Abstract:
A mobile station (402) selects (1802) a preferred cell site for transmitting a frame of data to be sent subsequently to the mobile station. A base station (602) of the preferred cell site schedules (1804) a transmission of the frame of data, wherein parameters for the transmission are determined by the base station from recently-measured channel and interference information. Thereafter, the base station sends (1806) the frame of data from the preferred cell site; and an active set of base stations associated with the mobile station at ones of a plurality of cell sites synchronize (1808) their data queues to reflect the transmission of the frame of data.
Abstract:
A communication system (100) that includes a base unit (101) and a subscriber unit (e.g., 103) employs a method (400) and apparatus (101) for mitigating interference (135) therein. The base unit (101) receives an uplink communication signal from the subscriber unit (103) at an uplink frequency and conveys a downlink communication signal to the subscriber unit (103) at a downlink frequency. Upon receiving (403) an uplink communication signal from the subscriber unit (103), the base unit (101) determines (405) a quality metric for the uplink frequency. When the quality metric is below a quality threshold (407), the base unit (101) and the subscriber unit (103) transfer (415) the communication signal to an alternate uplink frequency, while the downlink frequency remains unchanged.
Abstract:
Un método para comunicaciones facilitadas por un repetidor, que comprende: en un sitio de base: determinar una necesidad de recibir una transmisión inalámbrica desde un transmisor que está actualmente dentro del alcance de comunicaciones inalámbricas del sitio de base que solicita la asignación de un recurso de comunicación; determinar de manera automática si asignar un recurso de repetidor inalámbrico para con ello intentar al menos aumentar una calidad de servicio para soportar la transmisión inalámbrica desde el transmisor; proporcionar una instrucción al recurso de repetidor inalámbrico que comprende información de identificación de canal para recibir la transmisión desde el transmisor y un parámetro de transmisión que esperar cuando se recibe la transmisión desde el transmisor; y proporcionar una instrucción al recurso de repetidor inalámbrico para hacer que el recurso de repetidor inalámbrico repita al menos porciones de la transmisión inalámbrica desde el transmisor, donde la instrucción comprende proporcionar al menos información identificativa relativa al transmisor.
Abstract:
A communication system includes a forward link from a base station to multiple mobile units, the forward link having multiple shared channels (SHCH's), multiple shared control channels (SHCCH's), and multiple dedicated pointer control channels (DPTRCH's), and utilizes HARQ error control for error detection and error correction. The mobile unit, when listening to the DPTRCH, uses a SHCCH pointed to by the DPTRCH to demodulate and decode data on the SHCH. Throughput problems may arise in the system when the mobile unit combines and decodes the wrong SHCH data, that is, SHCH data that is intended for a different mobile unit, or may incorrectly decodes SHCH data that is intended for the mobile unit. In order to improve the data throughput of the system, the systems employs a flush test and an energy detector test to prevent improperly decoded data blocks from corrupting properly decoded data blocks.
Abstract:
The invention relates to a group application for group formation and management, in particular in a wireless environment. The present invention provides a group application in which a membership list of a group is kept updated automatically by communications between the group applications of the group. The group application handles all the complexity involved in setting up a group and maintaining a membership list for the group, without user intervention. Advantageously, the group application is implemented as a software agent. The invention also relates to an electronic device having a group application or software agent of the invention loaded therein.
Abstract:
A mobile station (402) selects (1802) a preferred cell site for transmitting a frame of data to be sent subsequently to the mobile station. A base station (602) of the preferred cell site schedules (1804) a transmission of the frame of data, wherein parameters for the transmission are determined by the base station from recently-measured channel and interference information. Thereafter, the base station sends (1806) the frame of data from the preferred cell site; and an active set of base stations associated with the mobile station at ones of a plurality of cell sites synchronize (1808) their data queues to reflect the transmission of the frame of data.
Abstract:
The invention provides a method for operating a hybrid automatic repeat request communication system wherein it is determined whether a receiver can process a data packet, and a self-decode request associated with the data packet is sent based on the determination.
Abstract:
This invention relates to a packet scheduler and method therefor and in particular a scheduler for a Code Division Multiple Access cellular mobile communication system. In packet base systems it is important to schedule transmissions of packets carefully in order to maximise the capacity of the system. The scheduler has means (235) for maintaining a list of packets for a cluster of cells. A packet is selected from this list and processed in means (237) for calculating an increase in receive power level at a target base station and at other base stations caused by transmitting a packet. The results are fed to means (239) for scheduling packets to a base station so that only packets which do not result in an accumulated receive power level exceeding a maximum receive power level at a base station are scheduled. The scheduler is in particular appropriate for third generation mobile communication systems.
Abstract:
A transceiver compatible with both wide channel constant envelope 4 level FSK FM modulation and narrow channel pi /4 differential QPSK linear modulation allows compatible interaction between modified constant envelope and non-constant envelope transmitters. All Nyquist filtering occurs in the transmitters, and none in the receiver.
Abstract:
A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a remote site (200, 500) via the channel (300, 600). The prime site includes a clock for providing a first value, T1, based on the current time at the prime site. The remote site includes a clock for providing a second value, T2, based on the current time at the remote site. Both clocks are synchronized with a common timing source, such as a GPS satellite timing signal. Therefore, T2 equals T1. In one embodiment, the prime site determines T1, and simultaneously sends a message to the remote site via the channel, the message including T1. Upon receiving the message, the remote site simultaneously determines T2. The remote site decodes the message to determine T1, and then determines the delay based on the difference between T2 and T1.