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Agenda. Agenda. What is so different from GSM?. Number of different Radio Bearers Speech, video, streaming, up to 128/384 PS, up to 384/HS Combinations of different Radio Bearers Number of features in Radio Network Connection Handling and Channel Switching Handover and Power Control

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what is so different from gsm
What is so different from GSM?
  • Number of different Radio Bearers
    • Speech, video, streaming, up to 128/384 PS, up to 384/HS
    • Combinations of different Radio Bearers
  • Number of features in Radio Network
    • Connection Handling and Channel Switching
    • Handover and Power Control
    • Significant impact on RAN capacity
  • Number of features in Transport Network
    • Inverse Multiplexing over ATM
    • AAL2 Quality of Service separation
    • AAL2 switching and Transport Aggregation
slide4

WCDMA Network Topology

CS Core

MGW

MSC/Call Server

Iu CS

Mur

Iu

ATM Switch

Mut

Mub

Iub

Iu PS

RNC

Iub

Iur

ATM Switch (RXI/MSN)

WCDMA RAN

RBS/NodeB

Mub

SGSN

Uu

PS Core

RNC

GGSN

RBS/NodeB

general features of a wcdma ran
General Features of a WCDMA RAN
  • Wide bandwidth
    • Chip Rate of 3.84 Mcps
    • Bandwidth of 5 MHz
    • The wide bandwidth reduces sensitivity to muti-path fading
  • Power Control
    • Common shared resource that makes WCDMA RAN flexible
    • Allocates power to each subscriber and ensures that each user and service creates the minimum of interference
  • One-cell Frequency Reuse
    • Supported by RAN through Orthogonal Variable Spreading Factor (OVSF) codes for channelization of different subscribers

Agenda

general features of a wcdma ran1
General Features of a WCDMA RAN
  • Frequency Division Duplex
    • Used when UL and DL are on different frequencies
  • Macro Diversity
    • Used for transmission between Ue and RBS
    • Allows simultaneous use of links between the Ue and two or more RBS’s
    • Provides smooth transition as Ue moves:
      • Between cells of the same RBS (softer handover)
      • From one RBS to another (soft handover)

Agenda

hsdpa high speed downlink packet access
HSDPA High Speed Downlink Packet Access
  • Speed
    • More advanced audio & video content & larger file transfers
    • Reduced down load time
    • Peak data rates 8 -10 Mbps

=> Improved end-user experience

  • Less delay
    • Web browsing (WWW)
    • New services with very high requirements on response times, e.g. gaming applications

=> Improved end-user experience

  • Capacity

=> Reduces the cost per Mbyte for operators

  • HS-DSCH coverage as good as R99: => No need for new sites

Agenda

slide9

UMTS Network

TE

MT

WCDMA

RAN

CN Iu

edge

node

CN

Gateway

TE

End-to-End Service

TE/MT Local

Bearer Service

UMTS Bearer Service

External

Bearer Service

RAB

CN Bearer

Service

Radio Access Bearer (RAB)

Agenda

rab examples
RAB Examples

Conversational Speech

12.2 kbps Circuit switched

Conversational CS Data

64 kbps Circuit switched

Streaming

57.7 kbps Circuit switched

Variable rate Packet switched

Interactive

Combination of Conversational Speech and Interactive 64/64

Multi-RAB

Agenda

wcdma ran end to end view

RXI

820

RNC

3810

RBS

3000

RBS

3000

or

WCDMA RAN: End-to-end view

end-to-end application traffic

PDCP

PDCP

RLC

RLC

MAC

MAC

WCDMA

PHY L1

WCDMA

PHY L1

AAL2

AAL2

AAL2

AAL2

AAL2

AAL2

AAL2

AAL2

ATM

ATM

ATM

ATM

ATM

ATM

ATM

ATM

Transmission

Transmission

Transmission

Transmission

Transmission

Transmission

Transmission

Transmission

RNC

Node B

ATM Switch

UE

Agenda

inter radio access technology rat handover

Inter RAT Handover

Using the WCDMA Frequency

Using the GSM Frequency

WCDMA Coverage

GSM Coverage

Road

Inter Radio Access Technology (RAT) handover

Agenda

sample rollout timeline of 1rnc 200 rbs
Sample rollout timeline of 1RNC/200 RBS

Standard 8wks delivery However can be quicker.

This phase dependent on total RBS count and weekly run rate

TCM can actually start to generate script as soon as ATND is done.

Agenda

access transport network design
Access Transport Network Design
  • What is ATND?
    • RAN Topology Model
    • ATM Aggregation Strategy
    • Transport Network Topology towards Circuit and Packet Domain
    • Transport Network Topology between RNCs
    • Optimizing Node B Clusters Connectivity within the RNS
    • RNC Iub, and Iur Dimensioning
    • QoS Design - Coordination of ATM Service Category and Traffic Descriptors
wcdma access transport network design
WCDMA Access Transport Network Design
  • Why?
    • To effectively plan new networks and enable utilization of existing transport infrastructure for transportation of WCDMA services and applications
    • Future proof network planning and design (growth & expansion)
    • Design consideration to meet key operational and future optimization requirements
    • Design of ATM network characteristics to aim for optimum end-user perceived quality
    • Resilience and Recovery
wcdma access network problem statement
WCDMA Access Network – Problem Statement
  • How can I achieve a balanced RAN Transport Design that meets my short, medium and long term goals?
  • What are my design considerations to ensure a future proof network planning & design?
  • How do I handle configuration of additional T1 capacity for user data?
  • Do I need to establish further redundancy in my network?
  • How do I know my Iub and Iur dimensioning can meet my forecast?
  • How many ATM PVCs should I have for user and signaling data?
3g access transport network design

ATM Aggregation

Ericsson WCDMA TN

Transmission

2G TN

3G Access Transport Network Design

Payload on AAL2

WCDMA Application

Channels

ATM Adaptation

Layer

WCDMA RAN

Transport

ATM Layer

Physical

Layer

Common

Transmission

atnd process flowchart

Nominal Cell Plan

Topology Model

Development

No

RBS, Cluster, PoC

Capacity Calculation

SDH

Pre-Planning

RNC

Iub, Iur, Iu

Dimensioning

Topology &

Capacity OK?

Nominal Transport

Plan

Detailed Cell Plan

Yes

Physical Link

Detailing

Physical Circuit

PVC Detailing

Detailing

Detailing

RBS/RXI/RNC

Detailing

Link & Node

Specification

Detailed Transport

Plan

ATND Process Flowchart
slide19

Acceptance and

Conclusion

Information

Gathering

Start-Up ofProject

Access Transport

Network Planning

Review and Finalize

ATND Spec

ProjectPlan

Detailed Transport

Network

Design

RAN Access Transport Network Design Process

Requirement Specification

SolutionSpecification

Network Design

Report

High Level Design Specifications

Detailed Design Specifications

- Network Design activities

-Network Design service deliverables

atnd service deliverables
ATND Service Deliverables
  • Deliverables
    • Project Management
    • Knowledge transfer
    • ATND Network Topology
    • Requirements on external transport infrastructure
    • Logical Network Layout
    • Physical Port Layout
    • Control Layer signalling design
    • Basic IP Addressing Plan
    • UTRAN Network Modelling
    • Iub and Iur design
    • ATM/AAL2 QoS and traffic descriptors
    • Design of MTP3b Signaling POC for Iu/Iur interfaces
    • Final report containing detailed design specification document
    • Complete ATND Questionnaire for network roll-out
  • Design Input:
    • Overall E2E Architecture
    • Forecast of number of customers, Services and Deployment
    • Traffic profile
    • Existing Transport Network Infrastructure
    • IP Address Space
    • SS7 Signaling Point Codes
    • Possible / Preferred Location of New Equipment
    • Preferences on Network Design
atnd experience lessons learned
ATND Experience & Lessons Learned
  • RAN Access Transport Design is a long, complex and iterative negotiating process involving
    • RF Design
    • Circuit Core Network Design (possibly from another vendor)
    • Packet Core Network Design (possibly from another vendor)
    • RAN-Core Transport Interconnect
    • Configuration Mgmt &
    • Network Rollout
  • Requires in-depth competence and experience not only with General ATM & Sonet, but also with the RAN Vendor implementations of ATM and Sonet
  • Design is only done on paper, translating this into implementation requires extensive coordination with multiple organizations
  • Requires a good understanding of short, medium & long term requirements while maintaining a healthy balance between all of them
experience lessons learned cont
Experience & Lessons Learned Cont.
  • RAN Access Transport Design should be coordinated together with Core Network Design
    • ATM PVCs, ATM VPI and VCI Addressing Schemes
    • IP Addressing
    • Signaling & User Plane dimensioning and design
  • Some key access transport design aspects that require special attention
    • Access Transport (ATM) Aggregation Strategy
    • Striking the right balance of the available capacity between
      • Voice
      • R99 Packet data
      • HSDPA
    • RBS distribution within the RNC
    • Capacity vs. Redundancy issues
packet core network design service
Packet Core Network Design Service

What is included

  • SGSN Questionnaire (CIQ)
    • SGSN Node properties
    • Iu-PS interface
    • Gn/Gp interface
    • Gom interface
    • Gr interface
  • Only 10 RNCs per SGSN due to Cingular Requirements

Agenda

core network design cs
Core Network Design (CS)
  • High level Design and a Proposed Architecture Solution Topology
    • Identifies nodes, functions and capacity, including high-level routing policies, robustness and redundancy
    • High level inter-site traffic figures/Call flows
    • Signaling design and synchronization
  • Detailed Node Design (MSC Server & MGw)
    • Traffic profile used for design/dimensioning
    • MSC-S capacity (CPU and memory)
    • Link dimensioning (SS7 and SIGTRAN (GCP,BICC,MAP,RANAP))
    • T1 mapping/PCM range allocation)
    • IU design / Port assignments
    • "Traffic to SIGTRAN route assignments in MGW and MSC-S
core network design ps
Core Network Design (PS)
  • High level Design and a Proposed Architecture Solution Topology
    • Packet Network Topology Model per region, including connectivity design, routing, robustness and redundancy
    • High level inter-site traffic figures/Call flows (Intra and Inter SGSN)
    • Signaling design and synchronization
  • Detailed Node Design
    • Traffic profile used for design/dimensioning
    • Planning connection to other PLMNs - Gp as applicable
    • Gn, Gi & Gom Planning
    • Iu OC-3 Link Dimensioning
    • IuPS Traffic Descriptors
    • RNC ID Numbering Scheme and IP Addressing Scheme
    • Support system (DNS/NTP)
    • SS7 dimensioning (Gr)
core design service deliverables
Core Design Service Deliverables
  • Design Input:
    • Overall E2E Architecture
    • Forecast of number of customers, Services and Deployment
    • Traffic profile
    • Existing Transport Network Infrastructure
    • IP Address Space
    • SS7 Signaling Point Codes
    • Possible / Preferred Location of New Equipment
    • Preferences on Network Design
  • Deliverables
    • Project Management
    • High level design and network architecture (planning phase)
    • Detailed network design including a final report containing detailed design specification document
    • Complete and ready design Questionnaire for network roll-out
o m network design
O&M Network Design
  • Deliverables
    • Detailed IP addressing plan
    • Dimensioning for RAN Mut, Mub and Mur interfaces, COMINF services dimensioning
    • Citrix, Alex and netback up dimensioning
    • O&M network topology OSS RC/COMINF servers
    • Planning network connectivity through FW and O&M Router/s
    • O&M VLANs for O&M and backup traffic
    • Ethernet switch ports planning
utran tools and analysis
UTRAN tools and analysis
  • Performance statistics (Radio and Transport, GPEH)
    • Analysis and "data mining" to identify performance improving actions
  • Call flows (UETR, TEMS, Protocol Analyzer)
    • Root cause analysis of unexpected behavior
  • Logs (Alarm, Event, Availability, NE error logs)
    • Analysis to identify network instability and possible software or configuration faults

Need of End-to-End UMTS knowledge to understand how different parts of the system (UE, Radio Network, Transport Network, Core Network) affect the overall performance and user experience.

lessons learned from similar projects
Lessons learned from similar projects
  • T1 quality has been a problem in RF tuning
    • Log file analysis to classify dropped calls
    • Initiated a process to collect statistics for T1 quality monitoring and open CTS tickets based on them
  • GPEH analysis to identify missing neighbors
    • Supported first round of RF tuning with two sets of GPEH analysis to identify missing neighbor definitions
  • Identified AAL2 setup problem in the Core Network
    • Access failure root cause was identified and isolated to CN
    • Detailed analysis and testing was performed in one market to provide a workaround to UMSCs across the markets
lessons learned from similar projects1
Lessons learned from similar projects
  • IRAT (UMTS to GSM handover)
    • UTRAN had the leading role in IRAT configuration and testing nationally
    • IRAT problem on I-5 North was isolated to Los Angeles GSM network and successfully resolved
    • Reason for current poor IRAT KPIs was identified and isolated to the Core/GSM Network
  • Uplink interference investigation
    • UTRAN has been supporting the ongoing uplink interference investigation with snapshot and average values of interference and transmitted code power