RAN P6 TUNNING

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WCDMA RAN P6 Tuning

Chapter 6: HSPA Tuning

Top right corner for field-mark, customer or partner logotypes. See Best practice for example.

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© Ericsson AB 2008 06_03813 LZU 108 6919 Uen Rev A. Figure 6 - HSPA Tuning2

Chapter 6 Objectives

After this module, the participants will be able to:1. Understand the process of HSDPA Tuning

2. Define and show different performance indicators using TEMS Investigation

3. Explain accessibility, retainability and integrity

4. Post process data using TEMS Investigation

5. Analyze and interpret the collected data in order to improve: Accessibility, Retainability and Integrity

6. Implement changes in order to improve the performance of the Network


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HSDPA Concept Shared Channel transmission

High order modulation (16QAM – QSPK)

Short Transmission Time Interval (TTI)

Fast Link Adaption (based on CQI)

Fast Scheduling (Round Robin, Proportional fair, equal rate, max CQI)

Fast HybridAutomatic repeat request (HARQ)


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HSDPA Tuning Workflow

R99 radio network tuning

completed

HW + SW installation

HW drive tests, implementation and verification

SW drive testsimplementation and verification

Pilot scanningUE – CS data servicesUE – PS data services

RAX, TXB upgradeTransmission expansionDefault parameter settingsHSDPA feature deployment

Reduce interferenceImprove coverageImprove SHO areas

Improve throughputReduce interferenceImprove BLER


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HSDPA Preparations

Software for RBS, RNC, RXI and RANOS need to be upgraded

HS–TXB and HS-RAXB needs to be implemented in the RBS

Transport Network Expansion check Iub SGSN configuration Files of different sizes Setting of the TCP windows


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Settings of TCP window

Latency = 88 ms for 5-6 Mbps I byte = 8 bits

Bandwidth delay product – (Bandwidth x latency)/8 kByte ex 64 kByte

Proposed window size = 2 x bandwidth delay product

– Ex 2x 64 kByte = 128 kByte


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HSDPA Interference

100% power will be used – Noise floor will rise

Non-power control channels such as Cpich need to be increased – power into neighbouring cells

High sites generate interference outside the planned coverage area

Tilting antenna is an efficient way of achieving confined cells


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HSDPA Handover

Hard Handovers are used – more sensitive to interference

HS–DSCH is not power controlled – Rate controlled


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HSDPA Power Parameters

The power parameters for common control channels should be increased (primaryCpichPower)

The power of the R99 channels should be verified.


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HSDPA Traffic Case call setup


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Configuration and Capacity Allocation


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HSDPA cell change


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HSDPA Throughput concept


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HSDPA Throughput


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Retransmission rate


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UE CapabilitiesUE Category Modulation technique Max Throughput

Cat 1 16QAM + QPSK 1200 kbps










Cat 11 QPSK 900 kbps

Cat 12 QPSK 1200 kbps


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Examples of rates for EUL

Maximum provided (Mbps): Category 1 Category 3

#Codes SF 4 2xSF 4

Modulation QPSK QPSK

MAC-e layer (incl header) 0.7110 1.4488

MAC-e layer (excl. MAC-e/es header, padding, 10% MAC-e BLER) 0.699 1.430

Theoretical maximum RLC user data throughput 0.672 1.376

RLC layer (excl. RLC header, 1% RLC signaling)[1] 0.659 1.349

Application layer (excl. TCP/IP header)[2]

0.641 1.313


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RAN P6 TUNNING

Engineering

Transcript of RAN P6 TUNNING