Inter-CU LTM in DC包括Inter-CU SCG LTM及Inter-CU MCG LTM的相關議題。   Inter-CU SCG LTM： 關於inter-CU SCG LTM的configuration, 因為要配置給UE的candidate SNs需經過與MN的association, 也就是要讓MN對candidate SNs送出SN addition request, 並收到candidate SNs回覆的SN addition reques

2024年八月召開的3GPP RAN2#127標準會議討論了inter-CU LTM要採用single還是multiple的reference configuration(s): LG認為不同CU configure的candidate cell configurations的commonality是很小的, 因此主張應採用Multiple reference configurations, 讓CU有各自的reference configuration; Apple則主張不引入addi

不同於intra-CU LTM cell switch，inter-CU LTM cell switch的source CU跟candidate CU可能不同（serving node可能會換），因此3GPP標準會議有以下針對intra-CU LTM的議題討論與決議：   Discussion Issue 1: Xn-based or N2-based inter-CU LTM 第一個議題在討論要採用Xn-based interface或N2-based interf

Background For SN initiated inter-SN SCG selective activation: RAN2#121bis agreement: For SN initiated inter-SN SCG selective activation, source SN generates the execution conditions for the initial CPC. RAN2#122 agreement: For SN-initiated SCG

Discussion Issue 1: Execution condition generation for initial CPAC and subsequent CPC Previous agreements: RAN2 #119 agreement: The selective activation of cell groups should correspond to support of subsequent conditional changes (CPC) af

Background   Objective from WID (RP-221799): To allow subsequent cell group change after changing CG without reconfiguration and re-initiation of CPC/CPA [RAN2, RAN3, RAN4]. RAN2 #119 agreement: The selective activation of cell g

我們知道Handover的需求往往起因於UE與serving (source) cell間的無線鏈路信號品質下降，不同於傳統的Normal Handover (NHO)，Conditional Handover (CHO)透過由source cell提早發送換手配置給UE，來避免因UE與source cell間的無線鏈路信號品質已下降而無法成功傳達換手配置訊息，以提高換手程序的可靠度。既然是「提早」發送配置，那就意謂著UE收到CHO的換手配置時，不需「立即」執行，而是根據伴隨CHO的換手配置一

Rel-17 NR CPAC is specified in 3GPP TS 38.331 Section 5.3.5.13 Conditional Reconfiguration including the following sub-sections: 5.3.5.13.1  General  5.3.5.13.2  Conditional reconfiguration removal  5.3.5.13.3  Con

Rel-17 NR CPAC (Conditional PSCell Change/Addition) includes: Conditional NR PSCell addition (CPA) MN initiated inter-SN conditional NR PSCell change (CPC) SN initiated inter-SN conditional NR PSCell change (CPC) Rel-17 NR CPAC is spe

Scope: Inter-node messages in SN-initiated inter-SN CPC preparation: Inter-node messages in MN-initiated inter-SN CPC and CPA preparation:   Previous related agreements made in 3GPP : In order to exchange per-PSCell parameter b