Position-Based Random Access for Cell-Free Interference Reduction
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Solution Overview
Problem
The conventional cell-based communication system faces challenges with inter-cell interference and requires a new random access method suitable for a cell-free system where terminals communicate with multiple Access Points (APs) or Transmission Reception Points (TRPs), necessitating a new approach to reduce interference and improve signal quality.
Innovation Solution
A random access method where terminals explicitly or implicitly convey position-related information through transmission parameters, such as sequence, time, and frequency domain resources, allowing the network side device to adjust node and beam information for improved communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell-based random access process is used, then the process is simple and follows established procedures, but it causes inter-cell interference and becomes inefficient in cell-free scenarios
Solution Approach 1:
The patent changes the fundamental parameters of the random access process by replacing cell-based identifiers with position-based identifiers. The terminal determines its position relative to the AP/TRP and uses this position information to select RACH occasions and preamble sequences, fundamentally altering how random access is initiated and processed in cell-free systems
Solution Approach 2:
Instead of the terminal selecting a cell and then accessing the network through that cell's RACH resources, the patent inverts the approach: the terminal determines its position relative to the AP/TRP and directly uses position-based RACH resource selection, bypassing the cell concept entirely and eliminating inter-cell interference mechanisms
2Reliability
If cell-based handover and reselection procedures are implemented, then network coverage is maintained through structured cell management, but the complexity of inter-cell interference management increases
Solution Approach 1:
The patent extracts and removes the cell concept from the system architecture. By eliminating cells as the fundamental organizational unit and replacing them with AP/TRPs that serve multiple terminals simultaneously without cell boundaries, the patent removes the source of inter-cell interference and the associated management complexity while maintaining continuous network coverage
3Object-affected harmful factors
If position-based random access is implemented, then inter-node interference is reduced and signal quality is improved, but the terminal and network side device must process and interpret position information
Solution Approach 1:
The terminal autonomously determines its own position relative to the AP/TRP using available measurement information and independently selects appropriate RACH resources based on this position. This self-service approach eliminates the need for the network to explicitly assign RACH resources or process complex position information, thereby reducing network side complexity while still achieving interference reduction
Data Source
AI summary
This application discloses a random access method and apparatus, a terminal, and a network side device, belonging to the field of communication technologies. The method includes: sending a random access first target message, where a transmission parameter of the first target message is associated with position related information of the terminal, or the first target message carries position related information of the terminal, where the transmission parameter of the first target message includes at least one of: sequence information of the first target message; time domain resource information of the first target message; frequency domain resource information of the first target message; and sequence information of a demodulation reference signal included in the first target message.