Method and apparatus for implementing a handoff between...

Details Method and apparatus for implementing a handoff between... Method and apparatus for implementing a handoff between...

H - Electricity

04

W

H04W 36/14 (2009.01) H04W 36/30 (2009.01)

Patent

CA 2608840

A method and apparatus for implementing a handoff between radio access networks (RANs)(110a) 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 in the coverage area of the RAN to the WTRU. The WTRU stores the list and determines whether handoff criteria is met by one of the co-located RANs. The WTRU then initiates a handoff from a current RAN to a target RAN if the handoff criteria is met by the target RAN (110a). 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 and initiate a handoff to the selected RAN if the handoff criteria is met.

L'invention concerne un procédé et un appareil de mise en oeuvre d'un transfert entre des réseaux d'accès radio (RAN) déployés selon différentes technologies d'accès radio (RAT). Une unité d'émission-réception sans fil (WTRU) est équipée d'au moins deux unités radio pour prendre en charge les RAT. Chaque RAN envoie à la WTRU une liste de RAN cositués dans sa propre zone de couverture. La WTRU enregistre la liste et détermine si des critères de transfert sont satisfaits par l'un des RAN cositués. La WTRU démarre ensuite un transfert d'un RAN courant à un RAN cible si les critères de transfert sont satisfaits par le RAN cible. En variante, la WTRU peut envoyer au RAN courant un rapport de mesure au moyen duquel le RAN courant détermine si des critères de transfert sont satisfaits par un RAN choisi parmi les RAN cositués, et démarre ensuite un transfert si les critères de transfert vers le RAN choisi sont satisfaits.

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