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 maintaining time alignment of a user equipment (UE) in a mobile communication system by performing random access procedures, the method comprising:
- receiving by the UE a random access channel (RACH) response from the network to enter into a synchronization state, wherein the RACH response comprises a timing command;
starting a time alignment timer for uplink time alignment of the UE when the timing command is received from the network, wherein the time alignment timer is for determining the UE is in an uplink synchronization state; and
releasing by the UE uplink channel resources allocated by the network to the UE when the time alignment timer expires, wherein the uplink synchronization state of the UE is shifted to an asynchronous state.
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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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13 Claims
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1. A method of maintaining time alignment of a user equipment (UE) in a mobile communication system by performing random access procedures, the method comprising:
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receiving by the UE a random access channel (RACH) response from the network to enter into a synchronization state, wherein the RACH response comprises a timing command; starting a time alignment timer for uplink time alignment of the UE when the timing command is received from the network, wherein the time alignment timer is for determining the UE is in an uplink synchronization state; and releasing by the UE uplink channel resources allocated by the network to the UE when the time alignment timer expires, wherein the uplink synchronization state of the UE is shifted to an asynchronous state. - View Dependent Claims (2, 3, 4, 5)
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6. A method of maintaining time alignment of a user equipment (UE) in a mobile communication system by performing random access procedures, the method comprising:
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sending a random access channel (RACH) preamble to a network to perform a first random access procedure with the network; receiving a random access channel (RACH) response from the network, wherein the RACH response comprises a timing command to enter into a synchronization state; starting a time alignment timer for uplink time alignment of the UE when the timing command is received from the network, wherein the time alignment timer is for determining the UE is in an uplink synchronization state, wherein an uplink state of the UE is shifted to an asynchronous state when the time alignment timer expires; and performing a second random access procedure with the network, the second random access procedure causing the network to send a further RACH response comprising a further timing command. - View Dependent Claims (7, 8)
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9. A user equipment (UE) maintaining time alignment in a mobile communication system by performing random access procedures, the UE comprising:
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a physical layer receiving a random access channel (RACH) response from a network to enter into a synchronization state, wherein the RACH response comprises a timing command; a time alignment timer for uplink time alignment of the UE, wherein the time alignment timer is started when the timing command is received from the network, wherein the time alignment timer is for determining the UE is in an uplink synchronization state, wherein uplink channel resources allocated by the network to the UE are released, by the UE, when the time alignment timer expires, and wherein the uplink state of the UE is shifted to an asynchronous state when the time alignment timer expires. - View Dependent Claims (10, 11, 12, 13)
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Specification