PDCCH DCI Decoding Using Assumed Field Values
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Solution Overview
Problem
Wireless communications systems face challenges in efficiently allocating downlink channel resources for downlink control information (DCI) to achieve high robustness and coverage while minimizing time and frequency resource usage, leading to reduced cell capacity.
Innovation Solution
Techniques for leveraging DCI field values that are not frequently updated or expected to differ for different scheduling grants, allowing devices to assume respective values for decoding DCI, thereby reducing the need for time and frequency resources while maintaining high PDCCH performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink channel resources are allocated to ensure high robustness and coverage for DCI transmission, then DCI decoding reliability is improved, but time and frequency resource usage increases, leading to reduced cell capacity
Solution Approach 1:
The patent extracts and identifies specific DCI fields that are not frequently updated or are expected to remain constant across multiple transmissions. By separating these static fields from dynamic fields, the system can assume predetermined values for the static fields, thereby reducing the number of bits that need to be transmitted and decoded, which directly reduces time and frequency resource usage while maintaining decoding reliability.
Solution Approach 2:
The patent changes the parameter of DCI field values by introducing assumed values for fields that do not frequently update. Instead of transmitting all DCI fields with full detail, the system modifies the transmission approach by using predetermined assumptions for certain fields, which reduces the information payload size and consequently reduces the resources required for reliable transmission.
2Measurement precision
If all DCI fields are transmitted with full detail to ensure accurate decoding, then decoding accuracy is improved, but transmission overhead increases, reducing network utilization efficiency
Solution Approach 1:
The patent extracts and identifies specific DCI fields that are not frequently updated or are expected to remain constant across multiple transmissions. By separating these static fields from dynamic fields, the system can assume predetermined values for the static fields, thereby reducing the number of bits that need to be transmitted and decoded, which directly reduces time and frequency resource usage, which is equivalent to reducing transmission overhead.
3Productivity
If DCI fields that are not frequently updated are identified and assumed, then resource allocation efficiency is improved, but the complexity of field identification and assumption management increases
Solution Approach 1:
The patent applies preliminary action by pre-identifying and pre-configuring which DCI fields are not frequently updated or are expected to remain constant. The network side and device side both establish predetermined assumptions for these fields in advance, which simplifies the actual transmission and decoding processes. This preliminary configuration reduces the complexity during runtime operations despite the initial setup effort.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for allocating downlink channel resource(s) for a device supporting known downlink control information (DCI) values. A method generally includes receiving an indication of one or more DCI fields that indicates to assume a respective value for each of the one or more DCI fields to attempt to decode a downlink control channel candidate; and attempting to decode the downlink control channel candidate to obtain DCI based on the respective value for each of the one or more DCI fields.