Timing Alignment in an LTE System
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Abstract
A method (500) for use in a user terminal (120, 130) in a cellular communications system (100). According to the method, the user terminal applies a first timing advance value (505) to its transmissions to a controlling node (140), and the user terminal (120, 130) requests communication with the controlling node (140) in a contention based procedure by transmitting an access request (MSG 1), in response (515) to which the controlling node transmits an initiation message (MSG 2) along with (520) a second timing advance value. According to the method (500), the user terminal (120, 130) uses (530) the first timing advance value if the user terminal loses the contention based procedure, i.e. if the controlling node subsequently continues the initiated communication with said other user terminal.
154 Citations
43 Claims
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1-21. -21. (canceled)
- 22. A method for use in a user terminal in a cellular communications system, according to which method the user terminal applies a first timing advance value to its transmissions to a controlling node, and according to which method the user terminal requests communication with the controlling node in a contention based procedure by transmitting an access request, and in response the user terminal receives from the controlling node an initiation message along with a second timing advance value, and wherein the method further includes the user terminal using the first timing advance value if the user terminal loses the contention based procedure, wherein the controlling node subsequently continues the initiated communication with another user terminal.
- 33. A transceiver for use as a user terminal in a cellular communications system, the transceiver comprising one or more control circuits configured to apply a first timing advance value to its transmissions to a controlling node, request communication with the controlling node in a contention based procedure by transmitting an access request, receive in response an initiation message from the controlling node along with a second timing advance value, and to use the first timing advance value if the user terminal loses the contention based procedure, wherein the controlling node subsequently continues the initiated communication with another user terminal.
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43. A method in a user terminal configured for use in a wireless communication network, said method comprising:
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maintaining a timing advance value at the user terminal, for use in transmitting to the network on the uplink; performing a contention-based access procedure, in which the user terminal attempts to access the network and receives new timing advance information as part of said procedure; and updating the timing advance value at the user terminal according to the new timing advance information, in dependence on whether the user terminal won the contention-based access procedure.
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Specification