ページ1に含まれる内容の要旨
Ericsson Instant Talk
Niclas Medman, Krister Svanbro and Per Synnergren
a groupÑfor instance, a field technician can
Push to talk is a quick and informal way of communicating person-to-person
use it to ask colleagues for help or advice.
and with groups. With a simple push of a button, users can activate voice
EricssonÕs Instant Talk solution complies
communication with friends and familyÑmuch the same way as using
with the PoC specifications. Its users can
walkie-talkies or private mobile radio
ページ2に含まれる内容の要旨
Access network
(GPRS,
CDMA2000
WCDMA) efficiency over the air interface. This prob- Instant Talk
lem has been addressed through signaling application
compression (SigComp), another IETF stan- server dard initiated by Ericsson. SigComp is a ver- satile compression framework that can use any compression algorithm to compress ASCII-based protocols, such as SIP, to a frac- Call/session
control
tion of their original size, reducing both bit function
rate requirements and transport latency. In
ページ3に含まれる内容の要旨
¥ to ensure that the called party is a sub- Ericsson
New service
New service
scriber; Instant Talk
#1
#2
Application
Application
Application
¥ to determine who is to be included in the server server server group during the call; ¥ to determine whether or not users have activated Do-not-disturb mode; and ¥ to check whether the user has activated IPMM manual or auto-answer mode. CSCF The application server also stores and pass- es down rules and regulations to the MRF. HSS Local policies
ページ4に含まれる内容の要旨
frame-bundling feature is supported in the AMR and EVRC payload format. Built-in functionality in the MRF makes it possible to order clients to change the number of frames in an RTP packet to adapt to current network conditions. The MRF employs the RTP control protocol (RTCP) to monitor the network. Standardization The Ericsson Instant Talk solution is based on the PoC industry standard, initially de- veloped by an industry consortium made Figure 3 up of Ericsson, Motorola, Nokia, and Mobile pre
