Abstract: A device, system and method are provided for wirelessly transmitting a sequence of video packets containing video data for one or more video frames. An importance metric associated with a priority of transmitting each individual packet in the sequence of video packets is independently computed, a retry limit or packet lifetime for each individual video packet in the sequence of video packets is independently determined based on the importance metric, and each video packet in the sequence of video packets is attempted to be transmitted. If the transmission attempt for an individual video packet in the sequence fails, the transmission attempt is repeated for up to the retry limit or the packet lifetime independently determined for the individual packet or until a successful transmission is achieved, whichever occurs first.

Abstract: A device, system and method are provided for wirelessly transmitting a sequence of video packets containing video data for one or more video frames. An importance metric associated with a priority of transmitting each individual packet in the sequence of video packets is independently computed, a retry limit or packet lifetime for each individual video packet in the sequence of video packets is independently determined based on the importance metric, and each video packet in the sequence of video packets is attempted to be transmitted. If the transmission attempt for an individual video packet in the sequence fails, the transmission attempt is repeated for up to the retry limit or the packet lifetime independently determined for the individual packet or until a successful transmission is achieved, whichever occurs first.

Abstract: A wireless device operates as a wireless station (STA) associated with a first access point (AP) of one basic service set (BSS) in a first set of intervals, and as a second AP of another BSS in a second set of intervals. The wireless device, operating as a STA receives, in a first interval of the first set of intervals, indication that data is buffered in the first AP for the STA. The wireless device, operating as a STA issues, in a second interval of the first set of intervals, a request to the first AP for at least some portion of the buffered data. The second interval is later than the first interval and separated from the first interval by a third interval, the wireless device operating as the second AP in the third interval. Due to such operation, efficiencies such as reduced data loss can be obtained.

Abstract: A dual-mode device may compute an expected time instance of arrival of a first beacon based on prior received beacons. If the first beacon is received at an actual time instance which is in variance with the expected time instance, the device re-computes a sequence of future time instances of arrival of respective future beacons and schedules a sequence of station windows, with each station window to cover the corresponding future time instance of the sequence of future time instances and to have a desired first period. The dual-mode device operates in station mode in the sequence of station windows and in the AP mode in a sequence of AP windows, wherein each station window of the sequence of station windows is operated alternately with each AP window of the sequence of AP windows in a TDM manner, with each AP window having a desired second period.

Abstract: A wireless station (STA) of a wireless network transmits parallel data streams. The STA maintains transmission profiles, each corresponding to a respective data stream of parallel data streams. A transmission profile contains a set of rules or parameters, which are used for determining various characteristics in relation to transmission of packets in the corresponding data stream. The STA queues packets of each data stream in a corresponding queue. The STA selects a packet from a queue, and determines a transmission rate for the selected packet according to a transmission profile of the queue. The STA transmits the packet at the determined transmission rate. In an embodiment, the wireless network corresponds to an IEEE 802.11 network.

Abstract: A wireless station (STA) of a wireless network transmits parallel data streams. The STA maintains transmission profiles, each corresponding to a respective data stream of parallel data streams. A transmission profile contains a set of rules or parameters, which are used for determining various characteristics in relation to transmission of packets in the corresponding data stream. The STA queues packets of each data stream in a corresponding queue. The STA selects a packet from a queue, and determines a transmission rate for the selected packet according to a transmission profile of the queue. The STA transmits the packet at the determined transmission rate. In an embodiment, the wireless network corresponds to an IEEE 802.11 network.

Abstract: A wireless device operates as a wireless station (STA) associated with a first access point (AP) of one basic service set (BSS) in a first set of intervals, and as a second AP of another BSS in a second set of intervals. The wireless device, operating as a STA receives, in a first interval of the first set of intervals, indication that data is buffered in the first AP for the STA. The wireless device, operating as a STA issues, in a second interval of the first set of intervals, a request to the first AP for at least some portion of the buffered data. The second interval is later than the first interval and separated from the first interval by a third interval, the wireless device operating as the second AP in the third interval. Due to such operation, efficiencies such as reduced data loss can be obtained.

Abstract: According to an aspect, a wireless station uses a low-frequency clock during sleep intervals and a high-frequency clock during awake intervals. Drift between the low-frequency clock and the high-frequency clock are corrected to enable aligning a wake time instant of the wireless receiver with start of beacon transmissions from an access point, and thereby to reduce power wastage. According to another aspect, errors between the clock of an access point and that of a wireless station are corrected. The wireless station computes an error between the clocks, and extrapolates the error for a sleep interval to compute a wake-up time instant. The correction and extrapolation are performed in every awake interval. Again, undesired power consumption in the wireless station is thereby reduced.

Abstract: A dual-mode device may compute an expected time instance of arrival of a first beacon based on prior received beacons. If the first beacon is received at an actual time instance which is in variance with the expected time instance, the device re-computes a sequence of future time instances of arrival of respective future beacons and schedules a sequence of station windows, with each station window to cover the corresponding future time instance of the sequence of future time instances and to have a desired first period. The dual-mode device operates in station mode in the sequence of station windows and in the AP mode in a sequence of AP windows, wherein each station window of the sequence of station windows is operated alternately with each AP window of the sequence of AP windows in a TDM manner, with each AP window having a desired second period.

Abstract: A wireless station (STA) of a wireless network transmits parallel data streams. The STA maintains transmission profiles, each corresponding to a respective data stream of parallel data streams. A transmission profile contains a set of rules or parameters, which are used for determining various characteristics in relation to transmission of packets in the corresponding data stream. The STA queues packets of each data stream in a corresponding queue. The STA selects a packet from a queue, and determines a transmission rate for the selected packet according to a transmission profile of the queue. The STA transmits the packet at the determined transmission rate. In an embodiment, the wireless network corresponds to an IEEE 802.11 network.

Abstract: According to an aspect, a wireless station uses a low-frequency clock during sleep intervals and a high-frequency clock during awake intervals. Drift between the low-frequency clock and the high-frequency clock are corrected to enable aligning a wake time instant of the wireless receiver with start of beacon transmissions from an access point, and thereby to reduce power wastage. According to another aspect, errors between the clock of an access point and that of a wireless station are corrected. The wireless station computes an error between the clocks, and extrapolates the error for a sleep interval to compute a wake-up time instant. The correction and extrapolation are performed in every awake interval. Again, undesired power consumption in the wireless station is thereby reduced.

Abstract: A wireless device which operates according to a first protocol specification in active durations specified by the first protocol, and according to a second protocol specification in the idle durations specified by the first protocol specification. In an embodiment, the first protocol specification corresponds to IEEE 802.15.4 standard and the second protocol specification corresponds to IEEE 802.11 family of standards.

Abstract: A wireless device which operates according to a first protocol specification in active durations specified by the first protocol, and according to a second protocol specification in the idle durations specified by the first protocol specification. In an embodiment, the first protocol specification corresponds to IEEE 802.15.4 standard and the second protocol specification corresponds to IEEE 802.11 family of standards.

Abstract: A wireless device which operates according to a first protocol specification in active durations specified by the first protocol, and according to a second protocol specification in the idle durations specified by the first protocol specification. In an embodiment, the first protocol specification corresponds to IEEE 802.15.4 standard and the second protocol specification corresponds to IEEE 802.11 family of standards.

Abstract: According to an aspect, a wireless station uses a low-frequency clock during sleep intervals and a high-frequency clock during awake intervals. Drift between the low-frequency clock and the high-frequency clock are corrected to enable aligning a wake time instant of the wireless receiver with start of beacon transmissions from an access point, and thereby to reduce power wastage. According to another aspect, errors between the clock of an access point and that of a wireless station are corrected. The wireless station computes an error between the clocks, and extrapolates the error for a sleep interval to compute a wake-up time instant. The correction and extrapolation are performed in every awake interval. Again, undesired power consumption in the wireless station is thereby reduced.

Abstract: A wireless device which operates according to a first protocol specification in active durations specified by the first protocol, and according to a second protocol specification in the idle durations specified by the first protocol specification. In an embodiment, the first protocol specification corresponds to IEEE 802.15.4 standard and the second protocol specification corresponds to IEEE 802.11 family of standards.

Abstract: A wireless device provided according to an aspect of the present invention first operates as an access point (AP) and transmits instructions which instruct associated stations to desist from transmitting data packets to the AP. According to another aspect, the instructions correspond to CTS-to-self signal, but the AP also desists from transmission of data packets in the desist duration. According to another aspect, the wireless device operates as a station in the desist duration and switches back as an AP after end of the desist duration. In an embodiment, the station scans for other APs/stations in the communication range, and associates with one of such APs also.

Abstract: According to an aspect, a wireless station uses a low-frequency clock during sleep intervals and a high-frequency clock during awake intervals. Drift between the low-frequency clock and the high-frequency clock are corrected to enable aligning a wake time instant of the wireless receiver with start of beacon transmissions from an access point, and thereby to reduce power wastage. According to another aspect, errors between the clock of an access point and that of a wireless station are corrected. The wireless station computes an error between the clocks, and extrapolates the error for a sleep interval to compute a wake-up time instant. The correction and extrapolation are performed in every awake interval. Again, undesired power consumption in the wireless station is thereby reduced.

Abstract: A wireless station (A) is operated in a power-save mode, in which the station is alternately in power-ON and power-OFF states to reduce power consumption. Wireless station (A) computes at least some future time instances at which another wireless station (B) is expected to start transmitting control messages. Wireless station (A) is ensured to be in the power-ON state in corresponding time intervals encompassing durations of at least some of such future transmissions of control messages by wireless station (B), and is thereby enabled to receive the control messages. In an embodiment, the control messages correspond to group key message updates in which values of a decryption key are transmitted, wireless station (A) being a wireless client, wireless station (B) being an access point, with wireless stations (A) and (B) operating in a wireless network consistent with IEEE 802.11 specifications, and communication between wireless stations (A) and (B) being encrypted.

Abstract: A wireless station (A) is operated in a power-save mode, in which the station is alternately in power-ON and power-OFF states to reduce power consumption. Wireless station (A) computes at least some future time instances at which another wireless station (B) is expected to start transmitting control messages. Wireless station (A) is ensured to be in the power-ON state in corresponding time intervals encompassing durations of at least some of such future transmissions of control messages by wireless station (B), and is thereby enabled to receive the control messages. In an embodiment, the control messages correspond to group key message updates in which values of a decryption key are transmitted, wireless station (A) being a wireless client, wireless station (B) being an access point, with wireless stations (A) and (B) operating in a wireless network consistent with IEEE 802.11 specifications, and communication between wireless stations (A) and (B) being encrypted.