An efficient beam sweeping scheme with backup paging occasions in NR-Unlicensed Spectrum

IF 4.4 2区 计算机科学 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE Computer Networks Pub Date : 2024-09-19 DOI:10.1016/j.comnet.2024.110811
Eshita Rastogi , Abhishek Roy , Ayush Rastogi , Jaehoon (Paul) Jeong , Navrati Saxena
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Abstract

With the increasing demand of user applications and the shortage of cellular spectrum, New Radio (NR) access to Unlicensed Spectrum (NR-U) is getting significant attention. Listen Before Talk (LBT) procedure is used to sense unlicensed channel availability prior to transmission. The transmissions are subjected to LBT procedure failure, which brings extra delay as they are postponed to the next available transmission opportunity. This excess delay also affects time-critical procedures, such as paging. The directional communication in NR requires beamforming, which further complicates paging procedure as additional paging message transmissions are needed to cover all the beams. In this work, we propose an NR-U paging mechanism (called FF_BP) consisting of Full and Fast Paging Cycles with Backup Paging Occasions (POs). Full Paging uses a normal NR-U paging cycle and broadcasts a paging message on all the beams. On the other hand, Fast Paging, which targets delay-sensitive mobile users, uses a shorter paging cycle and broadcasts a paging message on selected beams only. The Backup POs deal with LBT procedure failure impairments while paging broadcast on selective beams reduces paging resource usage. We analyze FF_BP using a discrete-time semi-Markov chain model and validate the model by extensive simulations. The simulation results show that FF_BP outperforms several baseline mechanisms in terms of average paging delay and paging resource usage.
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无授权 NR 频谱中具有备份寻呼功能的高效波束扫描方案
随着用户应用需求的不断增长和蜂窝频谱的短缺,新无线电(NR)接入非授权频谱(NR-U)正受到极大关注。先听后说(LBT)程序用于在传输前感知非授权信道的可用性。传输会因 LBT 程序失败而推迟到下一次可用的传输机会,从而带来额外的延迟。这种多余的延迟也会影响寻呼等时间关键程序。NR 中的定向通信需要波束成形,这使得寻呼程序更加复杂,因为需要额外的寻呼信息传输才能覆盖所有波束。在这项工作中,我们提出了一种 NR-U 寻呼机制(称为 FF_BP),该机制由带有备份寻呼事件 (PO) 的完整和快速寻呼循环组成。全寻呼使用正常的 NR-U 寻呼周期,并在所有波束上广播寻呼信息。另一方面,快速寻呼针对对延迟敏感的移动用户,使用较短的寻呼周期,只在选定波束上广播寻呼信息。后备 PO 可处理 LBT 程序故障损害,而在选定波束上进行寻呼广播则可减少寻呼资源的使用。我们使用离散时间半马尔可夫链模型分析了 FF_BP,并通过大量仿真验证了该模型。仿真结果表明,在平均寻呼延迟和寻呼资源使用方面,FF_BP 优于几种基准机制。
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来源期刊
Computer Networks
Computer Networks 工程技术-电信学
CiteScore
10.80
自引率
3.60%
发文量
434
审稿时长
8.6 months
期刊介绍: Computer Networks is an international, archival journal providing a publication vehicle for complete coverage of all topics of interest to those involved in the computer communications networking area. The audience includes researchers, managers and operators of networks as well as designers and implementors. The Editorial Board will consider any material for publication that is of interest to those groups.
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