Random Access Preamble Configuration for Variable Cell Sizes
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing intra-cell and inter-cell interference, particularly in uplink data transfer mechanisms, which affect channel estimation and resource allocation efficiency, especially in non-synchronous user equipment (UE) scenarios.
Innovation Solution
A method is introduced to optimize user equipment (UE)-initiated access by establishing a fixed set of preamble parameter configurations across varying cell sizes, allowing UEs to select appropriate preamble configurations based on cell size information received from the nodeB, using CAZAC sequences to maximize detection probability and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional random access preamble parameters are used across varying cell sizes, then device complexity is reduced, but detection probability decreases and interference increases in large cells
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting random access preamble parameters (such as cyclic shift values, root sequence indices, and time-frequency resources) based on cell size. The nodeB determines appropriate parameter sets for different cell sizes and signals them to UEs, allowing optimal detection performance in both small and large cells without increasing fundamental device complexity.
Solution Approach 2:
The patent implements dynamics by making preamble parameters adaptive rather than static. The system dynamically selects and signals different parameter configurations based on current cell size conditions, enabling the random access procedure to adapt to varying network scenarios while maintaining manageable device complexity through standardized adaptation mechanisms.
2Object-generated harmful factors
If cell-specific preamble parameters are signaled to all UEs, then interference management improves, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing cell-specific preamble parameters only where needed - specifically tailored to each cell's size and characteristics. Rather than universal parameters, the system delivers localized parameter sets from nodeB to UEs in that specific cell, optimizing interference management for local conditions while avoiding unnecessary signaling overhead for other cells.
Solution Approach 2:
The patent segments the preamble parameter space into cell-specific configurations. Different parameter sets are created and signaled for different cells based on their specific characteristics (particularly cell size), allowing targeted interference management in each cell without burdening the entire network with comprehensive signaling for all possible scenarios.
3Productivity
If fixed preamble parameters are used for all cell sizes, then signaling overhead is reduced, but resource allocation efficiency decreases in varying cell sizes
Solution Approach 1:
The patent uses parameter changes to optimize resource allocation for different cell sizes by adjusting preamble parameters (cyclic shifts, root sequences, time-frequency resources) according to cell dimensions. This enables efficient resource utilization in both small and large cells while maintaining reasonable signaling overhead through standardized parameter sets that are selectively applied.
Data Source
AI summary
User equipment (UE)-initiated accesses within a cellular network are optimized to account for cell size and to reduce signaling overhead. A fixed set of preamble parameter configurations for use across a complete range of cell sizes within the cellular network is established and stored within each UE. A UE located in a given cell receives a configuration number transmitted from a nodeB serving the cell, the configuration number being indicative of a size of the cell. The UE selects a preamble parameter configuration from the fixed set of preamble parameter configurations in response to the received configuration number and then transmits a preamble from the UE to the nodeB using the preamble parameter configuration indicated by the configuration number.