MIMO Antenna Group Configuration for Selective Retransmission

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In MIMO communication systems, the use of single CRC for multiple antennas leads to unnecessary retransmissions when only one or two antennas experience errors, wasting throughput, while employing multiple ARQ processes with multi-CRC increases uplink signaling overheads, making it difficult to control unnecessary retransmissions and reduce feedback information, especially with a large number of antennas.

Innovation Solution

A wireless communication method that adaptively selects a group configuration of multiple antennas and attaches error detection data accordingly, allowing for efficient error detection and reducing unnecessary retransmissions by using multiple CRCs, thereby minimizing feedback information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If single CRC is used for multiple antennas, then device complexity is reduced, but unnecessary retransmissions increase and throughput is wasted

Engineering Contradiction:

Improveerror detection complexityVSAvoidthroughput

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent segments the single CRC function into multiple CRC functions, one for each antenna or substream. This allows independent error detection for each antenna, enabling selective retransmission of only those substreams that contain errors, thereby improving throughput without significantly increasing overall system complexity.

Inventive Principle:

Principle #1Segmentation

2Productivity

If multiple CRC data are used for each antenna, then unnecessary retransmissions are reduced, but uplink signaling overheads and feedback information increase

Engineering Contradiction:

ImprovethroughputVSAvoidfeedback information

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent applies partial action by implementing multiple CRC functions selectively based on the number of antennas and channel conditions. When the number of antennas is large, full multi-CRC may be applied; when antennas are fewer or channels are good, single CRC or reduced multi-CRC is used. This partial application optimizes the balance between reducing unnecessary retransmissions and controlling feedback overhead.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If multiple ARQ processes are employed, then error-free substreams are not retransmitted, but the constraint of sharing single ARQ processing is eliminated increasing system complexity

Engineering Contradiction:

ImprovethroughputVSAvoidARQ processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the single shared ARQ processing into multiple independent ARQ processes, one for each antenna or substream. This segmentation allows each substream to be independently acknowledged and retransmitted, eliminating the constraint of shared ARQ processing and enabling finer-grained error recovery, thus improving throughput while managing complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8194786B2Wireless communication method, wireless transmitter and wireless receiver

Publication Date: 2012.06.05 PANASONIC HOLDINGS CORP

AI summary

A wireless communication method by which unnecessary retransmission request is suppressed and feedback information is reduced at the same time in a MIMO communication system. The wireless communication method is provided for transmitting signals by using a plurality of antennas (314), and has a step of applicably selecting the group configuration of the antennas (314), and a step of adding data to be used for error detection to a signal to be transmitted by using the antennas (314), by following the results of the selection.