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9
SAILOR FleetBroadBand
Training Manual
1
RAN Host
, which has the RNS (Radio Network Station central
control roles of both resource (HW and SW) allocation and control
Bearer Service provision.
GRM
(Global Resource Manager): Handles Carrier resource
allocation.
CUE
(Channel Unit Equipment) that consists of:
PU
(Patch Unit),
MCU
(Master Channel Unit), Rx and Tx Channel Units (CU).
MCU
(Master Channel Unit): Terminating and handling of IAI-2
interface protocol, IAI-2 interface signalling and takes care of some
essential functions of UE traffic setup. Handling of SIB (System
Information Broadcast), Control ciphering, Authentication, Integrity
check, UE position, Link adaptation, Load report, Radio resource
management, user plane interface to CNGW, and control plane
interface to RAN Host.
CU
(Rx and Tx Channel Units), which take care of data and
signalling transmission and reception from RF to RNS.
The TX/RX CU is responsible of the following functions:
•
Build and pack up the control PDU.
•
Transmit physical frames made by the Bearer Control layer.
•
Calculation of CRC.
•
Frame timing Generation (TX only).
•
Collect status/Statistic data.
•
Control of RF up/down-converter, RAN Host that has the RNS
central control roles of both resource (HW and SW) allocation
and control Bearer Service provision.
CNGW
(Core Network Gateway), which has responsibly of
connection toward CN, handling of RANAP protocol, setup and
release IU signalling and RABs CNGW functions as a gateway
from RNC to UMTS Core Network. It takes care of:
•
Terminating Iu connection for both CS and PS UE user plane
toward CN MSC (in case of CS connection) and SGSN (in case
of PS connection).
•
ATM connection toward CN.
•
Mapping RANAP operations/messages into RNC internal (LAN)
operations/messages and vice versa.
Содержание Sailor 250 FleetBroadband
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Страница 34: ...24 1 Chapter 1 Inmarsat Network Figure 1 34 Return direction connection bearers ...
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