US 6,553,231 B1Granted

Method and arrangement in a telecommunication system

AssigneeTelefonaktiebolaget LM Ericsson (publ)

InventorsPatrik Karlsson, Justus Petersson

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Abstract

The present invention relates to an arrangement and a method to render the handover-related signalling traffic in a Code Division Multiple Access (CDMA)-based communication system more effective by reducing the amount of handover-related signalling traffic that must be sent between user equipment and the network. The arrangement comprises, i.a., a delay unit at least in the user equipment or in both user equipment and an appropriate network unit. The method comprises, i.a., the steps of releasing a communication link to the radio base station of a candidate cell while keeping information about the neighbor cells of said candidate cell for a delay period that is indicated by said delay unit. Accordingly, if a communication link shall be re-established to said candidate cell, its neighbor cells are only retrieved if said a delay period has expired.

Claims22

Dependent claims

Method related to a handover decision of a user equipment in a telecommunication system comprising a plurality of cells, each of which served by a corresponding radio base station,

the user equipment comprising a measurement set containing cell identities of cells that the user equipment is aware of, said measurement set being subdivided into
an active set containing cell identities of cells to which radio base station the user equipment has an established communication link,
a control set containing at least the identities of neighbour cells of said cells in the active set, characterised in
the user equipment performing the steps of
releasing an established communication link to a radio base station of a candidate cell in the active set of the user equipment, if said cell does not comply with one or more decision criterions, and excluding (25,44) the cell identity of said candidate cell from the active set,
activating a delay unit (24,26,45) with definable delay period when the cell identity of said candidate cell is excluded from the active set (25,44),
excluding the cell identities of cells without at least one neighbour cell in the changed active set from the measurement set not until said delay period has expired (27,46).

4 more elements

Dependencies are inferred from the claim text.