Patent application number | Description | Published |
20090067407 | KEEP-ALIVE FOR WIRELESS NETWORKS - A transmitting device transmits data to one or more receiving devices. At least one of the receiving devices transmits a keep-alive to the transmitting device. The keep-alive is transmitted at a reduced rate relative to the data transmission rate. In some implementations multiple receiving devices may transmit keep-alives. In these cases, each receiving device may transmit its keep-alives according to a schedule to prevent or reduce the likelihood of overlapping keep-alives. In some implementations a receiving device may be selected to transmit keep-alives. Here, if the selected receiving device stops transmitting keep-alives another receiving device is selected to transmit keep-alives. Through the use of the above techniques, the transmitting device need not keep track of which receiving devices are listening to the data transmission. Rather, the transmitting device may simply stop transmitting in the event that it no longer receives keep-alives. | 03-12-2009 |
20090086702 | RANDOMIZATION OF PERIODIC CHANNEL SCANS - An apparatus and method for wireless communications supports a periodic scan for wireless devices. The periodic scan includes a plurality of scans spaced apart in time. The phase of the periodic scan is changed in response to one of the wireless devices being detected in one of the scans. | 04-02-2009 |
20090270030 | MULTI-LEVEL DUTY CYCLING - A duty cycle scheme for wireless communication employs three or more duty cycle levels. In some aspects, a wireless device may continually scan for signals in an active state associated with a first duty cycle, periodically scan for signals during a periodic state associated with a second duty cycle, and periodically scan for signals during a standby state associated with a third duty cycle. Here, the second duty cycle may be lower than the first duty cycle and the third duty cycle may be lower than the second duty cycle. In some aspects the timing of different states may be correlated. In some aspects each wireless in a system may independently control its duty cycle states. | 10-29-2009 |
20090274326 | SYNCHRONIZATION OF SIGNALS FOR MULTIPLE DATA SINKS - A data source sends a synchronization signal and information to several data sinks that use the synchronization signal and a specified parameter to determine when to process the information. The data source and data sinks may comprise wireless nodes such as, for example, a wireless audio source that sends multi-channel data to a pair of wireless earpieces. The wireless earpieces use the synchronization signal and a latency interval to determine the appropriate time to output audio based on the audio channels. | 11-05-2009 |
20100045508 | TWO-WAY RANGING WITH INTER-PULSE TRANSMISSION AND RECEPTION - Relatively short turnaround times are provided in conjunction with two-way ranging to, for example, facilitate accurate ranging measurements when the relative clock drift between ranging nodes (e.g., devices) is relatively high. In some aspects, relatively short turnaround times are achieved through the use of a symmetric channel that is defined to enable concurrent transmission of ranging messages between nodes. For example, a symmetric channel may be established by configuring the nodes to receive one or more pulses associated with a received ranging message in between pulse transmissions associated with a transmitted ranging message. In this way, one node may send a ranging timestamp shortly after the other nodes sends its ranging timestamp, thereby mitigating the impact of the clock drift on the ranging measurements. In some aspects the pulses may comprise ultra-wideband pulses. The techniques described herein may be employed to provide two-way ranging in, for example, low power and/or non-coherent wireless devices. | 02-25-2010 |
20100046443 | ADDRESSING SCHEMES FOR WIRELESS COMMUNICATION - In an addressing scheme for wireless communication a communication channel may be defined based on a unique identifier associated with a destination node or a source node. In addition, a short identifier may be included in messages sent over the communication channel such that a node may uniquely identify the source node or destination node for the message. A node may use a short identifier as an index into a lookup table to determine one or more parameters to be used for communicating with another node. | 02-25-2010 |
20100074366 | SYSTEM AND METHOD FOR ACKNOWLEDGEMENT PACKET TRANSMITTING AND RECEIVING - A communications method comprising the steps of receiving a data packet; processing the data packet; and transmitting an ack packet approximately at an end of a first defined time interval if the processing of the data packet is completed within the first defined interval, or transmitting the ack packet approximately at an end of a second defined time interval if the processing of the data packet is not completed within the first defined interval and is completed within the second defined interval. Another communication method comprising the steps of transmitting a data packet; scanning a channel for an ack packet approximately at an end of a first defined time interval from the transmission of the data packet; and scanning the channel for the ack packet approximately at an end of a second defined time interval from the transmission of the data packet if the ack packet was not received within the first defined interval. | 03-25-2010 |
20100086073 | SYSTEM AND METHOD TO IMPLEMENT CONCURRENT ORTHOGONAL CHANNELS IN AN ULTRA-WIDE BAND WIRELESS COMMUNICATIONS NETWORK - A system and method for media access control are disclosed. The method comprises providing concurrent orthogonal channels to access media using pulse division multiple access to define pulse positions, wherein the pulse division multiple access includes a time hopping sequence and an offset to distinguish the concurrent orthogonal channels. In addition, the method comprises processing signals associated with at least one of the orthogonal channels. | 04-08-2010 |
20100128700 | SYSTEM AND METHOD TO IMPLEMENT SYNCHRONOUS CHANNEL TIMING IN A WIRELESS COMMUNICATIONS NETWORK - A system and method to implement synchronous channel timing are disclosed. The method comprises establishing a session time interval. In addition, the method comprises establishing a first time interval within the session time interval for transmitting a first data packet. | 05-27-2010 |
20100165869 | SYSTEM AND METHOD FOR ACKNOWLEDGEMENT PACKET TRANSMITTING AND RECEIVING - A communications method comprising the steps of receiving a data packet; processing the data packet; and transmitting an ack packet approximately at an end of a first defined time interval if the processing of the data packet is completed within the first defined interval, or transmitting the ack packet approximately at an end of a second defined time interval if the processing of the data packet is not completed within the first defined interval and is completed within the second defined interval. Another communication method comprising the steps of transmitting a data packet; scanning a channel for an ack packet approximately at an end of a first defined time interval from the transmission of the data packet; and scanning the channel for the ack packet approximately at an end of a second defined time interval from the transmission of the data packet if the ack packet was not received within the first defined interval. | 07-01-2010 |
20100172393 | PULSE ARBITRATION FOR NETWORK COMMUNICATIONS - An apparatus for communications configured to support first and second spread-spectrum channels, each of the first and second channels being based on a different pseudorandom sequence. The apparatus further configured to select one of the first and second channels for communications to avoid a collision of information that would otherwise occur based on their pseudorandom sequences. | 07-08-2010 |
20100235689 | APPARATUS AND METHOD FOR EMPLOYING CODES FOR TELECOMMUNICATIONS - A transmitting apparatus generates a first bit stream from a second bit stream by encoding at least a portion of the bits from the second bit stream, generates a code for the second bit stream, and attaches the code to the first bit stream for transmission to a receiving apparatus. A receiving apparatus receive from a transmitting apparatus a first bit stream with a code, generates a second bit stream from the first bit stream by decoding at least a portion of the bits from the first bit stream, computes the code for the second bit stream, and compares the computed code with the code from the first bit stream. | 09-16-2010 |
20100246823 | APPARATUS AND METHOD FOR ADDRESS PRIVACY PROTECTION IN RECEIVER ORIENTED CHANNELS - Disclosed is a method for address privacy protection for a first wireless device sharing a privacy key with a second wireless device. In the method, a first resolution tag is generated at the first wireless device using a pseudo-random function with the seed value and the privacy key as input arguments. The privacy key is only known to the first and second wireless devices. A privacy address is generated for the first wireless device based on the seed value and the first resolution tag. A packet is transmitted from the first wireless device to the second wireless device. The packet includes the privacy address and the first resolution tag. | 09-30-2010 |
20110078445 | Method For Establishing A Wireless Link Key Between A Remote Device And A Group Device - Disclosed is a method for establishing a wireless link key between a remote device and a group device. In the method, the remote device obtains a group identifier from the group device, and determines whether the group device is associated with a group having a trust association with the remote device. When the group device is determined to be associated with a group having an established trust association with the remote device, the remote device forwards a link setup request to the group device for virtually pairing with the group device using the trust association to establish the wireless link key. When the group device is determined not to be associated with a group having an established trust association with the remote device, the remote device forwards a pairing request to the group device for pairing with the group device to establish the wireless link key. | 03-31-2011 |
20110231657 | APPARATUS AND METHOD FOR EMPLOYING CODES FOR TELECOMMUNICATIONS - A transmitting apparatus generates a first bit stream from a second bit stream by encoding at least a portion of the bits from the second bit stream, generates a code for the second bit stream, and attaches the code to the first bit stream for transmission to a receiving apparatus. A receiving apparatus receive from a transmitting apparatus a first bit stream with a code, generates a second bit stream from the first bit stream by decoding at least a portion of the bits from the first bit stream, computes the code for the second bit stream, and compares the computed code with the code from the first bit stream. | 09-22-2011 |
20110305333 | Method and Apparatus for Virtual Pairing with a Group of Semi-Connected Devices - One feature provides a method for a client node to establish a session key with a group node by obtaining an epoch identity value associated with a current epoch, wherein obtaining the epoch identity value includes one of computing the epoch identity value based on a node real time or negotiating the epoch identity value with the group node, computing a restricted key using a shared secret key, the epoch identity value, and a group node identity associated with the group node, and executing a session key establishment protocol with the group node to derive the session key using the restricted key as a master key in the session key establishment protocol. The session key may be established between the group node and the client node even though communications between the group node and the central node is only intermittently available during the current epoch. | 12-15-2011 |
20120281699 | APPARATUS AND METHODS FOR WIRELESS COMMUNICATION USING A PACKET STRUCTURE - In accordance with aspects of the disclosure, a method, apparatus, and computer program product are provided for wireless communication. The method, apparatus, and computer program product may be configured to generate packets, wherein each of the packets comprises a packet header comprising a packet format field comprising a first indicator that indicates whether the packet header comprises a payload length field and whether the packet comprises a payload. The method, apparatus, and computer program product may be further configured to generate a second indicator based on a type of data in the payload, and attach the second indicator to the data. | 11-08-2012 |
20130121221 | Reducing Power Consumption In Wireless Network Stations By Optimizing Contention Period Overhead With Station Grouping, Proxy CSMA, And TIM Monitoring - A method of saving power in a wireless network can include determining a plurality of stations associated with an AP. The AP can create station groups using group selection logic. Notably, the group selection logic is transparent to the plurality of stations. A plurality of TIMs can then be sent, each TIM allowing only one station group access to a channel during a predetermined time interval, such as a beacon interval. In another method, a station can determine its sleep duration based on at least one of first information from the TIM to generate random sleep duration, second information regarding previous operation of the station, and third information regarding a status of the station. The first, second, and third information can include the number of stations associated with the AP and having buffered data based on the TIM, historical collisions, and power status. | 05-16-2013 |
20130252659 | MULTI-LEVEL DUTY CYCLING - A duty cycle scheme for wireless communication employs three or more duty cycle levels. In some aspects, a wireless device may continually scan for signals in an active state associated with a first duty cycle, periodically scan for signals during a periodic state associated with a second duty cycle, and periodically scan for signals during a standby state associated with a third duty cycle. Here, the second duty cycle may be lower than the first duty cycle and the third duty cycle may be lower than the second duty cycle. In some aspects the timing of different states may be correlated. In some aspects each wireless in a system may independently control its duty cycle states. | 09-26-2013 |
20140004899 | SYSTEM AND METHOD FOR CONTROLLING PAGING DELAY | 01-02-2014 |
20140018068 | SYSTEM AND METHOD FOR CONTROLLING PAGING DELAY WITH TIMING ARRANGEMENTS AND DUAL PAGE SCANS - Systems and methods for controlling a delay associated with paging a remote device. In one implementation, a paging device arranges page operations such that if one of two consecutive page scans performed by a remote device occurs during a response scan, the other page scan occurs during the transmission of a page. In another implementation, a device scanning for a page arranges page scans such that if one of two consecutive page scans occurs during a page response scan, the other page scan occurs during the transmission of a page. In another implementation, a device scanning for a page performs a series of sets of separate page scans, wherein the time interval between two of separate scans in a set is less than the time interval between adjacent sets. The page scans in a set are configured to ensure that one of them occurs during the transmission of a page. | 01-16-2014 |
20140051351 | METHOD OF USING ZONING MAP FOR BEAM SEARCHING, TRACKING AND REFINEMENT - The disclosure is directed to a wireless communications device. In an embodiment, the wireless communications device comprises a phased antenna array comprising a plurality of antennas, a transceiver operatively coupled to the phased antenna array and configured to control the plurality of antennas and an antenna weight vector (AWV), a memory storing a spherical zoning map, and a beam controller configured to control the transceiver by setting the AWV for each antenna of the plurality of antennas. | 02-20-2014 |
20140055302 | UPDATING A BEAM PATTERN TABLE - An apparatus that employs a directional antenna system updates a beam pattern table that includes entries corresponding to each of the other apparatuses with which the apparatus communicates. For example, for each of the other apparatuses, the beam pattern table may specify the antenna weights to be used to provide a quasi-omni-directional beam pattern, a sector level beam pattern, and a refined beam pattern when communicating with that other apparatus. In some aspects, the beam pattern table includes one or more characteristics associated with each of the beam patterns. These characteristics may be used in conjunction with a beam search criterion to trigger updating of the beam pattern table. | 02-27-2014 |
20140071838 | SELECTING A MODULATION AND CODING SCHEME FOR BEAMFORMED COMMUNICATION - In adaptive modulation and coding scheme (MCS) selection for directional antenna systems, at least one table is defined that maps different ranges of signal quality values to different sets of MCS parameters. In some implementations, each range corresponds to a separate table (e.g., a given table will include the MCS and other information for that range of signal quality values). In the event an abrupt change in signal quality is detected (e.g., a change in received signal strength greater than or equal to a defined threshold), instead of using a conventional rate selection algorithm, a new MCS is selected through the use of the ranges from the table(s). In this way, a relatively large change in MCS may be accommodated, if warranted by the change in signal quality. | 03-13-2014 |
20140071955 | Dynamic Sounding Control In Wifi - A method of performing dynamic sounding in a wireless communication device includes determining whether to perform sounding based on an age of current channel state information (CSI). An achievable throughput can be recorded as a reference throughput after performing the sounding. A current achievable throughput can be compared with the reference throughput. A CSI timestamp can be reset when the current throughput is above the reference throughput by a first predetermined amount, thereby prolonging a lifespan of the current CSI. The CSI timestamp can be reduced when the current throughput is below the reference throughput by a second predetermined amount, thereby reducing the lifespan of the current CSI. | 03-13-2014 |
20140092819 | Scheduling Transmission For Multi-User, Multiple-Input, Multiple-Output Data - An access point determines the buffered data for each station of a plurality of stations in a BSS and groups the stations with similar station characteristics. The transmission time to the stations in a group can be apportioned. The groups can be ordered based on station characteristics and a transmission history. A sounding for a group can be performed based on the order. The MU-MIMO transmission for the group can be performed until a first condition is met. If the first condition is met, then the sounding and the MU-MIMO transmission for a next group can be performed, according to the order, until a second condition is met. The first condition can include an apportioned transmission time having expired and/or the buffers for the group being flushed. The second condition can include new data having been buffered by the AP and/or all buffered data having been transmitted. | 04-03-2014 |
20140119582 | SYNCHRONIZATION OF SIGNALS FOR MULTIPLE DATA SINKS - A data source sends a synchronization signal and information to several data sinks that use the synchronization signal and a specified parameter to determine when to process the information. The data source and data sinks may comprise wireless nodes such as, for example, a wireless audio source that sends multi-channel data to a pair of wireless earpieces. The wireless earpieces use the synchronization signal and a latency interval to determine the appropriate time to output audio based on the audio channels. | 05-01-2014 |
20140133303 | Multicast Rate Control - A method of providing multicast rate control in a wireless communication device can include transmitting data frames to a plurality of stations in a multicast group with a first data rate. Acknowledgements (ACKs) can then be requested from a first subset of the plurality of stations. Frame losses can be determined using the ACKs from the first subset. A second data rate can be determined based on the frame losses with the first subset. A second subset of the plurality of stations can be selected based on the frame losses with the first subset. Data frames can be transmitted to the plurality of stations with the second data rate. Notably, ACKs only from the second subset of the plurality of stations are requested. Frame losses for the second subset can be determined using those ACKs. A current data rate can be adjusted based on the frame losses for the subset and at least one predetermined threshold. Data frames can be transmitted to the plurality of stations using the adjusted data rate. | 05-15-2014 |
20140153458 | POWER SAVING MODES IN WIRELESS DEVICES - Various aspects of apparatus for accessing a network through a wireless access point and methods of power savings for such apparatus include scheduling a sleep state interval, entering a sleep state at the beginning of the scheduled sleep interval, and buffering data during the sleep state for transmission following the sleep state. | 06-05-2014 |
20140153459 | POWER SAVING MODES IN WIRELESS DEVICES - Various aspects of apparatus for accessing a network through a wireless access point and methods of power savings for such apparatus include autonomously alternating between a listen state and the sleep state during a time period in which no data is detected from the remote apparatus, and progressively increase the sleep state interval during the time period for at least a portion of the time period. | 06-05-2014 |
20140153460 | POWER SAVING MODES IN WIRELESS DEVICES - Various aspects of apparatus for accessing a network through a wireless access point and methods of power savings for such apparatus include operating in a sleep state, and scheduling one or more sleep state intervals for operating in the sleep state during a time period, wherein the scheduled one or more sleep state intervals are based on one or more wireless transmission parameters. | 06-05-2014 |
20140160947 | Method And System for Unified Rate Adaptation For SU-BF And MU-MIMO Operation - A method of providing rate adaptation in a multi-user wireless communication system including single-user beamforming (SU-BF) and multi-user multiple-input multiple-output (MU-MIMO) is described. In this method, a master rate, which is a modulation and coding scheme (MCS) for the SU-BF, is determined. An MCS for each transmit mode is derived from the master rate using a rate mapping. Using the results from the mapping, the master rate, instead of the MCS for each transmit mode, is tracked. In one embodiment, a mapping calibration is periodically performed. | 06-12-2014 |
20140211642 | Method And System For Boosting Transmission Settings Based On Signal To Interference And Noise Ratio - A method of performing transmission from an access point (AP) in a wireless communication system provides transmission setting adjustment after sounding. In this method, stations associated with the AP and having transmission data can be identified. Transmission to those stations can be performed using a predetermined transmission setting. For a first transmission after a sounding, the predetermined transmission setting can be boosted. For any transmission other than the first transmission after the sounding, a current or adjusted transmission setting can be used based on a detected PER during transmission. An adjusted transmission setting can be an MCS rate, a user-level (SU-BF, 2U-MIMO, or 3U-MIMO), or an aggregated MAC protocol data unit (AMPDU) aggregation level. A single transmission setting or a combination of settings can be used. The method can be used with any transmission setting(s), including those mapped from the Signal to Interference and Noise Ratio (SINR). | 07-31-2014 |
20140219110 | Method And System For Dynamic AMPDU Duration Control In A Wireless Communication System - A method of providing aggregated MAC protocol data unit (AMPDU) duration control in a wireless communication device includes setting an AMPDU duration. Pass/fail statistics are collected for each MPDU of an AMPDU in a time window, W. A packet error rate (PER) difference is calculated between first and last sets of MPDUs for each AMPDU in the window. An average PER difference is calculated across all AMPDUs in the window. When the average PER difference is greater than a first threshold, then the AMPDU duration is decreased. When the difference is less than a second threshold, then the AMPDU duration is increased. When the difference is within the first and the second thresholds, then the method returns to the step of collecting for a next time window. The AMPDU duration can also be adjusted based on detected Doppler and line-of-sight transmissions. | 08-07-2014 |
20140219111 | Method And System For Dual-Mode Rate Control In A Wireless Communication System - A method of performing dual-mode rate control for an access point in a wireless communication system includes a single-user mode of operation and a multi-user mode of operation. In the single-user mode, a basic rate for a station is determined based on channel conditions. In the multi-user mode, a rate for a plurality of stations is determined using tracking. The tracking includes performing a sounding for the plurality of stations. An initial multi-user current rate is then set equal to a function of a number of users and the basic rate. A transmission is sent to the plurality of stations using the current rate. A packet error rate (PER) is detected during transmission to the plurality of stations. The current rate is adjusted based on the PER. After rate adjustment, either sounding is triggered or the method returns to sending a transmission using the current rate. | 08-07-2014 |
20140241226 | Polling Beacon - Beacon-poll frames are transmitted from a station (STA) to a wireless AP in an opportunistic manner. In response to receiving a beacon-poll frame, the wireless AP transmits a unicast beacon frame to the STA, thereby eliminating the need for the STA to periodically wake up to receive broadcast beacon frames from the AP. The wireless AP may transmit the unicast beacon frame at a higher speed than a conventional broadcast beacon frame. As a result, the time that the STA must be awake to receive the unicast beacon frame is significantly less than the time that the STA must be awake to receive a conventional broadcast beacon frame, thereby resulting in significant power savings within the STA. The wireless AP may aggregate downlink (DL) data packets to be transmitted to the STA with the unicast beacon frame, resulting in further power savings within the STA. | 08-28-2014 |
20140254349 | SYSTEMS AND METHODS FOR SEAMLESS DATA STREAM TRANSFER DURING BAND SWITCH BETWEEN WIRELESS STATIONS - One innovation includes an apparatus, for wirelessly communicating with a communication system via a first wireless channel and a second wireless channel, including a memory unit that is configured to store a first data packet and a second data packet, the first data packet and the second data packet have consecutive sequence numbers. The apparatus further includes a processor configured to retrieve the first data packet and the second data packet from the memory unit, a transceiver that is configured to transmit the first data packet to the communication system via the first channel, to receive a first acknowledgement from the communication system and to transmit the second data packet to the communication system via the second channel after the processor detects that the first acknowledgement comprises a positive acknowledgement of the first reception information. | 09-11-2014 |
20140254408 | RATE CONTROL ASSOCIATED WITH FRAME AGGREGATION - MAC layer frame aggregation and block acknowledgement are used in some WLAN technologies to improve efficiency of a communications channel by reducing PHY layer overhead. A frame aggregation window size defines how many MAC protocol data units (MPDUs) are included in an aggregated MPDU (AMPDU) frame. The frame aggregation window for a subsequent AMPDU frame is typically dependent upon the characteristics of the block acknowledgement—such as the number of non-acknowledged (NAK) MPDUs or the position of a hole in the previous AMPDU frame. A small frame aggregation window size may impact throughput especially at higher transmission rates. In this disclosure a transmission rate may be determined based, at least in part, on a projected frame aggregation window size resulting from a block acknowledgement. The frame aggregation feedback (e.g. block acknowledgement) may be used by a rate control module to determine a transmission rate that optimizes frame aggregation efficiency. | 09-11-2014 |
20140254424 | METHOD AND APPARATUS FOR OPTIMIZING RATE CONTROL BASED ON PACKET AGGREGATION CONSIDERATIONS - Various aspects of the disclosure described herein provide for optimizing rate control during a selection of a communications profile from a set of communications profiles by taking into account effective frame aggregation size as a function of packet error rate (PER). An expected throughput may also be determined for each communications profile and updated after each transmission so that a communications profile having the highest expected throughput may be chosen for a particular frame transmission. | 09-11-2014 |
20140269377 | Methods Permitting A Wireless System Receiver To Determine And Report Channel Conditions To A System Transmitter - A method of providing feedback on channel observations to a transmitter includes observing a channel at a receiver based on received signals from the transmitter and determining whether a packet error rate (PER) is rising based on the observing. The receiver determines whether a rising PER is caused by channel noise or interference, and transmits a message to the transmitter indicating the cause of the rising PER. The cause may be encoded in reserved bits of a block acknowledgement (BA) frame or an Acknowledge (ACK) frame, or in a modulation coding scheme (MCS) used to transmit the message. The cause may be detected in response to SNR/RSSI level of received signals, or a number of receiver restarts. The transmitter may change the transmit rate adaptation algorithm to use a lower MCS if channel noise causes the rising PER, and a higher MCS if interference causes the rising PER. | 09-18-2014 |
20140269468 | SYSTEMS AND METHODS FOR WIRELESS BAND SWITCHING - Systems and methods are disclosed for coordinating operation on multiple frequency bands between two or more multiple concurrent band (MCB) devices. The band switch protocols may include sending information on a second band after a communications link has been established on a first band. The receiving device may treat the transmission of the frame on the new band as a message to switch bands, such that the transmitting and receiving devices may conduct subsequent communications on the new band. Further, the band switch protocols allow for seamless operation over the band switch event. As a result, a frequency band having desired performance characteristics may be selected dynamically. | 09-18-2014 |
20140269655 | Dynamic Rate Control In WiFi Systems - A wireless device is configured to switch data rates to account for temporary channel conditions or device configuration errors. Pre-selected data rates, more likely to achieve maximum goodput, are stored in a data rate table. The data rate table contains candidate data rates for each pre-selected data rate in the data rate table. When probe transmissions using the preselected data rates fail, dynamic rate probing is utilized to determine a possible cause and extent of the problem. The dynamic rate probing scheme transmits probe transmissions using the candidate data rates and tracks success or failure of these probe transmissions. An analysis of the probe transmissions is used to indicate a possible cause and/or extent of the problematic condition and to determine whether there is a need to reconfigure the data rates in the data rate table. | 09-18-2014 |
20140341098 | ACCESS POINT RESPONSE TO PS-POLL - Methods, systems, and devices are described for power conservation in a wireless communications system through efficient transmissions and acknowledgements of information between an AP and a station. The time between a determination by a station to enter a power saving mode and entering network sleep mode by the station may be reduced through a transmission, by an AP, of an MPDU to the station successive to an SIFS after transmission of an acknowledgement to the station of a PS-Poll frame from the station. The time to enter a power saving mode by a station may also be reduced through transmission of A-MPDUs in which a last MPDU of the A-MPDU has an indicator bit cleared to indicate no additional data is to be transmitted. An AP may prevent a retransmission of an MPDU to the station in the absence of an acknowledgement from the station, to further enhance efficiency. | 11-20-2014 |
20140341099 | ACCESS POINT RESPONSE TO PS-POLL - Methods, systems, and devices are described for power conservation in a wireless communications system through efficient transmissions and acknowledgements of information between an AP and a station. The time between a determination by a station to enter a power saving mode and entering network sleep mode by the station may be reduced through a transmission, by an AP, of an MPDU to the station successive to an SIFS after transmission of an acknowledgement to the station of a PS-Poll frame from the station. The time to enter a power saving mode by a station may also be reduced through transmission of A-MPDUs in which a last MPDU of the A-MPDU has an indicator bit cleared to indicate no additional data is to be transmitted. An AP may prevent a retransmission of an MPDU to the station in the absence of an acknowledgement from the station, to further enhance efficiency. | 11-20-2014 |