PUCCH Transmission Modes for Reduced-Capability Bandwidth Limits
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Solution Overview
Problem
Reduced capability terminal devices, such as massive machine-type communications (mMTC) devices, experience degraded PUCCH transmission performance due to frequency retuning requirements when exceeding their maximum channel bandwidth capability, and interfere with normal terminal devices like enhanced mobile broadband (eMBB) devices sharing the same resource, leading to orthogonality issues and performance degradation.
Innovation Solution
Implementing various PUCCH transmission manners, including non-frequency hopping, inter-time unit frequency hopping, and intra-time unit frequency hopping, to allow reduced capability terminal devices to transmit within their bandwidth limits without retuning, and ensure orthogonal sequences are used to avoid interference with normal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reduced capability terminal device performs frequency retuning to transmit PUCCH beyond maximum channel bandwidth capability, then frequency range coverage is improved, but transmission performance degrades due to M symbol tuning duration
Solution Approach 1:
The PUCCH transmission is segmented into multiple parts: some parts are transmitted within the terminal's maximum channel bandwidth capability without frequency retuning, while other parts are transmitted after frequency retuning. This segmentation allows the terminal to maintain reliable transmission for critical parts while still achieving extended frequency range coverage.
Solution Approach 2:
The terminal performs frequency retuning in advance before transmitting PUCCH parts that require extended frequency range. By preparing the frequency tuning beforehand, the actual PUCCH transmission can proceed without interruption, improving transmission reliability while maintaining adaptability to broader frequency ranges.
2Productivity
If reduced capability terminal device and normal terminal device share same PUCCH resource, then resource utilization is improved, but orthogonality cannot be ensured causing interference
Solution Approach 1:
Different transmission characteristics are applied to different parts of the PUCCH transmission. Normal terminal devices transmit across the full frequency range, while reduced capability terminal devices transmit only within their bandwidth capability or use frequency retuning for specific parts. This local differentiation maintains orthogonality while enabling resource sharing.
Solution Approach 2:
The system dynamically adapts PUCCH transmission parameters based on terminal capability. Reduced capability terminal devices can switch between transmitting within their bandwidth limit and performing frequency retuning for extended range transmission, while normal devices maintain full-range transmission. This dynamic adaptation ensures orthogonality is maintained through proper resource allocation.
Data Source
AI summary
This application discloses a physical uplink control channel sending method, a receiving method, and a communication apparatus. The method includes: A terminal device determines a first transmission manner from a plurality of transmission manners including a first non-frequency hopping transmission manner, and sends a PUCCH to a network device in the first transmission manner. The first non-frequency hopping transmission manner is: sending the PUCCH without frequency hopping in a time unit. UCI on the PUCCH includes a first part and a second part, the first part is sent by using an orthogonal sequence whose length is L1, and the second part is sent by using an orthogonal sequence whose length is L2. The UCI is divided into two parts, and is sent without frequency hopping by using orthogonal sequences with a same length or different lengths.