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2.9.1 LTE protocol Stack
The LTE Protocol Stack is composed of LTE protocols defined in 3GPP Release 10.
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PDCP (Packet Data Convergence Protocol)
Delivery and handling of user / control data including header compression and ciphering (defined in TS
36.323)
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RLC (Radio Link Control)
Data delivery between MAC and PDCP including segmentation and ARQ (defined in TS 36.322)
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MAC (Media Access Control)
Protocol mapping between transport channels and logical channels (defined in TS 36.321)
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RRC (Radio Resource Control)
Protocol to handle control plane signaling (defined in TS 36.331)
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S1AP (S1 Application Protocol)
Signaling protocol between HeNB and EPC (defined in TS 36.413)
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X2AP (X2 Application Protocol)
Signaling protocol between HeNBs to handle UE mobility (defined in TS 36.423)
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GTP (GPRS Tunneling Protocol)
Tunneling protocol for user plane (defined in TS 29.281)
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SCTP (Stream Control Transmission Protocol)
Transport protocol for S1 and X2 control interfaces (defined in TS 36.412)
The LTE Protocol Stack also includes blocks to support following higher layer functions.
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RRM (Radio Resource Management)
Management and control of radio resources including admission control and packet scheduling
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Mobility
Handling of mobility between cells with same or different frequencies through S1 and X2 links
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QoS (Quality of Service)
Provides QoS functions according to bearer types and associated parameters
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SON (Self Organizing Network)
Provides automatic configuration and parameter optimizations
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REM (Radio Environment Monitoring)
Measurement to identify surrounding cells for SON and ANR
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