Uplink Carrier Selection via RSRP Thresholds in 5G Random Access
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Solution Overview
Problem
In 5G mobile communication networks, terminal devices face challenges in determining the appropriate uplink carrier for random access when a cell is configured with both supplementary uplink (SUL) and non-SUL carriers, leading to difficulties in initiating a successful random access process.
Innovation Solution
A method where a terminal device receives a radio resource control (RRC) message with a power threshold from a base station, detects the reference signal received power (RSRP) of the downlink carrier, and determines the first uplink carrier among multiple carriers based on the RSRP and the power threshold to transmit a random access preamble, ensuring reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a cell is configured with both SUL and non-SUL carriers to enhance uplink coverage, then uplink coverage is improved, but the terminal device cannot determine which uplink carrier to use for random access
Solution Approach 1:
The base station changes the parameter configuration by providing different power thresholds for SUL and non-SUL carriers through RRC messages. The terminal device compares the detected downlink RSRP with these thresholds to determine which uplink carrier to use, transforming the carrier selection from an ambiguous decision to a parameter-driven determination.
Solution Approach 2:
The base station provides feedback information (power thresholds) to the terminal device through RRC messages, enabling the terminal to make informed carrier selection decisions. This feedback mechanism allows the terminal to determine the appropriate uplink carrier based on the provided thresholds and detected signal conditions.
2Productivity
If the terminal device transmits random access preamble without accurate carrier determination, then random access can be initiated, but the success rate of random access decreases
Solution Approach 1:
The terminal device performs preliminary actions by detecting downlink RSRP and comparing it with power thresholds before initiating random access. This preliminary carrier determination ensures that the terminal selects the appropriate uplink carrier in advance, improving both the speed and success rate of random access.
Solution Approach 2:
The invention uses power threshold parameters provided by the base station to determine the appropriate uplink carrier. By changing from arbitrary carrier selection to parameter-based carrier determination, the terminal improves random access reliability while maintaining initiation speed.
Data Source
AI summary
A random access method includes: receiving, by a terminal, a radio resource control (RRC) message sent by a base station, the RRC message comprising a power threshold; detecting, by the terminal, a reference signal received power (RSRP) of a current downlink carrier; determining, by the terminal, a first uplink carrier among a plurality of uplink carriers corresponding to the base station according to the RSRP and the power threshold; and transmitting, by the terminal, a random access preamble to the base station using the first uplink carrier. The plurality of uplink carriers comprise a supplementary uplink (SUL) carrier and a non-SUL carrier.