Terminal RRC Cause Value Mapping for Multi-Core Network Access
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Solution Overview
Problem
When a terminal accesses different core networks using a single radio access technology, it faces challenges in successfully reporting cause values due to incompatible message formats and limited field lengths in existing RRC requests, leading to exceptions and inadequate service support for diverse core networks.
Innovation Solution
The terminal determines a first cause value based on access information, including access identity and category, and maps it to a compatible format using a protocol layer, ensuring that cause values can be carried in a message format defined by the same radio access technology, allowing successful reporting across multiple core networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal uses a single message format for multiple core networks, then the message format compatibility is improved, but the ability to accurately represent different cause values for different core networks deteriorates
Solution Approach 1:
The patent applies parameter changes by mapping cause values from different core networks (EPS and 5GS) to a unified set of cause value parameters that are compatible with the NR RRC message format. This involves transforming the cause value parameters while preserving the essential information about the access cause, thereby resolving the contradiction between format compatibility and information accuracy.
Solution Approach 2:
The patent introduces an intermediary mapping mechanism that acts as a bridge between the diverse cause value systems of different core networks and the unified NR RRC message format. This intermediary layer performs the cause value determination and mapping, ensuring that information is not lost while achieving format compatibility.
2Adaptability or versatility
If the terminal reports detailed cause values for different core networks, then the service differentiation is improved, but the message complexity increases
Solution Approach 1:
The patent changes the cause value parameters to a unified set that maintains service differentiation capabilities while conforming to the NR RRC message structure. By mapping different cause values from EPS and 5GS to appropriate NR cause value parameters, the patent achieves service differentiation without increasing message complexity.
Solution Approach 2:
The patent creates a universal cause value representation that serves multiple core networks (EPS and 5GS) through a single message format. This multi-functional approach allows the same message structure to differentiate services across different network types without requiring separate message formats for each network.
3Adaptability or versatility
If the terminal adapts cause values to conform to specific radio access technology formats, then the network compatibility is improved, but the processing complexity increases
Solution Approach 1:
The patent performs preliminary action by determining and mapping the cause value before the RRC message is constructed and sent. The terminal proactively adapts the cause value to the target radio access technology format in advance, which simplifies the overall processing by avoiding complex real-time transformations during message transmission.
Solution Approach 2:
The patent applies parameter changes to transform cause values from different source formats (EPS, 5GS) into the target NR RRC format. This parameter transformation is performed systematically according to predefined mapping rules, achieving network compatibility through structured parameter adaptation rather than complex processing.
Data Source
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AI summary
This application provides a communication method and a communications apparatus. The method includes: first determining, by a terminal, a first radio access technology for establishing an RRC connection; and then determining, by the terminal based on access information, a first cause value for establishing the RRC connection, where the first cause value is a cause value of the first radio access technology, and the access information includes at least one of an access identity AI, an access category AC, or a second cause value of a second radio access technology. After the terminal determines the first cause value, the terminal sends a first message used to establish the RRC connection, and uses the first message to carry the first cause value. By using this method, when the terminal accesses a plurality of core networks by using one radio access technology, the terminal can successfully report a cause value.