LTE Access Network:
Two transport medium are used in LTE.
1). Fiber Access
2). Microwave technology
LTE Synchronization:
In 2G/3G methods to synchronize the base stations clock reference provision by BSC/RNC over T1/E1 connections or external source such as GPS.
In LTE Timing-over-Packet is a solution based on IEEE 1588v2 Precision Time Protocol (PTP)
Synchronization over Packet Network via Ethernet Interface, eliminates the need for TDM link or GPS.
eNodeB Functional Planes:
The interfaces of eNB are referred as functional planes, all are based on IP:
User plane (U): this functional plane is used to transfer user data between eNB and S-GW. For each UE a GTP-U tunnel is build between eNB and S-GW.
Control Plane (C): SCTP is the protocol used to carry control plane protocols, S1-AP between eNB and MME and X2-AP between adjacent eNBs.
Management Plane (M): the O&M traffic to administer the Flexi BTS
Synchronization Plane (S): PTP protocol is used to provide synchronization from grandmaster to base station
The eNB can be configured with separate IP addresses for User, Control, Management and Synchronization Plane applications.
All applications can share the same IP address, the eNB features a single IP address.
In real world the preferred deployment is to separate management plane form other planes using L2 VLAN traffic separation.
Two transport medium are used in LTE.
1). Fiber Access
2). Microwave technology
LTE Synchronization:
In 2G/3G methods to synchronize the base stations clock reference provision by BSC/RNC over T1/E1 connections or external source such as GPS.
In LTE Timing-over-Packet is a solution based on IEEE 1588v2 Precision Time Protocol (PTP)
Synchronization over Packet Network via Ethernet Interface, eliminates the need for TDM link or GPS.
eNodeB Functional Planes:
The interfaces of eNB are referred as functional planes, all are based on IP:
User plane (U): this functional plane is used to transfer user data between eNB and S-GW. For each UE a GTP-U tunnel is build between eNB and S-GW.
Control Plane (C): SCTP is the protocol used to carry control plane protocols, S1-AP between eNB and MME and X2-AP between adjacent eNBs.
Management Plane (M): the O&M traffic to administer the Flexi BTS
Synchronization Plane (S): PTP protocol is used to provide synchronization from grandmaster to base station
The eNB can be configured with separate IP addresses for User, Control, Management and Synchronization Plane applications.
All applications can share the same IP address, the eNB features a single IP address.
In real world the preferred deployment is to separate management plane form other planes using L2 VLAN traffic separation.
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