Invention Grant
US06768908B1 Method and apparatus for soft handoff communications in a communication system operating according to IS-95B and IS-95C standards
有权
在根据IS-95B和IS-95C标准操作的通信系统中用于软切换通信的方法和装置
- Patent Title: Method and apparatus for soft handoff communications in a communication system operating according to IS-95B and IS-95C standards
- Patent Title (中): 在根据IS-95B和IS-95C标准操作的通信系统中用于软切换通信的方法和装置
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Application No.: US09545125Application Date: 2000-04-07
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Publication No.: US06768908B1Publication Date: 2004-07-27
- Inventor: Louay Jalloul , Keith A. Tenbrook , Yuda Yehuda Luz , Jiangnan (Jason) Chen , Ron Rotstein
- Applicant: Louay Jalloul , Keith A. Tenbrook , Yuda Yehuda Luz , Jiangnan (Jason) Chen , Ron Rotstein
- Main IPC: H04Q720
- IPC: H04Q720

Abstract:
A method and apparatus provide for soft handoff operation of at least a first signal transmitted according to a first communication standard (IS-95B) and a second signal transmitted according to a second communication standard (IS-95C). A mobile station (104) initially receives the first signal, detects presence of a pilot signal, measures pilot signal strength, transmits a pilot strength measurement message, fails to receive a handoff direction message after transmitting the pilot strength measurement message, searches for detecting presence of a broadcast control channel associated with the type IS-95C cell sites, measures a carrier to interference ratio of the broadcast control channel, compares the carrier to interference ratio to a threshold, if the carrier to interference ratio is above the threshold, initiates a second communication according to IS-95C standard, thus, allowing initiating a soft handoff operation by allowing the base sites to transmit information according to the IS-95B and IS-95C standards respectively via the first and second signals. MS 104 combines the first and second signals to take advantage of the soft hand-off operation.
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