Cross-Block Check Blocks for MIMO HARQ Retransmission
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Solution Overview
Problem
Existing retransmission schemes for ultra-reliable low-latency communication (URLLC) applications, particularly those involving large packets, face challenges in meeting stringent delay and reliability requirements.
Innovation Solution
The proposed solution involves a MIMO retransmission scheme that uses cross-block check blocks generated from bits selected across multiple packets transmitted over multiple MIMO layers, enabling more efficient use of transmission resources compared to conventional HARQ retransmission schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ retransmission schemes are used for large packets in URLLC applications, then reliability requirements can be met through multiple retransmissions, but the delay requirement cannot be satisfied due to the large number of retransmissions needed
Solution Approach 1:
The patent segments the large packet into multiple code blocks, which are then distributed across multiple MIMO layers. This segmentation allows the receiver to decode successfully received layers and use cross-layer check blocks from other layers to assist in decoding failed layers, reducing the need for multiple retransmissions and thereby reducing delay while maintaining reliability
Solution Approach 2:
The patent introduces cross-layer check blocks that span across multiple MIMO layers, creating a new dimension of redundancy. Instead of traditional within-layer check blocks, the check blocks are generated from information bits selected across multiple layers, enabling inter-layer decoding assistance that reduces retransmission requirements
2Reliability
If multiple initial transmissions are used to satisfy reliability requirements in network coding-based schemes, then reliability can be achieved, but additional delay is introduced
Solution Approach 1:
The patent performs preliminary encoding by generating cross-layer check blocks from information bits of multiple code blocks across multiple MIMO layers before transmission. These check blocks are prepared in advance and can be immediately used by the receiver to assist decoding, eliminating the need for multiple initial transmissions and reducing delay
Solution Approach 2:
The cross-layer check blocks act as intermediaries that carry decoding information across MIMO layers. These check blocks enable the receiver to use successfully decoded layers to assist in decoding failed layers, serving as a mediator that reduces the need for additional transmissions
Data Source
AI summary
Methods and apparatuses for performing MIMO transmissions are described. Retransmission schemes are described for MIMO transmissions. In an example, a transmitter node obtains a plurality of packets to be transmitted to an intended receiver node over a plurality of MIMO layers. A set of one or more cross-block check blocks is generated, where the set of one or more cross-block check blocks being is using a plurality of bits selected from across two or more packets to be transmitted over respective two or more MIMO layers. The set of one or more cross-block check blocks is transmitted over one or more MIMO layers.