Moby Dick Consolidated System Integration Plan

D0103v1.doc Version 1 6.7.2003
4.3.4.6.3 RRC internal states
The RRC layer implements a state machine. From a macroscopic point of view, the UE can be either in
idle or in connected mode. This mode is known at NAS level.
• idle mode: The Mobile Terminal (UE) is first switched on. Then it enters the “Idle” mode where
it listens to the synchronization channel and then to the BCH. After this first synchronization
phase, the UE is “physically” attached to the RG. It is said to “camp on the cell”. It monitors the
System Information messages broadcasted by the Radio Gateway (RG). When applicable, the
UE RRC forwards the information received to the NAS entities.
The UE enters connected mode on NAS request when data must be transferred between the UE and
the RG. It then continues to monitor the System Information messages.
• connected mode: The UE has established a connection with the Network. This mode is divided
into several states:
o Connected: CELL-DCH
• One or more dedicated physical channel(s) is allocated to the UE
• The UE may monitor FACH for System Info messages
o Connected: CELL-FACH
• No dedicated physical channel, FACH and RACH are used instead
• The UE listens to BCH (Broadcast Channel) for System Information
o Connected: CELL-PCH
• No physical channel is allocated
• The UE is accessible only via the PCH (Paging Channel)
• It listens to System Information on BCH
4.3.4.6.4 RRC procedures and messages
The RRC protocol procedures are detailed in specification [25.331]. The following procedures are
implemented in the Moby Dick framework.
Broadcast of system information
RG → UE - - SYSTEM INFORMATION System Information is broadcasted in System
Information Blocks. The following ones are used:
• SIB type 1 : NAS system information as well as
UE timers and counters to be used in idle mode
and in connected mode
• SIB type 5: parameters for the configuration of the
common physical channels in the cell.
• SIB type 11: measurement control information to
be used in the cell.
• SIB type 18: Identities of neighbouring cells to be
considered in idle mode as well as in connected
mode.
RRC connection establishment
UE → RG - RRC CONNECTION REQUEST
RG → UE - RRC CONNECTION SETUP
UE → RG - RRC CONNECTION SETUP
COMPLETE
RG → UE - RRC CONNECTION REJECT
RRC connection release
UE → RG – RRC UL CONNECTION RELEASE
Initial Direct transfer
UE → RG - INITIAL DIRECT TRANSFER
Downlink Direct transfer
RG → UE - DOWNLINK DIRECT TRANSFER
The purpose of this procedure is to release the RRC
connection including and all radio bearers between the
UE and the Network. By doing so, all established
signalling connections will be released.
The initial direct transfer procedure is used in the
uplink to establish a signalling connection. It is also
used to carry an initial upper layer (NAS) message over
the radio interface
The downlink direct transfer procedure is used in the
downlink direction to carry upper layer (NAS)
messages over the radio interface.
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