Reducing Random Access Preamble Duration for Small Cell Overhead
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Solution Overview
Problem
The existing LTE system's random access preamble signals are too long, wasting resources and inefficient for small cell networks, which require improved bandwidth and performance at lower costs.
Innovation Solution
The duration of the random access preamble signal is reduced to a single SC-FDMA symbol or OFDM symbol, with optimized sequence design and resource allocation, allowing for efficient access in small cell networks without the need for uplink synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If long duration preamble signals are used to support macro cell coverage, then coverage range is improved, but air interface overhead increases and resources are wasted in small cell networks
Solution Approach 1:
The patent applies local quality by configuring different preamble signal durations for different cell types. Small cells use short duration preambles (1-3 symbols) while macro cells use long duration preambles (7-13 symbols), allowing each cell type to have optimized parameters for its specific coverage requirements and resource efficiency needs.
Solution Approach 2:
The patent changes the duration parameter of the random access preamble signal based on cell type. By configuring the number of SC-FDMA symbols to 1-3 for small cells and 7-13 for macro cells, the system optimizes both coverage range and resource efficiency for different deployment scenarios.
2Reliability
If long duration preamble signals are used to ensure reliable random access, then access reliability is improved, but system capacity and resource efficiency deteriorate
Solution Approach 1:
The patent implements local quality by applying different preamble durations to different cell types. Small cells use short preambles (1-3 symbols) to maximize capacity, while macro cells use long preambles (7-13 symbols) to ensure reliability, allowing each to operate at optimal performance points.
Solution Approach 2:
The patent changes the preamble duration parameter based on cell type requirements. Small cells are configured with 1-3 SC-FDMA symbols for high capacity, while macro cells use 7-13 symbols for high reliability, resolving the trade-off between these two objectives.
3Adaptability or versatility
If standardized preamble formats are used to maintain system compatibility, then interoperability is improved, but flexibility for small cell optimization deteriorates
Solution Approach 1:
The patent applies local quality by allowing small cells to use a subset (1-3 symbols) of the standardized preamble formats while macro cells use the full range (7-13 symbols). This maintains compatibility with existing LTE standards while enabling optimization for small cell deployments.
Solution Approach 2:
The patent achieves universality by using the same SC-FDMA symbol structure for both small and macro cells, ensuring compatibility with existing LTE infrastructure. The unified framework allows different cell types to coexist while using optimized parameters for their specific requirements.
Data Source
AI summary
The present disclosure provides a radio communication method, a user equipment, and a network side device, the radio communication method includes: receiving, by a network side device, a random access preamble signal transmitted by a user equipment, where duration of the random access preamble signal is one SC-FDMA symbol or one OFDM symbol, thus air interface overhead of random access can be greatly reduced in a condition that a user equipment can access a cell randomly. The cell may be a microcell or other similar cells.