Cognitive radio networks for future open communciation

1
Cognitive radio networksfor future open
communciation
Global Standards Collaboration (GSC) 14
DOCUMENT GSC14-GRSC7-023
FOR Presentation
SOURCE ARIB
AGENDA ITEM 4.3
CONTACT(S) homa_at_nict.go.jp

• Homare Murakami, Hiroshi Harada
• NICT / ARIB

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Backgrounds- Current trends concerns -

• New Wireless systems are/will be available
• HSPA, LTE, 802.16e, 802.11n, 802.15.3c, UWB,
  Zigbee,
• Different characteristics and target use cases
• Coexistence
• Broadband systems need more bandwidth
• How to assign frequency band for new standardized
  wireless communication systems?
• How to extend the coverage area?
• How to increase the capacity for users?
• A flexible method to utilize and to manage
  spectrum is required to be studied.

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Dynamic Spectrum Access (DSA) - Two approaches to
utilize cognitive radio technology-

• Radio equipments sense its operational
  environment. As for sensing methods, two
  possibilities are envisaged
• Radio equipment senses vacant frequency band and
  period where no other communication systems are
  operated
• Radio equipment senses existing communication
  systems and checks its connectivity
• By sharing the sensing results between NWs and
  Terminals, radio equipments finally decides
  frequency band and communication systems to be
  used

White-space type dynamic spectrum access
(cognitive radio)
Sense vacant frequency band and period
System A
System B
System C
Freq.
Heterogeneous type dynamic spectrum access
(cognitive radio)
Sense existing communication systems
System A
System C
System B
Freq.
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Cognitive Wireless networks

• A cognitive wireless network that decides optimal
  radio access networks (or operators) and radio
  access technologies based on collaboration
  between Network Reconfiguration Managers (NRMs)
  and Terminal Reconfiguration Managers (TRMs) via
  Cross-network (or common) signaling.
• Link aggregation utilizing multiple RATs
• Users can gain desirable throughput via
  appropriate BSs and APs
• Operators are capable of improving spectrum usage
  efficiency by recommending a suitable RAT to
  attach for users

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Challenges - Cognitive radio devices and
equipments -

• Cognitive base station prototype
• TRM is implemented inside
• Sensing capability
• RSSI sensing (PHY level)
• 400MHz-6GHz
• System (RAT) detection
• 802.11b MAC
• Reconfiguration capability
• Tunable to vacant band
• with 802.11b MAC

Signal processing unit (FPGA base)
Signal processing unit (CPU base)
RF unit

• Cognitive mobile router prototype
• TRM is implemented inside
• WAN (Internet) access
• via HSDPA USB commercial card
• via PHS PCMCIA commercial card
• via 802.11b/g on board chip
• controllable by NRM
• LAN access
• via 802.11 b/g on board chip

• Software-Defined Cognitive terminal prototype
• TRM is implemented inside
• Sense spectrum over UHF to 6GHz band and show
  spectrum usage
• Indentify communication systems in selected
  frequency band by using SDR technology
• Show available and connectable communication
  systems

• Multi-band tunable
• Wide-range amplifier
• 0.4-6.2GHz (2 mode)
• Gain 30dB
• Output 24dBm
• NF more than 5dB

• Multi-band mixer
• 0.4-6GHz,
• 90nm RF-CMOS
• 3.3 V
• Multiband synthesizer
• 50mm 40mm

• Multi-band tunableWide-range RF filter
• Mode 1 0.40.8 GHz
• Mode 2 0.81.3 GHz
• Mode31.32.1 GHz
• Mode 4 2.13.0 GHz
• Mode 5 3.04.0 GHz
• Mode 6 4.46.0 GHz

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Next Steps/Actions (1/2) - Dynamic spectrum
access network -
Single/multiple primary operators and multiple
secondary operators managed dynamic spectrum
access network
Independent network
Primary operator 1
Primary operator 2
AP2
AP1
BS2
BS1
Sensing
Secondary operator 3
Secondary operator 4
Secondary operator 5
Secondary operator 6
BS5
BS3
BS6
BS4
AP5
AP3
AP6
AP4
Sensing
Secondary operators use frequency band and period
that primary operator does not use by sensing
spectrum and link quality.
CNM/NRM (management control)
sensing info.
signaling
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Next Steps/Actions (2/2)- Harmonization of
standardization activities -
Europe
United States
ITU-R WP1B, 5A

• IST FP7
• E3
• Oracle
• Sendra

DARPA XG
IEEE 802 802.21,802.22
SDR Forum
IEEE SCC41 1900.1,2,3,4
ETSI RRS
IEICE TCSR
MIC dynamic spectrum access project
Standardization body
CWC(NICT)
Promotion group
Japan
RD Project