Wireless Channel Segmentation for LTE Decoding Efficiency
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Solution Overview
Problem
Current wireless communication systems, particularly in the LTE 3GPP UMTS protocol, face challenges in physical channel segmentation due to varying available resources and the need for finer granularity, which affects channel equalization and decoding efficiency.
Innovation Solution
Implementing a physical channel segmentation rule that divides available modulation symbols among code block segments, ensuring each segment occupies an integer number of modulation symbols and using an 'equal-size' or 'equal-rate' rule to distribute symbols, thereby simplifying receiver design and maintaining consistent code rates across segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If physical channel segmentation is applied after concatenating encoded code block segments (as in HSPA), then memory usage of FEC decoder is bounded, but the segmented physical channel resources are not directly identifiable with code block segments, adversely affecting the ability to pipeline channel equalization and channel decoding
Solution Approach 1:
The patent applies segmentation by dividing the physical channel resources into segments that directly correspond to individual code block segments. This is achieved by determining the number of encoded bits for each code block segment independently based on available physical channel resources, rather than concatenating all segments first. The receiver can then directly identify which physical channel resources belong to which code block segment, enabling parallel processing and pipelining of channel equalization and decoding operations.
2Ease of operation
If physical channel resources are segmented to a granularity of 48 modulation symbols (as in WiMAX), then segmented physical channel resources are directly identifiable with code block segments, but all code block segments must have exactly the same code rate, reducing flexibility in systems where available physical channel resources change from frame-to-frame
Solution Approach 1:
The patent implements dynamic segmentation where the number of encoded bits allocated to each code block segment is determined flexibly based on available physical channel resources. The system calculates the total number of encoded bits that can be transmitted and distributes them among code block segments according to their individual requirements and the available resources, allowing code rates to vary between segments while maintaining direct identifiability of physical channel resources with code block segments.
3Adaptability or versatility
If a finer granularity of segmented physical channel resources is implemented, then flexibility in systems with varying available physical channel resources is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of segmentation granularity from fixed (48 modulation symbols) to variable, allowing the number of encoded bits per code block segment to be adjusted based on available physical channel resources. The segmentation rule calculates the total encoded bits available and distributes them among code block segments using their individual bit requirements and code rates, achieving fine-grained flexibility through parameter adaptation rather than structural complexity.
Data Source
AI summary
A wireless communication transmitter (200) configured to segment a transport block into C segments, encode each segment into a set of encoded bits, determine, for γ encoded segments, a subset of size M0′ of encoded bits for each encoded segment and for C−γ encoded segments, a subset of size M1′ of encoded bits for each encoded segment, wherein the subset sizes M0′ and M1′ differ at most by P bits, where P is a product of a modulation order and a number of transmission layers over which the transport block is transmitted. The selected subsets of encoded bits are concatenated and grouped to form modulation symbols of the modulation order.