MPLS in Mobile Backhaul Networks Framework and Requirements ...
MPLS in Mobile Backhaul Networks Framework and Requirements ...
MPLS in Mobile Backhaul Networks Framework and Requirements ...
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<strong>MPLS</strong> <strong>in</strong> <strong>Mobile</strong> <strong>Backhaul</strong> <strong>Networks</strong> <strong>Framework</strong> <strong>and</strong> <strong>Requirements</strong> Technical Specification IP/<strong>MPLS</strong> Forum 20.0.0<br />
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<strong>in</strong>terface between BS <strong>and</strong> aGW on one h<strong>and</strong> <strong>and</strong> over the <strong>in</strong>terface between BSs on the other h<strong>and</strong>. It is<br />
important to note that the same L3VPN <strong>MPLS</strong> transport solution [RFC4364] has to be used to backhaul<br />
both the BS-aGW <strong>in</strong>terface <strong>and</strong> the BS-BS <strong>in</strong>terface <strong>in</strong> order to have a homogeneous <strong>and</strong> efficient<br />
solution.<br />
The connectivity between the CSG <strong>and</strong> the L3VPN <strong>in</strong> the access network can be provided by a native<br />
layer 2 technology or emulated us<strong>in</strong>g e.g., VPWS or VPLS.<br />
BS1<br />
BS2<br />
BS3<br />
S1/R6<br />
IP TNL<br />
S1/R6<br />
IP TNL<br />
S1/R6<br />
IP TNL<br />
Access Aggregation<br />
CSG1<br />
CSG2<br />
CSG3<br />
CSG1<br />
CSG2<br />
CSG3<br />
CSG1<br />
CSG2<br />
CSG3<br />
Cell SIte<br />
Gateway<br />
(CSG)<br />
CSG1<br />
CSG2<br />
CSG3<br />
Access<br />
network<br />
Access<br />
Node<br />
Edge<br />
Node<br />
Edge<br />
Node<br />
Aggregation<br />
network<br />
Edge<br />
Node<br />
<strong>Mobile</strong><br />
Aggregation<br />
Site Gateway<br />
(MASG)<br />
L3VPN <strong>MPLS</strong> transport network solutions<br />
IP<br />
Access<br />
network<br />
IP<br />
L3VPN<br />
L3VPN<br />
L3VPN<br />
IP TNL<br />
S1/R6<br />
L3VPN<br />
<strong>MPLS</strong><br />
aGW<br />
aGW<br />
S5/S8a<br />
Core<br />
IP/<strong>MPLS</strong><br />
Core<br />
network<br />
Note: BS supports Ethernet<br />
<strong>in</strong>terface.<br />
One Cell Site Gateway can<br />
connect multiple BS.<br />
October 2008 Page 28<br />
R3<br />
VRF<br />
S3/S4<br />
R3<br />
SGSN<br />
S5/S8a PDN GW<br />
S6a<br />
HA<br />
HSS<br />
<strong>MPLS</strong> PE function could be<br />
<strong>in</strong>tegrated <strong>in</strong>to the aGW<br />
(MME GW, S-GW, ASN GW)<br />
Figure 13: Reference Architecture for Flat <strong>Mobile</strong> <strong>Networks</strong> with L3VPN <strong>MPLS</strong> Transport <strong>in</strong> the<br />
Access (optional)/Aggregation/Core networks.<br />
6.3 IP TNL Scenario<br />
As mentioned before, only the IP TNL is used <strong>in</strong> flat mobile networks (e.g., LTE, HSPA+ flat, mobile<br />
WiMAX, UMB) on the mobile <strong>in</strong>terfaces between BS <strong>and</strong> aGW, <strong>and</strong> on the mobile <strong>in</strong>terfaces between<br />
BSs for control plane <strong>and</strong> user plane (e.g. S1/X2 for LTE, R6/R8/R2 for WiMAX).<br />
This scenario covers RAN equipment communicat<strong>in</strong>g by means of IP packets. The <strong>MPLS</strong> PE function<br />
may transport the IP traffic us<strong>in</strong>g IPoEtho<strong>MPLS</strong> us<strong>in</strong>g e.g., L2VPNs or IPo<strong>MPLS</strong> us<strong>in</strong>g e.g., L3VPNs as<br />
a transport solution. Note that there is no explicit Ethernet TNL def<strong>in</strong>ed. It is envisioned that the IP TNL<br />
uses Ethernet as its underly<strong>in</strong>g layer 2 just as it could use other layer 2 protocols.
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