Method and apparatus for dealing with dynamic bandwidth expansion signaling and management of bandwidth dependent operations
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-02-06
- Publication Date
- 2026-08-13
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Figure CN2026077483_13082026_PF_FP_ABST
Abstract
Description
METHOD AND APPARATUS FOR DEALING WITH DYNAMIC BANDWIDTH EXPANSION SIGNALING AND MANAGEMENT OF BANDWIDTH DEPENDENT OPERATIONSBACKGROUND OF THE INVENTION1.FIELD OF THE INVENTION
[0001] The present invention relates to wireless communications, and more particularly, to a method and apparatus for dealing with dynamic bandwidth expansion (DBE) signaling from an access point (AP) to at least one non-AP station (STA) and management of bandwidth (BW) dependent operations between the AP and the at least one non-AP STA.
[0002] 2. DESCRIPTION OF THE PRIOR ART
[0003] Currently, in a wireless local area network (WLAN) such as a Wi-Fi network, an AP may support a channel bandwidth (CBW) up to 320 MHz that is larger than a CBW (e.g., 20, 40, 80, or 160 MHz) of a non-AP STA with cost consideration. For a typical Wi-Fi network operation, all transmissions must include the primary 20MHz channel, regardless of the total bandwidth used. The absence of large bandwidth non-AP STAs could result in significant portions of AP’s bandwidth being underused, causing a decrease in spectral efficiency. To address this issue, a dynamic subband operation (DSO) mechanism is proposed for allowing an AP to trigger a non-AP STA to switch to a DSO subband by sending an initial control frame (ICF) to the non-AP STA. In response to the ICF, the non-AP STA will switch its operating frequency to a target subband within AP’s operating BW, and then send an initial control response (ICR) back to the AP. In response to the ICR, the AP starts a following data transmission sequence between the AP and the non-AP STA.
[0004] Non-primary channel access (NPCA) is another feature to improve medium utilization. When a non-AP 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 (also called NPCA primary 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.
[0005] With the development of the Wi-Fi technology, new features are introduced to improve stability and efficiency. For example, a dynamic bandwidth expansion (DBE) operation enables an AP to dynamically adjust its operating BW to increase BW utilization when the OBSS activities change. The DBE operation may enable the AP to use an expanded BW when the OBSS interference on the subband is low, and may enable the AP to use a shrunk BW when the OBSS interference on the subband is high. For example, the DBE operation may enable the AP to dynamically switch between BSS BW (i.e., an operating BW of the AP with the DBE mode disabled) and DBE BW (i.e., an operating BW of the AP with the DBE mode enabled) , where DBE BW is larger than BSS BW. For another example, the DBE operation may enable the AP to dynamically switch between DBE BW1 (i.e., one operating BW of the AP with the DBE mode enabled) and DBE BW2 (i.e., another operating BW of the AP with the DBE mode enabled) , where DBE BW2 is larger than DBE BW1, and both of DBE BW1 and DBE BW1 are larger than BSS BW.Regarding certain BW-dependent features (e.g., NPCA and DSO) requiring dynamic switching between a secondary band and a primary band, DBE may cause the target band change. Thus, there is a need for an innovative design for enablement / disablement signaling of the DBE feature and the BW-dependent feature.SUMMARY OF THE INVENTION
[0006] One of the objectives of the claimed invention is to provide a method and apparatus for dealing with dynamic bandwidth expansion (DBE) signaling from an access point (AP) to at least one non-AP station (STA) and management of bandwidth (BW) dependent operations between the AP and the at least one non-AP STA.
[0007] According to a first aspect of the present invention, an exemplary wireless communication method is disclosed. The exemplary wireless communication method includes: triggering a change of a dynamic bandwidth expansion (DBE) operation of an access point (AP) ; and after the change of the DBE operation of the AP is triggered, transmitting a first frame to at least one non-AP station (STA) , wherein the first frame carries information indicative of a change of a first bandwidth (BW) dependent operation at the AP.
[0008] According to a second aspect of the present invention, an exemplary wireless communication method is disclosed. The exemplary wireless communication method includes: triggering a change of a dynamic bandwidth expansion (DBE) operation of an access point (AP) ; and indicating a change of at least one bandwidth (BW) dependent operation at the AP; wherein triggering the change of the DBE operation of the AP and indicating the change of the at least one BW dependent operation at the AP are performed concurrently.
[0009] According to a third aspect of the present invention, an exemplary wireless communication method is disclosed. The exemplary wireless communication method includes: receiving a frame from a non-AP STA regardless of whether a change of a dynamic bandwidth expansion (DBE) operation of an access point (AP) is effective, wherein the frame carries information indicative of a request for a change of at least one bandwidth (BW) dependent operation, and the request for the change of the at least one BW dependent operation is effective after the change of the DBE operation is effective; and triggering the change of the DBE operation of the AP.
[0010] 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
[0011] FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention.
[0012] FIG. 2 is a diagram illustrating a first wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention.
[0013] FIG. 3 is a diagram illustrating a second wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention.
[0014] FIG. 4 is a diagram illustrating a third wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention.
[0015] FIG. 5 is a diagram illustrating a fourth wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention.
[0016] FIG. 6 is a diagram illustrating a first wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention.
[0017] FIG. 7 is a diagram illustrating a second wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention.
[0018] FIG. 8 is a diagram illustrating a third wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention.
[0019] FIG. 9 is a diagram illustrating a fourth wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention.
[0020] FIG. 10 is a diagram illustrating a first wireless communication scenario in which the proposed pre-signaling scheme is employed according to an embodiment of the present invention.
[0021] FIG. 11 is a diagram illustrating a second wireless communication scenario in which the proposed pre-signaling scheme is employed according to an embodiment of the present invention.DETAILED DESCRIPTION
[0022] 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.
[0023] FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. The wireless communication system 100 includes a plurality of wireless communication devices. For example, the wireless communication system 100 is a WLAN system such as a Wi-Fi system, including an AP and one or more non-AP STAs associated to the AP. In this embodiment, the wireless communication system 100 may include an AP 102 and multiple non-AP STAs 104, 106, where the non-AP STAs 104, 106 are associated to the same AP 102. The AP 102 may be an Ultra High Reliability (UHR) AP supporting the DBE operation. Each of the non-AP STAs 104, 106 may be a UHR non-AP STA that is aware of the DBE operation of the AP 102. In addition, each of the non-AP STAs 104, 106 may support BW-dependent features (e.g., NPCA and DSO) under a condition that the AP 102 operates in the DBE mode.
[0024] For brevity and simplicity, three wireless communication devices are shown in FIG. 1. In practice, the wireless communication system 100 is allowed to have more than three wireless communication devices, including one AP and more than two non-AP STAs in the same BSS. Alternatively, the wireless communication system 100 is also allowed to have only two wireless communication devices, including one AP and one non-AP STA.
[0025] The AP 102 and the non-AP STA 104 / 106 may have the same or similar circuit structure. As shown in FIG. 1, the AP 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 configured to store a program code. The processor 112 is configured to load and execute the program code to manage operations of the AP 102. The control circuit 116 is configured to control wireless communications with the non-AP STAs 104, 106. For example, 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. The processor 112 and the control circuit 116 may be implemented using individual circuits or may be integrated in a same circuit, depending upon actual design considerations.
[0026] The non-AP STAs 104 and 106 may have the same or similar circuit structure. For example, the non-AP STA 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 configured to store a program code. The processor 122 is configured to load and execute the program code to manage operations of the non-AP STA 104. The control circuit 126 is configured to control wireless communications with the AP 102. For example, 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. The processor 122 and the control circuit 126 may be implemented using individual circuits or may be integrated in a same circuit, depending upon actual design considerations.
[0027] It should be noted that only components pertinent to the present invention are illustrated in FIG. 1.In practice, the AP 102 may include additional components to achieve designated functions, and / or the non-AP STA 104 / 106 may include additional components to achieve designated functions.
[0028] The AP 102 and the non-AP STAs 104, 106 support the proposed procedures for DBE signaling and management of BW-dependent operations. For example, the BW-dependent operations may include an NPCA operation, a DSO operation, or a combination thereof.
[0029] The control circuit 116 of the AP 102 is configured to instruct the network interface circuit 117 (particularly, TX circuit 118 of network interface circuit 117) to transmit a frame carrying enablement / update / disablement announcement of the DBE operation of the AP 102. In some embodiments of the present invention, the enablement / update / disablement announcement may be executed during the DBE preparation. In some embodiments of the present invention, the enablement / update / disablement announcement may be carried in a beacon frame (labeled by “BCN” ) 142 broadcast from the AP 102. In some embodiments of the present invention, the control circuit 126 of the non-AP STA 104 is configured to instruct the network interface circuit 127 (particularly, TX circuit 128 of network interface circuit 127) to transmit a probe request frame (labeled by “REQPRB” ) 132, and the enablement / update / disablement announcement may be carried in a probe response frame (labeled by “RSPPRB” ) 144 that is generated by the control circuit 116 of the AP 102 in response to the probe request frame (labeled by “REQPRB” ) 132 received through the network interface circuit 117 (particularly, RX circuit 120 of network interface circuit 117) and then transmitted to the non-AP STA 104 through the network interface circuit 117 (particularly, TX circuit 118 of network interface circuit 117) .
[0030] The enablement / update / disablement announcement includes information indicative of a time instant (e.g., an upcoming target beacon transmission time (TTBT) ) when the AP 102 intends to carry out a change (e.g., enablement, update, or disablement) of the DBE operation to switch its operating BW from a current BW setting to a different BW setting. In a first case where the change of the DBE operation is an enablement of the DBE operation, the current BW setting is the BSS BW, and the next BW setting is the DBE BW larger than BSS BW. In a second case where the change of the DBE operation is an update of the DBE operation, the current BW setting is a first DBE BW (which is set by a previous DBE operation) , and the next BW setting is a second DBE BW (which is an updated DBE BW set by a current DBE operation) , where the second DBE BW is different from (i.e., larger than or smaller than) the first BSS BW, and both of the first DBE BW and the second DBE BW are larger than the BSS BW. In a third case where the change of the DBE operation is a disablement of the DBE operation, the current BW setting is DBE BW, and the next BW setting is BSS BW smaller than DBE BW.
[0031] In some embodiments of the present invention, the NPCA / DSO update is also announced by the AP 102, and takes effect at the same time instant when the change (e.g., enablement or update) of the DBE operation is effective. For example, the NPCA / DSO update may also be announced in the same frame (e.g., beacon frame 142 or probe response frame 144) carrying the enablement / update announcement of the DBE operation.
[0032] According to a serial signaling scheme proposed by the present invention, the control circuit 116 of the AP 102 is configured to trigger the change (e.g., enablement / update / disablement) of the DBE operation at the time instant (e.g., upcoming TTBT) indicated by the enablement / update / disablement announcement, and is further configured to transmit a frame (labeled by “INDDBE” ) 148 to the non-AP STA 104 / 106 after the change (e.g., enablement / update / disablement) of the DBE operation of the AP 102 is triggered, wherein the frame 148 carries information indicative of a change (e.g., enablement or disablement) of a BW-dependent operation (e.g., NPCA operation or DSO operation) at the AP 102. For example, the frame 148 may be a broadcast frame.
[0033] After the frame 148 is transmitted to the non-AP STA 104, the non-AP STA 104 is aware of enablement / update / disablement of the DBE operation at AP 102. Hence, the control circuit 126 of the non-AP STA 104 is configured to instruct the network interface circuit 127 (particularly, TX circuit 128 of network interface circuit 127) to transmit a frame (labeled by “REQDBE” ) 134 to the AP 102, and the control circuit 116 of the AP 102 is configured to receive the frame 134 through the network interface circuit 117 (particularly, RX circuit 120 of network interface circuit 117) , where the frame 134 carries information indicative of a request for a change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) . In other words, the non-AP STA 104 transmits the frame 134 for enabling / disabling the BW-dependent operation (e.g., NPCA operation or DSO operation) between the AP 102 and the non-AP STA 104.
[0034] In some embodiments of the present invention, the control circuit 116 of the AP 102 may be configured to instruct the network interface circuit 117 (particularly, TX circuit 118 of network interface circuit 117) to transmit a frame (labeled by “RSP” ) 146 to the non-AP STA 104, where the frame 146 carries information indicative of a response to the request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried in the frame 134. For example, the frame 146 may be an acknowledgement (ACK) frame confirming successful receipt of the frame 134.
[0035] In some embodiments of the present invention, NPCA / DSO enablement / disablement signaling for a case where the AP operates under the DBE BW (which is larger than the BSS BW) and NPCA / DSO enablement / disablement signaling for a case where the AP operates under the BSS BW may be separate.
[0036] For example, the control circuit 116 of the AP 102 is further configured to transmit a frame (labeled by “INDBSS” ) 150 to the non-AP STA 104 / 106 before the change of the DBE operation of the AP 102 is triggered, wherein the frame 150 carries information indicative of a change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) at the AP 102. The change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried by the frame 148 is valid only during a period in which the AP 102 operates in the DBE mode. On the contrary, the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried by the frame 150 is valid only during a period in which the AP 102 does not operate in the DBE mode.
[0037] For another example, the control circuit 126 of the non-AP STA 104 is further configured to instruct the network interface circuit 127 (particularly, TX circuit 128 of network interface circuit 127) to transmit a frame (labeled by “REQBSS” ) 136 to the AP 102, and the control circuit 116 of the AP 102 is further configured to receive the frame 136 through the network interface circuit 117 (particularly, RX circuit 120 of network interface circuit 117) , where the frame 136 carries information indicative of a request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) . The request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried by the frame 134 is valid only during a period in which the AP 102 operates in the DBE mode. On the contrary, the request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried by the frame 136 is valid only during a period in which the AP 102 does not operate in the DBE mode.
[0038] FIG. 2 is a diagram illustrating a first wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention. For example, the AP 102 may be represented by “AP” in FIG. 2, the non-AP STA 104 may be represented by “STA1” in FIG. 2, and the non-AP STA 106 may be represented by “STA2” in FIG. 2. Assume that the DSO subband or NPCA primary channel is to be updated and announced by the AP 102. The AP 102 broadcasts a beacon frame 142_1 carrying enablement / update announcement of a DBE operation as well as update announcement of the DSO subband / NPCA primary channel. In this embodiment, the enablement / update announcement indicates that the AP 102 intends to trigger a change (e.g., enablement or update) of the DBE operation at a time instant T1 (e.g., an upcoming TBTT at which a beacon frame 142_2 will be broadcast) for switching AP’s operating BW from BW1 to BW2 (BW2 > BW1) . In a case where the change of the DBE operation is an enablement of the DBE operation, BW1 may be BSS BW (e.g., BSS BW = 40 MHz (BW40) ) , and BW2 may be DBE BW (e.g., DBE BW = 160 MHz (BW160) > BSS BW) . In another case where the change of the DBE operation is an update of the DBE operation, BW1 may be DBE BW1 (e.g., DBE BW1 = 160 MHz (BW160) ) , and BW2 may be DBE BW2 (e.g., DBE BW2 = 320 MHz (BW320) ) . In addition, update of the DSO subband / NPCA primary channel becomes effective at the same time instant when the change of the DBE operation of the AP 102 is effective.
[0039] At the time instant T1, the AP 102 broadcasts the beacon frame 142_2. After transmission of the beacon frame 142_2 is completed, the AP 102 broadcasts a frame 148_1 to the non-AP STAs 104 and 106, where the frame 148_1 carries information indicative of an enablement of a first BW-dependent operation (e.g., DSO operation) at the AP 102. After informed of the enablement of the first BW-dependent operation (e.g., DSO operation) , the non-AP STA 104 transmits a frame 134_1 to the AP 102, where the frame 134_1 carries information indicative of a request for an enablement of the first BW-dependent operation (e.g., DSO operation) . After receiving the frame 134_1 from the non-AP STA 104, the AP 102 generates and transmits a frame 144_1 to the non-AP STA 104 as a response that acknowledges successful receipt of the frame 134_1.
[0040] After transmission of the frame 144_1 is completed, the AP 102 broadcasts another frame 148_2 to the non-AP STAs 104 and 106, where the frame 148_2 carries information indicative of an enablement of a second BW-dependent operation (e.g., NPCA operation) at the AP 102. After informed of the enablement of the second BW-dependent operation (e.g., NPCA operation) , the non-AP STA 106 transmits a frame 134_2 to the AP 102, where the frame 134_2 carries information indicative of a request for the enablement of the second BW-dependent operation (e.g., NPCA operation) . After receiving the frame 134_2 from the non-AP STA 106, the AP 102 generates and transmits a frame 144_2 to the non-AP STA 106 as a response that acknowledges successful receipt of the frame 134_2.
[0041] Regarding the embodiment shown in FIG. 2, the AP 102 transmits the frame 144_1 / 144_2 to acknowledge successful receipt of the frame 134_1 / 134_2 carrying information indicative of a request for an enablement of a BW-dependent operation (e.g., NPCA operation or DSO operation) . However, this is for illustrative purposes only, and is not meant to be a limitation of the present invention. In some embodiments of the present invention, transmission of the frame 144_1 / 144_2 may be omitted.
[0042] FIG. 3 is a diagram illustrating a second wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention. The main difference between the second wireless communication scenario shown in FIG. 3 and the first wireless communication scenario shown in FIG. 2 is that transmission of the frame 144_1 / 144_2 is absent in the second wireless communication scenario. Instead, the request for the enablement of the first BW-dependent operation (e.g., DSO operation) carried by the frame 134_1 is deemed accepted after a predetermined timeout period PTO, and the request for the enablement of the second BW-dependent operation (e.g., NPCA operation) carried by the frame 134_2 is deemed accepted after the predetermined timeout period PTO. A start time of the predetermined timeout period PTO may be aligned with a time instant that depends on transmission of the frame 134_1 / 134_2. Hence, a request for an enablement of a BW-dependent operation (e.g., DSO operation or NPCA operation) will be accepted automatically after the predetermined timeout period PTO is expired. For example, the predetermined timeout period PTO may be announced by the AP 102 in advance. For another example, the predetermined timeout period PTO may be negotiated during association between the AP 102 and the non-AP STA 104 / 106.
[0043] FIG. 4 is a diagram illustrating a third wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention. For example, the AP 102 may be represented by “AP” in FIG. 4, the non-AP STA 104 may be represented by “STA1” in FIG. 4, and the non-AP STA 106 may be represented by “STA2” in FIG. 4. The AP 102 broadcasts a beacon frame 142_3 carrying a disablement announcement of a DBE operation. In this embodiment, the disablement announcement indicates that the AP 102 intends to trigger a change (e.g., disablement) of the DBE operation at a time instant T2 (e.g., an upcoming TBTT at which a beacon frame 142_4 will be broadcast) for switching AP’s operating BW from BW1 to BW2 (BW2 < BW1) . Since the change of the DBE operation is a disablement of the DBE operation, BW1 may be DBE BW (e.g., DBE BW = 160 MHz (BW160) > BSS BW) , and BW2 may be BSS BW (e.g., BSS BW = 40 MHz (BW40) ) .
[0044] At the time instant T2, the AP 102 broadcasts the beacon frame 142_4. After transmission of the beacon frame 142_4 is completed, the AP 102 broadcasts a frame 148_3 to the non-AP STAs 104 and 106, where the frame 148_3 carries information indicative of a disablement of a first BW-dependent operation (e.g., DSO operation) at the AP 102. After informed of the disablement of the first BW-dependent operation (e.g., DSO operation) , the non-AP STA 104 transmits a frame 134_3 to the AP 102, where the frame 134_3 carries information indicative of a request for the disablement of the first BW-dependent operation (e.g., DSO operation) . After receiving the frame 134_3 from the non-AP STA 104, the AP 102 generates and transmits a frame 144_3 to the non-AP STA 104 as a response that acknowledges successful receipt of the frame 134_3.
[0045] After transmission of the frame 144_3 is completed, the AP 102 broadcasts a frame 148_4 to the non-AP STAs 104 and 106, where the frame 148_4 carries information indicative of a disablement of a second BW-dependent operation (e.g., NPCA operation) at the AP 102. After informed of the disablement of the second BW-dependent operation (e.g., NPCA operation) , the non-AP STA 106 transmits a frame 134_4 to the AP 102, where the frame 134_4 carries information indicative of a request for the disablement of the second BW-dependent operation (e.g., NPCA operation) . After receiving the frame 134_4 from the non-AP STA 106, the AP 102 generates and transmits a frame 144_4 to the non-AP STA 106 as a response that acknowledges successful receipt of the frame 134_4.
[0046] Regarding the embodiment shown in FIG. 4, the AP 102 transmits the frame 144_3 / 144_4 to acknowledge successful receipt of the frame 134_3 / 134_4 carrying information indicative of a request for a disablement of a BW-dependent operation (e.g., NPCA operation or DSO operation) . However, this is for illustrative purposes only, and is not meant to be a limitation of the present invention. In some embodiments of the present invention, transmission of the frame 144_3 / 144_4 may be omitted.
[0047] FIG. 5 is a diagram illustrating a fourth wireless communication scenario in which the proposed serial signaling scheme is employed according to an embodiment of the present invention. The main difference between the third wireless communication scenario shown in FIG. 4 and the fourth wireless communication scenario shown in FIG. 5 is that transmission of the frame 144_3 / 144_4 is absent in the fourth wireless communication scenario. Instead, the request for the disablement of the first BW-dependent operation (e.g., DSO operation) carried by the frame 134_3 is deemed accepted after a predetermined timeout period PTO, and the request for the disablement of the second BW-dependent operation (e.g., NPCA operation) carried by the frame 134_4 is deemed accepted after the predetermined timeout period PTO. A start time of the predetermined timeout period PTO may be aligned with a time instant that depends on transmission of the frame 134_3 / 134_4. Hence, a request for the disablement of a BW-dependent operation (e.g., DSO operation or NPCA operation) will be accepted automatically after the predetermined timeout period PTO is expired. For example, the predetermined timeout period PTO may be announced by the AP 102 in advance. For another example, the predetermined timeout period PTO may be negotiated during association between the AP 102 and the non-AP STA 104 / 106.
[0048] According to a concurrent signaling scheme proposed by the present invention, the control circuit 116 of the AP 102 is configured to trigger the change (e.g., enablement / update / disablement) of the DBE operation at the time instant (e.g., upcoming TTBT) indicated by the enablement / update / disablement announcement, where triggering the change (e.g., enablement / update / disablement) of the DBE operation of the AP 102 and indicating a change (e.g., enablement or disablement) of at least one BW-dependent operation (e.g., NPCA operation and / or DSO operation) at the AP 102 are performed concurrently. For example, triggering the change (e.g., enablement / update / disablement) of the DBE operation of the AP 102 may serve as an implicit enablement / disablement indication of the at least one BW-dependent operation (e.g., NPCA operation and / or DSO operation) at the AP 102. Hence, while the change (e.g., enablement / update / disablement) of the DBE operation is triggered at a certain TTBT, the change (e.g., enablement / disablement) of the at least one BW-dependent operation (e.g., NPCA operation and / or DSO operation) becomes effective at the same TBTT.
[0049] After the change (e.g., enablement / disablement) of the at least one BW-dependent operation (e.g., NPCA operation and / or DSO operation) at the AP 102 becomes effective, the control circuit 126 of the non-AP STA 104 is configured to instruct the network interface circuit 127 (particularly, TX circuit 128 of network interface circuit 127) to transmit a frame (labeled by “REQDBE” ) 134 to the AP 102, and the control circuit 116 of the AP 102 is configured to receive the frame 134 through the network interface circuit 117 (particularly, RX circuit 120 of network interface circuit 117) , where the frame 134 carries information indicative of a request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) . In other words, the non-AP STA 104 transmits the frame 134 for enabling / disabling the BW-dependent operation (e.g., NPCA operation or DSO operation) between the AP 102 and the non-AP STA 104.
[0050] In some embodiments of the present invention, the control circuit 116 of the AP 102 may be configured to instruct the network interface circuit 117 (particularly, TX circuit 118 of network interface circuit 117) to transmit a frame (labeled by “RSP” ) 146 to the non-AP STA 104, where the frame 146 carries information indicative of a response to the request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried in the frame 134. For example, the frame 146 may be an acknowledgement (ACK) frame confirming successful receipt of the frame 134.
[0051] In some embodiments of the present invention, NPCA / DSO enablement / disablement signaling for a case where the AP operates under the DBE BW (which is larger than the BSS BW) and NPCA / DSO enablement / disablement signaling for a case where the AP operates under the BSS BW may be separate.
[0052] For example, the control circuit 116 of the AP 102 is further configured to transmit a frame (labeled by “INDBSS” ) 150 to the non-AP STA 104 / 106 before the change of the DBE operation of the AP 102 is triggered, wherein the frame 150 carries information indicative of a change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) at the AP 102. The change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) may be valid at the time the change of the DBE operation of the AP 102 becomes effective. Regarding the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried by the frame 150, it is valid only during a period in which the AP 102 does not operate in the DBE mode.
[0053] For another example, the control circuit 126 of the non-AP STA 104 is further configured to instruct the network interface circuit 127 (particularly, TX circuit 128 of network interface circuit 127) to transmit a frame (labeled by “REQBSS” ) 136 to the AP 102, and the control circuit 116 of the AP 102 is further configured to receive the frame 136 through the network interface circuit 117 (particularly, RX circuit 120 of network interface circuit 117) , where the frame 136 carries information indicative of a request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) . The request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried by the frame 134 is valid only during a period in which the AP 102 operates in the DBE mode. On the contrary, the request for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) carried by the frame 136 is valid only during a period in which the AP 102 does not operate in the DBE mode.
[0054] FIG. 6 is a diagram illustrating a first wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention. For example, the AP 102 may be represented by “AP” in FIG. 6, the non-AP STA 104 may be represented by “STA1” in FIG. 6, and the non-AP STA 106 may be represented by “STA2” in FIG. 6. Assume that the DSO subband or NPCA primary channel is to be updated and announced by the AP 102. The AP 102 broadcasts a beacon frame 142_1 carrying enablement / update announcement of a DBE operation as well as update announcement of the DSO subband / NPCA primary channel. In this embodiment, the enablement / update announcement indicates that the AP 102 intends to trigger a change (e.g., enablement or update) of the DBE operation at a time instant T1 (e.g., an upcoming TBTT at which a beacon frame 142_2 will be broadcast) for switching AP’s operating BW from BW1 to BW2 (BW2 > BW1) . In a case where the change of the DBE operation is an enablement of the DBE operation, BW1 may be BSS BW (e.g., BSS BW = 40 MHz (BW40) ) , and BW2 may be DBE BW (e.g., DBE BW = 160 MHz (BW160) > BSS BW) . In another case where the change of the DBE operation is an update of the DBE operation, BW1 may be DBE BW1 (e.g., DBE BW1 = 160 MHz (BW160) ) , and BW2 may be DBE BW2 (e.g., DBE BW2 = 320 MHz (BW320) ) . In addition, update of the DSO subband / NPCA primary channel becomes effective at the same time instant when the change of the DBE operation of the AP 102 is effective.
[0055] At the time instant T1, the AP 102 broadcasts the beacon frame 142_2, and enablement of the BW-dependent operations (e.g., NPCA operation and DSO operation) at the AP 102 also becomes effective. After transmission of the beacon frame 142_2 is completed, the non-AP STA 104 transmits a frame 134_1 to the AP 102, where the frame 134_1 carries information indicative of a request for an enablement of a first BW-dependent operation (e.g., DSO operation) . After receiving the frame 134_1 from the non-AP STA 104, the AP 102 generates and transmits a frame 144_1 to the non-AP STA 104 as a response that acknowledges successful receipt of the frame 134_1.
[0056] After transmission of the frame 144_1 is completed, the non-AP STA 106 transmits another frame 134_2 to the AP 102, where the frame 134_2 carries information indicative of a request for an enablement of a second BW-dependent operation (e.g., NPCA operation) . After receiving the frame 134_2 from the non-AP STA 106, the AP 102 generates and transmits a frame 144_2 to the non-AP STA 106 as a response that acknowledges successful receipt of the frame 134_2.
[0057] Regarding the embodiment shown in FIG. 6, the AP 102 transmits the frame 144_1 / 144_2 to acknowledge successful receipt of the frame 134_1 / 134_2 carrying information indicative of a request for an enablement of a BW-dependent operation (e.g., NPCA operation or DSO operation) . However, this is for illustrative purposes only, and is not meant to be a limitation of the present invention. In some embodiments of the present invention, transmission of the frame 144_1 / 144_2 may be omitted.
[0058] FIG. 7 is a diagram illustrating a second wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention. The main difference between the second wireless communication scenario shown in FIG. 7 and the first wireless communication scenario shown in FIG. 6 is that transmission of the frame 144_1 / 144_2 is absent in the second wireless communication scenario. Instead, the request for the enablement of the first BW-dependent operation (e.g., DSO operation) carried by the frame 134_1 is deemed accepted after a predetermined timeout period PTO, and the request for enablement of the second BW-dependent operation (e.g., NPCA operation) carried by the frame 134_2 is deemed accepted after the predetermined timeout period PTO. A start time of the predetermined timeout period PTO may be aligned with a time instant that depends on transmission of the frame 134_1 / 134_2. Hence, a request for an enablement of a BW-dependent operation (e.g., DSO operation or NPCA operation) will be accepted automatically after the predetermined timeout period PTO is expired. For example, the predetermined timeout period PTO may be announced by the AP 102 in advance. For another example, the predetermined timeout period PTO may be negotiated during association between the AP 102 and the non-AP STA 104 / 106.
[0059] FIG. 8 is a diagram illustrating a third wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention. For example, the AP 102 may be represented by “AP” in FIG. 8, the non-AP STA 104 may be represented by “STA1” in FIG. 8, and the non-AP STA 106 may be represented by “STA2” in FIG. 8. The AP 102 broadcasts a beacon frame 142_3 carrying a disablement announcement of a DBE operation. In this embodiment, the disablement announcement indicates that the AP 102 intends to trigger a change (e.g., disablement) of the DBE operation at a time instant T2 (e.g., an upcoming TBTT at which a beacon frame 142_4 will be broadcast) for switching AP’s operating BW from BW1 to BW2 (BW2 < BW1) . Since the change of the DBE operation is a disablement of the DBE operation, BW1 may be DBE BW (e.g., DBE BW = 160 MHz (BW160) > BSS BW) , and BW2 may be BSS BW (e.g., BSS BW = 40 MHz (BW40) ) .
[0060] At the time instant T2, the AP 102 broadcasts the beacon frame 142_4, and disablement of the BW-dependent operations (e.g., NPCA operation and DSO operation) at the AP 102 also becomes effective. After transmission of the beacon frame 142_4 is completed, the non-AP STA 104 transmits a frame 134_3 to the AP 102, where the frame 134_3 carries information indicative of a request for a disablement of a first BW-dependent operation (e.g., DSO operation) . After receiving the frame 134_3 from the non-AP STA 104, the AP 102 generates and transmits a frame 144_3 to the non-AP STA 104 as a response that acknowledges successful receipt of the frame 134_3.
[0061] After transmission of the frame 144_3 is completed, the non-AP STA 106 transmits a frame 134_4 to the AP 102, where the frame 134_4 carries information indicative of a request for a disablement of a second BW-dependent operation (e.g., NPCA operation) . After receiving the frame 134_4 from the non-AP STA 106, the AP 102 generates and transmits a frame 144_4 to the non-AP STA 106 as a response that acknowledges successful receipt of the frame 134_4.
[0062] Regarding the embodiment shown in FIG. 8, the AP 102 transmits the frame 144_3 / 144_4 to acknowledge successful receipt of the frame 134_3 / 134_4 carrying information indicative of a request for disablement of a BW-dependent operation (e.g., NPCA operation or DSO operation) . However, this is for illustrative purposes only, and is not meant to be a limitation of the present invention. In some embodiments of the present invention, transmission of the frame 144_3 / 144_4 may be omitted.
[0063] FIG. 9 is a diagram illustrating a fourth wireless communication scenario in which the proposed concurrent signaling scheme is employed according to an embodiment of the present invention. The main difference between the third wireless communication scenario shown in FIG. 8 and the fourth wireless communication scenario shown in FIG. 9 is that transmission of the frame 144_3 / 144_4 is absent in the fourth wireless communication scenario. Instead, the request for the disablement of the first BW-dependent operation (e.g., DSO operation) carried by the frame 134_3 is deemed accepted after a predetermined timeout period PTO, and the request for disablement of the second BW-dependent operation (e.g., NPCA operation) carried by the frame 134_4 is deemed accepted after the predetermined timeout period PTO. A start time of the predetermined timeout period PTO may be aligned with a time instant that depends on transmission of the frame 134_3 / 134_4. Hence, a request for disablement of a BW-dependent operation (e.g., DSO operation or NPCA operation) will be accepted automatically after the predetermined timeout period PTO is expired. For example, the predetermined timeout period PTO may be announced by the AP 102 in advance. For another example, the predetermined timeout period PTO may be negotiated during association between the AP 102 and the non-AP STA 104 / 106.
[0064] In above embodiments, the non-AP STA 104 / 106 requests for a change (e.g., enablement, parameter update, or disablement) of a BW-dependent operation (e.g., NPCA operation or DSO operation) in response to a change (e.g., enablement or disablement) of the DBE operation of the AP 102. After the change (e.g., enablement, parameter update, or disablement) of the DBE operation of the AP 102 becomes effective, all NPCA / DSO capable non-AP STAs may try to transmit requests for the change (e.g., enablement or disablement) of the BW-dependent operation (e.g., NPCA operation or DSO operation) to the AP 102, causing a network storm issue. To address this issue, the present invention proposes a pre-signaling scheme which allows a non-AP STA to transmit a frame to an AP regardless of whether a change (e.g., enablement, parameter update, or disablement) of a DBE operation of an AP is effective, where the frame carries information indicative of a request for a change (e.g., enablement or disablement) of at least one BW-dependent operation (e.g., NPCA operation, DSO operation, and / or any operation with parameters depending on AP’s operating BW) , and the request for the change (e.g., enablement or disablement) of the at least one BW dependent operation (e.g., NPCA operation, DSO operation, and / or any operation with parameters depending on AP’s operating BW) is effective after the change (e.g., enablement, parameter update, or disablement) of the DBE operation is effective.
[0065] FIG. 10 is a diagram illustrating a first wireless communication scenario in which the proposed pre-signaling scheme is employed according to an embodiment of the present invention. For example, the AP 102 may be represented by “AP” in FIG. 10, the non-AP STA 104 may be represented by “STA1” in FIG. 10, and the non-AP STA 106 may be represented by “STA2” in FIG. 10. The AP 102 intends to trigger an enablement of the DBE operation at a time instant T1 (e.g., an upcoming TBTT at which a beacon frame 142_2 will be broadcast) for switching AP’s operating BW from BSS DBE (e.g., BW40) to DBE BW (e.g., BW160) . Before the time instant T1, the non-AP STA 104 transmits a frame 134_1 to the AP 102, where the frame 134_1 carries information indicative of a request for an enablement of a BW-dependent operation (e.g., DSO operation) , where the request for the enablement of the BW-dependent operation (e.g., DSO operation) is valid only after the enablement of the DBE operation becomes effective. After receiving the frame 134_1 from the non-AP STA 104, the AP 102 generates and transmits a frame 144_1 to the non-AP STA 104 as a response that acknowledges successful receipt of the frame 134_1. The enablement of the DBE operation does not take effect at this moment. Hence, the request for the enablement of the BW-dependent operation (e.g., DSO operation) is not valid until the enablement of the DBE operation is triggered at the time instant T1.
[0066] FIG. 11 is a diagram illustrating a second wireless communication scenario in which the proposed pre-signaling scheme is employed according to an embodiment of the present invention. For example, the AP 102 may be represented by “AP” in FIG. 11, the non-AP STA 104 may be represented by “STA1” in FIG. 11, and the non-AP STA 106 may be represented by “STA2” in FIG. 11. The AP 102 intends to trigger an update of the DBE operation at a time instant T1 (e.g., an upcoming TBTT at which a beacon frame 142_2 will be broadcast) for switching AP’s operating BW from DBW BW1 (e.g., BW160) to DBE BW2 (e.g., BW320) . Before the time instant T1, the non-AP STA 104 transmits a frame 134_1 to the AP 102, where the frame 134_1 carries information indicative of a request for an enablement of a BW-dependent operation (e.g., NPCA operation) , where the request for the enablement of the BW-dependent operation (e.g., DSO operation) is valid only after the update of the DBE operation becomes effective. After receiving the frame 134_1 from the non-AP STA 104, the AP 102 generates and transmits a frame 144_1 to the non-AP STA 104 as a response that acknowledges successful receipt of the frame 134_1. The change (e.g., update) of the DBE operation does not take effect at this moment. Hence, the request for the enablement of the BW-dependent operation (e.g., NPCA operation) is not valid until the update of the DBE operation is triggered at the time instant T1.
[0067] The DSO enablement / disablement (or NPCA enablement / disablement) may be a DBE DSO enablement / disablement (or a DBE NPCA enablement / disablement) which only applies to the DBE BW, and is separate from a DSO enablement / disablement (or a NPCA enablement / disablement) which only applies to the BSS BW. The DBE NPCA / DSO is for the DBE capable non-AP STA. Definitions of DBE DSO enablement / disablement, DBE NPCA enablement / disablement, DSO enablement / disablement, and NPCA enablement / disablement are listed in the following table. However, this is for illustrative purposes only, and is not meant to be a limitation of the present invention. The same concept may also apply to any Wi-Fi features having different operation parameters depending on AP’s operating BW.
[0068] Table 1
[0069] In some embodiments of the present invention, non-AP STA’s NPCA or DSO may only operate when the AP operates in the DBE BW which is capable of supporting NPCA or DSO. The non-AP STA may need to update its supporting parameters of NPCA or DSO if the AP updates its DBE BW (e.g., BW160→BW320) at a certain TBTT.
[0070] In some embodiments of the present invention, AP’s enablement / disablement of NPCA or DSO may only apply when the AP operates in the DBE BW which is capable of supporting NPCA or DSO. When the AP operates in a BW (e.g., BSS BW) not capable of supporting NPCA or DSO, AP’s disablement of NPCA or DSO can be valid automatically.
[0071] The foregoing outlines the features of several embodiments, enabling those skilled in the art to fully appreciate the aspects of the present disclosure. Those skilled in the art should recognize that the present disclosure provides a foundation for designing or modifying other processes and structures to achieve substantially the same functions and / or substantially the same results as those of the embodiments introduced herein. Furthermore, such equivalent arrangements do not deviate from the spirit and scope of the present disclosure, and various changes, substitutions, and alterations may be made without so departing.
Claims
1.A wireless communication method comprising:triggering a change of a dynamic bandwidth expansion (DBE) operation of an access point (AP) ; andafter the change of the DBE operation of the AP is triggered, transmitting a first frame to at least one non-AP station (STA) , wherein the first frame carries information indicative of a change of a first bandwidth (BW) dependent operation at the AP.2.The wireless communication method of claim 1, further comprising:after the first frame is transmitted to the at least one non-AP STA, transmitting a second frame to the at least one non-AP STA, wherein the second frame carries information indicative of a change of a second BW dependent operation at the AP, and the second BW dependent operation is different from the first BW dependent operation.3.The wireless communication method of claim 1, further comprising:after the first frame is transmitted to the at least one non-AP STA, receiving a second frame from the at least one non-AP STA, wherein the second frame carries information indicative of a request for the change of the first BW dependent operation.4.The wireless communication method of claim 3, further comprising:transmitting a third frame to the at least one non-AP STA, wherein the third frame carries information indicative of a response to the request for the change of the first BW dependent operation.5.The wireless communication method of claim 3, wherein the request for the change of the first BW dependent operation is deemed accepted after a predetermined timeout period.6.The wireless communication method of claim 3, further comprising:receiving a third frame from the at least one non-AP STA, wherein the third frame carries information indicative of a request for the change of the first BW dependent operation;wherein the request for the change of the first BW dependent operation carried by the second frame is valid during a period in which the AP operates in a DBE mode; and the request for the change of the first BW dependent operation carried by the third frame is valid during a period in which the AP does not operate in the DBE mode.7.The wireless communication method of claim 1, further comprising:transmitting a second frame to the at least one non-AP STA, wherein the second frame carries information indicative of a change of the first BW dependent operation at the AP;wherein the change of the first BW dependent operation indicated by the first frame is valid during a period in which the AP operates in a DBE mode; and the change of the first BW dependent operation indicated by the second frame is valid during a period in which the AP does not operate in the DBE mode.8.The wireless communication method of claim 1, wherein the change of the DBE operation of the AP is an enablement of the DBE operation or an update of the DBE operation, and the change of the first BW dependent operation is an enablement of the first BW dependent operation; orwherein the change of the DBE operation of the AP is a disablement of the DBE operation, and the change of the first BW dependent operation is a disablement of the first BW dependent operation.9.The wireless communication method of claim 1, wherein the BW dependent operation is a non-primary channel access (NPCA) operation.10.The wireless communication method of claim 1, wherein the BW dependent operation is a dynamic subband operation (DSO) operation.11.A wireless communication method comprising:triggering a change of a dynamic bandwidth expansion (DBE) operation of an access point (AP) ; andindicating a change of at least one bandwidth (BW) dependent operation at the AP;wherein triggering the change of the DBE operation of the AP and indicating the change of the at least one BW dependent operation at the AP are performed concurrently.12.The wireless communication method of claim 11, further comprising:after the change of the at least one BW dependent operation is indicated, receiving a first frame from the at least one non-AP STA, wherein the first frame carries information indicative of a request for the change of the at least one BW dependent operation.13.The wireless communication method of claim 12, further comprising:transmitting a second frame to the at least one non-AP STA, wherein the second frame carries information indicative of a response to the request for the change of the at least one BW dependent operation.14.The wireless communication method of claim 12, wherein the request for the change of the at least one BW dependent operation is deemed accepted after a predetermined timeout period.15.The wireless communication method of claim 12, further comprising:receiving a second frame from the at least one non-AP STA, wherein the second frame carries information indicative of a request for the change of the at least one BW dependent operation;wherein the request for the change of the at least one BW dependent operation carried by the first frame is valid during a period in which the AP operates in a DBE mode; and the request for the change of the at least one BW dependent operation carried by the second frame is valid during a period in which the AP does not operate in the DBE mode.16.The wireless communication method of claim 11, further comprising:transmitting a frame carrying information indicative of a change of the at least one BW dependent operation at the AP;wherein the change of the at least one BW dependent operation indicated by the frame is valid during a period in which the AP does not operate in the DBE mode.17.The wireless communication method of claim 11, wherein the change of the DBE operation of the AP is an enablement of the DBE operation or an update of the DBE operation, and the change of the at least one BW dependent operation is an enablement of the at least one BW dependent operation; orwherein the change of the DBE operation of the AP is a disablement of the DBE operation, and the change of the at least one BW dependent operation is a disablement of the at least one BW dependent operation.18.The wireless communication method of claim 11, wherein the BW dependent operation is a non-primary channel access (NPCA) operation.19.The wireless communication method of claim 11, wherein the BW dependent operation is a dynamic subband operation (DSO) operation.20.A wireless communication method comprising:receiving a frame from a non-AP STA regardless of whether a change of a dynamic bandwidth expansion (DBE) operation of an access point (AP) is effective, wherein the frame carries information indicative of a request for a change of at least one bandwidth (BW) dependent operation, and the request for the change of the at least one BW dependent operation is effective after the change of the DBE operation is effective; andtriggering the change of the DBE operation of the AP.