Frequency Selection Method for 5G Random Access Delay Reduction
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Solution Overview
Problem
In 3G, 4G, and 5G networks, the uplink coverage is poorer than downlink coverage, leading to longer data transmission delays due to the need for configuration of master and slave service network devices, which is not suitable for high-demand services like OTT, car networking, and IoT.
Innovation Solution
A frequency selection method where a network side device determines and broadcasts a band set including uplink and downlink frequency ranges, allowing terminals to determine accessible frequencies, thereby bypassing the need for master and slave device configuration, reducing data transmission delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier aggregation or dual connection implementation is used for high and low band cooperation, then coverage capability is improved, but configuration delay increases (20ms-50ms)
Solution Approach 1:
The network side device pre-configures and broadcasts multiple band sets (first band set, second band set, etc.) containing different uplink and downlink frequency range combinations before the terminal needs to access. The terminal can directly select from these pre-prepared band sets without requiring time-consuming configuration procedures, thus reducing configuration delay while maintaining coverage capability.
Solution Approach 2:
The patent changes the parameter representation from single band configuration to multiple band set configurations. Each band set contains different combinations of uplink and downlink frequency ranges, allowing the terminal to select the most appropriate band set based on current network conditions and service requirements, thereby reducing configuration time while maintaining reliable coverage.
2Reliability
If master and slave service network side devices are configured for terminal, then uplink coverage is improved, but data transmission delay increases
Solution Approach 1:
The network side device prepares multiple band sets with different uplink and downlink frequency range combinations in advance and broadcasts them to terminals. When a terminal needs to access the network, it can immediately select from these pre-configured band sets without waiting for master and slave device configuration procedures, thus reducing data transmission delay while maintaining improved uplink coverage.
3Productivity
If high band is used for capacity provision, then system capacity is improved, but uplink coverage capability deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into multiple band sets, where each band set contains specific combinations of uplink and downlink frequency ranges. High bands (e.g., 28 GHz, 3.5 GHz) are used in certain band sets for capacity provision, while low bands (e.g., 900 MHz) are used in other band sets for coverage enhancement. The terminal can select appropriate band sets based on whether capacity or coverage is the priority, thus resolving the contradiction between system capacity and uplink coverage capability.
Solution Approach 2:
The patent changes the frequency band parameters by providing multiple band set options with different uplink and downlink frequency range combinations. This allows the system to dynamically adjust which bands are used for capacity (high bands) and which are used for coverage (low bands) based on terminal location and service requirements, resolving the contradiction between system capacity and uplink coverage capability.
Data Source
AI summary
The present disclosure provides a frequency selection method, a random access method, and an apparatus. The method comprises: determining a first band set, the first band set comprising at least one first working band supported by a network side device, and the first working band comprising at least one uplink frequency range and at least one downlink frequency range; and broadcasting the first band set, so that the terminal determines, according to the first band set, the at least one uplink frequency range and the at least one downlink frequency range comprised in the first working band supported by the network side device.