IEEE COMMUNICATIONS MAGAZINE, JAN.,2009

資工碩二697410070程鈞彥

Architecture and Enablers for Optimized Radio Resource Usage in Heterogeneous Wireless Access Networks: The IEEE 1900.4 Working

GroupIEEE Standards in Communications and

Networking

Outline

Introduction to IEEE 1900 WGsMotivationSystem ApproachReference use casesSystem RequirementsSystem ArchitectureConclusions

Introduction to IEEE 1900 WGs

The objective of 1900 is to develop standards in the areas of dynamic spectrum access (DSA), cognitive radio(CR), interference management, coordination of wireless systems, and advanced spectrum management, among others.

IEEE Standards Coordinating Committee 41 (SCC 41), “Dynamic Spectrum Access Networks”.

Introduction to IEEE 1900 WGs

IEEE 1900 WGs 1900.1 (completed) 1900.2 (approved) 1900.3 1900.4 1900.5 1900.6

Introduction to IEEE 1900 WGs

IEEE 1900.4 IEEE 1900.4 was published on February 27th 2009. From April 2009, 1900.4 Working Group works on two

projects IEEE 1900.4a IEEE 1900.4.1

Introduction to IEEE 1900 WGs

The purpose of IEEE 1900.4 to improve overall composite capacity and quality of

service of wireless systems in a multiple radio access technologies environment, by defining an appropriate system architecture and protocols which will facilitate the optimization of radio resource usage, in particular, by exploiting information exchanged between network and mobile terminals, whether or not they support multiple simultaneous links and dynamic spectrum access.

Introduction to IEEE 1900 WGs

This purpose is achieved by defining – building blocks comprising

(i) network resource managers, (ii) device resource managers, and (iii) the information to be exchanged between the

building blocksfor enabling coordinated network-device distributed decision making which will aid in the optimization of radio resource usage, including spectrum access control, in heterogeneous wireless access networks

System Assumptions

System Approach

The two key management entities network reconfiguration manager (NRM) terminal reconfiguration manager (TRM)

Composite wireless network (CWN) The composition of a heterogeneous wireless

environment with 1900.4 management entities

Radio enabler (RE) A logical communication channel corresponding to

this interface(enabling optimization between NRM and TRM)

Reference use cases

Three use cases Dynamic spectrum assignment

provides the process and mechanisms to dynamically assign frequency bands to RANs within CWN, operating at given location and time.

Dynamic spectrum sharing provides the process and mechanisms for a type of

spectrum access that occurs when different RANs and terminals dynamically access spectrum bands that are overlapping, in whole or in part, causing less than an admissible level of mutual interference.

The distributed radio resource usage optimization use case covers the process and mechanisms by which the

optimization of radio resource usage is performed by the CWN and terminals in a distributed manner.

Reference use cases

System Requirements

Context Awareness RAN context information Terminal context information

Decision MakingNRMTRMReconfiguration

System Requirements

Reconfiguration Obtaining the context information required for

decision making Making reconfiguration decision The actual reconfiguration according to the decision

made

System Architecture

Network side entities Operator Spectrum Manager (OSM) is the entity that

enables operator to control dynamic spectrum assignment decisions of the NRM

RAN Measurement Collector (RMC) is the entity that collects RAN context information and provides it to the NRM

Network Reconfiguration Manager (NRM) is the entity that manages the CWN and terminals for network-terminal distributed optimization of radio resource usage and improvement of QoS

RAN Reconfiguration Controller (RRC) is the entity that controls reconfiguration of RANs based on requests from the NRM

System Architecture

Terminal side entities Terminal Measurement Collector (TMC) is the entity

that collects terminal context information and provides it to the TRM

Terminal Reconfiguration Manager (TRM) is the entity that manages the terminal for network-terminal distributed optimization of radio resource usage and improvement of QoS within the framework defined by the NRM and in a manner consistent with user preferences and available context information

Terminal Reconfiguration Controller (TRC) is the entity that controls reconfiguration of terminal based on requests from the TRM

System Architecture

Interfaces TMC ---- TRM TRM ---- TRC OSM ---- NRM RMC ---- NRM NRM ---- RRC NRM ---- TRM

Functional Architecture

NRM Functions Policy derivation Policy efficiency evaluation Network reconfiguration decision and control Spectrum assignment evaluation Information extraction, collection, and storage RAN selection

TRM Functions Terminal reconfiguration decision and control Information extraction, collection and storage RAN selection functions

Functional Architecture

Information Model

Uses an information model based on an object-oriented approach Policy, terminal, and CWN classes

Conclusion

This article has presented a snapshot of IEEE 1900.4, outlining its purpose, scope, reference use case, system assumptions, system architecture, information model, and other facets of the developing standard.

References

Tutorial: IEEE 1900.4 overview, http://grouper.ieee.org/groups/scc41/4/IEEE-1900.4-Overview-2009-01-07.pdf