Random access preamble collision detection
First Claim
1. A method for use in a user terminal in a cellular communications system, the method comprising:
- the user terminal applying a timing advance to its transmissions to a controlling node, wherein the timing advance being an offset value in time at which the user terminal needs to start its transmission time relative to a nominal transmission time specified by the controlling node;
the user terminal requesting communication with the controlling node by means of a special message;
in response to the special message the user terminal receiving a response message which includes an updated value for the timing advance;
the user terminal comparing the updated value for the timing advance with the value of the timing advance that the user terminal had prior to the reception of said response message, and if the difference (Δ
) between the prior value and the updated value is greater than a first predetermined threshold or below a second predetermined threshold, the user terminal ignoring the response message and renewing its request for communication.
1 Assignment
0 Petitions
Accused Products
Abstract
A method (500) for a user terminal (120, 130) in a cellular system (100). The user terminal (120, 130) applies (505) a timing advance to transmissions to a controlling node (140). The user terminal (120, 130) requests (510) communication with the controlling node (140) by a special message (MSG 1), in response to which the user terminal (120, 130) receives (515) a message (MSG 2) which includes an updated value for the timing advance. The user terminal (120, 130) compares (520) the updated value with the value of the timing advance that the user terminal had prior to the reception of said response message. If the difference (Δ) between the prior value and the updated value is greater than a first predetermined threshold (T1) or below a second predetermined threshold (T2), the user terminal (120, 130) ignores (525) the response message (MSG 2) and renews its request for communication.
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Citations
19 Claims
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1. A method for use in a user terminal in a cellular communications system, the method comprising:
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the user terminal applying a timing advance to its transmissions to a controlling node, wherein the timing advance being an offset value in time at which the user terminal needs to start its transmission time relative to a nominal transmission time specified by the controlling node; the user terminal requesting communication with the controlling node by means of a special message; in response to the special message the user terminal receiving a response message which includes an updated value for the timing advance; the user terminal comparing the updated value for the timing advance with the value of the timing advance that the user terminal had prior to the reception of said response message, and if the difference (Δ
) between the prior value and the updated value is greater than a first predetermined threshold or below a second predetermined threshold, the user terminal ignoring the response message and renewing its request for communication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16)
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9. A transceiver for use as a user terminal in a cellular communications system, the transceiver comprising:
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means for applying a timing advance to its transmissions to a controlling node, wherein the timing advance being an offset value in time at which the user terminal needs to start its transmission time relative to a nominal transmission time specified by the controlling node; means for requesting communication with the controlling node by means of a special message; means for receiving a response message which includes an updated value for the timing advance; means for comparing the updated value for the timing advance with the value of the timing advance that the transceiver had prior to the reception of said response message; and means for ignoring the response message and renewing the request for communication if the difference (Δ
) between the prior value and the updated value is greater than a first predetermined threshold or below a second predetermined threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15, 17)
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18. A method of operating a user terminal in a cellular communications system, the method comprising:
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receiving an updated timing advance value in a message received from a controlling node; determining whether the message bearing the updated timing advance value is intended to the user terminal by making a comparison of the updated timing advance value with a prior timing advance value that the user terminal had prior to the reception of the message; and if the difference (Δ
) between the prior timing advance value and the updated timing advance value is greater than a first predetermined threshold or below a second predetermined threshold ignoring the message from the controlling node. - View Dependent Claims (19)
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Specification