RB (Radio Bearer)
is a layer 2 connection between the UE and the RNC.
It is used for both control signaling and user data.
RB used for signaling is called an SRB.
RL (Radio Link)
represents
the physical connection between the UE and Node B.
Each RL is defined by its RF frequency, channelization code and scrambling code.
various types of connections that the UE will have with the network:
1. RL
2. RB
3. RAB
4. SRB
5. PDP
6. RRC connection
RL (UE-Node B)
RB (UE-Node B-RNC)
RAB (UE-Node B-RNC-SGSN)
PDP context (UE-Node B-RNC-SGSN-GGSN)
Paging causes:
conversational, streaming, interactive, background, high priority signaling, low priority signaling, cause unknown
MIB value tag, BCCH modification time
Paging record list: a list of paging record up to 8 records.
For each paging record:
for UTRAN originated: u-RNTI, CN-ORIGINATEDPAGE-CONNECTEDMODE-UE, paging cause, CN domain id, paging record type [IMSI, TMSI, P-TMSI]
for CN originated: paging cause, CN domain id (CS or PS), CN paged UE identities (IMSI, TSMI, P-TMSI + value)
Page can be originated
1. UTRAN
or
2. CN
If the UE is in idle mode, then CN will originate the page.
If the UE is in Cell_PCH or URA_PCH, then UTRAN will originate the page.
DRX cycle coefficient is different depending on the state of the UE.
In idle, CN domain has a value for it.
In Cell_PCH, URA_PCH, UTRAN has a value for it.
UTRAN DRX cycle length coefficient: values 3-9: cycle length 80 ms – 5.12 sec
CN domain DRX cycle length coefficient: values 6-9: cycle length 640 ms – 5.12 sec
DRX cycle
defines
the periodicity of the DRX process.
The longer the DRX cycle, the longer the UE is in a sleep state, but the longer the delay before the UE can respond to a paging message.
DRX cycle length = 2^k frames for FDD mode
where k is DRX cycle length coefficient.
The paging occasion
is
the SFN of the frame of which the UE must monitor the PICH to see whether a paging message is being sent to the UE.
For FDD,
paging occasion (SFN) = (IMSI div K) mod (DRX cycle length) + n* DRX cycle length
where n=0, 1, 2, up to a maximu such that SFN is valid [...]
SIB 18
contains PLMN identities for neighboring cells to be considered for use by a UE that is in either idle or connected mode.
