5G Cell Service Support Indication for Terminal Access
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Solution Overview
Problem
In 5G network deployment, terminal devices often face poor user experience due to inability to access required services when moving between overlapping 4G and 5G network coverage areas, especially in scenarios where base stations provide only specific services like URLLC or mMTC, leading to service request failures.
Innovation Solution
A message sending method that includes indication information about service support for each cell or frequency, allowing terminal devices to determine if a cell or frequency supports the required service and perform cell reselection or handover to access suitable networks, thereby ensuring service availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device camps on a base station in SA network deployment mode, then the terminal device can access 5G network coverage, but the base station may not support the required service (eMBB, URLLC, or mMTC), leading to service request failure
Solution Approach 1:
The network device performs preliminary action by indicating service support information before the terminal device initiates service requests. The indication information about which services (eMBB, URLLC, mMTC) are supported is provided in advance through system information blocks, allowing the terminal device to make informed decisions about cell selection and service initiation, thereby avoiding service request failures.
Solution Approach 2:
The system implements feedback by providing service support information from the network device to the terminal device. The indication information acts as feedback that informs the terminal device about the capabilities of the serving cell, enabling the terminal device to adjust its behavior (such as selecting alternative cells or services) based on the network's actual service support status.
2Reliability
If the network device provides service support information for each cell, then the terminal device can select appropriate cells, but the message size and signaling overhead increase
Solution Approach 1:
The service support information is segmented by service type (eMBB, URLLC, mMTC) and by cell identifier. Each piece of indication information corresponds to a specific service and can be associated with specific cells or frequencies. This segmentation allows the terminal device to efficiently process only the relevant service information needed for its current requirements, reducing the effective message size processed.
Solution Approach 2:
The indication information structure is designed to be universal and multi-functional. A single indication information element can indicate support for multiple service types (eMBB, URLLC, mMTC) simultaneously, and the same information structure can be applied to both cell selection and frequency selection scenarios. This multi-functionality reduces the overall signaling overhead compared to having separate indications for each service and each cell.
Data Source
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AI summary
This application relates to a message sending method, a message receiving method, and a device. The message sending method includes: generating a first message, where the first message includes K pieces of indication information, the K pieces of indication information correspond to M pieces of first information, each of the K pieces of indication information corresponds to one or more services, and is used to indicate whether one of the M pieces of first information supports the one or more services, the first information is cell information or frequency information, M is a positive integer, and K is an integer greater than or equal to M; and sending the first message in a first cell. Therefore, a terminal device may select to access a cell or a frequency that can provide a service required by the terminal device, so that the terminal device can work normally, and user experience is improved. For a network device, because the provided service can be used by the terminal device, resource utilization is also improved.