hspa layering for ues in common channels
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© 2007 Nokia DRAFT Issue 1-1 dn0666854
Nokia Proprietary and Confidential
Nokia WCDMA RAN System, Rel. RAS06, Pre-Release
Documentation
HSPA Layering for UEs in Common
Channels
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© 2007 Nokia DRAFT Issue 1-1 dn0666854
Nokia Proprietary and Confidential
Short feature description
• This feature transfers UEs to correct layer based on their HSDPA and HSUPA
capability.
• Non-HSDPA UEs are transferred to the non-HSDPA layer.
• HSDPA capable UEs are transferred to the layer that supports HSDPA.
• HSUPA capable UEs are transferred to layer that supports HSUPA.
• If there are several HSDPA, HSUPA or non-HSDPA layers, load balancing is utilized.
• The transfer occurs in
• RRC connection setup phase (Directed RRC connection setup for HSDPA layer)
• State transition from Cell_FACH to Cell_DCH.
• This feature also covers enhancements to the Directed RRC Connection Setup
for HSDPA Layer feature.
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Operator benefits
• The feature greatly enhances two (or several) layer operation with HSDPA and
HSUPA. Choosing the correct layer for the UE on each transition to Cell_DCH
guarantees correct layer based on the UE capability on all practical mobility
scenarios.• When several layers support HSPA, the feature chooses the layer in an optimal
manner based on expected DL throughput on each HSPA layer.
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Main functionality
Contents:
1. Introduction
2. Signalling
3. Decision making is based on
• UE capability in decision making
• The service which UE is going to use in decision making
4. Decision making in RRC connection setup phase
• Directed RRC connection setup in non-HSPA layer
• Directed RRC connection setup in HSDPA/HSPA layer
5. Decision making in state transition Cell_FACH -> Cell_DCH phase
• State transition Cell_FACH -> Cell_DCH in non-HSPA layer
• State transition Cell_FACH -> Cell_DCH in HSDPA/HSPA layer
6. HSDPA load balancing
7. Interworking with Directed RRC connection setup feature
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Introduction
• Feature consist of
• Enhancement of Directed RRC connection setup for HSDPA layer
• The service indicated by UE in RRC connection request is taken into account
• More than 2 layers are supported
• Target cell load checking and HSDPA load balancing
• Simultaneous use of Directed RRC Connection Setup and Directed RRC Connection
Setup for HSDPA layer is supported
• UE capability indication IE (coming in RRC Connection Request message) is used indecision making for Rel-6 and onwards UEs.
• Moving UE to correct layer in state transition Cell_FACH -> Cell_DCH phase
• Feature works inside BTS between cell which has same Sector ID. (Also
Transmission power of primary CPICH (PtxPrimaryCPICH) and Offset of the P-
CPICH, reference service powers (CPICHtoRefRABoffset) and PLMN code
(MCC + MNC) needs to be identical.)
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Signalling
Directed RRC connection set up for HSDPA
layer (successful case signalling not
changed from RAN05)
HSPA layering for UEs in common channels
RNC
RLC parameters needto be changed
Frequency layer / cell selectionand capacity allocation
DL capacity need is detected by MAC orRAB Assignment Request from CS core
BTSUE
UE moves to CELL_DCH stateand to new frequency
RRC:Radio Bearer Reconfiguration (Frequency Info)
RRC: Radio Bearer Reconfiguration Complete
RRC:Measurement Report
(AND/OR)UL capacity need isdetected by MAC
UE is in CELL_DCH state
NBAP Radio Link Setup procedure
UE is in CELL_FACH or CELL_PCH state
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Decision making is based on
• UE capability
• Cell capabilities (non-HSDPA, HSDPA or HSPA)
• The service which UE is going to use
• Load balancing is utilized.
Source and target cell load is taken into account
• Measured Non-HSPA load in a cell• Measured HSDPA load in a cell
• Number of HSDPA and HSUPA users in a cell
• CellWeightForHSDPALayering (operator parameter)
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UE capability in decision making
Directed RRC connection set up for HSDPA
layer
• UE capability is interpret from the
information UE sends in RRC ConnectionRequest
• access stratum release indicator IE
(indicates the release that UE
supports) (Used already in RAS05)
• UE capability indication IE (indicates
the HSDPA and HSUPA capability of
Release 6 and onwards UEs)
HSPA layering for UEs in common channels
• When UE is either in Cell_FACH or
Cell_PCH state RNC has alreadyinformation of UE HSDPA and HSUPA
capability.
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The service which UE is going to use in decision
makingDirected RRC connection set up for HSDPA
layer
• Establishment cause IE in RRC
connection Request (indicates what kindof service UE is expected to be use).
• DRRCForHSDPALayerServices is
operator parameter. Operator can define
which services (indicated in Establishment
cause IE) it wants to direct to HSPA layer.
HSPA layering for UEs in common channels
• If PS service is started DL/UL capacity
need is detected by MAC layer orMeasurement Report from UE is
received.
• If CS service is started RAB Assignment
Request is received from CS core.
• ServicesToHSDPALayer is operator
parameter. Operator can define if only PS
RABs or all RABs are directed to HSDPA
layer.
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Decision making in RRC connection setup phase
• A cell which HSPA capability is identical with UE HSPA capability is selected ifpossible.
• R99 and Rel-4 UE -> non HSDPA cell
• Rel5 UE -> HSDPA cell• Rel-6 and newer non-HSDPA UE -> non HSDPA cell
• Rel-6 and newer HSDPA UE -> HSDPA cell
• Rel-6 and newer HSDPA&HSUPA UE -> HSDPA&HSUPA cell
• Establishment cause sent by UE needs to be activated inDRRCForHSDPALayerServices in the case the target cell supports HSDPA.
• Target cell load should not be too high
• HSDPA target cell – Maximum number of HSDPA users not reached.
• Non-HSDPA target cell – Directed RRC connection setup triggers not reached.• If several identical HSDPA candidate cells exist a cell with best available
HSDPA power per user is selected. (HSDPA load balancing)
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Directed RRC connection setup in non-HSPA layer
Decision making
1. UE HSPA capability = cell HSPAcapability (f1)
A Yes -> current layer (f1)
B&C No -> f2 & f3
2. Establishment cause =DRRCForHSDPALayerServices
B&C No -> current layer (f1)
B&C Yes -> f2 & f33. UE HSPA capability = target cell
HSPA capability (f2 & f3)
B -> f2 & f3
C -> f3
4. Better available HSDPAthroughput
B -> f2 or f3
f1, Rf1, R´́9999
f2, HSDPAf2, HSDPA
f3, HSDPA&HSUPAf3, HSDPA&HSUPA
A
B
UE reporting Rel5 or
Rel-6 & HSDPA capability
Any other UE
UE reporting Rel-6
HSDPA & HSUPA capability
C
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Directed RRC connection setup in HSDPA/HSPA layer
Decision making
1. UE HSDPA capability = cell HSDPA
capability (f2/f3)
A No -> f1
B&C No -> f2 & f3
2. Establishment cause =
DRRCForHSDPALayerServices
B&C No -> current layer (f2/f3)
B&C Yes -> f2 & f3
3. UE HSUPA capability = cell HSUPA
capability (f2 & f3)
B -> f2 & f3
C -> f3
4. Better available HSDPA throughput (forinteractive and background
Establishment cause)
B -> f2 or f3
f1, Rf1, R´́9999
f2, HSDPAf2, HSDPA
f3, HSDPA&HSUPAf3, HSDPA&HSUPA
A
B
UE reporting Rel5 or
Rel-6 & HSDPA capability
Any other UE
UE reporting Rel-6
HSDPA & HSUPA capability
C
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Decision making in state transition Cell_FACH ->
Cell_DCH phase• A cell which HSPA capability is identical with UE HSPA capability is selected if
possible.
• non-HSDPA UE -> non HSDPA cell
• HSDPA UE -> HSDPA cell
• HSDPA&HSUPA UE -> HSDPA&HSUPA cell
• RAB type needs to be activated in ServicesToHSDPALayer (PS, any type of
service) in the case the target cell supports HSDPA.
• Target cell load should not be too high
• HSDPA target cell – Maximum number of HSDPA users not reached.
• Non-HSDPA target cell – Directed RRC connection setup triggers not reached.
• If several identical HSDPA candidate cells exist a cell with best availableHSDPA power per user is selected. (HSDPA load balancing)
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State transit ion Cell_FACH -> Cell_DCH in non-HSPA
layer Decision making
1. UE HSPA capability = cell HSPA
capability (f1)
A Yes -> current layer (f1)B&C No -> f2 & f3
2. RAB type =
ServicesToHSDPALayer
B&C No -> current layer (f1)
B&C Yes -> f2 & f3
3. UE HSPA capability = target cell
HSPA capability (f2 & f3)
B -> f2 & f3
C -> f3
4. Better available HSDPA
throughput
B -> f2 or f3
f1, Rf1, R´́9999
f2, HSDPAf2, HSDPA
f3, HSDPA&HSUPAf3, HSDPA&HSUPA
A
B
UE reporting Rel5 or
Rel-6 & HSDPA capability
Any other UE
UE reporting Rel-6
HSDPA & HSUPA
capability
C
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State transit ion Cell_FACH -> Cell_DCH in
HSDPA/HSPA layer Decision making
1. UE HSDPA capability = cellHSDPA capability (f2/f3)
A No -> f1
B&C No -> f2 & f3
2. RAB type = interactive orbackground
B&C No -> current layer (f2/f3)
B&C Yes -> f2 & f33. UE HSUPA capability = cell
HSUPA capability (f2 & f3)
B -> f2 & f3
C -> f3
4. Better available HSDPAthroughput
B -> f2 or f3
f1, Rf1, R´́9999
f2, HSDPAf2, HSDPA
f3, HSDPA&HSUPAf3, HSDPA&HSUPA
A
B
UE reporting Rel5 or
Rel-6 & HSDPA capability
Any other UE
UE reporting Rel-6
HSDPA & HSUPA capability
C
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HSDPA load balancing (under threshold) 1/3
Cell which has1. highest cell weight
(CellWeightForHSDPALayering)
2. number of HS-DSCH
users is highest
shall be selected.
Cell
f1
Number of HS-DSCH users in the cell in the decision making moment
Max
0
HSDPALayerLoadShareThreshold
Cell
f2
Cell
f3
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HSDPA load balancing (over threshold) 2/3
Cell which has
1. highest cell weight
(CellWeightForHSDPALayering)
2. number of HS-DSCH
users is highestshall be selected.
Cell
f1
Number of HS-DSCH users in the cell in the decision making moment
Max
0
HSDPALayerLoadShareThreshold
Cell
f2
Cell
f3
Cell which has highest
HSDPA power per
user available shall beselected
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HSDPA load balancing (HSDPA power per user) 3/3
( )1
*
+
−=
DPAusers NumberOfHS
yeringForHSDPALaCellWeight PtxNonHSPAPPerUser HSDPApower Max
Operator parameter
(Range 0.01 … 1)
Number of HSDPA users
active in the cell
A cell with highest available HSDPA power per user shall be selected.
HSPA
power
Non
HSPA
power
Cell
PtxNonHSPA
Pmax
0
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Interworking with Directed RRC connection setup
feature(Both parameters DirectedRRCEnabled and DirectedRRCForHSDPAEnabled are enabled.)
• The decision of directed RRC connection setup for HSDPA layer is done.
Decision = Change layer: Directed RRC connection setup for HSDPA layer is done.
Decision = Do not change layer: The decision of directed RRC connection setup is done.
• If several candidates exist (more than 2 layers) for Directed RRC connection setup UE is
tried to keep in most suitable layer from capability point of view.
• Non-HSDPA capable UE -> non-HSDPA capable cell
• HSDPA capable UE -> HSDPA or HSDPA&HSUPA capable cell
• HSDPA&HSUPA capable UE -> HSDPA&HSUPA capable cell is preferred and HSDPA
capable is next preferred.
• HSDPA/HSPA capable UEs in Directed RRC connection setup
• are not transferred away from HSDPA/HSPA layer if they are requesting interactive or
background service.• can be transferred away from HSDPA/HSPA layer if they are requesting other than interactive
or background service.
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How feature will be implemented to RAN
• The affected NEs are RNC and NetAct.
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Interaction with other features
• Directed RRC connection setup (explained in couple of slides before)
• Service and load based handover:
• Service and load based handovers are not done to HSDPA capable UEs in HSDPA
capable cell.
• Service and load based handover can transfer non HSDPA capable UE or HSDPA
capable UE which is in non-HSDPA capable cell to different layer than this feature or
directed RRC connection setup have directed the UE.
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Feature specific parameters 1/3
Enables / disables the use of Directed
RRC connection setup for HSDPA
layer in the cell. (Old RAN05 feature)
00 Disabled1 EnabledOnlineDirectedRRCForHSDPALayerEnabledWCEL
Enables / disables the improvements
for RAN05 feature Directed RRC
connection setup for HSDPA layer .
00 Disabled
1 Enabled
OnlineDirectedRRCForHSDPALayerEnhancRNC
Enables / disables the use of HSDPA
layering for UEs in common channelsfeatures in the cell.
00 Disabled
1 Enabled
OnlineHSDPALayeringCommonChEnabledWCEL
Enables / disables the use of Directed
RRC connection setup in the cell. (Old
RAN04 feature)
10 Disabled
1 Enabled
OnlineDirectedRRCEnabledWCEL
DescriptionDefault
Value
RangeModificationNameObject
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Feature specific parameters 2/3
Directed RRC connection
setup for HSDPA layer (from
non-HSDPA layer to HSDPA
layer) in the cell is done ifthe UE indicates the service
in RRC Connection Request
(Establishment cause) which
is activated by this
parameter.
interactive
and
background
calls, Inter-RAT cell re-
selections
and Inter-
RAT cell
change order
Bitmask (16
bits)
OnlineDRRCForHSDPALayerServicesRNC
In state transition fromCell_FACH to Cell_DCH the
UE is transferred to HSDPA
layer if it has requested the
service defined with this
parameter.
00: Any typeof service is
requested
1: NRT PS
RAB is
requested
OnlineServicesToHSDPALayer RNC
DescriptionDefault
Value
RangeModificationNameObject
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Feature specific parameters 3/3
This parameter is used to give
weight for the cell in HSDPA
layering decision making.
10.01 – 1,
step 0.01
OnlineCellWeightForHSDPALayeringWCEL
This parameter is used to
define if available HSDPApower is taken into account in
decision making for HSDPA
layering.
00 NO
1 YES
OnlineDisablePowerInHSDPALayeringDecisionRNC
This parameter is used todefine the threshold (number
of HSDPA users) for load
sharing between HSDPA
layers.
10Disabled
1 Enabled
OnlineHSDPALayerLoadShareThresholdRNC
DescriptionDefault
Value
RangeModificationNameObject
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