From the course: 4G LTE: Architecture, Protocols, Call Flows, KPIs, Optimization, Performance Analysis

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LTE resource grid: Time-frequency mapping

LTE resource grid: Time-frequency mapping

From the course: 4G LTE: Architecture, Protocols, Call Flows, KPIs, Optimization, Performance Analysis

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LTE resource grid: Time-frequency mapping

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Let's visualize the allocation of resources in time and frequency domain with an example here. So, the resource block is the basic unit of frequency allocation. It always consists of 12 consecutive subcarriers in the frequency domain. For example, at 15 kHz subcarrier spacing, one resource block occupies 180 kHz. And we have a time domain where we have a 10 millisecond, where we have one complete radio frame. So one radio frame here in this case, if we are just converting into a slot of 0.5 millisecond, in that case, we have certain OFDM symbols in time domain, 0 to 6, so total 7 OFDM symbols in 0.5 millisecond, total 14 OFDM symbols in 1 millisecond. On the frequency side, if you see, we have certain kind of subcarriers, which is ranging from 1 to 12 in this case and now we have total small boxes here if you see these are the resource elements. Now within a 1 millisecond if you see we have around 12 subcarriers into 14 OFDM symbols which is 168 resource elements per slot here of 1…

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