5G NR RedCap关键技术研究

doi:10.11959/j.issn.1000-0801.2022044

Abstract

Abstract:

Faced to industrial wireless sensors, video surveillance, wearable devices, RedCap UE (reduced-capability user equipment) was proposed in 3GPP Release 17 (Rel-17), which could greatly reduce the costs of UE under the premise of satisfying the requirements of these use cases.Firstly, the standardization progress of 5G RedCap was introduced.Then, typical use cases of 5G RedCap technology were analyzed.After that, deep research was carried on the complexity reduction characteristics as well as the related gains brought by RedCap technology from two aspects of UE optimization and network performance improvement.Finally, the development potential and the evolution direction in the future were summarized.

Key words: 5G, RedCap, low complexity, low power consumption, multiple BWP, LTE Cat4

CLC Number:

TN929.5

Hanyang LI, Weiwen WENG, Nan LI, Long ZHANG, Jinxia CHENG. Research of 5G NR RedCap technology[J]. Telecommunications Science, 2022, 38(3): 93-101.

Figures/Tables 9

References 26

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指标	NR RedCap	LTE Cat 4
带宽/MHz	FR1：20	20
	FR2：100
收发天线	1T1R、1T2R	1T2R
调制	64QAM必选	64QAM
	256QAM可选
速率/(Mbit·s^-1)	FR1（FDD/1T2R，64QAM）：上行85、下行170	FDD（64QAM）：上行75、下行150
商用时间点	2022年第二季度标准冻结，商用最早在2023年	已成熟商用
应用场景	工业无线传感器、视频监控、可穿戴	车辆追踪、高端POS、可穿戴、视频监控、工业传感器等

功能特性	技术原理
RedCap UE基本接入	20 MHz带宽RedCap新UE类型接入5G网络，基本功能可用
RedCap UE和eMBB UE高效共存	初始接入期间，RedCap UE的初始下行BWP带宽不超过RedCap UE的最大带宽，为RedCap UE单独配置专属的窄带初始下行BWP和初始上行BWP
网络侧多BWP	针对分层BWP部署以充分利用大带宽，保障RedCap UE能充分使用5G大带宽网络容量
辅助上行（supplementary uplink， SUL）	关注RedCap的1T SUL功能
高层UE能力识别与参数配置	定义RedCap UE类型及其能力上报
RedCap UE早期识别	为RedCap UE引入单独的access bar功能，使得RedCap UE可以在随机接入过程中上报UE类型
覆盖增强	RedCap UE可复用NR覆盖增强中的方案
节电增强	RedCap UE可复用Rel-17中UE节电增强的方案，包括减少PDCCH监控、增加RRC空闲态或非激活态UE的eDRX周期等
低功耗	关注eDRX、连接态唤醒业务（wake up service，WUS）、小数据业务等
切片	关注网络侧RedCap BWP和切片资源兼容管理
低时延	关注URLLC主要价值特性，包括Grant free、Slot聚合、NonSlot等
低功耗/高精度定位	关注增强型小区标识（enhanced cell-ID，ECID）技术、到达时间差（observed time difference of arrival，UTDOA）定位技术、Rel-17 低功耗高精度定位（low power high accuracy position， LPHAP）技术

Research of 5G NR RedCap technology

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