Wireless Reservation Signal Overlap via Interference Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional U-LTE networks only allow one network element to reserve a channel, limiting the capacity for multiple network elements to transmit reservation signals simultaneously, which restricts the efficient use of unlicensed spectrum resources.
Innovation Solution
The method allows multiple network elements to transmit reservation signals overlapping in the time domain, with interference cancellation to remove sensed signals, enabling simultaneous channel reservation and data transmission by multiple nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple network elements transmit reservation signals simultaneously in the same time domain, then the reuse factor of unlicensed spectrum resources increases and network capacity improves, but signal interference between simultaneous transmissions increases
Solution Approach 1:
The patent segments the unlicensed spectrum resources by dividing frequency subcarriers into different sets (first set and second set) that are orthogonal to each other. Each network element is assigned a specific set of frequency subcarriers for reservation signal transmission, allowing simultaneous transmissions without interference. This frequency-domain segmentation enables multiple network elements to transmit reservation signals at the same time while maintaining signal integrity.
Solution Approach 2:
The patent transitions from time-division multiplexing (where only one network element could transmit at a time) to frequency-division multiplexing by utilizing orthogonal frequency subcarriers. This dimensional change from time to frequency domain allows multiple network elements to transmit reservation signals simultaneously in the time domain while being separated in the frequency domain, thereby increasing network capacity without causing harmful interference.
2Measurement precision
If conventional carrier sensing is used to detect channel occupancy, then channel access control is maintained, but the ability to detect overlapping reservation signals from multiple network elements is limited
Solution Approach 1:
The patent applies local quality by assigning different frequency subcarrier sets to different network elements. Each network element performs carrier sensing only on its assigned orthogonal frequency subcarriers, not across the entire spectrum. This localized sensing approach allows accurate detection of channel occupancy on specific frequency resources while enabling coexistence with other network elements transmitting on different frequency subcarriers simultaneously.
Data Source
AI summary
A network and method for wireless communications are provided. A first network element in the network may transmit a first reservation signal to reserve a channel. The first reservation signal may at least partially overlap a second reservation signal transmitted by a second network element for channel reservation. The first network element and the second network element share the same channel. The first network element may also perform interference cancellation to cancel the second reservation signal transmitted by the second network element for carrier sensing.