Load-based testing (LBT) In LBT, the controls that are integral to the equipment are allowed to operate as they were designed by the equipment manufacturers. This dynamic testing approach involves emulating a building’s sensible and latent loads by adjusting temperature and humidity setpoints of the psychrometric chamber reconditioning system.

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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 …

Consistent LBT failure is detected per UL BWP by counting LBT failure indications, for all UL transmissions, from the lower layers to the MAC entity. RRC configures the following parameters in the lbt-FailureRecoveryConfig :

a method for LBT failure detection performed by a UE includes: receiving, by a MAC entity of the UE, an LBT failure indication from a lower layer for all UL transmissions; increasing an LBT...

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ul 失步时，在rrc_connected期间ul数据到达（cbra） UL data arrival during RRC_CONNECTED when there are no PUCCH resources for SR available; RRC_CONNECTED态下，UL数据到达时，UE没有可用的PUCCH资源用于SR传输(此时允许上行同步的UE使用RACH来替代SR) 基 …

由LTE-U Forum提交的LTE-U（LTE Unlicensed）方案在3GPP R12版本中体现，在3GPP R13 规范中已批准了LBT 的 LAA （Licensed Assisted Access，授权辅助接入）和网络间互操作的LWA（LTE-WLAN Aggregation，LTE-WLAN聚合）。 美国高通公司主导的Mutefire技术，可以不依赖授权频段锚点、独立部署在非授权频段。 2020年7月冻结的3GPP R16 标准已支持NR-U（NR Unlicensed，基于NR 的非授权频段接入）技术，使用NR 协议在非授权频段提供接入服务， …

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The Product Category, also known as the UL Category Description, describes the product classification under which an item or product is listed. A code UL has assigned to identify and track this listing. Model numbers included in the listing. Multiple model numbers may indicate different products, different components within the products or both.