White Paper W950

Preliminary version - PA4

 

 

 

Performance requirements

(for instance to support multimedia), then it is

 

 

preferable to handover one PDP context, rather

 

 

than dropping all of them.

 

Temporary degradation of service caused by

 

 

 

handover

 

As a first priority only the PDP contexts which have

During intra-UMTS Radio Access Network

an associated QoS that can be supported by the

handover or handover from UMTS Radio Access

GSM/GPRS should be candidates for handover.

Network to GSM/GPRS, degradation of service

If there are still multiple PDP contexts as “handover

should be no greater than during intra-GSM/GPRS

handover. The duration of the discontinuity

candidates”, then the operator should choose

experienced by packet switched and circuit

which PDP is maintained. When roaming, the

switched real time services should be shorter than

serving network should make this decision. The

that in the handover of voice calls over GSM/

operator may choose to either:

GPRS.

 

 

 

y

 

 

 

 

 

 

• Drop all of the PDP contexts.

 

 

 

l

 

 

• Choose one based upon criteria such as dura-

Requirements on multiple bearer services

 

On

 

tion, amount of traffic transferred, etc.

handover from UMTS radio access network to

 

 

 

GSM/GPRS

 

Handover in W950

Consideration must be given to services that may

This phone is compliant with the 3GPP R99

involve multiple bearer services (and simultaneous

December 2002 release.

 

sessions). The mapping between UMTS Radio

 

 

 

 

Access Network bearer services and GSM/GPRS

 

 

 

bearer services depends on many factors such as

GSM to UMTS

 

data rate, delay constraints, error rate etc. In the

e

 

 

 

 

The product supports circuit switched voice

event that certain UMTS Radio Access Network

handovers from GSM to UMTS.

bearer services cannot be handed over to GSM/

 

 

 

GPRS, the handover of some of the bearers to

 

 

 

 

ternal

UMTS to GSM/GPRS

 

maintain the service should not be precluded.

U

 

 

In the case where a user equipped with a dual

The product supports packet switched data

handover and circuit switched voice handover from

mode terminal is in UMTS Radio Access Network

UMTS to GSM/GPRS.

 

coverage, and has multiple PDP contexts activated

 

 

 

 

n

 

 

 

 

I

 

 

 

Positioning

 

 

 

or

 

applications. Typically SMS or voice has been used

The basic cost efficient positioning method

available in 3G networks relies on measuring

as delivery mechanisms. Java™ and MMS will add

round-trip time. In 3G it is called Cell-ID + TA

new possibilities to deliver attractive location-

(TimingFin Advance).

based applications.

 

Time difference measurement, involving several base stations, can be used to obtain a more accurate position.

Positioning methods are already used to support location-based information services such as

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June 2006