MIMO HARQ Process Identification During Stream Switching
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Solution Overview
Problem
In MIMO transmission systems, changing from MIMO multiplex transmission to MIMO diversity transmission can lead to issues with process number overlap and re-sending errors due to the decrease in the number of transmission streams, causing communication disruptions.
Innovation Solution
A transmission controlling method that includes annexing data block identification information to each data block to prevent competitive identification between streams, allowing the receiver to correctly synthesize re-sent data blocks and maintain normal communication flow by using antenna identifiers or group-based number information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MIMO multiplex transmission is changed to MIMO diversity transmission, then transmission reliability is improved, but process number overlap occurs causing communication disruptions
Solution Approach 1:
The patent introduces a new dimension of identification by combining process numbers with antenna identifiers. Instead of using only process numbers (one-dimensional identification), the system now uses a two-dimensional identification scheme where each data block is identified by both its process number and the antenna from which it was transmitted. This dimensional expansion resolves the overlap problem while maintaining reliability.
Solution Approach 2:
The antenna identifier acts as an intermediary element that mediates between the process number and the actual data block identification. When process numbers overlap during transmission mode switching, the antenna identifier serves as an additional distinguishing factor that allows the receiver to correctly identify and synthesize the appropriate data blocks without confusion.
2Device complexity
If the number of transmission streams is decreased, then device complexity is reduced, but data block re-sending errors occur due to identification conflicts
Solution Approach 1:
By adding the antenna identifier dimension to the process number, the system maintains unique identification capability even when the number of streams decreases. This prevents re-sending errors that would otherwise occur due to identification conflicts, while still allowing for simplified stream management.
3Productivity
If process numbers are reused across multiple antennas, then productivity is improved, but measurement precision of process identification deteriorates
Solution Approach 1:
The patent resolves this contradiction by adding the antenna identifier as a second dimension to the identification system. This allows process numbers to be reused across multiple antennas (improving productivity) while the antenna identifier maintains precise identification accuracy by distinguishing which antenna transmitted each data block.
Data Source
AI summary
A wireless communication system including a sender apparatus having a plurality of transmitting antennas that performs MIMO transmission of a plurality of data blocks; and a receiver apparatus that receives the plurality of data blocks. The sender apparatus transmits a process number via a control channel different from a data channel to the receiver apparatus, and wherein when the MIMO diversity transmission is performed, the receiver apparatus performs HARQ processing in the received data blocks based on not a process number which prevents the data blocks from competing but the received process number from the sender apparatus.