PUSCH Bit Multiplexing for Faster LTE Uplink Processing
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Solution Overview
Problem
Current radio communication systems, particularly in LTE, lack a concrete method to effectively shorten processing time, which is essential for efficient communication.
Innovation Solution
The implementation of a terminal apparatus and base station apparatus that includes a reception unit for detecting PDCCH, a transmission unit for transmitting PUSCH with control information and a rank indicator, a coding processing unit for generating coded bits, and a channel interleaver unit that multiplexes these bits using specific procedures to optimize sequence generation, based on conditions such as search space type and RNTI usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional multiplexing methods are used for control information and data bits, then the processing procedure is simple, but the processing time cannot be sufficiently shortened
Solution Approach 1:
The patent segments the multiplexing process into distinct stages: first mapping control information bits to specific positions in a matrix, then mapping data bits to remaining positions, and finally reading out the sequence. This segmentation allows for optimized bit arrangement that reduces processing time while maintaining manageable complexity through structured procedures.
Solution Approach 2:
The patent applies preliminary action by pre-defining mapping rules and bit positions before actual multiplexing occurs. The control information bits are assigned to predetermined positions in the matrix based on their type and importance, enabling faster processing during actual transmission without requiring complex real-time decisions.
2Productivity
If control information bits are mapped flexibly based on multiple conditions, then communication efficiency is improved, but the mapping complexity increases
Solution Approach 1:
The patent applies local quality by treating different types of control information bits differently based on their specific characteristics. CSS bits, USS bits, and bits associated with different RNTI types are mapped to different positions in the matrix according to predefined rules, optimizing their respective performance characteristics while maintaining overall system efficiency.
Solution Approach 2:
The patent changes mapping parameters based on the type of control information being transmitted. Different mapping configurations are applied depending on whether the bits are CSS or USS, and depending on the RNTI type, allowing the system to adapt to different communication scenarios while following structured procedures that limit complexity growth.
Data Source
AI summary
A communication method used by a terminal apparatus includes the step of separately generating first coded bits fk of a transport block, second coded bits q0 of control information, and third coded bits q1 of a rank indicator, and multiplexing the first coded bits fk and the second coded bits q0 to generate multiplexed bits gk, and the step of multiplexing the multiplexed bits gk and the third coded bits q1 to generate a first sequence hk, wherein the position where the third coded bits q1 are mapped is given at least based on a part of a first condition, a second condition, and a third condition, the first condition is whether a search space detecting the PDCCH is a CSS or a USS, the second condition is which RNTI is used to scramble CRC parity bits attached to the DCI format, and the third condition is whether the first method or the second method is used for the first coded bits.