Nortel Networks DCT1900 Start of Registration, Registration Successful, Registration Failures

Technical Product Manual - DCT1900

System Description, System Overview

will still synchronize slaves connected to it, effectively forming a separate "sub cluster" within which seamless handovers are still possible.

The delay in the cable used to synchronize the REs must be measured and entered into each of the slave REs. The accuracy of this delay measurement is very important and must be taken with care.

Registration

Registration entails the Portable Telephone establishing a link with the RE/MS, whereby the Portable Telephone tells the RE/MS who it is, i.e. extension number, system number range, home node number, and the RE/MS authorizes the Portable Telephone to use its resources to make and receive calls.

In the case of a DCT1900 mobility configuration with multiple Mobility Servers:

zIf the MS is not the Home MS, then there must be a physical connection (QSIG Tie Line) between the Home MS and the MS the phone is trying to register to.

zThe Portable Telephone’s PUN and authentication key must be known by its’ home MS.

zThe system number of the RE must be within the system range initialized in the Portable Telephone.

Start of Registration

Registration starts whenever:

zThe Portable Telephone is switched on and sees a system (within the allowed system range).

zWhen the Portable Telephone sees a system with better receive signal strength quality than the current one which is also in its system range (the Portable Telephone will roam to another system).

zThe system asks the Portable Telephone to do so (initiated by the RE/MS). This function updates databases which may contain corrupted data (e.g. after restarts of system or RE/MS).

Note:

When a Portable Telephone goes out of range and comes back in range of the same RE, the registration procedure will not be repeated.

Registration Successful

If all requirements are met, the registration will succeed. Note that this dynamic behavior means that only at this point will a Portable Telephone be registered in a system. There will never be a fixed relation between a system and a PUN!

Registration Failures

The registration process may result in a rejection from the RE/MS. If the PUN of the Portable Telephone is not initialized in the RE/MS or when the authentication keys in the Portable Telephone and RE/MS are different, the Portable Telephone will be rejected. The result will be that the Portable Telephone will not try again. Only when the Portable Telephone is switched off and on again, or searched by the RE/MS or by the system, will it try to register again.

The process can also fail because of other reasons. For example, when a connection set–up failed or when congestion occurred in a particular Base Station RE/MS, the registration process will automatically start again after some time.

When a Portable Telephone moves from a RE where it was registered to a new RE and the registration fails on that new RE, it will still be registered in the RE where it came from.

System-DCT1900/R8/mw	2-7
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