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非授权频谱使用的LBT机制分为基于负载的LBE（Load-Based-Equipment）和基于帧的FBE（Frame-Based-Equipment）两种。 FBE机制是在确定没有Wi-Fi等其他RAT技术使用的场景，使用固定的总时长，可最大限度利用信道资源，可以考虑用于专网场景。

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LBT (listen before talk),顾名思义“先听后说”或者叫“先听后发”，是无线电通信中使用较为广泛的一种技术，无线电发射机在开始传输之前首先会侦听其无线电环境，检测信道是否空闲，若信道处于繁忙状态则等待信道空闲时再传输，避免信道访问冲突，实现信道频谱共享。 2. 怎么增加通信可靠性？ 2.1 LBT机制内容简介. （1）发送数据前首先检测信道是否有使用，如果检测出信道繁忙，则等待一段随机时间后，才发送数据。 （2）接收端如果正确收到此帧数据，则经过一段时间间 …

Two flavors of the listen before talk (LBT) principle, referred to as load based equipment (LBE) and frame based equipment (FBE), are recommended by 3GPP. In this paper, we investigate two enhanced FBE mechanisms, i.e., 1) enhanced FBE (E-FBE); and 2) backoff and idle time reduction FBE (BITR-FBE) for the purpose of improving FBE.

Fig. 9 shows the conceptual differences between LBE and FBE LBT as described in [112]. As shown in Fig. 9a, LBE LBT devices can contend for the channel as soon as the previous transmission...

2020年4月21日 · LBT机制又分为基于帧的FBE(Frame Based Equipment)和基于负载的LBE(Load Based Equipment)两种。 LBE机制是在同频没有其他接入技术共存条件下使用的机制，而FBE机制主要用于同频没有其他系统共存时使用的一种接入方式。

nr-u 标准化了 3 种基于 lbe 的 lbt 过程。在标准化过程中，3 种 lbt 过程分别被称为 cat1 lbt（lbt 等级 1）、cat2 lbt（lbt 等级 2）和 cat4 lbt（lbt 等级 4）。不同 lbt 等级对应不同国家和地区的 lbt 监管规则。在实际的 nr-u 发送中，根据监管规则，不同的物理信道发送也 ...

2017年7月24日 · The work of proposed two basic modes of LBT, i.e. frame-based equipment (FBE) in which BSs access channel periodically, and load-based equipment (LBE) in which BSs access channel on demand. The impact of LBT parameters on the coexistence performance of Wi-Fi and cellular networks was analysed in .

本文详细介绍了LTE-LAA中的LBT（Listen Before Talk）技术，包括LBT的分类（CAT1, CAT2, CAT4）及其应用场景，信道接入流程，多载波信道接入策略（Type-A, Type-B）以及基站和UE发起的COT（Channel Occupancy Time）的LBT优先级管理。