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8/13/2019 Ranpar Rrm Overview
1/25
1 Nokia Siemens Networks Presentation / AA / 01_2010
I insert classification level
Course Content
Radio Resource Management Overview
Parameter Configuration
Common Channels & Power Control
Load Control
Admission Control
Packet Scheduling
Handover Control
Resource ManagerHSDPA RRM & parameters
HSUPA RRM & parameters
HSPA+ RRM (Rel. 7/8)
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Module Objectives
At the end of the module you will be able to:
Describe the purpose of RRM
List the RRM functional entities
Describe the purpose of each of the RRM functional entities
Identify the location of RRM entities
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSDPA
RRM of HSUPA
RRM of HSPA+ (Rel. 7/8)
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Radio Resource Management
Target for RRM is to ensure the RAN offers:
The planned coverage for each targeted service
High capacity i.e. low blocking (new calls, handovers)
The required Quality of Service (QoS)
Optimize the use of available capacity (priorities)
By continuously monitoring/adjusting how the available resources are used inaccordance with user requests
Radio Resource Management (RRM) is responsible for optimalutilisation of the air interface resources
RRM
Link Quality
Cell CoverageCell Capacity
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RRM Tasks
RRM must be able to:
Predict the impact on interference (power) of
the admitting a new user for UL & DL
Perform appropriate actions (e.g. new calladmissions, bitrate increase/decrease etc.) in
accordance with prevailing load conditions
Provide different quality of service for real
time (RT) and non-real time (NRT) users
Take appropriate corrective action when the
different cell load thresholds are exceeded in
order to maintain cell stability (i.e. loadcontrol)
Overload
Load Target
Overload Margin
Power
Time
Estimated capacityfor NRT traffic
Measured load causedby non-controllable load(RT)
RT services must have higher quality assurance than NRT
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RRM is made up of a number of closely interdependent functions (i.e.algorithms)
These functions can be divided into;
Cell Based Load control (LC)
Admission control (AC)
Packet scheduling (PS) High Speed Downlink Packet Access
Resource manager (RM)
Connection Based
Handover control (HC)
Power control (PC)
RRM Functional Split
PC
HC
Connection based functions
LC
AC
Cell based functions
PS
RM
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSPA
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Load control States
The load control function within RRM can be divided:
Preventative load control (e.g. congestion)
Overload control (e.g. dropping of calls in worst case)
Preventative actions are performed before the cell is overloaded (threshold y) Overload actions are performed after cell is overloaded (threshold x)
RNP parameters define the thresholds for the RRM functionalities
The thresholds define a stable functionality within a cell & with surrounding cells
Overloadthreshold x
Load Targetthreshold y
Power
Time
Estimated capacity forNRT traffic.
Measured load caused
by non-controllable load(RT)
Preventative Load Control
Overload Control
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Load Control
LC performs the function of load control in association with AC & PS
Updates load status using measurements & estimations provided by AC & PS
Continuously feeds cell load information to PS & AC:
Interference levels
BTS power levels
Non-controllable load
LC
AC
PSNRT load
Load change info
Load status
Load differentiation:
Total load =
Controllable load +
Semi-controllable load +
Non-controllable load
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSPA
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Admission Control
Responsible for maximising capacity (throughput) whilst providing the required quality of
service for RT traffic.
Checks that admitting a new user will not sacrifice planned coverage or quality of existing
connections
Determines whether RABs can be admitted to the RAN
Handles RT RABs alone by estimating the increase in non-controllable load
With PS decides whether to allocate resources to NRT RABs
In the decision UL interference & DL power measurements by BTS are used
Since RAS06 also the UL throughput is considered for AC
Provides RLC parameters to PS for NRT users, for example
Bearer class
Transport Formats
AC sets quality and power parameters for the radio link, for example
UL/DL BLER, Eb/No targets, SIR target
Initial DL transmission power
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Admission Control (RAS05.1 picture)
In UL the received total wideband interference power (RTWP) measured indicates thetraffic load of the radio resources.
For DL the power change caused by new RT service is obtained from the maximum
allowed DL transmission power for the service.
In the admission decision procedure new call (or modified existing call) is admitted if
both UL and DL admission decisions are passed
Prx_target
Prx_target_BS
UL interference power
Load
Planned load area
Marginal load area
PrxTotal
RNP decisionthresholds
RNP: Radio Network Planning
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Admission Control, UL
Noise Rise
Own Cell Load Factor(throughput)
i-factor
PrxOffset
Minimumthroughput
DCH
PrxLoadMarginDCH
Maximum
throughputDCH
PrxLoadMarginMaxDCH
PrxTarget
Throughput thresholds are calculated from new, configurable Prx thresholds (since RAS 06)
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSPA
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PS allocation times need to be fast to accommodate changing conditions &
accurate (up-to-date load info)
Capacity requests sent via traffic volume measurement reports (governed by
RNP parameters)
PS comprises two parts: UE specific & Cell specific
power
time
non-controllable load
controllable load
Total Load
Target threshold
Overload threshold
Responsible for scheduling radio
resources for both UL and DL R99 NRT
RABs
Scheduling period defined by RNP
parameters
PS relies on up-to-date information from
AC and LC
Capacity allocated on a needs basisusing best effort approach
Packet Scheduler in RNC
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSPA
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Power Control (PC)
Since WCDMA system is interference limited it is beneficial to reduce
transmission power as far as possible.
Thus, the target of PC is to achieve the min. SIR that is required to offer
sufficient quality of the connection. PC works on a per-connection basis.
Power Control
Power ControlLoad Control
RNCBSMS
Power ControlHandover Control
Admission ControlLoad Control
Packet Scheduler
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSPA
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Handover Control (HC)
HC is responsible for
Managing the mobility aspects of an RRC connection as UE move around network
Maintaining high capacity by ensuring UE is always served by best cell
Intra-layer
Inter-layer
Intra-System
Soft(er) Handover
Hard Handover
Inter-frequency
Intra-frequency
Intra-frequency
Inter-System(Inter-RAT)
Hard HandoverInter-frequency
WCDMA to GSMWCDMA to GPRSGSM to WCDMA
GPRS to WCDMA
WCDMA to WCDMA
Intra-layer
Inter-layer
Intra-layer
Inter-layer
Intra-layer
Inter-layer
RequiresCompressed
Mode or DualReceiver UE
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSPA
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Resource Manager (RM)
Responsible for managing the logical radio resources of the RNC in co-operation with
AC and PS
On request for resources, from either AC(RT) or PS(NRT), RM allocates;
DL spreading code
UL scrambling code
Also looks after code tree management (to maintain orthogonality); Initial code selection codes concentrated to same branch
Code de-fragmentation dynamic reallocation of codes as users enter/leave system
DL spreading code allocation for HSDPA users can be dynamic in RAS06
Code Type Uplink Downlink
Scrambling codes
Spreading codes
User separation Cell separation
Data & control channels from same UE Users within one cell
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Radio Resource Management Overview
Introduction
Load Control (LC)
Admission Control (AC)
Packet Scheduler (PS) incl. HSPA
Power Control (PC)
Handover Control (HC)
Resource Manager (RM)
RRM of HSPA (HSDPA, HSUPA & HSPA+)
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HSDPA - general principle
Fast scheduling is done directly in Node-B based on feedback information from UEand knowledge of current traffic state.
UE2
Channel quality(CQI, Ack/Nack, TPC)
Channel quality(CQI, Ack/Nack, TPC)
Data
Data
Users may be time and/or code multiplexed
New WBTS functions
HARQ retransmissions
Modulation/coding selection (16QAM)
Packet data scheduling (short TTI)
New WBTS functions
HARQ retransmissions
Modulation/coding selection (16QAM)
Packet data scheduling (short TTI)
UE1
0 20 40 60 80 100 120 140 160-2
0
2468
10121416
Time [number of TTIs]
QPSK1/4
QPSK2/4
QPSK3/4
16QAM2/4
16QAM3/4
InstantaneousEsNo[dB]
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Comparing HSUPA to R99 and HSDPA
HSUPA is 3GPP Rel6 Enhanced FDD Uplink
main characteristics:
Fast WBTS Packet Scheduling
Fast L1 HARQ algorithms
Fast Link Adaptation
2ms or 10ms TTI periods
Soft Handover SF down to SF = 2
Peak Rates up to 5.76 Mbps
Feature
Rel99
DCH
Rel5
HSDPA
Rel6
HSUPA
Var. spreading factor Y N Y
Fast power control Y N Y
Adaptive modulation N Y N
WBTS based scheduling N Y Y
Fast L1 HARQ N Y Y
Soft Handover Y N Y
TTI length [ms] 80,40,20,10 2 10,2
E-DCH
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HSPA+ Improvements
Improving the DL peak rates, cell throughput & spectrum efficiency:
64QAM: Enhanced HSDPA Modulation
MIMO: Intelligent Multi-Antenna Systems
DC-HSDPA: Dual-Carrier/Cell Transmission
Improving the cell throughput & spectrum efficiency:
DL Flexible RLC
CPC: Continuous Packet Connectivity CS Voice over HSPA
Peak Rates up to:
21 / 28 / 42 Mbps
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