Signal transmission synchronization in a communication system
AssigneeMotorola, Inc.
InventorsJames M. O'Connor, Eric R. Schorman, John D. Reed, Kamyar Rohani
Life of this patent
Estimating the term…
Abstract
Transmission of candidate-sector signalling channels are synchronized to facilitate mobile-assisted handoff (MAHO) measurements by a mobile (125). Transmitters in candidate sectors each transmit their signalling channel at distinct frequencies and at predetermined intervals. The transmission of each signalling channel by each candidate sector transmitter is synchronized to provide a known reference to the mobile (125). When instructed, the mobile (125) need only to perform MAHO measurements at the predetermined intervals in the order and at the frequency instructed.
Claims15
A method of handoff facilitation in a communication system having at least first and second transmitters, the first transmitter in communication with a subscriber unit, the method comprising the steps of:
- transmitting, at the first transmitter, a first signal quality information signal at a first frequency at predetermined intervals and transmitting, at the second transmitter, a second signal quality information signal at a second frequency at said predetermined intervals;
- synchronizing said transmission of said first signal quality information signal at a first frequency and said transmission of said second signal quality information signal at a second frequency and assigning, via the first transmitter, the subscriber unit to receive said transmission of said first signal quality information signal or said transmission of said second signal quality information signal at said predetermined intervals.
A communication system having at least first and second transmitters, the first transmitter in communication with a subscriber unit, the communication system comprising:
- means, at the first transmitter, for transmitting a first signal quality information signal at a first frequency at predetermined intervals and means, at the second transmitter, for transmitting a second signal quality information signal at a second frequency at said predetermined intervals;
- and
- means, coupled to the first and second transmitters, for synchronizing said transmission of said first signal quality information signal at a first frequency and said transmission of said second signal quality information signal at a second frequency and means for assigning, via the first transmitter, the subscriber unit to receive said transmission of said first signal quality information signal or said transmission of said second signal quality information signal at said predetermined intervals.
A communication system having at least first and second transmitters, the first transmitter in communication with a subscriber unit, the communication system comprising:
- means, at the first transmitter, for transmitting a first signal quality information signal at predetermined intervals and means, at the second transmitter, for transmitting a second signal quality information signal at said predetermined intervals;
- means, coupled to the first and second transmitters, for synchronizing said transmission of said first signal quality information signal and said transmission of said second signal quality information signal and means for assigning, via the first transmitter, the subscriber unit to receive said transmission of said first signal quality information signal and said transmission of said second signal quality information signal at said predetermined intervals;
- and
- means, at the subscriber unit, for measuring a first received signal strength indication (RSSI) of said first signal quality information signal and a second RSSI of said second signal quality information signal
- wherein said RSSI's may be employed to facilitate handoff in the communication system.
A method of handoff facilitation in a communication system having at least first and second transmitters, the first transmitter in communication with a subscriber unit, the method comprising:
- transmitting from the first transmitter, a first signal quality information signal at a first frequency at predetermined intervals;
- transmitting from the second transmitter a second signal quality information signal at a second frequency at said predetermined intervals;
- synchronizing said transmission of said first signal quality information signal at a first frequency and said transmission of said second signal quality information signal at a second frequency;
- and,
- assigning, via the first transmitter, the subscriber unit to receive said transmission of said first signal quality information signal or said transmission of said second signal quality information signal at said predetermined intervals.
A method of handoff facilitation in a communication system having at least a first and second transmitters, the first transmitter in communication with a subscriber unit, the method comprising:
- transmitting, from the first transmitter, a first signal quality information signal at predetermined intervals;
- transmitting, from the second transmitter, a second signal quality information signal at said predetermined intervals;
- synchronizing said transmission of said first signal quality information signal and said transmission of said second signal quality information signal;
- assigning, via the first transmitter, the subscriber unit to receive said transmission of said first signal quality information signal and said transmission of said second signal quality information signal at said predetermined intervals;
- and,
- measuring at the subscriber unit, a first received signal strength indication (RSSI) of said first signal quality information signal and a second RSSI of said second signal quality information signal wherein said RSSI's may be employed to facilitate handoff in the communication system.
Dependencies are inferred from the claim text.