无线WiFi-认知无线网络的分类及未来发展前景
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7 Copyright © 2009 NICT. All Rights Reserved
Heterogeneous type cognitive radio system
Fundamental system architecture (Terminal has a spectrum sensing function)
Spectrum sharing type
Category by radio equipment
ห้องสมุดไป่ตู้
Base station
Terminal
Base station
Terminal
4 Copyright © 2009 NICT. All Rights Reserved
Heterogeneous type cognitive radio system
(a) Heterogeneous type cognitive radio
By sensing frequency bands that systems have been allocated on and time slots, users secure adequate bandwidth by selectingexisting systems.
Heterogeneous type cognitive radio system
Usage model 1 (Terminal has a spectrum sensing function)
Cognitive-based MIH(Media Independent Handover) and aggregation
Service area for new broadband systems is narrower than conventional one
Huge number of access points (or base stations) are needed to cover the area for conventional communication systems
interference
How to manage huge number of access points (base stations)
2 Copyright © 2009 NICT. All Rights Reserved
Definition of cognitive radio and two categories
NRM: the entity that manages the radio wireless networks and terminals for network-terminal-distributed optimization of spectrum usage. NRM may be implemented in a distributed manner.
6 Copyright © 2009 NICT. All Rights Reserved
Network reconfiguration
Operator 3
CNM (NRM)
5. Switch/ aggregate radio access networks (or operators)
CNM (NRM) 6. Start communication
Definition of cognitive radio and two categories
Cognitive radio/ Dynamic spectrum Access Network
Category by spectrum sensing method
Heterogeneous type
Operator1 NRM
NRM Operator 2
BS1
AP1
BS1
BS2
AP1
AP2
Sensing
TRM
Information exchange Information sharing
Sensing
TRM
TRM: the entity that manages the terminal for network-terminal-distributed optimization of spectrum usage within the framework defined by the NRM and in a manner consistent with user’ preferences and available context information
Single primary operator managed cognitive radio Operator NRM
Cognitive-based CIO (Carrier Independent Operation)
Multiple primary operators managed cognitive radio
Current frequency allocation method
Frequency (not allocated)
System A
System B
System C
Freq.
System A System B
System C Freq.
System A
System B
System C Freq.
2. Collect sensing info from terminals and decide network policy for users on the basis of the info
CNM (NRM)
Operator 1
CNM (NRM)
Operator 2
Crossnetwork signaling
3. Request network policy and send it from CNM to CTM
CNM may be expressed as NRM (Network reconfiguration manager) CTM may be expressed as TRM (Terminal reconfiguration manager)
Reconfiguration
1. Sense radio link quality (sensing info)
CTM (TRM)
4. Decide radio access technologies and/or operators using user’s preference and network policy
Cognitive radio is a radio or system that senses, and is aware of, its operational environment and can dynamically and autonomously adjust its radio operating parameters accordingly by collaborating wireless and wired networks
E-mail: harada@nict.go.jp
Background for the reason why cognitive radio network is needed
New systems need broader bandwidth than conventional one
There is not sufficient frequency band to assign future broadband wireless communication systems -> new assignment methods are needed
TRM manages sensing and sends the info to NRMs . NRMs manage to sense RAN-related context info and make policy using terminal-related and RAN-related context info. TRM receives the policy and finally decides frequency bands and communication systems to be used.
3 Copyright © 2009 NICT. All Rights Reserved
(b) Spectrum sharing type cognitive radio
By sensing vacant frequency band and time slot, users secure adequate bandwidth by bundling vacant freq. bands.
Several radio communication systems may need to co-exist in a common frequency band
Reduction of contamination by interference between radio communication systems is needed
Overview
Heterogeneous type cognitive radio system is a dynamic spectrum access network that selects optimal radio access networks (RANs) or operators and radio access technologies (RATs) based on collaboration between cognitive terminal manager (CTM) and cognitive network managers (CNMs) via cross-network signaling
TRM connects with terminal measurement controller (TMC) and terminal reconfiguration controller (TRC) TMC: the entity that collects terminal-related context information and provides it to TRM TRC :the entity that enables reconfiguration of terminal on the basis of TRM’s decision
Overview Usage model Fundamental system architecture R&D items Current research results in NICT
5 Copyright © 2009 NICT. All Rights Reserved
Heterogeneous type cognitive radio system
Wireless China Industry Summit Sept. 2 2009
Categorization and Future Prospect of Cognitive Wireless Network
Hiroshi Harada, Ph.D. SDR Forum Board of Directors; Director of Ubiquitous Mobile Communication Group, National Institute of Information and Communications Technology (NICT) 3-4 Hikarino-oka, Yokosuka, Kanagawa, 239-0847, Japan
System A
System B
Frequency (not allocated)
System C
Freq.
New standardized System
How to assign frequency band for new standardized wireless communication systems
Some access points may be interfered each other
Reduction of contamination by interference between radio communication systems is needed
Current frequency allocation
Heterogeneous type cognitive radio system
Fundamental system architecture (Terminal has a spectrum sensing function)
Spectrum sharing type
Category by radio equipment
ห้องสมุดไป่ตู้
Base station
Terminal
Base station
Terminal
4 Copyright © 2009 NICT. All Rights Reserved
Heterogeneous type cognitive radio system
(a) Heterogeneous type cognitive radio
By sensing frequency bands that systems have been allocated on and time slots, users secure adequate bandwidth by selectingexisting systems.
Heterogeneous type cognitive radio system
Usage model 1 (Terminal has a spectrum sensing function)
Cognitive-based MIH(Media Independent Handover) and aggregation
Service area for new broadband systems is narrower than conventional one
Huge number of access points (or base stations) are needed to cover the area for conventional communication systems
interference
How to manage huge number of access points (base stations)
2 Copyright © 2009 NICT. All Rights Reserved
Definition of cognitive radio and two categories
NRM: the entity that manages the radio wireless networks and terminals for network-terminal-distributed optimization of spectrum usage. NRM may be implemented in a distributed manner.
6 Copyright © 2009 NICT. All Rights Reserved
Network reconfiguration
Operator 3
CNM (NRM)
5. Switch/ aggregate radio access networks (or operators)
CNM (NRM) 6. Start communication
Definition of cognitive radio and two categories
Cognitive radio/ Dynamic spectrum Access Network
Category by spectrum sensing method
Heterogeneous type
Operator1 NRM
NRM Operator 2
BS1
AP1
BS1
BS2
AP1
AP2
Sensing
TRM
Information exchange Information sharing
Sensing
TRM
TRM: the entity that manages the terminal for network-terminal-distributed optimization of spectrum usage within the framework defined by the NRM and in a manner consistent with user’ preferences and available context information
Single primary operator managed cognitive radio Operator NRM
Cognitive-based CIO (Carrier Independent Operation)
Multiple primary operators managed cognitive radio
Current frequency allocation method
Frequency (not allocated)
System A
System B
System C
Freq.
System A System B
System C Freq.
System A
System B
System C Freq.
2. Collect sensing info from terminals and decide network policy for users on the basis of the info
CNM (NRM)
Operator 1
CNM (NRM)
Operator 2
Crossnetwork signaling
3. Request network policy and send it from CNM to CTM
CNM may be expressed as NRM (Network reconfiguration manager) CTM may be expressed as TRM (Terminal reconfiguration manager)
Reconfiguration
1. Sense radio link quality (sensing info)
CTM (TRM)
4. Decide radio access technologies and/or operators using user’s preference and network policy
Cognitive radio is a radio or system that senses, and is aware of, its operational environment and can dynamically and autonomously adjust its radio operating parameters accordingly by collaborating wireless and wired networks
E-mail: harada@nict.go.jp
Background for the reason why cognitive radio network is needed
New systems need broader bandwidth than conventional one
There is not sufficient frequency band to assign future broadband wireless communication systems -> new assignment methods are needed
TRM manages sensing and sends the info to NRMs . NRMs manage to sense RAN-related context info and make policy using terminal-related and RAN-related context info. TRM receives the policy and finally decides frequency bands and communication systems to be used.
3 Copyright © 2009 NICT. All Rights Reserved
(b) Spectrum sharing type cognitive radio
By sensing vacant frequency band and time slot, users secure adequate bandwidth by bundling vacant freq. bands.
Several radio communication systems may need to co-exist in a common frequency band
Reduction of contamination by interference between radio communication systems is needed
Overview
Heterogeneous type cognitive radio system is a dynamic spectrum access network that selects optimal radio access networks (RANs) or operators and radio access technologies (RATs) based on collaboration between cognitive terminal manager (CTM) and cognitive network managers (CNMs) via cross-network signaling
TRM connects with terminal measurement controller (TMC) and terminal reconfiguration controller (TRC) TMC: the entity that collects terminal-related context information and provides it to TRM TRC :the entity that enables reconfiguration of terminal on the basis of TRM’s decision
Overview Usage model Fundamental system architecture R&D items Current research results in NICT
5 Copyright © 2009 NICT. All Rights Reserved
Heterogeneous type cognitive radio system
Wireless China Industry Summit Sept. 2 2009
Categorization and Future Prospect of Cognitive Wireless Network
Hiroshi Harada, Ph.D. SDR Forum Board of Directors; Director of Ubiquitous Mobile Communication Group, National Institute of Information and Communications Technology (NICT) 3-4 Hikarino-oka, Yokosuka, Kanagawa, 239-0847, Japan
System A
System B
Frequency (not allocated)
System C
Freq.
New standardized System
How to assign frequency band for new standardized wireless communication systems
Some access points may be interfered each other
Reduction of contamination by interference between radio communication systems is needed
Current frequency allocation