Channel assignment method in mobile communication system in which channel ...

[54] CHANNEL ASSIGNMENT METHOD IN MOBILE COMMUNICATION SYSTEM IN WHICH CHANNEL WHICH MEETS PREDETERMINED CRITERIA IS CHANNEL SELECTED

[75] Inventors: Toshihito Kanai; Kojiro Hamabe, both of Tokyo, Japan

[73] Assignee: NEC Corporation, Japan

[21] Appl. No.: 260,491

[22] Filed: Jun. 15, 1994

Related U.S. Application Data

[63] Continuation of Scr. No. 890,561, May 28, 1992, abandoned.

[30] Foreign Application Priority Data

May 29, 199] |JP| Japan 3-125760

Oct. 17, 1991 |JP] Japan 3-269704

Dec. 26, 1991 |JP] Japan 3-345624

Dec. 26, 1991 |JP| Japan 3-345626

[51] Int. CI." H04Q 7/26

[52] U.S. CI 455/34.1; 455/54.1; 455/62

[58] Field of Search 455/161.1, 166.1,

455/34.1, 33.1, 33.4, 50.1, 54.1, 54.2, 56.1, 62, 63, 67.1, 67.3, 67.6; 379/59

[56] References Cited

U.S. PATENT DOCUMENTS

4,355,411 10/1982 Reudink et al 455/33

4,794,635 12/1988 Hess 379/60

5,093,924 3/1992 Toshiyuki 455/33

5,140,695 8/1992 Yasuda et al 455/238.1

FOREIGN PATENT DOCUMENTS 0419243 3/1991 European Pat. Off. .

0430173 6/1991 European Pat. Off. .

2- 141036 5/1990 Japan.

3- 104329 5/1991 Japan.

OTHER PUBLICATIONS

S. Onoe et al., "Flexible Re-Use for Dynamic Channel Assignment in Mobile Radio System", CH2655-9/89/ , 0000-0472 $1.00 © 1989 IEEE, pp. 472-^176. Kozono et al., "A New Method of Co-Channel D/U Measurement Using Squared Law Envelope Differential Detection", the Institute of Electronics, Information and Communication Engineers, Communication Technical Report, CS83-13, pp. 93-98.

Beck et al., "Strategies for Handover and Dynamic Channel
Allocation in Micro-Cellular Mobile Radio Systems," IEE
Proceedings, vol. 136, pp. 178-185, May 1989.
Zhang et al., IEE Transactions on Vehicular Technology, 38,
Nov. 1989.

Hong et al., IEE Proceedings, vol. 136, pp. 339-346, Oct. 1989.

Primary Examiner—Curtis Kuntz

Assistant Examiner—Philip J. Sobutka

Attorney, Agent, or Firm—Osterlenk, Faber, Gerb & Soffen

[57] ABSTRACT

In a channel assignment method for a mobile communication system, each of base stations respectively arranged in a plurality of cells constituting a service area selects one of all speech communication channels in an order of priority common to all the cells in response to a speech communication request from a mobile station. The base station then checks whether the carrier to interference ratio of the selected speech communication channel is equal to or higher than a predetermined level. The selected channel is assigned as a speech communication channel for the cell when it is determined on the basis of the check result that the carrier to interference ratio is equal to or higher than the predetermined level.

25 Claims, 18 Drawing Sheets