WILLTEK 4400 Mobile Phone Tester Series, Руководство пользователя

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Chapter 5 EDGE Asynchronous Mode Operation
Parameter menus
198
4460 GSM System Option and 4468 EDGE System Option Version 12.20
The following Parameter menus are available:
– Basic parameters
– Power/time templates (PTT) (see page 98 )
– Measurement limits (see page 101 )
– Coupling loss (see page 133 )
– Corner points (see page 106 )
Basic parameters
The figure below shows the Basic Parameter menu.
The Basic parameter menu is divided into the following sections:
– The GSM Micro Cell Simulation section provides access to the GSM system
parameters broadcast in the System Information messages. The parameter
fields are identical to those in the GSM environment (see
“Basic system
parameters” on page 93 ).
– The GPRS Micro Cell Simulation section provides access to GPRS system
parameters broadcast in the System Information messages, especially SI13.
– The Header Fields section defines MAC or RLC header parameter values.
Input parameters The input parameters to be entered in the GPRS Micro Cell Simulation and
Header Fields sections are listed below. These apply when the RF generator is set
to transmit a typical GPRS signal with BCCH and packet data channel.
GPRS Micro Cell Simulation section
RA Color — Sent in the SI3 and SI4 Rest Octets. The normal use is that different
different RA Color codes in adjacent cells indicate to the mobile that the cells
belong to different Routing Areas. The valid range is 1…7.
RA Code — The Routing Area Code as broadcast in the SI13 Rest Octets. The
valid range is 0…255.
Alpha — One of the GPRS Power Control Parameters (SI13 Rest Octets) sent also
in the IA Rest Octets and RR Packet Uplink Assignment. Alpha is the coded
parameter Alpha involved in the equation below. Valid entries 0…10 correspond
to Alpha = 0.0…1.0, default is 10. When the mobile station transmits on a PDCH,
it uses the parameter Alpha to determine its output power level Pn of the n-th
burst within TDMA frame as follows:
Pn = min[Gamma
0
- Gamma
CH
- Alpha(C + 48),P
max
]
where Gamma
0
= 39 dBm for GSM 900 and Gamma
0
= 36 dBm for GSM 1800/
1900, Gamma
CH
is defined for each PDCH individually (e.g. during channel
assignment), Alpha is defined above, C is the power level of the basis station
received by the mobile, and P
max
is the maxim output power of the mobile
according to its power class.
Header Fields section — The entries in some of the GPRS header fields are user-
selectable; for each TDMA frame, one PDTCH time slot is coded and duplicated
into all time slots containing the PDTCH.