Methods and arrangements for mobility management
First Claim
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.
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Accused Products
Abstract
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.
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Citations
23 Claims
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1. A method for mobility management in a user equipment for use in a cellular communications system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A user equipment adapted for use in a cellular communications system, comprising:
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a maintaining unit for maintaining at least two sets of mobility trigger parameters, each set of mobility trigger parameters corresponding to a predetermined user equipment speed range; a speed range estimator adapted to determine 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 a mobility processor adapted to select, 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 decision. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for mobility management in a network base station of a cellular communications system, wherein the network base station is acting as a serving base station of a user equipment, the method comprising:
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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 cell handover decisions. - View Dependent Claims (19, 20)
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21. A network base station adapted for use in a cellular communications system and for acting as a serving base station of a user equipment, comprising:
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a maintaining unit for maintaining at least two sets of mobility trigger parameters, each set of mobility trigger parameters corresponding to a predetermined user equipment speed range; a speed range estimator adapted to determine 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 a mobility processor adapted to select, 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 cell handover decisions. - View Dependent Claims (22, 23)
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Specification