SON in IEEE 802.16m system IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/1275r1 Date Submitted: 2008-10-31 Source:

SON in IEEE 802.16m system

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/1275r1 Date Submitted:

2008-10-31Source: Lei Jin, Libra Xiao, Hongzhuo Zhang, Changhoi Koo Voice: [Telephone Number (optional)]

Huawei Technologies E-mail: [email protected] [email protected]

*<http://standards.ieee.org/faqs/affiliationFAQ.html>Venue: TGm SDD: SON

Base Contribution: Non

Purpose: To be discussed and adopted by TGm for the 802.16m SDD Notice:

This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein.

Release:The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that

this contribution may be made public by IEEE 802.16.

Patent Policy:The contributor is familiar with the IEEE-SA Patent Policy and Procedures:

<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

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Contents

• Introduction– Basic Requirements– SON Structures– SON for IEEE802.16m protocol structure

• Self Configuration– Automated Configuration and Neighbor Relation– Cell parameters and Coverage Re-configuration

• Self Optimization– Coverage and Capacity Optimization– Inter-System Automatic Neighbor Relation – Load Balancing– Mobility robustness optimization

• Proposed ToC

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Basic Requirements

• Self-configuration– Allowing real plug and play installation of network nodes and cells

• Self-adaptation of the initial configuration• Update of neighbor nodes and neighbor cells

– Allowing fast re-configuration and compensation in failure cases.– Allowing dynamic re-configuration and planning based on the

environment

• Self-optimization– Allowing automated or autonomous optimization of network

performance • Service availability and QoS• Network efficiency• Throughput.• No any performance loss and degradation

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SON Structures

• Centralized Structure– SON engines are executed at the CSN

• Distributed Structure– SON engines are executed at the BS (or similar) level

• Hybrid Structure– SON engines are executed at the CSN and BS both

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SON Structures - Centralized Structure

• Simple, stable and easy to implement

• Latency and processing power• Information passing time

may be relatively longer due to geographical location

• Information transfer for SON could be an undesirable load for network

• Processing power depends on the centralised SON entity

MSMS

BSBS

Network Parameters& MeasurementControl

PerformanceIndicators

MS assisted measurement

CSN CSN

SON Function SON Function

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SON Structures - Distributed Structure

• Shorter latency time, flexible extendibility and transparent to network level.

• Inter-operability and security issues by different operators– The interface for SON operation between BSs – The coordination with multiple SON algorithms spread in multiple BS

CSN CSN

SON server SON server

SON FunctionSON Function Neighbor BS

Neighbor BS

BSBS

Related FunctionsRelated Functions

CSNCSN

IP address

Initial parameters

MSMS

MS assisted measurements

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SON Structures - Hybrid Structure

• Proposed structure for SON

• The functions locate in both CSN and BS partially.– Maximize the performance and utilization

– Intelligent and effective SON operation

CSN CSN

SON server(SON function)

SON server(SON function)

MSMS

Neighbor BSNeighbor BS

Initial

configuration

Initial

configuration

Report

Report CSNCSN

IP address

SON FunctionSON Function

BSBS

Related FunctionsRelated Functions

MS assisted measurements

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SON for IEEE 802.16m Protocol Structure• Self Organization block performs functions to support self configuration and self

optimization mechanisms and performs communication with the CSN having SON functionality. The functions include procedures to request RSs/MSs/CSN to report measurements for self configuration and self optimization and receive the measurements from the RSs/MSs/CSN.

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Self Configuration

• Automated Configuration and Neighbor Relation– Cell ID allocation and network deployment

• The proper cell ID for a new BS is derived from radio network planning

– Neighbor BS information update• BS ID may be semi-automatically configured by network planning

• When the new BS is installed, neighbor information is varied

– The BS automatically judges and selects information • Cell ID and frequency assignment of the neighbour BS

• Analyze and update the neighbor relation

• MS assisted measurement

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Self Configuration

• Cell Parameters and Coverage Re-configuration– The BS needs to adjust the cell parameters and

configurations• Due to duplicate cell region and to minimize the interference to the

neighbor cell

• A lack of air resources to be allocated into the MS

– Measurement, Adjustment and Report • MS feedbacks the relevant information to the serving BS.

• BS adjusts the cell parameters and cell coverage with proper messaging

• BS enforces the MS to handoff to the neighbor cell

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Self Optimization

• Coverage and Capacity Optimization– MS is in blind area

• Non-inter BS blind area : MS returns to the original serving BS.• Inter-BS blind area : MS goes to the neighbor BS.

– Measurement, Adjustment and Report• MS feedbacks the relevant information to the following serving BS.• BS reports to the SON function

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Self Optimization

• Inter-system Automatic Neighbor Relation– The BS/MS may generate interferences to the MS/BS in neighbors – Measurement, Adjustment and Report

• A MS in the cell needs to measure radio signal parameters and/or identify the interference source

• The BS achieves inter-coordination between BSs

System B

BS

MS MS

MS

associated associa

ted

asso

ciat

edSystem A

interferenceBS

associated

interference

MS

MS

MS

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Self Optimization

• Load Balancing– Cell and handover parameters reselection

• Redirections of the handover for load balancing due to the unequal traffic load and undesirable handover trials

• Reselection of the mobility parameters to the current cell/neighbor cells based on its load status

– Measure, Adjustment and Report• BS measures and adjusts the cell reselection/handover related

parameters based on its current cell status and the load information from neighbor BSs.

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Self Optimization

• Mobility Robustness Optimization – Expedite the handover procedures and Minimize the non-

suitable handovers• The target BS may not always be detected properly if a handover

was performed to a non-suitable cell or environment

– Measurement, Adjustment and Report• MS reports the failures to the serving BS.• BS judges and adjusts the cell selection/reselection parameters.

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Proposed Text (1/2)

18 Support for Self-organizationHybrid Structure is defined as the structure where part of the SON algorithms are executed in theCSN, while others are executed at the BS level.18.1 Self ConfigurationSelf-configuration process is the process where newly deployed BSs are configured by automaticInstallation procedures or existing BSs are re-configured with proper adjustment18.1.1 Automated Configuration and Neighbor Relation The cell Identity (ID) is an essential configuration parameter of a radio cell, it is the set of uniquesymbols for differentiating several types of cells (e.g. macrocell / femtocell / sector / relay). The automatic selection of new cell ID should assure that this cell ID is unique in both the wholecoverage of a cell and handover from the perspective of an MS.18.1.2 Cell parameters and coverage re-configurationCell parameter and Coverage re-configuration are achieved based on the cell status and BS’sresources availability. The BS may change the its cell coverage and its related cell parameters usingproper message transmission.

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Proposed Text (2/2)

18.2 Self OptimizationSelf-optimization process is the process where MS/BS measurements are used to auto-adjust thenetwork.18.2.1 Coverage and Capacity OptimizationThe Coverage and Capacity optimization aims to solve the coverage hole where MS can’t receive any effective signals from any BSs. Intra-BS and Inter-BS blind areas are defined. In case ofIntra-BS blind area the MS Returns to the serving BS if detecting the blind area and the MS goesto the neighbor BS if detecting the blind area in case of Inter-BS blind area18.2.2 Inter-system Automatic Neighbor RelationThe Inter-system Neighbor Relationship is defined for interference reduction when the BS in atleast one of these two systems creates non-acceptable interference to at least one MS in neighborsystem, or at least one of the MSs in at least one of these two systems creates non-acceptableinterference to the neighbor BS 18.2.3 Load BalancingSelf-Optimization of cell reselection/handover parameters is performed to cope with the unequaltraffic load and minimize the number of handovers and redirections needed to achieve the loadbalancing.18.2.4 Mobility Robustness OptimizationMobility Robustness Optimization is defined to automatically provide the robust mobility services. The mobility related parameters may be adjusted according to the collected information.