93 results about "Quiet period" patented technology

The present invention provides a system and a method for improving the wireless local area network (WLAN) throughput performance in a collocated WLAN / Bluetooth system that uses packet traffic arbitration (PTA) to schedule WLAN and Bluetooth transmissions. The method includes detecting a Bluetooth transmission, where the Bluetooth transmission comprises one or more quiet periods; and scheduling a WLAN transmission, where frames of the WLAN transmission are received during the quiet periods of the Bluetooth transmission. The method according to the present invention allows the collocated WLAN to receive a frame send by the access point (AP) and acknowledge its reception without the AP reducing the data transmission rate due to unacknowledged frames.; Also, the present invention discloses a mechanism where a collocated Bluetooth device (BTD) and WLAN device can communicate to the AP through a single antenna.

A periodic quiet interval is provided for base stations attempting to access a shared transmission medium in NR-U. The base station activates a quiet interval at a periodic interval and transmits on the medium based on the quiet interval. The base station may reduce a Tx power, not transmit, and/or may increase a minimum value of a contention window for BEB during the quiet interval. The base station may receive a request from a second base station to activate the quiet interval, and may determine if a Tx power of the base station is larger than the maximum Tx power of the second base station. The base station may also receive the request as relayed through a UE. The quiet interval can thus ameliorate a starvation effect of BEB in NR-U by allowing base stations with smaller Tx power greater opportunity to control the medium while maintaining BEB in NR-U.

The invention discloses a method, a device and a data frame for sensing spectrum. The method for sensing spectrum includes ensuring configuration information of a spectrum sensing protection interval used to avoid a protection time GP from being interfered. The spectrum sensing protection interval is used to avoid the spectrum sensing being interfered from the signal transmission and the configuration information aims at indicating the location of the spectrum sensing protection interval in the protection time. A quiet period is set in the protection time based on the configuration information of the spectrum sensing protection interval and, in the quiet period, the spectrum sensing is performed. The method guarantees the compatibility with the present agreement through reusing the protection time in data frame and setting quiet time in the protection time. Further, through setting the spectrum sensing protection interval which includes a front protection interval and/or a back protection interval, the method effectively avoids the interference of signal transmission to spectrum sensing and the spectrum sensing can be performed without affecting the signal transmission.

A method of recovering timing information in a packet network, involves detecting quiet periods in the packet network when network packet delay variation (PDV) is low. A frequency prediction unit is trained during the quiet periods to learn output clock variations of a timing recovery unit to permit the frequency prediction unit to predict frequency update values for a local oscillator during non quiet periods taking into account the historical output clock variations during quiet periods. The output of the frequency prediction unit is used as the active frequency update values during non quiet periods.

A method of maintaining signal convergence of a transmitter and a receiver of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, by generating synchronized comfort noise frame in the transmitter and in the receiver during quiet periods and mutually updating the receiver's decoder and encoder on their states.

The invention relates to a UW-CSMA/CA based node quieting method for hydroacoustic network communication. The method comprises the steps: in a hydroacoustic network, a neighbor node A surrounding a source node or destination node of a certain communication process monitors frames sent by other nodes in the hydroacoustic network, the quiet period of the node A is set to be max{Qlocal, QUIET_RTS} if xRTS is monitored, the quiet period of the node A is set to be max{Qlocal, QUIET_CTS} if xCTS is monitored, monitored xDATA is matched with current quiet period if the xDATA is monitored, the quiet period is reset to be QUIET_DATA if the xDATA is matched with the current quiet period, the quiet period is set to be max{Qlocal, QUIET_ DATA } if the xDATA is not matched with the current quiet period, xACK is matched with the current quiet period if the xACK is monitored, quieting is ended immediately if the xACK is matched with the current quiet period, and the quiet period is kept invariable if the xACK is not matched with the current quiet period.

The invention provides a cognitive radio system capable of realizing spectrum sensing without a quiet period, which is applied to cognitive radio networks. The system comprises a cognitive radio transmitting set and a cognitive radio receiving set, wherein the cognitive radio transmitting set is used for transmitting information by using chaotic signals; and the cognitive radio receiving set is used for simultaneously carrying out spectrum sensing and chaotic signal demodulation on the received signals. By using the system, a cognitive radio user does not need to use the quiet period when spectrum sensing is carried out, thereby increasing the time for the cognitive radio user to carry out data transmission, ensuring the continuity of data transmission and enhancing the communication QoS (Quality of Service) of the cognitive wireless user.

A method and system for scheduling and protecting quiet periods (QP) in a quiet zone (105) for incumbent signal (121) detection in a wireless communications system. The communication system includes a plurality of wireless networks (103, 104), each of the plurality of wireless networks contains at least a master device (101, 401 ) and a client device (111, 411). In each of the plurality of wireless networks, the master device (101, 401) transmits a beacon (402) that contains a QP schedule (500) and a reservation of a time slot (405) for the client device (411 ). The client device (111, 411) transmits a request-to-quiet (RTQ) message (412) during the time slot, wherein the RTQ message (412) includes the client device's QP schedule information. The master and client devices within the quiet zone (105) keep quiet during scheduled quiet periods according to the QP schedule information contained in the received beacons and RTQ messages.

A singular spectrum analysis-based ionized layer anomaly detection method provided by the present invention comprises the steps of obtaining the historical ionized layer observation data ION; utilizing a singular spectrum analysis method to obtain an ionized layer normal variation component IONmain; calculating the normal background noise epsilon based on an ionized layer quiet period; according to the ionized layer normal variation component IONmain and the normal background noise epsilon, obtaining a normal variation range of the ionized layer observation data ION; when the actual ionized layer observation data exceeds the normal variation range of the ionized layer observation data ION, representing that an ionized layer is abnormal. According to the present invention, by the singular spectrum analysis, a periodic signal can be identified and reinforced, the extracted normal variation component contains the influences, such as the season change of the ionized layer along with the revolution of the earth, the 9-day, 13.5-day and 27-day periodic variation of the ionized layer caused by a sun 27-day rotation period, etc., so that the interferences caused by different external environments of the earth at a background field time period and the anomaly detection time period are removed from an anomaly detection result, and the ionized layer anomaly information can be detected effectively.