Search Space Set Linkage for Multi-TRP PDCCH Repetition
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Solution Overview
Problem
In wireless communication systems, efficiently determining the field size of a transmission configuration indication in downlink control information for multiple transmission reception point physical downlink control channel repetition is challenging due to the complexity of linking search space sets and the need to avoid unnecessary blind decoding when CORESET associations change.
Innovation Solution
An apparatus and method that obtain information on the linkage between search space sets, determine their linked status, and based on presence information, calculate the field size of the transmission configuration indication in downlink control information, using a reference CORESET to maintain consistent associations and reduce blind decoding requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If search space sets are linked for multi-TRP PDCCH repetition, then reliability of control channel reception is improved, but device complexity increases due to need to determine TCI field size
Solution Approach 1:
The patent applies preliminary action by pre-configuring search space set linkage information and TCI field size rules before actual PDCCH reception. The apparatus pre-determines whether TCI fields are present in linked search space sets and stores this configuration, so that during operation, the device can directly use these pre-established parameters without performing complex real-time determinations, thus reducing operational complexity while maintaining reliability
Solution Approach 2:
The patent introduces an intermediary mechanism by using a reference search space set to mediate the determination of TCI field size. Instead of independently determining TCI presence in each linked search space set, the apparatus uses the reference set's TCI configuration as a mediator to establish consistent field sizes across all linked sets, simplifying the overall determination process while ensuring reliable reception across multiple TRPs
2Reliability
If blind decoding is performed for all search space sets, then downlink control information is reliably received, but processing time increases
Solution Approach 1:
The patent applies the extraction principle by removing unnecessary blind decoding operations. The apparatus extracts and utilizes the pre-configured linkage information between search space sets to identify which sets are linked for multi-TRP repetition. By recognizing these linkages, the device can extract the TCI field size from the reference search space set and apply it to all linked sets, thereby eliminating the need to perform independent blind decoding for TCI field size determination in each set, thus reducing processing time while maintaining reliable DCI reception
3Adaptability or versatility
If TCI field size varies across search space sets, then adaptability to different configurations is improved, but determination complexity increases
Solution Approach 1:
The patent applies universality by making the reference search space set's TCI field size configuration universally applicable to all linked search space sets. Instead of determining different field sizes for each set, the apparatus uses the reference set's TCI configuration as a universal template for all linked sets. This multi-functional approach allows the same field size determination logic to serve multiple search space sets simultaneously, maintaining configuration adaptability while significantly reducing determination complexity
Solution Approach 2:
The patent applies homogeneity by standardizing the TCI field size across all linked search space sets through the reference set mechanism. The apparatus ensures that all linked sets use the same TCI field size configuration, creating a homogeneous structure within the linked group. This homogenization simplifies the determination process while maintaining the necessary adaptability through the overall search space configuration, as the linkage relationships and reference set selection can still be customized
Data Source
AI summary
A method comprising obtaining information regarding a linkage of a first search space set and a second search space set, wherein the first search space set and the second search space set are associated with a multi transmission reception point physical downlink control channel repetition, determining, based on the obtained information, that the first search space set and the second search space set are linked search space sets, determining for the linked search space sets a presence information of a transmission configuration indication, and based on the presence information, determining a field size of the transmission configuration indication in a downlink control information for the multiple transmission reception point physical downlink control channel repetition.