NR Random Access Using Polarization to Distinguish Preamble Collisions
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Solution Overview
Problem
The existing communication mechanism in the NR system faces challenges with increased user quantities, particularly in massive machine type communication scenarios, where collisions of terminal devices sending the same preamble to a network device are common, leading to inefficiencies in identifying and establishing connections.
Innovation Solution
Introduce a polarization parameter dimension in the random access process, allowing terminal devices to determine their qualification to access the network based on information received in a connection response, thereby increasing preamble capacity and improving connection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional random access mechanism is used in the NR system, then the system supports larger transmission bandwidth and higher transmission rates, but the preamble capacity remains small leading to high collision probability among terminal devices
Solution Approach 1:
The patent introduces a polarization dimension to the random access mechanism by applying different polarization modes (e.g., left-handed circular polarization and right-handed circular polarization) to preambles. This dimensional extension transforms the single-dimensional preamble identification into a multi-dimensional space, effectively doubling the preamble capacity and reducing collision probability among terminal devices.
2Quantity of substance
If more terminal devices access the network simultaneously, then the network capacity increases, but the collision probability on preambles increases and the network device cannot identify colliding terminal devices
Solution Approach 1:
By incorporating polarization mode as an additional dimension, the system can distinguish between terminal devices that would otherwise collide on the same preamble sequence. For example, two terminal devices using the same preamble ID can be differentiated by assigning them different polarization modes, thereby preserving identification information even as the number of simultaneous access attempts increases.
Solution Approach 2:
The patent changes the parameters of the preamble signal by varying polarization modes in addition to preamble sequences. This parameter expansion allows the network device to distinguish between multiple terminal devices using the same time-frequency resources, preventing information loss in high-density access scenarios.
Data Source
AI summary
The technology of this application relates to a random access method, applied to the communication field. The method includes a terminal device sends, to a network device, a first message used to establish a wireless connection, the terminal device receives, a connection response sent by the network device, where the connection response includes information about a first polarization parameter, and when accessing the network device based on the connection response, the terminal device determines, based on the information about the first polarization parameter included in the connection response, whether the terminal device is qualified to access the network device. A dimension, namely, a polarization parameter, is introduced into a random access procedure, so that a preamble capacity is increased, a problem that the network device cannot identify a colliding terminal device is alleviated, and efficiency of establishing a communication connection between the terminal device and the network device is improved.