METHOD OF CONTROLLING UPLINK SYNCHRONIZATION STATE AT A USER EQUIPMENT IN A MOBILE COMMUNICATION SYSTEM
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Abstract
A method of controlling uplink synchronization state at a user equipment in a mobile communication system is disclosed. The method of controlling an uplink synchronization state at a user equipment in a mobile communication system comprises receiving control information associated with controlling uplink synchronization state of the user equipment from a network, releasing uplink resources allocated from the network if the uplink synchronization state is shifted from a synchronization state to an asynchronous state based on the control information.
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Citations
32 Claims
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1-12. -12. (canceled)
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13. A method of maintaining an uplink time alignment at a user equipment (UE) in a mobile communication system, the method comprising:
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receiving at the UE time alignment command information from a network; driving a timing alignment timer in the UE according to the received time alignment command information; and releasing by the UE uplink resources allocated by the network to the UE when the timing alignment timer expires. - View Dependent Claims (14, 15, 16, 17)
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18. A method of maintaining an uplink time alignment at a user equipment (UE) in a mobile communication system, the method comprising:
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receiving by the UE uplink resources allocated by a network; releasing by the UE the allocated uplink resources when a timing alignment timer of the UE expires; and performing a random access procedure with the network when the timing alignment timer expires to obtain uplink timing alignment information from the network. - View Dependent Claims (19, 20, 21, 22)
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23. A method of maintaining an uplink time alignment at a user equipment (UE) in a mobile communication system, the method comprising:
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receiving at the UE time alignment command information from a network; driving a timing alignment timer in the UE according to the received time alignment command information; and performing a random access procedure with the network when the timing alignment timer expires to obtain uplink timing alignment information from the network. - View Dependent Claims (24, 25, 26, 27)
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28. A user equipment (UE) maintaining an uplink time alignment in a mobile communication system, the UE comprising:
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a physical layer receiving time alignment command information from a network; and a timing alignment timer driven according to the received time alignment command information, wherein uplink resources allocated by the network are released when the timing alignment timer expires. - View Dependent Claims (29, 30, 31, 32)
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Specification