Telefonaktiebolaget Lm Ericsson (Publ)

Tomas Sandin

Magnus Persson

Paul Mihkel Teder

Paul Peter Butovitsch

Lars B Johansson

Peter Butovitsch

Hangkan Persson

A plurality of base stations are operated in CDMA macrodiversity mode to communicate a message to a mobile station via an air interface. If the message is successfully communicated to one of the base stations via a packet network, the base station communicates the message to the mobile station via the air interface using CDMA. Otherwise, the base station refrains from communicating any message to the mobile station.

Accommodating packet data loss at base stations interfacing between a packet switched network and a CDMA macrodiversity network

Methods of controlling the power levels of transmitted signals in telecommunication systems are described. For example, a remote terminal measures the quality of a received signal, either by determining the frame error rate or the bit error rate, and reports its quality measurement to a network by sending a quality message. The network causes the signal transmitters to adjust their transmit power levels appropriately. Faster power control methods may be combined with slower power control methods for downlink (network to remote terminal) transmissions in various communications scenarios, such as soft hand-overs.

Transmit power control in a radio communication system

A method for power estimation in DS-CDMA schemes employing non-coherent detection is disclosed. By buffering channel complex amplitudes and, subsequent to non-coherent detection of a received symbol, coherently averaging the complex amplitudes retrieved, an accurate power estimate is achieved. By further estimating the Doppler frequency in an alternate embodiment, an even better estimate can be achieved. The amplitude of the channel can be regarded as constant over a longer time period than merely one symbol and the coherent averaging generates more accurate power estimates than that achieved by non-coherent averaging. By estimating the Doppler frequency and only averaging coherently over a period no longer than the coherence time an even better estimate is achieved. The variance of the estimates is decreased and the effect of biasing is increasingly limited.

Method and apparatus for coherently-averaged power estimation

Apparatus and associated method for improving the radio link performance of a radio communication system, such as a cellular communication system. Multi-stage encoding and interleaving of the data bits of a digital information signal is performed at a single logical device, such as a radio base station. By performing two stages of interleaving over the same number of information frames of the data bits, only a single buffering stage is required to perform such multi-stage interleaving.

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Stockholm, Sweden

Tomas Sandin