Random Access Resource Selection for Low Latency 5G Uplink
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Solution Overview
Problem
In 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 in carrier aggregation or dual connection methods, which are not suitable for services requiring low latency.
Innovation Solution
A random access method that allows terminals to receive random access resource selection criterion information and initiate a random access request based on paired high-frequency downlink and low-frequency uplink frequency ranges, without performing carrier aggregation or dual connection configurations, by determining target random access resources from broadcasted information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier aggregation or dual connection configuration is performed to improve uplink coverage, then uplink coverage capability is improved, but data transmission delay increases due to 20ms-50ms configuration time
Solution Approach 1:
The terminal pre-determines the target uplink frequency range by measuring downlink signal quality and comparing it with threshold information before actual data transmission. This preliminary action eliminates the need for configuration procedures during data transmission, reducing delay while ensuring the selected frequency range provides adequate uplink coverage
Solution Approach 2:
The patent extracts the configuration procedure from the data transmission process. The terminal independently determines the target uplink frequency range based on pre-broadcast threshold information and downlink signal measurements, separating the coverage optimization decision from the data transmission flow, thereby eliminating configuration delay
2Productivity
If high band is used for downlink to provide capacity, then downlink capacity is improved, but uplink coverage becomes limited due to higher path loss at high frequencies
Solution Approach 1:
The patent introduces frequency dimension diversity by allowing the terminal to select from multiple uplink frequency ranges (including both high band and low band options) based on downlink signal quality. When high band downlink is used for capacity, the terminal can switch to low band uplink for better coverage, achieving frequency dimension optimization without sacrificing either capacity or coverage
Solution Approach 2:
The patent applies different frequency band qualities to different transmission directions: high band for downlink capacity and low band for uplink coverage when needed. The network broadcasts threshold information for different uplink frequency ranges, allowing the terminal to locally adapt the uplink frequency selection based on measured downlink signal quality, achieving optimal quality for each transmission direction
Data Source
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AI summary
The present disclosure provides a random access method and apparatus. The method comprises: receiving random access resource selection criterion information and random access resource information broadcasted by a network side device; determining, from the random access resource information, target random access resource information corresponding to the random access resource selection criterion information; and initiating a random access request to the network side device according to the target random access resource information.