating the number of spatial streams allocated to each STA.
  • a frame containing the information indicating the number of spatial streams allocated to each STA may be an IEEE 802.11 standard's control frame, management frame, and data frame or may be an additional management frame for delivering information indicating the number of spatial streams additionally allocated. These frames may be individually transmitted to each STA or may be multicast/broadcast.
  • the PHY interfaces need to be dynamically distributed to each STA.
  • the AP in order for the 4 STAs to simultaneously communicate with the AP, the AP has to allow the STAs to use only 2 PHY interfaces. This is because the AP having the 8 PHY interfaces supports up to 8 spatial streams by using SDMA. In this case, by collectively considering an AC category to be transmitted by each STA and the number of contenting STAs, the AP may allocate a maximum number of spatial streams that can be used by each STA for data transmission and then may transmit this number to each STA.
  • a power save multi-poll (PSMP) frame of the IEEE 802.11 standard may be used as an example of a frame to be used.
  • the PSMP frame according to the embodiment of the present invention further includes a subframe containing information indicating the number of spatial streams allocated to each STA at the DTT and the UTT. This will be described below in detail together with a frame structure.
  • FIG. 2 shows an example of a PSMP operation in a wireless WLAN system according to an embodiment of the present invention.
  • the PSMP operation includes a PSMP frame transmission phase 200, a downlink (DL) phase 210, and an uplink (UL) Phase 220.
  • the PSMP operation can be expressed with a PSMP sequence.
  • the PSMP sequence denotes a sequence of which a first frame is a PSMP frame followed by zero or more frames transmitted at a PSMP-downlink transmission time (DTT) and followed by zero or more frames transmitted at a PSMP uplink transmission time (UTT).
  • DTT PSMP-downlink transmission time
  • UTT PSMP uplink transmission time
  • an AP multicasts/broadcasts a PSMP frame 205. That is, a first frame of the PSMP sequence is a PSMP frame, and a destination address (DA) or a receiving address (RA) of the PSMP frame is a specific group address.
  • the PSMP frame 205 is an action frame transmitted by the AP to a specific group of STAs, and may include information on a DTT in the DL phase 210 and information on a UTT in the UL phase 220, that is, information indicating to which STAs the DTT is allocated and to which STAs the UTT is allocated.
  • the PSMP frame includes information indicating that a DTTl and a DTT2 of the DL phase are allocated respectively to an STAl and an ST A2, and a UTTl and a UTT2 of the UL phase are allocated respectively to the STAl and the STA2.
  • the PSMP frame may include information indicating the number of radio resources allocated to the DTT and/or UTT, that is, the number of available spatial streams, which will be described below.
  • the DL phase 210 starts after a specific frame interval (e.g., a reduced inter-frame spacing (RIFS) 250).
  • RIFS reduced inter-frame spacing
  • the STAl transitions to an awake state in a DTTl 211 to receive data transmitted from the AP.
  • the STAl can enter a doze state.
  • the STA2 transitions to the awake state in a DTT2 212 to receive data transmitted from the AP.
  • the STA2 can return to the doze state.
  • the UL phase 220 starts.
  • the STAl first transitions to the awake state to transmit data to the AP.
  • the STAl can return to the doze state.
  • the STA2 transitions to the awake state to transmit data to the AP.
  • the STA2 can return to the doze state.
  • FIG. 3 shows some constitutional elements included in a PSMP frame that can be used in a PSMP procedure of a WLAN system according to an embodiment of the present invention.
  • the PSMP frame includes a 'frame control + duration' field 310, a receiver address (RA) field 320, a transmitter address (TA) field 330, a BSS identifier (ID) field 340, a management action header (simply, mgmt action header) field 350, a PSMP header field 360, N pieces of PSMP station information (simply, PSMP STA info) field 370, and a cyclic redundancy check (CRC) field 380.
  • RA receiver address
  • TA transmitter address
  • ID BSS identifier
  • the 'frame control + duration' field 310 includes duration information for configuring a network allocation vector (NAV) with respect to a neighboring STA together with a variety of information required to control a management action frame.
  • Information for frame control includes a protocol version, a type and subtype, 'To DA', 'From DS', power management, etc., for exemplary purposes only.
  • the type of the PSMP frame may be a management frame, and the subtype thereof may be an action frame.
  • the RA field 320 is for specifying a receiving STA of the PSMP frame.
  • the RA or a destination address (DA) may be specified to a specific group address or may be set to a broadcast address.
  • the TA field 330 may be set to an address of a VHT AP for transmitting the PSMP frame.
  • the BSSID field 340 is set to a value indicating an ID of a BSS managed by the VHT AP for transmitting the PSMP frame.
  • the mgmt action header field 340 may include information other than the aforementioned information included in a header part of the mgmt action field, and is also referred to as a PSMP parameter set field.
  • the mgmt action header field defines the number of PSMP STA info fields included in the PSMP frame, and indicates whether the PSMP frame is followed by an additional PSMP frame. Further, the mgmt action header field is used to indicate a duration of the PSMP sequence.
  • FIG. 4 shows an exemplary format of the PSMP header field 360.
  • the PSMP header field 360 includes an STA number (simply, N_STA) subfield 410 indicating the number of PSMP STA info fields existing in the PSMP frame including the PSMP header field 360, a more PSMP indicator subfield 420 indicating whether the PSMP frame is followed by another PSMP frame, and a PSMP sequence duration subfield 430 indicating a duration of the PSMP frame.
  • STA number implies, N_STA
  • FIG. 5 shows an exemplary format of the PSMP STA info field 370.
  • the PSMP STA info field 370 of FIG. 5 relates to a conventional individually addressed case, and may include zero or at least one downlink PSMP STA info filed and zero or at least one uplink PSMP STA info field.
  • the PSMP STA info field 370 includes a station information type (simply,
  • STAJNFO type subfield 510 subfield 510, a DTT start offset subfield 520, a DTT duration subfield 530, an STA ID subfield 540, a UTT start offset subfield 550, and a UTT duration subfield 560.
  • the STAJNFO type subfield indicates whether a PSMP STA info field is an individually addressed case or a group addressed case. If it is the individually addressed case as in the example of FIG. 5, a value of the STAJNFO type subfield 510 may be set to 2.
  • the DTT start offset subfield 520 indicates a start of a PSMP-DTT relative to an end of a PSMP frame with respect to a destination identified by the PSMP STA info field.
  • the UTT start offset subfield 550 indicates a start of a PSMPJJTT relative to an end of the PSMP frame with respect to the destination identified by the PSMP STA info field. This subfield indicates a start time of a first PPDU including downlink/uplink data with respect to the destination.
  • the DTT duration subfield 530 indicates a duration of the PSMP-DTT with respect to the destination identified by the PSMP STA info field.
  • the UTT duration subfield 560 indicates a duration of the PSMP-UTT with respect to the destination identified by the PSMP STA info field. This subfield indicates an end time of a last PPDU including downlink/uplink data with respect to the destination, and a value set in this subfield is relative to a value set in the PSMP-DTT/UTT start offset subfield.
  • the STA ID subfield includes an association identifier (AID) of an STA directed by the PSMP STA info field.
  • any DTT or UTT may be allocated to a plurality of STAs.
  • SDMA space- division multiple access
  • the AP allocates a maximum number of spatial streams usable by each STA to transmit uplink traffic, and then transmits spatial stream allocation information by containing the information in the PSMP frame.
  • the PSMP frame further including information indicating the number of spatial streams allocated to each STA in a DTT and a UTT according to the embodiment of the present invention is referred to as a space division PSMP frame.
  • the space division PSMP frame may report to each STA the number of spatial streams allocated to each STA by using a reserved bit in the PSMP frame of FIG. 5.
  • the AP may transmit spatial stream information indicating the number of spatial streams allocated to each STA by containing the information in the space division PSMP, or may transmit downlink spatial stream information indicating the number of spatial streams allocated to each STA in a DTT and uplink spatial stream information indicating the number of spatial streams allocated to each STA in a UTT by containing the information in the space division PSMP.
  • the spatial stream information indicating the number of spatial streams allocated to each STA may be set to a value indicating the total number of spatial streams allocated to each STA, or may be set to a value indicating the number of extension spatial streams additionally allocated in addition to one spatial stream allocated basically to each STA.
  • FIG. 6 shows an exemplary PSMP frame format for a space division PSMP according to an embodiment of the present invention.
  • a 'number of DTT spatial streams' field 610 indicates the number of spatial streams additionally allocated in a downlink transmission duration of an STA
  • a 'number of UTT spatial streams' field 620 indicates the number of spatial streams additionally allocated in an uplink transmission duration of the STA.
  • uplink transmission and downlink transmission can be performed simultaneously by several STAs in any time.
  • a downlink phase and an uplink phase cannot overlap with each other. That is, during a time in which a DTT is allocated to a specific STA, a UTT cannot be allowed to another STA.
  • FIG. 7 is a diagram showing an example of distributing a PHY interface.
  • an AP 700 has 8 available PHY interfaces, which is a case where a maximum number of allowable spatial streams is 8.
  • the same DTT and UTT are allocated to each of an STAl 710, an ST A2 720, and an STA3 730. That is, the STAl 710, the STA2 720, and the STA3 730 simultaneously receive downlink data from the AP and transmit uplink data to the AP.
  • three spatial streams, one spatial stream, and one spatial stream are additionally allocated respectively to the STAl 710, the STA2 720, and the STA3 730.
  • extension spatial streams 715 denote spatial streams additionally allocated to the STAl 701
  • an extension spatial stream 725 denotes a spatial stream additionally allocated to the STA2 720
  • an extension spatial stream 735 denotes a spatial stream additionally allocated to the STA3 730.
  • the STAl 710, the STA2 720, and the ST A3 730 respectively use four spatial streams, two spatial streams, and two spatial steams, i.e., eight spatial streams in total.
  • the total number of spatial streams does not exceed 8 which is the number of allowable spatial streams according to the number of available PHY interfaces of the AP 700.
  • the number of extension spatial streams that can be used by each STA according to such available PHY interface resource allocation may change by reallocation of the AP.
  • the number of spatial streams additionally allocated to one STA in a downlink transmission time and the number of spatial streams additionally allocated to each STA in an uplink transmission time may also change.
  • the AP can adaptively adjust the number of spatial streams allocated to each STA according to the number of STAs or an amount of data to be transmitted, priority, etc. Therefore, radio resource efficiency can be improved.
  • FIG. 8 is a block diagram showing a wireless apparatus for implementing an embodiment of the present invention.
  • a wireless apparatus 800 may be an AP or a non- AP STA.
  • the wireless apparatus 800 includes a processor 810, a memory 820, a transceiver
  • the transmitter 830 transmits/receives a radio signal, and implements an IEEE 802.11 physical layer.
  • the transmitter 830 supports directional transmission through the antenna 850.
  • the processor 810 is coupled to the transmitter 830, and implements an IEEE 802.11 MAC layer.
  • the wireless apparatus 800 is the AP.
  • the wireless apparatus 800 is the non-AP STA.
  • the processor 810 and/or the transmitter 830 may include an application-specific integrated circuit (ASIC), a separate chipset, a logic circuit, and/or a data processing unit.
  • ASIC application-specific integrated circuit
  • the memory 820 may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and/or other equivalent storage devices.
  • ROM read-only memory
  • RAM random access memory
  • flash memory a non-transitory computer-readable medium
  • the module may be stored in the memory 820 and may be performed by the processor 810.
  • the memory 820 may be located inside or outside the processor 810, and may be coupled to the processor 810 by using various well-known means.

Landscapes

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

Abstract

La présente invention concerne un procédé et un appareil de planification d'un accès à un support radio. Le procédé comprend l'émission, vers une première station, d'une première information sur l'heure d'émission en liaison descendante signalant une heure planifiée pour une première émission en liaison descendante visant à émettre une trame de données vers la première station, et l'émission d'une seconde information sur l'heure d'émission en liaison descendante signalant une heure planifiée pour la seconde émission en liaison descendante visant à émettre une trame de données vers une seconde station. La première information de flux spatial en liaison descendante, signalant le nombre de flux spatiaux alloués à la première émission en liaison descendante, est émise vers la première station, la seconde information de flux spatial en liaison descendante signalant le nombre de flux spatiaux alloués à la seconde émission en liaison descendante est émise vers la seconde station et l'heure planifiée pour la première émission en liaison descendante est égale à celle planifiée pour la seconde émission en liaison descendante.
PCT/KR2010/001859 2009-03-26 2010-03-26 Procédé et appareil de planification de ressources de support sans fil Ceased WO2010110619A2 (fr)

Applications Claiming Priority (2)

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US16345409P 2009-03-26 2009-03-26
US61/163,454 2009-03-26

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WO2010110619A2 true WO2010110619A2 (fr) 2010-09-30
WO2010110619A3 WO2010110619A3 (fr) 2010-12-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015196523A1 (fr) * 2014-06-27 2015-12-30 华为技术有限公司 Procédé et appareil de traitement d'indication de ressource, point d'accès, et site
CN115442854A (zh) * 2021-06-01 2022-12-06 华为技术有限公司 基于psmp的多链路数据传输方法、介质及设备
WO2023125166A1 (fr) * 2021-12-31 2023-07-06 联洲集团有限公司 Procédé et appareil de traitement de données, support de stockage lisible par ordinateur, et processeur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7366202B2 (en) * 2003-12-08 2008-04-29 Colubris Networks, Inc. System and method for interference mitigation for wireless communication
TWI472198B (zh) * 2006-01-31 2015-02-01 Interdigital Tech Corp 無線通信系統中提供及利用非競爭基礎頻道方法及裝置
US20080002733A1 (en) * 2006-06-30 2008-01-03 Ilan Sutskover Method and apparatus for scheduling transmissions in multiple access wireless networks

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015196523A1 (fr) * 2014-06-27 2015-12-30 华为技术有限公司 Procédé et appareil de traitement d'indication de ressource, point d'accès, et site
US10548156B2 (en) 2014-06-27 2020-01-28 Huawei Technologies Co., Ltd. Resource indication processing method and processing apparatus, access point, and station
CN115442854A (zh) * 2021-06-01 2022-12-06 华为技术有限公司 基于psmp的多链路数据传输方法、介质及设备
WO2023125166A1 (fr) * 2021-12-31 2023-07-06 联洲集团有限公司 Procédé et appareil de traitement de données, support de stockage lisible par ordinateur, et processeur
US12231369B2 (en) 2021-12-31 2025-02-18 Tp-Link Corporation Limited Method for processing data and wireless access point

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