Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatus for an efficient two-stage paging wireless communication system.SOLUTION: Wireless terminals are assigned to paging groups. A few first paging message information bits are modulated (using asynchronous modulation) into a first paging signal and communicated from a base station to a wireless terminal. WT wakes up, receives the first paging signal and quickly checks whether its paging group should wait for a second paging signal. If so, the WT is operated to receive the second paging signal; otherwise, the WT goes back to sleep conserving power. The base station modulates several second message information bits (using synchronous modulation) and transmits signals to WTs. From the information in the first and second paging signals, a WT can determine that it is the paged WT and process the paging instructions. The intended paged WT can transmit a reception acknowledgement signal on a dedicated uplink resource.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for communicating transmission backlog information.SOLUTION: Reporting control factors are utilized to expand reporting possibilities for a fixed bit size request report. The report control factor is determined as a function of channel quality information, power information, device capability information, and/or quality of service information. A transmission backlog report value is interpreted as a function of a reporting control factor. A wide range of quantization schemes for reporting transmission backlog information are facilitated corresponding to a small bit size report. A communications device adaptively selects a quantization request level closely matched to its current needs such as to provide an accurate representation of its current traffic channel resource needs. A communications device may request the number of frames in a request report, and the same report may indirectly request the number of communications segments needed to clear its transmission backlog.
Abstract:
PROBLEM TO BE SOLVED: To provide systems and methodologies that facilitate scheduling best effort flows in broadband or wideband wireless communication networks.SOLUTION: The wireless systems can include devices and/or component that effectuate: associating utility functions to multiple disparate flows on the basis of traffic conditions extant in the wireless system; ascertaining the average rate at which the flow has been serviced in the past; and utilizing the utility function associated with the flow or the average rate that the flow has been serviced in the past to optimally schedule the flow.
Abstract:
PROBLEM TO BE SOLVED: To provide a multi-mode base station having a transmission standby mode that is a low power/low interference level of operation.SOLUTION: A multi-mode base station includes a transmission standby mode and an active mode. Transmission standby mode (1322) of base station operation is a low power/low interference level of operation as compared to active mode. In transmission standby mode at least some of the synchronization signaling such as pilot tone signaling is reduced in power level and/or rate with respect to the active mode. In the transmission standby mode, the base station may have some sleep state registered wireless terminals being serviced. Mode transitions (1320) from active to transmission standby may be in response to: a detected period of inactivity, scheduling information, base station mode change signals, and/or detected wireless terminal state transition. Mode transitions from transmission standby to active may be in response to: scheduling information, access signals, wake-up signals, hand-off signals, wireless terminal state change signals, and/or base station mode change signals.
Abstract:
PROBLEM TO BE SOLVED: To provide a multi-mode base station that supports a transmission standby mode and an active mode.SOLUTION: In the transmission standby mode at least some of the synchronization signaling such as pilot tone signaling is reduced in power level and/or rate with respect to the active mode. Mode transitions from active to transmission standby may be in response to: a detected period of inactivity, scheduling information, base station mode change signals, and/or detected wireless terminal state transition. Mode transitions from transmission standby to active may be in response to: scheduling information, access signals, wake-up signals from the wireless terminal, hand-off signals, etc.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for achieving transmit and/or receive diversity using multiple antennas.SOLUTION: A single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas 312. At any given time, a controllable switching module 310 couples the single transmitter chain to one of the plurality of transmit antennas. Over time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching determinations are based upon predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. Each of multiple transmitter chains is coupled to a different transmit antenna. Information to be transmitted is mapped to a plurality of tones.
Abstract:
PROBLEM TO BE SOLVED: To provide wireless terminal beacon signaling which achieves timing synchronization between two wireless terminals in a wireless communication system, e.g., in an ad hoc network lacking a centralized timing reference.SOLUTION: A timing structure used by an individual wireless terminal includes a beacon transmission time interval, a beacon monitoring time interval and a silence time interval. A first wireless terminal that monitors beacon signals from other wireless terminals detects a beacon signal portion from a second wireless terminal and determines a timing adjustment as a function of the detected beacon signal portion. The first wireless terminal applies the determined timing adjustment, e.g., time shifting of its timing structure, so that its beacon signal can be detected by the second wireless terminal. Implementation of the determined timing adjustment sets the timing structures of the two wireless terminals to have a fixed relationship, thereby allowing for coordinated communications including a peer-to-peer communications session.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for allowing a wireless terminal to achieve timing synchronization with a base station in uplink transmission of an access request signal.SOLUTION: A wireless terminal transmits first and second sets of tones over respective first and second contiguous transmission periods. The first and second tone sets are disjoint from each other and each comprises a number of contiguous tones. The terminal then refrains from transmitting during a third time period in order to receive a grant signal from a base station in response to an access request. The beginnings of the first time period and the second time period may be a function of a determined uplink transmission time.
Abstract:
PROBLEM TO BE SOLVED: To facilitate utilization of power-based rate signaling for uplink scheduling in a wireless communications system.SOLUTION: A maximum nominal power (e.g., relative maximum transmit power employed on an uplink) is known to both a base station and a mobile device. The base station and the mobile device agree upon the maximum nominal power. Signaling related to the maximum nominal power for utilization on the uplink is provided over a downlink. Selection of a code rate, modulation scheme, and the like for the uplink is effectuated by the mobile device as a function of the maximum nominal power. Moreover, such selection is based at least in part upon an interference cost evaluated by the mobile device.
Abstract:
PROBLEM TO BE SOLVED: To efficiently communicate backlog information, e.g., backlog information indicating the amount of uplink traffic waiting to be transmitted by a wireless terminal.SOLUTION: Delta backlog reports are used in addition to absolute backlog reports, thus reducing control signaling overhead. At least some information communicated in a delta backlog report refers to a previously transmitted backlog report. A base station uses backlog information received from wireless terminals in determining scheduling of uplink traffic channel segments.