4,818,998 4,819,860 4,868,376 4,884,132 4,891,638 4,891,650 4,903,212 4,907,159
4,910,767 4,939,662 4,952,928 4,972,484 4,980,913 4,999,783 5,014,040 5,014,206 …

(57) ABSTRACT A system for exchanging GPS or other position data between wireless
devices for purposes of group activities, child loca tion monitoring, work group coordination …

Techniques to support emergency voice-over-Internet Pro tocol (VoIP) calls are described.
The techniques may be used for various 3GPP and 3GPP2 networks, various location …

A system for exchanging GPS or other position data between wireless devices for purposes
of group activities, child location monitoring, work group coordination, dispatching of …

Related US Application Data Continuation of application No. 13/889,132, filed on May 7,
2013, which is a continuation of application No. 12/075,408, filed on Mar. 11, 2008, now Pat …

(57) ABSTRACT A system for exchanging GPS or other position data between wireless
devices for purposes of group activities, child loca tion monitoring, work group coordination …

Techniques for performing registration in parallel with call establishment to reduce delay are
described. A user equip ment (UE) performs registration with a communication network, eg …

(57) ABSTRACT ESQK and/or ESRK (ESXK) number pool exhaustion and reuse errors are
eliminated by replacing the ESXK identifier with an emergency services pseudo key (ESPK) …

Techniques to support emergency circuit-mode calls are described. The techniques may be
used for various 3GPP and 3GPP2 networks, various location architectures, and various …

(57) ABSTRACT A system for exchanging GPS or other position data between devices for
purposes of group activities, child location moni toring, work group coordination, dispatching …