METHOD AND APPARATUS FOR ROBUST HANDOFF IN WIRELESS COMMUNICATION SYSTEMS
First Claim
1. An apparatus adapted for wires communications, comprising:
- means for measuring powers of signals transmitted from a plurality of base station transceivers;
means for identifying each base station transceiver whose measured signal power is greater than a threshold;
means for placing indicators of said identified base station transceivers to a first set;
means for transmitting the indicators; and
means for receiving a direction message from at least one of the identified base station transceivers not in communication with a mobile station via a traffic channel.
1 Assignment
0 Petitions
Accused Products
Abstract
A communication system that allows a soft handoff to be completed, even when the communications link between the active base station and the mobile station deteriorates before the mobile station has received the handoff direction message. The mobile station maintains a list of base stations that the mobile station is in communication with, referred to as an “Active Set”. In addition, the mobile station maintains another list of base stations that are proximate to the base stations in the active set. This list is referred to as the “Neighbor Set”. In accordance with the disclosed method and apparatus, the mobile station places a base station in the active set upon including the base station in a pilot strength measurement message (PSMM). The mobile station monitors transmissions from all of the base stations on the active set to receive a handoff direction message (HDM).
-
Citations
12 Claims
-
1. An apparatus adapted for wires communications, comprising:
-
means for measuring powers of signals transmitted from a plurality of base station transceivers;
means for identifying each base station transceiver whose measured signal power is greater than a threshold;
means for placing indicators of said identified base station transceivers to a first set;
means for transmitting the indicators; and
means for receiving a direction message from at least one of the identified base station transceivers not in communication with a mobile station via a traffic channel. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method for wireless communications, comprising:
-
measuring powers of signals transmitted from a plurality of base station transceivers;
identifying each base station transceiver whose measured signal power is greater than a threshold;
placing indicators of said identified base station transceivers to a first set;
transmitting the indicators; and
receiving a direction message from at least one of the identified base station transceivers not in communication with the mobile station via a traffic channel. - View Dependent Claims (7, 8, 9)
-
-
10. A computer program product, comprising:
-
code for measuring powers of signals transmitted from a plurality of base station transceivers;
code for identifying each base station transceiver whose measured signal power is greater than a threshold;
code for placing indicators of said identified base station transceivers to a first set;
code for transmitting the indicators; and
code for receiving a direction message from at least one of the identified base station transceivers not in communication with a mobile station via a traffic channel. - View Dependent Claims (11, 12)
-
Specification