Method of performing uplink synchronization in wireless communication system
DCFirst Claim
1. A method of performing uplink synchronization in a wireless communication system, the method comprising:
- transmitting a random access preamble from a user equipment (UE) to a network, the random access preamble selected by the UE from a set of random access preambles;
receiving at the UE a random access response from the network, the random access response comprising a temporary UE identifier and a time alignment value for uplink synchronization with the network;
starting a time alignment timer in the UE responsive to receiving of the time alignment value;
determining whether contention resolution is successful between the UE and the network; and
stopping the time alignment timer in the UE if the contention resolution is not successful.
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Abstract
A method of performing uplink synchronization in a wireless communication system includes transmitting a random access preamble which is randomly selected from a set of random access preambles, receiving a random access response, the random access response comprising a random access preamble identifier corresponding to the random access preamble and a time alignment value for uplink synchronization, starting a time alignment timer after applying the time alignment value, starting a contention resolution timer after receiving the random access response, wherein contention resolution is not successful when the contention resolution timer is expired, and stopping the time alignment timer when the contention resolution timer is expired.
117 Citations
18 Claims
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1. A method of performing uplink synchronization in a wireless communication system, the method comprising:
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transmitting a random access preamble from a user equipment (UE) to a network, the random access preamble selected by the UE from a set of random access preambles; receiving at the UE a random access response from the network, the random access response comprising a temporary UE identifier and a time alignment value for uplink synchronization with the network; starting a time alignment timer in the UE responsive to receiving of the time alignment value; determining whether contention resolution is successful between the UE and the network; and stopping the time alignment timer in the UE if the contention resolution is not successful. - View Dependent Claims (2)
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3. A method of performing uplink synchronization in a wireless communication system, the method comprising:
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transmitting a random access preamble from a user equipment (UE) to a network, the random access preamble selected by the UE from a set of random access preambles; receiving at the UE a random access response from the network, the random access response comprising a temporary UE identifier; starting a time alignment timer in the UE after receiving the random access response; determining in the UE whether contention resolution between the UE and the network is successful; and stopping the time alignment timer in the UE if the contention resolution between the UE and the network is determined not successful. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A user equipment (UE) performing uplink synchronization in a wireless communication system, the UE comprising:
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a processor selecting a random access preamble from a set of random access preambles; a transmitter transmitting the selected random access preamble to a network; a receiver receiving a random access response from the network, the random access response comprising a temporary UE identifier and a time alignment value for uplink synchronization with the network; the processor starting a time alignment timer in the UE responsive to receiving of the time alignment value; the processor determining whether contention resolution is successful between the UE and the network; and the processor stopping the time alignment timer in the UE if the contention resolution is not successful. - View Dependent Claims (11)
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12. A user equipment (UE) performing uplink synchronization in a wireless communication system, the UE comprising:
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a processor selecting a random access preamble from a set of random access preambles; a transmitter transmitting the selected random access preamble to a network; a receiver receiving a random access response from the network, the random access response comprising a temporary UE identifier; the processor starting a time alignment timer in the UE after the random access response is received; the processor determining whether contention resolution between the UE and the network is successful; and the processor stopping the time alignment timer in the UE if the contention resolution between the UE and the network is determined not successful. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification