MIMO Retransmission Control for Stream Identification During Mode Switching
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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 struggles to recognize which retained process should be re-sent, leading to errors in data block synthesis and re-sending, due to overlapping process numbers and incorrect identification of streams.
Innovation Solution
A transmission controlling method where data block identification information is annexed to each data block and used to distinguish between streams, ensuring non-competitive identification and allowing for correct re-sending synthesis, even when the number of transmission streams decreases, by using antenna identifiers or group-based number information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO multiplex transmission is used with process numbers for each antenna, then transmission capacity is increased, but process number overlap occurs when switching to diversity transmission causing synthesis errors
Solution Approach 1:
The patent segments the identification space by introducing a stream ID field separate from the process number field. Each antenna system is assigned a unique stream ID, and process numbers are segmented into antenna-specific ranges. This segmentation prevents overlap when switching between multiplex and diversity transmission modes, as the stream ID provides an additional dimension of identification that maintains uniqueness across all streams.
Solution Approach 2:
The patent adds another dimension to the identification system by introducing stream ID as a separate field. Instead of relying solely on process numbers that become ambiguous when antennas are consolidated, the system now uses a two-dimensional identification space (stream ID, process number) that maintains uniqueness even when the number of active antennas changes. This dimensional expansion resolves the contradiction between high-capacity multiplex transmission and reliable diversity transmission.
2Ease of operation
If process numbers are reused across multiple antennas, then identification efficiency is improved, but stream identification accuracy deteriorates during mode switching
Solution Approach 1:
The patent segments the identification function into two separate fields: stream ID for identifying the antenna system and process number for identifying the specific data block within that stream. This segmentation allows process numbers to be reused efficiently within each antenna's namespace while the stream ID ensures global uniqueness, resolving the contradiction between identification efficiency and accuracy during mode transitions.
Solution Approach 2:
The stream ID acts as an intermediary that mediates between the process number and the actual data block. When a data block is received, the stream ID first identifies which antenna system sent it, and then the process number identifies the specific block within that stream's context. This intermediary layer prevents misidentification during mode switching while maintaining efficient process number reuse within each stream.
3Device complexity
If the number of transmission streams is decreased, then system complexity is reduced, but communication continuity is disrupted due to incorrect re-sending
Solution Approach 1:
The patent applies preliminary action by pre-assigning unique stream IDs to each antenna system before mode switching occurs. When the system transitions from multiplex to diversity transmission, the stream ID already provides the necessary identification information to correctly match received data blocks with their corresponding streams, eliminating the need for complex re-synchronization and ensuring communication continuity without disrupting the reduced-complexity diversity mode.
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 including on the sender apparatus, sending process information which prevent plurality of data blocks from competing to the receiver apparatus with a control channel; and on the receiver apparatus, combining, based on the process information, the data block received already and a re-sent data block.