1xEV-DO Signaling
R&S
®
CMW-KG8xx/-KM8xx/-KS8xx
23
User Manual 1173.9511.02 ─ 11
2.2.5.2
AWGN Generator
Additional White Gaussian Noise (AWGN) is typically modeled in receiver tests,
because it may lead to a decrease of throughput. The quality of the received signal is
affected by the ratio of the signal power to the surrounding traffic noise level (signal to
noise ratio). The modulated signals from neighbor cells simply appear as noise. This
effect is simulated by adding AWGN to the signal.
The internal fading module supports AWGN insertion with configurable noise level.
Insertion loss at the baseband level is calculated and compensated automatically at
the HF.
The properties of the AWGN interferer comply with the requirements of 3GPP2
C.S0032, section 6.4.4 (e.g. minimum bandwidth 1.8 MHz, gain flatness 1.0 dB over
the minimum bandwidth, frequency resolution 1 kHz, output range -20 dBm to -95
dBm).
AWGN insertion via the signaling unit is disabled for fading scenarios (see
2.2.6 Connection States
Connection setup and release between the R&S
CMW and an access terminal is a
step-by-step process. This section describes the connection states and transitions.
Table 2-2: Connection states
State
Description
Off
No 1xEV-DO forward signal transmission
On
The R&S
CMW (access network, AN) emulates a 1xEV-DO sector, transmitting a forward
1xEV-DO signal to which the access terminal can synchronize.
The AT may or may not be synchronized to the forward signal, but no session negotiation
has been performed. Session negotiation must be initiated by the AT.
Session Nego-
tiation
A transitory state where AT and the R&S
CMW try to establish a session and negotiate
the session parameters. This state may take a considerable amount of time.
Session Open
Synchronization and session negotiation have been performed. Applications are assigned
to streams and all connection parameters are negotiated. A session can be active for a
very long time without any further activity.
Paging
A transitory state indicating that the R&S
CMW attempts a connection but no traffic chan-
nel is active yet ("Session Open" --> "Connected"; not shown in the figure below).
Connected
The traffic channel is active and available for the applications that have been assigned to
a stream. All applications are "connected" at the same time.
The R&S
CMW can still vary connection parameters, perform transmitter and receiver
tests, or initiate a dual-band handoff.
Control commands initiated by the R&S
CMW or by the AT switch between the con-
nection states. The following figure shows possible state transitions. Dashed lines cor-
respond to actions initiated by the AT, dotted lines to the ON | OFF key (sector state),
solid lines to the connection control hotkeys (AT state).
General Description
深圳德标仪器
135-1095-0799
