METHOD AND APPARATUS FOR ACCESSING A RANDOM ACCESS CHANNEL BY SELECTIVELY USING DEDICATED OR CONTENTION-BASED PREAMBLES DURING HANDOVER
First Claim
1. A method for a wireless transmit/receive unit (WTRU) to access a random access channel (RACH) during handover, the method comprising:
- the WTRU initiating a handover procedure;
activating a maximum handover interruption timer in the WTRU;
the WTRU transmitting a dedicated preamble in an attempt to access the RACH on a condition that the dedicated preamble is reserved in a current random access opportunity and the maximum handover interruption timer has not expired; and
the WTRU transmitting a contention-based preamble in an attempt to access the RACH on a condition that a dedicated preamble is not reserved in a current random access opportunity.
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Abstract
A method and apparatus for accessing a random access channel (RACH) during handover are disclosed. A handover procedure is initiated and a maximum handover interruption timer is activated. A dedicated preamble is transmitted in an attempt to access the RACH on a condition that the dedicated preamble is reserved in a current random access opportunity and the maximum handover interruption timer has not expired. A contention-based preamble is transmitted in an attempt to access the RACH on a condition that a dedicated preamble is not reserved in a current random access opportunity. If the maximum handover interruption timer has expired, a contention-based preamble is transmitted in an attempt to access the RACH.
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Citations
10 Claims
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1. A method for a wireless transmit/receive unit (WTRU) to access a random access channel (RACH) during handover, the method comprising:
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the WTRU initiating a handover procedure; activating a maximum handover interruption timer in the WTRU; the WTRU transmitting a dedicated preamble in an attempt to access the RACH on a condition that the dedicated preamble is reserved in a current random access opportunity and the maximum handover interruption timer has not expired; and the WTRU transmitting a contention-based preamble in an attempt to access the RACH on a condition that a dedicated preamble is not reserved in a current random access opportunity. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless transmit/receive unit (WTRU) configured to access a random access channel (RACH) during handover, the WTRU comprising:
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a maximum handover interruption timer; a processor configured to initiate handover and activate the maximum handover interruption timer; and a transmitter configured to transmit a dedicated preamble in an attempt to access the RACH on a condition that the dedicated preamble is reserved in a current random access opportunity and the maximum handover interruption timer has not expired, and transmit a contention-based preamble in an attempt to access the RACH on a condition that a dedicated preamble is not reserved in a current random access opportunity. - View Dependent Claims (7, 8, 9, 10)
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Specification