Abstract:
PROBLEM TO BE SOLVED: To initiate a point-to-point call involving a wireless mobile station already receiving shared broadcast service. SOLUTION: A method is for managing a point-to-point call (702) initiated between a wireless mobile station and a remote third party while the mobile station receives broadcast content. The mobile station notifies (704) the network of preferences as to prescribed categories of operating conditions (such as whether to continue receiving the broadcast content, and selection between the point-to-point call and the broadcast content). In accordance with the preferences, communications are conducted (706) in one of the three following operating modes: (1) conducting the point-to-point call and discontinuing reception of the broadcast, (2) conducting the point-to-point call and continuing reception of the broadcast, (3) aborting completion of the point-to-point call and continuing reception of the broadcast. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a system for a handoff in a broadcast communication system. SOLUTION: A subscriber assisted handoff is impractical in a broadcast communication system due to a high signaling load and a difficulty to synchronize the broadcast transmission. On the other hand, the small number of broadcast channels enables a subscriber station to perform a handoff autonomously. To streamline an autonomous handoff decision process, several distinct sets of pilot identifiers and rules for transition among the sets are defined. To fully integrate broadcast services with services provided by the cellular telephone systems in a subscriber environment, methods for various handoff scenarios are analyzed. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a system for using an external decoder in a broadcast service communication system. SOLUTION: An external decoder and an internal decoder encode a block of information to be transmitted to add redundancy, thereby enhancing protection. The redundancy allows decoding of information from those less than a perfect encode block of information. As a result of this, a receiving station determines a time when a sufficient quantity of data are received to succeed in decoding; and implements other activities such as hard hand off on a broadcast channel, inter-frequency hard hand off and other activities by using a remaining time before the next block of information arrives. Instead, the receiving station is able to suspend reception, so that it is possible to reduce consumed power. Moreover, part of the information block may be used to transmit signaling information. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and system for multilevel scheduling for rate assignment in a communication system. SOLUTION: A method for estimating capacity used on a reverse link includes: measuring a plurality of signal-to-noise ratios at a station for a plurality of rates; determining sector load on the basis of the measured plurality of signal-to-noise ratios, an assigned transmission rate and an expected transmission rate; and estimating capacity on the reverse link on the basis of the sector load. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system capable of supporting so that a subscriber station can function in both a broadcast mode and a communication mode. SOLUTION: A method and a system for providing signaling in cellular telephone system providing broadcast services fully integrate broadcast services with the services provided by the cellular telephone systems. The signaling method coordinates interaction between an access network and the subscriber station to allow the subscriber station to decode the broadcast service to receive paging messages while receiving the broadcast service to properly transition between operation states, and other functions known to persons skilled in the art. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a novel and improved method and apparatus for generating a reduced peak amplitude high data rate channel comprising a set of lower rate channels. SOLUTION: There is provided an apparatus and a method for carrying out data transfer at a high data rate in a plurality of low data rate channel. The set of lower rate channels are phase, rotated before being summed and transmitted. The amount of phase rotation is dependent on the number of channels used to form the higher rate channel. In one embodiment where two lower rate channels are used, the in-phase and quadrature-phase components of the two channels are complex multiplied before upconversion with an in-phase and quadrature-phase sinusoids. For a high rate channel comprising more than two lower rate channels, the in-phase and quadrature-phase component of each channel is upconverted with a set of sinusoids that are phase offset from one another. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide transmission power control including transmission power control for a case that there is no transmission of voice and data. SOLUTION: A transmission power having a channel with an active portion and a silent portion is received. The received transmission power is controlled as a function of a parameter of the active portion of the channel during a first time period and independent of the parameter during a second time period. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for call recovery in a wireless communication system. SOLUTION: When the communication link between a mobile station 38 and a base station 32 is in trouble, the mobile station and the infrastructure prearrange a potential rescue base station 34. The source cell base station contacts all recovery-capable neighbors as potential rescuers. Each rescue base station is instructed to use a default channel for rescue transmissions. The rescue transmission is considered a call recovery operation. The mobile station establishes a soft hand-off with rescue base station, wherein the FL uses the default channel and an alternate channel. Once hand-off is complete, the rescue base station discontinues use of the default channel. In one embodiment, the source cell base station provides the mobile station with the list of recovery-capable neighbors as overhead during transmissions and prior to development of the communication link problem. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a reverse link channel structure in which data transmission characteristic in a reverse link has been taken into consideration. SOLUTION: Mechanisms are provided to quickly assign resources (e.g., a supplemental channel) as needed, and to quickly de-assign the resources when not needed or to maintain system stability. The reverse link resources may be quickly assigned or de-assigned by short messages exchanged on control channels on forward and reverse links. A reliable acknowledgment/negative acknowledgment scheme and an efficient retransmission scheme are provided. Mechanisms are also provided to control a transmission power and/or data rate of a remote terminal to achieve high performance and avoid instability. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for adjusting the time at which a mobile station performs searches for alternative systems, to which a hard hand-off will be conducted between different wireless communication systems. SOLUTION: A mobile station 5 receives a command which instructs the mobile station 5 on when to tune to alternative frequencies, in order to search for indications of the presence of an alternative system. The mobile station 5 tunes to alternative frequencies to perform searches only during predetermined times. In addition, the mobile station 5 coordinates the transmission of reports which indicate the results of searches for alternative systems, such that these reports are transmitted from the mobile station 5, when the mobile station 5 is to be tuned to the starting frequency. COPYRIGHT: (C)2007,JPO&INPIT