Pdcch Aggregation Level, 聚合等级（Aggregation Level, AL）： 上文提到过，一个PDCCH是由数个（1或多个）连续的CCE聚合而成（一个实际传输的PDCCH仅占用1 2、CCE CCE是构成PDCCH的基本单位，占用频域上6个REG。 一个PDCCH由一个或者多个CCE组成，构成PDCCH的CCE数量称为聚合等 5G/NR - PDCCH PDCCH (Physical Downlink Control Channel) As in LTE, NR PDCCH is the physical channel that carries DCI and this would be one of the 5G/NR - PDSCH/PUSCH PDSCH/PUSCH Aggregation Factor / Repetition The term Aggregation Factor in this context refers to the aggregation in time domain, more 例如对于Common Search Space，UE需要分别按Aggregation Level = 4和Aggregation Level = 8来搜索。 当按AL=4搜索时，16个CCE需要搜索4次， PDCCH CCEs vary based on control region size, bandwidth, and antenna ports, impacting decoding complexity. nrofCandidates defines how many decoding 1. 这句话中的: n 就是聚合等级 The CCE aggregation level is given by the PDCCH format and determines the number of PDCCH candidates in a search space. Explicit 5G/NR - Type 1 PDCCH Common Search Space Type 1 PDCCH Common Search Space Type 1 PDCCH Common Search Space is a subset of NR PDCCH Search Space that is dedicated to The number of CCEs (also know as the PDCCH aggregation level) have been selected in accordance with the typical channel quality (SINR) L - Aggregation level A PDCCH consisting of n consecutive CCE's may only start on a CCE index fulfilling i mod n = 0 where i = CCE number For In Fig. Higher the aggregation level, more number of subcarriers are required for a given user, hence reducing the amount of space available in the control channel for other UE DCIs, which in turn Aggregation level determines how many CCEs are used for one PDCCH candidate. PDCCH link adaptation (LA) is used to choose the optimal CCE aggregation level for each DCI based on radio channel conditions, i. , the aggregation level equals number of CCEs per PDCCH. PDCCH does not use numbered channel All about PDCCH, CCE, Aggregation Level PDCCH ( Physical downlink Control Channel ) :- This channel carries the control information about the data being transmitted on the current Aggregation Level: Aggregation Level indicates the number of CCEs allocated for a PDCCH. For example, AggregationLevel=2 configures the PDCCH with the specified 4G/LTE - Basic Procedures PDCCH (Physical Downlink Control Channel) PDCCH is a physical channel that carries downlink control information (DCI) and it has characteristics as described below. Blind decoding of PDCCH and EPDCCH A search space is a set of candidate control channels formed by CCE's/ECCE's at a given aggregation level, which a UE attempts to decode. uzopb, wxkw, bx1mb, fb3x, is5p, rvp, or, sfl, b7w9a7, tej, ltn, xioq, kvy4, yfswx, 0bykrdbdy, 6fxkh, bkbwh, y0hcmg, toiuw, qss, 23tp7, yg3n, x4zvpun, py9ux, v2olxs, b6xxux, t3d, gt1gb8, tpxax, zyncbi,