Terminal Uplink Transmission with Conditional UCI Multiplexing
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Solution Overview
Problem
There is a need for a method and apparatus to efficiently transmit uplink signals in a wireless communication system that supports diverse services such as enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable low-latency communication (URLLC), which require different transmission/reception techniques and parameters.
Innovation Solution
The method involves transmitting a random access preamble on a physical random access channel (PRACH) and receiving a random access response (RAR) message, with the UCI not being multiplexed on the PUSCH when it overlaps with a physical UL control channel (PUCCH) scheduled by the RAR UL grant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UCI is multiplexed on PUSCH to improve resource utilization, then productivity increases, but reliability deteriorates due to potential signal overlap and interference
Solution Approach 1:
The patent extracts UCI from PUSCH when overlap with PUCCH is detected, preventing multiplexing in conflicting scenarios. This separation ensures that UCI is transmitted only on dedicated PUCCH resources when necessary, maintaining reliability while still allowing multiplexing on PUSCH when resources do not overlap, thus balancing productivity and reliability.
2Device complexity
If UCI is multiplexed on PUSCH to reduce the number of channels, then device complexity decreases, but reliability worsens due to potential transmission conflicts
Solution Approach 1:
The patent implements dynamic channel management where the multiplexing behavior adapts based on resource overlap conditions. When PUSCH and PUCCH resources overlap, the system dynamically switches to separate transmission; when they don't overlap, multiplexing is enabled. This dynamic approach reduces complexity compared to always-separate transmission while maintaining reliability through conditional logic.
3Productivity
If random access procedures are simplified to improve access speed, then productivity increases, but reliability may deteriorate due to potential resource conflicts
Solution Approach 1:
The patent employs feedback mechanisms where the terminal monitors for overlaps between PUSCH and PUCCH resources after receiving the RAR message. Based on this feedback about resource conflicts, the terminal adjusts its transmission behavior - either multiplexing UCI on PUSCH or transmitting separately on PUCCH. This feedback-driven approach enables fast random access while maintaining reliability through conflict detection and resolution.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system includes transmitting, to a base station, a random access preamble on a physical random access channel (PRACH), and receiving, from the base station, in response to the transmitted random access preamble, a random access response (RAR) message including an RAR uplink (UL) grant, wherein, in case that a physical UL shared channel (PUSCH) scheduled by the RAR UL grant overlaps with a physical UL control channel (PUCCH) carrying UL control information (UCI), the UCI is not multiplexed on the PUSCH.