Orthogonal Carrier Overlap for Spectrum Utilization
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Solution Overview
Problem
Existing communication technologies face inefficiencies in utilizing spectrum resources, leading to wasted bandwidth when multiple carriers require a total bandwidth greater than the available spectrum, as they often need to be reduced to fit within the limited bandwidth, resulting in unused frequency bands and suboptimal spectrum utilization.
Innovation Solution
A signal transmission apparatus and method that allows multiple carriers to overlap orthogonally within a shared spectrum, enabling adjustment of the bandwidth of the overlapping spectrum to accommodate more carriers, thereby eliminating unused frequency bands and improving resource utilization. This is achieved through orthogonal subcarriers and the use of guard bands or fundamental channels, which also reduces interference and ensures demodulation performance by using cross-carrier scheduling and demodulation reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple carriers are configured sequentially on a spectrum, then spectrum resources can be fully used, but when the total bandwidth required exceeds the available bandwidth, carriers must be reduced, resulting in unused frequency bands and spectrum resource waste
Solution Approach 1:
The patent applies frequency division multiplexing to arrange carriers in the frequency dimension, allowing overlapping carriers to be multiplexed by assigning different subcarrier sets. This enables more carriers to be configured on limited spectrum by utilizing the frequency dimension effectively, resolving the contradiction between carrying more carriers and avoiding spectrum waste
Solution Approach 2:
The patent segments carriers into different subcarrier sets, where each carrier is divided into multiple subcarriers. By assigning different subcarrier sets to different carriers, the system allows spectral overlap while maintaining orthogonality through subcarrier segmentation, enabling full spectrum utilization without carrier reduction
2Reliability
If carriers are reduced to fit within available bandwidth, then bandwidth constraints are satisfied, but frequency bands are left unused, causing spectrum resource waste
Solution Approach 1:
The patent resolves the bandwidth constraint issue by transitioning to frequency dimension multiplexing. Carriers can overlap in the time-frequency plane but are separated through orthogonal subcarrier assignment. This allows the system to satisfy bandwidth constraints while maintaining high spectrum utilization by configuring the maximum number of carriers possible
3Quantity of substance
If multiple carriers overlap in spectrum, then more carriers can be accommodated, but interference between carriers increases
Solution Approach 1:
The patent segments each carrier into multiple orthogonal subcarriers and assigns different subcarrier sets to different carriers. This segmentation ensures that even when carriers overlap in the spectrum, they do not interfere with each other because their subcarriers are orthogonal. The resource allocation unit configures different quantities of subcarriers for different carriers based on channel conditions, further optimizing performance while preventing interference
Data Source
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AI summary
Embodiments of the present invention disclose a signal transmission apparatus and method, and a wireless access node, and relate to the field of communications technologies, so as to resolve a problem that a spectrum cannot be fully used. The method of the present invention includes: obtaining, by a wireless access node, configuration information, where the configuration information is used by the wireless access node to transmit a signal of a second carrier in coverage space of a first carrier, a spectrum occupied by the first carrier and a spectrum occupied by the second carrier overlap, and a subcarrier of the first carrier and a subcarrier of the second carrier are orthogonal; and transmitting, by the wireless access node, the signal of the second carrier according to the configuration information. The present invention is applicable to a scenario in which a signal of a carrier is transmitted in coverage space of another carrier.