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JP-7855004-B2 - Communication device for reducing WLAN sensing overhead

JP7855004B2JP 7855004 B2JP7855004 B2JP 7855004B2JP-7855004-B2

Inventors

  • プシュカルナ ラジャット
  • チトラカール ロジャン
  • シム ホン チェン マイケル
  • ディン イェンイー
  • 浦部 嘉夫

Assignees

  • パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ

Dates

Publication Date
20260507
Application Date
20220304
Priority Date
20210409

Claims (8)

  1. During operation, the system includes a transceiver that receives signals via a wireless local area network (WLAN), During operation, a circuit demodulates and decodes the aforementioned signal, A communication device equipped with, The decoded signal includes a notification from the associated communication device that a threshold has been exceeded for WLAN sensing . The circuit, when operating , generates a request frame requesting feedback from the associated communication device based on the notification of exceeding the threshold, and transmits the request frame to the associated communication device. Communication device.
  2. The circuit, upon operation, initiates a WLAN sensing procedure to perform a full-channel measurement based on a notification of exceeding the threshold. The communication device according to claim 1.
  3. The aforementioned request frame is a sensing request frame that includes a WLAN sensing request, The circuit starts the WLAN sensing procedure by generating the sensing request frame during operation. The transmitting/receiving unit transmits the sensing request frame to the associated communication device. The communication device according to claim 2 .
  4. The circuit performs the full-channel measurement when in operation. The communication device according to claim 2 .
  5. The circuit, when operating, performs a full channel measurement and generates an NDP for transmission to the associated communication device in order to provide explicit channel measurement feedback based on the requested feedback, including explicit feedback. The communication device according to claim 1 .
  6. The circuit, during operation, further generates staggered PPDUs for transmission to the associated communication device in order to provide the explicit channel measurement feedback. The communication device according to claim 5 .
  7. The decoded signal includes channel quality information of the LTF (long training field) contained in the PPDU received by the associated communication device, based on the requested feedback, including partial feedback. The communication device according to claim 1 .
  8. An integrated circuit for controlling a communication device, The process of receiving signals on a wireless local area network (WLAN), Control the process of demodulating and decoding the aforementioned signal, The decoded signal includes a notification from the associated communication device that a threshold has been exceeded for WLAN sensing. Based on the notification of exceeding the threshold, the system controls the process of generating a request frame requesting feedback from the associated communication device and transmitting the request frame to the associated communication device. Integrated circuit.

Description

This disclosure generally relates to wireless local area network (WLAN) communications, and more particularly to communication devices for reducing WLAN sensing overhead. In modern society, communication devices are widespread in the form of telephones, tablets, computers, cameras, digital audio/video players, wearable devices, game consoles, telehealth and telemedicine devices, vehicles with communication capabilities, and various combinations of the above. Communication includes, for example, data communication through wireless local area network (WLAN) systems, cellular systems, satellite systems, and various combinations thereof. WLAN sensing applications typically perform channel measurements to track one or more wireless links over time and classify channel variations as events/activities. Channel State Information (CSI) is sometimes used in WLAN sensing because it provides information describing how wireless signals propagate within a channel, including various effects such as time delay, amplitude attenuation, and phase shift on each subcarrier. In WLAN communication, the CSI is calculated based on the LTF (long training field) in the PHY (physical layer) header. The difference between the transmitted LTF and the received LTF lies in the channel state information. The receiver estimates the CSI matrix using a predefined signal and the received signal after receiving processing such as cyclic prefix removal, demapping, and OFDM demodulation. According to current WLAN specifications, channel measurement is performed using the LTF (Least Footprint) of NDP (null data packet). Consider a scenario where sensing needs to be performed 10 times per beacon interval. Sounding can take up to approximately 1 millisecond during the beacon interval. Depending on the WLAN sensing application, very frequent channel measurements may be required, significantly increasing the number of soundings. Based on WLAN sensing use cases, a sensing overhead of up to 10 percent is expected in many scenarios. In a single initiator and single responder scenario, if channel measurements are performed more than 10 times per beacon interval, the sensing overhead could exceed 10 percent. With multiple initiators and multiple responders, the network overhead for sensing can increase significantly. Therefore, in order to reduce the overhead of sounding, there is a need for communication devices and communication methods for reducing the overhead of WLAN sensing by minimizing the use of sounding for WLAN sensing and associated frame exchange, thereby mitigating the aforementioned problems. Furthermore, other desirable features and characteristics will become apparent from the following detailed description and the attached claims, in conjunction with the attached drawings and their background. The non-limiting and exemplary embodiments of this disclosure contribute to providing several mechanisms and methods that can minimize the use of sounding for wireless local area network (WLAN) sensing and associated frame exchange in order to reduce sounding overhead. In one embodiment, the technology disclosed herein features a communication device having a transmitting/receiving unit and a circuit. The transmitting/receiving unit receives a signal from a WLAN during operation. The circuit demodulates and decodes the signal during operation, and the decoded signal includes a first PPDU (physical layer protocol data unit) and a second PPDU. The circuit performs a full channel measurement during operation based on the first PHY (physical layer) header of the first PPDU and the second PHY header of the second PPDU, and the first and second PHY headers include a long training field (LTF) for estimating channel quality. These comprehensive or specific embodiments may be implemented as systems, methods, integrated circuits, computer programs, or recording media, or as any combination of systems, devices, methods, integrated circuits, computer programs, and recording media. Further advantages and effects of one embodiment of this disclosure will be revealed in the specification and drawings. Such advantages and/or effects are provided by several embodiments and features described in the specification and drawings, but not all of them are necessarily provided to obtain one or more identical features. In the following, exemplary embodiments will be described in more detail with reference to the attached drawings. This diagram shows an example of a wireless local area network (WLAN) system and the communication equipment in operation. Figures 2A and 2B show block diagrams of an example of a communication device. Figure 2A shows an example of a wireless station (STA) communication device, and Figure 2B shows a wireless access point (AP). This figure shows an example of conventional WLAN sensing during communication between an access point (AP) and a wireless station (STA) in a WLAN system. This figure shows a conventional threshold-based feedback mechanism f