Timing alignment in an LTE system
First Claim
1. A method for use in a user terminal in a cellular communications system, according to which method the user terminal requests communication with a controlling node in a contention based random access procedure by transmitting an access request to the controlling node, and in response to the access request, the user terminal receives from the controlling node an initiation message along with a second timing advance value, different from a previously received first timing advance value, and wherein the method further includes the user terminal determining whether the first timing advance value is valid at receipt of the second timing advance value, the user terminal continuing to apply the first timing advance value to its transmissions to the controlling node after receipt of the second timing advance value if the first timing advance value is determined to be valid, and otherwise the user terminal applying the second timing advance value to its transmissions to the controlling node.
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Accused Products
Abstract
A method for use in a user terminal in a cellular communications system. According to the method, the user terminal applies a first timing advance value to its transmissions to a controlling node, and the user terminal requests communication with the controlling node in a contention based procedure by transmitting an access request (MSG 1), in response to which the controlling node transmits an initiation message (MSG 2) along with a second timing advance value. According to the method, the user terminal uses 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.
10 Citations
12 Claims
- 1. A method for use in a user terminal in a cellular communications system, according to which method the user terminal requests communication with a controlling node in a contention based random access procedure by transmitting an access request to the controlling node, and in response to the access request, the user terminal receives from the controlling node an initiation message along with a second timing advance value, different from a previously received first timing advance value, and wherein the method further includes the user terminal determining whether the first timing advance value is valid at receipt of the second timing advance value, the user terminal continuing to apply the first timing advance value to its transmissions to the controlling node after receipt of the second timing advance value if the first timing advance value is determined to be valid, and otherwise the user terminal applying the second timing advance value to its transmissions to the controlling node.
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7. A user terminal for use in a cellular communications system, the user terminal comprising:
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a transmitter configured to request communication with a controlling node in a contention based random access procedure by transmitting an access request to the controlling node; and a receiver configured to receive, in response to the access request, an initiation message from the controlling node along with a second timing advance value different from a previously received first timing advance value; one or more control circuits configured to; determine whether the first timing advance value is valid at receipt of the second timing advance value; continue to apply the first timing advance value to its transmissions to the controlling node after receipt of the second timing advance value if the first timing advance value is determined to be valid, and otherwise to apply the second timing advance value to its transmissions to the controlling node. - View Dependent Claims (8, 9, 10, 11)
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12. A method in a user terminal configured for use in a wireless communication network, said method comprising:
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receiving a first timing advance value at the user terminal; performing a contention-based random access procedure, in which the user terminal attempts to access the network and receives a second timing advance value, different from the first timing advance value and after receipt of the first timing advance value, as part of said procedure; determining whether the first timing advance value is valid at receipt of the second timing advance value; and continuing to use the first timing advance value at the user terminal for transmitting to the network on the uplink after receipt of the second timing advance value if the first timing advance value is determined to be valid, and otherwise using the second timing advance value at the user terminal for transmitting to the network on the uplink.
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Specification