Pre-allocated random access identifiers
DCFirst Claim
1. A method of operating a wireless cellular system, comprising:
- transmitting, from a serving base station, an indication of a first reserved set of access identifiers usable for non-contention access over a first random access channel by a mobile station in a coverage area of the serving base station;
transmitting, from a target base station, an indication of a second reserved set of access identifiers usable for non-contention access over a second random access channel by the mobile station in a coverage area of the target base station;
enabling the mobile station to obtain, during a handover of the mobile station from the serving base station to the target base station, an indication of a non-contention reserved access identifier identifying the mobile station in the coverage area of the target base station, the non-contention reserved access identifier belonging to the second reserved set of access identifiers;
receiving, at the target base station, from the mobile station, the non-contention reserved access identifier over the second random access channel;
transmitting, to the mobile station, from the target base station, a feedback message comprising a timing adjustment; and
receiving, at the target base station, a transmission from the mobile station, the transmission characterized by at least one adjusted operating parameter based at least in part on the feedback message.
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Abstract
Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more identifiers to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.
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Citations
29 Claims
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1. A method of operating a wireless cellular system, comprising:
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transmitting, from a serving base station, an indication of a first reserved set of access identifiers usable for non-contention access over a first random access channel by a mobile station in a coverage area of the serving base station; transmitting, from a target base station, an indication of a second reserved set of access identifiers usable for non-contention access over a second random access channel by the mobile station in a coverage area of the target base station; enabling the mobile station to obtain, during a handover of the mobile station from the serving base station to the target base station, an indication of a non-contention reserved access identifier identifying the mobile station in the coverage area of the target base station, the non-contention reserved access identifier belonging to the second reserved set of access identifiers; receiving, at the target base station, from the mobile station, the non-contention reserved access identifier over the second random access channel; transmitting, to the mobile station, from the target base station, a feedback message comprising a timing adjustment; and receiving, at the target base station, a transmission from the mobile station, the transmission characterized by at least one adjusted operating parameter based at least in part on the feedback message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a wireless cellular system, comprising:
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transmitting, from a target base station, an indication of a reserved set of access identifiers from a plurality of access identifiers for non-contention access over a shared random access channel in a coverage area of the target base station; communicating, from the target base station, an indication of a non-contention reserved access identifier, the non-contention reserved access identifier belonging to the reserved set of access identifiers; transmitting, from the target base station to a mobile station, information about a shared random access channel available in the coverage area of the target base station; transmitting, from the mobile station to the target base station, the non-contention reserved access identifier over the shared random access channel for handover; receiving, at the mobile station from the target base station, a feedback message comprising a timing adjustment; and adjusting uplink transmission timing of the mobile station using the received timing adjustment. - View Dependent Claims (12, 13, 14, 15)
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16. A wireless cellular system comprising:
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a mobile station; a serving base station operable to transmit to the mobile station an indication of a first reserved set of access identifiers usable for non-contention access over a first random access channel by the mobile station in a coverage area of the serving base station; and a target base station operable to; transmit an indication of a second reserved set of access identifiers usable for non-contention access over a second random access channel by the mobile station in a coverage area of the target base station; transmit, during a handover of the mobile station from the serving base station to the target base station, an indication of a non-contention reserved access identifier identifying the mobile station in the coverage area of the target base station, the non-contention reserved access identifier belonging to the second reserved set of access identifiers; receive the non-contention reserved access identifier from the mobile station over the second random access channel; and transmit to the mobile station a feedback message comprising a timing adjustment; the mobile station operable to adjust at least one operating parameter of a transmission to the target base station, based at least in part on the feedback message. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A wireless cellular system comprising:
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a mobile station; and a base station operable to; transmit to the mobile station an indication of a reserved set of access identifiers usable for non-contention access over a shared random access channel by the mobile station in a coverage area of the base station; communicate to the mobile station an indication of a non-contention reserved access identifier, the non-contention reserved access identifier belonging to the reserved set of access identifiers; transmit to the mobile station information about the shared random access channel; the mobile station operable to; transmit to the base station the non-contention reserved access identifier over the shared random access channel; receive from the base station a feedback message comprising a timing adjustment; and adjust uplink transmission timing of the mobile station using the received timing adjustment. - View Dependent Claims (26, 27, 28, 29)
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Specification