Getting started with the 8378 DECT IP-xBS solution
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5.3 Automatic air synchronization
The DECT base stations transmissions need to be time aligned in order that a DECT
handset can perform roaming and handover between the bases. To achieve time alignment
of xBS, the synchronization by air is used. The xBS can synchronize by air to other xBS
provided that they are close enough to each other (see doc[2])
The air synchronization tree calculation is automatic.
An automatic air synchronization tree can be composed of a maximum of 80 bases
belonging to the same PARI and the same SITE. The tree supports a maximum of 24 levels
(hops).
There is one internal synchronization tree per SITE per PARI.
, the algorithm calculates which xBS is the best to
become the SYNC MASTER at a given instant. When the radio environment changes, the
position of the SYNC MASTER and the shape of the tree may change automatically. The
calculation of the tree is made continuously and the tree changes if we add base stations, or
if a better tree is calculated as a function of the RSSI levels than as a function of the number
of hops. The change of the tree has no impact on the on-going audio communications.
