WO2015112780A1 - Ajustement du niveau de puissance d'émission (tx) et de cca adaptatif pour deploiement dense de reseaux sans fil - Google Patents

Ajustement du niveau de puissance d'émission (tx) et de cca adaptatif pour deploiement dense de reseaux sans fil Download PDF

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WO2015112780A1
WO2015112780A1 PCT/US2015/012556 US2015012556W WO2015112780A1 WO 2015112780 A1 WO2015112780 A1 WO 2015112780A1 US 2015012556 W US2015012556 W US 2015012556W WO 2015112780 A1 WO2015112780 A1 WO 2015112780A1
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WIPO (PCT)
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spatial
level
power
stations
detected
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PCT/US2015/012556
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English (en)
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James June-Ming Wang
Jianhan Liu
Yung-Ping Hsu
Ching-Hwa Yu
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Mediatek Singapore Pte. Ltd.
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Publication of WO2015112780A1 publication Critical patent/WO2015112780A1/fr
Priority to US15/019,849 priority Critical patent/US9820162B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal

Definitions

  • TECHNICAL FIELD relate generally to wireless network communications, and, more particularly, to adaptive Clear Channel Assessment (CCA) and transmit (TX) power level adjustment for dense deployment in wireless communications systems.
  • CCA Clear Channel Assessment
  • TX transmit
  • IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specification for implementing wireless local area network (WLAN) communication, called WiFi, in the unlicensed (2.4, 3.6, 5, and 60 GHz) frequency bands.
  • the standards and amendments provide the basis for wireless network products using the WiFi frequency bands .
  • IEEE 802.11ac is a wireless networking standard in the 802.11 family providing high-throughput WLANs on the 5 GHz band. Significant wider channel bandwidths (20MHz, 40MHz, 80MHz, and 160MHz) were proposed in the IEEE 802.11ac standard.
  • the High Efficiency WLAN study group (HEW SG) is a study group within IEEE 802.11 working group that will consider the improvement of spectrum efficiency to enhance the system throughput in high-density scenarios of wireless devices. Because of HEW SG, TGax (an IEEE task group) was formed and tasked to work on IEEE 802.11ax standard that will become a successor to IEEE 802.11ac.
  • a transmitter of a BSS (basis service set) of certain bandwidth is allowed to transmit radio signals onto the shared wireless medium depending on clear channel assessment (CCA) sensing and a deferral or backoff procedure for channel access contention.
  • CCA clear channel assessment
  • a valid transmission sub-channel shall have bandwidth, allowable in the IEEE 802. llac , equal to or smaller than the full bandwidth of the BSS and contains the designated primary sub-channel of the BSS.
  • the transmitter is allowed to transmit in any of the valid transmission sub-channels as long as the CCA indicates the sub-channel (or full channel) is idle.
  • This dynamic transmission bandwidth scheme allows system bandwidth resource to be efficiently utilized.
  • An enhanced distributed channel access protocol is used in IEEE 802. llac as a channel contention procedure for wireless devices to gain access to the shared wireless medium, e.g., to obtain a transmitting opportunity (TXOP) for transmitting radio signals onto the shared wireless medium.
  • TXOP transmitting opportunity
  • the simple CSMA/CA with random back-off contention scheme and low cost ad hoc deployment in unlicensed spectrum have contributed rapid adoption of WiFi systems.
  • the EDCA TXOP is based solely on activity of the primary channel, while the transmit channel width determination is based on the secondary channel CCA during an interval (PIFS) immediately preceding the start of the TXOP .
  • PIFS interval
  • the basic assumption of EDCA is that a packet collision can occur if a device transmits signal under the channel busy condition when the received signal level is higher than CCA level.
  • CCA level -82dBm
  • the OBSS interference is substantially below the required noise level.
  • CCA level -82dBm
  • the operating SNR is still above the level required for max MCS.
  • the specific link throughput does not degrade, but CCA deferral is reduced (likelihood of channel access increased) leading to increased network throughput.
  • the network throughput increases until CCA level (OBSS interference) reaches the SNR for max MCS. Above that level, the individual link MCS degradation is to be balanced with increased likelihood of channel access (from increasing the CCA level) .
  • raising CCA level can introduce more collision in the networks. It also increases device power consumption due to retries and is unfair to legacy stations since they still use the baseline CCA level.
  • Similar network throughput increase can be achieved in some dense deployment scenario by lowering the transmit power of all stations (STAs) , which also reduces power consumption.
  • STAs stations
  • legacy and IEEE 802.11ax STAs co-exist in the same environment, only reducing the transmit power of the IEEE 802.11ax STAs can lead to their performance degradation. This is because legacy STAs transmission might not deter for reduced transmit power IEEE 802.11ax STAs (when the received signal falls below the CCA of legacy STAs) , but not vice versa.
  • IEEE 802.11ax STAs In order to entice IEEE 802.11ax STAs to perform TPC, it is necessary to also allow it to increase its CCA.
  • an IEEE 802.11ax STA increases its channel access (i.e., higher CCA) but also reduces its transmit power level (lower transmit power) such that it does not cause collision.
  • a method of spatial re-use with TPC and adaptive CCA is proposed.
  • a wireless station detects spatial re-use information associated with other inter-BSS stations having an ongoing frame exchange.
  • the spatial re-use information comprises a TX spectral density (power/Hz) and received signal or interference information of each inter-BSS station.
  • the wireless STA determines a TX spectral density based on the detected spatial re-use information.
  • the wireless STA then adapts it CCA level that allows it to contend the medium for spatial re-use transmission opportunity (TXOP) with other wireless station attempting spatial re-use.
  • TXOP spatial re-use transmission opportunity
  • the wireless STA starts a spatial re-use frame exchange with the intra-BSS peer station using the determined TX spectral density such that the spatial re-use frame exchange does not interfere with the ongoing frame exchange of the inter-BSS stations.
  • the wireless STA spatially reuse the medium without causing collision and interference to OBSS stations and thus increases network throughput .
  • the received signal or interference information comprises a received signal strength indicator (RSSI) , a received interference level, or the adjusted CCA level, optionally scaled by a signal bandwidth.
  • the spatial re-use information further comprises a BSS color of the inter-BSS stations (which identifies the station's BSS) , and a remaining TXOP of the ongoing frame exchange such that the spatial re-use TXOP is set to be less than or equal to the remaining TXOP of the ongoing frame exchange.
  • Figure 1 illustrates a wireless network having overlapping BSS (OBSS) with spatial re-use in accordance with one novel aspect .
  • OBSS overlapping BSS
  • Figure 2 is a simplified block diagram of as initiating device and a responding device in accordance with one novel aspect.
  • Figure 3 illustrates a method flow of a wireless device performing spatial re-use frame exchange in a wireless network .
  • Figure 4 illustrates a preferred embodiment of transmit power control and adaptive CCA level for spatial re-use with HEW stations.
  • Figure 5 illustrates another embodiment of transmit power control and adaptive CCA level based on RSSI for spatial re-use with legacy stations.
  • Figures 6 illustrates one embodiment of spatial re-use with excessive margin.
  • Figure 7 illustrates a processing flow of spatial re-use in accordance with one novel aspect.
  • Figure 8 illustrates spatial re-use and corresponding frame exchange with fair TXOP duration and EDCA rules.
  • Figure 9 illustrates an example of spatial re-use with uplink (UL) OFDMA.
  • Figure 10 illustrates an example of spatial re-use with beamformed transmission.
  • Figure 11 illustrates an example of spatial re-use with different channel width.
  • Figure 12 is a flow chart of a method of spatial re-use with TPC and adaptive CCA in accordance with one novel aspect.
  • FIG. 1 illustrates a wireless network 100 having overlapping basic service set (OBSS) with spatial re-use in accordance with one novel aspect.
  • Wireless network 100 comprises a plurality of wireless stations 111 (STA1) , 112 (STA2) , 113 (STA3) , and 114 (STA4) .
  • Each station can be an access point station (AP-STA) , or a non-AP-STA.
  • STA1 and STA2 belong to a first BSS1 having STA2 as an access point (AP)
  • STA3 and STA4 belong to a second BSS2 having STA4 as an access point (AP) .
  • BSS1 and BSS2 are overlapping BSS (OBSS) with overlapping coverages.
  • STA1 and STA2 have gained the access to the wireless medium and have ongoing frame exchange between them. Meanwhile, STA3 is trying to initiate a frame exchange with STA4.
  • an enhanced distributed channel access protocol is used as a channel contention procedure for wireless devices to gain access to the shared wireless medium, e.g., to obtain a transmitting opportunity (TXOP) for transmitting radio signals onto the shared wireless medium.
  • TXOP transmitting opportunity
  • the primary channel is BUSY of one of the predefined conditions is met based on Clear Channel Assessment (CCA) sensitivity levels .
  • CCA Clear Channel Assessment
  • the transmit channel width is selected based on the secondary channel CCA during an interval (PIFS) immediately preceding the start of TXOP.
  • the secondary channel is BUSY if one of the predefined conditions is met based on CCA levels .
  • IEEE 802.11ac is a wireless networking standard in the 802.11 family providing high-throughput WLANs on the 5 GHz band.
  • the High Efficiency WLAN study group (HEW SG) is a study group within IEEE 802.11 working group that will consider the improvement of spectrum efficiency to enhance the system throughput in high-density scenarios of wireless devices. Because of HEW SG, TGax (an IEEE task group) was formed and tasked to work on IEEE 802.11ax standard that will become a successor to IEEE 802.11ac.
  • a solution based on transmit power control (TPC) and adaptive CCA level is provided 1) to increase the spatial re-use without causing collision; 2) to maintain fairness between stations in different BSSs; 3) to maintain fairness between HEW stations and legacy stations; and 4) to maintain power efficiency .
  • TPC transmit power control
  • FIG. 1 if STA3 wants to establish a link with STA4 without interfering with STA1/STA2 with spatial re-use, it requires several
  • STA1/STA2 link is an inter-BSS link or an intra-BSS link; 2) STA3 should not cause interference to STA1 and STA2 , e.g., radio signal 121 does not interfere STA1 and radio signal 122 does not interfere STA2 ; and 3) STA4 should not cause interference to STA1 and STA2 , e.g., radio signal 123 does not interfere STA1 and radio signal 124 does not interfere STA4.
  • STA3 the initiating STA
  • STA4 the responding STA
  • the pre-condition 3 might not be satisfied .
  • STA4 transmission results in collision it is called the hidden node problem. Skipping the
  • pre-condition 3 results in simpler procedure at the expense of higher chance of collision. Additionally, pre-condition 2) might only be partially satisfied, i.e., STA3 might cause interference to one of STA1 or STA2.
  • TPC and adaptive CCA is applied by STA3 and/or STA4 to satisfy the preconditions for spatial re-use and thereby increasing network throughput.
  • Figure 2 is a simplified block diagram of an initiating device 201 and a responding device 211 in a wireless network
  • 201 comprises memory 202, a processor 203, a control and configuration module 204, a power controller 205, an EDCA module 206, a spatial re-use detection module 207, and a transceiver 208 coupled to antenna 209.
  • responding device 211 comprises memory 212, a processor 213, a control and configuration module 214, a power controller 215, an EDCA module 216, a spatial re-use detection module 217, and a transceiver 218 coupled to antenna 219.
  • the transceiver converts received baseband signals from the processor to RF signals and sends out to the antenna.
  • the processor processes the received baseband signals from the transceiver and invoke different functional modules to be configured to perform various features supported by the wireless devices.
  • the different modules are functional modules that can be implemented in software, firmware, hardware, or any combination thereof.
  • the function modules when executed by processors 203 and 213 (via program instructions 209 and 219 contained in memory 202 and 212) , interwork with each other to allow the wireless devices to perform channel access with spatial re-use.
  • the spatial re-use detection module observe the wireless medium to confirm that it is allowed to start a spatial re-use frame exchange 231, the EDCA module contends the wireless medium for spatial re-use with other STAs through a random backoff EDCA procedure, the control and configuration module performs various control and configuration functionalities, and the power control module determines and controls a transmit (TX) power level (or TX spectral power density) such that spatial re-use frame exchange 231 does not cause collision in the network.
  • TX transmit
  • FIG. 3 illustrates a method flow of a wireless device performing spatial re-use frame exchange in a wireless network.
  • the wireless network comprises a plurality of stations STA1 , STA2 , STA3 , and STA4.
  • step 311 STA1 and STA2 have gained a TXOP to access the wireless medium and have ongoing frame exchange between them.
  • STA3 is trying to initiate a frame exchange with STA4 by exploiting spatial re-use of the wireless medium.
  • step 331 STA3 performs spatial observation of the wireless medium and update its database for spatial re-use purpose. Note that spatial observation is an optional step and can occur during a long-term or a short-term moving observation window before the actual spatial re-use frame exchange.
  • step 332 STA3 performs spatial re-use detection and observes the on-going frame exchange in the wireless medium to confirm whether STA3 is allowed to start a spatial re-use frame exchange.
  • STA3 applies TPC with adaptive CCA level in determining its TX power level .
  • STA3 decides whether its TX power level is sufficient to close the link with STA4 based on its prior experience or observation. If there is not sufficient margin to close the link, STA3 abandons its attempt for spatial re-use based on current spatial detection. If STA3 has sufficient link margin, it then raises its CCA level based on the observed signal (power density) level from STA1 and STA2 such that it can perform EDCA backoff procedure.
  • STA3 performs an EDCA backoff procedure to contend the wireless medium with other spatial re-use STAs for spatial re-use frame exchange with STA4.
  • step 334 STA3 gains a spatial re-use TXOP and starts frame exchange with STA4.
  • STA4 is engaging in spatial observation when it receives a spatial re-use packet from STA3.
  • STA4 applies TPC in determining its TX power level when it transmits a response to STA3.
  • Figure 4 illustrates a preferred embodiment of transmit power control (TPC) and adaptive CCA level for spatial re-use with HEW stations .
  • TPC transmit power control
  • STAl and STA2 have ongoing frame exchange in BSS1
  • STA3 applies TPC to ensure that any spatial re-use frame exchange in BSS2 will not causing interference to STAl and to STA2.
  • STAl and STA2 signal their transmit power level (TX-PWR_STA1 and TX-PWR_STA2) and their received signal strength indicator (RSSI) from the peer.
  • TX-PWR allows a receiver (e.g., STA3) to determine the pathloss .
  • STA3 TX-PWR_STA1 - RSSI (by STA3 from STAl) .
  • the pathloss between STA2 and STA3 TX-PWR_STA2 - RSSI (by STA3 from STA2) .
  • TPC TX power level
  • Pathloss (STA2-3) TX-PWR_STA2 - RSSI (by STA3 from STA2) ;
  • TPC1 pathloss (STA1-3) ⁇ RSSI (by STAl from STA2) -
  • TPC2 pathloss (STA2-3) ⁇ RSSI (by STA2 from STAl) - Fixed Margin.
  • TPC1 or TPC2 only one of the two in-equality (TPC1 or TPC2) needs to be satisfied if the STA3 only observes transmission of one of STAl or STA2.
  • the fixed margin e.g., 20 dB, is required for signal to noise ratio (SNR) for operating certain MCS (Modulation and coding scheme) . If STA3 cannot close the link with STA4 , then STA3 should abandon its transmission. In some situations, STA3 does not receive either STA1 or STA2 signal. In this case, only one transmit power level (TPC1 or TPC2) obtained from the received signal is used.
  • TPC1 or TPC2 transmit power level
  • STA1 and STA2 might be operating at certain interference level from other links (which is above the noise level) .
  • a more precise estimation of the TX power level for STA3 can be obtained if STA1 and STA2 directly signal their received interference level , or their adjusted CCA level .
  • STA3 can then determine its TX power level based on the following equations for STA1 and STA2 respectively and select the lower TX power level between TPC1 and TPC2 such that STA3 would not cause interference to both STA1 and STA2.
  • TPC1 - Pathloss STA1 received interference level_STAl - error margin
  • TPC2 - Pathloss STA2 received interference level_STA2 - error margin
  • TPC1 - Pathloss STA1 adjusted CCA level_STAl error margin
  • TPC1 or TPC2 only one of the two in-equality (TPC1 or TPC2) needs to be satisfied if the STA3 only observes transmission of one of STA1 or STA2.
  • the error margin e.g. , 5 dB, is applied to accommodate error.
  • the adjusted CCA level of STA3 is equal to the received interference (+noise) level at STA3. If STA3 cannot close the link with STA4 , then STA3 should abandon its transmission. In some situations, the STA3 does not receive either STA1 or STA2 signal . In this case, only one transmit power level (TPC1 or TPC2) obtained from the received signal is used.
  • TPC1 or TPC2 transmit power level
  • STA3 In addition to transmit power level (TX-PWR) , RSSI from peer, received interference level, adjusted CCA level, additional information is required by STA3 from STA1 and STA2 for spatial re-use purpose.
  • STA3 needs to identify whether the STA1/STA2 link is an inter-BSS link or an intra-BSS link. In order to do that, STA1 and STA2 should signal their BSS color, or TX IDs and RX IDs.
  • a BSS color is a shortened indication (e.g., a 3-5 bits indication) of BSS ID, which is chosen by an AP based on its observation of BSS colors of overlapping neighbor BSSs.
  • STA3 needs to know the remaining TXOP duration of the ongoing STA1-STA2 frame exchange so that STA3 can gain a spatial re-use TXOP that is fair to other legacy STAs. Further details of the spatial re-use TXOP duration will be explained later with respect to Figure 8.
  • the spatial re-use STAs calculate space loss to STA1 and STA2 and adjust their transmit power to be below the received interference-margin of STA1 and STA2 to avoid collision.
  • TPC and adaptive CCA can avoid the collision during spatial re-use.
  • spatial re-use STAs do not have the information to adjust their transmit power level . This is because legacy STAs do not signal their transmit power and received interference , CCA, or RSSI from peer . Therefore, a different TPC should be used in a mixed environment with legacy STAs .
  • Figure 5 illustrates another embodiment of transmit power control and adaptive CCA level based on RSSI for spatial re-use with legacy stations.
  • legacy STA1 and STA2 have ongoing frame exchange, and HEW STA3 applies TPC to ensure that any spatial re-use frame exchange will not causing interference to STA1 and to STA2.
  • STA1 and STA2 in Figure 5 are legacy STAs, they do not signal their TX-PWR, another TPC is proposed for STA3 that is based on the RSSI and signal bandwidth from STA1 and STA2.
  • the basic assumptions here are 1) the received interference level is at the CCA of the legacy STA, and 2) the transmit power (i.e.
  • TX-PWR_Ref TX-PWR_Ref
  • CCI MAX (Received PWR_STA1, Received PWR_STA2) - CCA
  • TPC TX-PWR_Ref - CCI - margin
  • a reference transmit power level TX-PWR_Ref and the baseline CCA level at CCA_baseline are defined.
  • STA3 intending to access the medium, receives a signal from STA1 with a power level RX-PWR STA1 exceeding CCA and/or receives a signal from STA2 with a power level RX-PWR STA2 exceeding CCA.
  • Figures 6 illustrates one embodiment of spatial re-use with excessive margin in a wireless network 600.
  • STA1 and STA2 have ongoing frame exchange, and STA3 is trying to initiate spatial re-use frame exchange with other STAs.
  • STA1 has excess margin M_rx in the received link.
  • the excess margin is defined as the difference between the received SNR and the required SNR when highest MCS is being used.
  • STA1 can allow other OBSS spatial re-use STAs (e.g., STA3) more room for spatial re-use by: 1) signaling M_rx to other spatial re-use STAs, which allows OBSS STAs to have higher spatial re-use TPC; 2) lowering its own TPC to reduce interference to OBSS STAs, and 3) signaling an artificially raised received interference level or adjusted CCA to a higher level corresponding to M_rx, which allows OBSS STAs to have higher spatial re-use TPC.
  • STA3 OBSS spatial re-use STAs
  • the spatial re-use STA4 in response to STA3 signal should adjust its transmit power based on information received or received RSSI in the frame exchange signals of STA1 and STA2 immediately prior to STA3 ' s transmission of spatial re-use signal .
  • FIG. 7 illustrates a processing flow of spatial re-use in accordance with one novel aspect .
  • spatial re-use STA3 performs a four-step spatial re-use procedure to be able to have spatial re-use frame exchange while OBSS STA1 and STA2 have ongoing frame exchange.
  • the four steps are spatial observation, spatial re-use detection, spatial contention, and spatial re-use frame exchange .
  • STA3 observes the medium and constantly updates its database prior to frame exchange.
  • STA maintains a long-term moving window for a medium activity database.
  • STA3 monitors medium activity, e.g., frame exchange between STAl and STA2 and updates its database.
  • the database information obtained from information signaled by STAs, observed RSSIs , BSS color, etc.
  • the spatial observation allows STA3 to form a decision of what transmit power level to use during spatial re-use, and to determine whether the recipient STA is nearby or not when a nearby STA sends a frame. Note the TPC based on the long-term spatial observation is overly conservative since most of neighbor STAs observed might not be active during the spatial re-use frame exchange.
  • STA3 wants to initiate a frame exchange and therefore detects ongoing frame exchange in the medium to confirm that it is allowed to start a spatial re-use frame exchange . Since a pair of STAs (STAl and STA2) are doing frame exchange, both STAl and STA2 need to be taken into considerations during the spatial re-use detection. In order for STA3 not to interfere with both STAl and STA2 , STA3 observes the medium and performs spatial re-use detection. Spatial re-use detection mandates STA3 to observe the medium for a duration (e.g., T2) during which both STAl and STA2 transmit PPDU.
  • a duration e.g., T2
  • STA3 determines a first transmit power that would not cause interference to STAl, a second transmit power that would not cause interference to STA2 , and then selects the lower transmit power so that the spatial re-use frame exchange would not interfere both STAl and STA2.
  • STA3 might only receive signal from one of STAl or STA2 during spatial detection.
  • STA3 should also collects spatial re-use information such as BSS color, received interference level or received RSSI or adjusted CCA, remaining TXOP duration from STA1 and STA2.
  • a spatial re-use STA4 should also observes the medium and the spatial re-use information collected immediately prior to receiving a signal from STA3 is used to determine its transmit power level .
  • STA3 contends the medium for spatial re-use with other STAs .
  • STA3 decides whether to initiate a spatial re-use frame exchange based on if it can close the link .
  • STA3 shall perform a backoff procedure (e.g., EDCA procedure) during time T3 to prevent collision with other spatial re-use stations.
  • STA3 spatial re-use backoff procedure should be independent from non- spatial -reuse backoff procedures that are not invoked by the adaptive CCA. This is to ensure fairness to legacy STAs, because legacy STAs do not participate in the spatial re-use EDCA.
  • the spatial re-use EDCA cannot be used to change the back off counter of the EDCA that employs fixed legacy CCA levels. It is important that all spatial re-use STA use the same procedure to determine when to start spatial re-use backoff procedure to ensure all spatial re-use STAs compete equally and avoids collision among the spatial re-use STAs.
  • STA3 starts a spatial re-use frame exchange by transmitting a frame to its intended recipient station (e.g., STA4) .
  • STA3 gains spatial re-use TXOP and starts frame exchange with its peer station (e.g., STA4) during time T4.
  • STA4 is a legacy STA
  • STA3 shall start with a request to send (RTS) transmission to avoid STA4 interfering with STA1/STA2 or any other OBSS STAs in proximity to STA4.
  • Legacy STA will not respond with clear to send (CTS) if its NAV is not zero.
  • CTS clear to send
  • Spatial re-use STA4 adopts the CCA and TX power level adjustment rules for spatial re-use when it responds to STA3. STA4 should determine whether it could respond and adjust its TX power level based on the spatial re-use information it receives during spatial observation of ongoing medium activities prior to STA3 ' s transmission, the prior or observed link margin with STA3. STA4 determines its TX power level the same way as STA3 based on its received or observed spatial re-use information.
  • Figure 8 illustrates spatial re-use and corresponding frame exchange with a fair TXOP duration and EDCA rules in a mixed wireless network with both legacy stations and spatial re-use stations.
  • API STA1 and STA2 belong to a first BSS1
  • spatial re-use STA3 belongs to a second BSS2.
  • STA1 and API engages in an ongoing frame exchange.
  • Spatial re-use STA3 initiates a spatial re-use frame exchange with other stations in BSS2 (e.g. , another STA, STA4 , not shown) .
  • BSS2 e.g. , another STA, STA4 , not shown
  • STA2 is a legacy station, and its NAV setting is non-zero from time tO to tl due to the ongoing frame exchange between STA1 and API.
  • the spatial re-use frame exchange duration (TXOP) should be limited to the original NAV setting between STA1 and API .
  • the spatial re-use transmission shall end before time tl so that it will not cause STA2 NAV to be extended to time t2.
  • STA2 can resume medium contention from time tl .
  • STA1 and API can signal the remaining TXOP duration. For example, they signal the remaining duration from a reference time epoch in the packet such as at the end of the preamble or end of the packet transmission.
  • the OBSS non-AP spatial re-use STA or OBSS spatial re-use AP may initiate a spatial re-use exchange after a spatial re-use Backoff.
  • the spatial re-use Backoff is initialized with pre-defined EDCA parameters or from the most recently received spatial re-use EDCA parameter set element sent by the AP with which the STA is associated.
  • the spatial re-use Backoff is initialized with the spatial re-use EDCA parameters
  • the spatial re-use Backoff function begins or resumes when the spatial detection is performed.
  • the spatial re-use Backoff function is independent of all other legacy backoff functions but follows the similar EDCAF backoff procedure.
  • An OBSS non-AP spatial re-use STA or OBSS spatial re-use AP that invokes or resumes a spatial re-use Backoff at the confirmation of a spatial re-use condition shall set a spatial re-use timer to NAV or based on spatial re-use information such as received remaining TXOP duration and reset its NAV and suspend EDCAF backoff procedures.
  • An OBSS non-AP spatial re-use STA or OBSS spatial re-use AP that initiates a new spatially re-use frame exchange after a spatial re-use Backoff procedure shall start the exchange with RTS/CTS when transmitting to a legacy STA or start with regular frame when transmitting to another spatial re-use STA and shall limit the duration of the exchange such that it ends before the expiry of the spatial re-use timer.
  • the STA shall obey the TXOP limit of the AC of the frames transmitted within the spatial re-use frame exchange or the remaining TXOP duration received during spatial detection.
  • An STA that transmits a spatial re-use frame exchange may transmit additional spatial re-use frame exchanges by continuing to use the spatial re-use Backoff function until the expiry of the spatial re-use timer. If the ongoing frame exchange transmission is between a pair of STAs within its BSS (with matching BSS color) , the STA does not reset its NAV even though the Spatially Re-use conditions are met.
  • FIG. 9 illustrates an example of OFDMA operation.
  • One mode of Uplink (UL) OFDMA operation starts with API transmitting a trigger frame and multiple STAs (STA1-STA3) transmit UL OFDMA signals which occupy a fraction of the channel bandwidth.
  • STAs in response to AP signal, might not perform CCA before their uplink transmission and STAs have high transmit power density (narrow band signal) , it is expected that STAs' signals may propagate farther than APs signal . Additionally, STAs' transmission duration can be shorter than TXOP. Therefore, it is more difficult to perform spatial observation or spatial re-use detection for UL OFDMA.
  • an OBSS spatial re-use STA can use the aggregate received power and aggregate received interference from these OFDMA STAs to adapt its CCA level and determine its transmit power adjustment. In another embodiment, an OBSS spatial re-use STA can use the
  • max-received power from all the OFDMA STAs to adapt its CCA and adjust its TX power to be below minimum received interference of all OFDMA STAs .
  • no spatial re-use is applied if UL OFDMA is used.
  • AP-to-AP coordination is required for UL OFDMA to mitigate OBSS interference based on some pre-determined procedure.
  • Figure 10 illustrates an example of spatial re-use with beamformed transmission.
  • STA with spatial reciprocity it can employ beamforming during spatial re-use detection.
  • Spatial reciprocity is a device capability of transmitting and receiving with the same antenna pattern that could be synthesized with multiple antennas.
  • STA1 and STA2 engages in an ongoing frame exchange in BSS1.
  • Spatial re-use STA3 can perform spatial detection under beamformed condition.
  • proper beamforming antenna setting 1013 can be used to suppress the received power fromSTAl and/orSTA2 or to enhance link margin with STA4 during spatial detection and spatial re-use frame exchange.
  • spatial re-use STA3 initiates a spatial re-use frame exchange with STA4 in BSS2.
  • STA3 performs a spatial detection with radio signals 1011 and 1012 from STA1 and STA2 via spatially reciprocal beamforming. If STA3 cannot hear from STA1 and STA2 using a beamformed antenna pattern 1013 for receiving, then the radio signals transmitted from the spatially reciprocal device STA3 do not interfere STA1 and STA2 if STA3 applies with the same beamformed antenna pattern 1013.
  • the same adaptive CCA and transmit power adjustment procedure can be applied to the spatially reciprocal beamforming STAs for spatial re-use.
  • Proper beamforming in conjunction with the proposed TPC and adaptive CCA can enhance the spatial re-use by suppressing STA1 and/or STA2 signal level and/or enhancing link robustness and quality between STA3 and STA4.
  • Figure 11 illustrates an example of spatial re-use with different channel widths.
  • the signal propagation range is determined by the spectral density (power/Hz) instead of the signal power level.
  • the baseline (primary channel) CCA levels are based on equal spectral density for all RX channel widths.
  • the CCA level/channel width (in unit of 20MHz) is equal to -82dBm, -79 dBm, -76 dBm, -73 dBm for any 20MHz, 40MHz, 80MHz, and 160MHz RX channels, respectively.
  • the TX spectral density is not the same for all TX channel widths.
  • the TX spectral density of a narrower TX channel is typically higher than the TX spectral density of a wider TX channel, e.g., TX_PWR/20M > TX_PWR/40M > TX_PWR/80M > TX_PWR/160M.
  • TX_PWR/20M > TX_PWR/40M > TX_PWR/80M > TX_PWR/160M e.g., TX_PWR/20M > TX_PWR/40M > TX_PWR/80M > TX_PWR/160M.
  • TX-PWR should be scaled to provide equal TX spectral density.
  • These transmit power level is determined based on the received power density level (received RSSI scaled by signal bandwidth from legacy STAs) or the received interference power density level or adjusted CCA level scaled by the signal bandwidth received from spatial re-use STA.
  • the signaled TX power level should be adjusted by bandwidth. This resolves the issue of narrower width transmission interfering or deferring a wider width transmission. The likelihood of the wider channel
  • an STA follow the following modified EDCA channel access: a) Transmit a 160MHz or 80+80MHZ mask PPDU at the power level P if the secondary channel, the secondary 40MHz channel and the secondary 80MHz channel were idle during an interval of PIFS immediately preceding the start of the TXOP; b) Transmit an 80MHz mask PPDU at the power level P-3dB on the primary 80MHz channel if the secondary channel and the secondary 40MHz channel were idle during an interval of PIFS immediately preceding the start of the TXOP; c) Transmit a 40MHz mask PPDU at a power level P-6dB on the primary 40MHz channel if the secondary channel was idle during an interval of PIFS immediately preceding the start of the TXOP; d) Transmit a 20MHz mask PPDU at a power level P-9dB on the primary 20MHz channel; and e) Restart the channel
  • FIG 12 is a flow chart of a method of spatial re-use with TPC and adaptive CCA in accordance with one novel aspect .
  • a spatial re-use station detects spatial re-use information associated with other peer stations belong to an inter-BSS or overlapping BSS .
  • the inter-BSS peer stations engage an ongoing frame exchange.
  • the spatial re-use information comprises a TX spectral density (power/Hz) and received signal or interference information of each inter-BSS peer station.
  • the spatial re-use STA determines a TX spectral density based on the detected spatial re-use information.
  • the spatial re-use STA contends the medium for spatial re-use transmission opportunity (TXOP) with an intra-BSS peer station.
  • the spatial re-use STA starts a spatial re-use frame exchange with the intra-BSS peer station using the determined TX spectral density such that the spatial re-use frame exchange does not interfere with the ongoing frame exchange.
  • TX spectral density By adjusting the TX spectral density, the spatial re-use STA adapts its CCA level to spatially reuse the medium without causing collision and interference to OBSS stations and thus increases network throughput .

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Abstract

La présente invention concerne un procédé de réutilisation spatiale avec régulation de puissance d'émission (TPC) et test CCA (Clear Channel Assessment) adaptatif. Une station de réutilisation spatiale détecte des informations de réutilisation spatiale associée à d'autres stations OBSS homologues. Les informations de réutilisation spatiale comprennent une densité spectrale d'émission (puissance/Hz) et des informations d'interférence ou de signal reçu(e) de chaque station inter-systèmes de stations de base homologues (inter-BSS). La station de ré-utilisation spatiale (STA) détermine une densité spectrale d'émission (TX) sur la base des informations de réutilisation spatiale détectées. Ensuite, la station de ré-utilisation spatiale (STA) entre en conflit concernant le support pour la possibilité de réutilisation spatiale de transmission (TXOP) avec une station intra-BSS homologue. Enfin, la station de ré-utilisation spatiale (STA) démarre un échange de trames de réutilisation spatiale avec la station intra-BSS homologue au moyen de la densité spectrale d'émission déterminée. Grâce à l'ajustement de la densité spectrale d'émission, la station de ré-utilisation spatiale (STA) adapte son niveau de CCA à la réutilisation spatiale du support sans provoquer de collision et d'interférence pour des stations OBSS permettant ainsi d'augmenter la capacité du réseau.
PCT/US2015/012556 2014-01-24 2015-01-23 Ajustement du niveau de puissance d'émission (tx) et de cca adaptatif pour deploiement dense de reseaux sans fil WO2015112780A1 (fr)

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