Uplink MIMO HARQ Control Information Segmentation
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Solution Overview
Problem
The legacy 3GPP LTE system lacks definitions for HARQ operations and control information methods to support uplink multiple codeword transmission with multiple antennas, limiting efficient and correct MIMO transmission.
Innovation Solution
A method for transmitting control information in uplink MIMO transmission, including scheduling transport blocks through a physical downlink control channel, acknowledging received blocks via a PHICH, and performing retransmissions using a precoder subset, ensuring consistent layer usage for NACK transport blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy 3GPP LTE system HARQ operations are used for uplink transmission, then single antenna single codeword transmission is supported, but uplink MIMO transmission with multiple codewords cannot be supported
Solution Approach 1:
The patent segments the control information construction into distinct components: PHICH resource selection based on lowest PRB index, layer indication for MIMO transmissions, and codeword-specific HARQ process identification. This segmentation allows the system to support complex uplink MIMO operations while maintaining manageable control signal structures.
Solution Approach 2:
The patent creates a universal control information framework that handles both single-antenna single-codeword transmissions and multi-antenna multi-codeword MIMO transmissions through the same PHICH and PDCCH mechanisms. The layer indication field and extended HARQ process number enable the system to adapt to different transmission modes without requiring separate control channels.
2Productivity
If multiple codewords are transmitted in uplink MIMO, then data transmission capacity increases, but the complexity of HARQ acknowledgment and retransmission control increases
Solution Approach 1:
The patent introduces a new dimension for HARQ control by adding layer indication fields and codeword-specific HARQ process numbers to the existing control structure. This dimensional extension allows the system to track and manage multiple codewords and layers independently, enabling multi-codeword MIMO transmission while maintaining systematic HARQ control through extended process identifiers.
Data Source
AI summary
The present invention relates to a method for transmitting control information regarding uplink multiple antenna transmission in a base station according to one embodiment of the present invention may comprise the steps of: transmitting DCI for scheduling uplink transmission of a plurality of data blocks through a PDCCH; receiving the plurality of data blocks scheduled by the DCI using a plurality of layers; transmitting through a PHICH, information which indicates ACK or NACK for each of the plurality of received data blocks; and receiving a retransmission of the negative-acknowledged data blocks using one or more layers. When the number of the negative-acknowledged data blocks is not the same as the number of data blocks indicated in the PDCCH, one or more layers may be the same as those used in a previous transmission of the negative-acknowledged data blocks.