PUSCH Bit Mapping for Lower-Latency LTE Uplink Multiplexing
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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 improving latency and efficiency in cellular communication.
Innovation Solution
The implementation of specific configurations in terminal and base station apparatuses, including optimized resource grid mapping, channel interleaving, and transmission timing strategies, to enhance communication efficiency by managing uplink and downlink data and control information transmission more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional mapping methods (frequency-first or time-first) are used for multiplexing CSI, ACK/NACK and data over PUSCH, then the multiplexing is achieved, but the processing time cannot be sufficiently shortened
Solution Approach 1:
The patent applies dynamics by making the mapping direction adaptive rather than fixed. The terminal device dynamically selects between frequency-first mapping and time-first mapping based on the actual transmission scenario, allowing the system to optimize processing time adaptively while maintaining communication efficiency under different conditions
Solution Approach 2:
The patent changes the mapping parameter (mapping direction) to resolve the contradiction. By switching between frequency-first and time-first mapping modes, the system can adjust the processing time characteristic while preserving the multiplexing function, thus improving loss of time without sacrificing productivity
2Loss of time
If processing time is shortened through optimized mapping, then latency is reduced, but the complexity of determining the optimal mapping method increases
Solution Approach 1:
The terminal device performs self-service by autonomously determining whether to apply frequency-first or time-first mapping based on its own transmission conditions and requirements. This self-determination mechanism reduces the need for complex network-side coordination while achieving optimized processing time
Solution Approach 2:
The patent establishes preliminary action by pre-defining the two mapping methods (frequency-first and time-first) and their respective适用 scenarios. The terminal device can quickly select the appropriate method based on pre-established criteria, avoiding complex real-time calculations and reducing determination complexity
Data Source
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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.