OFDM Channel Interleaving for Equal Code Block Resource Allocation
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Solution Overview
Problem
Existing communication systems face challenges in efficiently utilizing limited transmission resources, maximizing time and frequency diversity, and minimizing interference between code blocks in OFDM systems, particularly in 3GPP LTE systems.
Innovation Solution
A method for resource allocation in OFDM systems, where a time and frequency resource block is divided into equal duration resource elements, with data blocks segmented into code blocks and assigned resources using specific indexing schemes to ensure equal resource distribution and minimize interference, including formulas for determining the number of data resource elements per code block and indexing schemes for efficient interleaving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data blocks are segmented into multiple code blocks for transmission, then the transmission can utilize available resources more flexibly, but interference between different code blocks increases
Solution Approach 1:
The patent segments a data block into multiple code blocks of equal size, where each code block is assigned to a distinct set of resource elements. This segmentation allows flexible resource utilization while the equal-size design and distinct resource element assignment prevent interference between code blocks, as each code block operates independently on its allocated resources.
2Object-affected harmful factors
If code blocks are assigned to different resource elements, then interference between code blocks is reduced, but the complexity of resource allocation increases
Solution Approach 1:
The patent divides the total resource elements into Nseg distinct sets, where each set is assigned to one code block. This systematic segmentation provides a clear, structured approach to resource allocation that reduces interference while maintaining manageable complexity through regular patterns of assignment.
Solution Approach 2:
Each code block is assigned to specific resource elements with distinct characteristics, allowing each code block to experience different channel conditions. This local differentiation in resource element assignment reduces interference between code blocks while the systematic nature of the assignment keeps allocation complexity manageable.
3Productivity
If unequal numbers of resource elements are assigned to different code blocks, then packing efficiency is maximized, but performance imbalance between code blocks occurs
Solution Approach 1:
The patent enforces that all code blocks have equal size and are assigned an equal number of resource elements. This homogeneity ensures that each code block experiences similar processing conditions and performance characteristics, preventing performance imbalance while still achieving efficient resource utilization through the systematic assignment of distinct resource element sets to each code block.
Data Source
AI summary
A method and apparatus for channel interleaving in a wireless communication system. In one aspect of the present invention, the data resource elements are assigned to multiple code blocks, and the numbers of data resource elements assigned to each code block are substantially equal. In another aspect of the present invention, a time-domain-multiplexing-first (TDM-first) approach and a frequency-domain-multiplexing-first (FDM-first) approach are proposed. In the TDM-first approach, at least one of a plurality of code blocks are assigned with a number of consecutive data carrying OFDM symbols. In the FDM-first approach, at least one of the plurality of code blocks are assigned with all of the data carrying OFDM symbols. Either one of the TDM first approach and the FDM-first approach may be selected in dependence upon the number of the code blocks, or the transport block size, or the data rate.