DM-RS Antenna Port Indication in LTE-A Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-A systems, the existing method for notifying User Equipment (UE) of DM-RS resource information is inefficient, using 10 bits to inform the UE of DM-RS patterns and antenna ports, which is redundant and reduces system throughput. Additionally, this method does not provide interference-related information, limiting the UE's ability to measure and cancel interference effectively.
Innovation Solution
A method is proposed to efficiently transmit DM-RS resource information to the UE by using control information that includes transport block information and antenna port related information. This method allows the UE to identify whether a codeword 0 is enabled and codeword 1 is disabled, or both are enabled, and interprets the antenna port information accordingly. The eNB determines the appropriate antenna port information based on the transport block configuration and transmits this information to the UE using a minimum number of control bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 10 bits are used to notify the UE of DM-RS patterns and antenna ports, then the UE can accurately identify DM-RS resources, but the control information overhead increases and system throughput decreases
Solution Approach 1:
The patent extracts and separates the DM-RS antenna port indication from the general resource allocation information. By using dedicated fields (e.g., DMRS-Scrambling-ID, DMRS-Port-Indication) rather than general-purpose bit fields, the system achieves precise DM-RS identification with reduced overhead. This extraction principle allows the control information to be more targeted and efficient.
Solution Approach 2:
The patent changes the parameter structure of control information by introducing specific DM-RS related parameters (DMRS-Scrambling-ID, DMRS-Port-Indication, dmrs-Type-1-Position) instead of using generic resource allocation parameters. This parameter transformation enables more efficient encoding and reduces the total bit overhead while maintaining accurate DM-RS resource identification.
2Measurement precision
If reference signal resources are increased to improve channel measurement performance, then channel estimation accuracy improves, but traffic channel resources decrease
Solution Approach 1:
The patent enables dynamic DM-RS resource allocation by allowing the eNB to flexibly configure and indicate DM-RS parameters (scrambling ID, port indication, type-1 position) based on current channel conditions and traffic requirements. This dynamic approach optimizes the balance between reference signal overhead and traffic channel capacity, ensuring sufficient channel estimation accuracy while maximizing data transmission resources.
Solution Approach 2:
The patent segments the DM-RS resource configuration into multiple independent parameters (scrambling ID, port indication, position) that can be individually optimized. This segmentation allows the system to allocate DM-RS resources precisely where needed without unnecessarily increasing overall reference signal overhead, thereby preserving more resources for traffic channels.
3Productivity
If control information is reduced to increase system throughput, then resource allocation efficiency improves, but interference measurement capability deteriorates
Solution Approach 1:
The patent designs the DM-RS configuration parameters to serve multiple functions simultaneously. The same DM-RS resources configured through the compact parameter indication mechanism are used both for channel estimation and for interference measurement. This multi-functionality ensures that interference measurement capability is maintained without requiring additional dedicated resources, thus preserving system throughput.
Data Source
AI summary
A control information interpretation method of a terminal and a base station in a mobile communication system, and a terminal and a base station concerning the same, respectively, are provided. The control information interpretation method of a terminal includes receiving, by the terminal, control information including transport block information and antenna port related information; identifying whether a codeword 0 is enabled and a codeword 1 is disabled, or both the codeword 0 and the codeword 1 are enabled based on the transport block information; and interpreting the antenna port related information according to a result of the identification.