Abstract:
It is determined whether a first kind of communication link, such as a high speed link, can be supported between a first unit and a second unit, wherein the first kind of communication link does not support a transmission range above a first maximum value. This is done by using a second kind of communication link, such as a low speed link, to determine a propagation loss value between the first unit and the second unit, wherein the second kind of communication link supports the transmission range above the first maximum value. Then, the propagation loss value is used to determine whether the firt kind of communication link can be supported between the firt unit and the second unit. The first and second units can be a master and slave in a piconet. Alternatively, they can both be slaves in a piconet.
Abstract:
Method and apparatus for dynamically selecting a packet type based on the quality estimates of the channel are disclosed. From these channel quality estimates, specific properties of the packet may be selected including whether a coding scheme should be used, the packet length, and the modulation used. The packet type selection is then performed in a dynamic fashion based on updates or changes to the channel conditions.
Abstract:
A single-carrier signal is generated from a number, N, of symbols in a way that results in a low PAPR. This includes generating an initial set of N complex frequency components from the N symbols. N
Abstract:
There is provided a method of operating a communication system, the communication system comprising a user equipment and a receiver, the method in the system comprising generating a random access transmission in a user equipment and transmitting the random access transmission to the receiver in the communication system, the random access transmission including a preamble; receiving the random access transmission from the user equipment at the receiver; processing the random access transmission in the frequency domain to detect the preamble. In preferred embodiments of the invention, the preamble has a cyclic prefix, or is preceded by a plurality of zero-valued symbols.
Abstract:
A dynamic carrier selection method and system permit units operating on a first carrier (0, 1, 2, 3, 75, 76) to change to a second carrier (0, 1, 2, 3, 75, 76) when performance of the first carrier (0, 1, 2, 3, 75, 76) becomes unacceptable. Carrier quality measurements are taken (503) in which carrier quality is a function of interference (I) and multi-path fading and carrier-signal strength (C). The carriers (0, 1, 2, 3, 75, 76) are ranked according to measured quality in a carrier candidate list. The carrier candidate list is used to permit units (403) to determine which carrier (0, 1, 2, 3, 75, 76) they should switch to (402) when the carrier (0, 1, 2, 3, 75, 76) they are currently operating on is determined to have unacceptable performance. Carrier measurements are retaken (503) in response to a carrier change by unit (403) or a predetermined time period having elapsed.
Abstract:
Un método de realización de un procedimiento de acceso aleatorio sobre una interfaz radio (106, 202), realizándose el método por un terminal móvil (102, 200) y comprendiendo los siguientes pasos: - transmitir (404) una petición de sincronización para una información de sincronización; - recibir (406) una información de sincronización en respuesta a la petición de sincronización; - transmitir (408), en base a al menos un parámetro de transmisión ajustado según la información de sincronización, una petición de recursos para los recursos de transmisión de datos e - iniciar un temporizador de sincronización en respuesta a al menos uno de la recepción de una información de sincronización y la transmisión de datos, en donde la expiración del temporizador de sincronización se ha fijado según una predicción de una validez de la información de sincronización.
Abstract:
A representative measurement indicating a relative oscillation speed of a reference clock during a representative calibration period is ascertained. Multiple calibration periods are defined including first and second calibration periods. The first calibration period begins at a first start time, wherein a first time offset value is equal to a difference between the first start time and a transition point of the reference clock signal within the first calibration period. The second calibration period begins at a second start time, wherein a second time offset value is equal to a difference between the second start time and a transition point of the reference clock signal within the second calibration period. The first and second time offset values are different from one another. Measurements are generated by, for each one of the calibration periods, measuring the speed of the reference clock. The measurements are then averaged.