Method of controlling uplink synchronization state at a user equipment in a mobile communication system
First Claim
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1. A method of controlling an uplink synchronization state of a user equipment in a mobile communication system by performing random access procedures, the method comprising:
- receiving, by the user equipment, a random access response including a time alignment command from a network during a first random access procedure;
starting, by the user equipment, a time alignment timer for uplink time alignment when the time alignment command is received from the network;
receiving, by the user equipment, a contention resolution message from the network to determine whether the first random access procedure is successful or not, wherein the user equipment considers itself in an asynchronous state and stops the time alignment timer when the user equipment determines that the first random access procedure is not successful based on the contention resolution message; and
performing, by the user equipment, a second random access procedure when the user equipment obtains uplink data to be transmitted to the network after the time alignment timer has expired.
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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
11 Claims
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1. A method of controlling an uplink synchronization state of a user equipment in a mobile communication system by performing random access procedures, the method comprising:
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receiving, by the user equipment, a random access response including a time alignment command from a network during a first random access procedure; starting, by the user equipment, a time alignment timer for uplink time alignment when the time alignment command is received from the network; receiving, by the user equipment, a contention resolution message from the network to determine whether the first random access procedure is successful or not, wherein the user equipment considers itself in an asynchronous state and stops the time alignment timer when the user equipment determines that the first random access procedure is not successful based on the contention resolution message; and performing, by the user equipment, a second random access procedure when the user equipment obtains uplink data to be transmitted to the network after the time alignment timer has expired. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment (UE) for controlling an uplink synchronization state by performing random access procedures in a mobile communication system, the user equipment configured to:
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receive a random access response including a time alignment command from a network during a first random access procedure; start a time alignment timer for uplink time alignment when the time alignment command is received from the network; and receive a contention resolution message from the network to determine whether the first random access procedure is successful or not, wherein the user equipment considers itself as in an asynchronous state and stops the time alignment timer when the user equipment determines that the first random access procedure is not successful based on the contention resolution message; and perform a second random access procedure when the user equipment obtains uplink data to be transmitted to the network after the time alignment timer has expired. - View Dependent Claims (8, 9, 10, 11)
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Specification