DCI Format Indication for Selective Downlink Field Decoding
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) consumes time and processing resources by blindly decoding all fields of downlink control information (DCI) assuming they have changed, despite many fields remaining unchanged over multiple consecutive transmissions, which can be inefficient.
Innovation Solution
A network entity indicates which DCI fields remain unchanged, allowing the UE to decode only the changed fields, thereby reducing unnecessary decoding and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE blindly decodes all DCI fields assuming they have changed, then the decoding is comprehensive and reliable, but the time and processing resources are wasted
Solution Approach 1:
The DCI message is segmented into two distinct parts: unchanged fields and changed fields. The network entity indicates which fields remain unchanged, allowing the UE to segment its decoding effort accordingly. The UE only performs blind decoding on the changed fields portion, while accepting the unchanged fields as inherited from the previous DCI, thus reducing decoding time while maintaining reliability.
Solution Approach 2:
The network entity performs preliminary action by indicating which DCI fields will remain unchanged before the UE performs decoding. This advance information allows the UE to prepare by only decoding the necessary changed fields, avoiding redundant decoding operations on unchanged fields while ensuring comprehensive reception of all necessary information.
2Loss of information
If the UE decodes all DCI fields every time, then no information is missed, but processing resources are consumed unnecessarily
Solution Approach 1:
The unchanged fields are extracted from the full DCI message and identified by the network entity through indication information. The UE extracts only the changed fields for decoding operations, while the unchanged fields are taken from the previous DCI reception. This extraction approach ensures no information is lost while minimizing processing energy consumption.
Solution Approach 2:
Instead of performing excessive action by decoding all fields, the UE performs partial action by decoding only the changed fields portion of the DCI message. The network entity provides indication information that defines the scope of changed fields, enabling the UE to perform exactly the necessary decoding operations without redundancy, thus conserving processing energy while maintaining information completeness.
3Loss of information
If the network entity transmits all DCI fields, then complete information is provided, but the transmission overhead increases
Solution Approach 1:
The network entity merges the unchanged fields indication with the DCI transmission by providing format indication information that identifies which fields remain unchanged. This merging approach allows the receiver to reconstruct the complete DCI information by combining the indicated unchanged fields with the transmitted changed fields, reducing transmission overhead while maintaining information completeness.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a UE may receive a format indication of a DCI format that includes one or more changed fields having changed values with respect to a previous DCI and one or more unchanged fields having unchanged values with respect to the previous DCI. The UE may receive DCI having the DCI format. The UE may decode the one or more changed fields and not the one or more unchanged fields. Numerous other aspects are described.