Wireless Signal Collision Detection via Null Resource Elements
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Solution Overview
Problem
Wireless communication networks face challenges in efficiently transmitting signals on shared resources due to collisions, where multiple terminals using the same radio resources interfere with each other, leading to signal interference and decoding issues.
Innovation Solution
A terminal transmits a signal on a subset of resource elements in a resource block, with at least one null resource element left unused to detect collisions, allowing for the determination of signal interference by measuring received power on these null elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminals transmit signals on shared radio resources, then network resource utilization is improved, but signal collision and interference occur
Solution Approach 1:
The resource block is segmented into multiple resource elements, with at least one designated as a null resource element. This segmentation allows the system to divide the transmission resources into active signaling elements and detection elements, enabling collision detection while maintaining resource utilization.
Solution Approach 2:
The null resource element acts as an intermediary for collision detection. By leaving certain resource elements unused (null), the system creates a detection mechanism that can identify collisions without the null elements themselves carrying signal data, thus mediating between transmission and detection needs.
2Productivity
If all resource elements are used for signal transmission, then transmission efficiency is improved, but collision detection capability is lost
Solution Approach 1:
The resource block is divided into active resource elements for signal transmission and null resource elements for collision detection. This segmentation maintains high transmission efficiency by utilizing most resource elements while dedicating at least one to detection purposes.
Solution Approach 2:
At least one resource element is extracted from the active signal transmission set and designated as a null resource element. This extracted element is specifically used for collision detection, separating the detection function from the transmission function while maintaining overall system efficiency.
3Reliability
If null resource elements are used for collision detection, then collision detection capability is improved, but available transmission resources are reduced
Solution Approach 1:
Instead of using all resource elements for transmission, the system uses a subset (all except at least one null element) for active transmission. This partial action approach ensures collision detection capability while maintaining sufficient transmission resources for effective communication.
Data Source
Figure 1
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Figure 4A~4C
AI summary
Techniques for transmitting signals on shared resources in a manner to detect and/or combat collision are described. In an aspect, a terminal may transmit a signal on a subset of resource elements in a resource block, and at least one null resource element with no signal may be used to detect for collision of the signal. In another aspect, different terminals may simultaneously transmit their signals on different subsets of resource elements in a resource block. These different subsets of resource elements may be pseudo-randomly selected to randomize interference. In one design, a terminal may determine a resource block to use for transmission of a signal, select a subset of the resource elements in the resource block, and transmit the signal on the selected resource elements, e.g., to at least one other terminal for peer-to-peer communication. The signal may be a peer discovery signal, a paging signal, etc.