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Requirements for NETLMM
Protocol: 802.16e Mobile BWA*
Perspective
Prakash Iyer
Perviz Yegani
63rd IETF, Paris
NETLMM BOF
BWA – Broadband Wireless Access
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WiMAX/802.16e Mobile BWA
• Mobile WiMAX (based on 802.16-2004 amended
by 802.16e) is an emerging standard for
broadband, wide-area wireless access
– Optimized for IP services
• Usage will be characterized by
– High average/peak data rates to subscriber terminals
compared to traditional 3G networks
– Mix of audio, video, data and voice applications
• Symmetric and asymmetric UL and DL traffic, real-time and
non-real-time
– Mobility rates exceeding 200 km/hr while satisfying
ITU-T and other benchmarks for low handover packet
loss, latency, jitter and delay
– Need to support low power modes
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Mobile WiMAX – E2E Architecture
Perspective
BS
All-IP
Access Service
Network (ASN)
BS
BS
Applications
Service Network
IP Connectivity
Service Network
(CSN)
All-IP
Access Service
Network (ASN)
BS
INTERNET
• Mobility Management Requirements:
– Need two-level MM hierarchy
• ‘Make-Before-Break’ HO within and across ASN – could eliminate need for complex
over-the-air MM primitives
• Client to remote CSN HO could be delayed and seamless over ASN anchored paths
– Must support notion of separate Network Access (ASN) Provider – NAP and
Network Service (CSN) Provider - NSP i.e. different security domains
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– Seamless integration between localized and E2E MM protocols
Mobile WiMAX – ASN Variants
BS
BS
To
Anchor Router / CSN
IP Cloud
Gateway
ASN
BS +
Router
IP Cloud
To
CSN
BS +
Router
• Mobility Management Requirements:
– Must accommodate Flat and Hierarchical ASN topologies – and variants
thereof
– Must support multi-hop relay among BSs
– Must support multi-path configurations among BSs
– Eliminate need for signaling from client to ASN for intra/inter ASN MM
• Ideal scenario is network-based MM both within/across ASN and end-to-end
– Must work irrespective of client connectivity state – Active, Idle
– Client IP reachability in all power states with configurable location
anonymity
– IPv4 and IPv6
– Eliminate / reduce need to simulcast within ASN for duration of HO –
prevent backhaul BW wastage especially for wireless backhaul
4
Multi-Access Support
BS
WiMAX ASN
Applications
Service Network
BS
IP Connectivity
Service Network
(CSN)
BS
Beyond 3G
Evolved ASN
INTERNET
BS
• Mobility Management Requirements:
– Seamless client-transparent inter-technology ASN
HOs and anchoring across ASNs
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Summary
• Traditional E2E IP MM protocols (e.g. MIP) are
not adequate for needs of MBWA and Next-Gen
multi-access wide-area networks
• Need for a localized MM protocol
– Optimized for handover performance of different
application classes, client power-management states
and IP reachability
– Support
• Unbundled provider domains
• ASN topology variants
• Heterogeneous access networks integrated via common IP
core
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