PDCCH Repetition Capability Signaling for Reliable UE Control Reception
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Solution Overview
Problem
Wireless communications systems face challenges in determining which user equipment (UEs) are capable of receiving and decoding physical downlink control channel (PDCCH) repetitions, such as single-frequency network (SFN), inter-slot, or intra-slot repetitions, leading to reduced communication reliability and diversity.
Innovation Solution
UEs signal their capability to support multiple related PDCCH transmissions through a capability report, indicating support for SFN, inter-slot, or intra-slot repetitions, along with associated parameters, allowing the network to configure PDCCH reception accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network transmits multiple PDCCH repetitions to all UEs, then communication reliability is improved, but network complexity and resource overhead increase
Solution Approach 1:
The patent changes the parameter of PDCCH transmission by introducing a capability indicator that UEs report to the network. Based on this indicator, the network dynamically adjusts whether to transmit PDCCH repetitions (multiple transmissions with same DCI) or single PDCCH transmissions. This parameter change allows the system to adapt between reliability-enhanced mode (for UEs that support it) and normal mode (for UEs that don't support repetitions), resolving the contradiction between improving reliability and reducing network complexity.
2Reliability
If the network configures PDCCH repetitions for UEs, then transmission diversity is improved, but device compatibility issues arise
Solution Approach 1:
The patent introduces dynamic adaptability through a capability indicator mechanism. UEs report whether they support PDCCH repetitions, and the network dynamically configures transmission modes accordingly. This creates a dynamic system where the network can switch between repetition-based transmission (for UEs with capability) and standard transmission (for UEs without capability), ensuring broad device compatibility while still providing transmission diversity benefits to capable devices.
3Reliability
If UEs monitor multiple PDCCH transmissions, then decoding reliability is improved, but UE processing complexity increases
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously report their capability to monitor multiple PDCCH transmissions. The network then uses this self-reported information to configure appropriate transmission modes. This self-service approach allows UEs with sufficient processing capability to opt-in to more reliable multi-transmission monitoring, while UEs with limited capability can opt-out, thus managing UE processing complexity individually rather than imposing uniform requirements on all devices.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a UE capability to support receipt of multiple related downlink control channel transmissions, where the multiple related downlink control channel transmissions that are supported are one or more of single-frequency network (SFN) downlink control channel transmissions, intra-slot downlink control channel repetitions, or inter-slot downlink control channel repetitions, and are associated with one or more control resource sets. The UE may receive, from the base station based on transmission of the UE capability, a configuration for receiving the multiple related downlink control channel transmissions. The UE may then monitor a downlink control channel in accordance with the configuration.