As defined by 3GPP, LTE Layer 2 structure consists of PDCP/RLC/MAC layers . Transport channels are located between the physical layer and MAC layer. MAC multiplexes RLC links and manages scheduling and priority handling via logical channels. The diagrams below show the structure for the downlink and uplink of Layer 2.
Read moreWhat is MAC PDU in LTE?
LTE MAC PDU is a bit string but octet aligned (i.e multiple of 8 bits) . A MAC PDU header consists of one or more subheaders. Each subheader corresponds to either a MAC SDU, MAC control element or padding. MAC PDU header can have these six elements R/R/E/LCID/F/L.
Read moreWhat media access control methods does the 5G cellular use?
A: 5G is based on OFDM (Orthogonal frequency-division multiplexing) , a method of modulating a digital signal across several different channels to reduce interference. 5G uses 5G NR air interface alongside OFDM principles. 5G also uses wider bandwidth technologies such as sub-6 GHz and mmWave.
Read moreWhat protocol is 5G?
Data then goes through the service data adaptation protocol (SDAP) , a new protocol layer for quality of service (QoS) management. The higher protocol layers are based on LTE. The IP header is replaced with a 5G equivalent at the packet data convergence protocol (PDCP) layer.23 Tem 2020
Read moreWhat is layer mapping?
(2) Layer Mapping : This is the process where each codeword is mapped to mapped to one or multiple layers . Refer to Layer Mapping page. (3) Precoding : This is process where the layer data are allocated to multiple antenna ports (logical antenna ports in this stage).
Read moreWhat are layers in MIMO?
Single-user MIMO (SU-MIMO) is the ability to transmit one or multiple data streams , called layers, from one transmitting array to a single user. SU-MIMO can thereby increase the throughput for that user and increase the capacity of the network.
Read moreWhat is Layer 3 in 5G?
5G-NR Layer 3 (RRC) Functions: Establishment, maintenance, and release of an RRC connection between the UE and NG-RAN including Addition, modification, and release of carrier aggregation, Addition, modification, and release of Dual Connectivity in NR or between E-UTRA and NR.
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