DCI Format Identification via Implicit Payload Bits
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Solution Overview
Problem
Legacy LTE systems face challenges in identifying DCI formats without identifier fields, which is a concern for future radio communication systems like NR and 5G that use different DCI formats, potentially leading to communication processing inefficiencies.
Innovation Solution
The user terminal employs a receiving section to identify DCI formats with identical payloads and scramble identifiers by utilizing an identifier field within each DCI, allowing for appropriate communication processing even without explicit identifier fields, and potentially reducing overhead by using identifier fields as virtual CRC bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If identifier fields are removed from DCI formats to reduce overhead, then overhead is reduced, but DCI format identification becomes difficult when payloads and scramble identifiers are identical
Solution Approach 1:
The patent introduces a new intermediary mechanism: a specific bit position within the DCI payload itself serves as an implicit format identifier. This bit acts as a mediator that enables DCI format differentiation without requiring separate identifier fields, thus resolving the contradiction between reducing overhead and maintaining identification capability
Solution Approach 2:
The patent merges the identification function with the existing DCI payload structure by designating a specific bit within the payload as the format identifier. This combines multiple functions (data transmission and format identification) into a single integrated structure, eliminating the need for separate identifier fields and reducing overall overhead
2Reliability
If legacy LTE DCI identification methods are used in future radio communication systems, then identification of DCI formats with different payloads is achieved, but the systems cannot efficiently handle DCI formats with identical payloads and scramble identifiers
Solution Approach 1:
The patent changes the identification parameter from external identifier fields to an internal payload bit. By designating a specific bit position within the DCI payload as the format identifier, the system maintains reliable identification while adapting to future requirements where DCI formats may have identical payloads and scramble identifiers
Solution Approach 2:
The patent creates a universal identification mechanism that works for both legacy and future DCI formats. The implicit identifier bit approach can handle DCI formats with different payloads (like legacy systems) as well as DCI formats with identical payloads and scramble identifiers (future systems), providing broad compatibility and versatility
Data Source
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AI summary
One aspect of a user terminal according to the present invention includes: a receiving section that receives a plurality of pieces of Downlink Control Information (DCI) whose payloads are identical and whose identifiers used to scramble a cyclic redundancy check bit are identical; and a control section that controls communication processing based on an identifier field value included in each of the plurality of pieces of DCI, the communication processing being based on each of the plurality of pieces of DCI.