5G Reference Network Architecture In recent meetings, 3GPP comes to an interim agreement for non-roaming 5G reference network architecture. The agreed reference network architecture is shown in figure 1 as per 3GPP TR 23.799. Network nodes and their functions: User Equipment (UE) Next Gen Node Basestation (gNB) Core Access and Mobility Management Function (AMF) – responsible for … Read more
Spectral Efficiency : 5G-NR and 4G-LTE What do you think of when you hear word “spectral efficiency?” The answer will come, it has to do with the amount of information that fits in a given channel bandwidth or one just say how efficiently can that piece of spectrum be used to transmit information. Before we … Read more
5G New Radio Throughput Calculation The DL and UL max data rate supported by the UE is calculated by band combinations and baseband processing combinations supported by the UE. For NR, the approximate data rate for a given number of aggregated carriers in a band or band combination is computed as follows. To get more … Read more
5G NR Radio Network Temporary Identifier (RNTI) RNTI stands for Radio Network Temporary Identifier. RNTIs are used to differentiate/identify a connected UE in the cell, a specific radio channel, a group of UEs in case of paging, a group of UEs for which power control is issued by the eNB, system information transmitted for all … Read more
5G NR Logical Channels, Transport Channels, and Physical Channels Mapping Logical Channel Definition: Medium Access Control (MAC) Layer of NR provides services to the Radio Link Control (RLC) Layer in the form of logical channels. A logical channel is defined by the type of information it carries and is generally differentiated as a control channel, used for transmission … Read more
5G NR-Master Information Block (NR-MIB) Over all structure of MIB and SIB in NR is almost similar to LTE and other legacy technologies. However there is a major difference related to the periodical transmission of SIBs. In LTE and other legacy technologies the SIBs are broadcasted priodically regardless of whether UE wants it or not. … Read more
NR-Secondary Synchronization Signal (SSS) NR-Secondary Synchronization Signal: 5G-NR Secondary Synchronization Signal (SSS) is Physical Layer specific signal and help UE to get subframe boundary. It is similar to PSS, as it is also an m-Sequence. NR-SSS has following characteristics NR-SSS a m-Sequence made up of 127 Values SSS is mapped to 127 active sub carriers around … Read more
NR-Primary Synchronization Signal (PSS) 5G-NR Primary Synchronization Signal (PSS) is Physical Layer specific signal and help UE to get Radio Frame Boundary. It is type of an m-Sequence which is a special type of LFSR (Linear Feedback Shift Register) sequence provides the longest non-repeating sequence. NR-PSS has following characteristics NR-PSS a m-Sequence made up of … Read more
5G-NR Cell:Physical Cell ID Like LTE, 5G NR also has synchronization signal and known as Primary Synchronization signal (PSS) and Secondary Synchronization signal (SSS). These signals are specific to NR physical layer and provides following information required by UE for downlink synchronization. PSS provides Radio Frame Boundary ( Position of 1st Symbol in a Radio frame) SSS … Read more
5G NR Reference Signals (DMRS, PTRS,SRS and CSI-RS) To increase protocol efficiency, and to keep transmissions contained within a slot or beam without having to depend on other slots and beams, NR introduces the following four main reference signals. Demodulation Reference Signal (DMRS) Phase Tracking Reference Signal (PTRS) Sounding Reference Signal (SRS) Channel State Information … Read more