DCI Antenna Port Bitwidth Adaptation for Reliable PDSCH Reception
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Solution Overview
Problem
In fifth-generation cellular systems, reduced UE complexity leads to compromised DL/UL channel coverage and reception/transmission reliability, necessitating improved communication efficiency and flexibility.
Innovation Solution
Implementing methods for DCI field size reduction by determining the bitwidth of the antenna port field based on RRC parameters, including entries for 'number of DMRS CDM groups without data' and DMRS port indexes, to enhance reception and transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If UE complexity is reduced by lowering Rx/Tx antennas, MIMO layers, and RF bandwidth, then device cost and complexity decrease, but DL/UL channel coverage and reception/transmission reliability deteriorate
Solution Approach 1:
The patent changes the parameter of DCI field bitwidth dynamically based on RRC configuration. By adjusting the antenna port field bitwidth according to the number of DMRS CDM groups without data, the system optimizes control information efficiency without requiring additional hardware complexity, thus improving reliability while maintaining low device complexity
Solution Approach 2:
The patent introduces dynamic adaptation of DCI format parameters through RRC configuration. The antenna port field bitwidth is not fixed but adapts based on the configured DMRS CDM groups, allowing the system to optimize performance for different service types and channel conditions without increasing hardware complexity
2Productivity
If DCI field bitwidth is reduced for lower complexity, then processing efficiency improves, but coverage and reliability may be compromised
Solution Approach 1:
The patent optimizes the antenna port field bitwidth parameter based on actual configuration needs. By setting the bitwidth to match the number of DMRS CDM groups without data (e.g., 0, 1, or 2 bits), the system achieves efficient processing without excessive overhead, while maintaining sufficient information for reliable communication
Solution Approach 2:
The patent extracts only the necessary bitwidth information needed for antenna port indication. By removing unnecessary bits from the DCI antenna port field based on the actual number of DMRS CDM groups configured, the system reduces overhead and improves processing efficiency while retaining essential coverage and reliability information
Data Source
AI summary
A method by a user equipment (UE) is described. The method includes receiving, from a base station, a first radio resource control (RRC) parameter including one or more entries, wherein each entry at least provides a value for ‘number of DMRS CDM groups without data’ and one value for one DMRS port index among one or more DMRS port indexes; and determining a bitwidth of an antenna port field in a DCI format at least based on a total count of the one or more entries included in the first RRC parameter; and receiving the DCI format with the antenna port field, wherein a value of the antenna port field indicates one of the one or more entries; and receiving a PDSCH scheduled by the DCI format based on the value of the ‘number of DMRS CDM groups without data’ and the DMRS port index associated to an entry corresponding to a value indicated in the antenna port field.