Hand-off technique for a wireless network
AssigneeLucent Technologies Inc.
InventorVladimir Sliva
Life of this patent
Estimating the term…
Abstract
A technique that relates to use of a known messaging sequence, e.g., ISANSWER messaging in the IS-41 protocol, in a heretofore unknown manner to improve hand-off procedures that may be established between a serving (anchor or intermediate) mobile switching center and a target (or border) mobile switching center is provided. Specifically, the ISANSWER message is selectively sent from the serving mobile switching center to the target mobile switching center during the hand-off process. The transmission of the ISANSWER message in this manner allows the target mobile switching center to terminate ring back to a caller when the mobile station answers the call after the handoff has been started, but while the mobile station is still within a cell area of the serving mobile switching center.
Claims20
A method comprising:
- initiating a hand-off procedure for a mobile device migrating between a first mobile switching center and a second mobile switching center;
- determining that the hand-off procedure is being attempted during a call termination to the mobile device;
- determining that the mobile device answers the call during the hand-off procedure, the mobile device still being within a geographic area corresponding to the first mobile switching center;
- and,
- transmitting a message from the first mobile switching center to the second mobile switching center, the message indicating that the call was answered.
A system comprising:
- means for initiating a hand-off procedure for a mobile device migrating between a first mobile switching center and a second mobile switching center;
- means for determining that a communication device is attempting to establish a call with the mobile device during the hand-off procedure;
- means for determining that the mobile device answers the call during the hand-off procedure, the mobile device being within a geographic area corresponding to the first mobile switching center;
- and,
- means for transmitting a message from the first mobile switching center to the second mobile switching center, the message indicating that the call was answered.
A system comprising:
- a first MSC operative to initiate a hand-off procedure for a mobile device migrating out of a geographic area corresponding to the first MSC, determine that a communication device is attempting to establish a call with the mobile device during the hand-off procedure, determine that the mobile device answers the call during the hand-off procedure while the mobile device is within the geographic area corresponding to the first MSC and transmit a message indicating that the call was answered;
- and,
- a second MSC operative to receive the message and end ring back based on the message.
Dependencies are inferred from the claim text.