Background –In Rel-15/16, the codebook is designed for coherent transmission within one TRP operation, e.g., •Type I Single-Panel Codebook •Type I Multi-Panel Codebook •Type II Codebook/Enhanced Type II Codebook •Typ

R17 Unified TCI Framework on Single TRP Operation 2022/Nov/5   R15以及R16的TCI state application都是個別channel/RS各自處理，優點是可依各自需求調整，但一些場景例如UE快速移動，各channel/RS都會頻繁需要針對large scale channel property作集體調整，如果這時還是使用legacy TCI framework，可能會付出大量TCI state upda

Background Achieving full-power is more important for cell-edge UEs Low-rank mostly Low-rank precoders where most performance gain is expected E.g. rank-1 for 2/4Tx, and rank-2/3 for 4Tx Issue Power limitation due to powe

UE Maximum Output Power Full Tx power means UE delivers total power of 23dBm for PC3 Assumption of UE Types (Table 6.2.1.0-1) UE maximum output power limits for UL MIMO for power class 3 (Table 6.2D.1.3-2) Ref: 38.101-2 V16.1.0 (201

SRS –UE sounding procedure for DL CSI acquisition   2019/6/27 Author: Li-chung Lo   gNB依據TDD mode 的channel reciprocity特性，可藉由上行SRS進而得知下行通道狀況。   然而考慮到UE的可同時上行傳輸的antenna port個數可能小於可同時下行傳輸的antenna port個數的狀況下，則需要實行antenna switc

這次介紹SRS在control signal的結構，幫助各位在閱讀規格書時能了解名詞之間的結構，進一步了解SRS相關的procedure以及名詞相對應的物理意義。     Configuration Structure   首先，SRS分為兩個層級，集合層級的SRS resource set以及個別層級的SRS resource。SRS resource是physical time/frequency resource用來傳送SRS，而 SRS reso

繼上次跟各位介紹UL transmission scheme中的codebook based UL transmission之後，這次介紹建立在channel reciprocity特性下的Non-codebook based UL transmission。Non-codebook based UL transmission顧名思義就是 UE 不再依據已有的codebook進行PUSCH傳輸，而是依據associated CSI-RS或是Spatial QCL assumption自行調整P

跟各位介紹UL transmission scheme，UL transmission scheme目前有兩種傳輸模式分為跟LTE結構相似的codebook based UL transmission以及建立在channel reciprocity 特性的Non-codebook based UL transmission。這次先聊聊codebook based UL transmission運作與細節，下次再講解較為複雜的Non-codebook based UL transmission。