Patent application number | Description | Published |
20110205887 | METHODS AND APPARATUS FOR COMMUNICATING INFORMATION USING VARIOUS TRANSMISSION POWER LEVELS - A wireless communications device supports a constant transmission power mode of operation and a time varying transmission power mode of operation for transmitting data, e.g., peer discovery data. The device determines an amount of network congestion and switches between the two modes of operation as a function of the determined amount of network congestion. Various described methods and apparatus are well suited for use in a peer to peer ad hoc wireless communications system in which a limited amount of air link resources are available for peer discovery signaling and the same peer discovery resources are, at times, used concurrently by multiple devices. When network congestion is low, the device operates in the constant transmission power mode. When network congestion is high, the device operates in the time varying power mode. Devices sharing a common peer discovery resource in a local area intentionally select different time varying transmission patterns. | 08-25-2011 |
20110292817 | METHODS AND APPARATUS FOR PREEMPTIVE BACKOFF FOR MEDIUM ACCESS IN WIRELESS PEER-TO-PEER NETWORKS - A method of operating a wireless device is provided in which a number of neighboring nodes is estimated, a medium access priority to access a communication resource in a current timeslot is determined, and whether to transmit a scheduling control signal in the current timeslot is determined based on the number of neighboring nodes and the medium access priority. | 12-01-2011 |
20120008571 | METHOD AND APPARATUS FOR DETECTION AND RESOLUTION OF RESOURCE COLLISION IN A PEER-TO-PEER NETWORK - A method of operating a wireless device includes selecting a connection identifier with a first node, receiving a scheduling control signal on a resource associated with the connection identifier, and determining a presence of a second node transmitting on the same resource associated with the connection identifier based on the received scheduling control signal. | 01-12-2012 |
20120014463 | METHODS AND APPARATUS FOR SELECTING AND USING COMMUNICATIONS RESOURCES IN A COMMUNICATION SYSTEM - Methods and apparatus for determining, e.g., selecting, communications resources, e.g., tones, to use in a communications system are described. The methods are well suited for use in Orthogonal Frequency Division Multiplexing (OFDM) systems. Devices seeking to transmit information select tones in pairs for use in transmitting the information. Each tone pair includes a tone and the corresponding image tone. By restricting a communications device to select communications frequencies in pairs, the problem of interference and reduced dynamic range at a receiver due to IQ imbalance is reduced, as compared to the case where devices may use a tone independent of the corresponding image tone for transmission purposes, since the path loss from the transmitter to the receiver is likely to be the same for both tones and the transmission power level is controlled by an individual device using both of the tones. | 01-19-2012 |
20120014471 | METHODS AND APPARATUS FOR MINIMIZING INTER-SYMBOL INTERFERENCE IN A PEER-TO-PEER NETWORK BACKGROUND - The methods and apparatus described herein are used to operate a wireless device. One method of operating a wireless device includes filtering a first set of digital samples using a first filter at a first time to generate a first signal, transmitting the first signal, filtering a second set of digital samples using a second filter at a second time to generate a second signal, and transmitting the second signal. In one embodiment, an apparatus for operating a wireless device includes a processor configured to filter, at a first wireless device, a first set of digital samples using a first filter at a first time to generate a first signal, transmit, from the first wireless device, the first signal, and filter, at the first wireless device, a second set of digital samples using a second filter at a second time to generate a second signal. | 01-19-2012 |
20120015678 | METHODS AND APPARATUS OF TRANSMISSION POWER CONTROL IN THE PRESENCE OF INTERFERENCE - A method of operating a wireless device is provided in which an interference level on a resource is determined. In addition, a signal is transmitted on the resource with a first power when the interference level is low. The first power is such that the signal is received with a first SNR. Furthermore, the signal is transmitted on the resource with a second power when the interference level is high. The second power is such that the signal is received with a second SNR less than the first SNR. | 01-19-2012 |
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 |
20120147857 | METHODS AND APPARATUS FOR RESOLVING TRANSMISSION PRIORITY IN A WIRELESS PEER-TO-PEER NETWORK - Methods and apparatus for initiating a traffic transmission between a first device and a second device are disclosed. One method includes determining whether the first device has a receive priority or a transmit priority over the second device during a first data frame, determining whether the first device has data to transmit to the second device during the first data frame, transmitting, from the first device, a receive priority control signal during a receive priority control slot (Rxp) corresponding to the first data frame if the first device has the receive priority and no data to transmit, and transmitting, from the first device, a transmit priority control signal during a transmit priority control slot (Txp) corresponding to the first data frame if the first device has the transmit priority and data to transmit. | 06-14-2012 |
20120252510 | METHODS AND APPARATUS FOR ASSIGNING RESOURCES TO SCHEDULE PEER-TO-PEER COMMUNICATIONS IN WWAN - A method of operating a wireless device includes determining an energy on each of a plurality of resources for broadcasting CIDs, sending information to a base station based on the determined energy for each of the CIDs, and receiving a CID from the base station. The received CID is one of the CIDs determined based on the information. A method of wireless communication includes receiving first information about a first plurality of CIDs from a first wireless device, receiving second information about a second plurality of CIDs from a second wireless device, comparing the first information and the second information to determine a subset of CIDs based on the first plurality of CIDs and the second plurality of CIDs, selecting a CID based on the subset of CIDs, and sending the selected CID to at least one of the first wireless device or the second wireless device. | 10-04-2012 |
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 |
20130010774 | SYNCHRONOUS TRANSMISSION METHODS AND APPARATUS - Methods and apparatus for use in a wireless system are described where initiation of packet transmission is constrained in accordance to control actual packet transmission in a manner that reduces contention and possible collisions beyond that provided by lower layer resource contention mechanisms, e.g., 802.11 carrier sensing and/or transmission back-off timing mechanisms. Through higher level, e.g., MAC constraints, on packet transmission initiation, an air interface which employs carrier sensing can be used and controlled in a manner which reduces collisions and interference in applications where small packets, e.g., packets which can be transmitted in a fraction of the maximum permitted transmission time. The methods allow small packets in such systems to be transmitted on a periodic or semi-periodic basis in many cases. | 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 |
20130064089 | METHODS AND APPARATUS FOR TRAFFIC CONTENTION RESOURCE ALLOCATION - Methods and apparatus for allocating traffic contention resource units in a wireless communications system in which decisions are made in a distributed manner are described. A wireless communications device, corresponding to a link, self allocates resource units for traffic contention. Decisions regarding initially acquiring resources, relinquishing acquired resources, and/or acquiring additional resources for traffic contention are based on detected levels of network congestion and/or detected changes in network congestion. A wireless communications device detects a level of network congestion and determines a number of resource units to acquire for traffic contention based on the detected level of network congestion. | 03-14-2013 |
20130065621 | METHODS AND APPARATUS FOR ADAPTIVE PARTITIONING OF LINKS - Methods and apparatus for efficiently scheduling links in wireless communications networks are described. Various described methods and apparatus are well suited for use in ad hoc wireless networks in which scheduling decisions are made in a distributed and/or decentralized manner. In some embodiments, the links in a network, e.g., in a peer to peer ad hoc network, are adaptively grouped based on comparable link channel gain. Exemplary signaling used, in some but not necessarily all embodiments, by devices to estimate channel gains include broadcast connection identifier signals and reverse broadcast connection identifier signals. Grouping links into sets based on comparable link channel gain, and selectively ordering the scheduling priorities of the different groups, is used to improve scheduling efficiency, e.g., decrease the likelihood that unnecessary yielding occurs. | 03-14-2013 |
20130083699 | METHODS AND APPARATUS FOR DISTRIBUTED MEDIUM ACCESS IN WIRELESS PEER-TO-PEER NETWORKS - An apparatus, a method of the apparatus, and a computer program in the apparatus are provided in which the apparatus determines a group to which each of a plurality of wireless devices is associated based on signals received from the plurality of wireless devices. The apparatus selects a group for access to a wireless medium from a plurality of groups based on the group determined for each of the plurality of wireless devices and based on reducing interference with the plurality of wireless devices. Each of the plurality of groups has a different priority. The apparatus communicates using peer-to-peer communication on the wireless medium with a priority based on the selected group. | 04-04-2013 |
20130114424 | METHOD AND APPARATUS FOR TRANSMIT PRIORITY DETERMINATION WITHIN A LINK - A method, computer program product, and an apparatus for a transmit priority distributed backoff are provided. The apparatus forms a peer-to-peer communication link with a second apparatus. In addition, the apparatus determines whether to transmit in an assigned resource for securing a transmit priority for transfer of data to the second apparatus based on a quality of service estimation. Furthermore, the apparatus transmits to the second apparatus based on the determination. A method, computer program product, and an apparatus for a transmit priority token passing are provided. The apparatus forms a peer-to-peer communication link with a second apparatus. In addition, the apparatus determines a transmit priority within the link based on a quality of service estimation. The transmit priority is a priority of transmission between the apparatus and the second apparatus in the link. | 05-09-2013 |
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 |
20130182584 | Methods and apparatus relating to connection and/or session establishment decisions - Wireless communications devices with existing peer to peer links transmit, e.g., in accordance with a recurring schedule, quality of service related information corresponding to the existing links. The transmitted quality of service related information is, e.g., information indicating an obtained quality of service for the existing link. In some embodiments, quality of service related information is communicated in one of: a peer discovery signal, a connection ID broadcast signal and a contention resolution signal. A wireless communications device seeking to establish a new peer to peer link receives quality of service related information corresponding to existing links and estimates a quality a service achievable on the new desired potential link based on the received quality of service related information. The wireless communications device decides whether or not to establish the new peer to peer link based on its quality of service estimate. | 07-18-2013 |
20130195082 | METHOD AND APPARATUS FOR IMPROVING COEXISTENCE OF SYNCHRONOUS AND ASYNCHRONOUS NODES IN A SYNCHRONOUS MAC SYSTEM - A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be configured to determine a plurality of slots for transmitting information including a plurality of first type slots and a plurality of second type slots where the second type slots have a longer duration that the first type slots. The apparatus may be configured to transmit information in a first type slot when a previous reception was successful and there is no other transmission expected to occur during a gap preceding the first type slot and during the first type slot. Additionally or in the alternative, apparatus may be configured to transmit information in a second type slot when at least one of the previous reception was unsuccessful or there is another transmission expected to occur during a gap preceding the first type slot or during the first type slot. | 08-01-2013 |
20130272443 | METHODS AND APPARATUS TO IMPROVE CHANNEL ESTIMATION IN COMMUNICATION SYSTEMS - A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus generates a codeword, determines at least one puncture to the codeword based on allowing a legacy receiver to decode the codeword without knowledge of the at least one puncture, replaces each of the at least one puncture with a pilot, and transmits the codeword. The apparatus may also generate an IEEE 802.11 codeword having pilots in a first set of subcarriers, and puncture the codeword with additional pilots unknown to a legacy receiver in a second set of subcarriers. Accordingly, when an original set of pilot symbols is insufficient or inappropriately placed in a resource structure, a codeword may be transmitted with a new pilot structure capable of being decoded by legacy receivers not aware of the new pilot structure. | 10-17-2013 |
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 |
20140328241 | METHOD AND APPARATUS FOR EFFICIENT COMMUNICATION OF SAFETY MESSAGES FOR A GROUP OF USER EQUIPMENTS - A method, an apparatus, and a computer program product for wireless communication are provided in connection with communication of safety messages by a device on behalf of other devices in a group. In an example, a communications device is equipped to receive attribute information from one or more UEs in a group of UEs, generate group attribute information based on the received attribute information, and broadcast the group attribute information on behalf of the group of UEs. In such an aspect, the communications device is a member of the group of UEs, and the leader of the group of UEs. In another example, a communications device is equipped to transmit, by a UE, attribute information to a leader UE of a group of UEs, and prohibit broadcasting at least a portion of the attribute information. In such an aspect, the communications device is a member of the group of UEs. | 11-06-2014 |
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 |
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 |