Layered Preamble Groups for 5G Random Access Collision Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, the existing methods fail to effectively reduce the collision possibility and reception error rate for terminals requiring high quality of service (QoS) during random access, as they either increase the number of preambles, leading to signal correlation and quality deterioration, or operate within limited preamble resources.
Innovation Solution
The implementation of a random access technique using layered preambles, where preambles are grouped based on quality of service (QoS) levels, with CAZAC sequences and prime sequence lengths, allowing terminals to select preambles matching their QoS requirements, and configuring transmit powers and RACH occasions to minimize collisions and error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of preambles is increased to reduce collision possibility, then collision probability decreases, but signal correlation increases and signal quality deteriorates
Solution Approach 1:
The patent segments the single preamble group into multiple preamble groups (first preamble group and second preamble group), each with different cross-correlation characteristics. This segmentation allows terminals to select preambles from groups optimized for their specific QoS requirements, reducing collisions without increasing overall signal correlation across all preambles.
Solution Approach 2:
The patent applies local quality by creating different preamble groups with differentiated properties - the first preamble group has lower cross-correlation for high-QoS terminals requiring reliable detection, while the second preamble group has higher cross-correlation for low-QoS terminals. This localized optimization ensures that signal quality is maintained where it matters most (for high-QoS services) while still providing adequate coverage for all terminals.
2Device complexity
If uniform preamble resources are used for all terminals, then resource allocation is simple, but collision possibility cannot be effectively reduced for high-QoS terminals
Solution Approach 1:
The patent introduces dynamic resource allocation where terminals dynamically select from different preamble groups based on their QoS requirements. The base station dynamically assigns terminals to appropriate preamble groups, creating a flexible system that adapts to varying service quality needs without requiring complex manual configuration of individual preamble assignments.
Solution Approach 2:
The patent changes the parameter of cross-correlation by creating distinct preamble groups with different cross-correlation characteristics. This parameter differentiation allows the system to optimize collision reduction for high-QoS terminals by assigning them preambles from the first group with lower cross-correlation, while maintaining simpler resource management through group-based rather than individual-based allocation.
3Manufacturing precision
If preambles with lower cross-correlation are used for high-QoS terminals, then reception error rate decreases, but the number of available preambles is reduced
Solution Approach 1:
The patent adds a new dimension to the preamble resource structure by organizing preambles into multiple groups with different cross-correlation properties. This dimensional organization allows the system to provide low cross-correlation preambles to high-QoS terminals from the first group while simultaneously providing higher cross-correlation preambles from the second group to low-QoS terminals, effectively increasing the total number of usable preambles without compromising reception quality for critical services.
Data Source
AI summary
An operation method of a terminal in a communication system may include: receiving, from a base station, quality of service (QoS) information for preamble groups and information on preambles belonging to each of the preamble groups; selecting one preamble group from among the preamble groups based on the QoS information and a QoS of the terminal; selecting a preamble within the one preamble group based on the information on preambles belonging to each of the preamble groups; transmitting a first message including the selected preamble to the base station; and receiving, from the base station, a second message that is a response to the first message.