Downlink Control Information Signaling for Multiple Antenna Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multiple antenna communication systems face inefficiencies in transmitting downlink control information, particularly in managing codeword swapping and enable/disable operations, which affect data transmission reliability and processing delays.
Innovation Solution
The method involves transmitting null data through specific codewords to adjust spatial multiplexing rates and enable/disable codewords dynamically, while swapping codeword locations to optimize HARQ process block management and reduce overhead in control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple codewords are transmitted simultaneously using spatial multiplexing, then system capacity increases, but control signaling overhead increases due to need for codeword swapping and enable/disable information
Solution Approach 1:
The patent combines multiple codeword control functions (swapping indication and enable/disable indication) into a single downlink control information message. This merging of control functions reduces the total control signaling overhead while maintaining the ability to manage multiple codewords for spatial multiplexing operations
Solution Approach 2:
The downlink control information structure is designed to serve multiple purposes simultaneously: it can indicate codeword swapping, enable/disable individual codewords, and manage HARQ process blocks. This multi-functional control mechanism reduces the need for separate control messages for each function
2Reliability
If codeword swapping is implemented to optimize HARQ management, then data transmission reliability improves, but processing complexity increases
Solution Approach 1:
The patent performs codeword swapping operations in advance based on predicted channel conditions and HARQ requirements. By proactively swapping codewords before transmission issues arise, the system improves reliability while reducing the complexity of real-time decision-making during active transmission
3Adaptability or versatility
If dynamic codeword enable/disable operations are performed, then adaptability to channel conditions improves, but control signaling frequency increases
Solution Approach 1:
The patent merges dynamic codeword enable/disable operations with other control functions into consolidated downlink control information messages. This reduction in control signaling frequency is achieved by combining multiple control operations that would otherwise require separate messages
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A method for efficiently transmitting downlink control information is described. A method for transmitting control information in a multiple antenna system which can simultaneously transmit a maximum of two codewords includes transmitting modulation and coding scheme (MCS) information, a new data indicator (NDI) and a redundancy version (RV) for information blocks transmitted through the two codewords, and transmitting additional control information including at least one of a swapping indicator and enable/disable information. The swapping indicator indicates whether or not swapping occurs between the information blocks transmitted through the two codewords, and the enable/disable information indicates whether or not any one of transmissions through the two codewords is disabled. The swapping indicator is reserved when any one of transmissions through the two codewords is disabled, thereby reducing signaling overhead and efficiently transmitting necessary information.