Telefonaktiebolaget Lm Ericsson (publ)

Peter Bjork

Linus Ericsson

Anders Johansson

Johan Skold

Dan Pettersson

Mikael Svantesson

An arrangement for releaseably attaching a unit to an attachment surface includes a first pair of cooperative engagement members and a second pair of cooperative engagement members. In each pair of cooperative engagement members, one member is fastened to the attachment surface, and the other member is attached to the unit. In each pair of engagement members, one engagement member is formed by a wedge member, and at least one engagement member in one of the pairs is movably attached in relation to its cooperative engagement member. On assembly and disassembly, respectively, the moveable engagement member can be displaced from the cooperative engagement member. In the engagement position, the movable engagement member is fastened against its cooperative engagement member by a tightening device, as a support surface of the unit is in close contact with a support surface on the attachment surface.

Arrangement for releaseable attachment of a unit to an attachment surface

Time dispersion of a signal that has been received from a channel is measured by utilizing metrics to determine the energy inside an equalizer window and outside of the equalizer window. In one embodiment, the estimate of the energy outside the window is a difference between residual interference estimates. In another embodiment, the estimate of the energy outside the window is a difference between residual impulse response power estimates.

Time dispersion measurement in radio communications systems

A method and apparatus takes into account the Doppler shift of the information in a received burst, a frequency offset value is calculated for each received burst. For each burst, a signal quality value is calculated, which is compared with a predetermined signal quality threshold level. The absolute value of each of the frequency offset values whose signal quality value meets or exceeds the predetermined signal quality threshold is obtained. The frequency offset values whose signal quality values do not meet the threshold level are disregarded. The total mean of all of the absolute frequency offset values is then calculated. The total mean value is used to accurately estimate the speed of the mobile station. Consequently, the speed of faster and slower mobile stations can be readily distinguished, and a hierarchical cell structure can be effectively used to increase capacity and reduce handovers in a cellular communications system.

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Rosersberg, Sweden

Peter Bjork