URLLC Control Channel Reliability With Multi-CORESET DCI
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Solution Overview
Problem
The existing NR wireless communication systems face challenges in ensuring ultra-reliable low-latency communication (URLLC) due to limitations in the reliability of control and data channels, particularly when the time and frequency resources for CORESETs are constrained, which can lead to unreliable PDCCH transmission for URLLC data.
Innovation Solution
The proposed solution involves transmitting multiple DCIs across different CORESETs, BWPs, or CCs to enhance reliability, using techniques such as soft combining, cross-carrier scheduling, and non-slot-based scheduling to improve the reliability and latency of URLLC services, particularly for applications like factory automation and remote surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple DCIs are transmitted across different CORESETs to enhance reliability, then the reliability of PDCCH transmission is improved, but the device complexity and resource consumption increase
Solution Approach 1:
The system segments the control channel transmission by dividing the CORESET into multiple search spaces (first search space and second search space) with different aggregation levels. This segmentation allows independent transmission of DCIs in different search spaces, enabling reliability enhancement through diversity without requiring complete system redesign.
Solution Approach 2:
The patent introduces a search space dimension within the CORESET structure, allowing DCIs to be transmitted across multiple dimensions (different search spaces with different aggregation levels). This dimensional expansion provides additional transmission paths for redundancy without proportionally increasing overall system complexity.
2Reliability
If multiple DCIs are transmitted across different CORESETs to enhance reliability, then the reliability of PDCCH transmission is improved, but the time and frequency resources consumed increase
Solution Approach 1:
Different search spaces are configured with different aggregation levels tailored to their specific requirements. The first search space uses a first aggregation level while the second search space uses a second aggregation level, optimizing resource usage locally in each search space rather than uniformly across the entire CORESET.
Solution Approach 2:
The system transmits DCIs in both search spaces, with the second search space providing additional redundancy only when needed. This partial application of excessive transmission (redundancy) in the second search space enhances reliability without unnecessarily consuming all available resources in every scenario.
3Reliability
If multiple DCIs are transmitted across different CORESETs to enhance reliability, then the reliability of PDCCH transmission is improved, but the latency increases
Solution Approach 1:
The first search space transmits DCIs using a first aggregation level that can be decoded more quickly, providing preliminary information transmission. The second search space with its second aggregation level provides supplemental redundancy that can be processed in parallel, reducing the effective latency penalty of the additional transmission paths.
Data Source
AI summary
The disclosure describes mechanisms for reliability enhancement on control channel and data channel and mechanisms in URLLC. An apparatus of a RAN node for URLLC includes baseband circuitry to configure at least one DCI for scheduling transmission of at least one PDSCH content having same information. For each DCI, the baseband circuitry determines a CORESET for transmitting the DCI. The disclosure further describes mechanisms for the support of low latency transmission in URLLC. To improve peak data rate and spectrum efficiency in FDD system, the RAN node configures a DCI for scheduling data transmission using blank resources of a self-contained slot structure. Further, CBG-based transmission with separate HARQ-ACK feedback is provided to configure a DCI for scheduling data transmission of a TB and to divide the TB into multiple CBGs, and to configure uplink control data to carry separate HARQ feedback for the CBGs.