SDN- based Mobile Networking for Cellular Operators. Seil Jeon, Carlos Guimaraes, Rui L. Aguiar

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1 SDN- based Mobile Networking for Cellular Operators Seil Jeon, Carlos Guimaraes, Rui L. Aguiar

2 Background The data explosion currently we re facing with has a serious impact on current cellular networks that are highly centralized

3 Current mobile architecture deployed (3GPP- based) K. Pen=kousis and P. Ber=n, Mobility management in infrastructure networks, IEEE Internet Compu=ng, vol., no., pp.,

4 Current mobile architecture deployed (IP- based) K. Pen=kousis and P. Ber=n, Mobility management in infrastructure networks, IEEE Internet Compu=ng, vol., no., pp.,

5 Centralized mobility management architecture : Mobility Control Plane M- DP: Mobility Data Plane Data plane tunnel MD Mobility Protocol MN M- DP M- DP M- DP CN

6 Distributed mobility management architecture A key idea is to distribute mobility anchor func=ons into the edges AG AG/MA AG MA AG AG/MA AG/MA AG AG/MA Access Gateway (AG), Mobility Anchor (MA)

7 Distributed mobility management architecture Mobility Protocol MD (op=onal) MN M- DP Data plane tunnel M- DP CN (a) Par=ally- distributed MD Mobility Protocol MD MN M- DP Data plane tunnel M- DP CN (b) Fully- distributed

8 Distributed mobility management architecture The par=ally- distributed model could be seen quite reasonable But the control plane distribu=on in fully- distributed model, e.g. using peer- to- peer (P2P) approach is s=ll yet convinced in terms of reliable opera=on support MD Mobility Protocol MD MN M- DP Data plane tunnel M- DP CN (b) Fully- distributed

9 Distributed mobility management architecture A large volume of control signaling for managing distributed mobility database Could be hard to enforce network policies S=ll remains low flexibility and vulnerability for effec=ve network opera=ons MD Mobility Protocol MD MN M- DP Data plane tunnel M- DP CN (b) Fully- distributed

10 SoFware- Defined Networking (SDN) The control and data planes are decoupled Network intelligence and state are logically centralized App #1 App #2 App #3 App #4 App #5 SDN Controller SDN- compliant switch SDN- compliant switch SDN- compliant switch

11 SoFware- Defined Networking (SDN) The underlying network infrastructure is abstracted from the applica=ons, thus greatly simplifying network design and opera=ons App #1 App #2 App #3 App #4 App #5 SDN Controller SDN- compliant switch SDN- compliant switch SDN- compliant switch

12 SDN- based mobile network architecture Fully- separated control plane: a new paradigm on progressing MD CE SDN Protocol MN FE Data plane tunnel FE CN

13 SDN- based mobile network architecture Lack of features for enhanced mobility support and network scalability MD CE SDN Protocol MN FE Data plane tunnel FE CN

14 Proposed architecture model #1 Par=ally- separated model with a single controller structure Mobility Protocol MD CE SDN Protocol MN FE FE Data plane tunnel (a) Par=ally- separated with single control model CN

15 Proposed architecture model #1 Mobility detec=on and binding management are enabled by the legacy mobility protocol A SDN protocol is used to monitor current mobility support resources from the deployed FEs and to deliver command to the FEs involved in packet forwarding of the flow.

16 Proposed architecture model #1 Pros. Reusability of the legacy features made and matured for a long =me Improved and fast link recovery Highly complementary to fill gaps from legacy control plane and SDN- based control plane

17 Proposed architecture model #1 Cons. Implementa=on of the controller may be complex than the other op=ons Interface between and CE required Heterogeneous signaling should be quickly interpreted, being able to act on proper FEs

18 Proposed architecture model #2 Par=ally- separated model with hierarchical controller structure L- MD G- MD L- MD L- CE G- CE L- CE Mobility Protocol SDN Protocol MN FE FE Data plane tunnel (b) Par=ally- separated with hierarchical control model CN

19 Proposed architecture model #2 Mobility domain could be localized and isolated for enabling fast event collec=on and enforcing commands into FEs L- MD G- MD L- MD L- CE G- CE L- CE Mobility Protocol SDN Protocol MN FE FE Data plane tunnel (b) Par=ally- separated with hierarchical control model CN

20 Proposed architecture model #2 Pros. Scalability is enhanced with inherited features of par=ally- separated model High- processing- required sub- controllers can leverage cloud resources deployed at data centers,

21 Proposed architecture model #2 Cons. Implementa=on may be complex since sub- controllers are connected with three different en==es (FE, L- CE, G- CE)

22 Applicability based on #1 PMIPv6 LMA (CE) CN LMA (CE) CN FE MAG (FE) MAG (FE) MAG (FE) MAG (FE) (a) MN MN (b)

23 Applicability based on #1 Flexible mobility anchor selec=on could be made, based on flow type and mobility speed Improved forwarding technique could be added for Seamless handover, e.g. bi- cas=ng in a predic=ve handover case

24 Applicability based on #1 3GPP Evolved Packet Core (EPC) CN2 CN2 MME MME (CE) CN1 SGW / PGW CN1 SGW / PGW (FE) L- PGW L- SGW L- PGW (FE) L- SGW (FE) MN MN (a) Gateway selec=on in 3GPP EPC standards (b) Enhanced gateway selec=on over the proposed SDN- based 3GPP EPC architecture

25 Applicability based on #1 Where mul=ple PDN connec=on are required: one is anchor at a centrally located PGW while the other is a local PGW for SIPTO traffic Intelligent mobility anchor selec=on could be made, since the controller has a holis=c view of the network

26 Applicability based on #2 Mobility support between localized mobility domains (PMIPv6 case) CN MN MAG (FE) Domain 1 MAG (FE) Flow Table Update LMA (L- CE) Flow Table PBA Update MAG (FE) G- CE PBU (Dereg) Flow Table Update Flow Table Update Do you know this node MN? LMA (L- CE) PBA MAG (FE) PBU Domain 2 MAG (FE) movement MN

27 Performance Handover Latency Propor=onal to the =me spent to detect the changed loca=on of an MN and update the flow table entries of the FEs pertaining to the MN's handover Resulted from chosen mobility management protocol and instan=ated SDN controllers for each

28 Performance Reliability Easy to take immediate ac=ons against unexpected network events such as a link failure or a binding failure Reliability and flexibility added

29 Performance CompaQbility It can basically accommodate loca=on management and tracking/paging func=ons currently implemented in the operator domain More specific compa=bility aspects depend on an integra=on design goal

30 ImplementaQon Challenges Handover Support Detec=on of agachment and detachment of the MNs during the handover Added API and rule ac=ons required Import the external management mechanism such as Media- Independent Handover (MIH) with SDN could be an op=on

31 ImplementaQon Challenges Data Path Management How tunneling capability could be provided? VLAN tags and MPLS labels in the OpenFlow But addi=onal rules and ac=ons defini=on required for the matching of IP or GTP tunneling Currently, using Iptables rules, iproute,

32 ImplementaQon Challenges Hierarchy of Controllers It can be conjectured that the L- CE can be an OpenFlow controller while the G- CE should be a network applica=on The no=on of query and answer models should be embedded between the controllers for retrieving mobility- related informa=on

33 Conclusion Par=ally- separated SDN mobile architectures presented Being able to reuse legacy mobility control plane for loca=on management and enhanced mobility management capabili=es The architectures were dis=nc=vely given with the considera=ons of different controller models: single and hierarchical controller

34 Conclusion Expected applicability scenarios and examples given, focused on flexibility and reliability in providing the mobility management opera=on Performance ad implementa=on challenges discussed

35 End of PresentaQon Thanks for your agen=on

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