Expert Documentation

Chapter 5
DECT
case
Ordinary
mobility
User profiles Traffic Coverage Principle
Homogeneous
over the entire
site
Low risk, users are
mobile
A final calculation
indicating the capacity
per m² must
be handed over to
the customer
Easy:
Calculate the number
of base stations required
to cover the
site with a ceiling of -
70 dBm (*)
Tricky:
Preliminary coverage
study with measurements
and ceiling of -
60 dBm and quality
level of >=12
Several zones with
different difficulties
Terminals per m²
See coverage in Coverage
Performance
Principles .
Preliminary coverage
study
Apply the previous 2
principles to each
zone
(*): The ceiling recommended for coverage calculation, while maintaining a quality level of >-12
for a DECT network and depending on the type of mobile handset is:
Type of station 4074 4036 DECT Reflexes
Ceiling for easy coverage (fading <
20 dB)
Ceiling for tricky coverage (fading <
20 dB)
- 70 dBm - 70 dBm - 70 dBm
- 60 dBm - 60 dBm - 60 dBm
An additional margin of 10 dB should be taken into account (- 60 dBm and - 50 dBm) in the
case of a request for a Full DECT QoS level close to fixed (wired) line quality.
In addition, be careful and do not apply this rule on specific sites producing cavity type effects
where the resonance effects may corrupt this measurement. In this case, do a specific study.
Case of a Full
DECT optimization
of running
costs
No cost office
moving Homogenous
over the entire
site.
User profiles Traffic Coverage Principle
Calculate the
number of base
stations required
to handle the site
traffic with a margin.
Indicate the
hypotheses.
Easy:
Calculate the number
of base stations
required to cover the
site with a ceiling depending
on the mobile
sets used (use
the least good sets).
Take the highest
number of base
stations from the 2
calculations and
distribute them as
equally as possible
on the site. Take a
5% base stations
margin to add to
cover one-off traffic
situations
5-12