Method and apparatus for freeing a frame to aid in handoff...

Details Method and apparatus for freeing a frame to aid in handoff... Method and apparatus for freeing a frame to aid in handoff...

H - Electricity

04

B

H04B 7/216 (2006.01) H04Q 7/00 (2006.01) H04Q 7/38 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2286179

A mobile station (106) in a code division multiple access (CDMA) communication system (100) implements scanning of pilot channels on a different frequency by reserving a periodic frame on the forward channel to allow the mobile station (106) to change frequencies and scan for other pilot channels. To preserve some aspects of voice quality, both the base station (102) and mobile station (106) voice encode speech at a maximum of half rate and transmit the information as secondary traffic prior to the frame where the mobile station (106) scans the alternate frequency. To maximize the trade-off between voice quality and frequency of the scan, the base station (102) indicates to the mobile station (106) the period between other frequency scans via messaging. To ensure compatibility, this method can be negotiated via known service configuration negotiation techniques.

Cette invention concerne une station mobile (106) utilisée dans un système de communications à accès multiple par répartition de code (100) (AMRC). Cette station mobile (106) va effectuer un balayage des canaux pilotes sur une fréquence différente en réservant une trame périodique sur le canal avant, ceci de manière à ce qu'elle puisse changer de fréquences et effectuer des balayages sur d'autres canaux pilotes. Afin de conserver certains critères de qualité vocale, la station de base (102) et la station mobile (106) vont toutes deux coder les signaux vocaux selon un maximum d'un demi-débit, puis transmettre les informations sous forme de trafic secondaire avant la trame dans laquelle la station mobile (106) balaye l'autre fréquence. Afin de maximiser le compromis entre la qualité vocale et la fréquence de balayage, la station de base (102) va indiquer par messagerie à la station mobile (106) la période séparant les autres balayages de fréquence. Afin d'assurer la compatibilité, ce procédé peut faire l'objet de discussions en ayant recours aux techniques connues de négociation des configurations de services.

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