The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 1999
Filed:
Jun. 07, 1996
Mika Tuutijarvi, Oulu, FI;
Raimo Klemetti, Oulu, FI;
Jorma Savolainen, Oulu, FI;
Eero Makikallio, Oulu, FI;
Nokia Mobile Phones, Ltd., Salo, FI;
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.