Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-06-07
1999-02-09
Urban, Edward F.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455442, 370331, H04J 316
Patent
active
058706755
ABSTRACT:
The invention is related to a method for improving handover in reception and transmission in a digital cellular mobile communication system including base stations and mobile stations, in which mobile station receives from a base station a handover command in the middle of speech reception or transmission on a first reception or transmission channel, whereby in the handover, the reception/transmission is changed to a second reception or transmission channel. Particularly the invention is related to mobile communication systems based on time division multiple access, in which transmission and reception occur in bursts in separate time slots. In the method according to the invention, speech is sampled, or, in transmission, it is A/D converted (32), and in reception, it is D/A converted (22) during the handover and stored in memory, e.g. in buffers, and taken into use in reception during the handover by D/A converting (24) it for a loudspeaker, and in transmission, by transmitting (34) it immediately after the handover. This method shortens the silent period in the handover.
REFERENCES:
patent: 5081679 (1992-01-01), Dent
patent: 5345448 (1994-09-01), Keskitalo
patent: 5410733 (1995-04-01), Niva et al.
patent: 5483668 (1996-01-01), Malkamaki et al.
patent: 5524009 (1996-06-01), Tuutijarvi et al.
Klemetti Raimo
Makikallio Eero
Savolainen Jorma
Tuutijarvi Mika
Nguyen Thuan T.
Nokia Mobile Phones Ltd.
Urban Edward F.
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