Transport Channel Sub-Carrier Puncturing for Low-PAPR LTE MTC Uplink
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Solution Overview
Problem
Existing LTE and eMTC technologies face challenges in efficiently managing peak-to-average power ratio (PAPR) and resource allocation for machine-type communication (MTC) devices, particularly in scenarios with high path loss, leading to reduced transmission efficiency and increased interference.
Innovation Solution
Implementing a transport channel processing chain with sub-carrier puncturing and rearrangement, allowing for sub-PRB PUSCH transmissions, which include puncturing and rearranging subcarriers in each subframe to optimize resource usage and reduce PAPR, while being compatible with legacy hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-carrier puncturing is implemented to allow more user equipment to be multiplexed into the same resource, then transmission efficiency and network capacity are improved, but the complexity of the transport channel processing chain increases
Solution Approach 1:
The patent segments the physical resource block into smaller units by puncturing specific subcarriers, allowing finer-grained resource allocation. This enables multiple user equipment to be multiplexed into the same resource more efficiently, directly improving transmission efficiency and network capacity while managing complexity through structured segmentation of the processing chain.
2Quantity of substance
If sub-carrier puncturing and rearrangement are performed to reduce PAPR, then power amplifier backoffs are reduced and more devices can be supported, but the processing time and computational resources increase
Solution Approach 1:
The patent performs sub-carrier puncturing and rearrangement as preliminary actions in the transport channel processing chain, before the actual data transmission. By pre-configuring the resource allocation pattern and identifying which subcarriers need to be punctured, the system reduces the computational burden during transmission and enables faster processing, thus supporting more devices without proportionally increasing processing time.
3Adaptability or versatility
If legacy hardware is used without modifications, then device compatibility is maintained, but the ability to support advanced MTC features and high path loss scenarios is limited
Solution Approach 1:
The patent changes the parameters of the existing transport channel processing chain by introducing sub-carrier puncturing and rearrangement operations. These parameter changes enable the system to optimize resource allocation for MTC scenarios with high path loss while maintaining compatibility with legacy hardware, as the modifications are integrated into the existing processing framework rather than requiring fundamental hardware changes.
Data Source
AI summary
An apparatus comprising circuitry configured to perform a transport channel processing chain, the transport channel processing chain comprising a sub-carrier puncturing function, the sub-carrier puncturing function comprising puncturing, in each subframe of a composite transmission time interval, a set of subcarriers from at least one mapped physical resource block.