Methods and apparatus for performing handoffs in a multi-carrier wireless communications system
First Claim
1. A method of operating a mobile communications device to implement a handoff of a mobile communications device between a first network attachment point and a second network attachment point, said mobile communications device having a first wireless communications link with the first network attachment point at the time said handoff is initiated, said first wireless communication link using signals in a first frequency band, the method comprising:
- communicating to said second network attachment point, via a first signal communicated over said first wireless communications link, an intent to initiate a handoff to said second network attachment point;
receiving, via said first wireless communications link, information indicating a dedicated air link resource assigned to said mobile device by said second network attachment point to be used in communicating with said second network attachment point over a second frequency band which is different from said first frequency band;
terminating said first wireless communications link; and
using said dedicated communications resource to transmit a signal over the air in said second frequency band to establish a second wireless communications link with said second network attachment point.
3 Assignments
0 Petitions
Accused Products
Abstract
A mobile communications device initiates a handoff from its current base station (BS) sector network attachment point to a new BS sector. The mobile sends a handoff request over its current wireless link to the current BS sector, which forwards the request to the new BS sector, e.g., via a network link. The new BS sector processes the request assigning dedicated resources, e.g., an identifier and dedicated uplink segments. Information identifying the allocated resources is conveyed from the new BS sector via the current BS sector to the mobile. The mobile determines the time of the allocated dedicated segments based upon a received beacon signal from the new BS sector with known timing relationships to dedicated segments. The mobile breaks the original wireless link just prior to the time of the first assigned dedicated segment. The mobile communicates information on the assigned dedicated segments to perform registration operations, e.g., timing synchronization and power control, establishing a new wireless link.
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Citations
59 Claims
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1. A method of operating a mobile communications device to implement a handoff of a mobile communications device between a first network attachment point and a second network attachment point, said mobile communications device having a first wireless communications link with the first network attachment point at the time said handoff is initiated, said first wireless communication link using signals in a first frequency band, the method comprising:
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communicating to said second network attachment point, via a first signal communicated over said first wireless communications link, an intent to initiate a handoff to said second network attachment point;
receiving, via said first wireless communications link, information indicating a dedicated air link resource assigned to said mobile device by said second network attachment point to be used in communicating with said second network attachment point over a second frequency band which is different from said first frequency band;
terminating said first wireless communications link; and
using said dedicated communications resource to transmit a signal over the air in said second frequency band to establish a second wireless communications link with said second network attachment point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A mobile node for use in a communication system including a first network point of attachment which uses a first frequency band to receive user data and a second network attachment point which uses a second frequency band which is different from said first frequency band to receive user data, said mobile node comprising:
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means for initiating a handoff from said first network attachment point to said second network attachment point by communicating a signal indicating an intent to handoff to the second network attachment point transmitted in the first frequency band over a wireless communications link with said first network attachment point;
means for receiving from said second network attachment point, via a second signal communicated via said first link information indicating a resource dedicated to said mobile device by said second network attachment point to be used in communicating with said second network attachment point;
means for terminating said first communications link; and
means for transmitting a signal in said second frequency band using said dedicated communications resource to establish a second wireless communications link with said second network attachment point. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A method of implementing a handoff of a mobile communications device between a first base station and a second base station, said mobile communications device having a first wireless communications link with the first base station at the time said handoff is initiated, the method comprising operating a mobile communications device to:
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signal to said second base station via a first signal communicated over said first link an intent to initiate a handoff to said second base station;
receive from said second base station via a second signal communicated via said first link information indicating a resource dedicated to said mobile device by said second base station to be used in communicating with said second base station;
terminate said first communications link; and
use said dedicated communications resource to communicate via a second wireless communications link with said second base station. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method of implementing a mobile node handoff between a first wireless communications link with a first base station sector, said first wireless communications link using a first carrier, and a second wireless communications link with a second base station sector said second wireless communications link using a second carrier, at least the first sector being different from the second sector or the first carrier being different from the second carrier, the method comprising:
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operating said mobile node to receive a timing correction signal over said first wireless communications link;
operating said mobile node to make a transmission timing adjustment to adjusting the timing of signals transmitted by said mobile node over the first wireless communications link;
operating the mobile node to send a signal over said first wireless communications link indicating an intent to handoff to said second wireless communications link;
operating the mobile node to receive over said first wireless communications link information indicating a dedicated resource to be used by said mobile when communicating over said second wireless communications link;
operating the mobile node to terminate said first wireless communications link; and
operating the mobile node to transmit at least one of user data and a non-timing control signal over said second wireless communications link prior to making a transmission timing control adjustment based on a timing control signal received over said second wireless communications link. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A mobile node capable of performing operations used to implement a handoff between a first link with a first base station sector, said first link using a first carrier, and a second link with a second base station sector said second link using a second carrier, at least the first sector being different from the second sector or the first carrier being different from the second carrier, the mobile node comprising:
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means for receiving a timing correction signal over said first communications link;
transmission timing adjustment means for adjusting the timing of signals transmitted by said mobile node over the first link;
means for sending a signal over said first link indicating an intent to handoff to said second link;
means for receiving over said first link information indicating a dedicated resource to be used by said mobile when communicating over said second communications link;
means for terminating said first communications link; and
means for transmitting at least one of user data and a non-timing control signal over said second communications link prior to making a transmission timing control adjustment based on a timing control signal received over said second communications link. - View Dependent Claims (55, 56, 57, 58, 59)
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Specification