US 6,983,152 B2
Portable telephone system capable of simultaneously carrying out high speed communication and low speed communication by one time slot and communication method therefor
Yoshio Itagaki, Tokyo (Japan)
Assigned to NEC Corporation, Tokyo (Japan)
Filed on Jan. 17, 2002, as Appl. No. 10/46,778.
Claims priority of application No. 2001-008371 (JP), filed on Jan. 17, 2001.
Prior Publication US 2002/0094818 A1, Jul. 18, 2002
Int. Cl. H04Q 7/20 (2006.01)
U.S. Cl. 455—452.1 17 Claims
OG exemplary drawing
 
1. A portable telephone system including a base station and a mobile station which communicate with each other by using one time divisional time slot including a high speed channel and a low speed channel, wherein a first communication requiring said high speed channel by a first calling party from said base station to said mobile station and a second communication not requiring said high speed channel by a second party from said base station to said mobile station are carried out simultaneously by using said high speed channel and said low speed channel, respectively, said base station comprising:
means determining whether or not said high speed channel is empty, when a new service is requested from said base station to said mobile station using said low speed channel;
means assigning said new service to said high speed channel, when said high speed channel is empty;
means determining whether or not said low speed channel is empty, when said high speed channel is not empty;
means determining whether said new service is related to a first communication which requires said high speed channel or a second communication not requiring said high speed channel, when said low speed channel is empty; and
means assigning said new service to said low speed channel, when said new service is related to said second communication.