Wireless communication method for indicating status of non-primary channel access operation mode and related wireless communication device
The method and device facilitate dynamic NPCA operation adjustments by transmitting frames with updated status and parameters, enhancing WLAN device efficiency in adapting to environmental changes.
Patent Information
- Application Number
- PCT/CN2025/103318
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-06-28
- Filing Date
- 2025-06-25
- Publication Date
- 2026-01-02
AI Technical Summary
WLAN devices may struggle to support non-primary channel access (NPCA) due to environmental constraints or design limitations, necessitating dynamic updates in NPCA parameters when environmental conditions change.
A wireless communication method and device that generate and transmit frames carrying the status and parameters of NPCA operation mode, allowing devices to dynamically suspend, deactivate, disable, resume, activate, or enable NPCA based on updated conditions.
Enables WLAN devices to adapt NPCA operations dynamically, improving medium utilization and channel access efficiency by aligning with changing environmental conditions.
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Figure CN2025103318_02012026_PF_FP_ABST
Abstract
Description
WIRELESS COMMUNICATION METHOD FOR INDICATING STATUS OF NON-PRIMARY CHANNEL ACCESS OPERATION MODE AND RELATED WIRELESS COMMUNICATION DEVICEBACKGROUND OF THE INVENTION
[0001] 1. FIELD OF THE INVENTION
[0002] The present invention relates to wireless communications, and more particularly, to a wireless communication method for indicating a status of a non-primary channel access operation mode and a related wireless communication device.
[0003] 2. DESCRIPTION OF THE PRIOR ART
[0004] A continuous technical goal of development and evolution of a wireless local area network (WLAN) is to continuously improve the throughput. The WLAN is a network that uses wireless communication technology (e.g., Wi-Fi technology) to transmit / receive data within a limited range. Non-primary channel access (NPCA) is a feature to improve medium utilization. When a non-access-point (non-AP) station (STA) listens on a primary channel and the primary channel is occupied by an overlapping basic service set (OBSS) with a network allocation vector (NAV) counter or a transmitted OBSS physical layer protocol data unit (PPDU) , the non-AP STA that supports NPCA may switch to a secondary channel. After channel switching, a backoff procedure is conducted to sense and access the secondary channel. Hence, the non-AP STA may use the secondary channel to perform frame exchange. After expiration of the OBSS NAV counter or the end of OBSS PPDU transmission, the non-AP STA switches back to the primary channel. NPCA needs an access point (AP) and a non-AP STA both are capable of switching to a secondary channel during a specific period. However, a WLAN device (e.g., Wi-Fi device (AP or non-AP STA) ) may be unable to support NPCA in an environment due to the environment being too busy or the WLAN device’s own constraints. In addition, NPCA may work under certain constraints defined by design parameters, and these parameters may need to be updated when the environment changes.SUMMARY OF THE INVENTION
[0005] One of the objectives of the claimed invention is to provide a wireless communication method for indicating a status of a non-primary channel access operation mode and a related wireless communication device.
[0006] According to a first aspect of the present invention, an exemplary wireless communication method is disclosed. The exemplary wireless communication method includes: generating a first frame that carries a status of an NPCA operation (OP) mode; and transmitting the first frame to at least one WLAN device.
[0007] According to a second aspect of the present invention, an exemplary wireless communication device is disclosed. The exemplary wireless communication device includes a network interface circuit and a control circuit. The control circuit is arranged to generate a frame that carries a status of an NPCA operation (OP) mode, and instruct the network interface circuit to transmit the frame to at least one WLAN device.
[0008] These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is a diagram illustrating a wireless communication system that supports the proposed NPCA suspension / deactivation / disablement and resumption / activation / enablement scheme according to an embodiment of the present invention.
[0010] FIG. 2 is a diagram illustrating that applied timing of the status of the NPCA OP mode is controlled by an NPCA OP associated counter value according to an embodiment of the present invention.
[0011] FIG. 3 is a diagram illustrating that applied timing of the status of the NPCA OP mode on one link is controlled by an NPCA OP associated counter value on another link according to an embodiment of the present invention.
[0012] FIG. 4 is a diagram illustrating a signaling design of the status of the NPCA OP mode and related NPCA parameters according to an embodiment of the present invention.DETAILED DESCRIPTION
[0013] Certain terms are used throughout the following description and claims, which refer to particular components. As one skilled in the art will appreciate, electronic equipment manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not in function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to ... " . Also, the term "couple" is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.
[0014] FIG. 1 is a diagram illustrating a wireless communication system that supports the proposed NPCA suspension / deactivation / disablement and resumption / activation / enablement scheme according to an embodiment of the present invention. The wireless communication system 100 includes a plurality of wireless communication devices 102 and 104. For example, the wireless communication system 100 is a WLAN system such as a Wi-Fi system, including an AP and a non-AP STA. In one embodiment of the present invention, the wireless communication device 102 may be a WLAN device such as a Wi-Fi device acting as an AP, and the wireless communication device 104 may be another WLAN device such as a Wi-Fi device acting as a non-AP STA. In another embodiment of the present invention, the wireless communication device 102 may be WLAN device such as a Wi-Fi device acting as a non-AP STA, and the wireless communication device 104 may be another WLAN device such as a Wi-Fi device acting as an AP.
[0015] In some embodiments of the present invention, the wireless communication device (WLAN device or Wi-Fi device) 102 / 104 may be a multi-link device (MLD) that supports a multi-link operation (MLO) specified in WLAN standards. Hence, the wireless communication devices 102 and 104 may include an AP MLD (which owns multiple links working on different bands and capable of operating at the same time) and a non-AP MLD (which owns multiple links working on different bands and capable of operating at the same time) . In one embodiment of the present invention, the wireless communication device 102 may be a WLAN device such as a Wi-Fi device acting as an AP MLD with multiple affiliated APs, and the wireless communication device 104 may be a WLAN device such as a Wi-Fi device acting as a non-AP MLD with multiple affiliated non-AP STAs. The wireless communication device (e.g., non-AP MLD) 104 is associated to the wireless communication device (e.g., AP MLD) 102. In addition, there are multiple links L1-LN (N≥2) enabled between the wireless communication devices 102 and 104. However, this is for illustrative purposes only, and is not meant to be a limitation of the present invention. The proposed NPCA suspension / deactivation / disablement and resumption / activation / enablement scheme can work under a condition that one of the wireless communication devices 102 and 104 may be an AP MLD or a non-MLD AP, and the other of the wireless communication devices 102 and 104 may be a non-AP MLD or a non-MLD STA. Hence, when the wireless communication devices 102 and 104 include a non-MLD AP and a non-MLD STA, there is a single link L1 (N=1) enabled between the wireless communication devices 102 and 104.
[0016] For brevity and simplicity, only two wireless communication devices 102 and 104 are shown in FIG. 1. In practice, the wireless communication system 100 is allowed to have more than two wireless communication devices, including an AP (e.g., AP MLD or non-AP MLD) and more than one non-AP STAs (e.g., non-AP MLDs or non-MLD STAs) in the same BSS.
[0017] The wireless communication devices 102 and 104 may have the same or similar circuit structure. As shown in FIG. 1, the wireless communication device 102 includes a processor 112, a memory 114, a control circuit 116, and a network interface circuit 117, where the network interface circuit 117 includes a transmitter (TX) circuit 118 and a receiver (RX) circuit 120. The memory 114 is arranged to store a program code. The processor 112 is arranged to load and execute the program code to manage the wireless communication device 102. The control circuit 116 is arranged to control wireless communications with the wireless communication device 104. In a case where the wireless communication device 102 is an AP (e.g., AP MLD or non-MLD AP) and the wireless communication device 104 is a non-AP STA (e.g., non-AP MLD or non-MLD STA) , the control circuit 116 controls the TX circuit 118 of the network interface circuit 117 to deal with downlink (DL) traffic between AP and non-AP STA, and controls the RX circuit 120 of the network interface circuit 117 to deal with uplink (UL) traffic between AP and non-AP STA. In another case where the wireless communication device 102 is a non-AP STA (e.g., non-AP MLD or non-MLD STA) and the wireless communication device 104 is an AP (e.g., AP MLD or non-MLD AP) , the control circuit 116 controls the TX circuit 118 of the network interface circuit 117 to deal with UL traffic between AP and non-AP STA, and controls the RX circuit 120 of the network interface circuit 117 to deal with DL traffic between AP and non-AP STA.
[0018] The wireless communication device 104 includes a processor 122, a memory 124, a control circuit 126, and a network interface circuit 127, where the network interface circuit 127 includes a TX circuit 128 and an RX circuit 130. The memory 124 is arranged to store a program code. The processor 122 is arranged to load and execute the program code to manage the wireless communication device 104. The control circuit 126 is arranged to control wireless communications with the wireless communication device 102. In a case where the wireless communication device 102 is an AP (e.g., AP MLD or non-MLD AP) and the wireless communication device 104 is a non-AP STA (e.g., non-AP MLD or non-MLD STA) , the control circuit 116 controls the TX circuit 118 of the network interface circuit 117 to deal with UL traffic between AP and non-AP STA, and controls the RX circuit 120 of the network interface circuit 117 to deal with DL traffic between AP and non-AP STA. In another case where the wireless communication device 102 is a non-AP STA (e.g., non-AP MLD or non-MLD STA) and the wireless communication device 104 is an AP (e.g., AP MLD or non-MLD AP) , the control circuit 116 controls the TX circuit 118 of the network interface circuit 117 to deal with DL traffic between AP and non-AP STA, and controls the RX circuit 120 of the network interface circuit 117 to deal with UL traffic between AP and non-AP STA.
[0019] It should be noted that only the components pertinent to the present invention are illustrated in FIG. 1. In practice, the wireless communication device 102 may include additional components to achieve designated functions, and / or the wireless communication device 104 may include additional components to achieve designated functions.
[0020] The wireless communication devices 102 and 104 support the proposed NPCA suspension / deactivation / disablement and resumption / activation / enablement scheme. The control circuit 102 of the wireless communication device 102 is arranged to generate a frame 132 that carries a status INFOP of an NPCA operation (OP) mode, and instruct the network interface circuit 117 (particularly, TX circuit 118 of network interface circuit 117) to transmit the frame 102 to its associated wireless communication device 104. During the association (or reassociation) , each of the wireless communication devices 102 and 104 may announce its capability to support NPCA or not. Usually, the announced NPCA capability is unchanged after association / reassociation unless the wireless communication device 102 / 104 uses certain protocols to update the NPCA capability. The NPCA OP mode may be active by default immediately after the association / reassociation is completed. In accordance with the proposed NPCA suspension / deactivation / disablement and resumption / activation / enablement scheme, the wireless communication device 102 / 104 may update its OP mode of NPCA to a different state (e.g., suspension / deactivation / disablement of NPCA) after the association / reassociation. The status INFOP is set to announce the latest status of the NPCA OP mode at the wireless communication devices 102. For example, the status INFOP is set to indicate an updated status being suspension / deactivation / disablement of NPCA. For another example, the status INFOP is set to indicate an updated status being resumption / activation / enablement of NPCA. Hence, when the wireless communication device 102 intends to suspend / deactivate / disable NPCA for a suspension / deactivation / disablement period due to certain factors, it can generate and transmit one frame 132 that carries the status INFOP set to indicate suspension / deactivation / disablement of NPCA; and when the wireless communication device 102 intends to resume / activate / enable NPCA after the end of the suspension / deactivation / disablement period, it can generate and transmit another frame 132 that carries the status INFOP set to indicate resumption / activation / enablement of NPCA. To put it simply, when both of wireless communication devices 102 and 104 have capability to support NPCA, the proposed NPCA suspension / deactivation / disablement and resumption / activation / enablement scheme allows the wireless communication device (e.g., AP or non-AP STA) 102 to suspend / deactivate / disable NPCA and to resume / activate / enable NPCA dynamically.
[0021] In some embodiments of the present invention, the frame 132 may further carry updated NPCA parameters INFPAR. For example, the frame 132 may further carry NPCA parameters INFPAR when the carried status INFOP of the NPCA OP mode is set to indicate resumption / activation / enablement of NPCA. The wireless communication device 102 / 104 may announce its NPCA parameters that define the NPCA behavior. For an AP, the NPCA parameters may include parameters to trigger NPCA channel switching and parameters to control operations during NPCA. For example, the AP-announced NPCA parameters may include Clear Channel Assessment (CCA) power level, TXOP / OBSS PPDU minimum length, BSS color (BSSID) of OBSS, Enhanced Distributed Channel Access (EDCA) parameters when operating on the secondary channel, a target secondary channel and its bandwidth (BW) , AP’s NPCA channel transition delay, AP’s TX power and / or sensitivity on non-primary channel (NPC) , etc. For a non-AP STA, the STA-announced NPCA parameters may include non-AP STA’s NPCA channel transition delay, non-AP STA’s TX power and / or sensitivity on NPC, indication of requiring initial control frame / initial control response (ICF / ICR) on NPC, etc. When an environment changes, these NPCA parameters may need to be updated accordingly. Hence, in addition to the latest status INFOP of the NPCA OP mode, the frame 132 generated and transmitted by the wireless communication device (e.g., AP or non-AP STA) 102 may include the latest NPCA OP mode parameters INFPAR. It should be noted that using the frame 132 to additionally carry NPCA parameters INFPAR may be optional. In practice, any wireless communication device (WLAN device or Wi-Fi device) using the proposed NPCA suspension / deactivation / disablement and resumption / activation / enablement scheme to suspend / deactivate / disable NPCA and to resume / activate / enable NPCA dynamically falls within the scope of the present invention.
[0022] Consider a case where the wireless communication device 102 is an AP that is capable of supporting NPCA and the wireless communication device 104 is one of a plurality of non-AP STAs that are capable of supporting NPCA and are associated to the same wireless communication device 102. The frame 132 may be a multicast frame that is multicast to the plurality of non-AP STAs, including the wireless communication device 104. When any of the plurality of non-AP STAs receives the frame 132, it may adjust its NPCA function immediately according to the latest status INFOP of the NPCA OP mode that is announced by the AP through the frame 132. When the AP suspends / deactivates / disables NPCA, the non-AP STA does not switch to the secondary channel afterwards. When the AP resumes / activates / enables NPCA, the non-AP STA switches to the secondary channel when the conditions triggering NPCA match with the NPCA OP mode parameters.
[0023] Consider a case where the wireless communication device 102 is an AP that is capable of supporting NPCA and the wireless communication device 104 is a non-AP STA that is capable of supporting NPCA and is associated to the wireless communication device 102. The frame 132 may be a unicast frame that is unicast to the wireless communication device 104. When the non-AP STA (i.e., wireless communication device 104) receives the frame 132, it may adjust its NPCA function immediately according to the status INFOP of the NPCA OP mode that is announced by the AP (i.e., wireless communication device 102) through the frame 132. When the AP suspends / deactivates / disables NPCA, the non-AP STA does not switch to the secondary channel afterwards. When the AP resumes / activates / enables NPCA, the non-AP STA switches to the secondary channel when the conditions triggering NPCA match with the NPCA OP mode parameters.
[0024] Consider a case where the wireless communication device 102 is an AP that is capable of supporting NPCA and the wireless communication device 104 is one of a plurality of non-AP STAs that are capable of supporting NPCA and are associated to the same wireless communication device 102. The frame 132 may be a unicast frame that is unicast to the wireless communication device 104 to deactivate / activate NPCA for individual non-AP STA. When the non-AP STA (e.g., wireless communication device 104) receives the frame 132, it may adjust its NPCA function immediately according to the status INFOP of the NPCA OP mode that is announced by the AP (i.e., wireless communication device 102) through the frame 132. When the AP suspends / deactivates / disables NPCA, the non-AP STA does not switch to the secondary channel afterwards. When the AP resumes / activates / enables NPCA, the non-AP STA switches to the secondary channel when the conditions triggering NPCA match with the NPCA OP mode parameters.
[0025] When the frame 132 is a unicast frame or a multicast frame, a non-AP STA (e.g., wireless communication device 104) may generate an acknowledgement frame (labeled by “ACK” ) 134, and transmit the acknowledgement frame 134 to the AP (e.g., wireless communication device 102) , where the acknowledgement frame 134 is used to confirm the reception of the frame 132. Alternatively, the non-AP STA (e.g., wireless communication device 104) may generate a response frame (labeled by “RSP” ) 136, and transmit the response frame 136 to the AP (e.g., wireless communication device 102) , where the response frame 136 is used to confirm the reception of the frame 132, and is further used to accept or reject the status INFOP of the NPCA OP mode that is announced by the AP.
[0026] Consider a case where the wireless communication device 102 is an AP MLD that is capable of supporting NPCA and the wireless communication device 104 is a non-AP MLD that is capable of supporting NPCA per link and is associated to the wireless communication device 102. The frame 132 may carry a link identifier (ID) to update the NPCA status of another link (s) . For example, the frame 132 carries the status INFOP of the NPCA OP mode on one link (e.g., LN, where N≠1) , and the frame 132 is transmitted on a different link (e.g., L1) . In this way, cross-link NPCA status update can be achieved under an MLO scenario.
[0027] Consider a case where the wireless communication device 102 is an AP that is capable of supporting NPCA and the wireless communication device 104 is a non-AP STA that is capable of supporting NPCA and is associated to the wireless communication device 102. The frame 132 may be a beacon frame (or a broadcast frame) . In one embodiment of the present invention, when the non-AP STA receives the frame 132, it may adjust its NPCA function immediately according to the latest status INFOP of the NPCA OP mode that is announced by the AP through the beacon frame. In another embodiment, the status INFOP of the NPCA OP mode may be valid after an NPCA OP associated counter value CNTOP carried in one beacon frame reaches a predefined value (e.g., CNTOP = 0) . FIG. 2 is a diagram illustrating that applied timing of the status INFOP of the NPCA OP mode is controlled by an NPCA OP associated counter value CNTOP according to an embodiment of the present invention. The control circuit 102 of the wireless communication device 102 is arranged to generate consecutive beacon frames (labeled by “B” ) 132_N, 132_N_1, …, 132_1, 132_0 (N≥2) , and instruct the network interface circuit 117 (particularly, TX circuit 118 of network interface circuit 117) to transmit the consecutive beacon frames 132_N-132_0 according to a beacon interval defined by Target Beacon Transmission Time (TBTT) . Each of the consecutive beacon frames 132_N-132_0 carries an NPCA OP associated counter value CNTOP. For example, the beacon frame 132_N may be the frame 132 that carries the latest status INFOP of the NPCA OP mode, and the NPCA OP associated counter value CNTOP is initialized by a positive integer N. The NPCA OP associated counter values CNTOP carried by the consecutive beacon frames 132_N-132_0 change monotonically. For example, the NPCA OP associated counter value CNTOP is adjusted by a decrement value 1 (i.e., CNTOP = CNTOP-1) each time one beacon frame has been transmitted. The status INFOP of the NPCA OP mode carried by the frame 132 (e.g., beacon frame 132_N) is valid after the NPCA OP associated counter value CNTOP reaches a predefined value (e.g., CNTOP = 0) . With a proper setting of the predefined value, more time is allowed for the non-AP STA (e.g., wireless communication device 104) to respond the status INFOP of the NPCA OP mode carried by the frame 132 (e.g., beacon frame 132_N) generated from the AP (e.g., wireless communication device 102) . Specifically, the non-AP STA may miss one or more beacon frames from the AP, and may have more time to adjust its own settings to fit the NPCA OP mode change such as suspension / deactivation / disablement of NPCA or resumption / activation / enablement of NPCA as indicated by the status INFOP of the NPCA OP mode. It should be noted that corresponding NPCA OP mode parameters can also be updated as indicated by NPCA parameters INFPAR in the frame 132 (e.g., beacon frame 132_N) .
[0028] Consider a case where the wireless communication device 102 is an AP MLD that is capable of supporting NPCA, the wireless communication device 104 is a non-AP MLD that is capable of supporting NPCA per link and is associated to the wireless communication device 102, and applied timing of the status INFOP of the NPCA OP mode is controlled by an NPCA OP associated counter value CNTOP. The frame 132 may carry a link ID to update the NPCA status of another link (s) . For example, the frame 132 carries the status INFOP of the NPCA OP mode on one link (e.g., Link 1 = L1) , and the frame 132 is actually transmitted on a different link (e.g., Link 0 = LN, where LN≠L1) . In this way, cross-link NPCA status update can be achieved under an MLO scenario. FIG. 3 is a diagram illustrating that applied timing of the status INFOP of the NPCA OP mode on one link (e.g., Link 1 = L1) is controlled by an NPCA OP associated counter value CNTOP on another link (e.g., Link 0 = LN, where LN≠L1) according to an embodiment of the present invention. Two links’ beacon frames may not be synchronized. When the NPCA OP associated counter value CNTOP of link 0 (e.g., beacon transmission link LN) reaches a predefined value (e.g., CNTOP = 0) , the status INFOP of the NPCA OP mode has been applied after the previous beacon transmission of link 1 (e.g., indicated link L1) . There may be delay of knowing the applied timing of status INFOP of the NPCA OP mode if the non-AP STA (e.g., wireless communication device 104) does not listen to beacon frames on link 1 (e.g., indicated link L1) . To address this issue, the frame 132 may employ another indication option that is based on a timing synchronization function (TSF) , where the indication may be set based on either a complete TSF or a partial TSF. The partial TSF may be obtained from applying bit truncation to the complete TSF. For example, the partial TSF may represent only bits [15: 6] of the complete 64-bit TSF.
[0029] Consider a case where the wireless communication device 102 is an AP that is capable of supporting NPCA, the wireless communication device 104 is a non-AP STA that is capable of supporting NPCA and is associated to the wireless communication device 102, and the frame 132 may be a beacon frame (or a broadcast frame) . The applied timing of the latest status INFOP of the NPCA OP mode may be indicated by a TSF value TSFOP that is also carried by the frame 132. Regarding an MLO scenario, the frame 132 may carry a link ID to update the NPCA status of another link (s) . For example, the frame 132 carries the status INFOP of the NPCA OP mode on one link (e.g., LN, where N≠1) , and the frame 132 is transmitted on a different link (e.g., L1) . In this way, cross-link NPCA status update can be achieved under the MLO scenario. For example, the status INFOP of the NPCA OP mode on the indicated link (e.g., LN) is valid when a TSF value counted by a TSF timer of the indicated link (e.g., LN) reaches the TSF value TSFOP carried by the beacon frame. For another example, the status INFOP of the NPCA OP mode on the indicated link (e.g., LN) is valid when a TSF value counted by a TSF timer of the indicated link (e.g., LN) plus an additional TSF offset between the beacon transmission link and the indicated link is equal to the TSF value TSFOP carried by the beacon frame. However, these are for illustrative purposes only, and are not meant to be limitations of the present invention.
[0030] Consider a case where the wireless communication device 102 is a non-AP STA that is capable of supporting NPCA and is associated to the wireless communication device 102, and the wireless communication device 104 is an AP. The frame 132 generated and transmitted from the non-AP STA may be a notification frame with an optional TSF value, and may carry the status INFOP of the NPCA OP mode and / or related NPCA parameters INFPAR. For example, the frame 132 may further carry NPCA parameters INFPAR when the carried status INFOP of the NPCA OP mode is set to indicate resumption / activation / enablement of NPCA. The AP (i.e., wireless communication device 104) may generate an acknowledgement frame (labeled by “ACK” ) 134, and transmit the acknowledgement frame 134 to the non-AP STA (i.e., wireless communication device 104) , where the acknowledgement frame 134 is used to confirm the reception of the frame 132. Alternatively, the frame 132 generated and transmitted from the non-AP STA may be a request frame with an optional TSF value, and may carry the status INFOP of the NPCA OP mode and / or related NPCA parameters INFPAR. The AP (i.e., wireless communication device 104) may generate a response frame (labeled by “RSP” ) 136, and transmit the response frame 136 to the AP (i.e., wireless communication device 102) , where the response frame 136 is used to confirm the reception of the frame 132, and is further used to accept or reject the latest status INFOP of the NPCA OP mode that is requested by the non-AP STA. For example, the AP may reject the latest status INFOP of the NPCA OP mode (e.g., suspension / deactivation / disablement of NPCA) that is requested by the non-AP STA when there are urgent DL data to be transmitted to the non-AP STA, where NPCA may increase the chance to meet the delay bond of these DL data. The latest status INFOP of the NPCA OP mode may be valid when the acknowledgement / response frame with acceptance from the AP is received by the non-AP STA. Alternatively, the latest status INFOP of the NPCA OP mode may be valid when a TSF value counted by a TSF timer reaches the TSF value carried by the request / notification frame.
[0031] In some embodiments of the present invention, a wireless communication device may be able to request the NPCA parameters and / or NPCA OP mode status from its peer device by transmitting a request frame to its peer device. For example, when a wireless communication device (e.g., non-AP STA) wakes up after sleeping for a long time and wants to know its associated peer device’s NPCA parameters and / or NPCA OP mode status, the wireless communication device (e.g., non-AP STA) can transmit a request frame to its associated peer device for querying about the NPCA parameters and / or the NPCA OP mode status. Specifically, the wireless communication device (e.g., AP or non-AP STA) 102 may generate and transmit the frame 132 (which carries requested NPCA OP mode status and / or requested NPCA parameters) in response a request frame (labeled by “REQ” ) 138 generated and transmitted from the wireless communication device (e.g., non-AP STA or AP) 104.
[0032] As mentioned above, the frame 132 may carry the status INFOP of the NPCA OP mode (which may indicate suspension / deactivation / disablement of NPCA or resumption / activation / enablement of NPCA) and related NPCA parameters INFPAR (which may include parameters to trigger NPCA channel switching and parameters to control operations during NPCA) . FIG. 4 is a diagram illustrating a signaling design of the status INFOP of the NPCA OP mode and related NPCA parameters INFPAR according to an embodiment of the present invention. The frame 132 may include a plurality of subfields such as a 4-bit Link ID subfield 402, a 1-bit Suspension subfield 404, a 8-bit Target secondary channel subfield 406, a 4-bit Target secondary channel BW subfield 408, an 8-bit Transition delay subfield 410, an 8-bit Minimum TXOP length subfield 412, an 8-bit TX power in NPC subfield 414, a 6-bit BSS Color 0 subfield 416, and a 6-bit BSS Color 1 subfield 418. The status INFOP of the NPCA OP mode is indicated by the Suspension subfield 404. When the Suspension subfield 404 is set by a first bit value (e.g., 1) , it indicates that the status INFOP of the NPCA OP mode is suspension / deactivation / disablement of NPCA. When the Suspension subfield 404 is set by a second bit value (e.g., 0) , it indicates that the status INFOP of the NPCA OP mode is resumption / activation / enablement of NPCA. These subfields 402-418 may be carried in an information element (IE) or directly in a frame body.
[0033] Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims
1.A wireless communication method comprising:generating a first frame that carries a status of a non-primary channel access (NPCA) operation (OP) mode; andtransmitting the first frame to at least one wireless local area network (WLAN) device.2.The wireless communication method of claim 1, wherein the status of the NPCA OP mode is set to indicate disablement of NPCA.3.The wireless communication method of claim 1, wherein the status of the NPCA OP mode is set to indicate enablement of NPCA.4.The wireless communication method of claim 1, wherein the wireless communication method is employed by an access point (AP) .5.The wireless communication method of claim 4, wherein the frame is a unicast frame.6.The wireless communication method of claim 4, wherein the frame is a multicast frame.7.The wireless communication method of claim 4, wherein the frame is a beacon frame.8.The wireless communication method of claim 7, further comprising:transmitting consecutive beacon frames, wherein each of the consecutive beacon frames carries a counter value, counter values carried by the consecutive beacon frames change monotonically, and the status of the NPCA OP mode carried by the first frame is valid after one of the counter values reaches a predefined value.9.The wireless communication method of claim 8, wherein the AP is a multi-link device (MLD) , the first frame carries the status of the NPCA OP mode on a first link of the MLD, and the first frame is transmitted on a second link of the MLD.10.The wireless communication method of claim 7, wherein the first frame further carries timing synchronization function (TSF) based indication, and applied timing of the status of the NPCA OP mode depends on the TSF based indication.11.The wireless communication method of claim 10, wherein the AP is a multi-link device (MLD) , the first frame carries the status of the NPCA OP mode and the TSF based indication on a first link of the MLD, and the first frame is transmitted on a second link of the MLD.12.The wireless communication method of claim 4, wherein the AP is a multi-link device (MLD) , the first frame carries the status of the NPCA OP mode on a first link of the MLD, and the first frame is transmitted on a second link of the MLD.13.The wireless communication method of claim 3, wherein the first frame further carries NPCA parameters.14.The wireless communication method of claim 1, further comprising:receiving a second frame from the at least one WLAN device;wherein the second frame queries about the status of the NPCA OP mode, and the first frame is generated and transmitted in response to the second frame.15.The wireless communication method of claim 14, wherein the wireless communication method is employed by an access point (AP) .16.The wireless communication method of claim 14, wherein the wireless communication method is employed by a non-access-point (non-AP) station (STA) .17.The wireless communication method of claim 1, wherein the wireless communication method is employed by a non-access-point (non-AP) station (STA) .18.The wireless communication method of claim 17, wherein the first frame is a request frame.19.The wireless communication method of claim 18, further comprising:receiving a second frame from the at least one WLAN device;wherein the second frame is generated in response to the first frame, and the status of the NPCA OP mode is valid after receiving the second frame.20.The wireless communication method of claim 17, wherein the first frame further carries NPCA parameters of the non-AP STA, and the status of the NPCA OP mode is set to indicate enablement of NPCA.21.A wireless communication device comprising:a network interface circuit; anda control circuit, arranged to generate a first frame that carries a status of a non-primary channel access (NPCA) operation (OP) mode, and instruct the network interface circuit to transmit the first frame to at least one wireless local area network (WLAN) device.
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