15 results about "Short Interframe Space" patented technology

A multi-access point coordination signal transmission method includes receiving a coordination control frame transmitted from a first access point (AP) by a second AP, decoding and parsing the coordination control frame by the second AP during a short interframe space, transmitting a leading signal from a second AP to a second station when a first packet protocol data unit (PPDU) is transmitted from the first AP to a first station, entering an idle state by the second station after the leading signal is completely received, and receiving a second PPDU transmitted from the second AP by the second station after leaving the idle state

A first station (STA) receives, from a second STA, a block acknowledgement request (BAR) frame: soliciting a block acknowledgement (BA) frame from the first STA, initiating a transmit opportunity (TXOP), and indicating whether the first STA is required to perform a carrier sense (CS) operation during a short inter frame space (SIFS) duration after receiving the BAR frame. Based on the BAR frame indicating that the first STA is required to perform the CS operation, the first STA performs the CS operation during the SIFS duration after receiving the BAR frame. Based on a result of the CS operation indicating idle, the first STA transmits, to the second STA and in response to the BAR frame, the BA frame.

The present disclosure provides methods, components, devices, and systems for acknowledgement (ACK) processing associated with media access control (MAC) header verification, payload verification, or both. Some aspects are more particularly directed to a first wireless device announcing processing capabilities associated with performing MAC protocol data unit (MPDU) authentication, including MAC header authentication, payload authentication, or both. In some implementations, the processing capability may include a processing latency for performing authentication, a threshold number of MPDUs supporting authentication within a short inter-frame spacing (SIFS) time interval, or both. The first wireless device may send an indication of processing capability to the second wireless device. In some implementations, the second wireless device may transmit the MPDU to the first wireless device according to the processing capability. Additionally or alternatively, the first wireless device may transmit an ACK frame for the MPDU according to the processing capability.

This disclosure provides methods, components, devices and systems for overlapping physical layer protocol data unit (PPDU) end point offset. Some aspects more specifically relate to staggering the end times of overlapping PPDUs transmitted by multiple access points (APs) such that the corresponding block acknowledgments (BAs) are staggered by durations exceeding BA locking periods for the APs. In some examples, a BA may be transmitted by a wireless station (STA) to an AP a short interframe space (SIFS) after the end time of a PPDU transmitted by the AP. When multiple APs transmit concurrent PPDUs, multiple STAs may accordingly transmit corresponding BAs. By implementing techniques to stagger the BAs, an AP that locks onto a BA and determines that the BA is intended for another AP can receive a next staggered BA intended for the AP.

The present disclosure describes examples of the mechanism of a Supplemental Beacon. The Supplemental Beacon may be used as an additional beacon to an original main beacon in a Wi-Fi system. The Supplemental Beacon may be transmitted in a Short Interframe Space (SIFS) interval preceding the transmittance of the main beacon. Establishing set times of the Supplemental Beacon transmittance before the main beacon may allow client devices to wake up at consistent time intervals to receive data, and allow client devices to only remain awake for a short duration between the Supplemental Beacon transmittance and the main beacon transmittance before going back to sleep. The support of a Supplemental Beacon to the main beacon at fixed times of short duration before the main beacon that may allow the conservation of power of client devices and network devices in the Wi-Fi system, and increase productivity in the transmission of data.

The invention relates to a wireless transceiver, a transmission rate control method thereof and a wireless communication system. The wireless transceiver comprises a communication module and a processing unit. The communication module is used for transmitting and receiving radio frequency signals. The processing unit is coupled to the communication module and configured to perform the following operations: upon detecting an overlapping basic service set packet, determine whether an active spatial reuse transmission is required; when it is judged that active spatial reuse transmission needs to be carried out, entering a rollback stage; when the target is detected to be the data packet of the wireless transceiver before the end of the fallback stage, pausing the fallback stage and receiving the data packet; determining the smaller one of the minimum transmission power of the response frame for responding to the data packet and the active transmission power of the corresponding wireless transceiver as the passive transmission power of the response frame; and transmitting the response frame at the passive transmission power within the short frame interval after receiving the data packet.

This disclosure provides methods, components, devices and systems for overlapping physical layer protocol data unit (PPDU) end point offset. Some aspects more specifically relate to staggering the end times of overlapping PPDUs transmitted by multiple access points (APs) such that the corresponding block acknowledgments (BAs) are staggered by durations exceeding BA locking periods for the APs. In some examples, a BA may be transmitted by a wireless station (STA) to an AP a short interframe space (SIFS) after the end time of a PPDU transmitted by the AP. When multiple APs transmit concurrent PPDUs, multiple STAs may accordingly transmit corresponding BAs. By implementing techniques to stagger the BAs, an AP that locks onto a BA and determines that the BA is intended for another AP can receive a next staggered BA intended for the AP.

The present disclosure relates to a method and device for retransmitting an initial control response in a wireless LAN system. A method performed by an electronic device operating as a first station (STA) in a wireless LAN network according to an embodiment of the present disclosure comprises the steps of: receiving an initial control frame (ICF) from a second STA; transmitting a first initial control response (ICR) to the second STA after a short inter frame space (SIFS) from a time point at which reception of the ICF is completed; and transmitting a second ICR corresponding to the first ICR to the second STA when a wireless medium (WM) is in an idle state until after a point coordination function inter frame space (PIFS) from a time point at which transmission of the first ICR is completed, and ICR retransmission is activated.

The invention discloses a method for reducing mutual interference of wifi and Bluetooth on the same equipment. When the wifi module of the local equipment needs to send any frame in a certain wifi time slice, judging whether the frame requires the receiving equipment to immediately reply a response frame or not; if the frame is sent at the current moment, the wifi module of the local equipment judges whether the sum of the air interface time occupied by the frame, the time of a short inter-frame interval (SIFS) and the air interface time of a response frame exceeds the residual length of the current wifi time slice or not if the frame is sent at the current moment; if not, the wifi module of the local equipment judges whether the air interface time occupied by the frame exceeds the residual length of the current wifi time slice if the frame is sent at the current moment; according to the invention, the receiving and sending behaviors of the wifi module are limited in the time slice when the wifi module is allocated to use the radio frequency resource as much as possible, and the influence of wifi receiving and sending on the Bluetooth signal is effectively avoided.

An apparatus configured to generate, for transmission, an initial control frame (ICF) for a transmission opportunity (TXOP) comprising a first duration and a second duration, wherein the first duration is set based on a time for a TXOP responder station to respond to the ICF with an initial control response (ICR) and a Short Interframe Space (SIFS), and wherein the second duration is set based on a time for data to be transmitted to the TXOP responder station, process, based on signaling received from the TXOP responder station, the ICR and generate, for transmission to the TXOP responder station, one or more data transmissions during the TXOP.

A wireless transceiver device includes a communication module and a processor. The processor is used for performing the following operations: determining whether to perform an active spatial reuse transmission when detecting an overlapping basic service set packet; entering a backoff phase when determining that the active spatial reuse transmission is to be performed; pausing the backoff phase when detecting a data packet of which a destination is the wireless transceiver device before the backoff phase ends, and receiving the data packet; determining a lower one of a minimum transmission power of a response frame in response to the data packet and an active transmission power corresponding to the wireless transceiver device as a passive transmission power of the response frame; and transmitting the response frame with the passive transmission power in a short inter-frame space after the data packet is received.

A method and devices are disclosed for geo-location of wireless local area network (WLAN) devices. According to one aspect, a method for determining a corrected round trip times (RTT) resulting from communication with a WD is provided. The WD is configured with one or two short interframe spacings (SIFS). The method includes performing RTT measurements at successive times. The method includes determining a presence of one or two modes based at least in part on peaks of a kernel density estimation (KDE) surface. The KDE surface is determined from the RTT measurements. When there is only one mode, a corrected RTT is determined based on the RTT measurements and a first SIFS. When there are two modes, a corrected RTT is determined based on the RTT measurements and the first SIFS plus an SIFS offset (Δ), Δ being based at least in part on a difference between the two modes.

In one example, a first wireless communication station (STA) may be configured to identify an estimated end of a frame transmitted from a second STA to an Access point (AP); and to transmit a transmission to the AP within a Short-Inter-Frame-Space (SIFS) beginning at the estimated end of the frame from the second STA. For example, a duration of the transmission may be no longer than the SIFS. For example, the transmission to the AP may be on a same wireless communication channel as the frame from the second STA. In another example, an AP may be configured to process a frame from a first STA; and to process a transmission from a second STA, the transmission from the second STA received within a SIFS beginning at an end of the frame from the first STA.

The invention relates to network allocation vector setting and updating during a transmit opportunity. An apparatus is configured to generate, for transmission, an initial control frame (ICF) for a transmit opportunity (TXOP), the initial control frame (ICF) including a first duration set based on a time required by a TXOP responder station to respond to the ICF with an initial control response (ICR) and a short inter-frame spacing (SIFS), and a second duration set based on a time required by the TXOP responder station to respond to the ICF with a short inter-frame spacing (SIFS). And wherein the second duration is set based on a time required to transmit data to the TXOP responder site; processing the ICR based on a signaling received from the TXOP responder station; and generating one or more data transmissions during the TXOP for transmission to the TXOP responder site.

The application discloses a method for measuring background noise of a communication channel, which comprises the following steps: switching a communication device from a first frequency point to a second frequency point in a short interframe interval after the communication device sends data, the first frequency point being a frequency point used by the communication device in an original transceiving process, and the second frequency point being a frequency point for which background noise is to be tested; opening a receiving channel of the communication device to sample signals; switching the frequency point of the communication device back to the first frequency point after the sampling is completed, and continuing the original transceiving process; and calculating the energy of the sampled signals as background noise. The application utilizes the characteristics of wireless communication to switch the frequency point of the communication device to the frequency point for which background noise is to be tested at a suitable time to collect background noise signals, the communication channel is in an idle state during the collection, and pure background noise can be easily detected, so that the reliability is high. Moreover, the method of the application completes the switching of the frequency and the collection of the signals in a short time, does not affect current communication, and is practical.