Table 2 Functions of each protocol
From: Overview of enabling technologies for 3GPP LTE-advanced
Protocol | Functions |
|---|---|
NAS | · Connection and session management between UE and the core network |
|  | · Authentication |
|  | · Registration |
|  | · Bearer context activation/deactivation |
|  | · Location registration management |
RRC | · Broadcast system information related to Non-Access Stratum (NAS) and Access Stratum (AS) |
|  | · Establishment, maintenance, and release of RRC connection |
|  | · Security functions including key management |
|  | · Mobility functions |
|  | · QoS management functions |
|  | · UE measurement reporting and control of the reporting |
|  | · NAS direct message transfer between UE and NAS |
PDCP | · Header compression |
|  | · In-sequence delivery and retransmission of PDCP Session Data Units (SDU's) for acknowledge mode radio bearer at handover |
|  | · Duplicate detection |
RLC | · Error correction through Automatic Repeat Request (ARQ) |
|  | · Segmentation according to the size of transport block and re-segmen in case a retransmission is needed |
|  | · Concatenation of SDU's for the same radio bearer |
|  | · Protocol error detection and recovery |
|  | · In-sequence delivery |
MAC | · Multiplexing/demultiplexing of RLC PDU's |
|  | · Scheduling information reporting |
|  | · Error correction through HARQ |
|  | · Local channel prioritization |
|  | · Padding |
PHY | · Transmission of electric signals |
|  | · Modulation |
|  | · Line coding |
|  | · Synchronization |