Methods and arrangements for mobility management

摘要

The present invention relates to methods and devices for mobility management in a cellular communications system. A user equipment maintains (21) at least two sets of mobility trigger parameters. Each set of mobility trigger parameters corresponds to a predetermined user equipment speed range. The user equipment determines (22) a speed range that the speed of the user equipment falls into and selects (23), based on the determined speed range, at least one set of mobility trigger parameters to be used for performing mobility-based decisions. If the user equipment is in connected mode a network base station may select a set of mobility trigger parameters to be used for performing handover decisions based on a determined speed range of the user equipment. Advantages are that ping-pong mobility decisions may be avoided and it is sufficient to determine a range for the UE speed, which is less complicated than determining an accurate speed of the UE particularly in idle mode.

主权项

1. A method for mobility management in a user equipment for use in a cellular communications system, comprising:
maintaining at least two sets of mobility trigger parameters, each set of mobility trigger parameters corresponding to a predetermined user equipment speed range; determining a speed range of the user equipment by monitoring the number of times that cell changes are triggered by the at least two sets of mobility trigger parameters; and selecting, based on the determined speed range of the user equipment, at least one of the maintained sets of mobility trigger parameters to be used for performing mobility-based decisions.