Transmission on a mixed dynamic frequency selection channel during channel availability check

Abstract

A method, system, and device for wireless communication are described. An access point (AP) may update a bitmap (e.g., an Extended High Throughput (EHT) operation (Ops) information element (IE) disabled subchannel bitmap) indicating which channels in a band are available and which are unavailable. In some examples, the AP may update the bitmap during a channel availability check (CAC) based on whether various channels are DFS channels or non-DFS channels. During the CAC, the AP may transmit beacons to one or more stations (STAs) on available non-DFS channels (e.g., instead of waiting until the CAC performs any beacon transmission).

Description

Technical Field

[0001] (Cross - reference to Related Applications)

[0001] This patent application claims the benefit of Indian Patent Application No. 202241032748 by Mr. Dutta titled "TRANSMISSIONS ON MIXED DYNAMIC FREQUENCY SELECTION CHANNELS DURING CHANNEL AVAILABILITY CHECK", filed on June 8, 2022, and assigned to the assignee of this application.

Background Art

[0002]

[0002] The following relates to wireless communication, including transmissions on mixed dynamic frequency selection channels during channel availability checks.

[0003]

[0003] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, and broadcast. These systems may be multi-connectivity systems capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless network, such as a wireless local area network (WLAN) like a Wi-Fi (i.e., Institute of Electrical and Electronics Engineers (IEEE) 802.11) network, may include access points (APs) that can communicate with one or more stations (STAs) or mobile devices. The AP(s) can be coupled to a network such as the Internet and enable a mobile device to communicate through the network (or communicate with other devices coupled to the access point). A wireless device may communicate bi-directionally with a network device. For example, in a WLAN, an STA can communicate with an associated AP via downlink (DL) communication and uplink (UL) communication. DL (or forward link) may refer to a communication link from the AP to the station, and UL (or reverse link) may refer to a communication link from the station to the AP.

Summary of the Invention

[0004]

[0004] The techniques described relate to an improved method, system, device, or apparatus that supports transmission on a mixed dynamic frequency selection (DFS) channel during a channel availability check. Generally, an access point (AP) may update a bitmap (e.g., an extremely high throughput (EHT) operations (Ops) information element (IE) invalidation subchannel bitmap) indicating which channels in a band are available and which are unavailable. In some examples, the AP may update the bitmap during a channel availability check (CAC) based on whether various channels are DFS channels or non-DFS channels. During the CAC, the AP may transmit a beacon to one or more stations (STAs) on an available non-DFS channel (e.g., instead of waiting for the CAC to perform any beacon transmission).

[0005]

[0005] A method for wireless communication at an access point is described. The method may include identifying that a communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type, performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels, and transmitting one or more beacons to stations on at least one of the one or more second channels during the channel availability check procedure.

[0006]

[0006] An apparatus for wireless communication at an access point is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to identify that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type, perform a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels, and transmit one or more beacons locally on at least one of the one or more second channels during the channel availability check procedure.

[0007]

[0007] Another apparatus for wireless communication at an access point is described. The apparatus may include means for identifying that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type, means for performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels, and means for transmitting one or more beacons locally on at least one of the one or more second channels during the channel availability check procedure.

[0008]

[0008] A non-transitory computer-readable medium storing code for wireless communication at an access point is described. The code may include instructions executable by a processor to identify that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type, perform a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels, and transmit one or more beacons locally on at least one of the one or more second channels during the channel availability check procedure.

[0009]

[0009] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, one or more first channels of a first dynamic frequency selection type can be dynamic frequency selection channels, and one or more second channels of a second dynamic frequency selection type can be non-dynamic frequency selection channels.

[0010]

[0010] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein can further include operations, features, means, or instructions for updating a bitmap to indicate that one or more first channels can be unavailable for transmission during a channel availability check procedure, and transmitting one or more beacons can be based on updating the bitmap.

[0011]

[0011] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein can further include operations, features, means, or instructions for including a bitmap in one or more beacons transmitted locally during a channel availability check procedure.

[0012]

[0012] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein update a bitmap to indicate that at least one of one or more first channels can be available for transmission based on a channel availability check procedure upon completion of the channel availability check procedure, and after completion of the channel availability check procedure, transmit one or more additional beacons on at least one of one or more second channels and at least one of one or more first channels according to the updated bitmap, and the updated bitmap can be included in one or more additional beacons. The operations, features, means, or instructions for this can be further included.

[0013]

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein update a bitmap to indicate that at least one of one or more first channels may be unavailable for transmission based on a channel availability check procedure when the channel availability check procedure is completed, and after the channel availability check procedure is completed, start a second channel availability check procedure to determine whether radar can be used on one or more additional first channels, and when the second channel availability check procedure is completed, update the bitmap to indicate that at least one of one or more additional first channels may be available or unavailable for transmission based on the second channel availability check procedure. It may further include operations, features, means, or instructions for this purpose.

[0014]

[0014] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, including a bitmap in one or more beacons may include operations, features, means, or instructions for transmitting the bitmap in the very high throughput operation information element (IE) of one or more beacons.

[0015]

[0015] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for including, together with the bitmap in one or more beacons, an indication of the duration for which the bitmap may be valid.

[0016]

[0016] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the duration may be indicated in terms of time, transmission time intervals, or units of beacons.

[0017]

[0017] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining that a communication band may be associated with a low-latency network, and updating a bitmap may be based on that determination.

[0018]

[0018] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, each bit of the bitmap corresponds to one of one or more first channels or one of one or more second channels.

[0019]

[0019] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the access point includes a telephone and the station includes a virtual reality device.

[0020]

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for monitoring one or more first channels for radar use during a channel availability check procedure while simultaneously transmitting one or more beacons, and determining whether radar detected on one or more of the first channels meets a threshold amount of interference.

Brief Description of the Drawings

[0021]

Figure 1

[0021] An example of a wireless communication system that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check according to an aspect of the present disclosure is shown.

Figure 2A

[0022] An example of a wireless communication system that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is shown.

Figure 2B

Figure 3

[0023] An example of a timeline that supports transmission on a mixed dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is shown.

Figure 4

[0024] An example of a process flow that supports transmission on a mixed dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is shown.

Figure 5

[0025] A block diagram of a device that supports transmission on a mixed dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is shown.

Figure 6

Figure 7

[0026] A block diagram of a communication manager that supports transmission on a mixed dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is shown.

Figure 8

[0027] A diagram of a system that includes a device that supports transmission on a mixed dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is shown.

Figure 9

[0028] A flowchart showing a method that supports transmission on a mixed dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is shown.

Figure 10

Figure 11

DETAILED DESCRIPTION OF THE INVENTION

[0022]

[0029] In some examples, an access point (AP) may operate in the 5 GHz band. In some examples, the AP may operate in a low latency network and communicate on one or more dynamic frequency selection (DFS) channels. For example, on a 160 MHz channel, the AP may operate on one or more 20 MHz DFS channels. These channels may also be used for radar signaling. Thus, an AP using a DFS channel may perform an essential channel availability check (CAC) before beacon transmission. During the CAC, the AP may monitor for radar (e.g., on a DFS channel). While monitoring for radar, the AP may refrain from transmitting and thus may not transmit any beacons during the CAC. The CAC may last for several seconds or minutes. During this time period, one or more stations (STAs) may not be able to establish or maintain a connection with the AP, resulting in communication failure, inability to establish a connection, service interruption, failure of one or more operations, and a poor user experience.

[0023]

[0030] As described herein, an AP may update a bitmap (e.g., an Extended High Throughput (EHT) Operations (Ops) Information Element (IE)) indicating which channels in a band are available and which are unavailable. In some examples, the AP may update the bitmap during Channel Access Control (CAC) based on whether various channels are DFS channels or non-DFS channels. During CAC, the AP may transmit beacons to one or more STAs on available non-DFS channels (e.g., instead of waiting for CAC to perform any beacon transmissions). This may enable the AP to continue beacon transmissions during the CAC procedure instead of being unavailable to the STA. Such techniques may then support low-latency communication and avoid unnecessary delays in services (e.g., for virtual reality (VR) devices or other low-latency operations). Upon completion of CAC, the AP may update the bitmap to indicate that the full channel is available (e.g., if CAC was successful on a DFS channel) and may transmit beacons on the full channel. If CAC was not successful on one or more DFS channels, the STA may update the bitmap to indicate the unavailable DFS channels and may initiate a second CAC to identify available DFS or other channels. In some examples, the AP may transmit an indication of the updated bitmap, an indication of the duration for which the bitmap is valid, or both (e.g., in a beacon transmitted during CAC).

[0024]

[0031] First, aspects of the present disclosure are described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated by and described with reference to wireless communication systems, timelines, and process flows. Aspects of the present disclosure are further illustrated by and described with reference to diagrams of apparatus, diagrams of systems, and flowcharts regarding transmissions on hybrid dynamic frequency selection channels during channel availability checks.

[0025]

[0032] FIG. 1 shows a wireless local area network (WLAN) 100 (also known as a Wi-Fi network) configured in accordance with various aspects of the present disclosure. WLAN 100 may include an AP 105 and a plurality of associated STAs 115, and the STAs 115 may represent devices such as mobile stations, personal digital assistants (PDAs), other handheld devices, netbooks, notebook computers, tablet computers, laptops, display devices (e.g., TVs, computer monitors, etc.), printers, etc. The AP 105 and the associated stations 115 may represent a basic service set (BSS) or an extended service set (ESS). The various STAs 115 within the network can communicate with each other through the AP 105. Also shown is the coverage area 110 of the AP 105, which may represent the basic service area (BSA) of the WLAN 100. Extended network stations (not shown) associated with the WLAN 100 may be connected to a wired distribution system or a wireless distribution system that may enable a plurality of APs 105 to be connected in an ESS.

[0026]

[0033] In some examples, the AP105 may update a bitmap (e.g., an EHT Ops IE) indicating which channels in a band are available and which are unavailable. In some examples, the AP105 may update the bitmap during CAC based on whether various channels are DFS channels or non-DFS channels. During CAC, the AP105 may transmit beacons to one or more STAs 115 on available non-DFS channels (e.g., instead of waiting until CAC performs any beacon transmissions). This may enable the AP105 to continue beacon transmissions during the CAC procedure instead of being unavailable to the STA 115. Such techniques may then support low-latency communication and avoid unnecessary delays in services (e.g., for virtual reality (VR) devices, or other low-latency operations). Upon expiration of the CAC, the AP105 may update the bitmap to indicate that the full channel is available (e.g., if CAC was successful on a DFS channel) and may transmit beacons on the full channel.

[0027]

[0034] Although not shown in FIG. 1, the STA115 may be located at the intersection of two or more coverage areas 110 and may be associated with two or more APs 105. A set of a single AP 105 and an associated STA115 may be referred to as a BSS. An ESS is a set of connected BSSs. A distribution system (not shown) may be used to connect the APs 105 within an ESS. In some cases, the coverage area 110 of an AP 105 may be divided into sectors (also not shown). The WLAN 100 may include APs 105 of different types (e.g., metropolitan area, home network, etc.) along with various overlapping coverage areas 110. Two STAs 115 may also communicate directly via a direct wireless link 125 regardless of whether both STAs 115 are within the same coverage area 110. Examples of direct wireless links 120 may include Wi-Fi Direct connections, Wi-Fi Tunneled Direct Link Setup (TDLS) links, and other group connections. The STAs 115 and APs 105 may communicate according to WLAN radio and baseband protocols from the physical layer and the medium access control (MAC) layer of IEEE 802.11 and versions including, but not limited to, 802.11b, 802.11g, 802.11a, 802.11n, 802.11ac, 802.11ad, 802.11ah, 802.11ax, 80211be, etc.

[0028]

[0035] In other implementations, a peer-to-peer connection or an ad hoc network may be implemented within the WLAN 100. In some cases, the STA 115 (or the AP 105) may be detectable by the central AP 105, but may not be detectable by other STAs 115 within the coverage area 110 of the central AP 105. For example, one STA 115 may be at one end of the coverage area 110 of the central AP 105, while another STA 115 may be at the other end. Thus, both STAs 115 can communicate with the AP 105, but cannot receive transmissions from the other. As a result, the two STAs 115 cannot refrain from transmitting overlappedly, so that transmissions for these STAs 115 may collide in a contention-based environment (e.g., carrier sense multiple access with collision avoidance (CSMA / CA)). STAs 115 that are not identifiable but are within the same coverage area 110 may be known as hidden nodes. CSMA / CA may be supplemented by the exchange of a request-to-send (RTS) packet transmitted by the transmitting STA 115 (or the AP 105) and a clear-to-send (CTS) packet transmitted by the receiving STA 115 (or the AP 105). This may warn other devices within the range of the transmitter and receiver not to transmit during the duration of the most important transmission. Thus, RTS / CTS may help mitigate the hidden node problem.

[0029]

[0036] FIG. 2A shows an example of a wireless communication system 200 that supports transmission on a hybrid dynamic frequency selection channel during channel availability checking according to one or more aspects of the present disclosure. The wireless communication system 200 may include an AP 105-a and an STA 115-a, which may be examples of corresponding devices described with reference to FIG. 1. In some examples, the AP 105-a may provide services to one or more STAs 115-a within the coverage area 110-a.

[0030]

[0037] AP105-a may transmit one or more beacons 215 (e.g., periodically). The beacon 215 may enable any STA115 within the wireless range of AP105-a to establish or maintain a communication link with the WLAN. The beacon 215 may carry capability information about one or more BSSs managed by AP105-a. Thus, if AP105-a refrains from transmitting the beacon 215 over a period of time, STA115-a may not be able to establish or maintain a connection with AP105-a, resulting in communication failures, retransmission of wireless communications, increased latency and delay at STA115-a, and a degradation of the user experience. For example, AP105-a and STA115-a may support virtual reality operations (e.g., AP105-a may be a portable device, gaming system, smart device, smartphone, user equipment, etc.). If AP105-a does not transmit the beacon 215, virtual reality operations may be stalled or otherwise fail due to the absence of the beacon 215 from AP105-a.

[0031]

[0038] In some examples, AP105-a may operate in one or more bands (e.g., the 5 GHz band). Radar transmissions may also be performed via one or more channels in the 5 GHz band. In some examples, STA115-a may support dynamic frequency selection (DFS) procedures to facilitate communication on the 5 GHz band without experiencing interference or disruption from radar transmissions. AP105-a may communicate with one or more STA115-a via one or more channels or subchannels of various types. AP105-a may communicate on one or more first DFS type channels (e.g., DFS channels) and may also communicate on one or more second DMS type channels (e.g., non-DFS channels). DFS channels may support a spectrum sharing mechanism that enables a WLAN device operating in the 5 GHz band to coexist with a radar system operating in the same band.

[0032]

[0039] The DFS procedure may provide for AP105-a to perform a channel availability check (CAC) 210 to search for radar pulses in the frequency channels in which AP105-a is operating or during an automatic channel scan. During CAC210, AP105-a may refrain from transmitting beacon 215 and instead may monitor for radar signals. If AP105-a does not encounter any radar during CAC210 (e.g., during the CAC time period), AP105-a may perform transmission and reception on one or more channels being monitored during CAC210 (e.g., including transmission of beacon 215) upon completion of CAC210. If AP105-a detects a radar signal on the current operating channel (e.g., a 20 MHz channel within the 5 GHz band) during CAC210, AP105-a may stop operating on that channel for a period of time (e.g., for 30 minutes). AP105-a may then select a new channel and may repeat the DFS procedure (e.g., initiate a second CAC210 on the new channel) until an available channel (e.g., one that does not encounter radar) is identified.

[0033]

[0040] CAC210 may require a defined (e.g., standardized) time period (e.g., 30 seconds, 1 minute, 30 minutes, etc.). AP105-a may not perform any transmission or reception for the BSS within CAC210, which may affect the network traffic within the time frame of CAC210. If AP105-a refrains from transmitting beacon 215 throughout CAC210, one or more communications or operations between AP105-a and STA115-a may fail (e.g., STA115-a may not be able to discover and establish a connection with AP105-a, or may not be able to maintain communication with AP105-a). For example, in a low-latency network that supports (e.g., where STA115-a is a VR device, an AR device, an extended reality (XR) device, etc., and AP105-a is a soft AP such as a phone), if the STA-AP has to wait for a beacon throughout the entire CAC procedure duration, time may be wasted, the connection may fail, the operation may be suspended, etc., resulting in an insufficient user experience.

[0034]

[0041] In some examples, AP105-a may be configured to operate according to the EHT (Extremely High Throughput) mode on one or more channels (e.g., in the 5 GHz band). In such examples, AP105-a may identify (e.g., generate, or be configured using) a list of DFS channels and non-DFS channels. AP105-a may identify or indicate which channels should or should not be used according to a bitmap (e.g., an EHT Ops IE that may be referred to as an inactivation subchannel bitmap). In some examples, the bitmap may indicate which channels are available for use and which channels are not available for use. The bitmap may indicate whether a subchannel is inactivated, activated, or available for a fixed period of time until otherwise indicated. The bitmap may indicate available or unavailable channels, subchannels, bands, or portions of a band, bandwidth, or any combination thereof. Although channels or subchannels are described herein, the bitmap as described (e.g., inactivation subchannel bitmap) may be implemented according to techniques described for enabling or disabling any subdivision of frequency resources (e.g., channels, subchannels, bands, bandwidth, etc.). In some examples, AP105-a may communicate (e.g., with one or more STA115) using channels indicated as available according to the bitmap and refrain from communicating (e.g., with one or more STA115) using channels indicated as unavailable according to the bitmap.

[0035]

[0042] According to the techniques described herein, AP105-a may mark the DFS channels as unavailable or not to be used in CAC210 (e.g., update a bitmap to indicate that the DFS channels in the 5 GHz band are unavailable). In such an example, AP105-a may refrain from transmitting or receiving on an unavailable DFS channel in CAC210 (e.g., transmitting beacon 215). However, AP105-a may transmit beacon 215 on an available non-DFS channel in CAC210 (e.g., according to the updated bitmap). AP105-a may continue beacon transmission on a non-DFS channel during the CAC duration (e.g., at a lower bandwidth). For example, AP105-a may refrain from transmitting on a DFS channel (e.g., a 20 MHz channel in the 5 GHz band), but may continue beacon transmission on a non-DFS channel (e.g., a 20 MHz channel on a different band).

[0036]

[0043] When CAC210 expires, AP105-a may update a bitmap (e.g., a deactivation subchannel bitmap) during EHT ops to indicate full bandwidth support (e.g., if AP105-a did not encounter any radar on the DFS channel in CAC210). In some examples (e.g., for in-service radar monitoring), AP105-a may encounter radar on one or more DFS channels in CAC210. In such examples, STA115-a may update a bitmap (e.g., a deactivation subchannel bitmap) to silence out (e.g., mark as unavailable) channels (e.g., 20 MHz channels or subchannels) affected by the radar. AP105-a may initiate another CAC210 and refrain from beacon transmission on unavailable channels or subchannels, but may continue beacon transmission on available channels or subchannels according to the bitmap. That is, AP105-a may silence out 20 MHz subchannels affected by the radar, but may provide service to the remaining available channels (e.g., non-DFS 20 MHz subchannels) while performing CSA or CAC210 on the DFS subchannels.

[0037]

[0044] By implementing the techniques described herein, AP105-a and STA115-a can continue to support connectivity and various operations during CAC210 (e.g., during a timeout period associated with CAC210). Continuous transmission (e.g., of beacon 215, data, or other transmission types) on available channels (e.g., non-DFS channels) in CAC210 can support continuous interruption-free communication, improved communication, and more efficient use of available resources between AP105-a and STA115-a, and can avoid interruptions to operations (e.g., including low latency communication, virtual reality (VR), or augmented reality (AR) operations).

[0038]

[0045] Figure 2B shows an example of a wireless communication system 201 that supports transmission on a hybrid dynamic frequency selection channel during channel availability checking according to one or more aspects of the present disclosure. The wireless communication system 201 may include an AP105-b and a STA115-b, which may be examples of corresponding devices described with reference to FIGS. 1 and 2.

[0039]

[0046] In some examples, the UE115-b (e.g., a smartphone) may function as a soft AP. In such examples, the UE115-b may perform low-latency communication with a device 220 (e.g., a VR device such as a VR headset or an AR device). The device 220 may be connected to the UE115-b via a soft AP link, and the UE115-b may be connected to a WLAN via a WLAN AP105-b. In such examples, as described herein, the UE115-b (e.g., functioning as a soft AP) may transmit one or more beacons (e.g., beacon 215) to the device 220. As described with reference to FIGS. 2A, 3, and 4, the UE115-b may perform beacon transmission during CAC. For example, the UE115-b may mark a DFS channel as unavailable or not to be used during CAC210 (e.g., update a bitmap to indicate that a DFS channel in the 5 GHz band is unavailable). In such examples, the UE115-b may refrain from transmitting or receiving on an unavailable DFS channel during CAC210 (e.g., transmitting beacon 215). However, the UE115-b may transmit beacon 215 on an available non-DFS channel during CAC210 (e.g., according to an updated bitmap). The UE115-b may continue beacon transmission on a non-DFS channel during the CAC duration (e.g., at a lower bandwidth).

[0040]

[0047] When CAC210 expires, UE115-b may update a bitmap (e.g., an inactivation subchannel bitmap) during EHT ops to indicate full bandwidth support (e.g., if UE115-b did not encounter any radar on the DFS channel during CAC210). In some examples (e.g., for in-service radar monitoring), UE115-b may encounter radar on one or more DFS channels during CAC210. In such examples, UE115-b may update the bitmap (e.g., the inactivation subchannel bitmap) to silence out (e.g., mark as unavailable) the channels affected by the radar (e.g., 20 MHz channels or subchannels). UE115-b may initiate another CAC210 and refrain from beacon transmission on unavailable channels or subchannels, but may continue beacon transmission on available channels or subchannels according to the bitmap. That is, UE115-b may silence out the 20 MHz subchannels affected by the radar, but may provide service to the remaining available channels (e.g., non-DFS 20 MHz subchannels) while performing CSA or CAC210 on the DFS subchannels.

[0041]

[0048] By implementing the techniques described herein, UE115-b and device 220 can continue to support connectivity and various operations during CAC210 (e.g., during a timeout period associated with CAC210). Continuous transmission (e.g., of beacon 215, data, or other transmission types) on available channels (e.g., non-DFS channels) during CAC210 can support continuous, interruption-free communication, improved communication, and more efficient use of available resources between UE115-b and device 220, and can avoid interruptions to operations (e.g., including low-latency communication, VR operations, or AR operations). The techniques described with reference to FIGS. 3 and 4 referring to the AP and UE can be similarly implemented by UE115-b and device 220 (e.g., operating in soft AP mode).

[0042]

[0049] Figure 3 shows an example of a timeline 300 that supports transmission on a hybrid dynamic frequency selection channel during channel availability checking, according to one or more aspects of the present disclosure. Timeline 300 may implement or be implemented by aspects of WLAN 100 and wireless communication systems 200 and 201. For example, an AP (e.g., AP105-a) and a STA (e.g., STA115-a) may implement timeline 300 and may implement the techniques described with reference to FIGS. 1-2. In some examples, such APs and STAs may communicate with each other according to the techniques described herein (e.g., may support operations including VR operations or AR operations). In some examples, AP105-a may be a phone, and STA115-c may be a VR device (e.g., a headset, a wearable device, goggles, a controller, etc.).

[0043]

[0050] As described in more detail with reference to FIGS. 2A and 2B, the AP may transmit one or more beacons 305 that support connection establishment and maintenance. In some examples (e.g., when operating on the 5 GHz band), the AP may initiate CAC 310. Before initiating CAC 310 (e.g., or at the start of CAC 310 or during CAC 310), the AP may update a bitmap (e.g., an inactivation subchannel bitmap). For example, at time T0, the AP may update the bitmap to indicate that one or more DFS channels are unavailable.

[0044]

[0051] In CAC310, the AP may transmit beacon 305 according to the updated bitmap. For example, the AP may transmit a 5GHz beacon 305 having a set of bitmaps for all DFS 20MHz subchannels. In such an example, the AP may transmit beacon 305 on non-DFS 20MHz subchannels, but refrain from transmitting beacon 305 on DFS 20MHz subchannels. The AP may monitor the DFS 20MHz subchannels for radar while simultaneously transmitting beacon 305 on non-DFS 20MHz subchannels.

[0045]

[0052] Upon expiration of CAC310, the AP may update the bitmap. For example, at time T1, the AP may determine whether it detected any radar on the unavailable channels it monitored (e.g., DFS 20MHz subchannels). For example, the AP may determine whether any detected energy satisfied one or more thresholds. The AP may then update the bitmap accordingly. For example, if no radar was detected on one or more of the DFS channels, the AP may update the bitmap to indicate that those DFS channels are available (e.g., set the bits of the bitmap to available). For example, if the AP did not detect radar on a DFS channel, the AP may set the bitmap to indicate full bandwidth support or availability. In some examples, at T1, since the CAC310 duration is served, the AP may update the bitmap and pause it for each AP configuration.

[0046]

[0053] In some examples, the AP may detect radar on one or more of the DFS channels within the CAC 310. In such examples, the AP may update the bitmap accordingly. For example, the AP may set the bit of the bitmap (e.g., associated with the identified channel where radar is detected) to indicate that the channel where radar is detected is unavailable. In such examples, the AP may also initiate a second CAC and monitor one or more additional channels (e.g., one or more additional DFS channels) to determine channel availability. Upon expiration of the second CAC, the AP may update the bitmap again (e.g., indicate that the channel where radar is detected is unavailable and indicate that the channels where radar is not detected are available).

[0047]

[0054] FIG. 4 shows an example of a process flow 400 that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check, according to one or more aspects of the present disclosure. The process flow 400 may include STA115-c and AP105-c, which may be examples of corresponding devices described with reference to FIGS. 1-3.

[0048]

[0055] At 410, the AP105-c may initiate a CAC (e.g., having a CAC timeout period). In some examples, the AP105-c may identify that the communication band includes one or more first channels of a first DFS type (e.g., DFS channels) and one or more second channels of a second DFS type (e.g., non-DFS channels). The AP105-c may initiate a CAC procedure to determine whether radar is being used on one or more of the first channels (e.g., DFS channels).

[0049]

[0056] In some examples, at 405, AP105-c may update a bitmap (e.g., an EHT Ops IE disabling subchannel bitmap). AP105-c may update the bitmap to indicate that one or more of the DFS channels are unavailable (e.g., each bit corresponding to a DFS channel may be set to indicate that the DFS channel is unavailable). At 410, AP105-c may update the bitmap before starting the CAC procedure (e.g., to indicate that the shown channel is unavailable during the CAC timeout period), or may update the bitmap at the start of the CAC procedure or during the CAC timeout period. In some cases, AP105-c may determine that one or more conditions are met and, based on that determination, may update the bitmap. For example, AP105-a may determine that a wireless channel (e.g., one or more DFS channels, one or more non-DFS channels, or both) is associated with a low latency network. In such an example, AP105-a may update the bitmap based on the determination that the channel is associated with a low latency network.

[0050]

[0057] At 415, AP105-c may transmit one or more beacons on at least one of the one or more non-DFS channels (e.g., to STA115-c during the CAC timeout period) according to the updated bitmap. At 415, AP105-c may transmit the beacons periodically (e.g., a first beacon on a non-DFS channel at 415-a and a second beacon on a non-DFS channel at 415-b). AP105-c may not transmit on any of the DFS channels (e.g., indicated as unavailable on the bitmap updated at 405). In some examples, AP105-c may monitor the DFS channels for radar use during the CAC procedure while transmitting one or more beacons simultaneously, and may determine whether the radar detected on the DFS channel meets a threshold amount of interference.

[0051]

[0058] In some examples, the AP105-c may include an indication of an updated bitmap in one or more of the beacons (e.g., at 415 or sent prior to starting the CAC procedure). For example, the AP105-c may update the bitmap at 405 and may include an indication of the updated bitmap in the beacon. In some examples, the AP105-a may include a bitmap in the EHT ops IE of the beacon. The AP105-a may include in the beacon an indication of the duration for which the bitmap is valid (e.g., a fixed amount of time, a number of time intervals, a number of beacons, a number of periods for periodic beacons, etc.). For example, the AP105-a may send (e.g., in the beacon or in a separate message) an indication of the duration for which the deactivated subchannel bitmap is held (e.g., target beacon transmission time (TBTT) information). Such information may enable other devices (e.g., the STA115 or the AP105) to determine channel availability and plan traffic accordingly. For example, the AP105-a may signal the remaining time (e.g., a timer, an amount of time, a counter, a number of beacon slots, etc.) for a DFS channel. Such information may be included in a duration indicator element.

[0052]

[0059] In such examples, the STA115-c may receive a beacon that includes an indication of an updated bitmap and may accordingly monitor one or more channels. For example, the STA115-c may monitor non-DFS channels for beacons (e.g., at 415-a, 415-b, etc.) but may refrain from monitoring beacons on the DFS channel (e.g., for the duration for which the bitmap is valid, according to the updated bitmap). This may result in more efficient power consumption in the STA115-c, or more efficient reception of the beacon 415 and consistent communication via a reliable connection with the AP105-c.

[0053]

[0060] At 420, upon completion of the CAC procedure (e.g., upon expiration of the CAC timeout period), AP105-c may update a bitmap based on the CAC procedure. For example, AP105-c may not detect any radar during the CAC procedure on one or more DFS channels (e.g., any detected energy may not meet a threshold amount of energy). In such an example, at 420, AP105-c may update the bitmap to indicate that at least one of one or more DFS channels is available for transmission, at least partially based on the CAC procedure. For example, AP105-c may update the bitmap to indicate full bandwidth availability. In such an example, at 425, AP105-c may transmit one or more additional beacons on at least one of the DFS channels (e.g., and on any available non-DFS channels) according to the updated bitmap. In some examples, AP105-c may also include an indication of the updated bitmap in one or more additional beacons (e.g., at 425 after updating the bitmap at 420).

[0054]

[0061] In some examples, AP105-c may detect radar on one or more of the DFS channels. In such examples, at 420, AP105-c may update a bitmap upon completion of the CAC procedure to indicate that one or more of the DFS channels are unavailable. AP105-c may also initiate a second CAC procedure (e.g., upon completion of the CAC procedure and upon updating the bitmap) to determine whether radar is being used on one or more additional DFS channels. Upon completion of the second CAC procedure, AP105-c may update the bitmap again to indicate whether an additional DFS channel is available for transmission based on the second CAC procedure. In some examples, AP105-c may perform consecutive or repeated CAC procedures to identify available DFS channels. During each CAC procedure, AP105-c may transmit beacons on channels (e.g., DFS channels or non-DFS channels or both) indicated as available according to the most recent update of the bitmap.

[0055]

[0062] FIG. 5 shows a block diagram 500 of a device 505 that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check, according to one or more aspects of the present disclosure. Device 505 may be an example of an aspect of an AP described herein. Device 505 may include a receiver 510, a transmitter 515, and a communication manager 520. Device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0056]

[0063] Receiver 510 may provide means for receiving information such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels related to transmission on a mixed dynamic frequency selection channel during channel availability checking). The information may be passed to other components of device 505. Receiver 510 may utilize a single antenna or a set of multiple antennas.

[0057]

[0064] Transmitter 515 may provide means for transmitting signals generated by other components of device 505. Transmitter 515 may utilize a single antenna or a set of multiple antennas.

[0058]

[0065] Communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be examples of means for implementing various aspects of transmission on a mixed dynamic frequency selection channel during channel availability checking, as described herein. For example, communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may support a method for implementing one or more of the functions described herein.

[0059]

[0066] In some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may be configured as a processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gates or transistor logic, discrete hardware components, or any combination thereof that can be configured as means for performing the functions described in this disclosure or that otherwise supports such means. In some examples, a processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by the processor executing instructions stored in the memory).

[0060]

[0067] Additionally or alternatively, in some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). When implemented in code executed by a processor, the functions of the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, or any combination of these or other programmable logic devices that can be configured as means for performing the functions described in this disclosure or that otherwise supports such means.

[0061]

[0068] In some examples, the communication manager 520 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using, or otherwise in cooperation with, the receiver 510, the transmitter 515, or both. For example, the communication manager 520 may receive information from the receiver 510, transmit information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.

[0062]

[0069] The communication manager 520 may support wireless communication at an access point according to the examples disclosed herein. For example, the communication manager 520 may be configured as, or support, means for identifying that a communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type. The communication manager 520 may be configured as, or support, means for performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels. The communication manager 520 may be configured as, or support, means for transmitting one or more beacons locally on at least one of the one or more second channels during the channel availability check procedure.

[0063]

[0070] By including or configuring a device 505 (e.g., a processor that controls or is otherwise coupled to the receiver 510, the transmitter 515, the communication manager 520, or a combination thereof) with the communication manager 520 according to the examples described herein, techniques for beacon transmission during a CAC procedure may be supported that result in a more reliable connection, more efficient use of available resources, more reliable service and operation, reduced latency and system latency, and an improved user experience.

[0064]

[0071] FIG. 6 shows a block diagram 600 of a device 605 that supports transmission on a mixed dynamic frequency selection channel during channel availability checking, according to one or more aspects of the present disclosure. The device 605 can be an example of an aspect of the device 505 or the AP 105 described herein. The device 605 can include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 can also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0065]

[0072] The receiver 610 can provide means for receiving information such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels related to transmission on a mixed dynamic frequency selection channel during channel availability checking). The information can be passed to other components of the device 605. The receiver 610 can utilize a single antenna or a set of multiple antennas.

[0066]

[0073] The transmitter 615 can provide means for transmitting signals generated by other components of the device 605. The transmitter 615 can utilize a single antenna or a set of multiple antennas.

[0067]

[0074] Device 605 or its various components can be an example of means for implementing various aspects of transmission on a mixed dynamic frequency selection channel during channel availability checking as described herein. For example, communication manager 620 can include a channel type manager 625, a CAC manager 630, a beacon manager 635, or any combination thereof. Communication manager 620 can be an example of an aspect of communication manager 520 as described herein. In some examples, communication manager 620, or its various components, can be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using, or otherwise in cooperation with, receiver 610, transmitter 615, or both. For example, communication manager 620 can receive information from receiver 610, transmit information to transmitter 615, or be integrated in combination with receiver 610, transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.

[0068]

[0075] Communication manager 620 can support wireless communication at an access point according to the examples disclosed herein. Channel type manager 625 can be configured as, or otherwise support, means for identifying that a communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type. CAC manager 630 can be configured as, or otherwise support, means for performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels. Beacon manager 635 can be configured as, or otherwise support, means for transmitting one or more beacons locally on at least one of the one or more second channels during a channel availability check procedure.

[0069]

[0076] FIG. 7 shows a block diagram 700 of a communication manager 720 that supports transmission on a mixed dynamic frequency selection channel during a channel availability check, according to one or more aspects of the present disclosure. The communication manager 720 can be an example of the communication manager 520, the communication manager 620, or both, as described herein. The communication manager 720 or its various components can be an example of means for implementing various aspects of transmission on a mixed dynamic frequency selection channel during a channel availability check, as described herein. For example, the communication manager 720 can include a channel type manager 725, a CAC manager 730, a beacon manager 735, a channel availability manager 740, a bitmap manager 750, a low latency network manager 745, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0070]

[0077] The communication manager 720 can support wireless communication at an access point, according to the examples disclosed herein. The channel type manager 725 can be configured as, or support, means for identifying that a communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type. The CAC manager 730 can be configured as, or support, means for performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels. The beacon manager 735 can be configured as, or support, means for transmitting one or more beacons to a station on at least one of the one or more second channels during a channel availability check procedure.

[0071]

[0078] In some examples, one or more first channels of the first dynamic frequency selection type are dynamic frequency selection channels, and one or more second channels of the second dynamic frequency selection type are non-dynamic frequency selection channels.

[0072]

[0079] In some examples, the channel availability manager 740 may be configured as means for updating a bitmap to indicate that one or more first channels are unavailable for transmission during a channel availability check procedure, or may otherwise support it, where transmitting one or more beacons is based on updating the bitmap.

[0073]

[0080] In some examples, the bitmap manager 750 may be configured as means for including a bitmap in one or more beacons transmitted locally during a channel availability check procedure, or may support it in some cases.

[0074]

[0081] In some examples, the channel availability manager 740 may be configured as means for updating a bitmap to indicate that at least one of one or more first channels is available for transmission based on a channel availability check procedure upon completion of the channel availability check procedure, or may otherwise support it. In some examples, the beacon manager 735 may be configured as means for transmitting one or more additional beacons on at least one of one or more second channels and at least one of one or more first channels according to an updated bitmap after completion of the channel availability check procedure, where the updated bitmap is included in one or more additional beacons, or may otherwise support it.

[0075]

[0082] In some examples, the channel availability manager 740 may be configured as, or support, means for updating a bitmap to indicate that at least one of one or more first channels is unavailable for transmission upon completion of a channel availability check procedure. In some examples, the CAC manager 730 may be configured as, or support, means for initiating a second channel availability check procedure to determine whether a radar is being used on one or more additional first channels after completion of the channel availability check procedure. In some examples, the channel availability manager 740 may be configured as, or support, means for updating a bitmap to indicate that at least one of one or more additional first channels is available or unavailable for transmission based on the second channel availability check procedure upon completion of the second channel availability check procedure.

[0076]

[0083] In some examples, the bitmap manager 750 may be configured as, or support, means for transmitting a bitmap in one or more beacon high throughput operation information elements (IEs) to support including the bitmap in one or more beacons.

[0077]

[0084] In some examples, the beacon manager 735 may be configured as, or support, means for including an indication of the duration for which the bitmap is valid along with the bitmap in one or more beacons. In some examples, the duration is indicated in terms of time, transmission time interval, or units of beacons.

[0078]

[0085] In some examples, the low latency network manager 745 can be configured as or support means for determining that a communication band is associated with a low latency network, where updating a bitmap is based on that determination.

[0079]

[0086] In some examples, each bit of the bitmap corresponds to one of one or more first channels or one of one or more second channels. In some examples, the access point includes a telephone. In some examples, the station includes a virtual reality device.

[0080]

[0087] In some examples, the CAC manager 730 can be configured as or support means for monitoring one or more first channels for radar use while simultaneously transmitting one or more beacons during a channel availability check procedure. In some examples, the CAC manager 730 can be configured as or support means for determining whether radar detected on one or more first channels meets an interference threshold amount.

[0081]

[0088] FIG. 8 shows a diagram of a system 800 that includes a device 805 that supports transmission on a hybrid dynamic frequency selection channel during channel availability checking, according to one or more aspects of the present disclosure. The device 805 can be, or can include, an example of a component of the device 505, the device 605, or the AP described herein. The device 805 can include components for two-way voice and data communication, including components for transmitting and receiving communication, such as a communication manager 820, a network communication manager 810, a transceiver 815, an antenna 825, a memory 830, a code 835, a processor 840, and an AP - to - AP communication manager 845. These components may communicate electronically via one or more buses (e.g., bus 850), or otherwise (e.g., operably, communicably, functionally, electronically, electrically) coupled.

[0082]

[0089] The network communication manager 810 can manage communication with a core network (e.g., via one or more wired backhaul links). For example, the network communication manager 810 can manage the transfer of data communication for client devices such as one or more STAs 115.

[0083]

[0090] In some cases, device 805 may include a single antenna 825. However, in some other cases, device 805 may have two or more antennas 825 that may be capable of simultaneously transmitting or receiving multiple wireless transmissions. Transceiver 815 may communicate bi-directionally via one or more of the antennas 825, wired links, or wireless links described herein. For example, transceiver 815 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. Transceiver 815 may also include a modem for modulating packets and providing the modulated packets to one or more antennas 825 for transmission and for demodulating packets received from one or more antennas 825. Transceiver 815, or transceiver 815 and one or more antennas 825, may be an example of a transmitter 515, transmitter 615, receiver 510, receiver 610, or any combination thereof or components thereof described herein.

[0084]

[0091] Memory 830 may include RAM and ROM. Memory 830 may store computer-readable computer-executable code 835 that, when executed by processor 840, causes device 805 to perform various functions described herein. In some cases, memory 830 may include, in particular, BIOS that can control basic hardware operations or software operations, such as interactions with peripheral components or peripheral devices.

[0085]

[0092] Processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, DSP, CPU, microcontroller, ASIC, FPGA, programmable logic device, discrete gate or transistor logic component, discrete hardware component, or any combination thereof). In some cases, processor 840 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause the device 805 to perform various functions (e.g., a function or task of supporting transmission on a mixed dynamic frequency selection channel during channel availability checking). For example, device 805 or a component of device 805 may include processor 840 and memory 830 coupled to or coupled with processor 840, and processor 840 and memory 830 may be configured to perform the various functions described herein.

[0086]

[0093] The inter-station communication manager 845 may manage communication with other APs 105 and may include a controller or scheduler for controlling communication with the STA 115 in cooperation with other APs 105. For example, the inter-station communication manager 845 may adjust scheduling for transmission to the AP 105 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communication manager 845 may provide an X2 interface within the LTE / LTE-A wireless communication network technology to provide communication between the APs 105.

[0087]

[0094] Communication manager 820 may support wireless communication at an access point according to the examples disclosed herein. For example, communication manager 820 may be configured as means for identifying that a communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type, or may support it otherwise. Communication manager 820 may be configured as means for performing a channel availability check procedure to determine whether radar is being used on one of the one or more first channels, or may support it otherwise. During the channel availability check procedure, communication manager 820 may be configured as means for transmitting one or more beacons locally on at least one of the one or more second channels, or may support it otherwise.

[0088]

[0095] By including or configuring a device 805 with a communication manager 820 according to the examples described herein, the device 805 may support techniques for beacon transmission during a CAC procedure that result in a more reliable connection, more efficient use of available resources, more reliable service and operation, reduced delay and system latency, and an improved user experience.

[0089]

[0096] FIG. 9 shows a flowchart illustrating a method 900 for supporting transmission on a mixed dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure. The operations of method 900 may be performed by an AP or a component thereof as described herein. For example, the operations of method 900 may be executed by the AP described with reference to FIGS. 1-8. In some examples, the AP may execute a set of instructions for controlling the functional elements of the AP to perform the described functions. Additionally or alternatively, the AP may use dedicated hardware to perform aspects of the described functions.

[0090]

[0097] At 905, the method may include identifying that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type. The operation of 905 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 905 may be implemented by the channel type manager 725 described with reference to FIG. 7.

[0091]

[0098] At 910, the method may include performing a channel availability check procedure to determine whether the radar is being used on one of the one or more first channels. The operation of 910 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 910 may be implemented by the CAC manager 730 described with reference to FIG. 7.

[0092]

[0099] At 915, the method may include transmitting one or more beacons to the station on at least one of the one or more second channels during the channel availability check procedure. The operation of 915 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 915 may be implemented by the beacon manager 735 described with reference to FIG. 7.

[0093]

[0100] FIG. 10 shows a flowchart of a method 1000 that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check, according to one or more aspects of the present disclosure. The operations of method 1000 may be implemented by an AP or its components as described herein. For example, the operations of method 1000 may be implemented by the AP described with reference to FIGS. 1-8. In some examples, the AP may execute a set of instructions to control the functional elements of the AP to perform the described functions. Additionally or alternatively, the AP may use dedicated hardware to perform aspects of the described functions.

[0094]

[0101] At 1005, the method may include identifying that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type. The operation of 1005 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1005 may be performed by the channel type manager 725 described with reference to FIG. 7.

[0095]

[0102] At 1010, the method may include performing a channel availability check procedure to determine whether the radar is being used on one of the one or more first channels. The operation of 1010 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1010 may be performed by the CAC manager 730 described with reference to FIG. 7.

[0096]

[0103] At 1015, the method may include updating a bitmap to indicate that one or more of the first channels are unavailable for transmission during the channel availability check procedure. The operation of 1015 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1015 may be performed by the channel availability manager 740 described with reference to FIG. 7.

[0097]

[0104] At 1020, the method may include transmitting one or more beacons to the station on at least one of the one or more second channels during the channel availability check procedure, and transmitting the one or more beacons is based on updating the bitmap. The operation of 1020 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1020 may be performed by the beacon manager 735 described with reference to FIG. 7.

[0098]

[0105] Figure 11 shows a flowchart of a method 1100 for supporting transmission on a hybrid dynamic frequency selection channel during channel availability checking according to one or more aspects of the present disclosure. The operations of method 1100 may be performed by an AP or a component thereof, as described herein. For example, the operations of method 1100 may be performed by the AP described with reference to FIGS. 1-8. In some examples, the AP may execute a set of instructions to control the functional elements of the AP to perform the described functions. Additionally or alternatively, the AP may use dedicated hardware to perform aspects of the described functions.

[0099]

[0106] At 1105, the method may include identifying that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type. The operation of 1105 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1105 may be performed by the channel type manager 725 described with reference to FIG. 7.

[0100]

[0107] At 1110, the method may include performing a channel availability check procedure to determine whether radar is being used on one of the one or more first channels. The operation of 1110 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1110 may be performed by the CAC manager 730 described with reference to FIG. 7.

[0101]

[0108] At 1115, the method may include updating a bitmap to indicate that one or more of the first channels are unavailable for transmission during the channel availability check procedure. The operation of 1115 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1115 may be performed by the channel availability manager 740 described with reference to FIG. 7.

[0102]

[0109] At 1120, the method may include transmitting one or more beacons locally on at least one of one or more second channels during a channel availability check procedure, and transmitting the one or more beacons is based on updating a bitmap. The operations of 1120 may be implemented according to the examples disclosed herein. In some examples, aspects of the operations of 1120 may be implemented by the beacon manager 735 described with reference to FIG. 7.

[0103]

[0110] At 1125, the method may include updating a bitmap to indicate that at least one of one or more first channels is available for transmission based on a channel availability check procedure upon completion of the channel availability check procedure. The operations of 1125 may be implemented according to the examples disclosed herein. In some examples, aspects of the operations of 1125 may be implemented by the channel availability manager 740 described with reference to FIG. 7.

[0104]

[0111] At 1130, the method may include transmitting one or more additional beacons on at least one of one or more second channels and at least one of one or more first channels according to the updated bitmap after completion of the channel availability check procedure, and the updated bitmap is included in the one or more additional beacons. The operations of 1130 may be implemented according to the examples disclosed herein. In some examples, aspects of the operations of 1130 may be implemented by the beacon manager 735 described with reference to FIG. 7.

[0105]

[0112] Note that the methods described herein are for illustrative possible implementations, that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Further, aspects in two or more of the above methods may be combined.

[0106]

[0113] The following provides an overview of aspects of the present disclosure.

[0107]

[0114] Aspect 1: A method for wireless communication at an access point, comprising identifying that a communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type, performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels, and transmitting one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0108]

[0115] Aspect 2: The method according to Aspect 1, wherein the one or more first channels of the first dynamic frequency selection type are dynamic frequency selection channels and the one or more second channels of the second dynamic frequency selection type are non-dynamic frequency selection channels.

[0109]

[0116] Aspect 3: The method according to Aspect 1 or 2, further comprising updating a bitmap to indicate that one or more of the first channels are unavailable for transmission during the channel availability check procedure, wherein transmitting the one or more beacons is at least partially based on updating the bitmap.

[0110]

[0117] Aspect 4: The method according to Aspect 3, further comprising including a bitmap in the one or more beacons transmitted to a station during the channel availability check procedure.

[0111]

[0118] Aspect 5: Updating a bitmap to indicate that at least one of one or more first channels is available for transmission, at least partially based on the channel availability check procedure, upon completion of the channel availability check procedure; and, after completion of the channel availability check procedure, transmitting one or more additional beacons on at least one of one or more second channels and at least one of one or more first channels according to the updated bitmap, wherein the updated bitmap is included in the one or more additional beacons, the method according to aspect 3 or 4, further comprising.

[0112]

[0119] Aspect 6: Updating a bitmap to indicate that at least one of one or more first channels is unavailable for transmission, at least partially based on the channel availability check procedure, upon completion of the channel availability check procedure; and, after completion of the channel availability check procedure, starting a second channel availability check procedure to determine whether a radar is being used on one or more additional first channels; and, upon completion of the second channel availability check procedure, updating a bitmap to indicate that at least one of one or more additional first channels is available or unavailable for transmission, at least partially based on the second channel availability check procedure, the method according to any one of aspects 3 to 5, further comprising.

[0113]

[0120] Aspect 7: Including a bitmap in one or more beacons further comprises transmitting the bitmap in the very high throughput operation information element (IE) of the one or more beacons, the method according to any one of aspects 3 to 6.

[0114]

[0121] Aspect 8: Further comprising including, in one or more beacons, an indication of the duration for which the bitmap is valid, together with the bitmap, the method according to any one of aspects 3 to 7.

[0115]

[0122] Aspect 9: The method according to aspect 8, wherein the duration is indicated in terms of time, transmission time interval, or unit of beacon.

[0116]

[0123] Aspect 10: The method according to any one of aspects 3 to 9, further comprising determining that the communication band is associated with a low-latency network, and updating the bitmap is at least partially based on that determination.

[0117]

[0124] Aspect 11: The method according to any one of aspects 3 to 10, wherein each bit of the bitmap corresponds to one of one or more first channels or one of one or more second channels.

[0118]

[0125] Aspect 12: The method according to any one of aspects 1 to 11, wherein the access point includes a telephone and the station includes a virtual reality device.

[0119]

[0126] Aspect 13: The method according to any one of aspects 1 to 12, further comprising monitoring one or more first channels for radar use during a channel availability check procedure while simultaneously transmitting one or more beacons, and determining whether the radar detected on one or more first channels meets an interference threshold amount.

[0120]

[0127] Aspect 14: An apparatus for wireless communication at an access point, comprising a processor, a memory coupled to the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to execute the method according to any one of aspects 1 to 13.

[0121]

[0128] Aspect 15: An apparatus for wireless communication at an access point, comprising at least one means for executing the method according to any one of aspects 1 to 13.

[0122]

[0129] Aspect 16: A non-transitory computer-readable medium storing code for wireless communication at an access point, the code including instructions executable by a processor to perform the method according to any one of Aspects 1 to 13.

[0123]

[0130] The techniques described herein may be used in a variety of wireless communication systems such as code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and other systems. The terms "system" and "network" are often used interchangeably. A code division multiple access (CDMA) system may implement wireless technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers the IS-2000 standard, IS-95 standard, and IS-856 standard. The IS-2000 release may generally be referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is generally referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A time division multiple access (TDMA) system may implement wireless technologies such as the Global System for Mobile Communications (GSM), etc. An orthogonal frequency division multiple access (OFDMA) system may implement wireless technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc.

[0124]

[0131] One or more wireless communication systems described herein may support synchronous or asynchronous operation. In the case of synchronous operation, base stations may have similar frame timings, and transmissions from different base stations may be approximately aligned in time. In the case of asynchronous operation, stations may have different frame timings, and transmissions from different stations may not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operation.

[0125]

[0132] The downlink transmissions described herein may also be referred to as forward link transmissions, and the uplink transmissions may also be referred to as reverse link transmissions. For example, each communication link described herein, including the WLAN 100, wireless communication system 200, and wireless communication system 201 of FIGS. 1, 2, and 3, may include one or more carriers, and each carrier may be a signal composed of a plurality of subcarriers (e.g., waveform signals of various frequencies).

[0126]

[0133] The descriptions provided herein with respect to the accompanying drawings illustrate exemplary configurations and do not necessarily represent all examples that may be implemented or fall within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration" and does not mean "preferred" or "advantageous over other examples." The detailed description includes specific details to facilitate understanding of the techniques described. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the examples being described.

[0127]

[0134] In the accompanying drawings, like components or features may have the same reference label. Further, various components of the same type may be distinguished by attaching a dash and a second label, after the reference label, that distinguishes similar components. Where only a first reference label is used herein, the description is applicable to any one of the similar components having the same first reference label, regardless of the second reference label.

[0128]

[0135] The information and signals described herein may be represented using any of a variety of techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0129]

[0136] The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gates or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in association with a DSP core, or any other such configuration).

[0130]

[0137] The functions described in this specification may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. The features implementing the functions may also be physically located in various places, including being distributed such that parts of the functions are executed at different physical locations. Also, as used herein within the scope of the claims, "or" as used within a listing of items (e.g., a listing of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive listing such that, for example, a listing of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, the phrase "based on" as used herein should not be construed as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, when used herein, the phrase "based on" shall be construed in the same manner as the phrase "at least partially based on".

[0131]

[0138] A computer-readable medium includes both non-transitory computer storage media and communication media that facilitate transfer of a computer program from one location to another. The non-transitory storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can comprise RAM, ROM, electrically erasable programmable read-only memory (EEPROM), compact disk read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory media that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general purpose or special purpose computer or a general purpose or special purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of media. As used herein, disk and disc include CD, laser disk, optical disk, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disk typically magnetically reproduces data and disc optically reproduces data with a laser. Combinations of the above are also included within the scope of computer-readable media.

[0132]

[0139] The description in this specification is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Accordingly, the present disclosure is not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at an access point, comprising: identifying that a communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type; performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels; transmitting one or more beacons locally on at least one of the one or more second channels during the channel availability check procedure; A method comprising the steps of:

2. The method according to claim 1, wherein the one or more first channels of the first dynamic frequency selection type are dynamic frequency selection channels, and the one or more second channels of the second dynamic frequency selection type are non-dynamic frequency selection channels.

3. Updating a bitmap to indicate that one or more of the first channels are unavailable for transmission during the channel availability check procedure, wherein transmitting the one or more beacons is at least partially based on updating the bitmap; The method according to claim 1, further comprising:

4. Including the bitmap in the one or more beacons transmitted to the local station during the channel availability check procedure; The method according to claim 3, further comprising:

5. Updating the bitmap to indicate that at least one of the one or more first channels is available for transmission at least partially based on the channel availability check procedure upon completion of the channel availability check procedure; After completion of the channel availability check procedure, transmitting one or more additional beacons on at least one of the one or more second channels and at least one of the one or more first channels according to the updated bitmap, wherein the updated bitmap is included in the one or more additional beacons; The method according to claim 3, further comprising:

6. When the channel availability check procedure is completed, updating the bitmap to indicate that at least one of the one or more first channels is unavailable for transmission based at least in part on the channel availability check procedure; After the completion of the channel availability check procedure, starting a second channel availability check procedure to determine whether the radar is being used on one or more additional first channels; When the second channel availability check procedure is completed, updating the bitmap to indicate that at least one of the one or more additional first channels is available or unavailable for transmission based at least in part on the second channel availability check procedure; The method according to claim 3, further comprising.

7. including the bitmap in the one or more beacons; transmitting the bitmap in the very high throughput operation information element (IE) of the one or more beacons; The method according to claim 3, further comprising.

8. including, in the one or more beacons, an indication of the duration for which the bitmap is valid, together with the bitmap; The method according to claim 3, further comprising.

9. The method according to claim 8, wherein the duration is indicated in terms of time, transmission time interval, or units of beacons.

10. determining that the communication band is associated with a low latency network, wherein updating the bitmap is based at least in part on the determination; The method according to claim 3, further comprising.

11. The method according to claim 3, wherein each bit of the bitmap corresponds to one of the one or more first channels or one of the one or more second channels.

12. the access point includes a telephone; the station includes a virtual reality device; The method according to claim 1.

13. monitoring the one or more first channels for radar use during the channel availability check procedure while simultaneously transmitting the one or more beacons; determining whether the radar detected on the one or more first channels meets an interference threshold amount; The method according to claim 1, further comprising

14. An apparatus for wireless communication at an access point, comprising: a processor; a memory coupled to the processor; stored in the memory, causing the apparatus to identify that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type; perform a channel availability check procedure to determine whether radar is being used on one of the one or more first channels; during the channel availability check procedure, transmit one or more beacons locally on at least one of the one or more second channels; instructions executable by the processor to An apparatus comprising

15. The apparatus according to claim 14, wherein the one or more first channels of the first dynamic frequency selection type are dynamic frequency selection channels, and the one or more second channels of the second dynamic frequency selection type are non-dynamic frequency selection channels.

16. The instructions further causing the apparatus to be executable by the processor to update a bitmap to indicate that one or more of the first channels are unavailable for transmission during the channel availability check procedure, and the instructions further causing the apparatus to transmit the one or more beacons based at least in part on updating the bitmap. The apparatus according to claim 14.

17. The instructions further causing the apparatus to include the bitmap in the one or more beacons transmitted to the station during the channel availability check procedure. The apparatus according to claim 16, which is further executable by the processor to

18. The instructions further causing the apparatus to update the bitmap to indicate that at least one of the one or more first channels is available for transmission based at least in part on the channel availability check procedure upon completion of the channel availability check procedure. After completion of the channel availability check procedure, cause one or more additional beacons to be transmitted on at least one of the one or more second channels and at least one of the one or more first channels according to the updated bitmap, wherein the updated bitmap is included in the one or more additional beacons, The apparatus according to claim 16, further executable by the processor as described above.

19. The instructions cause the apparatus to At the time of completion of the channel availability check procedure, update the bitmap to indicate that at least one of the one or more first channels is unavailable for transmission based at least in part on the channel availability check procedure, After completion of the channel availability check procedure, initiate a second channel availability check procedure to determine whether radar is being used on one or more additional first channels, At the time of completion of the second channel availability check procedure, update the bitmap to indicate that at least one of the one or more additional first channels is available or unavailable for transmission based at least in part on the second channel availability check procedure, The apparatus according to claim 16, further executable by the processor as described above.

20. The instructions for including the bitmap in the one or more beacons cause the apparatus to Transmit the bitmap in the very high throughput operation information element (IE) of the one or more beacons, The apparatus according to claim 16, further executable by the processor as described above.

21. The instructions cause the apparatus to Include, in the one or more beacons, an indication of the duration for which the bitmap is valid, together with the bitmap, The apparatus according to claim 16, further executable by the processor as described above.

22. The apparatus according to claim 21, wherein the duration is indicated in terms of time, transmission time interval, or units of beacons.

23. The instructions cause the apparatus to Determine that the communication band is associated with a low latency network, and updating the bitmap is based at least in part on the determination, The apparatus according to claim 16, which is further executable by the processor as described above.

24. Each bit of the bitmap corresponds to one of the one or more first channels or one of the one or more second channels. The apparatus according to claim 16.

25. The access point includes a telephone. The station includes a virtual reality device. The apparatus according to claim 14.

26. The instructions cause the apparatus to Monitor the one or more first channels for radar use during the channel availability check procedure while simultaneously transmitting the one or more beacons. Determine whether the radar detected on the one or more first channels meets an interference threshold amount. The apparatus according to claim 14, which is further executable by the processor as described above.

27. An apparatus for wireless communication at an access point, comprising: Means for identifying that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type; Means for performing a channel availability check procedure to determine whether radar is being used on one of the one or more first channels; Means for transmitting one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure. An apparatus comprising the above.

28. The apparatus according to claim 27, wherein the one or more first channels of the first dynamic frequency selection type are dynamic frequency selection channels, and the one or more second channels of the second dynamic frequency selection type are non-dynamic frequency selection channels.

29. The apparatus according to claim 27, further comprising means for updating a bitmap to indicate that the one or more first channels are unavailable for transmission during the channel availability check procedure, and the means for transmitting the one or more beacons transmits the one or more beacons based at least in part on updating the bitmap. The apparatus according to claim 27, further comprising the above.

30. Means for including the bitmap in the one or more beacons transmitted to the station during the channel availability check procedure. The apparatus according to claim 29, further comprising the same. **Claim 31** Means for updating the bitmap to indicate that at least one of the one or more first channels is available for transmission, at least partially based on the channel availability check procedure, upon completion of the channel availability check procedure. Means for transmitting one or more additional beacons on at least one of the one or more second channels and at least one of the one or more first channels according to the updated bitmap after completion of the channel availability check procedure, wherein the updated bitmap is included in the one or more additional beacons. The apparatus according to claim 29, further comprising the same. **Claim 32** Means for updating the bitmap to indicate that at least one of the one or more first channels is unavailable for transmission, at least partially based on the channel availability check procedure, upon completion of the channel availability check procedure. Means for starting a second channel availability check procedure to determine whether radar is being used on one or more additional first channels after completion of the channel availability check procedure. Means for updating the bitmap to indicate that at least one of the one or more additional first channels is available or unavailable for transmission, at least partially based on the second channel availability check procedure, upon completion of the second channel availability check procedure. The apparatus according to claim 29, further comprising the same. **Claim 33** The means for including the bitmap in the one or more beacons Means for transmitting the bitmap in the very high throughput operation information element (IE) of the one or more beacons. The apparatus according to claim 29, further comprising the same. **Claim 34** Means for further including an indication of the duration for which the bitmap is valid, together with the bitmap, in the one or more beacons. The apparatus according to claim 29, further comprising the same.

35. The apparatus according to claim 34, wherein the duration is indicated in terms of time, transmission time interval, or unit of beacon.

36. Means for determining that the communication band is associated with a low-latency network, wherein updating the bitmap is at least partially based on the determination. The apparatus according to claim 29, further comprising the means.

37. Each bit of the bitmap corresponds to one of the one or more first channels or one of the one or more second channels. The apparatus according to claim 29.

38. The access point includes a telephone. The station includes a virtual reality device. The apparatus according to claim 27.

39. Means for monitoring the one or more first channels for radar use during the channel availability check procedure while simultaneously transmitting the one or more beacons. Means for determining whether the radar detected on the one or more first channels meets an interference threshold amount. The apparatus according to claim 27, further comprising the means.

40. A non-transitory computer-readable medium storing code for wireless communication at an access point, the code being identifying that the communication band includes one or more first channels of a first dynamic frequency selection type and one or more second channels of a second dynamic frequency selection type, performing a channel availability check procedure to determine whether radar is being used on one of the one or more first channels, transmitting one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure. A non-transitory computer-readable medium including instructions executable by a processor.

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