Uplink Data Transmission Bandwidth Mismatch Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems employing New Radio (NR) technology on unlicensed carriers, inconsistencies between channel detection bandwidth and data transmission bandwidth can lead to inefficiencies and increased time delays in uplink data transmission, particularly when the channel detection bandwidth is less than the data transmission bandwidth.
Innovation Solution
A data transmission method that involves a terminal device receiving scheduling information from a network device, performing rate matching on transport blocks, and determining an uplink transmission mode to transmit data through either all or part of the available time-frequency resources, based on channel detection results, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If channel detection bandwidth is reduced to match terminal device capabilities, then device complexity is reduced, but frequency spectrum resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments the bandwidth into two distinct parts: channel detection bandwidth (first bandwidth) and data transmission bandwidth (second bandwidth). The terminal device performs channel detection on the first bandwidth while data transmission can utilize the larger second bandwidth, allowing the device to handle limited detection complexity while the network optimizes overall spectrum utilization through the broader transmission bandwidth.
2Productivity
If channel detection bandwidth is increased to match data transmission bandwidth, then frequency spectrum resource utilization efficiency is improved, but time delay increases due to longer detection time
Solution Approach 1:
The patent divides the bandwidth usage into two stages: channel detection stage using the first (smaller) bandwidth, and data transmission stage using the second (larger) bandwidth. This segmentation allows rapid channel access detection without the time penalty of scanning the entire transmission bandwidth, thereby reducing transmission time delay while maintaining efficient spectrum utilization.
3Productivity
If channel detection bandwidth is increased to match data transmission bandwidth, then frequency spectrum resource utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments bandwidth responsibilities between detection and transmission functions. The terminal device is responsible for detecting channels in the first bandwidth, while the network device manages the broader second bandwidth for transmission. This segmentation allows efficient spectrum utilization without requiring the terminal device to handle the complexity of managing the entire transmission bandwidth.
4Productivity
If terminal device transmits data through all time-frequency resources, then frequency spectrum resource utilization efficiency is improved, but reliability deteriorates when channel detection bandwidth is inconsistent with data transmission bandwidth
Solution Approach 1:
The patent introduces dynamic transmission modes that adapt to channel detection results. The network device can switch between first transmission mode (using all time-frequency resources) and second transmission mode (using only a first portion of resources) based on whether the channel is successfully detected. This dynamic adaptation ensures reliable transmission by adjusting resource usage to match actual channel conditions.
Data Source
AI summary
Provided in embodiments of the present application are a data transmission method, a terminal device and a network device, through which uplink data transmission can be performed when the channel detection bandwidth is inconsistent with the carrier bandwidth or the data transmission bandwidth of the system, thereby improving utilization efficiency for frequency spectrum resources of an unlicensed frequency spectrum. The method includes: receiving, by a terminal device, scheduling information transmitted by a network device; performing, by the terminal device, rate matching on the first transport block to obtain first data; determining, by the terminal device, an uplink transmission mode; and performing, by the terminal device, channel detection on the first carrier, and transmitting, according to a detection result and the uplink transmission mode, the first data to the network device through the first time-frequency resources.