Abstract: Noise variance estimation and interference detection is described. In one example, a method of estimating noise variance is described in which the pilots within a received OFDM signal are divided into bands and then a noise variance estimate is calculated on a per-band basis by averaging the noise estimates for those pilots within the band. In some examples, the pilots are divided into bands in frequency and in other examples, the pilots are divided into bands in frequency and time, such that noise estimates from more than one OFDM symbol are used in calculating the per-band noise variance estimates. The noise variance estimate for a pilot is then set to the noise variance estimate for the band which contains the pilot. The noise variance estimate for a data sub-carrier can then be determined by interpolating between the values for the pilots.

Abstract: Systems and methodologies are described that facilitate increased communication channel bandwidth efficiency in association with scheduled time periods that allocate channel access to particular stations. According to various aspects, systems and methods are described that facilitate providing and/or utilizing reverse direction grants in connection with scheduled channel access. Such systems and/or method can mitigate an amount of unused channel access time after a station completes data transmission prior to an end of the allocated period.

Abstract: An apparatus or method for transmitting data blocks on a communications channel having a radio link between two stations including a user equipment comprises receiving first data blocks from the user equipment, and transmitting second data blocks to the user equipment. A polling interval is dynamically set for the transmission of polling messages to the user equipment after transmission of the second data blocks, the polling interval being set in accordance with at least one of: a size of one or more data blocks received by the apparatus from the user equipment, a size of one or more blocks transmitted from the apparatus to the user equipment, and a service to which the user equipment is subscribed. The apparatus may be used as a PCU in a cellular mobile telephone system.

Abstract: A method and apparatus of allocating a resource for a plurality of logical channels is provided. A transmitter acquires a plurality of available resources for a plurality of component carriers, and allocates the plurality of available resources to the plurality of logical channels based on priority of each of the plurality of logical channels.

Abstract: A method of mitigating interference in a mobile wireless communication device by adaptively adjusting transmit power levels of a wireless cellular transceiver. A receive signal quality for a wireless non-cellular transceiver that includes interference from signals transmitted by the wireless cellular transceiver is estimated. The wireless non-cellular and wireless cellular transceivers are co-located in the mobile wireless communication device, and both transceivers are active. An actual transmit power of the wireless cellular transceiver is adjusted based on the estimated receive signal quality to a level less than a requested transmit power. The estimation of the receive signal quality and the adjusting of the actual transmit power is periodically repeated. The estimation accounts for operational properties of the wireless cellular and non-cellular transceivers as well as operational characteristics of wireless connections through the transceivers.

Abstract: Described herein are techniques related to data communications using a data packet having at least one frame with a robust preamble for use over media having a high degree of non-stationary noise (e.g., impulsive noise). The described techniques employ a preamble with a structure having multiple transitions between the preamble sections. Each transition indicates the start of the upcoming frame. With the techniques described herein, if noise damages the transitions between such sections beyond recognition, the receiver can still determine the frame start time from the one or more of the undamaged transitions. Thus, the robustness of communications via the noisy media is significantly increased.

Abstract: The present invention relates to a method for detecting closed subscriber group (CSG) cells through a terminal in a wireless communication system. The method for detecting the CSG cells in the wireless communication system comprises the steps of: determining a present position of the terminal; measuring a physical layer identifier of a corresponding cell when the present position of the terminal corresponds to a position of a prestored CSG cell; and detecting the corresponding cell as the priorly connected CSG cell when the measured physical layer identifier corresponds to the physical layer identifier of the prestored CSG cell. Desirably, the method further comprises the steps of measuring system information of the corresponding cell; and detecting the corresponding cell as the priorly connected CSG cell when the upper layer cell identifier included in the system information corresponds to the upper layer cell identifier of the prestored CSG cell.

Abstract: A receiver receives frequency division multiplexing transmission signals of multiple carriers, and includes a difference detection unit, an integration unit, a noise detection unit, a selection unit, and a correction unit. The difference detection unit calculates a difference that is representative of the amount of noise in the frequency division multiplexing transmission signals. The integration unit integrates for each frequency of the multiple carriers the difference output of the difference detection unit. The noise detection unit determines whether or not impulse noise is present in the input signal. When impulse noise is present, the selection unit supplies the integrator output to the correction unit. When impulse noise is not present, the selection unit supplies the calculated difference output to the correction unit.

Abstract: In accordance with at least some embodiments, a system comprises an access point and a station in communication with the access point. The station has at least two network technology subsystems subject to coexistence interference. The station selectively implements bounded Power Save (PS)-Polling (BPS) logic to handle communications between the station and the access point. The BPS logic operates to confine PS-Poll transmissions starts to one of two separate windows during a medium grant duration of the station.

Abstract: A relay node is operated in a communication system wherein the relay node communicates with a communication system node via a first link and communicates with user equipment (UE) via a second link. The relay node detects whether a collision between its own uplink transmission on the first link and receipt of the user's transmission on the second link at a future time instant is expected to occur, wherein the collision will interfere with the relay node's ability to receive the UE's transmission. If so, then, the relay node selects and executes one of a plurality of interference averting measures, selection being based at least in part on what type of information is expected to be transmitted and received on the respective first and second links. First and second interference averting measures comprise refraining from or proceeding with transmission of some information to the communication system node.

Abstract: A method and apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed are disclosed. A sequence may be generated from a temporary flow identity (TFI) to which the PAN field is addressed and masked with a PAN check sequence (PCS). A radio block including a PAN field and a masked PCS is transmitted. The PCS may be masked with one of TFIs which is selected in accordance with a rule pre-agreed. A secondary identifier may indicate a TBF to which the PAN field is addressed. A special value may be used to represent all TBFs assigned and a secondary identifier may indicate a TBF to which the PAN field is addressed. A special value on the PAN field may be used for control purposes for indicating an action affecting a group of receiving stations listening to the radio block.

Abstract: Enhancements are provided for the radio link control (RLC) protocol in wireless communication systems where variable RLC packet data unit (PDU) size is allowed. When flexible RLC PDU sizes are configured by upper layers, radio network controller (RNC)/Node B flow control, RLC flow control, status reporting and polling mechanisms are configured to use byte count based metrics in order to prevent possible buffer underflows in the Node B and buffer overflows in the RNC. The enhancements proposed herein for the RLC apply to both uplink and downlink communications.

Abstract: A method of providing synchronization-free station locating in a wireless network is provided. In this method, an AP having a known location sends a unicast packet to the station and notes its time of departure TOD(D). The station receives the unicast packet, notes its time of arrival TOA(D), sends an acknowledgement packet to the AP, and notes its time of departure TOD(D_ACK). The AP receives the acknowledgment packet and notes its time of arrival TOA(D_ACK). Notably, a distance between the AP and the station can be accurately determined using a first difference between the TOA(D_ACK) and the TOD(D) and a second difference between the TOD(D_ACK) and the TOA(D). A plurality of such computed distances between a plurality of APs and the station can be used to determine an accurate location of the station.

Abstract: A communication-management method involves a recurring polling scheme, wherein network nodes are polled by a base station according to optimized and/or user-preferred polling intervals assigned to each network node. The polling interval assigned to a given node may be optimized to minimize and/or achieve user-preferred thresholds for energy consumption and latency associated with each network node in the sensor network. Optimized and/or user-preferred polling intervals may be constrained in accordance with various network performance considerations, for example, a recommended update interval for each network node, characteristics of the network nodes themselves, the duration of the timselots at which the network nodes are polled, and/or other network performance considerations.

Abstract: Disclosed are devices and methods of a communication device including initiating an initial communication via a modem in response to a data pull communication event or a data push communication event and determining by the controller a measured network condition associated with transmitting the initial communication as well as determining by the controller the power consumption of the initial communication based on a measured network condition value processed by monitoring the modem. Methods of a communication device further include comparing the power consumption value with a predetermined power consumption value stored in the memory related to a predetermined acceptable measured network condition value for this type of communication event, and terminating by the controller, the communication when the power consumption value exceeds the predetermined power consumption value based upon the acceptable measured network condition value for this type of communication event.

Abstract: A system and method is provided for incorporating host-device communication in wireless IJSB (WUSB). A host (101) either uses a multicast Distributed Reservation Protocol (DRP) frame on behalf of connected devices (102) to reserve wireless channel resources, a unicast DRP frame or Enhanced Distributed Channel Access (EDCA) with a Poll Frame. In the case of a unicast DRP frame the number of unicast frames sent for reservation depends on the number of connected devices (102).

Abstract: A customer-premises equipment (CPE) communicates with an element management system (EMS) via a base station (BS) includes a signal transceiver unit and a signal processing unit. The signal transceiver unit transmits predetermined request information to the EMS. The signal processing unit determines a maximum sustained rate (MSR) of an extended real-time polling service (ERTPS) flow according to the request information. The signal processing unit determines whether or not the MSR enables support multiway calls, if the MSR cannot support multiway calls, the signal processing unit creates a quality o service (QoS) flow as an OFOC mode. If the MSR enables the multiway calls, the signal processing unit compares load values of the BS with a threshold value, and sets the QoS flow to the OFOC mode or to an OFAC mode according to the comparison.

Abstract: A system and method of operating a wireless network having a plurality of nodes. Each node determines whether to replace the beacon node. When a node determines that the beacon node is to be replaced, the node determines whether it should nominate itself as a potential replacement beacon node. The decision whether to nominate itself as a potential replacement beacon node is a function of a nomination probability associated with the node. If the node determines that it should nominate itself as a potential replacement beacon node, the node sends out one or more beacon signals. Each node then adaptively modifies the probability of nominating itself as a function of the number of beacon signals received from other nodes. Beacon signals are received by potential replacement nodes and, if the potential replacement beacon node has received a beacon signal from a higher ranking potential replacement beacon node, the node removes itself as a candidate for the replacement beacon node.

Abstract: Systems, apparatuses, and techniques relating to wireless local area network devices are described. A described technique includes transmitting a sounding packet to a wireless communication device(s) to determine characteristics of spatial wireless channels, the sounding packet being based on a spatial mapping matrix; receiving a feedback packet(s) from the device(s), the feedback packet(s) being indicative of one or more feedback matrices, the one or more feedback matrices being derived from wireless channel estimations that are based on received versions of the sounding packet; generating spatially steered data packets based on multiple data streams and one or more steering matrices, which are based on the spatial mapping matrix and the one or more feedback matrices; and transmitting a frame that includes the spatially steered data packets to the device(s).

Abstract: A method of performing a polling procedure in a wireless communication system is disclosed. In a method of performing polling procedure in a protocol layer in a wireless communication system, wherein the protocol layer performs a data retransmission function, the method comprises triggering a polling procedure to request a receiving side to transmit a status report, and terminating the triggered polling procedure if a predetermined event occurs.

Abstract: An apparatus and method for Automatic Repeat reQuest (ARQ) feedback polling in a wireless communication system are provided. The method for ARQ feedback polling includes transmitting at least one ARQ block to a receive end, polling ARQ feedback to the receive end using an extended header, determining if ARQ feedback information is received from the receive end within a lifetime of ARQ feedback, determining success or failure of transmission of the at least one ARQ block through the ARQ feedback information if it is determined that the ARQ feedback information is received within the lifetime of ARQ feedback, and polling ARQ feedback again to the receive end if it is determined that the ARQ feedback information is not received within the lifetime of ARQ feedback.

Abstract: The application relates to a method for configuring ports of radio equipments connected to an internal network of a base station of a mobile communications network. The application also relates to the corresponding radio equipment and the corresponding radio equipment controller The method comprises: activating at least one port of the radio equipment to become an activated port, changing the activated at least one port to a non-connected slave state in which the activated at least one port listens to a communication on a link of the internal network for a time period, upon detection of the communication on the link changing the activated at least one port to a connected slave state, or upon expiry of the time period changing the activated at least one port to a non-connected master state in which the activated at least one port actively sends data into the link of the internal network.

Abstract: A computer implemented method selects antennas in a multiple-input, multiple-output wireless local area network that includes multiple stations, and each station includes a set of antennas. Multiple consecutively transmitted sounding packets are received in a station. Each sounding packet corresponds to a different subset of the set of antennas. A channel matrix is estimated from the multiple consecutively transmitted sounding packets, and a subset of antennas is selected according to the channel matrix.

Abstract: A telecommunication device configured to perform at least one of adjusting a network polling frequency, prompting a user to select one of a plurality of networks, automatically connecting to one of the networks, or automatically disconnecting from one of the networks is described herein. The telecommunication device performs the adjusting, prompting, or connecting based at least on received device data or network data that is associated with the networks.

Abstract: Embodiments of a central controller and methods for interference mitigation in TDMA networks are generally described herein. In some embodiments, the central controller mitigates co-channel interference by randomizing locations of channel time allocations within superframes.

Abstract: An apparatus or method for transmitting data blocks on a communications channel having a radio link between two stations including a user equipment comprises receiving first data blocks from the user equipment, and transmitting second data blocks to the user equipment. A polling interval is dynamically set for the transmission of polling messages to the user equipment after transmission of the second data blocks, the polling interval being set in accordance with at least one of: a size of one or more data blocks received by the apparatus from the user equipment, a size of one or more blocks transmitted from the apparatus to the user equipment, and a service to which the user equipment is subscribed. The apparatus may be used as a PCU in a cellular mobile telephone system.

Abstract: Enhancements are provided for the radio link control (RLC) protocol in wireless communication systems where variable RLC packet data unit (PDU) size is allowed. When flexible RLC PDU sizes are configured by upper layers, radio network controller (RNC)/Node B flow control, RLC flow control, status reporting and polling mechanisms are configured to use byte count based metrics in order to prevent possible buffer underflows in the Node B and buffer overflows in the RNC. The enhancements proposed herein for the RLC apply to both uplink and downlink communications.

Abstract: A technique for combining transmission bandwidths of several mobile stations (MS1, MS2) is disclosed. A master mobile station (MS1) establishes (7-0) a WLAN base station communicating with WLAN client terminals (CT). One or more slave mobile stations (MS2) may detect a predefined network identifier and join the WLAN network. The master (MS1) assigns IP addresses for the client terminals (CT) and slave mobile stations (MS2). The master also resolves DNS queries in cooperation with external DNS servers. Traffic, including internet packets (IP1-IP4), between the client terminals and various internet hosts (HO) is tunneled over multiple simultaneous transmission paths between the master (MS1) and a multiplexing/demultiplexing computer (SM). The inventive bandwidth combination technique is transparent to the client terminals (CT) and the internet hosts (HO).

Abstract: A method of transmitting a data block at a transmitting side in a wireless communication system is disclosed. The present invention generates a data block including polling information but no upper layer data, the polling information requesting a transmission of acknowledgement information (status report) on at least one data block transmitted to a receiving side and then transmits the data block to the receiving side, thereby it is possible to raise efficiency in wireless transmission.

Abstract: A method of establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the method comprising combining tree search and Aloha methods to establish communications between the interrogator and individual ones of the multiple wireless identification devices without collision. A system comprising an interrogator, and a plurality of wireless identification devices configured to communicate with the interrogator. In a wireless fashion, the respective wireless identification devices having a unique identification number, the interrogator being configured to employ tree search and Aloha techniques to determine the unique identification numbers of the different wireless identification devices so as to be able to establish communications between the interrogator identification and individual devices without ones of the multiple wireless collision by multiple wireless identification devices attempting to respond to the interrogator at the same time.

Abstract: Systems and methods for allocating and transmitting uplink data block transmissions with piggy-backed ACK/NACK bitmap field are provided. The systems and methods involve using a request for a DBCCI (Data Block Combined with Control Information) to allocate a timeslot for data transmission. A UADB (uplink allocation for data block) is not also used to allocate the timeslot.

Abstract: A wireless network device in a wireless network that includes a plurality of wireless network devices comprises n RF transceiver that transmits and receives data packets and that periodically transmits or receives a beacon. A control module communicates with the RF transceiver, determines a group identifier and a station identifier based on the beacon, and selects one of a default IFS time and a second IFS time based on a data packet received.

Abstract: Methods include those by which nodes in a Frequency Hopping Spread Spectrum (FHSS) wireless network may be flexibly configured for beacon transmission and reception. The method may allow for any node to synchronize to any other node's given frequency to receive one or more beacon (broadcast) packets from that node at the designated period. The method may include sending, by a first node, a message to one or more neighbor nodes and responding, by the one or more neighbor nodes, with a message to the first node, the response message including a beacon frequency, a beacon transmit time and information about the current hopping sequence. The first node periodically programs its receiver to the beacon frequency at the beacon transmit time and uses the hopping sequence to receive information including at least one of routing information and timing updates for hopping channel synchronization from the one or more neighbor nodes.

Abstract: A system for transmitting data directly between a plurality of client network devices in a network having an Access Point (“AP”) device separate from the plurality of client network devices is disclosed. The system may include a first client network device having a first client (“STA”) module and a second client network device of the plurality of client network devices.

Abstract: A method and apparatus for adaptively obtaining bandwidth requests in a broadband wireless communication system. The method and apparatus includes dynamically varying technique combinations enabling a plurality of users to efficiently request bandwidth from a shared base station. A user may “piggyback” a new bandwidth request upon, or set a “poll-me bit” within, presently allocated bandwidth. A base station may poll users, individually or in groups, by allocating unrequested bandwidth for new requests. Polling may respond to a “poll-me bit,” and/or it may be adaptively periodic at a rate based on communication status parameters, such as recent communication activity and connection QoS levels Group polling permits a possibility of collisions. Polling policies may be established for dynamically varying user groups, or may be determined for each user. Dynamic selection of appropriate polling techniques makes use of efficiency benefits associated with each technique.

Abstract: A method and apparatus for adaptively obtaining bandwidth requests in a broadband wireless communication system. The method and apparatus includes dynamically varying technique combinations enabling a plurality of users to efficiently request bandwidth from a shared base station. A user may “piggyback” a new bandwidth request upon, or set a “poll-me bit” within, presently allocated bandwidth. A base station may poll users, individually or in groups, by allocating unrequested bandwidth for new requests. Polling may respond to a “poll-me bit,” and/or it may be adaptively periodic at a rate based on communication status parameters, such as recent communication activity and connection QoS levels. Group polling permits a possibility of collisions. Polling policies may be established for dynamically varying user groups, or may be determined for each user. Dynamic selection of appropriate polling techniques makes use of efficiency benefits associated with each technique.

Abstract: Briefly, a wireless communication device that includes a processor to enable a determined number of receivers of a MIMO system according to a value provided with a request to enable the receivers is provided. A method for enabling the receivers of MIMO system is also provided.

Abstract: The present invention is directed to systems and method for attenuating intermodulation interference. In particular, methods and systems to attenuate intermodulation interference contained within an aggregate signal having a transmitted signal that was transmitted over a communications channel having channel effects that produce the intermodulation interference are provided. The communications channel may be a cable television distribution network and the signal may be a cable television signal. A method is provided to predict when intermodulation interference will be large, so that actions within a receiver can be taken to reduce the impact of the interference and improve overall receiver performance.

Abstract: A method and system operable to implement a multiple range, and optionally one-dimensional, transport scheduling process suitable to facilitate signal transport over a network for a variety of traffic types with different service requirements where two-dimensional mapping across frequency and/or time is required.

Abstract: A method of operating a Base Station (BS) in a broadband wireless communication system to resume an extended real-time Polling Service (ertPS) is provided. The method of operating the BS includes detecting a codeword received through a Channel Quality Indicator (CQI) channel, and upon receiving a CQI CHannel (CQICH) codeword for requesting resumption of an extended real-time Polling Service (ertPS) connection from a Mobile Station (MS), allocating to the MS an uplink resource corresponding to the largest maximum sustainable traffic rate of at least one ertPS connec established to the MS.

Abstract: Methods and systems are provided to collect and update data on client devices connected to WiFi access points is provided. An inventory of WiFi cable modems and WiFi access points coupled to the WiFi cabled modems within a specific network is periodically collected. Internet Protocol (IP) addresses of WiFi cable modems and WiFi access points coupled to the WiFi cabled modems are periodically updated. Traps are periodically received from the WiFi access points. The traps are parsed to collect an inventory of client devices wirelessly connected to the WiFi access points and a time at which a client device connected to the WiFi access point. The WiFi access points are periodically polled to collect data on client devices, the data including a period of time that a client device has been connected to a WiFi access point and a physical location of the client device.

Abstract: A wireless network avoids delays in receiving status reports by having transmitters make sure that any outstanding Hybrid Automatic Repeat-reQuest (HARQ) processes in progress are all finished before sending the polling request. Thus, the receiver can respond to any polling request of the transmitter immediately without delay. Since the transmitter already ensures all HARQ processes are done, the receiver's status report will accurately reflect the latest information. The transmitter may send a poll anytime regardless of the HARQ processes if the most up-to-date polling is determined to be not as important (e.g., when the transmitter is trying to advance its transmitter window, in which case the exact Status info is not critical). The receiver may then react immediate upon receiving the poll. Thereby, detecting the loss of any piece of data within a data burst is expedited.

Abstract: Improved techniques for interacting with one or more handheld carriers hosting media content are disclosed. The handheld carrier hosting media content may be sensed, and at least a portion of the media content may be integrated into operation of a media activity provided by a computing device, upon recognizing the media activity and the media content. The media activity provided by the computing device may involve creating or editing an electronic document. The integration of the media content into operation of the media activity may involve insertion or importation of the media content into the electronic document.

Abstract: A data communication system includes an access point and a plurality of stations each for exchanging wireless data communication messages with the access point. At least some of the messages are in a format that includes at least one message header and a plurality of data units. Each of the data units includes a respective data unit header and a respective data frame. Each data unit header identifies a respective one of the stations as a recipient to receive the respective data frame of the data unit.

Abstract: Autonomous fractional time reuse is provided. In some embodiments, autonomous fractional time reuse includes determining a number of neighboring base stations of a base station in a heterogeneous network; and pseudo randomly selecting one or more Fractional Time Reuse (FTR) slots for transmission by the base station. In some embodiments, the one or more FTR slots are autonomously selected by the base station without coordinating the selection of the one or more FTR slots with one or more of the neighboring base stations.

Abstract: Systems, devices, and methods for retransmitting protocol data units in wireless communication are provided. In one aspect, a device configured to communicate via a wireless communication link includes a processor. The processor is configured to transmit a plurality of protocol data units (PDUs) to a receiving device, select a first PDU from a set of PDUs that has not been acknowledged by the receiving device, retransmit the first selected PDU with a first poll indicator, select a second PDU from the set, and retransmit the second selected PDU with a second poll indicator. The second PDU is different than the first PDU. In some aspects, the PDUs are selected based on the PDUs' original transmission time. In other aspects, the PDUs may be selected based on the PDU's most recent transmission time.

Abstract: A communication system comprising one or more wireless stations programmed to await for an authorizing signal to initiate wireless communications with a network controller or access point. The network controller maintains identification information in different queues, said queues based upon the wireless station's activity. The wireless station identification information is moved between the different queues in response to wireless station activity. Between polling, each mobile station aggregates data for the next opportunity to transmit. Multi-polling may be employed such that more than a single station is polled at a time. Polling is accomplished by polling one of the more active station along with a less active station. The less active station is unlikely to transmit, so collisions are avoided to a certain degree. If a lesser active station becomes active, it is moved into the more active queue and consequently will be polled more often.

Abstract: An apparatus for controlling Quality of Service (QoS) of a master Bluetooth® terminal in a piconet. A file-specific band setting unit sets information about files and information about bandwidths set for the files, which are stored in the master Bluetooth® terminal, for a content meta database. A QoS controller checks the content meta database when an arbitrary slave Bluetooth® terminal requests file download service, and provides the set bandwidth information of the corresponding file. A balancing Bluetooth® Network Encapsulation Protocol (BNEP) creates a virtual interface when the slave Bluetooth® terminal is accessed, and sets a bandwidth of the virtual interface, which is set for the slave Bluetooth® terminal requesting the download service, to a bandwidth of the corresponding file when the set bandwidth information of the file for which the download service is requested is received from the QoS controller, and provides the download service to the slave Bluetooth® terminal.

Abstract: Apparatus and methods for power control for mitigation or control of interference in a wireless communications environment. Control techniques can consider the effect of interference on an access point and the access point can identify interfering wireless terminals and cause a message to be sent to a controlling access point of the interfering wireless terminal to cause the uplink power of the interfering wireless terminal to be adjusted.

Abstract: Disclosed are methods and systems for modifying a data-synchronization interval for an access terminal based on a number of access terminals being served by a wireless access point in a coverage area. In at least one embodiment, an access terminal periodically polls at least one network device via the access point for synchronization data according to a first data-synchronization interval. The access terminal receives from the access point information indicative of a number of access terminals being served by the access point in the coverage area. The access terminal determines a second data-synchronization interval based at least in part on a comparison of the number to a threshold value. Subsequent to determining the second data-synchronization interval, the access terminal periodically polls the at least one network device for synchronization data according to the second data-synchronization interval.