METHOD AND APPARATUS FOR IMPLEMENTING A HANDOFF BETWEEN RADIO ACCESS NETWORKS DEPLOYED UNDER DIFFERENT RADIO ACCESS TECHNOLOGIES

摘要

A METHOD AND APPARATUS FOR IMPLEMENTING A HANDOFF BETWEEN RADIO ACCESS NETWORKS (RANs) DEPLOYED UNDER DIFFERENT RADIO ACCESS TECHNOLOGIES, RATs ARE DISCLOSED. A WIRELESS TRANSMIT/RECEIVE UNIT, WTRU (150) IS EQUIPPED WITH AT LEAST TWO RADIO UNITS TO SUPPORT THE RATs. EACH RAN SENDS A LIST OF CO-LOCATED RANs (110A, 110B) IN THE COVERAGE AREA OF THE RAN TO THE WTRU (150). THE WTRU (150) STORES THE LIST AND DETERMINES WHETHER HANDOFF CRITERIA IS MET BY ONE OF THE CO-LOCATED RANs. THE WTRU (150) THEN INITIATES A HANDOFF FROM A CURRENT RAN TO A TARGET RAN IF THE HANDOFF CRITERIA IS MET BY THE TARGET RAN. ALTERNATIVELY, THE WTRU MAY SEND A MEASUREMENT REPORT TO THE CURRENT RAN, WHEREBY THE CURRENT RAN DETERMINES WHETHER HANDOFF CRITERIA IS MET BY A SELECTED ONE OF THE CO-LOCATED RANs (110A, 110B) AND INITIATE A HANDOFF TO THE SELECTED RAN IF THE HANDOFF CRITERIA IS MET. THE MOST ILLUSTRATIVE DRAWING IS FIGURE 1.