smartphones and network signalling load 20110927
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1 © Nokia Siemens Networks / Smartphones and Network Signalling Load / Atinan Tumsatan
Smartphone and network signaling load Bandung September 22nd – 23rd , 2011
2 © Nokia Siemens Networks / Smartphones and Network Signalling Load / Atinan Tumsatan
Packet Data Transfer States
3 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
UTRA RRC state transitions
Inactivity timer
Inactivity timer
Inactivity timer
PCH/URA
DCH/HSDPCH
Cell_FACH
>200 mA
>100 mA
< 5 mA
< 5 mA
30 signaling
messages
(2 s)
12 signaling
messages
(<0.5 s) 3 msgs 2 msgs
6 msgs 6 msgs
4 msgs
Idle
T1
T2
T3
4 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
States within UTRA RRC connected mode
5 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
States within UTRA RRC connected mode
6 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
States transition Cell_DCH
Transition from Cell_DCH state to Cell_FACH state
• inactivity during service establishment phase
• SRBs and PS RT/NRT RBs inactivity after a packet call
• SRB inactivity and NRT RBs release level throughput
• SRBs inactivity and MAC-d flow low utilization or low throughput
• last CS RAB released (Iu-PS connection exists)
• loss of FP-level synchronization (transport bearer synchronization failure)
• delay of FP-level frames when UE is in SHO
• loss of L1 synchronization (radio link failure detected by the UE)
• L2 signaling error (RLC unrecoverable error) detected in the Cell_DCH state
Transition from Cell_DCH state to PCH states
• Long inactivity of NRT RB(s) detected
• Release of RT RB and inactive NRT RB(s) and/or signaling connection
• HW resources at low level
• Rel8 Fast Dormancy
7 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Packet Data Transfer States RNC parameters and timers: CELL_DCH state
Timers for supervising RB and SRB
activity during service establishment
UL_DLcapacityReqWait = 5 sec
SignallingLinkInactivityTimer = 2 sec
* Only uplink parameters are listed here, corresponding timers are also defined for downlink direction.
InactivityTimerUplinkDCH384* = 2 sec
InactivityTimerUplinkDCH320* = 2 sec
InactivityTinerUplinkDCH256* = 2 sec
InactivityTinerUplinkDCH128* = 2 sec
InactivityTinerUplinkDCH64* = 3 sec
InactivityTinerUplinkDCH32* = 5 sec
InactivityTinerUplinkDCH16* = 5 sec
InactivityTinerUplinkDCH8* = 5 sec
CellDCHtestTmr = 0 minute
ToCellFACHinTest = 1(Yes)
InactDetForStreamingRB = 1(In use)
Release threshold parameters for the
NRT DCH utilisation measurement
DCHutilRelThrUL = 256 bps
DCHutilRelThrDL = 256 bps
MACdflowutilRelThr = 256 bps
MACdflowutilTimetoTrigger = 0 sec
MACdflowthroughputRelThr = 0 bps
MACdflowthroughputTimeToTrigger = 5 sec
MACdflowthroughputAveWin = 3 sec
EDCHMACdFlowThroughputAveWin = 3 sec
EDCHMACdFlowThroughputRelThr = 256 bps
EDCHMACdFlowThroughputTimeToTrigger = 5 sec
HSDSCHGuardTimerLowThroughput = 30 sec
Timers and parameters for supervising SRBs and PS RT/NRT RBs inactivity in Cell_DCH
state
8 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Cell_FACH state to Cell/URA_PCH state
UL/DLActivationTimer = 2000 ms
ExtendedULDLActivationTmr = 0 sec
SignConnActivitySupervision = 1 minute
CVUserInactInSignConnRel = 1(Yes)
Packet Data Transfer States RNC parameters and timers: CELL_FACH state
Cell_FACH state to Cell_DCH state
TrafVolThresholdULLow = 128 bytes
TrafVolTimeToTriggerUL = 0 ms
[WCEL] TrafVolThresholdDLLow = 128 bytes
TrafVolTimeToTriggerDL = 0 ms
9 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Packet Data Transfer States RNC parameters and timers: CELL/URA_PCH states
Paging (Cell/URA_PCH to Cell_FACH)
PageRep1stInterv = 700ms
PageRep2ndInterv = 2000ms
UE timers and constants (on which the
corresponding RNC timers are based)
for “Out of Service Area” detection in
Cell_FACH and Cell/URA PCH states
T316 = 30 seconds
T317 = 180 seconds
T305 = 30 minutes
T307 = 30 seconds
T302 = 2000 ms
N302 = 7
Cell/URA_PCH to Cell_DCH
CUCforPCHtoDCHallowed = 1(true)
[WCEL] CUCEcNoThreshold = 31 (~ -9dB)
[WCEL] CUCRSCPThreshold = -92 dBM
[WCEL] RACHIntraFreqMesQuant = 0 (EcNo)
[System-defined]TrafVolThrDLLowGTP = 128 bytes
Cell_FACH or Cell_PCH to URA_PCH
MaxCellReselections = 3 times
CellReselectionObservingTime = 16 minutes
Timer for user inactivity detection in
Cell_PCH state
MSActivitySupervision = 29 minutes
10 © Nokia Siemens Networks / Smartphones and Network Signalling Load / Atinan Tumsatan
RAN2136 Fast Dormancy
11 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
RAN2136 Fast Dormancy
Brief description:
• Fast dormancy is an 3GPP Rel.8 feature optional for UEs.
• The purpose of this feature is to reduce the signaling load between the 3G network and the UE and to save the UE’s battery life.
• The UE informs the network when a PS data transmission ends. The network changes the UE state directly to Cell_PCH or URA_PCH state, which lowers the UE battery consumption considerably, instead of staying in Cell_DCH or Cell_FACH state.
• If the UE needs to send or receive data the required signaling from Cell/URA_PCH state is only a fraction of the signaling needed in starting from IDLE mode.\
Benefits:
• [User] : UE works longer without battery recharge because of lower battery consumption.
• [Operator] : saves significantly on the signaling load compared to going to IDLE mode.
PCH states have to be supported in the RNC before the Fast Dormancy
feature can be activated ([RNC]MSActivitySupervision value has to be >0).
12 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
The UE sends SIGNALLING CONNECTION RELEASE INDICATION message with
"Signalling Connection Release Indication Cause“ with the cause value UE Request PS Data
session end to the RNC. The RNC receives the message and starts immediately the UE
state change from Cell_DCH to Cell_PCH or URA_PCH state.
SCRI with the cause value
“UE Request PS Data session end”
UE sends SCRI
SCRI = Signalling Connection Release Indication
UE sends SCRI
RAN2136 Fast Dormancy Functional Description (1/2)
Inactivity timer
Inactivity timer
Inactivity timer
PCH
Idle
DCH/HSDPCH
Cell_FACH
>200 mA
>100 mA
< 5 mA
< 5 mA
Idle
Inactivity timer
Inactivity timer
Inactivity timer
PCH
Idle
DCH/HSDPCH
Cell_FACH
>200 mA
>100 mA
< 5 mA
< 5 mA
Idle
3GPP R8 or later UEs
3GPP R7 or earlier UEs
RAN2136 Fast Dormancy is activated
13 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
RAN2136 Fast Dormancy Functional Description (2/2)
• There is a new UE Signalling Connection Release Indication Cause value in SIGNALLING CONNECTION RELEASE INDICATION message. This new cause is UE Request PS Data session end and it indicates to the network that the UE has concluded active PS data transfer.
• When the RNC receives the cause value, it starts immediately the UE state change from Cell_DCH state to Cell_PCH or URA_PCH state by sending RADIO BEARER RECONFIGURATION message to the UE.
14 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
RAN2136 Fast Dormancy Signalling messages needed vs. RRC states
RRC NBAP RANAP ALCAP
From Idle_mode to Cell_DCH 12 5 7 6
From Cell_PCH to Cell_DCH 5 3 0 4
Number of messages
15 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Software Requirements
Network Hardware Requirements
• This feature does not require any new or additional HW.
Interdependencies between Features
• PCH states have to be supported in the RNC before the Fast
Dormancy feature can be activated.
RAN2136 Fast Dormancy Requirements
16 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
• There’s no parameter to enabled/disable Fast Dormancy in
RU20. It’s possible in RU30.
• Cell_PCH state is prerequisite for Fast Dormancy to be activated ([RNC] MSActivitySupervision > 0).
Parameter settings
RAN2136 Fast Dormancy Parameters
17 © Nokia Siemens Networks / Smartphones and Network Signalling Load / Atinan Tumsatan
Blackberry
18 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Cell_DCH
Cell_PCH
Cell_PCH & NCFD are Activated
BB Torch 2
RAN2136 Fast Dormancy Test results from Live network
UE setting: use Default (Rel8) Fast Dormancy
19 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Cell_DCH
Idle
RAN2136 Fast Dormancy Test results from Live network
BB Torch 2
Cell_PCH & NCFD are Activated
UE setting: Use Rel99 Fast Dormancy
20 © Nokia Siemens Networks / Smartphones and Network Signalling Load / Atinan Tumsatan
iPhone 4 iOS 4.3
21 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Cell_FACH
Cell_PCH
Cell_PCH & NCFD are Activated
Log file
iPhone 4 iOS 4.3.5
RAN2136 Fast Dormancy Test results in Test Bed
22 © Nokia Siemens Networks / Smartphones and Network Signalling Load/ Atinan Tumsatan
Cell_FACH
Idle
Cell_PCH & NCFD are Deactivated
Log file RAN2136 Fast Dormancy Test results in Test Bed
iPhone 4 iOS 4.3.3
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