2023年4月16日 · Downlink Data Delivery Status (DDDS) is the F1⁃U message sent by DU during the inter-DU-intra-CU handover phase to inform the gNB⁃CU about the highest PDCP PDU Sequence...

2023年3月24日 · DDDS (Downlink Data Delivery Status) is a signaling mechanism used in cellular networks to track the delivery status of data sent from the network to a mobile device. This mechanism is particularly important in the context of LTE (Long-Term Evolution) and 5G (fifth generation) networks, where a significant amount of

2021年6月29日 · DDDS stands for downlink data delivery status. The DDDS is basically an elementary procedure of NRUP protocol defined in 3gpp in 38.425 and 36.425 for 5G and 4G respectively. So, in my words, when we need to give the feedback of downlink user data i.e DUD, then from the receiving node we need to send send DDDS message.

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

If the UP function supports the Downlink data delivery status notification with UPF buffering, the UP function shall set the DDDS feature flag in the UP Function Features IE (see clause 8.2.25).

ETSI 3GPP TS 38.401 version 15.2.0 Release 15 5 ETSI TS 138 401 V15.2.0 (2018-07) Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal

在 5g 网络中，完整性保护是一项至关重要的安全功能，旨在确保传输数据的真实性和完整性。 这种保护在控制平面中尤其重要，其中关键信令数据在用户设备（UE - 用户设备）和网络之间交换。

2018年8月1日 · 该过程用于UE在同一gNB-DU内从一个小区移动到另一个小区的情况，或者用于在NR操作期间执行小区内切换的情况，当执行小区内切换时，gNB-CU向gNB-DU提供新的UL GTP TEID，并且gNB-DU向gNB-CU提供新的DL GTP TEID。 gNB-DU将继续向UE发送UL PDCP PDU。 具有先前UL GTP TEID的gNB-CU直到其重新建立RLC，并且在RLC重建之后使用新的UL GTP TEID。 gNB-CU将继续使用先前的DL GTP TEID向具有先前DL GTP TEID的gNB-DU发 …

在3GPP空口协议定义里， PDCP 层位于 SDAP / RRC 层和 RLC 层之间。 PDCP一方面通过RLC channel访问传输服务，另一方面向上层提供 DRB 和 SRB 服务。 PDCP data transfer可理解为 PDCP PDU 的收/发处理。 其中PDU的发送较为简单。 PDU的接收会复杂些。 在介绍PDU收/发前，先对若干概念做些说明。 二、概念介绍. SN：sequence number（整数类型，取值范围 [0, 2pdcp-sn-size-1]），PDU中有SN域，故可从PDU直接获得SN。 SN的初始值是0，随着PDU的 …

2022年5月26日 · Downlink Control Information (DCI) carries information from gNB-to-UE such as info DL/UL resource scheduling, power control, modulation and coding schemes to decode a message, HARQ related...