Multi-Carrier Doppler Compensation for High-Speed Terminals
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Solution Overview
Problem
Future radio communication systems, such as 6G, face challenges in performing effective Doppler compensation for UEs moving at high speeds due to the use of higher frequencies, which current methods have not adequately addressed.
Innovation Solution
A terminal and base station implementation that performs first Doppler compensation on a reference carrier and second Doppler compensation on carriers other than the reference carrier, using a combination of UE and network-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher frequencies are used in future radio communication systems (e.g., 6G), then communication capacity and speed are improved, but Doppler compensation becomes difficult to perform accurately in high-speed moving environments
Solution Approach 1:
The patent divides the Doppler compensation task into two independent parts: network-based Doppler compensation for the reference carrier and UE-based Doppler compensation for other carriers. This segmentation allows each part to be optimized independently, with the network handling the most critical reference carrier compensation while UEs handle additional carriers autonomously, thereby maintaining accuracy across all carriers even at higher frequencies and speeds
Solution Approach 2:
The patent introduces a reference carrier as an intermediary element that enables indirect Doppler compensation. By first accurately compensating the reference carrier (which has well-defined characteristics), the system can then derive compensation parameters for other carriers through frequency offset relationships, avoiding the need for direct and difficult Doppler estimation on each carrier individually
2Device complexity
If network-based Doppler compensation is performed only on the reference carrier, then network complexity is reduced, but Doppler compensation coverage is insufficient for multiple carriers
Solution Approach 1:
The patent makes the UE perform multiple functions: it not only performs Doppler compensation for its own communications but also uses the reference carrier's compensation information to enable accurate compensation for other carriers. This multi-functionality at the UE level compensates for the limited network-based approach, extending comprehensive Doppler compensation coverage without requiring the network to handle all carriers individually
3Measurement precision
If UE-based Doppler compensation is performed on all carriers, then compensation accuracy is improved, but UE processing load increases
Solution Approach 1:
The patent applies partial action by having the UE perform Doppler compensation only on carriers other than the reference carrier, while the reference carrier's compensation is handled by the network. This partial approach reduces the UE's processing burden compared to handling all carriers independently, while still achieving comprehensive compensation through the collaborative network-UE approach
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate Doppler compensation across multiple carriers, enhancing communication speed, capacity, reliability, and latency performance in high-speed environments.
Implementation Method 1
a control section that performs, based on the information, first Doppler compensation in the reference carrier and that performs, based on the information and the first Doppler compensation, second Doppler compensation in a carrier other than the reference carrier
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives information related to a reference carrier, and a control section that performs, based on the information, first Doppler compensation in the reference carrier and that performs, based on the information and the first Doppler compensation, second Doppler compensation in a carrier other than the reference carrier. According to one aspect of the present disclosure, it is possible to appropriately perform Doppler compensation.