Method and device for transmitting/receiving downlink control information in wireless communication system
摘要
說明書
For example, frequency resources constituting a PDCCH candidate of aggregation level=4 may be divided into control channel element (CCE) units. In addition, TCI state 1 is mapped to the 1st and 3rd CCEs, and TCI state 2 is mapped to the 2nd and 4th CCEs, so that the TCI state may be mapped alternately. Alternatively, TCI state 1 is mapped to the 1st and 2nd CCEs, and TCI state 2 is mapped to the 3rd and 4th CCEs, so that the CCEs of the previous half and the CCEs of the following half may be mapped to different TCI states. By generalizing this, similarly, for N TCI states, the N TCIs may be mapped one by one as the CCE index increases in a circular manner. Alternatively, all CCEs may be divided into N groups by adjacent CCEs (adjacent CCE indexes), and N CCE groups and N TCI states may be mapped 1:1.
In the case of a PDCCH candidate of aggregation level=1, since it cannot be divided into CCE units, a resource element group (REG: resource element group) bundle size is configured to less than 6 REG, and it may be divided in units of REG bundles. In addition, a TCI state may be mapped by dividing resources in units of REG bundles regardless of an aggregation level. Here, the mapping between TCI states and REG bundles may be equivalently applied to the mapping method between TCI states and CCEs. For example, if a PDCCH candidate with aggregation level=1 is composed of 3 REG bundles (with bundle size=2), TCI state 1 is mapped to the 1st and 3rd REG bundles, and TCI state 2 is mapped to the 2nd REG bundle, so that the TCI state may be mapped alternately. Alternatively, TCI state 1 is mapped to the 1st and 2nd REG bundles, and TCI state 1 is mapped to the 3rd REG bundle, the REG bundles of the previous half and the REG bundles of the following half may be mapped to different TCI states.
