Pre-allocated random access identifiers
DC
First Claim
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1. A method for handover of an existing communication link with a mobile station from a serving base station to a target base station, the method comprising:
- allocating, by the target base station, a random access identifier that uniquely identifies the mobile station in a coverage area of the target base station;
obtaining, by the serving base station from the target base station, an indication of the allocated random access identifier;
transmitting, by the serving base station to the mobile station over the existing communication link, the indication of the allocated random access identifier;
receiving, by the mobile station from the serving base station over the existing communication link, the indication of the allocated random access identifier;
transmitting, by the mobile station to the target base station over a random access channel, the allocated random access identifier;
receiving, by the target base station from the mobile station over the random access channel, the allocated random access identifier;
generating, by the target base station, a feedback message comprising an adjustment based on the receiving of the allocated random access identifier by the target base station;
transmitting, by the target base station to the mobile station, the feedback message;
receiving, by the mobile station from the target base station, the feedback message; and
synchronizing the mobile station with the target base station using the adjustment in association with the handover of the existing communication link.
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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 codes 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.
42 Citations
25 Claims
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1. A method for handover of an existing communication link with a mobile station from a serving base station to a target base station, the method comprising:
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allocating, by the target base station, a random access identifier that uniquely identifies the mobile station in a coverage area of the target base station; obtaining, by the serving base station from the target base station, an indication of the allocated random access identifier; transmitting, by the serving base station to the mobile station over the existing communication link, the indication of the allocated random access identifier; receiving, by the mobile station from the serving base station over the existing communication link, the indication of the allocated random access identifier; transmitting, by the mobile station to the target base station over a random access channel, the allocated random access identifier; receiving, by the target base station from the mobile station over the random access channel, the allocated random access identifier; generating, by the target base station, a feedback message comprising an adjustment based on the receiving of the allocated random access identifier by the target base station; transmitting, by the target base station to the mobile station, the feedback message; receiving, by the mobile station from the target base station, the feedback message; and synchronizing the mobile station with the target base station using the adjustment in association with the handover of the existing communication link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for handover of an existing communication link comprising:
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a mobile station; a serving base station in signal communication with the mobile station over the existing communication link; and a target base station in signal communication with the mobile station, wherein the target base station comprises a processor, a receiver, and a transmitter, the processor configured to allocate a random access identifier uniquely identifying the mobile station in a coverage area of the target base station in association with the handover of the existing communication link to the target base station, the receiver configured to receive the allocated random access identifier from the mobile station over a random access channel, the processor further configured to generate a feedback message comprising an adjustment based on the reception of the allocated random access identifier from the mobile station, and the transmitter configured to transmit the feedback message to the mobile station for synchronizing the mobile station with the target base station, wherein the serving base station comprises a module configured to receive an indication of the allocated random access identifier from the target base station, and a transmitter configured to transmit the received indication of the allocated random access identifier to the mobile station over the existing communication link, and wherein the mobile station comprises a receiver configured to receive the indication of the allocated random access identifier from the serving base station over the existing communication link, a transmitter configured to transmit the allocated random access identifier to the target base station over the random access channel, and a processor configured to synchronize the mobile station with the target base station using the adjustment. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system for handover of an existing communication link comprising:
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a mobile station; and a serving base station in signal communication with the mobile station over the existing communication link, wherein the serving base station comprises a module configured to receive an indication of an allocated random access identifier uniquely identifying the mobile station in a coverage area of another base station in association with the handover of the existing communication link to the other base station, and a transmitter configured to transmit the received indication of the allocated random access identifier to the mobile station over the existing communication link, and wherein the mobile station comprises a receiver configured to receive the indication of the allocated random access identifier from the serving base station over the existing communication link, a transmitter configured to transmit the allocated random access identifier to the other base station over a random access channel, and a processor configured to synchronize the mobile station with the other base station using an adjustment comprised by a feedback message received from the other base station. - View Dependent Claims (17, 18, 19)
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20. A system for handover of an existing communication link comprising:
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a mobile station; and a target base station in signal communication with the mobile station, wherein the target base station comprises a processor, a receiver, and a transmitter, the processor configured to allocate a random access identifier uniquely identifying the mobile station in a coverage area of the target base station in association with the handover of the existing communication link to the target base station, the receiver configured to receive the allocated random access identifier from the mobile station over a random access channel, the processor further configured to generate a feedback message comprising an adjustment based on the reception of the random access identifier from the mobile station, and the transmitter configured to transmit the feedback message to the mobile station for synchronizing the mobile station with the target base station, and wherein the mobile station comprises a receiver configured to receive an indication of the allocated random access identifier from the target base station via another base station over the existing communication link, a transmitter configured to transmit the allocated random access identifier to the target base station over the random access channel, and a processor configured to synchronize the mobile station with the target base station using the adjustment. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification
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Litigation Data
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Current AssigneeQuarterhill Inc. (f/k/a Wi-LAN Inc.)
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Original AssigneeWi-LAN Inc.
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InventorsBourlas, Yair, Newham, Adam E., Wang, Lei, Gummadi, Srikanth
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Primary Examiner(s)Afshar, Kamran
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Assistant Examiner(s)Obayanju, Omoniyi
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Application NumberUS13/565,405Publication NumberTime in Patent Office404 DaysField of Search370/331, 370/330, 455/436US Class Current370/330CPC Class CodesH04B 7/2668 Arrangements for Wireless C...H04J 11/0073 Acquisition of primary sync...H04L 27/2601 Multicarrier modulation sys...H04L 5/0051 of dedicated pilots, i.e. p...H04W 36/0016 Hand-off preparation specia...H04W 36/08 Reselecting an access pointH04W 64/006 with additional information...H04W 72/23 in the downlink direction o...H04W 72/51 based on terminal or device...H04W 74/004 in the uplink, i.e. towards...H04W 74/006 in the downlink, i.e. towar...H04W 74/0833 Random access procedures, e...H04W 74/085 collision avoidanceH04W 74/0875 with assigned priorities ba...H04W 74/0891 for synchronized accessH04W 76/28 Discontinuous transmission ...H04W 88/02 Terminal devicesH04W 88/08 Access point devices
