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Chapter 19 Cellular WAN Status
LTE Series User’s Guide
173
RAC
This displays the RAC (Routing Area Code), which is used in mobile network “packet domain
service” (PS) to identify a routing area within a location area.
In a mobile network, it uses LAC (Location Area Code) to identify the geographical location for
the old 3G voice only service, and use RAC to identify the location of data service like HSDPA or
LTE.
The RAC of the connected UTRAN cell is as defined in SIB 1 [3GPP-TS.25.331]. The concatenation
of PLMN ID (MCC+MNC), LAC, and RAC uniquely identifies the RAI (Routing Area ID) [3GPP-
TS.23.003].
This parameter is for UMTS or GPRS. The value is ‘0’ (zero) if the Current Access Technology is not
UMTS or GPRS. The value is ‘N/A’ if there is no network connection.
BSIC The Base Station Identity Code (BSIC), which is a code used in GSM to uniquely identify a base
station.
This parameter is for GPRS only. The value is ‘0(zero) if the Current Access Technology is not
GPRS. The value is ‘N/A’ if there is no network connection.
SINR This displays the Signal to Interference plus Noise Ratio (SINR) in dB. This is also a measure of signal
quality and used by the UE (User Equipment) to calculate the Channel Quality Indicator (CQI)
that it reports to the network. A negative value means more noise than signal.
CQI This displays the Channel Quality Indicator (CQI). It is an indicator carrying the information on
how good/bad the communication channel quality is.
MCS MCS stands for modulation coding scheme. The base station selects MCS based on current
radio conditions. The higher the MCS the more bits can be transmitted per time unit.
RI This displays the Rank Indication, one of the control information that a UE will report to eNodeB
(Evolved Node-B) on either PUCCH (Physical Uplink Control Channel) or PUSCH (Physical Uplink
Shared Channel) based on uplink scheduling.
PMI This displays the Precoding Matrix Indicator (PMI).
PMI is for transmission modes 4 (closed loop spatial multiplexing), 5 (multi-user MIMO), and 6
(closed loop spatial multiplexing using a single layer).
PMI determines how cellular data are encoded for the antennas to improve downlink rate.
Table 75 System Monitor > Cellular WAN Status (continued)
LABEL DESCRIPTION
173


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