Transmission on hybrid dynamic frequency selection channel during channel availability check

Abstract

Methods, systems, and devices for wireless communication are described. An access point (AP) may update bitmaps (e.g., very high throughput (EHT) operation (Ops) information element (IE) disabled sub-channel bitmaps) that indicate which channels of a frequency band are available and 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., rather than performing any beacon transmission after waiting to the CAC).

Description

[0001] Cross-references

[0002] This patent application claims the benefit of Indian Patent Application No. 202241032748, filed by Dutta et al. on June 8, 2022, titled “TRANSMISSIONS ON MIXED DYNAMIC FREQUENCYSELECTION CHANNELSDURING CHANNEL AVAILABILITY CHECK,” which is assigned to the assignee of this application. Background Art

[0003] The following relates to wireless communications including transmissions on a hybrid dynamic frequency selection channel during a channel availability check.

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems may be multiple access systems that can support 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) such as Wi-Fi (i.e., Institute of Electrical and Electronics Engineers (IEEE) 802.11) network, may include an access point (AP) that can communicate with one or more stations (STAs) or mobile devices. An AP may be coupled to a network such as the Internet, and may enable mobile devices to communicate via the network (or communicate with other devices coupled to the access point). A wireless device may communicate bidirectionally with a network device. For example, in a WLAN, a STA may communicate with an associated AP via downlink (DL) and uplink (UL) communications. A DL (or forward link) may refer to a communication link from an AP to a station, and a UL (or reverse link) may refer to a communication link from a station to an AP. Summary of the invention

[0005] The described technology relates to improved methods, systems, devices, or apparatuses that support transmission on hybrid dynamic frequency selection (DFS) channels during a channel availability check. In general, an access point (AP) may update a bitmap indicating which channels of a frequency band are available and unavailable (e.g., a sub-channel bitmap disabled by an extremely high throughput (EHT) operation (Ops) information element (IE)). 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 a CAC, the AP may send a beacon to one or more stations (STAs) on an available non-DFS channel (e.g., instead of waiting until after the CAC to perform any beacon transmissions).

[0006] 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 sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0007] 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 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; perform a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels; and send one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0008] Another apparatus for wireless communication at an access point is described. The apparatus may include: 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; 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 sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0009] 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 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; perform a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels; and send one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, one or more first channels of a first dynamic frequency selection type may be dynamic frequency selective channels, and one or more second channels of a second dynamic frequency selection type may be non-dynamic frequency selective channels.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for updating a bitmap during a channel availability check procedure to indicate that one or more first channels may not be available for transmission, wherein transmitting the one or more beacons may be based on updating the bitmap.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for including a bitmap in one or more beacons sent to a station during a channel availability check procedure.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: when a channel availability check procedure expires, updating a bitmap based on the channel availability check procedure to indicate that at least one first channel of one or more first channels may be available for transmission; and after the channel availability check procedure expires, sending one or more additional beacons on at least one second channel of one or more second channels and at least one first channel of one or more first channels according to the updated bitmap, wherein the updated bitmap may be included in the one or more additional beacons.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: when a channel availability check procedure expires, updating a bitmap based on the channel availability check procedure to indicate that at least one of the one or more first channels may not be available for transmission; after the channel availability check procedure expires, initiating a second channel availability check procedure to determine whether radar may be in use on one or more additional first channels; and when the second channel availability check procedure expires, updating the bitmap based on the second channel availability check procedure to indicate that at least one of the one or more additional first channels may be available or unavailable for transmission.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, including a bitmap in one or more beacons may include operations, features, components, or instructions for sending the bitmap in a very high throughput operation information element (IE) of the one or more beacons.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include a method for communicating with a Figure 1 The operation, feature, component, or instruction of including an indication of a duration for which a bitmap may be valid in one or more beacons.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the duration may be indicated in units of time, transmission time intervals, or beacons.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that a communication band may be associated with a low-latency network, wherein updating the bitmap may be based on the determination.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each bit of the bitmap corresponds to a first channel of the one or more first channels or a second channel of the one or more second channels.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the access point includes a phone and the station includes a virtual reality device.

[0021] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, 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 the one or more first channels meets a threshold amount of interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An example of a wireless communication system supporting transmissions on a hybrid dynamic frequency selection channel during a channel availability check in accordance with aspects of the present disclosure is illustrated.

[0023] Figure 2A and Figure 2B An example of a wireless communication system supporting transmission on a hybrid dynamic frequency selection channel during a channel availability check in accordance with one or more aspects of the present disclosure is illustrated.

[0024] Figure 3 An example of a timeline supporting transmission on a hybrid dynamic frequency selection channel during a channel availability check in accordance with one or more aspects of the present disclosure is illustrated.

[0025] Figure 4 An example of a process flow to support transmission on a hybrid dynamic frequency selection channel during a channel availability check in accordance with one or more aspects of the present disclosure is illustrated.

[0026] Figure 5 and Figure 6 A block diagram of a device supporting transmission on a hybrid dynamic frequency selection channel during a channel availability check is shown in accordance with one or more aspects of the present disclosure.

[0027] Figure 7 A block diagram of a communication manager supporting transmissions on a hybrid dynamic frequency selection channel during a channel availability check is shown in accordance with one or more aspects of the present disclosure.

[0028] Figure 8 A diagram of a system including a device that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check is shown in accordance with one or more aspects of the present disclosure.

[0029] Figures 9 to 11 A flow chart illustrating a method of supporting transmission on a hybrid dynamic frequency selection channel during a channel availability check in accordance with one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0030] In some examples, an access point (AP) may operate in a 5 GHz band. In some examples, an AP may operate in a low-latency network and may communicate on one or more dynamic frequency selection (DFS) channels. For example, on a 160 MHz channel, an 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 a mandatory channel availability check (CAC) before beacon transmission. During CAC, the AP may monitor radar (e.g., on a DFS channel). While monitoring radar, the AP may suppress transmission, and therefore may not send any beacons during CAC. CAC may last for several seconds or minutes. During this time period, one or more stations (STA) may not be able to establish a connection with the AP or maintain a connection with the AP, resulting in failed communications, failure to establish a connection, interrupted services, one or more failed operations, and a poor user experience.

[0031] As described herein, an AP may update a bitmap (e.g., an extremely high throughput (EHT) operation (Ops) information element (IE)) that indicates which channels of a frequency band are available and unavailable. In some examples, the AP may update the bitmap during CAC based on whether various channels are DFS channels or non-DFS channels. During CAC, the AP may send beacons to one or more STAs on available non-DFS channels (e.g., instead of waiting until after CAC to perform any beacon transmission). This may allow the AP to continue beacon transmission during the CAC procedure instead of being unavailable to the STA. Such techniques may then support low-latency communications and avoid unnecessary delays in services (e.g., for virtual reality (VR) devices or other low-latency operations, etc.). Upon expiration of the CAC, the AP may update the bitmap to indicate that all channels are available (e.g., if the CAC is successful on the DFS channels), and may beacon transmission on all channels. If the CAC is unsuccessful on one or more DFS channels, the STA may update the bitmap to indicate an unavailable DFS channel, and may initiate a second CAC to identify an available DFS or other channel. In some examples, the AP may send (eg, in a beacon sent during CAC) an indication of the updated bitmap, an indication of the duration for which the bitmap is valid, or both.

[0032] Aspects of the disclosure are first described in the context of a wireless communication system. Aspects of the disclosure are further illustrated and described with reference to wireless communication systems, timelines, and process flows. Aspects of the disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to transmissions on a hybrid dynamic frequency selection channel during a channel availability check.

[0033] Figure 1 A wireless local area network (WLAN) 100 (also referred to as a Wi-Fi network) configured according to various aspects of the present disclosure is illustrated. The WLAN 100 may include an AP 105 and a plurality of associated STAs 115, which 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 associated STAs 115 may represent a basic service set (BSS) or an extended service set (ESS). The various STAs 115 in the network are able to communicate with each other through the AP 105. Also shown is a coverage area 110 of the AP 105, which may represent a basic service area (BSA) of the WLAN 100. An extended network station (not shown) associated with the WLAN 100 may be connected to a wired or wireless distribution system that may allow multiple APs 105 to be connected in an ESS.

[0034] In some examples, the AP 105 may update a bitmap (e.g., an EHT Ops IE) indicating which channels of the frequency band are available and unavailable. In some examples, the AP 105 may update the bitmap based on whether various channels are DFS channels or non-DFS channels during CAC. During CAC, the AP 105 may send beacons to one or more STAs 115 on available non-DFS channels (e.g., instead of waiting until after CAC to perform any beacon transmission). This may allow the AP 105 to continue beacon transmission during the CAC procedure, rather than being unavailable to the STA 115. Such techniques may then support low-latency communications and avoid unnecessary delays in services (e.g., for virtual reality (VR) devices or other low-latency operations, etc.). When the CAC expires, the AP 105 may update the bitmap to indicate that all channels are available (e.g., if the CAC is successful on the DFS channel), and beacon transmission may be performed on all channels.

[0035] Although not in Figure 1 105 , but a STA 115 may be located at the intersection of more than one coverage area 110 and may be associated with more than one AP 105. A single AP 105 and a set of associated STAs 115 may be referred to as a BSS. An ESS is a collection of connected BSSs. A distribution system (not shown) may be used to connect the APs 105 in 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., urban areas, home networks, etc.) with different and overlapping coverage areas 110. Two STAs 115 may also communicate directly via a direct wireless link 125, regardless of whether the two STAs 115 are in the same coverage area 110. Examples of direct wireless links 120 may include Wi-Fi direct connections, Wi-Fi tunneling direct link setup (TDLS) links, and other group connections. The STA 115 and the AP 105 may communicate according to WLAN radio and baseband protocols for the physical layer and the medium access control (MAC) layer from 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. In other specific implementations, peer-to-peer connections or ad hoc networks may be implemented within the WLAN 100.

[0036] In some cases, a STA 115 (or AP 105) may be detected by the central AP 105, but may not be detected by other STAs 115 in 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, the two STAs 115 may communicate with the AP 105, but may not receive each other's transmissions. This may cause transmission conflicts between the two STAs 115 in a contention-based environment (e.g., carrier sense multiple access with collision avoidance (CSMA / CA)) because the STAs 115 may not refrain from transmitting over each other. STAs 115 whose transmissions cannot be identified but are within the same coverage area 110 may be referred to as hidden nodes. CSMA / CA can be supplemented by the exchange of request to send (RTS) packets sent by the sender STA 115 (or AP 105) and clear to send (CTS) packets sent by the receiver STA 115 (or AP 105). This can alert other devices within the range of the transmitter and receiver not to transmit during the duration of the main transmission. Thus, RTS / CTS can help alleviate the hidden node problem.

[0037] Figure 2A An example of a wireless communication system 200 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 illustrated. The wireless communication system 200 may include an AP 105-a and a STA 115-a, which may be a reference Figure 1 Examples of corresponding devices described. In some examples, the AP 105-a may serve one or more STAs 115-a within the coverage area 110-a.

[0038] AP 105-a may send (e.g., periodically) one or more beacons 215. Beacons 215 may enable any STA 115 within the wireless range of AP 105-a to establish or maintain a communication link with the WLAN. Beacons 215 may send capability information of one or more BSSs managed by AP 105-a. Therefore, if AP 105-a refrains from sending beacons 215 for a period of time, STA 115-a may not be able to establish or maintain a connection with AP 105-a, which may result in failed communications, retransmissions of wireless communications, delays and increased latency at STA 115-a, and a reduced user experience. For example, AP 105-a and STA 115-a may support virtual reality operations (e.g., AP 105-a may be a portable device, a gaming system, a smart device, a smart phone, user equipment, etc.). If AP 105 - a does not transmit beacon 215 , virtual reality operations may cease or otherwise fail due to the lack of beacon 215 from AP 105 - a .

[0039] In some examples, the AP 105-a may operate in one or more frequency bands (e.g., the 5 GHz band). Radar transmissions may also be performed via one or more channels of the 5 GHz band. In some examples, the STA 115-a may support a dynamic frequency selection (DFS) procedure to facilitate communications on the 5 GHz band without experiencing interference or interruptions due to radar transmissions. The AP 105-a may communicate with one or more STAs 115-a via one or more channels or sub-channels of various types. The AP 105-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). The DFS channels may support a spectrum sharing mechanism that allows WLAN devices operating in the 5 GHz band to coexist with radar systems operating in the same band.

[0040] The DFS procedure may provide for the AP 105-a to perform a channel availability check (CAC) 210 to search for radar pulses in a frequency channel in which the AP 105-a is operating or during an automatic channel scan. During the CAC 210, the AP 105-a may refrain from transmitting beacons 215 and may instead monitor for radar signals. If the AP 105-a does not encounter any radar during the CAC 210 (e.g., during a CAC time point period), the AP 105-a may perform transmission and reception (e.g., including transmission of beacons 215) on one or more channels monitored during the CAC 210 when the CAC 210 expires. If the AP 105-a detects a radar signal in a current operating channel (e.g., a 20 MHz channel in the 5 GHz band) during the CAC 210, the AP 105-a may interrupt operations on the channel for a period of time (e.g., thirty minutes). The AP 105 - a may then select a new channel and may repeat the DFS procedure (eg, initiating a second CAC 210 on the new channel) until an available channel is identified (eg, where no radar is encountered).

[0041] The CAC 210 may take a defined (e.g., standardized) time period (e.g., thirty seconds, one minute, thirty minutes, etc.). The AP 105-a may not perform any transmissions or receptions to the BSS during the CAC 210, which may affect network traffic during the time frame of the CAC 210. If the AP 105-a refrains from transmitting the beacon 215 during the entire CAC 210, one or more communications or operations between the AP 105-a and the STA 115-a may fail (e.g., the STA 115-a may not be able to find and establish a connection with the AP 105-a, or may not be able to maintain communications with the AP 105-a). For example, in a low-latency network (e.g., supporting STA 115-a, where STA 115-a is a VR device, AR device, extended reality (XR) device, etc., and AP 105-a is a soft AP such as a phone), if the STA-AP must wait for a beacon for the entire CAC procedure duration, time may be wasted, the connection may fail, operations may be suspended, etc., resulting in a poor user experience.

[0042] In some examples, AP 105-a may be configured to operate according to EHT (Extremely High Throughput) mode on one or more channels (e.g., in the 5 GHz band). In such examples, AP 105-a may identify (e.g., generate or be configured with) a list of DFS channels and non-DFS channels. AP 105-a may identify or indicate which channels are to be used or which channels are not to be used according to a bitmap (e.g., EHT Ops IE, which may be referred to as a disabled 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 that a subchannel is disabled or enabled or available within a fixed time period until otherwise indicated, etc. The bitmap may indicate an available or unavailable channel, subchannel, frequency band, or portion of a frequency band, bandwidth, or any combination thereof. Although described herein with respect to an indication of a channel or subchannel, the described bitmap (e.g., a disabled subchannel bitmap) may be implemented according to the described techniques to enable or disable any subdivision of frequency resources (e.g., channels, subchannels, frequency bands, bandwidths, etc.). In some examples, Ap 105-a may communicate using channels indicated as available according to the bitmap (e.g., with one or more STA 115) and may refrain from communicating using channels indicated as unavailable according to the bitmap (e.g., with one or more STA 115).

[0043] According to the techniques described herein, the AP 105-a may mark the DFS channels as unavailable or not used during the CAC 210 (e.g., a bitmap may be updated to indicate that the DFS channels of the 5 GHz band are unavailable). In such examples, the AP 105-a may refrain from transmitting or receiving on the unavailable DFS channels during the CAC 210 (e.g., from transmitting beacons 215). However, the AP 105-a may transmit beacons 215 on available non-DFS channels during the CAC 210 (e.g., according to the updated bitmap). The AP 105-a may continue to transmit beacons on non-DFS channels (e.g., at a lower bandwidth) during the CAC duration. For example, the AP 105-a may refrain from transmitting on a DFS channel (e.g., a 20 MHz channel on the 5 GHz band), but may continue to transmit beacons on a non-DFS channel (e.g., a 20 MHz channel on a different frequency band).

[0044] When the CAC 210 expires, the AP 105-a may update a bitmap (e.g., a disabled subchannel bitmap) in the EHT ops to indicate full bandwidth support (e.g., if the AP 105-a did not encounter any radars on the DFS channels during the CAC 210). In some examples (e.g., in terms of in-service radar monitoring), the AP 105-a may encounter radars on one or more DFS channels during the CAC 210. In such examples, the STA 115-a may update a bitmap (e.g., a disabled subchannel bitmap) to silence channels (e.g., 20 MHz channels or subchannels) affected by the radar (e.g., marking as unavailable). Based on the bitmap, the AP 105-a may initiate another CAC 210 and may refrain from beaconing on unavailable channels or subchannels, but may continue to beacon on available channels or subchannels. That is, the AP 105 - a may mute the 20 MHz subchannels affected by the radar, but may serve the remaining available channels (eg, non-DFS 20 MHz subchannels) while performing CSA or CAC 210 on the DFS subchannels.

[0045] By implementing the techniques described herein, the AP 105-a and the STA 115-a may continue to support connections and various operations during the CAC 210 (e.g., during a timeout period associated with the CAC 210). Continued transmissions (e.g., beacons 215, data, or other transmission types) on available channels (e.g., non-DFS channels) during the CAC 210 may support continued and uninterrupted communications between the AP 105-a and the STA 115-a, improved communications, and more efficient use of available resources, may avoid interruptions to operations (e.g., including low-latency communications, virtual reality (VR) or augmented reality (AR) operations), etc.

[0046] Figure 2B An example of a wireless communication system 201 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 illustrated. The wireless communication system 201 may include an AP 105-b and a STA 115-b, which may be a reference Figure 1 and Figure 2A Examples of corresponding devices described.

[0047] In some examples, UE 115-b (e.g., a smart phone) may act as a soft AP. In such examples, UE 115-b may perform low-latency communication with device 220 (e.g., a VR or AR device, such as VR glasses). Device 220 may be connected to UE 115-b via a soft AP link, and UE 115-b may be connected to the WLAN via WLAN AP 105-b. In such examples, as described herein, UE 115-b (e.g., acting as a soft AP) may send one or more beacons (e.g., beacon 215) to device 220. As described in reference Figure 2A , Figure 3 and Figure 4 As described, UE 115-b may perform beacon transmission during CAC. For example, UE 115-b may mark a DFS channel as unavailable or not used during CAC 210 (e.g., a bitmap may be updated to indicate that a DFS channel in the 5 GHz band is unavailable). In such an example, UE 115-b may refrain from transmitting or receiving on an unavailable DFS channel during CAC 210 (e.g., from transmitting beacon 215). However, UE 115-b may transmit beacon 215 on an available non-DFS channel during CAC 210 (e.g., according to the updated bitmap). UE 115-b may continue to transmit beacons on non-DFS channels (e.g., at a lower bandwidth) during the CAC duration.

[0048] Upon expiration of the CAC 210, the UE 115-b may update a bitmap (e.g., a disabled subchannel bitmap) in the EHT ops to indicate full bandwidth support (e.g., if the UE 115-b did not encounter any radars on the DFS channels during the CAC 210). In some examples (e.g., in terms of in-service radar monitoring), the UE 115-b may encounter radars on one or more DFS channels during the CAC 210. In such examples, the UE 115-b may update a bitmap (e.g., a disabled subchannel bitmap) to silence (e.g., mark as unavailable) channels (e.g., 20 MHz channels or subchannels) affected by the radar. Based on the bitmap, the UE 115-b may initiate another CAC 210 and may refrain from beaconing on unavailable channels or subchannels, but may continue to beacon on available channels or subchannels. That is, UE 115 - b may mute the 20 MHz subchannel affected by the radar, but may serve the remaining available channels (eg, non-DFS 20 MHz subchannels) while performing CSA or CAC 210 on the DFS subchannels.

[0049] By implementing the techniques described herein, the UE 115-b and the device 220 may continue to support connectivity and various operations during the CAC 210 (e.g., during a timeout period associated with the CAC 210). Continued transmissions (e.g., beacons 215, data, or other transmission types) on available channels (e.g., non-DFS channels) during the CAC 210 may support continued and uninterrupted communications between the UE 115-b and the device 220, improved communications, and more efficient use of available resources, may avoid interruptions to operations (e.g., including low-latency communications, VR or AR operations), etc. Reference Figure 3 and Figure 4 The techniques described involving APs and UEs may similarly be performed by UE 115 - b (eg, acting in soft AP mode) and device 220 .

[0050] Figure 3 An example of a timeline 300 for supporting transmission on a hybrid dynamic frequency selection channel during a channel availability check according to one or more aspects of the present disclosure is illustrated. The timeline 300 may implement or be implemented by aspects of the WLAN 100 and the wireless communication system 200 and the wireless communication system 201. For example, an AP (e.g., AP 105-a) and a STA (e.g., STA 115-a) may implement the timeline 300 and may perform reference Figure 1 2 . In some examples, such APs and STAs may communicate with each other (e.g., may support operations, including VR or AR operations) according to the techniques described herein. In some examples, AP 105-a may be a phone and STA 115-c may be a VR device (e.g., a headset, a wearable device, goggles, a controller, etc.).

[0051] The AP may send one or more beacons 305 to support connection establishment and maintenance, as shown in FIG. Figure 2A and Figure 2B 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 when initiating CAC 310 or during CAC 310), the AP may update a bitmap (e.g., a disabled subchannel bitmap). For example, at time T0, the AP may update the bitmap to indicate one or more DFS channels as unavailable.

[0052] During CAC 310, the AP may transmit beacons 305 according to the updated bitmap. For example, the AP may transmit a 5 GHz beacon 305 with the bitmap set for all DFS20 MHz subchannels. In such an example, the AP may transmit beacons 305 on non-DFS20 MHz subchannels but may refrain from transmitting beacons 305 on DFS20 MHz subchannels. The AP may monitor the DFS20 MHz subchannels for radar while transmitting beacons 305 on non-DFS20 MHz subchannels.

[0053] When the CAC 310 expires, the AP may update the bitmap. For example, at time T1, the AP may determine whether it detects any radar on a monitored unavailable channel (e.g., a DFS 20 MHz subchannel). For example, the AP may determine whether any detected energy meets one or more thresholds. The AP may then update the bitmap accordingly. For example, if no radar is detected on one or more DFS channels, the AP may update the bitmap to indicate that those DFS channels are available (e.g., the bits of the bitmap may be set to available). For example, if the AP does not detect a radar on a DFS channel, the AP may set the bitmap to indicate full bandwidth support or availability. In some examples, at T1, when the CAC 310 duration is served, the AP may update the bitmap and keep the bitmap unchanged as configured by the AP.

[0054] In some examples, the AP may detect radar on one or more DFS channels during CAC 310. In such examples, the AP may update the bitmap accordingly. For example, the AP may set a bit of the bitmap (e.g., associated with the identified channel in which the radar was detected) to indicate that the channel on which the radar was detected is unavailable. In such examples, the AP may also initiate a second CAC, and may 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 again update the bitmap (e.g., indicating the channels on which the radar was detected as unavailable, and indicating the channels on which the radar was not detected as available).

[0055] Figure 4 An example of a process flow 400 for supporting transmission on a hybrid dynamic frequency selection channel during a channel availability check in accordance with one or more aspects of the present disclosure is illustrated. The process flow 400 may include a STA 115-c and an AP 105-c, which may be reference Figures 1 to 3 Examples of the corresponding devices described.

[0056] At 410, the AP 105-c may initiate CAC (e.g., with a CAC timeout period). In some examples, the AP 105-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 AP 105-c may initiate a CAC procedure to determine whether a radar is being used on one or more of the first channels (e.g., DFS channels).

[0057] In some examples, at 405, the AP 105-c may update a bitmap (e.g., an EHT Ops IE disabled subchannel bitmap). The AP 105-c may update the bitmap to indicate that one or more of the DFS channels are unavailable (e.g., each bit corresponding to the DFS channel may be set to indicate that the DFS channel is unavailable). The AP 105-c may update the bitmap before initiating the CAC procedure at 410 (e.g., to indicate that the indicated channel is unavailable during the CAC timeout period), or may update the bitmap when initiating the CAC procedure or during the CAC timeout period. In some cases, the AP 105-c may determine that one or more conditions are met and may update the bitmap based on the determination. For example, the AP 105-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 examples, the AP 105-a may update the bitmap based on determining that the channel is associated with a low-latency network.

[0058] At 415, the AP 105-c may transmit one or more beacons on at least one of the one or more non-DFS channels (e.g., to the STA 115-c during a CAC timeout period) according to the updated bitmap. The AP 105-c may periodically transmit beacons at 415 (e.g., transmitting a first beacon on a non-DFS channel at 415-a and transmitting a second beacon on a non-DFS channel at 415-b). The AP 105-c may not transmit on any of the DFS channels (e.g., channels indicated as unavailable on the bitmap updated at 405). In some examples, the AP 105-c may monitor the DFS channels for radar use while transmitting one or more beacons during a CAC procedure, and may determine whether a radar detected on the DFS channel satisfies a threshold amount of interference.

[0059] In some examples, the AP 105-c may include an indication of the updated bitmap in one or more of the beacons (e.g., sent at 415 or before initiating the CAC procedure). For example, the AP 105-c may update the bitmap at 405 and may include an indication of the updated bitmap in the beacon. In some examples, the AP 105-a may include the bitmap in the EHT ops IE of the beacon. The AP 105-a may include an indication of the duration for which the bitmap is valid in the beacon (e.g., a fixed amount of time, a number of time intervals, a number of beacons, a number of cycles of periodic beacons, etc.). For example, the AP 105-a may send (e.g., in the beacon or in a separate message) an indication of the duration for which the disabled subchannel bitmap is maintained (e.g., target beacon transmit time (TBTT) information). Such information may allow other devices (e.g., STA 115 or AP 105) to determine channel availability and plan traffic accordingly. For example, the AP 105 - a may signal the remaining time of the DFS channel (eg, a timer, an amount of time, a counter, a number of time slots of a beacon, etc.) Such information may be included in the duration indicator element.

[0060] In such examples, STA 115-c may receive a beacon including an indication of the updated bitmap, and may monitor one or more channels accordingly. For example, STA 115-c may monitor non-DFS channels for beacons (e.g., at 415-a, 415-b, etc.), but may refrain from monitoring beacons on DFS channels (e.g., according to the updated bitmap, for the duration that the bitmap is valid). This may result in more efficient power expenditure at STA 115-c, or more efficient reception of beacons 415, and consistent communication via a reliable connection with AP 105-c.

[0061] At 420, upon expiration of the CAC procedure (e.g., upon expiration of the CAC timeout period), the AP 105-c may update the bitmap based on the CAC procedure. For example, the AP 105-c may not detect any radar on one or more DFS channels during the CAC procedure (e.g., any detected energy may fail to meet a threshold amount of energy). In such examples, at 420, the AP 105-c may update the bitmap to indicate that at least one of the one or more DFS channels is available for transmission based at least in part on the CAC procedure. For example, the AP 105-c may update the bitmap to indicate full bandwidth availability. In such examples, at 425, the AP 105-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, the AP 105-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).

[0062] In some examples, the AP 105-c may detect a radar on one or more of the DFS channels. In such examples, at 420, the AP 105-c may update a bitmap to indicate that one or more of the DFS channels are unavailable when the CAC procedure expires. The AP 105-c may also initiate (e.g., when the CAC procedure expires and when the bitmap is updated) a second CAC procedure to determine whether a radar is being used on one or more additional DFS channels. When the second CAC procedure expires, the AP 105-c may update the bitmap again to indicate whether the additional DFS channels are available for transmission based on the second CAC procedure. In some examples, the AP 105-c may perform continuous or repeated CAC procedures to identify available DFS channels. During each CAC procedure, the AP 105-c may send a beacon on a channel (e.g., a DFS channel or a non-DFS channel or both) indicated as available according to the most recent update of the bitmap.

[0063] Figure 5 A block diagram 500 of a device 505 supporting 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. The device 505 may be an example of aspects of an AP as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communication manager 520. The device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0064] 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 transmissions on hybrid dynamic frequency selection during channel availability checks). The information may be communicated to other components of device 505. Receiver 510 may utilize a single antenna or a collection of multiple antennas.

[0065] Transmitter 515 may provide means for transmitting signals generated by the other components of device 505. Transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0066] The communication manager 520, the receiver 510, the transmitter 515, or various combinations thereof or various components thereof may be examples of means for performing various aspects of transmission over hybrid dynamic frequency selection during a channel availability check as described herein. For example, the communication manager 520, the receiver 510, the transmitter 515, or various combinations thereof or components thereof may support methods for performing one or more of the functions described herein.

[0067] In some examples, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured as or otherwise supports components for performing the functions described herein. In some examples, a processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0068] Additionally or alternatively, in some examples, the communication manager 520, the receiver 510, the 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). If implemented in code executed by a processor, the functionality of the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functionality described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0069] In some examples, communication manager 520 may be configured to perform various operations (e.g., receive, obtain, monitor, output, send) using or otherwise cooperating with receiver 510, transmitter 515, or both. For example, communication manager 520 may receive information from receiver 510, transmit information to transmitter 515, or be integrated with receiver 510, transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.

[0070] The communication manager 520 may support wireless communications at the access point according to examples as disclosed herein. For example, the communication manager 520 may be configured to or otherwise support components 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. The communication manager 520 may be configured to or otherwise support components 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 to or otherwise support components for sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0071] By including or configuring a communication manager 520 according to the examples described herein, the device 505 (e.g., a processor controlling the receiver 510, the transmitter 515, the communication manager 520, or a combination thereof or otherwise coupled thereto) may support techniques for beaconing during CAC procedures, resulting in more reliable connections, more efficient use of available resources, more efficient use of system resources, more reliable services and operations, reduced delays and system latency, and an improved user experience.

[0072] Figure 6 A block diagram 600 of a device 605 supporting 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. The device 605 may be an example of aspects of the device 505 or AP 105 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0073] Receiver 610 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 transmissions on hybrid dynamic frequency selection during channel availability checks). The information may be communicated to other components of device 605. Receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0074] Transmitter 615 may provide means for transmitting signals generated by other components of device 605. Transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0075] Device 605 or its various components may be examples of components for performing various aspects of transmission on a hybrid dynamic frequency selection channel during a channel availability check as described herein. For example, communication manager 620 may include channel type manager 625, CAC manager 630, beacon manager 635, or any combination thereof. Communication manager 620 may be an example of various aspects of communication manager 520 as described herein. In some examples, communication manager 620 or its various components may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 610, transmitter 615, or both. For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or be integrated with receiver 610, transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.

[0076] The communication manager 620 may support wireless communications at an access point according to examples as disclosed herein. The channel type manager 625 may be configured to or otherwise support components 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. The CAC manager 630 may be configured to or otherwise support components 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 635 may be configured to or otherwise support components for sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0077] Figure 7A block diagram 700 of a communication manager 720 that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check is shown in accordance with one or more aspects of the present disclosure. The communication manager 720 may be an example of aspects of the communication manager 520, the communication manager 620, or both as described herein. The communication manager 720 or its various components may be examples of means for performing various aspects of transmission on a hybrid dynamic frequency selection channel during a channel availability check as described herein. For example, the communication manager 720 may 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).

[0078] The communication manager 720 may support wireless communications at an access point according to examples as disclosed herein. The channel type manager 725 may be configured to or otherwise support components 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. The CAC manager 730 may be configured to or otherwise support components 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 may be configured to or otherwise support components for sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0079] In some examples, one or more first channels of the first dynamic frequency selection type are dynamic frequency selective channels, and one or more second channels of the second dynamic frequency selection type are non-dynamic frequency selective channels.

[0080] In some examples, channel availability manager 740 may be configured or otherwise support components for updating a bitmap during a channel availability check procedure to indicate that one or more first channels are unavailable for transmission, wherein transmitting one or more beacons is based on updating the bitmap.

[0081] In some examples, bitmap manager 750 may be configured or otherwise support components for including a bitmap in one or more beacons sent to stations during a channel availability check procedure.

[0082] In some examples, the channel availability manager 740 may be configured to or otherwise support components for updating a bitmap based on a channel availability check procedure to indicate that at least one of the one or more first channels is available for transmission when the channel availability check procedure expires. In some examples, the beacon manager 735 may be configured to or otherwise support components 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 the channel availability check procedure expires, wherein the updated bitmap is included in the one or more additional beacons.

[0083] In some examples, the channel availability manager 740 may be configured to or otherwise support components for updating a bitmap based on a channel availability check procedure when the channel availability check procedure expires to indicate that at least one of the one or more first channels is not available for transmission. In some examples, the CAC manager 730 may be configured to or otherwise support components for initiating a second channel availability check procedure after the channel availability check procedure expires to determine whether radar is being used on one or more additional first channels. In some examples, the channel availability manager 740 may be configured to or otherwise support components for updating a bitmap based on a second channel availability check procedure when the second channel availability check procedure expires to indicate that at least one of the one or more additional first channels is available or not available for transmission.

[0084] In some examples, to support inclusion of a bitmap in one or more beacons, bitmap manager 750 may be configured or otherwise support components for sending the bitmap in a very high throughput operation information element (IE) of the one or more beacons.

[0085] In some examples, beacon manager 735 can be configured to or otherwise support a method for communicating with a bit Figure 1 A component that includes an indication of the duration for which the bitmap is valid in one or more beacons. In some examples, the duration is indicated in units of time, transmission time intervals, or beacons.

[0086] In some examples, low-latency network manager 745 may be configured or otherwise support components for determining that a communication band is associated with a low-latency network, wherein updating the bitmap is based on the determination.

[0087] In some examples, each bit of the bitmap corresponds to a first channel of the one or more first channels or a second channel of the one or more second channels. In some examples, the access point includes a phone. In some examples, the station includes a virtual reality device.

[0088] In some examples, CAC manager 730 can be configured or otherwise support components 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, CAC manager 730 can be configured or otherwise support components for determining whether radar detected on the one or more first channels meets a threshold amount of interference.

[0089] Figure 8 A diagram of a system 800 including a device 805 that supports transmission on a hybrid dynamic frequency selection channel during a channel availability check in accordance with one or more aspects of the present disclosure is shown. The device 805 may be an example of a device 505, a device 605, or an AP as described herein or include components of these devices. The device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, 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 inter-AP communication manager 845. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 850).

[0090] The network communication manager 810 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communication manager 810 may manage the delivery of data communications for client devices such as one or more STAs 115.

[0091] In some cases, the device 805 may include a single antenna 825. However, in some other cases, the device 805 may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 815 may communicate bidirectionally via one or more antennas 825, a wired link, or a wireless link as described herein. For example, the transceiver 815 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 815 may also include a modem to modulate packets and provide the modulated packets to one or more antennas 825 for transmission, and demodulate packets received from one or more antennas 825. The transceiver 815 or the transceiver 815 and the one or more antennas 825 may be examples of transmitters 515, transmitters 615, receivers 510, receivers 610, or any combination thereof or components thereof as described herein.

[0092] The memory 830 may include RAM and ROM. The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed by the processor 840, cause the device 805 to perform various functions described herein. In some cases, the memory 830 may also contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0093] The processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the 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 the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks that support transmission on a hybrid dynamic frequency selection channel during a channel availability check). For example, the device 805 or a component of the device 805 may include a processor 840 and a memory 830 coupled to or coupled to the processor 840, the processor 840 and the memory 830 being configured to perform the various functions described herein.

[0094] The inter-station communication manager 845 may manage communications with other APs 105 and may include a controller or scheduler for controlling communications with STAs 115 in cooperation with other APs 105. For example, the inter-station communication manager 845 may coordinate scheduling of transmissions to the APs 105 for various interference mitigation techniques such as beamforming or joint transmissions. In some examples, the inter-station communication manager 845 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between APs 105.

[0095] The communication manager 820 may support wireless communications at an access point according to examples as disclosed herein. For example, the communication manager 820 may be configured to or otherwise support components 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. The communication manager 820 may be configured to or otherwise support components 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 820 may be configured to or otherwise support components for sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0096] By including or configuring a communications manager 820 according to examples as described herein, the device 805 may support techniques for beaconing during CAC procedures, resulting in more reliable connections, more efficient use of available resources, more reliable services and operations, reduced delays and system latency, and an improved user experience.

[0097] Fig. 9 A flow chart illustrating a method 900 for supporting 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. The operations of the method 900 may be implemented by an AP or a component thereof as described herein. For example, the operations of the method 900 may be implemented by an AP or a component thereof as described in reference to Figures 1 to 8 The AP performs the described functions. In some examples, the AP may execute instruction sets to control the functional elements of the AP to perform the described functions. Additionally or alternatively, the AP may use dedicated hardware to perform various aspects of the described functions.

[0098] 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 operations of 905 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 905 may be performed as described in reference to Figure 7 The channel type manager 725 is used to execute.

[0099] At 910, the method may include performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels. The operations of 910 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 910 may be performed as described in reference to Figure 7 The CAC manager 730 is used to execute.

[0100] At 915, the method may include sending 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 operations of 915 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 915 may be described with reference to Figure 7 The beacon manager 735 is used to execute.

[0101] Fig.10 A flow chart illustrating a method 1000 for supporting 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. The operations of the method 1000 may be implemented by an AP or components thereof as described herein. For example, the operations of the method 1000 may be implemented by an AP or components thereof as described in reference to Figures 1 to 8The AP performs the described functions. In some examples, the AP may execute instruction sets to control the functional elements of the AP to perform the described functions. Additionally or alternatively, the AP may use dedicated hardware to perform various aspects of the described functions.

[0102] 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 operations of 1005 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1005 may be performed as described in reference to Figure 7 The channel type manager 725 is used to execute.

[0103] At 1010, the method may include performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels. The operations of 1010 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1010 may be performed as described in reference to Figure 7 The CAC manager 730 is used to execute.

[0104] At 1015, the method may include updating a bitmap during a channel availability check procedure to indicate that one or more first channels are not available for transmission. The operations of 1015 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1015 may be performed as described in reference to Figure 7 The channel availability manager 740 is used to execute.

[0105] At 1020, the method may include sending one or more beacons to the station on at least one of the one or more second channels during a channel availability check procedure, wherein sending the one or more beacons is based on updating the bitmap. The operations of 1020 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1020 may be described with reference to Figure 7 The beacon manager 735 is used to execute.

[0106] Fig.11 A flow chart illustrating a method 1100 for supporting 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. The operations of the method 1100 may be implemented by an AP or components thereof as described herein. For example, the operations of the method 1100 may be implemented by an AP or components thereof as described in reference to Figures 1 to 8 The AP performs the described functions. In some examples, the AP may execute instruction sets to control the functional elements of the AP to perform the described functions. Additionally or alternatively, the AP may use dedicated hardware to perform various aspects of the described functions.

[0107] 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 operations of 1105 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1105 may be performed as described in reference to Figure 7 The channel type manager 725 is used to execute.

[0108] At 1110, the method may include performing a channel availability check procedure to determine whether a radar is being used on one of the one or more first channels. The operations of 1110 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1110 may be performed as described in reference to Figure 7 The CAC manager 730 is used to execute.

[0109] At 1115, the method may include updating a bitmap during a channel availability check procedure to indicate that one or more first channels are unavailable for transmission. The operations of 1115 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1115 may be performed as described in reference to Figure 7 The channel availability manager 740 is used to execute.

[0110] At 1120, the method may include sending one or more beacons to the station on at least one of the one or more second channels during the channel availability check procedure, wherein sending the one or more beacons is based on updating the bitmap. The operations of 1120 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1120 may be described with reference to Figure 7 The beacon manager 735 is used to execute.

[0111] At 1125, the method may include updating the bitmap to indicate that at least one of the one or more first channels is available for transmission based on the channel availability check procedure when the channel availability check procedure expires. The operations of 1125 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1125 may be described in reference to Figure 7 The channel availability manager 740 is used to execute.

[0112] At 1130, the method may include, after the channel availability check procedure expires, sending 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 operations of 1130 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1130 may be described with reference to Figure 7The beacon manager 735 is used to execute.

[0113] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and that other implementations are possible. In addition, aspects from two or more methods may be combined.

[0114] The following provides an overview of various aspects of the disclosure:

[0115] Aspect 1: A method for wireless communication at an access point, comprising: identifying a communication band including 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 sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

[0116] 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.

[0117] Aspect 3: The method according to any one of Aspects 1 to 2 further includes: updating a bitmap during the channel availability check procedure to indicate that the one or more first channels are not available for transmission, wherein sending the one or more beacons is at least partially based on updating the bitmap.

[0118] Aspect 4: The method according to aspect 3, further comprising: including the bitmap in the one or more beacons sent to the station during the channel availability check procedure.

[0119] Aspect 5: The method according to any one of Aspects 3 to 4 further includes: when the channel availability check procedure expires, updating the bitmap at least partially based on the channel availability check procedure to indicate that at least one of the one or more first channels is available for transmission; and after the channel availability check procedure expires, sending 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.

[0120] Aspect 6: The method according to any one of Aspects 3 to 5 further includes: when the channel availability check procedure expires, updating the bitmap at least partially based on the channel availability check procedure to indicate that at least one of the one or more first channels is not available for transmission; after the channel availability check procedure expires, initiating a second channel availability check procedure to determine whether radar is being used on one or more additional first channels; and when the second channel availability check procedure expires, updating the bitmap at least partially based on the second channel availability check procedure to indicate that at least one of the one or more additional first channels is available or not available for transmission.

[0121] Aspect 7: The method according to any one of aspects 3 to 6, wherein including the bitmap in the one or more beacons further comprises: sending the bitmap in a very high throughput operation information element (IE) of the one or more beacons.

[0122] Aspect 8: The method according to any one of aspects 3 to 7 further includes: Figure 1 An indication of a duration for which the bitmap will be valid from this time on is included in the one or more beacons.

[0123] Aspect 9: The method according to aspect 8, wherein the duration is indicated in units of time, transmission time interval or beacon.

[0124] Aspect 10: The method according to any one of aspects 3 to 9 further comprises: determining that the communication frequency band is associated with a low-latency network, wherein updating the bitmap is based at least in part on the determination.

[0125] Aspect 11: The method according to any one of aspects 3 to 10, wherein each bit of the bitmap corresponds to a first channel among the one or more first channels or a second channel among the one or more second channels.

[0126] Aspect 12: The method according to any one of aspects 1 to 11, wherein the access point comprises a phone; and the station comprises a virtual reality device.

[0127] Aspect 13: The method according to any one of Aspects 1 to 12 further includes: monitoring the one or more first channels for radar use while simultaneously sending the one or more beacons during the channel availability check procedure; and determining whether the radar detected on the one or more first channels meets a threshold amount of interference.

[0128] 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 perform a method according to any one of Aspects 1 to 13.

[0129] Aspect 15: An apparatus for wireless communication at an access point, comprising at least one component for performing the method according to any one of aspects 1 to 13.

[0130] Aspect 16: A non-transitory computer-readable medium storing code for wireless communication at an access point, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 13.

[0131] The technology described herein can be used for various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. The terms "system" and "network" are often used interchangeably. Code division multiple access (CDMA) systems can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Speed ​​Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. Time division multiple access (TDMA) systems can implement radio technologies such as Global System for Mobile Communications (GSM). An Orthogonal Frequency Division Multiple Access (OFDMA) system may implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and others.

[0132] One or more wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, each station may have similar frame timing, and transmissions from different stations may be approximately aligned in time. For asynchronous operation, each station may have different frame timing, and transmissions from different stations may not be aligned in time. The techniques described herein may be used for synchronous operation or asynchronous operation.

[0133] Downlink transmissions described herein may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions. Each communication link described herein—including, for example, Figure 1 , WLAN 100, wireless communication system 200, and wireless communication system 201 of FIGS. 2 and 3 may include one or more carriers, wherein each carrier may be a signal composed of multiple subcarriers (eg, waveform signals of different frequencies).

[0134] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." The specific implementation includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, in order to avoid obscuring the concepts of the described examples, well-known structures and devices are shown in block diagram form.

[0135] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between the similar components. If only the first reference label is used in the specification, the description applies to any one of the similar components having the same first reference label, regardless of the second reference label.

[0136] The information and signals described herein may be represented using any of a variety of different technologies and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0137] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate 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 an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also 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 conjunction with a DSP core, or any other such configuration).

[0138] The functions described herein 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 as one or more instructions or codes on a computer-readable medium, or sent on a computer-readable medium. Other examples and specific 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, hard wiring, or any combination of these items. The features that implement the functions may also be physically located at different locations, including being distributed so that the parts of the functions are implemented at different physical locations. In addition, as used herein (including in the claims), the "or" used in the enumeration of items (e.g., enumeration of items with phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, so that, for example, the enumeration 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, without departing from the scope of the present disclosure, an exemplary step described as "based on condition A" may be based on both condition A and condition B. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0139] Computer-readable media include both non-transient computer storage media and communication media, including any medium that facilitates the transfer of computer programs from one place to another.Non-transient storage media can be any available medium that can be accessed by a general or special-purpose computer.By way of example and not limitation, non-transient computer-readable media may include RAM, ROM, electrically erasable programmable read-only memory (EEPROM), compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other non-transient medium that can be used to carry or store the desired program code means in the form of instructions or data structures and can be accessed by a general or special-purpose computer or a general or special-purpose processor.In addition, any connection is appropriately referred to as computer-readable media.For example, if software is sent from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, then the coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0140] The description herein is provided to enable one of ordinary skill in the art to implement or use the disclosure. Various modifications to the disclosure will be 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 disclosure. Therefore, the disclosure is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at an access point, comprising: identifying that the communication frequency 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; as well as One or more beacons are sent to a station on at least one of the one or more second channels during the channel availability check procedure.

2. The method of 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. The method according to claim 1, further comprising: A bitmap is updated during the channel availability check procedure to indicate that the one or more first channels are not available for transmission, wherein transmitting the one or more beacons is based at least in part on updating the bitmap.

4. The method according to claim 3, further comprising: The bitmap is included in the one or more beacons sent to the station during the channel availability check procedure.

5. The method according to claim 3, further comprising: upon expiration of the channel availability check procedure, updating the bitmap based at least in part on the channel availability check procedure to indicate that at least one first channel of the one or more first channels is available for transmission; as well as After the channel availability check procedure expires, one or more additional beacons are sent on at least one second channel among the one or more second channels and at least one first channel among the one or more first channels according to the updated bitmap, wherein the updated bitmap is included in the one or more additional beacons.

6. The method according to claim 3, further comprising: upon expiration of the channel availability check procedure, updating the bitmap based at least in part on the channel availability check procedure to indicate that at least one of the one or more first channels is unavailable for transmission; After expiration of the channel availability check procedure, initiating a second channel availability check procedure to determine whether radar is being used on one or more additional first channels; as well as Upon expiration of the second channel availability check procedure, the bitmap is updated based at least in part on the second channel availability check procedure to indicate that at least one of the one or more additional first channels is available or unavailable for transmission.

7. The method of claim 3, wherein including the bitmap in the one or more beacons further comprises: The bitmap is sent in a very high throughput operation information element (IE) of the one or more beacons.

8. The method according to claim 3, further comprising: An indication of a duration for which the bitmap is valid is included in the one or more beacons along with the bitmap.

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

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

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

12. The method of claim 1, wherein: The access point comprises a telephone; and The station includes virtual reality equipment.

13. The method according to claim 1, further comprising: monitoring the one or more first channels for radar use during the channel availability check procedure while simultaneously transmitting the one or more beacons; as well as A determination is made as to whether radar detected on the one or more first channels satisfies a threshold amount of interference.

14. An apparatus for wireless communication at an access point, comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: identifying that the communication frequency 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; as well as One or more beacons are sent to a station on at least one of the one or more second channels during the channel availability check procedure.

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

16. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: updating a bitmap during the channel availability check procedure to indicate that the one or more first channels are not available for transmission, wherein in order to transmit the one or more beacons, the instructions are further executable by the processor to cause the apparatus to transmit the one or more beacons based at least in part on updating the bitmap.

17. The apparatus of claim 16, wherein the instructions are further executable by the processor to cause the apparatus to: The bitmap is included in the one or more beacons sent to the station during the channel availability check procedure.

18. The apparatus of claim 16, wherein the instructions are further executable by the processor to cause the apparatus to: upon expiration of the channel availability check procedure, updating the bitmap based at least in part on the channel availability check procedure to indicate that at least one of the one or more first channels is available for transmission; and After the channel availability check procedure expires, one or more additional beacons are sent on at least one second channel among the one or more second channels and at least one first channel among the one or more first channels according to the updated bitmap, wherein the updated bitmap is included in the one or more additional beacons.

19. The apparatus of claim 16, wherein the instructions are further executable by the processor to cause the apparatus to: upon expiration of the channel availability check procedure, updating the bitmap based at least in part on the channel availability check procedure to indicate that at least one of the one or more first channels is unavailable for transmission; After expiration of the channel availability check procedure, initiating a second channel availability check procedure to determine whether radar is being used on one or more additional first channels; as well as Upon expiration of the second channel availability check procedure, the bitmap is updated based at least in part on the second channel availability check procedure to indicate that at least one of the one or more additional first channels is available or unavailable for transmission.

20. The apparatus of claim 16, wherein the instructions for including the bitmap in the one or more beacons are further executable by the processor to cause the apparatus to: The bitmap is sent in a very high throughput operation information element (IE) of the one or more beacons.

21. The apparatus of claim 16, wherein the instructions are further executable by the processor to cause the apparatus to: An indication of a duration for which the bitmap is valid is included in the one or more beacons along with the bitmap.

22. The apparatus of claim 21, wherein: The duration is indicated in units of time, transmission time interval or beacon.

23. The apparatus of claim 16, wherein the instructions are further executable by the processor to cause the apparatus to: A determination is made that the communications band is associated with a low latency network, wherein updating the bitmap is based at least in part on the determination.

24. The apparatus of claim 16, wherein: Each bit of the bitmap corresponds to a first channel of the one or more first channels or a second channel of the one or more second channels.

25. The apparatus of claim 14, wherein: The access point comprises a telephone; and The station includes virtual reality equipment.

26. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: monitoring the one or more first channels for radar use during the channel availability check procedure while simultaneously transmitting the one or more beacons; and A determination is made as to whether radar detected on the one or more first channels satisfies a threshold amount of interference.

27. An apparatus for wireless communication at an access point, comprising: means for identifying that the communications 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; and Means for sending one or more beacons to a station on at least one of the one or more second channels during the channel availability check procedure.

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

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

30. The apparatus of claim 29, further comprising: Means for including the bitmap in the one or more beacons sent to the station during the channel availability check procedure.

31. The apparatus of claim 29, further comprising: means for updating 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 when the channel availability check procedure expires; and A component for sending 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 the channel availability check procedure expires, wherein the updated bitmap is included in the one or more additional beacons.

32. The apparatus of claim 29, further comprising: means for 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 when the channel availability check procedure expires; means for initiating a second channel availability check procedure to determine whether radar is being used on one or more additional first channels after expiration of the channel availability check procedure; and 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 based at least in part on the second channel availability check procedure when the second channel availability check procedure expires.

33. The apparatus of claim 29, wherein the means for including the bitmap in the one or more beacons further comprises: Means for transmitting the bitmap in a very high throughput operation information element (IE) of the one or more beacons.

34. The apparatus of claim 29, further comprising: Means for including, with the bitmap, in the one or more beacons an indication of a duration for which the bitmap is valid.

35. The apparatus of claim 34, wherein: The duration is indicated in units of time, transmission time interval or beacon.

36. The apparatus of claim 29, further comprising: Means for determining that the communications band is associated with a low latency network, wherein updating the bitmap is based at least in part on the determination.

37. The apparatus of claim 29, wherein: Each bit of the bitmap corresponds to a first channel of the one or more first channels or a second channel of the one or more second channels.

38. The apparatus of claim 27, wherein: The access point comprises a telephone; and The station includes virtual reality equipment.

39. The apparatus of claim 27, further comprising: means for monitoring said one or more first channels for radar use while simultaneously transmitting said one or more beacons during said channel availability check procedure; and Means for determining whether radar detected on the one or more first channels satisfies a threshold amount of interference.

40. A non-transitory computer readable medium storing code for wireless communication at an access point, the code comprising instructions executable by a processor to: identifying that the communication frequency 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; as well as One or more beacons are sent to a station on at least one of the one or more second channels during the channel availability check procedure.

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