Abstract
The fifth-generation (5G) wireless technology is primarily designed to address a wide range of use cases categorized into the enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine-type communication (mMTC). Nevertheless, there are a few other use cases that are in-between these main use cases such as industrial wireless sensor networks, video surveillance, or wearables. In order to efficiently serve such use cases, in Release 17, the 3rd generation partnership project (3GPP) introduced the reduced capability NR devices (NR-RedCap) with lower cost and complexity, smaller form factor, and longer battery life compared to regular NR devices. However, one key potential consequence of device cost and complexity reduction is coverage loss. In this paper, we provide a comprehensive evaluation of NR RedCap coverage for different physical channels and initial access messages to identify the channels/messages that are potentially coverage limiting for RedCap UEs. We perform the coverage evaluations for RedCap UEs operating in three different scenarios, namely Rural, Urban and Indoor with carrier frequencies 0.7 GHz, 2.6 GHz and 28 GHz, respectively. Our results confirm that for all the considered scenarios, the amounts of required coverage recovery for RedCap channels are either less than 1 dB or can be compensated by considering smaller data rate targets for RedCap use cases.
Highlights
The fifth-generation (5G) wireless technology enables a wide range of services with different requirements in terms of data rates, latency, reliability, coverage, energy efficiency, and connection density
There are still several other use cases whose requirements are higher than low-power wide-area network (LPWAN) (i.e., LTEM/narrowband Internet-ofThings (NB-IoT)) but lower than ultra-reliable and low-latency communication (URLLC) and enhanced mobile broadband (eMBB) [6]
Our aim in this paper is to investigate the impact of the complexity reduction on the coverage performance of RedCap user equipment (UE), identify the corresponding coverage-limiting channels, and evaluate the amount of coverage recovery needed for those channels
Summary
The fifth-generation (5G) wireless technology enables a wide range of services with different requirements in terms of data rates, latency, reliability, coverage, energy efficiency, and connection density. In order to meet the above generic requirements, and the one on device complexity and device size, the following features have been considered in the RedCap study item [6]: a) Reduced number of UE receiver (Rx) and/or transmitter (Tx) branches, VOLUME XX, XXXX
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