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Huawei WCDMA RAN14 State Transition
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www.huawei.com
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA RAN14 State
Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page2
Foreword
UE with different service type and traffic volume will occupy
differentiated resource. It is necessary to control UE behavior,
in purpose of optimizing system resource.
State transition is built on DCCC mechanism
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page3
Objectives
Upon completion of this course, you will be able to:
Outline state transition categories
Describe the realization method of state transition
Perform the parameter adjustment of state transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page4
Contents
1. UE State Transition Overview
2. Basic UE State Transition Description
3. UE State Transition Application
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
UE State Transition in UTRAN
Connected Mode
Page5
CELL_DCH CELL_FACH
CELL_PCH URA_PCH
IDLE
UTRAN Connected Mode
Establish RRC
Release RRC
Establish RRC
Release RRC
4b+timer/overload
4a
4b+timer
Paging/Data
Paging/Data
Cell reselection (Timer+Counter)
Smart P2D
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page7
See comment
UE State Transition Types
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page8
UE State Transition Switches
Switches Description
DRA_PS_BE_STATE_TRANS_SWITCH Controls state transition for UEs performing BE
services
DRA_PS_NON_BE_STATE_TRANS_SWITCH Controls state transition for UEs performing non-
BE services
DRA_HSDPA_STATE_TRANS_SWITCH Controls state transition from HS-DSCH to FACH
DRA_HSUPA_STATE_TRANS_SWITCH Controls state transition from E-DCH to FACH
DRA_SMART_FAST_STATE_TRANS_SWITCH
Controls identification of UEs capable of fast
state transition, and fast state transition from
CELL_DCH to CELL_PCH, URA_PCH, or
CELL_FACH
DRA_PCH_UE_SMART_P2D_SWITCH Controls fast state transition from CELL_PCH or
URA_PCH to CELL_DCH
DRA_F2U_SWITCH Controls state transition from CELL_FACH to
URA_PCH directly
SET UCORRMALGOSWITCH (DraSwitch) defines the following RNC-level
switches for dynamic resource allocation
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page9
UE State Transition Switches(Cont.)
Switches Description
RNC_U2U_SWITCH Controls state transitions to URA_PCH after a cell
update initiated in the URA_PCH state
SET URRCTRLSWITCH (ProcessSwitch3) defines the RNC-level switch for
state transitions from the URA_PCH state to the URA_PCH state.
ADD UCELLDCCC (DraSwitch) defines the cell-level switches for fast state
transition.
Switches Description
DRA_SMART_FAST_STATE_TRANS_SWITCH
Controls identification of UEs capable of fast
state transition, and fast state transition from
CELL_DCH to CELL_PCH, URA_PCH, or
CELL_FACH
DRA_PCH_UE_SMART_P2D_SWITCH Controls fast state transition from the
CELL_PCH or URA_PCH to CELL_DCH state.
BE_4A_THD_ADJ_FOR_FACH_CONG_SWITCH
Controls the setting of the cell-level event 4A
threshold. For cells with FACH congestion, the
cell-level event 4A threshold can be set to a
small value to relieve FACH congestion.
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page10
Contents
1. UE State Transition Overview
2. Basic UE State Transition Description
3. UE State Transition Application
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page11
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page12
CELL_DCH to CELL_FACH
UE state transition from CELL_DCH to CELL_FACH:
Transport channel
traffic volume
Time to trigger
Pending Time after trigger
Report
event 4b
Time
DCH to FACH transition time
Report
event 4bDCH to FACH transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page13
CELL_DCH to CELL_FACH (Cont.)
The CELL_DCH to CELL_FACH transition threshold is the
rounded-down value obtained according to the following
formula:
CELL_DCH to CELL_FACH transition threshold = [CELL_DCH to
CELL_FACH transition time/(Time to trigger + Pending time after
trigger) x State transition traffic redundancy coefficient]
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page14
CELL_DCH to CELL_FACH (Cont.)
Service Type
CELL_DCH to
CELL_FACH Transition
Timer
Threshold of
Event 4b Time to Trigger
Pending Time After
Trigger
BE service on
the DCH BeD2FStateTransTimer D2F2PTvmThd D2FTvmTimeToTrig D2FTvmPTAT
BE service on
the HS-DSCH BeH2FStateTransTimer BeH2FTvmThd BeH2FTvmTimeToTrig BeH2FTvmPTAT
Real-time
service in the
PS domain
RtDH2FStateTransTimer RtDH2FTvmThd RtDH2FTvmTimeToTrig tDH2FTvmPTAT
BE service on
the E-DCH BeE2FStateTransTimer E2FThrouThd
E2FThrouTimeToTrig
x E2FThrouMeasPeriod
E2FThrouPTAT x
E2FThrouMeasPeriod
Parameters of event 4b for CELL_DCH to CELL_FACH:
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page15
D2F Transition Parameters
Parameter Parameter name Recommended
value
BeD2FStateTransTimer BE DCH to FACH Transition
Timer 5s
D2F2PTvmThd BE D2F/R Or F/R2P 4B
Threshold 128bytes
D2FTvmTimeToTrig BE D2F/R 4B Time 5000ms
D2FTvmPTAT BE D2F/R 4B Pending Time 1000ms
BE service on the DCH:
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page16
Parameter Parameter name Recommended
value
BeH2FStateTransTimer BE HS-DSCH to FACH
Transition Timer 5s
BeH2FTvmThd BE HS-DSCH2F 4B Threshold 128bytes
BeH2FTvmTimeToTrig BE HS-DSCH2F 4B Time 5000ms
BeH2FTvmPTAT BE HS-DSCH2F 4B Pending
Time 1000ms
BE service on the HS-DSCH:
D2F Transition Parameters(Cont.)
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page17
D2F Transition Parameters(Cont.)
Parameter Parameter name Recommended
value
RtDH2FStateTransTimer Realtime DCH or HSPA To
FACH Transition Timer 180s
RtDH2FTvmThd RT D/HSPA2F 4B Threshold 64bytes
RtDH2FTvmTimeToTrig RT D/HSPA2F 4B Time 5000ms
RtDH2FTvmPTAT RT D/HSPA2F 4B Pending
Time 16000ms
Real-time service in the PS domain:
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page18
D2F Transition Parameters(Cont.)
Parameter Parameter name Recommended
value
BeE2FStateTransTimer BE E-DCH To FACH State
Transition Timer 2s
E2FThrouThd E-DCH2F 4B Threshold 8kbit/s
E2FThrouMeasPeriod E-DCH Throu Meas Period 300ms
E2FThrouTimeToTrig E-DCH2F 4B Period Amount 2
E2FThrouPTAT E-DCH2F 4B Pending Period
Amount 4
BE service on the E-DCH:
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page19
D2F Transition Parameters(Cont.)
LittleRateThd
Parameter name: Low Activity Bit Rate Threshold
Recommended value: D64, namely 64kbit/s
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page20
Optimization of H2F State Transition
The CELL_DCH(HS-DSCH) to CELL_FACH transition
Transport channel
traffic volume
Time to trigger
Pending Time after trigger
Report
event 4b
Time
DCH to FACH transition time
Report
event 4bDCH to FACH transition
Report
event 4a
4a threshold
4b threshold
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page21
Parameters of Optimized H2F Switch
PERFENH_H2F_OPT_SWITCH
Parameter name: PERFENH_H2F_OPT_SWITCH
Recommended value: PERFENH_H2F_OPT_SWITCH-OFF
PerfEnhanceSwitch
Optimized H2F switch
is under parameter
PerfEnhanceSwitch
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page22
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page23
CELL_FACH to CELL_PCH
UE state transition from CELL_FACH to CELL_PCH is applicable
to BE services in the PS domain
UE state transition from CELL_FACH to CELL_PCH is similar to
UE state transition from CELL_DCH to CELL_FACH
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page24
CELL_FACH to CELL_PCH (Cont.)
The CELL_FACH to CELL_PCH transition threshold is the
rounded-down value obtained according to the following
formula:
CELL_FACH to CELL_PCH transition threshold = [CELL_FACH to
CELL_PCH transition time/(Time to trigger + Pending time after
trigger) x State transition traffic redundancy coefficient]
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page25
CELL_FACH to CELL_PCH (Cont.)
Service
Type
CELL_DCH to
CELL_FACH Transition
Timer
Threshold of
Event 4b Time to Trigger
Pending Time After
Trigger
BE service
in the PS
domain
BeF2PStateTransTimer D2F2PTvmThd F2PTvmTimeToTrig F2PTvmPTAT
Parameters of event 4b for CELL_FACH to CELL_PCH:
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F2P Transition Parameters
Parameter Parameter name Recommended
value
BeF2PStateTransTimer BE FACH to PCH Transition
Timer None
D2F2PTvmThd BE D2F/R Or F/R2P 4B
Threshold 128bytes
F2PTvmTimeToTrig BE F2P 4B Time 5000ms
F2PTvmPTAT BE F2P 4B Pending Time 16000ms
BE service on the DCH:
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page27
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page28
F2U State Transition
F2U state transition applies to BE services in the PS domain.
The trigger conditions, parameter settings and signaling
procedure for F2U state transitions are the same as those for
F2P state transitions.
F2U state transitions are preferentially triggered than P2U when
the conditions are met, if the switch DRA_F2U_SWITCH is
turned on, otherwise, the UE first transits to the CELL_PCH
state. After that, the UE transits to the URA_PCH state if CELL
UPDATE messages are frequently reported.
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page29
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page30
CELL_PCH to URA_PCH
Before the state transition, the state of the UE is CELL_PCH. During
the cell reselection, the UE sends the CELL UPDATE messages. The
RNC starts a timer (CellReSelectTimer) and counts the number of
CELL UPDATE messages with the cause value of cell reselection. When
the timer expires, the number of CELL UPDATE messages may be
above the threshold (CellReSelectCounter). In this case, the RNC
initiates a state transition when the UE sends the CELL UPDATE
message again
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page31
P2U Transition Parameters
Parameter Parameter name Recommended
value
CellReSelectTimer Cell Reselection Timer 180s
CellReSelectCounter Cell Reselection Counter
Threshold 9
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page32
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page33
CELL_PCH/URA_PCH to CELL_FACH
The state of the UE transits from CELL_PCH/URA_PCH to
CELL_FACH when the UTRAN pages the UE or when the UE
needs to exchange information with the UTRAN
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page34
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page35
U2U State Transition
U2U state transitions include U2F and F2U. The switch
parameter is RNC_U2U_SWITCH.
After returning to the service area, the UE that stays in the
URA_PCH state originates a cell update procedure. If the cell
update cause carried in the CELL UPDATE message is Re-
entered Service Area, the RNC sends a CELL UPDATE
CONFIRM message to instruct the UE to return to the URA_PCH
state.
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page36
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page37
CELL_FACH to CELL_DCH
The state of the UE transits from CELL_FACH to CELL_DCH
when the UTRAN receives a report that the UL/DL traffic
volume is above the threshold of event 4a
The following table lists the target rates for UE state transitions
from CELL_FACH to CELL_DCH
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page38
F2D Transition Parameters
Service Type Parameter Parameter name
Recommended
value
BE service on the
DCH
BeF2DTvmThd BE F/R2D 4A Threshold 256bytes
BeF2DTvmTimeToTrig BE F/R2D 4A Time 0s
BE service on the
HS-DSCH
BeF2HTvmThd BE F2HS-DSCH 4A Threshold 256bytes
BeF2HTvmTimeToTrig BE F2HS-DSCH 4A Time 0s
PS real-time
service
RtF2DHTvmThd RT F2D/HSPA 4A Threshold 1024bytes
RtF2DHTvmTimeToTrig RT F2D/HSPA 4A Time 0s
BE service on the
E-DCH
BeF2ETvmThd BE F2E-DCH 4A Threshold 1024bytes
BeF2ETvmTimeToTrig BE F2E-DCH 4A Time 0s
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page39
Contents
2. Basic UE State Transition Description
2.1 D2F State Transition
2.2 F2P State Transition
2.3 F2U State Transition
2.4 P2U State Transition
2.5 P2F and U2F State Transition
2.6 U2U State Transition
2.7 F2D State Transition
2.8 D2D State Transition
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
CELL_DCH (D2D)
For HSDPA and HSUPA, there are two more sub-state called
CELL_DCH (with HS-DSCH) and CELL_DCH (with E-DCH).
Page40
CELL_DCH
(with E-DCH)
CELL_DCH
(with DCH)
CELL_DCH
(with HS-DSCH)
Traffic Volume(4A) Traffic Volume(4A)
Periodical Retrying
Moving to a R99 cell
Insufficient coverage
Periodical Retrying
Moving to a R99 cell
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
Sub-State Transition Type Type Trigger
E2D
•During RAB setup, RAB should be carried over E-DCH but resources are insufficient
•During RAB setup, RAB should be carried over E-DCH but the coverage is insufficient.
•After HSUPA RAB setup, if the radio coverage is poor during HSUPA data transmission, refer to the
descriptions under this table.
•E-DCH serving cell change (change of best cell)
− New best cell does not support E-DCH
− New best cell does not have enough resources for E-DCH
D2E
•In any of the scenarios above (E2D), it is possible to transit DCH to E-DCH
− Periodic attempt to reconfigure to E-DCH (timer)
− Traffic volume (event 4A)
•If a UE reports event 6B2 and event 4A, and the UE services can be carried on the E-DCH, then the RNC
switches the UE from the DCH to the E-DCH during the rate increase process.
H2D
•RAB should be carried over HS-DSCH but resources are insufficient
•HS-DSCH serving cell change (change of best cell)
− New best cell does not support HS-DSCH
− New best cell does not have enough resources for HS-DSCH
D2H
•In any of the scenarios above (H2D), it is possible to transit DCH to HS-DSCH later.
− Periodic attempt to reconfigure to HS-DSCH (timer)
− Traffic volume (event 4A)
Page41
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
E2D/D2E in Access State Introduction
Dynamic UL channel
According to the coverage (CPICH EcN0) in RRC CONNECT REQ
reported by UE, RNC decides which kind of uplink channel to
establish
Purpose
If the coverage is poor, EcN0 reported by UE is low. In this case,
DCH channel should be configured to guarantee the coverage
If the coverage is good, EcN0 is high. In that case, E-DCH channel
should be configured to guarantee the throughput
Page42
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
E2D/D2E in Connection State
Introduction Measurements
RNC monitors the uplink throughput
UE measures and reports the state of TX power by 6A and 6B
event
E2D Conditions
Throughput in UL is below the 4B threshold for E2D
Event 6A report has been received
E2D is triggered if both above conditions are met
Page43
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
E2D/D2E in Connection State
Introduction D2E Conditions
Rate rise is triggered by DCCC mechanism
Event 6B report has been received
D2E is triggered if both above conditions are met
Page44
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
D2D Transition Parameters
Page45
ReservedSwitch0- RESERVED_SWITCH_0_BIT7
Parameter name: Switch of E-DCH to DCH
Recommended value: RESERVED_SWITCH_0_BIT7 -OFF
ReservedSwitch0
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
D2D Transition Parameters
Page46
Parameter Description
Recommended
value
Application
Scenarios
BeThd6A1
Event
6A1/6B1/6A2/6B2
Threshold for E-DCH
to DCH
3dB 2ms TTI HSUPA
BeThd6B1 3dB 2ms TTI HSUPA
BeThd6A2 4dB 10ms TTI HSUPA
BeThd6B2 4dB 10ms TTI HSUPA
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page47
Contents
1. UE State Transition Overview
2. Basic UE State Transition Description
3. UE State Transition Application
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page48
Contents
3. UE State Transition Application
3.1 CPC and EFACH State Transition
3.2 Always Online
3.3 Fast State Transition
3.4 Smart P2D
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
CPC and EFACH State Transition
HSPA+ requires two new states: CELL_DCH (CPC) state and enhanced
CELL_FACH state. The CELL_DCH (CPC) state corresponds to the CELL_DCH
state with CPC activated, and the enhanced CELL_FACH state corresponds to
the CELL_FACH state with Enhanced CELL_FACH operation activated
Page49
CELL_DCH CELL_DCH(CPC)
Enhanced
CELL_FACH CELL_FACH
CELL_PCH
4A 4B 4A 4B 4A
4B
4B Data
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page50
New Timers to Trigger Event 4B
Type New Timer Description
CPC2F
•BeCpc2FStateTransTimer: BE service state transition timer (CPC_HS-DSCH to F/RACH)
•RtCpc2FStateTransTimer: real-time service state transition timer (CPC_HSPA to F/RACH)
D2EFACH
•BeD2EFachStateTransTimer: BE service state transition timer (DCH to E_FACH)
•BeH2EFachStateTransTimer: BE service state transition timer (HS-DSCH to E_FACH)
•RtDH2EFachStateTransTimer: real-time service state transition timer (DCH or HSPA to E_FACH)
CPC2EFACH
•BeCpc2EFachStateTransTimer: BE service state transition timer (CPC_HS-DSCH to E_FACH)
•RtCpc2EFachStateTransTimer: real-time service state transition timer (CPC_HSPA to E_FACH)
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page51
New Timers and Thresholds to Trigger
Event 4A
Type New Timer and Thresholds Description
F2CPC
The new thresholds are as follows: •BeF2CpcHTvmThd: event 4A threshold for BE service state transition (F/RACH to CPC_HS-DSCH)
•RtF2CpcTvmThd: event 4A threshold for real-time service state transition (F/RACH to CPC_HSPA)
•BeF2CpcETvmThd: event 4A threshold for BE service state transition (F/RACH to CPC_E-DCH)
The new timers are as follows: •BeF2CpcHTvmTimeToTrig: event 4A trigger time for BE service state transition (F/RACH to
CPC_HS-DSCH)
•RtF2CpcTvmTimeToTrig: event 4A trigger time for real-time service state transition (F/RACH to
CPC_HSPA)
•BeF2CpcETvmTimeToTrig: event 4A trigger time for real-time service state transition (F/RACH to
CPC_E-DCH)
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page52
New Timers and Thresholds to Trigger
Event 4A(Cont.)
Type New Timer and Thresholds Description
EFACH2D
The new thresholds are as follows: •BeEFach2DTvmThd: event 4A threshold for BE service state transition (E_FACH to DCH)
•BeEFach2HTvmThd: event 4A threshold for BE service state transition (E_FACH to HS-DSCH)
•RtEFach2DHTvmThd: event 4A threshold for real-time service state transition (E_FACH to
DCH or HSPA)
The new timers are as follows: •BeEFach2DTvmTimeToTrig: event 4A trigger time for BE service state transition (E-FACH to
DCH)
•BeEFach2HTvmTimeToTrig: event 4A trigger time for BE service state transition (E_FACH to
HS-DSCH)
•RtEFach2DHTvmTimeToTrig: event 4A trigger time for real-time service state transition
(E_FACH to DCH/HSPA)
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page53
New Timers and Thresholds to Trigger
Event 4A(Cont.)
Type New Timer and Thresholds Description
EFACH2CPC
The new thresholds are as follows: •BeEFach2CpcTvmThd: event 4A threshold for BE service state transition (E_FACH to
CPC_HS-DSCH)
• RtEFach2CpcTvmThd: event 4A threshold for PS real-time service state transition (E_FACH
to CPC_HSPA)
The new timers are as follows: •BeEFach2CpcTvmTimeToTrig: event 4A trigger time for BE service state transition
(E_FACH to CPC_HS-DSCH)
•RtEFach2CpcTvmTimeToTrig: event 4A trigger time for real-time service state transition
(E_FACH to CPC_HSPA)
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page54
Contents
3. UE State Transition Application
3.1 CPC and EFACH State Transition
3.2 Always Online
3.3 Fast State Transition
3.4 Smart P2D
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page55
Always Online
When the RNC detects that there is no data transmission for a
PS service, the RNC sends a request to the CN for release of the
service. The CN initiates the release procedure, requesting the
RNC to release the corresponding radio resources
The CN, however, reserves the PDP context for this PS service
of the UE. When the UE re-initiates the service of this PDP
context, it need not apply for the PDP context again. Thus, the
UE in the PS domain is always online
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Always Online Procedure
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Parameters of Always Online
Timer Service Type Parameter Recommended value
T1
Conversational PsInactTmrForCon 20s
Streaming PsInactTmrForStr 20s
Interactive PsInactTmrForInt 20s
Background PsInactTmrForBac 20s
T2
Conversational ProtectTmrForCon 20s
Streaming ProtectTmrForStr 20s
Interactive ProtectTmrForInt 20s
Background ProtectTmrForBac 20s
Recommended values of T1 and T2:
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page58
Contents
3. UE State Transition Application
3.1 CPC and EFACH State Transition
3.2 Always Online
3.3 Fast State Transition
3.4 Smart P2D
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
Fast State Transition
Generally, when a smartphone is performing services, data transmission lasts
for 1 to 2 seconds, and the transmission interval is longer than the interval
specified by the timer for state transition from CELL_DCH to CELL_FACH,
CELL_PCH, or URA_PCH. This causes the smartphone to stay in the CELL_DCH
state for a long time even when no data is transmitted, wasting network
resources.
Page59
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page60
Fast State Transition Parameters
Parameter Parameter name Recommended
value
PsInactTmrForFstDrmDch FAST DORMANCY USER T1
in CELL_DCH 4s
PsInactTmrForFstDrmFach FAST DORMANCY USER T1
in CELL_FACH 10s
PsInactTmrForPreFstDrm FAST DORMANCY USER T1
in CELL_PCH 360s
TthdForSFSTUserIdentify
Timer for determining
whether a UE is capable of
fast state transition
15s
With these timers, the smartphone can quickly change from the CELL_DCH to
CELL_FACH, CELL_PACH, or URA_PCH state in a shorter period upon
completing data transmission.
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page61
Contents
3. UE State Transition Application
3.1 CPC and EFACH State Transition
3.2 Always Online
3.3 Fast State Transition
3.4 Smart P2D
Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
Smart P2D Transition
If severe FACH congestion occurs on a live network, the smart
CELL_PCH/URA_PCH-to-CELL_DCH (P2D) function can be used to directly
transit the state of a UE with high traffic volume from CELL_PCH or URA_PCH
to CELL_DCH. The UE does not transmit data in the CELL_FACH state. This
saves bandwidth resources on the CELL_FACH, eases FACH congestion, and
reduces the delay for processing high traffic.
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Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
Smart P2D Transition(Cont.)
The RNC records the amount of data transmitted by a UE four
consecutive times and predicts the amount of data the UE will
transmit subsequently.
If the amount of data transmitted by a UE four consecutive times exceeds
the value of TvmThdForSmartP2D, the RNC predicts that the amount of
data the UE will transmit subsequently will remain above the value
of TvmThdForSmartP2D.
If the amount of data transmitted by a UE four consecutive times is less
than or equal to the value of TvmThdForSmartP2D, the RNC predicts
that the UE has a small amount of data to transmit subsequently.
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Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved.
Smart P2D Transition Parameters
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TvmThdForSmartP2D
Parameter name: Threshold for Smart P2D
Recommended value: 510byte
TvmThdForSmartP2D
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