PDCCH Candidate Repetition for Reduced-Antenna UE Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fifth-generation cellular systems, wireless communication devices with reduced antennas and RF bandwidth face challenges in PDCCH channel coverage and reception reliability, leading to inefficient communication.
Innovation Solution
Implementing PDCCH candidate repetition across multiple monitoring occasions, determined by RRC parameters, to enhance reception and transmission reliability and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of Rx/Tx antennas and RF bandwidth are reduced to lower UE complexity and cost, then device complexity and cost are reduced, but PDCCH channel coverage and reception reliability deteriorate
Solution Approach 1:
The base station performs preliminary actions by determining PDCCH candidate repetition values and configuring monitoring occasions before actual PDCCH transmission. The UE is pre-configured with repetition parameters and monitoring occasion patterns, enabling it to proactively receive and combine repeated PDCCH candidates across multiple occasions, thereby compensating for reduced antenna and bandwidth capabilities
Solution Approach 2:
The invention implements periodic transmission of PDCCH candidates across multiple monitoring occasions with configured periodicity. The UE monitors PDCCH candidates at regular intervals determined by the repetition parameter, accumulating signal energy through periodic reception and combining, which enhances reception reliability despite reduced hardware capabilities
2Device complexity
If the number of Rx/Tx antennas and RF bandwidth are reduced to lower UE complexity and cost, then device complexity and cost are reduced, but PDCCH channel coverage deteriorates
Solution Approach 1:
The base station pre-determines the repetition value based on UE capabilities and channel conditions before transmission. This preliminary configuration enables the UE to know in advance how many times to expect PDCCH candidate repetitions, allowing it to prepare appropriate combining resources and extend effective coverage without additional hardware
Solution Approach 2:
The base station creates multiple copies of the PDCCH candidate and transmits them across different monitoring occasions. The UE receives these copied signals and combines them, effectively extending the coverage range by accumulating signal energy from multiple transmissions rather than relying on single-shot reception with high-performance hardware
3Reliability
If PDCCH candidate repetition is implemented across multiple monitoring occasions, then reception reliability and coverage are improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The invention manages configuration complexity by introducing parameterization - the repetition value is configured as a variable parameter that can be adjusted based on UE capabilities and channel conditions. This allows the system to adapt the level of repetition (and thus reliability) without redesigning the entire PDCCH structure, balancing reliability improvement with manageable configuration overhead
Data Source
AI summary
A method by a user equipment (UE) is described. The method includes receiving, from a base station, a first radio resource control (RRC) parameter related to a first search space set, receiving a second RRC parameter related to a control resource set (CORESET) wherein the CORESET is associated with the first search space set, monitoring a set of PDCCH candidates for the first search space set, wherein each PDCCH candidate is repeated in a first total number of one or more PDCCH monitoring occasions starting from a first slot, the first slot is determined based on the first RRC parameter.