LTE IN DEPTH

LTE IN DEPTH

EUTRAN

UE Identifiers:

Radio Network Temporary Identifiers (RNTI) are used as UE identifiers within E-UTRAN and in signalling messages between UE and E-UTRAN.

C-RNTI: The C-RNTI provides a unique UE identification at the cell level identifying RRC Connection

RA-RNTI:The RA-RNTI is used during some transient states, the UE is temporarily identified with a random value for contention resolution purposes.

S-TMSI:The S-TMSI is a temporary UE identity in order to support the subscriber identity
confidentiality. This S-TMSI is allocated by MME

Logical->Transport->Physical Channel Relation in LTE:

Pysical Channel:

DL
– Physical Broadcast Channel (PBCH)
– Physical Control Format Indicator Channel (PCFICH)
– Physical Downlink Control Channel (PDCCH)
– Physical Hybrid ARQ Indicator Channel (PHICH)
– Physical Downlink Shared Channel (PDSCH)
– Physical Multicast Channel (PMCH)
• UL
– Physical Uplink Control Channel (PUCCH)
– Physical Uplink Shared Channel (PUSCH)
– Physical Random Access Channel (PRACH)

Transport Channel:

• DL
– Broadcast Channel (BCH)
– Downlink Shared Channel (DL-SCH)
– Paging Channel (PCH)
– Multicast Channel (MCH)
• UL
– Uplink Shared Channel (UL-SCH)
– Random Access Channel (RACH)

Logical Channel:

. Control Channels: Control-plane information
– Broadcast Control Channel (BCCH)
– Paging Control Channel (PCCH)
– Common Control Channel (CCCH)
– Multicast Control Channel (MCCH)
– Dedicated Control Channel (DCCH)

• Traffic Channels: User-plane information
– Dedicated Traffic Channel (DTCH)
– Multicast Traffic Channel (MTCH)

Layer 3 Functionality(RRC):

Layer2 Functionality(PDCP, RLC and MAC):

Layer 1 Functionality(Physical)

LTE Bearers: