PDCCH Common Control Signaling Across Multiple Aggregation Levels
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting common control information to user equipment (UEs) with different capabilities, leading to inefficiencies in resource utilization and compatibility issues due to varying aggregation levels.
Innovation Solution
The implementation of common control signaling that can be decoded at multiple aggregation levels, allowing UEs with different capabilities to interpret the same signaling, thereby improving resource utilization and ensuring compatibility between UEs with larger and smaller aggregation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common control signaling is transmitted at a larger aggregation level to improve coverage for certain UEs, then coverage is improved, but resource utilization increases and processor/memory usage increases
Solution Approach 1:
The PDCCH candidate is segmented into multiple parts, where a first part is used for common DCI detectable at a second (smaller) aggregation level, and a second part is used for UE-specific DCI detectable at a first (larger) aggregation level. This segmentation allows different UEs to decode only the portions they need, improving resource efficiency while maintaining coverage for all UE types.
2Adaptability or versatility
If common control signaling is transmitted at a larger aggregation level to ensure compatibility with UEs using larger aggregation levels, then compatibility is improved, but resource utilization increases
Solution Approach 1:
The PDCCH candidate structure is designed to serve multiple functions: it carries both common DCI (accessible by all UEs at smaller aggregation level) and UE-specific DCI (accessible at larger aggregation level). This multi-functionality ensures compatibility with different UE capabilities while optimizing resource utilization by avoiding redundant transmissions.
3Adaptability or versatility
If separate control signaling is transmitted for UEs at different aggregation levels to ensure each UE type can decode, then compatibility is improved, but resource utilization increases due to multiple transmissions
Solution Approach 1:
The patent merges common control signaling and UE-specific control signaling into a single PDCCH candidate structure. The common DCI is placed in a first part detectable at a smaller aggregation level, while UE-specific DCI is placed in a second part detectable at a larger aggregation level. This merging eliminates the need for separate transmissions, improving resource utilization while maintaining compatibility.
4Loss of energy
If common control signaling is transmitted once at a smaller aggregation level to reduce resource usage, then resource utilization is improved, but coverage is reduced for certain UEs
Solution Approach 1:
The system dynamically adapts the aggregation level used for decoding based on UE capability. The PDCCH candidate is structured so that UEs can selectively decode at appropriate aggregation levels: common DCI at smaller aggregation level for resource efficiency, and UE-specific DCI at larger aggregation level for improved coverage when needed.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive common downlink control information (DCI) included in a physical downlink control channel (PDCCH) candidate, wherein the PDCCH candidate has a first size associated with a first aggregation level, wherein the common DCI is detectable at the first aggregation level by decoding the PDCCH candidate and detectable at a second aggregation level, smaller than the first aggregation level, by decoding a part of the PDCCH candidate, and wherein the part of the PDCCH candidate has a second size associated with the second aggregation level. The UE may communicate based at least in part on the common DCI. Numerous other aspects are described.