REFERENCE SIGNAL USE IN NETWORK LTE 5G-NR DL Channel State Information CRS, CSI-RS CSI-RS UL Channel State Information SRS SRS Data Channel Modulation CRS,DMRS DMRS Control Channel Demodulation CRS DMRS Phase tracking PTRS Time and Frequency Tracking CRS TRS Beam Management SSB,CSI-RS Radio Link Monitoring CRS CSI-RS,SSB RRM Measurement CRS CSI-RS,SSB
REFERENCE SIGNAL USE IN NETWORK LTE 5G-NR DL Channel State Information CRS, CSI-RS CSI-RS UL Channel State Information SRS SRS Data Channel Modulation CRS,DMRS DMRS Control Channel Demodulation CRS DMRS Phase tracking PTRS Time and Frequency Tracking CRS TRS Beam Management SSB,CSI-RS Radio Link Monitoring CRS CSI-RS,SSB RRM Measurement CRS CSI-RS,SSB
Radio Protocol Architecture The 5G NR radio access network is comprised of these protocol entities: Service data adaptation protocol (SDAP) Packet data convergence protocol (PDCP) Radio link control (RLC) Medium access control (MAC) Physical layer (PHY) To meet the desired key capabilities of 5G NR, the other layers of the stack provide various enhancements over…
Frame Structure 5G-NR In NR, similar to LTE, a radio frame is fixed to be 10 ms, which consists of 10 subframes each of 1ms. However, different from LTE which has a fixed subcarrier spacing (SCS) for 15 kHz, NR supports scalable numerology for more flexible deployments covering a wide range of services and carrier…
5GS Connection Management states Two CM states are used to reflect the NAS signaling Connection of the UE with the AMF: CM-IDLE CM-CONNECTED CM-IDLE state A UE in CM-IDLE state has no NAS signalling connection established with the AMF over N1. The UE performs cell selection/cell reselection according to TS 38.304 [50] and PLMN selection according to…
A UE/user needs to register with the network to receive services that requires registration. 5GS Registration Management states Two RM states are used in the UE and the AMF that reflect the registration status of the UE in the selected PLMN. RM-DEREGISTERED. RM-REGISTERED RM-DEREGISTERED state In the RM‑DEREGISTERED state, the UE is not registered with…
The 5G System architecture consists of the following network functions (NF). Service-based interfaces: This Service based interface is connected to each interface. The 5G System Architecture contains the following service-based interfaces: SBI Interface Namf Service-based interface exhibited by AMF Nsmf Service-based interface exhibited by SMF Nnef Service-based interface exhibited by NEF Npcf Service-based interface…
Master Information Block Direction: gnB=> UE Signalling Radio Bearer: N/A RLC-SAP: TM Logical Channel: BCCH Transport Channel: BCH The MASTER INFORMATION BLOCK (MIB) includes a limited number of most essential and most frequently transmitted parameters that are needed to acquire other information from the cell. The MIB is transmitted on BCH while all other SYSTEM INFORMATION messages are transmitted on DL-SCH The MIB is always transmitted on the BCH…
SCG Failure 5G NR RLF is declared separately for the MCG and for the SCG If radio link failure is detected for MCG, the UE initiates the RRC connection re-establishment procedure The following SCG failure cases are supported: SCG RLF SN change failure For EN-DC, NGEN-DC, and NR-DC, SCG configuration failure (only for messages on…
According to 3GPP specification, UE channel bandwidth is up to 100MHz for sub-6GHz bands and 400MHz for above 6GHz bands, which is much wider than the bandwidth of 20MHz in LTE. It should be noted that UE capability of supported bandwidth varies and is often limited to the bandwidth less than the maximum bandwidth supported…