Preparing The Measurements; Handover Overlap Areas: Base Station Synchronization; Traffic Density - Mitel SIP-DECT Site Survey Kit User Manual

- RF interference fields: PCs and other electronic equipment can affect radio
transmission in the vicinity either intermittently or permanently.
- Base stations and DECT phones generate pulsed RF signals. These can affect
sensitive electronic equipment (control systems, measuring sensors, sensors,
diagnostics equipment on intensive- care wards in hospitals, etc.) permanently or
temporarily.
Note: Take note of safety distances and safety regulations. In areas subject to explosion
hazards take note of the relevant rules and regulations.

PREPARING THE MEASUREMENTS

Drawing up a situation plan:
• The situation plan records approximately the number and size of the coverage ranges
required.
• The measurements provide the ideal locations for the base stations.
Radio coverage and area determination
• Make a note of the connection capacity required (number of simultaneous calls) for each
area to determine the number of base stations.
Global coverage in the supply range
• First, ensure that the surface area of the planned supply range is satisfactorily covered. The
ideal locations for the base stations are determined using practical measurements.

HANDOVER OVERLAP AREAS: BASE STATION SYNCHRONIZATION

TDM and IP-Base stations
• To guarantee a seamless handover, the base stations should be fitted in such a way that the
-60dBm overlap area is guaranteed.
• When conducting survey measurements in unfinished buildings, the limits should be
increased by 10dB.
IP-Base stations (sync over air)
• To guarantee synchronisation, you need to arrange the base stations of a cluster in such a
way that there is at least one other base station within the -70 dBm limit! Aim to achieve an
overlap with other base stations (fail-safe setup).
Note: Cluster defines a group of RFPs which synchronise among themselves and
among which a handover is possible; Up to 256 cluster can be set up for each system.

TRAFFIC DENSITY

Once the supply range has been located and covered, the locations for the base stations are
known. In the second phase, you must consider other requirements: traffic volume, determined
by the number of DECT phones; and the frequency and duration of connections in an area defined
by the customer. In most cases, such an area does not match the coverage range of a base
station.
Planning and Site Survey
15