摘要:
Data is transmitted from a radio communication device (100) by selecting a signal dependent on data to be transmitted, transmitting to a radio communication station (200) the selected signal as a random access transmission, deriving an identifier dependent on the data, and employing the identifier to identify a subsequently received signal intended for the radio communication device (100). The data is received at a radio communication station (200) by receiving the random access signal which is indicative of the data to be received, determining the data indicated by the random access signal, deriving an identifier dependent on the determined data, and including the identifier in a subsequent transmission from the radio communication station (200) to identify the intended recipient of the subsequent transmission.
摘要:
A radio communication system comprises a secondary station having a communication channel with a primary station for the transmission of data packets from the primary station to the secondary station. In response to receipt of a data packet, the secondary station transmits a combined acknowledgement and quality parameter signal (402) to the primary station. The signal (402) indicates whether the data packet was received correctly and the value of the quality parameter enables the primary station to select transmission parameters for further data transmissions. A range of formats for the combined signal are possible.In one embodiment the quality parameter is a site selection signal indicating a preferred subset of primary stations for subsequent data transmissions. In another embodiment the quality parameter relates to the quality of the radio link and enables the primary station to select suitable modulation and coding schemes and/or transmit power levels.
摘要:
A radio communication system comprises a primary station adapted to transmit a series of data packets on a downlink channel to a secondary station. The primary station determines a property relating to the Doppler spread of the downlink channel and uses this property in the determination of suitable parameters for packet transmission. Possible properties from which an indication of the Doppler spread can be derived include the received signal to interference ratio and the transmitted power control commands. Possible parameters for packet transmission include transmission power, modulation and coding scheme, delay before retransmission of a packet received in error, and spreading factor.By determining packet transmission parameters based on uplink signal properties or on transmitted power control commands, the need for the secondary station to measure radio channel properties and signal these to the primary station is removed, thereby reducing signalling traffic and overall interference levels and extending battery life.
摘要:
A radio communication system comprises a primary station (100) for transmitting information signals on a downlink channel (122) and for receiving signals from one or more secondary stations (110) on an uplink random access packet channel (RACH) (124), the downlink and uplink channels being independent of each other. Power control is applied to the transmitted downlink signals by at least one of the secondary stations transmitting indicia indicating the prevailing radio channel characteristics of the uplink channel, the indicia being used by the primary station to apply power control to the downlink signals.If the uplink signals are CDMA signals the indicia may comprise a timing offset which has a value related to the quantity to be signalled.
摘要:
A radio communication system comprising a primary station and a plurality of secondary stations has a communication channel for the transmission of information from a secondary station to the primary station. The secondary station can adjust its output transmission power at a plurality of different rates, and the primary station can instruct the secondary station which of the plurality of rates it should use.The primary station determines the optimum rate for the secondary station to use by measurement of characteristics of signals received from the secondary station, for example the average signal to interference ratio, and instructs the secondary station accordingly. Other indication may be used to determine or verify the optimum rate, for example further properties of the received signals or information on the speed of the secondary station.
摘要:
The present invention relates to a method for requesting access to a resource,said method comprising a secondary station transmitting an access preamble to a primary station,upon failure of correct transmission of the access preamble, the secondary station starting a first power ramping scheme for transmitting the access preamble,upon failure of correct transmission of the access preamble with the first power ramping scheme, the secondary station transmitting a second access preamble with a second power ramping scheme being different from the first power ramping scheme.
摘要:
The present invention relates to a method for communicating between a primary station and a secondary station comprising (a) at the secondary station, upon arrival of a data packet to be transmitted to the primary station, buffering said data packet in a buffer, (b) at the secondary station, after the expiration of a time period starting at arrival of the data packet, transmitting to the primary station a request for an uplink transmission resource if a grant of uplink transmission resource is not received during the said time period, (c) at the primary station, granting to the secondary station an uplink transmission resource.
摘要:
A method is provided of transmitting a plurality of signals from a primary station to a respective plurality of secondary stations, said primary station comprising at least two transmit antennas, wherein each of said plurality of signals is transmitted from a respective subset of said at least two transmit antennas to a respective secondary station, in which each subset is selected at least according to a predetermined characteristic of the respective secondary station.
摘要:
Apparatus and method for encoding and transmitting feedback information from a first network node to a second network node in a multi-carrier wireless telecommunications network. The first network node is operable to receive signals from the second network node on two or more reception carriers and transmit data to the second network node on one or more transmission carriers. Each reception carrier being transmitted within an associated a radio band. The method comprises the steps of: (i) monitoring for a signal on at least two of the reception carriers; (ii) generating feedback information for at least two of the reception carriers based upon received signals; (iii) grouping the feedback information for reception carriers being transmitted within the same radio band; and encoding said grouped feedback information for two or more reception carriers being transmitted within the same radio band; and iv) transmitting the encoded feedback information to the second network node on one or more transmission carriers.
摘要:
A radio communication system comprises a first radio station (100) and one or more second radio stations (200). When transmitting a signal, the second radio station (200) employs power ramping to increase its transmit power up to a maximum value in a sequence of power steps. The first radio station (100) is able to control the maximum transmit power and rate of increase of transmit power of the second station (200) by transmitting indications of these parameters to the second station (200).