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United States Patent im

Raith et al.

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US005768267A

[ii] Patent Number: [45] Date of Patent:

5,768,267 Jun. 16, 1998

[54] METHOD FOR SYSTEM REGISTRATION AND CELL RESELECTION

[75] Inventors: Alex Krister Raith. Durham; John

Diachina. Garner; Raymond C. Henry. Wake Forest; Steven Prokup. Cary, all of N.C.; Lars Bilstrom, Solna; Karl-Erik Andersson. Stockholm, both of Sweden; Alan Eric Sicher. Garland. Tex.; Laura E. Bohaychuk. Apex. N.C.

[73] Assignee: Telefonaktiebolaget LM Ericsson.

Stockholm. Sweden

[21] Appl. No.: 544,488
[22] Filed: Oct. 18, 1995

[51] Int CI.6 H04Q 7/00; H04Q 7/22

[52] U.S. CI 370/329; 370/337; 455/434;

455/435

[58] Field of Search 370/326. 329,

370/337. 344. 349. 442. 331. 328. 345. 347, 436. 496. 522; 379/59. 60: 455/33.2. 422. 433. 434. 435. 450. 455, 464. 466

[56] References Cited

U.S. PATENT DOCUMENTS

4,887,265 12/1989 Felix .

4,916,691 4/1990 Goodman .

5,119,397 6/1992 Dahlin et al. .

5.175,867 12/1992 Wejke et al. .

5,353,332 10/1994 Raith et al. .

5,502,721 3/1996 Pohjakallio 370/336

5,515,374 5/1996 Atkinson 370/433

5,530,693 6/1996 Averbuch 370/331

5,590,133 12/1996 Bfflsttom 370/349

FOREIGN PATENT DOCUMENTS

332818 9/1989 European Pat. Off. . WO95/16330 6/1995 WIPO . WO95/28063 10/1995 WIPO .

OTHER PUBLICATIONS

"Cellular System Dual-Mode Mobile Station—Base Station
Compatibility Standard". EIAJT1A Interim Standard,
IS-54-B, pertinent pages only. Apr. 1992.
K. Felix. "Packet Switching in Digital Cellular Systems",
Proc. 38th IEEE Vehicular Technology Conf, pp. 414-418.
Jun. 1988.

P. Decker et al., "A General Packet Radio Service Proposed
for GSM", GSM in a Future Competitive Environment,
Helsinki. Finland, pp. 1-20. Oct. 13. 1993.
P. Decker, "Packet Radio in GSM", European Telecommu-
nications Standards Insitute (ETSi). T Doc SMG 4 58/93.
pp. 1-13. (odd pages only). Feb. 12. 1993.

Primary Examiner—Wellington Chin
Assistant Examiner—Soon-Dong Hyun
Attorney, Agent, or Firm—Burns, Doane.
Mathis. L.L.P.

Swecker &

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