RRC Connection Cause Value Segmentation for Public Safety Call Prioritization
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Solution Overview
Problem
Current wireless communication systems lack an effective method to differentiate between public safety calls and other calls, making it difficult for networks to provide appropriate access control and prioritize emergency communications.
Innovation Solution
The method involves using the same RRC connection establishment cause value for both public safety and non-public safety calls, with an indicator included in the RRC connection setup complete message to identify the type of call, allowing the network to differentiate and perform appropriate access control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same RRC connection establishment cause value is used for both public safety calls and other calls, then the terminal can simplify the call establishment process, but the network cannot effectively differentiate between public safety calls and other calls for appropriate access control
Solution Approach 1:
The patent segments the call identification process into two parts: the terminal uses a unified cause value for simplicity, while the network receives additional call type information through separate signaling messages (RRC Connection Setup Complete or NAS signaling). This segmentation allows the terminal to maintain ease of operation while the network gains the ability to differentiate call types for access control.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network side apparatus (base station or core network) receives additional call type information from the terminal through RRC Connection Setup Complete messages or NAS signaling messages. This intermediary allows the network to obtain call differentiation information without requiring the terminal to use complex cause values, thus resolving the contradiction between operational simplicity and information completeness.
2Reliability
If the network provides appropriate access control for public safety calls, then the reliability of emergency communication services is improved, but the device complexity increases due to additional identification mechanisms
Solution Approach 1:
The patent applies local quality by providing different levels of identification detail at different stages: the terminal uses a simple unified cause value for initial call establishment, while the network receives enhanced call type information through subsequent signaling messages. This allows the network to implement reliable access control for public safety calls without requiring the terminal to use complex identification mechanisms, thus improving reliability while limiting the increase in device complexity to network-side components.
Data Source
AI summary
Provided are an operation method of a terminal in a wireless communication system and a terminal using the method. The method comprises: transmitting a radio resource control (RRC) connection request message; receiving an RRC connection setup message in response to the RRC connection request message; and transmitting an RRC connection setup complete message in response to the RRC connection setup message, wherein the RRC connection request message uses the same RRC connection establishment cause value for a first call and a second call, and the RRC connection setup message comprises an indicator which can distinguish the first call from the second call.