LTE protocol Architecture is organized on the basis of User Plane(data plane) and Control Plane.
User Plane Protocol Architecture
User plane is design to support high throughput. Here in above diagram we can see UE's PDCP layer downward all layers are mapped with eNodeB layers. They are involve in packet transmission and their security over radio link. What each layer does we will see in layers in LTE description section. From eNodeB onward SGW and PGW from core network, involved in data transmission.
Between UE and eNodeB we have open air LTE-Uu interface.
Between eNodeB and SGW and SGW to PGW, GTP-U (GPRS Tunnelling Protocol- User) is used and UDP(Transport Layer) is used as underlying protocol.
Control Plane in LTE is introduced to manage Mobility and Session of users. These protocol are resposible for transmission of all kind of signal which is used in user's roaming, user service use(session establishment), session termination, user's authentication and user's tracking.
The upper most layer of UE LTE Stack is NAS layer. NAS is only communicate with MME NAS via eNodeB so eNodeB passes NAS information to MME without seeing into them as transparent buffer.
From RRC layers downward all layers are mapped with eNodeB layers. These layers are responsible for establishing, modification and releasing of radio interface between UE and eNodeB and maintaining the security over open air interface.
Interface between UE and eNodeB is LTE-Uu.
Between eNodeB and MME we have S1-MME interface which work on S1-AP application layer protocol.
User Plane Protocol Architecture
User plane is design to support high throughput. Here in above diagram we can see UE's PDCP layer downward all layers are mapped with eNodeB layers. They are involve in packet transmission and their security over radio link. What each layer does we will see in layers in LTE description section. From eNodeB onward SGW and PGW from core network, involved in data transmission.
Between UE and eNodeB we have open air LTE-Uu interface.
Between eNodeB and SGW and SGW to PGW, GTP-U (GPRS Tunnelling Protocol- User) is used and UDP(Transport Layer) is used as underlying protocol.
Control Plane Protocol Architecture
Control Plane in LTE is introduced to manage Mobility and Session of users. These protocol are resposible for transmission of all kind of signal which is used in user's roaming, user service use(session establishment), session termination, user's authentication and user's tracking.
The upper most layer of UE LTE Stack is NAS layer. NAS is only communicate with MME NAS via eNodeB so eNodeB passes NAS information to MME without seeing into them as transparent buffer.
From RRC layers downward all layers are mapped with eNodeB layers. These layers are responsible for establishing, modification and releasing of radio interface between UE and eNodeB and maintaining the security over open air interface.
Interface between UE and eNodeB is LTE-Uu.
Between eNodeB and MME we have S1-MME interface which work on S1-AP application layer protocol.
References :
- 3GPP 23.401 TS
- LTE--the UMTS long term evolution Book by Stefania Sesia
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