Downlink Control Information Configuration for MU-MIMO Efficiency
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Solution Overview
Problem
In wireless communication systems, particularly in MIMO systems, there is a need to prevent unnecessary information from being included in downlink control information and to effectively transmit this information to ensure efficient data transmission.
Innovation Solution
A method is introduced that configures downlink control information with specific fields such as a PMI confirmation field and a TPMI information field, which include an offset value for power or interference information, allowing for efficient transmission and reception of downlink data in MU-MIMO systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If downlink control information is configured with fixed formats including PMI confirmation fields and TPMI information fields, then control information structure is standardized and easy to process, but unnecessary information is included when using MU-MIMO, increasing information redundancy
Solution Approach 1:
The patent applies dynamics by making the downlink control information format adaptable rather than fixed. The base station dynamically selects and configures the appropriate format (first format with PMI confirmation field for SU-MIMO, second format without it for MU-MIMO) based on the detected MIMO mode, thereby eliminating unnecessary information while maintaining standardized processing benefits
Solution Approach 2:
The patent changes the parameter of control information format configuration based on the MIMO operating mode. When switching between SU-MIMO and MU-MIMO modes, the system adjusts the control information format parameters (specifically the inclusion/exclusion of PMI confirmation field and TPMI information field) to match the current operational requirements, thus optimizing information efficiency
2Reliability
If PMI confirmation field and TPMI information field are always included in downlink control information, then precoding information is always available for SU-MIMO, but the control information becomes unnecessarily complex for MU-MIMO operations
Solution Approach 1:
The patent extracts and removes unnecessary fields (PMI confirmation field and TPMI information field) from the downlink control information when operating in MU-MIMO mode. This extraction principle reduces control information complexity while maintaining the necessary precoding functionality through alternative mechanisms appropriate for MU-MIMO operations
Solution Approach 2:
The patent creates a universal downlink control information system that can function in both SU-MIMO and MU-MIMO modes through format selection. The system maintains reliability across different MIMO modes by providing appropriate precoding information through format-appropriate fields, making the control information system multi-functional rather than mode-specific
3Measurement precision
If the downlink control information uses a fixed format suitable for SU-MIMO, then precoding confirmation is accurate for single-user systems, but it transmits unnecessary confirmation messages in multi-user MIMO systems
Solution Approach 1:
The patent applies dynamics by making the control information format adaptable rather than fixed. The base station dynamically selects and configures the appropriate format (first format with PMI confirmation field for SU-MIMO, second format without it for MU-MIMO) based on the detected MIMO mode, thereby eliminating unnecessary information while maintaining standardized processing benefits
Solution Approach 2:
The patent extracts and removes unnecessary fields (PMI confirmation field and TPMI information field) from the downlink control information when operating in MU-MIMO mode. This extraction principle reduces control information complexity while maintaining the necessary precoding functionality through alternative mechanisms appropriate for MU-MIMO operations
Data Source
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AI summary
A method of transmitting control information in a wireless communication system is provided. The method includes configuring downlink control information including a plurality of information fields according to a format of scheduling for transmission of a single codeword in a spatial multiplexing mode, wherein the plurality of information fields include a precoding matrix indicator (PMI) confirmation filed for indicating whether precoding is performed on downlink data by using a PMI reported by a user equipment and a transmitted precoding matrix indicator (TPMI) information field for indicating a codebook index, and at least one of the PMI confirmation field and the TPMI information field indicates an offset value of power for the downlink data transmission or interference information for the downlink data transmission, and transmitting the downlink control information.