Adaptive Precoding Scheme for Uplink Control Signal Errors
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Solution Overview
Problem
Existing wireless communication systems face difficulties in scheduling radio resources effectively due to errors in uplink control signals, particularly in multiple antenna systems, which can lead to inefficiencies in data transmission.
Innovation Solution
A method is introduced to handle errors in uplink control signals by determining a precoding scheme, either based on the received Precoding Matrix Indicator (PMI) or using a secondary MIMO transmit scheme, to ensure reliable data transmission, where the PMI is used to precode downlink data and transmit it on a downlink data channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If precoding is applied according to received PMI in uplink control signals, then data transmission efficiency is improved, but errors in uplink control signals cause scheduling difficulties and reduce reliability
Solution Approach 1:
The patent changes the parameter of precoding application from blind application based on received PMI to conditional application. The base station determines whether to apply precoding based on error detection results of uplink control signals, transforming the parameter from fixed to adaptive, thereby resolving the contradiction between transmission efficiency and scheduling reliability
Solution Approach 2:
The patent introduces a feedback mechanism where the base station detects errors in uplink control signals and adjusts downlink precoding accordingly. When errors are detected, the base station switches to non-precoded transmission or uses alternative PMI, creating a closed-loop feedback system that maintains reliability while preserving efficiency when conditions permit
2Productivity
If multiple antenna system is used to improve data rate, then communication capacity is enhanced, but complexity of error handling in control signals increases
Solution Approach 1:
The patent extracts the error detection and handling function from the general MIMO processing chain and applies it specifically to uplink control signal processing. By separating this function and applying targeted error detection only where needed (in control signals rather than all data), the system achieves MIMO performance benefits while minimizing the complexity overhead of error handling
Data Source
AI summary
A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the precoding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating precoding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined precoding scheme.