1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER
DCN:
Title: Enabling Technologies for Multi-Radio Access Networks
Date Submitted: 17th March 2010
Presented at IEEE session #37 Orlando
Authors or Source(s):
Nageen Himayat (Intel)
Abstract: see title

2. IEEE 802.21 presentation release statements
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3. Enabling technologies for Multi-radio access networks3

4. Goals for Multi-Radio Access Interworking
Enhanced Spectrum Utilization
Synergistic use of unlicensed bands with (Virtual WiMAX Carrier)
Use of in unlicensed and lightly licensed spectrum
Manage Interworking of Multiple Radio Access Technologies with
provides control & management of multiple RATs (Converged Home)
enhances connectivity and cooperation for multi-radio devices (Mobile Hotspot)
Support Efficient Multi-Radio Operation at Subscriber terminal
Address “multi-radio” and “single-radio” device implementations
Protocol support to enable multi-radio integration

5. Usage Scenarios
Home Converged Gateway coordinates transmissions and assists “capillary networks”

6. Potential Techniques and their Advantages
Idea
Interworking Techniques
Advantages
WiFi Off-Load
Handoff to WiFi
Throughput gains ~3x for indoor users
Virtual WiMAX carrier
Carrier Aggregation
QoS/Load Balancing
Diversity /Redundancy
Reduced Control Overhead
Peak throughput (~2-3x)
Enhanced QoS
SINR (~3-5 dB), Lower Latency
Higher System Throughput
Mobile Hotspot
Connect LAN/PAN devices to WAN
Improves connectivity, coverage
Management & control with
Control of in-home LAN/PAN/BAN interfaces, P2P connectivity
Security
In-home services, automated configuration
Seamless operation across RATs
Multi-radio coexistence at Terminal
Protocols to support multi-radio integration
Efficient low-cost, low power devices
Multi-RAT co-existence at Network
Use of to allow communication between RATs
Facilitates spectrum sharing in ‘lightly licensed’ bands, and multi-radio implementation

7. Key Challenges for Network and Protocols
Determine interworking layer: IP, MAC or PHY Layer?
Address distributed, centralized and co-located multi-radio network interfaces
Define interworking functions and protocols (e.g. Generic link layer, Multi-radio resource management)
Measurements & reporting for application/link layer awareness across protocol stack
Coexistence of heterogeneous RATs in unlicensed or lightly licensed spectrum
Link awareness
Resource Mgmt.& QoS, Spectrum Management, Multi-radio Resource Management, Self Configuration
802.11
Generic Link Layer (GLL)
Resource/
Performance Monitoring,
Error & Flow Control, Access Selection
802.16
MILI
Application awareness
Others
*MILI=Media Independent Link Interface

8. Key Challenges for Devices
Interworking to address a mix of multi-radio and single radio devices
Higher integration at network level can lead to better multi-radio integration in terminal
Protocol support may be needed for
Coexistence: Managing interference across co-located radio transceivers
Cooperation: Managing interworking across multiple transceivers when hardware is shared
Cognition: Intelligent use of spectrum resources available in network with fully integrated hardware BB # 1 2 RF
ANT
Interference to Modem
from Modem
Coexistence
Cooperation
Increasing Hardware
Reuse
Cognition