Ericsson CDMA2000 دليل المستخدم

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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

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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

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¥ 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

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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