MIMO Retransmission Control for Stream-Switch Process Matching
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Solution Overview
Problem
In MIMO transmission systems, when the transmission mode changes from MIMO multiplex transmission to MIMO diversity transmission, the receiver apparatus faces challenges in recognizing which retained process to synthesize, leading to potential errors in re-sending and communication disruptions due to overlapping process numbers and incorrect ACK/NACK signal interpretations.
Innovation Solution
A transmission controlling method that includes annexing data block identification information to each data block, ensuring it is non-competitive between stream data, and using this information for re-sending synthesis in the receiver apparatus, while also detecting a decrease in the number of stream data and adjusting the transmission accordingly to maintain communication continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO multiplex transmission mode is used with process numbers assigned independently for each antenna system, then transmission capacity is increased, but process number overlap occurs when switching to diversity transmission causing recognition errors
Solution Approach 1:
The process number space is segmented by transmission mode. In MIMO multiplex transmission, process numbers are assigned independently for each antenna system (PARC mode). In MIMO diversity transmission, process numbers are assigned globally across all antenna systems. This segmentation prevents overlap and enables accurate recognition when switching between modes.
Solution Approach 2:
The process number assignment mechanism dynamically adapts to the current transmission mode. The system switches between two assignment strategies: independent per-antenna assignment for multiplex transmission and global assignment for diversity transmission. This dynamic adaptation ensures process numbers remain unique and recognizable regardless of the active transmission mode.
2Reliability
If transmission mode changes from multiplex to diversity, then communication reliability is improved through diversity gain, but stream identification becomes ambiguous due to overlapping process numbers
Solution Approach 1:
The system preliminarily establishes different process number assignment rules for different transmission modes before switching occurs. When multiplex transmission is active, per-antenna process numbers are assigned. Before switching to diversity transmission, the system transitions to global process number assignment, preventing identification ambiguity from the outset.
Solution Approach 2:
The process number assignment parameter changes based on transmission mode. In multiplex mode, the assignment parameter is 'per-antenna independent numbering'. In diversity mode, it switches to 'global numbering'. This parameter change ensures that process numbers maintain their identification function across mode transitions.
3Device complexity
If per-antenna rate control (PARC) is used without pre-coding, then device complexity is reduced, but process number management becomes problematic during mode switching
Solution Approach 1:
The process number management system dynamically adjusts its operation based on transmission mode. In multiplex transmission with PARC, independent per-antenna numbering is used. When switching to diversity transmission, the system dynamically transitions to global numbering, simplifying management by ensuring uniqueness without requiring complex coordination during the switch.
Data Source
AI summary
A transmission controlling method for a wireless communication system wherein a plurality of data blocks can be transmitted from a sender apparatus having a plurality of sending antennas to a receiver apparatus, the transmission controlling method includes on the sender apparatus, sending process information which is not competitive between data blocks to the receiver apparatus with a control channel; and sending the data block to the receiver apparatus; and on the receiver apparatus, receiving the data block and the process information from the sender apparatus.