Transcript Distributed Mobility Management
Distributed mobility management in the context of the MEDIEVAL project
MEVICO Final Seminar, part 2 23 rd November 2012
Carlos J. Bernardos, UC3M
Why MEDIEVAL?
• Video is a major challenge for the future Internet • Current mobile Internet IS NOT designed for video – Today’s architectures are very inefficient when handling video – Future mobile Internet architecture should be tailored to efficiently support the requirements of this type of traffic – Specific enhancements for video should be introduced at all layers of the protocol stack where needed
Our Vision
Evolutionary path for a truly video-for-all philosophy Mobile Network Provider Content Provider Video Content & Services Local Gateway WLAN Internet TV Personal Broadcasting Internet Video on Demand Video Content & Services Local Gateway LTE LTE Other Mobile Network Providers Interactive video Multimode terminal local mobility global mobility
The Consortium
MEDIEVAL is an operator-driven project specifying and demonstrating a mobile video architecture with cross-layer mechanisms to provide high quality of experience to users
DMM + CDN
MEDIEVAL has designed and is evaluating a mobile Internet architecture to efficiently support the upcoming growth of video services • • Based on the Distributed Mobility Management (DMM) paradigm Integrating the mobility services with video content distribution services – the DMM+CDN concept – Video caches are co-located with the mobility anchors of the DMM architecture
Why DMM?
• • Current Internet mobility schemes rely on a centralized mobility anchor. E.g.: – Home Agent (HA) in MIPv6 – Local Mobility Anchor (LMA) in PMIPv6 These entities are the cardinal node both for control and data plane – Hence they are prone to several problems and limitations • • • •
Longer (sub-optimal) routing paths Scalability issues Single point of failure Lack of granularity on the mobility service
Distributed Mobility Management
• The IETF community chartered a working group called Distributed Mobility Management (DMM) to develop new mobility solutions – http://datatracker.ietf.org/wg/dmm/ is the WG homepage – http://datatracker.ietf.org/doc/draft-ietf-dmm requirements/ is the first WG document – http://tools.ietf.org/id/draft-bernardos-dmm-pmip-01.txt
is the network-based mobility solution proposed by
MEDIEVAL
– http://tools.ietf.org/id/draft-bernardos-mext-dmm-cmip 00.txt
is the client-based solution proposed by MEDIEVAL
The MEDIEVAL DMM solution
• The central anchor is removed – The mobility services are pushed towards the edge of the network, offered in a distributed way by the access routers
The MEDIEVAL solution
•
A new node is introduced
– Mobility Access Router (MAR) • First IP-hop and default gateway seen by a Mobile Node (MN) • It implements the following functionalities defined by IETF standards: – Home Agent (HA) – Mobile IPv6, RFC 6275 – Local Mobility Anchor (LMA) – Proxy Mobile IPv6,
RFC 5213
– Mobile Access Gateway (MAG) – Proxy Mobile IPv6,
RFC 5213
The MEDIEVAL solution
• A set of interconnected MARs forms a Localized Mobility Domain (LMD) • Within the LMD, the mobility service is provided in a network-based fashion (PMIPv6-like) • The MN is not required to update its new location • MARs learn about the MN’s movements by means of a dedicated Layer 2 control infrastructure – IEEE 802.21 Media Independent Handover Services • The MNs’ mobility sessions are distributed among the MARs – MARs exchange Proxy Binding Update and Acknowledgement messages to update the MNs’ mobility sessions and set up the appropriate routing
Layer 2 Handover
• The handover is prepared, assisted and notified to upper layers using a dedicated control plane: – IEEE 802.21 Media Independent Handover (MIH) Services • Make-Before-Break handover – – Radio link degradation detection Resource availability query in surrounding Points of Attachment (PoA) – – Target selection and resource preparation before handoff Detachment and attachment detection • Vertical (i.e., inter-technology) handover support • Drives the whole handover phase by means of MIH users running in the terminal and in the network
IP mobility management (I)
• When a Mobile Node attaches to a MAR it gets an IPv6 prefix from the MAR’s prefix pool, with which it configures an address topologically anchored at the MAR • The MN starts communications with the just configured address • The MAR acts as standard IPv6 router for this flow – MN can send/receive traffic with no packet encapsulation MAR1 Pref1::Addr1 MAR2 MAR3
IP mobility management (II)
• • • Upon moving to a new MAR, the MN gets another IPv6 prefix to configure a new address In order to maintain ongoing communication, the new MAR sends a Proxy Binding Update message to the previous MAR, indicating its own address as the MN’s Care-of-Address (CoA) The old MAR replies with a Proxy Binding Acknowledgment message; a tunnel is established between the two MARs and flows can be delivered to the MN’s new location MAR1 MAR2 MAR3 PBU PBA Pref2::Addr2
IP mobility management (III)
• This situation for the green flow recalls PMIPv6, given that MAR2 acts as a MAG and MAR1 as the LMA • However, new communications are started using the IP address acquired from the MAR the MN is currently attached to – The new flow does not require tunnels nor special packet handling MAR1 MAR2 MAR3 Pref1::Addr1 Pref2::Addr2
IP mobility management (IV)
• When another handover occurs, the new MAR updates MN’s location at all the MARs anchoring active flows • A PBU/PBA handshake takes place with each of such MARs • Tunnels are moved/created and the flows are redirected MAR1 PBA Pref1::Addr1 MAR2 PBA MAR3 PBU PBU Pref3::Addr3
DMM + CDN (I)
• The DMM protocol allows to benefit from the shortest path from the MN to destination – – Because a new IP address is used by the MN for new IP connections Ongoing flows are maintained alive through the reachability of old addresses Applying this concept to video streams, MEDIEVAL enhances the quality of video delivery, by following the principle that a MN should
download the video from the MAR
it is currently attached to
DMM + CDN (II)
• • • • CDN nodes are co-located with MARs – MARs are provided with video caches Data delivery through HTTP progressive download – Video file fragmented into chunks, each chunk downloaded using HTTP If the requested content is available locally, the MAR starts sending it to the MN During the video playback, if the MN moves to another MAR: – – Current chunk is transferred using the mobility tunnel Next chunks are downloaded from the new MAR
DMM + CDN Demo
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The MN moves within a MEDIEVAL domain with heterogeneous access technologies, consuming a video stream while having a VoIP communication The MN starts being connected with 3G to MAR1 – The video is requested to the video server – MAR1 intercepts the request and sends the file to the MN The MN switches to WiFi and connects to MAR2 – The video is delivered by MAR2 – The VoIP flow is anchored to MAR1 The MN finally moves to LTE and MAR3 – The behavior is replicated in the new access network
Conclusion
• • Mobile data traffic is expected to greatly increase in future years (especially video) – Current mobility management solutions might not be able to cope with such large amount of traffic MEDIEVAL project’s objective is to design a mobile architecture optimized for video transport – The mobility management follows a distributed and dynamic approach • An hybrid scheme using both PMIPv6 and MIPv6 has been investigated as basesline for the development • The handover control is delegated to IEEE 802.21
• Controllers in the MN and in the network have been introduced to perform mobility at flow-level and on-demand
Thank you for the attention Questions?
http://www.ict-medieval.eu/