Non-Interleaved CORESET Cyclic Shifting for NR-Light PDCCH Decoding
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently supporting UEs with reduced capabilities, such as NR-Light UEs, due to their limited bandwidth and computational resources, which hinder effective decoding of interleaved control resource sets (CORESETs).
Innovation Solution
Implementing repetition specific cyclic shifting of non-interleaved CORESETs to enhance channel estimation and spatial diversity, allowing UEs with reduced capabilities to decode PDCCH candidates effectively by configuring cyclic shifts for multiple repetitions of the CORESET.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interleaved CORESET is used to provide frequency diversity, then reliability is improved, but device complexity increases making it difficult for UEs with reduced capabilities to decode
Solution Approach 1:
The CORESET is segmented into multiple non-interleaved repetitions, each occupying a distinct frequency resource. This segmentation allows UEs with reduced capabilities to decode individual repetitions without the complexity of interleaved structures, while still achieving frequency diversity through the distributed repetitions across different frequency resources.
Solution Approach 2:
The patent transitions from interleaving in the frequency domain to repetition across time and frequency dimensions. By distributing CORESET repetitions across multiple slots and frequency resources, the system achieves diversity without requiring complex interleaved structures, making it accessible to UEs with reduced capabilities.
2Ease of operation
If non-interleaved CORESET is used to reduce decoding complexity, then ease of operation is improved, but spatial diversity is reduced
Solution Approach 1:
The CORESET is transmitted periodically across multiple slots with cyclic shift configurations applied to each repetition. This periodic transmission with varying cyclic shifts provides spatial diversity over time while maintaining the simple non-interleaved structure that UEs with reduced capabilities can decode easily.
Solution Approach 2:
Different cyclic shift configurations are applied to different repetitions of the non-interleaved CORESET. By changing the cyclic shift parameter across repetitions, the system introduces spatial diversity without altering the fundamental non-interleaved structure, maintaining ease of operation while improving reliability.
3Reliability
If multiple repetitions of CORESET are transmitted to enhance reliability, then reliability is improved, but loss of time increases
Solution Approach 1:
The UE determines cyclic shift configurations for multiple repetitions in advance, before actual decoding is required. This preliminary determination allows the UE to efficiently process multiple repetitions without incurring additional decoding time, as the cyclic shift patterns are pre-established through RRC signaling or predefined rules.
Solution Approach 2:
The same CORESET content is copied across multiple repetitions with different cyclic shift configurations. This copying approach allows the UE to efficiently decode repetitions by applying known cyclic shift patterns, reducing the time required to process multiple transmissions while maintaining reliability through diversity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine a cyclic shift configuration for one or more repetitions of a non-interleaved control resource set (CORESET), and monitor for one or more physical downlink control channel candidates in the one or more repetitions of the non-interleaved CORESET based at least in part on determining the cyclic shift configuration for the one or more repetitions. Numerous other aspects are provided.