c04 wcdma rno paging procedure
TRANSCRIPT
-
8/10/2019 C04 WCDMA RNO Paging Procedure
1/22
WCDMA RNO Paging Procedure
-
8/10/2019 C04 WCDMA RNO Paging Procedure
2/22
Review
Paging is one of the most important procedures in
WCDMA.
Paging is critical factor associated with the callsetup success rate of the network.
-
8/10/2019 C04 WCDMA RNO Paging Procedure
3/22
Objectives
Know the detailed paging
procedure in UMTS
Know how to optimize the
paging procedure
Upon completion of this course,you will be able to:
-
8/10/2019 C04 WCDMA RNO Paging Procedure
4/22
Course Contents
Paging initiation
Paging Type
UE DRX procedure
Paging parameters optimization
-
8/10/2019 C04 WCDMA RNO Paging Procedure
5/22
Paging initiation
The network will initiate paging in the following three cases:
Mobile terminating call
UTRAN system information update
UE state transitions
-
8/10/2019 C04 WCDMA RNO Paging Procedure
6/22
Mobile terminating call
UE NAS UE AS NSS MSC
paging
AUTHENTICATION REQUEST
AUTHENTICATION RESPONSE
RR_SECURITY_CONTROL_REQ
(IK CK)
security mode control
SETUP
CALL CONFIRM
ALERT
CONNECT
CONNECT ACKNOWLEDGE
RAB setup procedure
paging
RR_EST_REQ (PAGING RESPONSE)
RR_PAING_IND
INITIAL_DIRECT_TRANSFER
(PAGING RESPONSE)
RANAPRANAP
RRC setup procedure
-
8/10/2019 C04 WCDMA RNO Paging Procedure
7/22
UTRAN system information update
When cell system information changed, paging type 1 is used
to inform mobile to read the updated system information. It is
special for the mobile in IDLE mode, CELL PCH and URA
PCH .
UE RNCNodeB
Cell system information changed
RRC
RRC
RRC
System information update request
RRCPaging type 1
RRC
RRC System information update response
-
8/10/2019 C04 WCDMA RNO Paging Procedure
8/22
UE state transitions
Establish RRCConnection
Release RRCConnection
UTRA RRC Connected Mode
UTRA:Inter-RAT
Handover
GSM:Handover
Establish RRCConnection
Release RRCConnection
URA_PCH CELL_PCH
GSM
ConnectedMode
Establish RRConnection
Release RRConnection
Idle Mode
Camping on a UTRAN cell1 Camping on a GSM / GPRS cell1
GPRS Packet Idle Mode1
GPRSPacket
Transfer
Mode
Initiation of
emporarylock flow
Release of
emporarylock flow
Cell reselection
CELL_DCH
out ofservice
inservice
CELL_FACH
out ofservice
inservice
out ofservice
inservice
When UTRAN wants mobile to change its state from CELL PCH or
URA PCH to CELL FACH, UTRAN will send paging type 1 to
mobile.
-
8/10/2019 C04 WCDMA RNO Paging Procedure
9/22
Course Contents
Paging initiation
Paging Type
UE DRX procedure
Paging parameters optimization
-
8/10/2019 C04 WCDMA RNO Paging Procedure
10/22
Paging type 1
When receiving paging from core network, UTRAN decides
the paging type.
When mobile in IDLE mode, CELL PCH and URA PCH,
UTRAN will send paging type 1 on PCCH.
UE Node B
1.1
Node B
2.1
RNC
1
RNC
2
CN
RANAPRANAP1. Paging
2. PCCH: Paging Type 1
RANAP RANAP1. Paging
3. PCCH: Paging Type 1
-
8/10/2019 C04 WCDMA RNO Paging Procedure
11/22
Paging type 2
UE Serving
RNC
CN
RRCRRC2. DCCH: Paging Type 2
RANAP RANAP1. Paging
Paging type 2 for a UE in RRC Connected Mode (CELL_DCH
and CELL_FACH states) on DCCH.
-
8/10/2019 C04 WCDMA RNO Paging Procedure
12/22
Course Contents
Paging initiation
Paging Type
UE DRX procedure
Paging parameters optimization
-
8/10/2019 C04 WCDMA RNO Paging Procedure
13/22
DRX
The UE may use Discontinuous Reception (DRX) in order to reduce power
consumption. When DRX is used the UE needs only to monitor one Page
Indicator, PI, in one Paging Occasion per DRX cycle.
In FDD mode, DRX cycle length = 2^k, k is DRX cycle length coefficient.
The UE shall store each CN domain specific DRX cycle length for each CN
domain the UE is attached to and use the shortest of those DRX cycle
lengths.
The CS CNspecific DRX cycle length coefficient shall be updated locally in
the UE using information given in system information.
The PS CNspecific DRX cycle length coefficient shall be updated after the
negotiation between the UE and PS CN by NAS procedure.
-
8/10/2019 C04 WCDMA RNO Paging Procedure
14/22
Paging Occasion
0
2^K-1
0 4095
P I P I P I P I
0 1 q NP-1
one pagingoccasion
Paging Occasion = {(IMSI div K) mod (DRX cycle length div PBP)}
* PBP + n * DRX cycle length + Frame Offset, Where n = 0,1,2 as long asSFN is below its maximum value. K is the number of SCCPCH bears the PCH.
In FDD mode, Paging Occasion = IMSI mod 2K + n*2K
-
8/10/2019 C04 WCDMA RNO Paging Procedure
15/22
Paging Indicator Channel (PICH)
b1b0
288 bits for paging indication12 bits (transmission
off
One radio frame (10 ms)
b287 b288 b299
One PICH radio frame of length 10 ms consists of 300 bits (b0, b1, , b299). Of
these, 288 bits (b0, b1, , b287) are used to carry paging indicators.
In each PICH frame, Np paging indicators {P0, , PNp-1} are transmitted, where
Np=18, 36, 72, or 144.
The PI calculated by higher layers for use for a certain UE, is associated to the
paging indicator Pq. PI = DRX index mod NP= (IMSI div 8192) mod NP
If a paging indicator in a certain frame is set to "1" it is an indication that UEs
associated with this paging indicator and PI should read the corresponding frame of
the associated S-CCPCH.
NpNpSFNSFNSFNSFNPIq mod144144mod512/64/8/18
-
8/10/2019 C04 WCDMA RNO Paging Procedure
16/22
Mapping of paging indicators Pq to PICH bits
Number of paging
indicators per frame (Np)
Pq= 1 Pq= 0
Np=18 {b16q, , b16q+15} = {1,
1,, 1}
{b16q, , b16q+15} = {0,
0,, 0}
Np=36 {b8q, , b8q+7} = {1, 1,,
1}
{b8q, , b8q+7} = {0, 0,,
0}
Np=72 {b4q, , b4q+3} = {1, 1,,
1}
{b4q, , b4q+3} = {0, 0,,
0}
Np=144 {b2q
, b2q+1
} = {1, 1} {b2q
, b2q+1
} = {0, 0}
-
8/10/2019 C04 WCDMA RNO Paging Procedure
17/22
Random access procedure
The PICH timing is PICH = 7680 chips prior to its corresponding
S-CCPCH frame timing, i.e. the timing of the S-CCPCH carrying
the PCH transport channel with the corresponding paging
information
PICH
Associated S-CCPCH frame
PICH frame containing paging indicator
-
8/10/2019 C04 WCDMA RNO Paging Procedure
18/22
Course Contents
Paging initiation
Paging Type
UE DRX procedure
Paging parameters optimization
-
8/10/2019 C04 WCDMA RNO Paging Procedure
19/22
Paging Cycle Coefficient
In the idle mode, the UE can receive the paging indication with DRX to reducethe power consumption. At this time, the UE needs to detect only one paging
indication in a paging occasion within a DRX cycle. The DRX cycle length of
UTRAN domain is obtained by substituting this parameter into the formula
DRXcycle = 2KPBP frames. Where, K is [the paging cycle coefficient],
and PBP is the paging block cycle coefficient (In the FDD mode, PBP = 1).
Influence on the network performance: If this parameter is set too small,
the UE will detect the paging channel frequently, and thus the battery is
consumed fast; if it is set too big, the UE will react very slowly on the paging,
it will also occur that the system repeats the UE paging, and the downlink
interference will be increased.
-
8/10/2019 C04 WCDMA RNO Paging Procedure
20/22
Np
Np is the number of paging indicators per frame. The value
range of this parameter is 18, 36, 72, or 144.
Influence on the network performance:
PI = DRX index mod NP= (IMSI div 8192) mod N
P.
All of the IMSIs is divided into Np groups. If this parameter is
set too small, for one IMSI, the paged probability of this IMSI
will increase and it will consume too much power. If this
parameter is set too big, the paged probability will decrease.
The bit number of each PI decrease too, and it requests high
demodulation performance for UE.
-
8/10/2019 C04 WCDMA RNO Paging Procedure
21/22
Summary
Paging initiation occasions: Mobile terminating call, UTRAN
system information update, UE state transitions.
Paging type: paging type 1 and paging type 2.
UE DRX procedure: UE may monitor the corresponding PI inevery paging cycle.
Parameters optimization: Paging Cycle Coefficient and Np.
-
8/10/2019 C04 WCDMA RNO Paging Procedure
22/22