Abstract:
PROBLEM TO BE SOLVED: To provide an access terminal for evaluating qualities of the available wireless broadcast channels that carry contents to be selected, and selects the best source of contents from among the available wireless broadcast channels, based upon the qualities. SOLUTION: An access terminal in a wireless multiple-access network monitors multiple broadcast soft handoff groups simultaneously in order to select the best logical broadcast channels to decode them based upon broadcast contents selected by a user of the access terminal. When an access terminal is in a traffic state, the access terminal decodes one or more broadcast channels by decoding a unicast channel from a traffic server during one time slot and then by decoding a broadcast channel from a broadcast server during another time slot. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for adaptive server selection in a wireless communication. SOLUTION: An access terminal may be configured to determine a forward link quality metric associated with each of a plurality of sectors serviced by a plurality of access points; assign credits to each sector in relation to the forward link quality metric; and change a data source control (DSC) value if the credits accumulated for a non-serving sector at a DSC change boundary is greater than a predetermined threshold, where the non-serving sector and the serving sector for the access terminal belong to different cells. The access terminal may be further configured to change a data rate control (DRC) cover in accordance with the DSC change. The use of DSC may provide an early indication of handoff, thereby allowing the service outage associated with server switching to be substantially reduced. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
Systems and techniques are disclosed relating to communications. The systems and techniques involve measuring a quality of a transmission from a remote location, identifying a data rate as a function of the measured quality, the identified data rate being capable of supporting a plurality of packet lengths, selecting one of the packet lengths as a function of a parameter of the measured quality, and providing feedback to the remote location, the feedback relating to the data rate and the selected one of the packet lengths. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
Abstract:
Method and apparatus for time or frequency synchronization of radio signals transmitted by user terminals in communication with a gateway through a satellite is provided. The satellite may be part of a non-synchronous satellite communication system, such as a low-earth orbit (LEO) satellite communication system for data, voice or video communications. Times of transmission of return link radio signals from the user terminals may be adjusted such that the signals arrive at the satellite or at the gateway without large time delay differentials. Carrier frequencies of return link radio signals transmitted from the user terminals may be adjusted such that the signals arrive at the satellite or at the gateway without large frequency offset differentials.
Abstract:
Un procedimiento (1100) de comunicación inalámbrica en un sistema de satélites en órbita no geosíncrona, NGSO, el procedimiento realizado por un terminal de usuario, UT, y que comprende: recibir (1101) datos para su transmisión a un controlador de red por medio de un satélite; recibir (1102), desde el controlador de red, una activación de recursos basados en contienda del sistema de satélites; transmitir (1106), durante un período de tiempo, una primera porción de los datos en una pluralidad de subtramas de los recursos basados en contienda antes de recibir una concesión de recursos de enlace de retorno planificados; y finalizar (1112) transmisiones de datos en los recursos basados en contienda después de que expire el período de tiempo o al recibir la concesión de recursos de enlace de retorno planificados durante el período de tiempo, independientemente de las colisiones en los recursos basados en contienda.
Abstract:
A communication satellite system provides for spectral efficient data transmissions by a gateway to multiple user terminals by way of a satellite. The gateway transmits multiple blocks in a single slot, each block intended for one of the user terminals, where each block is encoded and modulated according to a scheme that may be different for each intended user terminal. Upon re-transmission of a block if that block is lost or received in error, the block may be encoded and modulated according to another scheme that is less spectrally efficient than in the first transmission of the block.
Abstract:
Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.
Abstract:
Se describen técnicas para transmitir y recibir pilotos (señales de referencia) en una red inalámbrica. En un aspecto, toda la información puede transportarse de acuerdo con recursos específicos utilizados para enviar una señal, como por ejemplo, un piloto. Una función pseudo-aleatoria puede recibir la información para transportar mediante el piloto y posiblemente otra información y para proporcionar valores pseudo-aleatorios, que pueden utilizarse para seleccionar los recursos para utilizar para enviar el piloto. En un diseño con transmisor (por ejemplo una estación base para un sector) puede determinar primero la primera información (por ejemplo, una ID de sector) para transportar mediante un piloto y también puede determinar la segunda información para tiempo absoluto (por ejemplo, un índice de ciclo de piloto). El transmisor puede determinar recursos (por ejemplo, intervalos) usados para enviar el piloto de acuerdo con la primera y segunda información y posiblemente además de acuerdo con un desplazamiento de PN pseudo-aleatorio asignado al sector. El transmisor puede transmitir el piloto en los recursos determinados. La ID de sector puede recuperarse en un receptor de acuerdo con un índice de piloto y otra información.