PDCCH Decoding Limits for More Valid Unicast DCI per Span
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Solution Overview
Problem
In Release 15 (Rel-15) of wireless communication standards, cross carrier scheduling (CCS) with different numerologies between scheduling and scheduled cells is not supported, particularly for frequency range FR1 scheduling FR2, which limits the number of valid unicast DCIs per span, hindering contiguous data transmission.
Innovation Solution
The method involves increasing the maximum number of valid unicast DCIs per span or per monitoring occasion by configuring the UE with a set of search spaces and CORESETs, determining the number of PDCCHs that can be decoded, and implementing early stopping of PDCCH processing when the maximum number is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the maximum number of valid unicast DCIs per span is limited according to Rel-15 specifications, then the system maintains compatibility with existing standards and ensures reliable DCI delivery on FR1, but the number of contigous data transmissions on the scheduled FR2 cell is restricted
Solution Approach 1:
The patent applies dynamics by making the maximum number of valid unicast DCIs per span configurable rather than fixed. The network can dynamically adjust this parameter based on the specific service requirements, traffic conditions, and numerology combinations being used. This allows the system to adapt between maintaining strict standard compatibility and enabling enhanced contiguous transmission capabilities when needed.
Solution Approach 2:
The invention changes the parameter of maximum valid unicast DCIs per span from a fixed specification value to a configurable parameter. By introducing RRC configuration mechanisms, the system can modify this parameter to support different numerology combinations (e.g., FR1 scheduling FR2 with different subcarrier spacings), thereby enabling contiguous data transmission while maintaining backward compatibility with Rel-15 devices.
2Adaptability or versatility
If the UE decodes more PDCCHs to support increased DCI scheduling flexibility, then more contiguous data transmissions can be scheduled, but the processing complexity and buffering requirements increase
Solution Approach 1:
The patent applies partial action by allowing the UE to decode only the necessary number of PDCCHs based on configured parameters. Instead of requiring the UE to always prepare for maximum possible DCIs, the system configures appropriate limits that match actual scheduling needs. This reduces unnecessary processing complexity while still providing the flexibility to increase decoding capacity when contiguous transmission requirements demand it.
3Reliability
If cross carrier scheduling with different numerologies is supported, then FR1 can reliably deliver DCI for FR2 scheduling, but the maximum number of valid unicast DCIs per span becomes insufficient for contiguous data transmission
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with appropriate maximum DCI values and search space parameters before data transmission begins. The network performs preliminary assessments of traffic requirements and numerology combinations, then configures optimal parameters in advance through RRC signaling. This ensures both reliable DCI delivery (by maintaining FR1 scheduling) and enables contiguous transmission (by pre-setting appropriate DCI limits) without requiring real-time adjustments during transmission.
Data Source
AI summary
A method and system are provided. The method includes receiving a number of physical downlink control channels (PDCCHs) for decoding, determining a maximum number of valid downlink control information (DCIs) that can be decoded, increasing a maximum number of PDCCHs that can be decoded based on the determined maximum number of valid DCIs, and decoding the number of PDCCHs.