Patent application number | Description | Published |
20100110929 | TRANSMISSION WITH HOPPING FOR PEER-PEER COMMUNICATION - Techniques for transmitting signals using time hopping or time and frequency hopping are described. In one design, a terminal selects different slots to use for transmission in multiple frames with time hopping. Each frame includes multiple slots, and each slot covers a particular time duration. The selected slots are at different time locations in the multiple frames. In another design, a terminal selects different resource units to use for transmission in multiple frames with time and frequency hopping. The selected resource units are at different time and frequency locations in the multiple frames. For both designs, the terminal sends a signal (e.g., a peer discovery signal) in the selected slots or resource units in the multiple frames. The terminal may detect for signals (e.g., peer discovery signals) from other terminals in slots not used for transmission by the terminal. | 05-06-2010 |
20100110999 | TRANSMIT POWER CONTROL BASED ON RECEIVER GAIN SETTING IN A WIRELESS COMMUNICATION NETWORK - Techniques for performing transmit power control based on receiver gain setting in a wireless communication network are described. In an aspect, a terminal A may estimate pathloss to another terminal B, e.g., based on a peer discovery signal received from terminal B. Terminal A may then determine a transmit power level for a peer-to-peer (PTP) signal (e.g., a paging signal) based on the estimated pathloss, a receiver gain setting at terminal B, and a target received power level for the PTP signal. Terminal A may send the PTP signal at the determined transmit power level to terminal B. In another aspect, terminal B may use different receiver gain settings in different time intervals to receive PTP signals from other terminals. Terminal A may then select a suitable time interval to send the PTP signal based on the pathloss and the different receiver gain settings used by terminal B. | 05-06-2010 |
20100189188 | AUTOMATIC GAIN CONTROL (AGC) FOR OFDM-BASED TRANSMISSION IN A WIRELESS COMMUNICATION NETWORK - Techniques for performing automatic gain control (AGC) at a receiver are described. The receiver may receive an OFDM-based symbol composed of a cyclic prefix and a useful portion. The receiver may scale the OFDM-based symbol with an initial receiver gain, adjust the initial receiver gain based on the cyclic prefix, apply the adjusted receiver gain prior to the useful portion, and process the useful portion to recover at least one signal sent by at least one transmitter. The receiver may select the initial receiver gain, e.g., based on a predicted received power level for the at least one transmitter, a pattern of different receiver gains, etc. The receiver may apply the initial receiver gain at the start of the OFDM-based symbol. The receiver may measure the power of a set of samples in the cyclic prefix and may adjust the receiver gain based on the measured power and a target power. | 07-29-2010 |
20100190459 | AUTOMATIC GAIN CONTROL IN A WIRELESS COMMUNICATION NETWORK - Techniques for performing automatic gain control (AGC) at a terminal in a wireless communication network are described. In an aspect, the terminal may use different receiver gain settings to receive different types of signals in different time intervals. The terminal may determine a receiver gain setting for each signal type and may use the receiver gain setting to receive signals of that signal type. In another aspect, the terminal may determine a receiver gain setting for a future time interval based on received power levels for peer terminals expected to transmit in that time interval. The terminal may measure received power levels of signals received from a plurality of terminals. The terminal may determine a set of terminals expected to transmit in the future time interval and may determine the receiver gain setting for the future time interval based on the measured received power levels for the set of terminals. | 07-29-2010 |
20100202400 | TRANSMISSION WITH COLLISION DETECTION AND MITIGATION FOR WIRELESS COMMUNICATION - Techniques for transmitting signals on shared resources in a manner to detect and/or combat collision are described. In an aspect, a terminal may transmit a signal on a subset of resource elements in a resource block, and at least one null resource element with no signal may be used to detect for collision of the signal. In another aspect, different terminals may simultaneously transmit their signals on different subsets of resource elements in a resource block. These different subsets of resource elements may be pseudo-randomly selected to randomize interference. In one design, a terminal may determine a resource block to use for transmission of a signal, select a subset of the resource elements in the resource block, and transmit the signal on the selected resource elements, e.g., to at least one other terminal for peer-to-peer communication. The signal may be a peer discovery signal, a paging signal, etc. | 08-12-2010 |
20100250673 | METHODS AND APPARATUS FOR COMBINED PEER TO PEER AND WIDE AREA NETWORK BASED DISCOVERY - A first wireless communications device includes a wide area network (WAN) interface and a peer to peer interface. The first device discovers the presence of a second wireless communications device via a peer discovery signal, received via its peer to peer interface. The second device has been transmitting, e.g., periodically, certain information, e.g., its location and/or shopping preferences, to a node within the WAN. The detected first signal triggers an application alert in the first device. The first device recovers past information about the second device through a second signal received via its WAN interface. The first device uses information communicated in the first signal, e.g., device identifier information, and information communicated in the second signal, e.g., past location and/or shopping information, to generate a targeted message for the second device. The first device communicates the targeted message via its peer to peer interface in a peer to peer traffic channel. | 09-30-2010 |
20100254308 | METHODS AND APPARATUS FOR PEER DISCOVERY IN A COMMUNICATIONS SYSTEM - Methods and apparatus supporting enhanced discovery operations in peer to peer networks are described. Peer discovery, based on direct peer to peer discovery between two mobile nodes can be somewhat limited, e.g., due to power limitations, processing power, and/or channel conditions. An access point, e.g., base station, monitors for and receives peer discovery signals conveying a set of identifiers from a wireless communications device. The access point retransmits at least one identifier in the set in a wireless peer to peer communications channel. Thus the access point effectively extends the peer discovery range for wireless communications devices utilizing the peer to peer network. Wireless communications devices can monitor for and recover the rebroadcast peer discovery signals from access points. Thus, via access point signaling a wireless communications device can be made situationally aware of other devices of interest which would be otherwise outside its discovery detection range. | 10-07-2010 |
20100272029 | METHODS AND APPARATUS FOR COMMUNICATING INFORMATION - Methods and apparatus for efficiently communicating small amounts of information relatively frequently in a wireless communications system are described. An access point's uplink timing frequency structure includes a set of dedicated uplink communications resources, e.g., expression advertisement interval air link resources, which may be in addition to regular traffic channel resources. The set of dedicated uplink communications resources comprises a small fraction of the total uplink communications resources. An individual one of the set of dedicated uplink communications resources can carry a small amount of information bits. An expression advertisement interval occurs relatively frequently. A wireless communications device, registered with the access point, is allocated one of the set of dedicated uplink resources. The wireless communications device can transmit information using its allocated resource in both a sleep state and an active state. | 10-28-2010 |
20100272081 | COMMUNICATION METHODS AND APPARATUS - Methods and apparatus well suited for efficiently communicating small amounts of information relatively frequently in a wireless communications system are described. An uplink timing frequency structure for an access point includes a set of dedicated uplink communications resources, e.g., expression advertisement interval air link resources. Different ones of the set of dedicated uplink communications resources correspond to different individual wireless communications devices currently registered with the access point. In the downlink timing frequency structure for the access point there are dedicated downlink broadcast communications resources, e.g., expression broadcast interval air link resources and neighbor expression broadcast interval air link resources. Information received on dedicated uplink air link resources is echoed back or selectively echoed back on the dedicated downlink air link resources. Wireless communications devices monitor downlink dedicated air link resources to recover expression information being communicated by other wireless communications devices in its local vicinity. | 10-28-2010 |
20110244893 | METHODS AND APPARATUS FOR PAGING IN WIRELESS COMMUNICATION NETWORKS - Paging congestion control in a wireless communications system is described. Various described methods and apparatus are well suited for use in a peer to peer wireless communications system, e.g., an ad hoc peer to peer wireless network in which decisions are made in a decentralized manner. Wireless terminals, e.g., mobile nodes, monitor other paging activities going on and make back-off, e.g., yielding, decisions with regard to paging based on the results of the monitoring. During a first time interval paging indicator signals are transmitted on paging indicator resources by devices intending to transmit paging signals. During a second time interval paging signals are transmitted on paging signaling resources. Monitored and processed detected paging indicator signals are used by a wireless terminal in deciding whether or not to transmit a paging indicator signal and/or a paging signal. | 10-06-2011 |
20120147745 | METHODS AND APPARATUS FOR DETECTION OF RESOURCE COLLISION IN WIRELESS PEER-TO-PEER COMMUNICATION NETWORKS - A method of operating a wireless device includes selecting a CID with a first node and receiving a signal including an LID on a resource. At least one of the signal or the resource is based on the selected CID. The method further includes determining a presence of a second node using the selected CID based on the LID in the received signal. Another method of operating a wireless device includes selecting a CID with a first node and sending a signal including an LID on a resource. At least one of the signal or the resource is based on the selected CID. | 06-14-2012 |
20120276863 | AUTOMATIC GAIN CONTROL IN A WIRELESS COMMUNICATION NETWORK - Techniques for performing automatic gain control (AGC) at a terminal in a wireless communication network are described. In an aspect, the terminal may use different receiver gain settings to receive different types of signals in different time intervals. The terminal may determine a receiver gain setting for each signal type and may use the receiver gain setting to receive signals of that signal type. In another aspect, the terminal may determine a receiver gain setting for a future time interval based on received power levels for peer terminals expected to transmit in that time interval. The terminal may measure received power levels of signals received from a plurality of terminals. The terminal may determine a set of terminals expected to transmit in the future time interval and may determine the receiver gain setting for the future time interval based on the measured received power levels. | 11-01-2012 |
20130010618 | METHODS AND APPARATUS FOR PROVIDING FLEXIBILITY IN PEER DISCOVERY RANGE AND FREQUENCY OF UPDATES - A method, a computer program product, and an apparatus for wireless communication are provided. The apparatus transmits a first peer discovery signal with a first periodicity/temporal frequency in a first set of peer discovery resources. The apparatus determines an energy on an allocated peer discovery resource of a second set of peer discovery resources. The apparatus refrains from transmitting a second peer discovery signal in the second set of peer discovery resources when the energy is greater than a threshold. The apparatus transmits the second peer discovery signal in the second set of peer discovery resources with a second periodicity/temporal frequency less than the first periodicity/temporal frequency when the energy is less than the threshold. The apparatus may utilize the first set of peer discovery resources every period and the second set of peer discovery resources once every N periods in which once every N periods is the second periodicity. | 01-10-2013 |
20130010767 | COEXISTENCE OF PRIORITY BROADCAST AND UNICAST IN PEER-TO-PEER NETWORKS - A method, a computer program product, and an apparatus are provided. In one configuration, the apparatus transmits a first broadcast signal including information indicating an intention to use a unicast resource for a broadcast. In addition, the apparatus transmits a second broadcast signal in the unicast resource. In another configuration, the apparatus, which is a first wireless device, receives a first broadcast signal from a second wireless device including information indicating an intention to use a unicast resource for a broadcast. In addition, the apparatus receives a first scheduling signal from the second wireless device in a scheduling resource. The first scheduling signal is for indicating a second intention to use the unicast resource for transmitting a second broadcast signal. Furthermore, the apparatus refrains from transmitting a second scheduling signal in the scheduling resource in response to the first scheduling signal. | 01-10-2013 |
20130013181 | ROAD-TRAFFIC-BASED GROUP, IDENTIFIER, AND RESOURCE SELECTION IN VEHICULAR PEER-TO-PEER NETWORKS - A method, a computer program product, and an apparatus for wireless communication are provided. The apparatus adjusts a number of sets of identifiers in a plurality of sets of identifiers based on traffic information. In addition, the apparatus selects an identifier from a set of identifiers of the plurality of sets of identifiers based on the traffic information. Furthermore, the apparatus communicates using resources associated with the selected identifier. The traffic information may include at least one of direction of travel, map information, velocity, whether approaching an intersection, whether departing an intersection, location, a number of vehicles within a particular area, information from other vehicles, type of intersection, whether the intersection includes stop lights or stop signs, at least one computed value based on acquired traffic information, or information from other wireless devices. | 01-10-2013 |
20130176856 | METHODS AND APPARATUS FOR FACILITATING CHANNEL ACCESS IN A COMMUNICATION SYSTEM - A transmission initiation interval timing structure is used in combination with a lower layer timing structure, e.g., physical layer timing structure. A device selects a subset of packet transmission initiation intervals and then limits initiation of packet transmission to those intervals thereby reducing the potential for collisions. Packet transmission may occur outside the initiation interval in which the transmission is initiated. In some embodiments, packet transmission length is intentionally limited to sizes which can be transmitted in a fraction of the amount of time the physical layer allows a single device to continuously transmit, e.g., in an amount of time which is equal to or less than the duration of a packet transmission initiation interval. This increases the probability that multiple devices will be able to successfully transmit small packets at short intervals on a regular basis even when carrier sensing techniques are used. | 07-11-2013 |
20130273951 | METHODS AND APPARATUS BY WHICH PERIODICALLY BROADCASTING NODES CAN RESOLVE CONTENTION FOR ACCESS TO A SMALLER POOL OF BROADCASTING RESOURCES - A method, a computer program product, and an apparatus for wireless communication are provided. The apparatus transmits broadcast information in a first broadcast resource from a first set of broadcast resources. In addition, the apparatus determines based on the broadcast information a need for a second broadcast resource from a second set of broadcast resources. Furthermore, the apparatus selects the second broadcast resource based on a priority associated with the first broadcast resource. | 10-17-2013 |
20140335884 | LOCATION BASED USE OF THE DSRC SPECTRUM - Methods, systems, and devices are described for using location information to determine whether to use at least a portion of a dedicated short range communications (DSRC) spectrum. Current location information of a multi-mode device is determined. The multi-mode device is operating outside of the DSRC spectrum. The current location information is used to determine whether the multi-mode device is located outside of geographical region attributed to DSRC transmissions. Upon determining that the multi-mode device is located outside of the geographical region, at least a portion of the DSRC spectrum is used for transmissions by the multi-mode device. | 11-13-2014 |
20140357193 | DSRC LISTEN MODE FOR WI-FI USING DSRC SPECTRUM - Methods, systems, and devices are described for detecting dedicated short range communications (DSRC) transmissions to determine whether to use at least a portion of the DSRC spectrum. In one embodiment, a multi-mode device may be operated outside of the DSRC spectrum using a first clock rate, and may then be switched to a second clock rate while operating outside of the DSRC spectrum to detect DSRC transmissions using the DSRC spectrum. | 12-04-2014 |
20140370809 | INTER-FRAME SPACING ADAPTATION FOR YIELDING TO DSRC OPERATION - Methods, systems, and devices are described for adapting access timing parameters when using DSRC spectrum. A multi-mode device may adapt at least one access timing parameter while operating within the DSRC spectrum. The at least one access timing parameter may be adapted to provide priority to transmissions of DSRC devices using the DSRC spectrum. The multi-mode device may increase a duration of a short inter-frame spacing (SIFS) to be at least equal to a duration of a SIFS used by a DSRC device. | 12-18-2014 |
20140378054 | OPPORTUNISTIC USE OF THE DSRC SPECTRUM - Methods, systems, and devices are described for opportunistically using at least a portion of a dedicated short range communications (DSRC) spectrum. A multi-mode device is operated outside of the DSRC spectrum. An activity level is detected on at least a portion of the DSRC spectrum, and it is determined whether to use at least the portion of the DSRC spectrum based at least in part on the detected activity level. | 12-25-2014 |