All numerologies align on symbol boundaries every 1 ms in NR carrier (regardless of subcarrier spacing and CP-overhead)įollowing illustration is my interpretation of what is described above (it is difficult to capture every espect in a single diagram, but I hope this can give you some big picture).įrame Structure Candidates - From early TDoc, Academic PapersĮven thoutgh there are many WhitePapers on 5G issued from many different organizations or companies now (as of Oct 2015), I haven't seen much document touching on Frame Structure of the 5G.No explicit DC subcarrier is reserved for both Downlink and Uplink.Slot Aggregation (data transmission scheduling to span one or multiple slots.

Subframe Duration is fixed to be 1 ms 60, the number of OFDM symbols / slot = 14.At least for single numerology case, candidates of the maximum numbers of subcarrier is 3300 or 6600 in Rel 15.One Numerology corresponds to one subcarrier spacing in frequency domain.All details for channel bandwidth up to 100 Mhz per NR Carrier are to be specified in Rel 15.Maximum channel bandwidth per NR carrier is 400 Mhz in Rel 15.Subframe Structure - Control Channel and Reference Signalįrame Structure Agreement - 3GPP RP 38.802, 38.804Īccording to TR 38.802 (Ref ) section 5.3 and TR 38.804 (Ref ) section 5.4.7, it is agreed as follows :.Factors determining Subframe Structure (Subcarrier Spacing, # of Subcarriers, # of Symbols etc).Overall Requirement for Frame Structure.Frame Structure Candidates - From early TDoc, Academic Papers.Frame Structure Agreement - 3GPP RP 38.802, 38.804.

TS 38.211 is released, I will create another page purely based on 3GPP specification. I will follow up various discussions about 5G frame structure from early academic discussion to recent 3GPP agreement in this single page so that you can follow through how the idea on frame structure has evolved. There has been long long discussions on frame structure both in academia and in 3GPP and now we have pretty clear agreements on what a NR(5G) radio frame would look like. However, if you are interested only in the finalĬonclusion on the 5G/NR Frame Structre, refer to 5G/NR Frame Structure Page. If you are interested in some historical aspects of the 5G Frame structure, it would be good to read through this page. Now (as of Sep 2017) 3GPP official specification (38.211) defines the Frame Structure. This page introduces several candiates for 5G Frame Structure before 3GPP finalize the specification. I keep this as a reference showing how a new technoligy is being developed and evolved. NOTE : This is from various documents before 5G specification is finalized.

5g spectral efficiency