Telefonaktiebolaget Lm Ericsson (Publ)

Sylvain Briere

Daniel Dufour

Vincent Guimont

Patrik Torgny Karlsson

Daniel Bringby

Mark Murphy

A system and method are presented for optimally retuning channel equipment in a base station serving a cell from a first channel group to a second channel group, without dropping pending calls and maintaining channel separation throughout the retune above a predetermined threshold. A sequential order for retuning the channel equipment is determined which insures that every channel equipment is retuned to a channel that is separated from the operating channels of each other channel equipment in a cell by a certain threshold. After determining the appropriate order, the status of each channel equipment is checked to determine whether the channel equipment is busy or idle. Based on the status of each channel equipment, the channel equipment are simultaneously retuned in groups of the size equivalent to the number of idle channel equipment in the determined sequential order. A pending call on a busy channel equipment to be retuned is transferred to another channel equipment which is outside of the group to be retuned, using an intra-cell hand-off. The channel equipment are retuned iteratively in this manner until each channel equipment is retuned.

System and method for robust automatic cell retune

Interference and bit error rate measurements are made on the uplink and downlink to determine communications quality. Mobile station mobile assisted hand-off (MAHO) functionality is utilized to make the downlink measurements. Following filtering, the measurements are evaluated to identify potential candidates for reallocation. In one type of evaluation, when measured downlink bit error rate on a selected frequency is lower than a threshold and is worse than measured uplink bit error rate, then a better quality candidate is chosen to replace the selected frequency. In another type of evaluation, when a best available candidate has better interference than a worst quality one of the selected frequencies, that best candidate is chosen to replace the selected frequency.

Automated tool method for frequency plan revision within a cellular telephone system

A frequency plan revision proposal is evaluated to determine whether it is compatible with the current cell configuration by insuring that sufficient frequencies having appropriate operating modes are available for assignment to meet the traffic and control channel requirements and availability of the included cell transceivers. A record is kept of previously approved proposals resulting in a revision to the frequency plan assignment. A determination is then made as to whether the current proposal if implemented would have an adverse effect on the network in view of the previously approved proposals maintained by the record. An adverse effect is found when: a sub-frequency group/frequency dropped and/or added by the proposal at issue matches or is adjacent to a sub-frequency group/frequency dropped and/or added in the record of the previously approved proposals; and the distance between the cell of the proposal at issue and the cell of the previously approved proposal in the record are within a certain threshold distance of each other.

Method for frequency mode validation for, frequency assignment for, and

Utilizing a three pass processing procedure, a frequency plan revision proposal is defined, verified, implemented and confirmed by a network operator. In a first pass (evaluation), interference and bit error rate measurements are evaluated and used to create one or more proposals. These proposals are evaluated to confirm compatibility with the current cell configuration, coordination with previous proposals, and assignment of frequencies. In a second pass (pre-update verification), more measurements are evaluated to confirm the first pass proposals. A single proposal for each selected cell is then chosen for implementation in a network update. In a third pass (post-update verification), the measurements are again evaluated to verify, following the update, that the implementation of the proposal had a positive effect on the network.

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Laval, Canada

Sylvain Briere