Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-10-30
2007-10-30
Kincaid, Lester G. (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S459000, C455S518000, C455S519000, C455S517000, C455S509000, C455S450000, C370S352000
Reexamination Certificate
active
10998340
ABSTRACT:
A method of setting up a Push-To-Talk-over-Cellular (PoC) call between a calling mobile station (MS) and a called MS in a cellular communications network. In GSM/GPRS networks, the method decreases the call setup time, from the time the push-to-talk button is pressed, by causing the called MS to change to READY state before call setup is initiated. This is done by sending a USSD message to the called MS when the calling user selects a PoC contact list on the calling MS. The USSD message causes the called MS to perform a routing area update and change to READY state. This eliminates the need to page the called MS during call setup. In WCDMA networks, the USSD message causes the called MS to reestablish a Radio Resource Control (RRC) connection. The called MS maintains this connection, thereby enabling faster type 2 paging to be utilized for call setup.
REFERENCES:
patent: 2003/0148779 (2003-08-01), Aravamudan et al.
patent: 2004/0121791 (2004-06-01), May et al.
patent: 2005/0141471 (2005-06-01), Virtanen et al.
patent: 2 290 196 (1995-12-01), None
3GPP TS 23.141, V6.7.0 (Sep. 2004) Technical Specification; 3rdGeneral Partnership Project; Technical Specification Group Services and System Aspects; Presence Service; Architecture and Functional Description (Release 6).
3GPP TR 23.841, V6.0.0 (Jul. 2002 Technical Specification; 3rdGeneral Partnership Project; Technical Specification Group Services and System Aspects; Presence Service; Architecture and Functional Description (Release 6).
ETSI TS 122.141, V5.2.0 (Mar. 2002) Technical Specification; Universal Mobile Telecommunications System (UMTS); Presence Service; Stage 1 (3GPP TS 22.141 Version 5.2.0 Release 5).
Ekong Emem
Kincaid Lester G.
Telefonaktiebolaget LM Ericsson (publ)
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