Telefonaktiebolaget Lm Ericsson (Publ)

Bengt Norstedt

Roland Stig Bodin

Anders Mile'n

Magnus Wester

A method for monitoring synchronization deviation in a mobile telecommunication system is disclosed. The system records the deviation in the synchronization between base stations which may be computed from measurements made at handover of a mobile station between base stations and when the deviation exceeds a predetermined threshold, an alarm is triggered which provides an alert to adjust the synchronization of the system.

Synchronization deviation detection

A disconnect time in accordance with the Global System for Mobile (GSM) Phase 1 standard is reduced within a particular base station controller (BSC) serving a particular mobile station. In response to a Layer 2 Disconnect message from a first mobile station and after the expiration of the reduced disconnect timer, the serving BTS releases the indicated logical channel from the first mobile station and enables the connected base station control (BSC) to more efficiently allocate the released logical channel (SDCCH or TCH) to a second mobile station. Thereafter, additional Layer 2 Disconnect messages transmitted by the first mobile station are ignored and no acknowledging Disconnect Mode (DM) message is transmitted over the indicated logical channel. Thus, collision over the same logical channel between the first and second mobile stations is avoided and the second mobile station is able to communicate over the allocated logical channel.

Growing community of inventors

Djursholm, Sweden

Bengt Norstedt