Terminal Spectrum Reporting for 5G Uplink Scheduling
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Solution Overview
Problem
In 5G communication, the limited uplink coverage and high propagation loss of high-frequency bands in New Radio (NR) spectra lead to data transmission failures due to the network's lack of knowledge about the terminal device's supported spectrum range, especially when supplementary uplink carriers are used, causing scheduling errors.
Innovation Solution
A method where the terminal device generates and sends indication information to the network device about its supported spectrum range during the random access procedure, allowing the network to accurately determine the schedulable spectrum range and prevent data transmission failures by using a combination of high and low frequency carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency NR spectrum is used for 5G, then data rate and capacity are improved, but uplink coverage is limited due to high propagation loss
Solution Approach 1:
The patent combines high-frequency NR spectrum and low-frequency LTE spectrum into a unified communication system. The terminal device and network device exchange indication information to identify supported frequency bands, enabling the system to utilize both high-frequency capacity advantages and low-frequency coverage advantages, thereby resolving the contradiction between data rate improvement and uplink coverage limitation.
2Reliability
If supplementary uplink carrier is introduced to improve uplink coverage, then uplink coverage is improved, but the network device cannot determine the terminal's supported spectrum range leading to scheduling errors
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device sends indication information to the network device about its supported frequency bands, and the network device responds with scheduling decisions adapted to the terminal's capabilities. This feedback loop ensures that the network device has accurate information about the terminal's supported spectrum range, preventing scheduling errors while maintaining improved uplink coverage through supplementary uplink carriers.
Solution Approach 2:
The patent performs spectrum capability exchange during the random access procedure, before actual data transmission begins. The terminal device includes indication information in the random access message, allowing the network device to know the terminal's supported frequency bands in advance and make appropriate scheduling decisions, thus avoiding scheduling errors.
3Device complexity
If the network device schedules the terminal device without knowing its supported spectrum range, then resource allocation is simplified, but data transmission and reception will fail
Solution Approach 1:
The patent performs spectrum capability identification during the initial random access procedure, before resource allocation takes place. The terminal device includes indication information about its supported frequency bands in the random access message, allowing the network device to obtain this information in advance and make appropriate scheduling decisions, thus avoiding scheduling errors.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal device sends indication information to the network device about its supported frequency bands, and the network device responds with scheduling decisions adapted to the terminal's capabilities. This feedback loop ensures that the network device has accurate information about the terminal's supported spectrum range, preventing scheduling errors while maintaining improved uplink coverage through supplementary uplink carriers.
Data Source
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AI summary
Provided are a random access method, a spectrum reporting method, a terminal device, and a network device. The method comprises: a terminal device obtains a first frequency point by means of a cell search; the terminal obtains a first band supported by a network device by means of a system broadcast message; the terminal device determines, in a plurality of bands corresponding to the first frequency point, a second band supported by the terminal device; and the terminal device initiates a random access process when determining that the first band and the second band are the same. In embodiments of the present invention, when the first band and the second band are different, the terminal device reports indication information, so that the network device can accurately determine a spectrum range that the terminal device can schedule, and the accuracy of scheduling the terminal device by the network device is improved.