Echo Broadband proprietary

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Mobile originated callMobile originated call

MS

Channel Request (RACH)

BSS MSC

SDCCH Seizure

Immediate Assignment [ Reject ] (AGCH)

CM Service Request + Connection Request < CMSREQ >

Connection [ Confirmed / Refused ]

Link Establishment

Authentication Request

Authentication Response

DT1 <CICMD>Ciphering Mode Command

Ciphering Mode CompleteDT1 <CICMP>

Identity Request

Identity Response

Setup

Call Proceeding

Connection Management

Assignment Request

Assignment Request [ Failed ]

Assignment Command

Assignment [ Complete / Failure ]

Assignment [ Complete / Failure ]

TCH Seizure

SDCCH

TCH

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Echo Broadband proprietary

MS BSS MSC

Paging

SDCCH Seizure

Link Establishment

Paging Request (PCH)UDT < PAGIN >

Paging

Channel Request (RACH)

Immediate Assignment [ Reject ] (AGCH)

Paging Response + Connection Request < PAGRES >

Connection [ Confirmed / Refused ]

Authentication Request

Authentication Response

SDCCH

Ciphering Mode Command

Ciphering Mode Complete

DT1 <CICMD>

DT1 <CICMP>

Identity Request

Identity Response

Setup

Call Confirmed

Connection Management

Assignment Request

Assignment Request [ Failed ]

Assignment Command

Assignment [ Complete / Failure ]

TCH

TCH Seizure

Assignment [ Complete / Failure ]

Mobile terminated callMobile terminated call

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Echo Broadband proprietary

GPRS ARCHITECHURE SUMMARYGPRS ARCHITECHURE SUMMARY

GPRS introduces two new network nodes in the GSM PLMN: The Serving GPRS Support Node (SGSN), which is at the same hierarchical level as the MSC, keeps track of the individual MSs' location and performs security functions and access control. The SGSN is connected to the base station system with Frame Relay. The Gateway GSN (GGSN) provides interworking with external packet-switched networks, and is connected with SGSNs via an IP-based GPRS backbone network. The HLR is enhanced with GPRS subscriber information, and the SMS-GMSCs and SMS-IWMSCs are upgraded to support SMS transmission via the SGSN. Optionally, the MSC/VLR can be enhanced for more-efficient co-ordination of GPRS and non-GPRS services and functionality: e.g., paging for circuit-switched calls that can be performed more efficiently via the SGSN, and combined GPRS and non-GPRS location updates.

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Echo Broadband proprietary

General General

Up to 170kbps

User data is packet switched.

Optimises the Um interface for bursty data traffic.

Quick set up time (~1-2 seconds)

Billing is for data and not connection time

Subscriber is able to remain connected to the network without calling upon any of the networks resources until an actual data transfer takes place.

Timeslot Sharing. Single timeslots - Multiple MSs; Multiple timeslots - Single MS; Multiple timeslots - Multiple MSs

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Echo Broadband proprietary

GENERALGENERALGPRS is one kind of packet-switched data technology which is being developed for GSM networks. This infrastructure will support third generation networks. Initial speeds for GSM will be up to 171kbps. It is expected to be implemented in the 1999-2000 time frame

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Echo Broadband proprietary

Why is packet data technology important?Why is packet data technology important?Because packet provides a seamless and immediate connection from a mobile PC to the Internet or corporate intranet allowing all existing Internet applications such as e-mail and Web browsing to operate smoothly without even needing to dial into an Internet service provider.

The advantage of a packet-based approach is that GPRS only uses the medium, in this case the precious radio link, for the duration of time that data is being sent or received. This means that multiple users can share the same radio channel very efficiently. In contrast, with current circuit-switched connections, users have dedicated connections during their entire call, whether or not they are sending data.

Many applications have idle periods during a session. With packet data, users will only pay for the amount of data they actually communicate, and not the idle time. In fact, with GPRS, users could be "virtually" connected for hours at a time and only incur modest connect charges.

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Packet Data Over Digital CellularPacket Data Over Digital Cellular

Current technologies are primarily circuit-switched, meaning a continuous circuit transmission allows the network to route continuous data to a single location. Circuit-switched data requires a dedicated radio channel even when no data is being sent.

Packet-switched data works quite differently from circuit-switched data. With packet-switched data, the computer that is connected to the cell phone sends and receives bursts, or packets, of data. A radio channel is occupied only for the duration of the data transmission instead of continuously, making it more efficient than circuit-switched.

Since the phone never makes an actual "phone call," the channel becomes immediately available for other data users after the transmission. At the switching center, packet services interconnect with the Internet or directly with corporate intranets using traditional networking methods such as frame relay.

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Echo Broadband proprietary

Applications for GPRSApplications for GPRS WWW

E- mail

Electronic Cash - smart cards

Electronic Commerce Telematics - Vending Machines, Toll Collection Field Services - UPS

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Echo Broadband proprietary

GPRS vs HSCSDGPRS vs HSCSD

GPRSGPRS

High initial costs (new Network elements)

Low per user cost Economies of Scale

HSCSD HSCSD

Lower speed - up to 57.6 KBps (4 * 14.4)

Low initial costs

High per user cost

Handover issues

No economies of scale

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Echo Broadband proprietary

What does UMTS give us and Why use it?What does UMTS give us and Why use it?

What ?What ?

Higher Bit Rates (up to 2Mb/ sec)

Improved services quality (comparable to fixed)

Why ?Why ?

Multimedia (Video, Sound, Text, Graphics)

Single terminal - mobile, office & domestic

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Options for the Support of Mobile DataOptions for the Support of Mobile Data

GPRS - General Packet Radio Service

HSCSD - High Speed Circuit Switched Data

UMTS - Universal Mobile Telecommunications System

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Echo Broadband proprietary

GPRS vs UMTSGPRS vs UMTS

• Complementary, NOT competing technologies

• GPRS will be a stepping stone to a UMTS

• Operators can reuse GPRS infrastructure in UMTS