US 6,983,148 B1 | ||
Handover performed within a base station controller | ||
Olli Kirla, Espoo (Finland) | ||
Assigned to Nokia Corporation, Espoo (Finland) | ||
Appl. No. 10/89,190 PCT Filed Sep. 27, 2000, PCT No. PCT/FI00/00827 § 371(c)(1), (2), (4) Date Mar. 27, 2002, PCT Pub. No. WO01/24558, PCT Pub. Date Apr. 05, 2001. |
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Claims priority of application No. 19992090 (FI), filed on Sep. 29, 1999. | ||
Int. Cl. H04Q 7/20 (2006.01) |
U.S. Cl. 455—436 | 11 Claims |
1. A method for performing a handover where a telecommunications channel used by a connection between a mobile station and
a mobile services switching centre is changed in a mobile communications system where the telecommunications channel consists
of a radio channel connecting the mobile station and a base station and of a channel connecting the base station and the mobile
services switching centre, wherein the method comprises
selecting a new radio channel for the connection in question;
checking whether the handover is an internal handover of the base station controller where the base station employing the
new radio channel and the base station employing the old radio channel are controlled by one and the same base station controller;
checking whether a predetermined trigger condition is met, said condition being met if either the speech coding method or
the data transfer rate changes, or if both the speech coding method and data transfer rate change at the same time, in connection
with the handover; and
directing a switching function located in the mobile services switching centre to perform the handover, provided that the
checks show that the handover is an internal handover of the base station controller where the trigger condition is met, or
alternatively
directing a switching function of the base station controller to perform the handover in question, provided that the checks
show that the handover is an internal handover of the base station controller where the trigger condition is not met.
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