LTE RRC Establishment Cause Differentiation for VoLTE
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LTE systems cannot accurately distinguish between VoLTE and normal data service access attempts, leading to inadequate call connection restriction control.
Innovation Solution
A method and apparatus for establishing a radio communication channel that includes receiving configuration information from a base station and setting an establishment cause based on the presence of a specific indicator for voice service, allowing for proper differentiation between VoLTE and data service access requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the LTE system uses a generic access request message without service differentiation, then the system complexity is reduced and ease of operation is improved, but the measurement precision of access purpose and the ability to perform call connection restriction control deteriorates
Solution Approach 1:
The establishment cause field in the RRC connection request message is segmented into multiple specific values to represent different access purposes. Instead of using a single generic access request, the system divides the access reason into distinct categories such as voice service, data service, emergency call, and high priority access. This segmentation allows the network to identify the specific access purpose while maintaining a standardized message structure.
Solution Approach 2:
The patent changes the parameter values within the establishment cause field to encode different access purposes. By assigning specific enumerated values to different service types (e.g., specific values for voice vs. data services), the system enables precise identification of access intent without changing the overall message structure or increasing system complexity.
2Reliability
If the LTE system implements service-specific access control, then the quality of voice call service is improved, but the device complexity and message structure complexity increases
Solution Approach 1:
The establishment cause field serves multiple functions: it identifies the access purpose, enables appropriate network resource allocation, and triggers suitable access control policies. This single field performs what would otherwise require multiple separate mechanisms, reducing overall system complexity while enabling service-specific access control for improved voice call quality.
Solution Approach 2:
The access purpose is identified and encoded in the establishment cause field before the actual connection setup process begins. This preliminary identification allows the network to prepare appropriate resources and apply suitable access control policies in advance, improving voice call service quality without adding complex real-time decision-making mechanisms.
3Productivity
If the system uses detailed establishment cause values to differentiate services, then the productivity of call connection control is improved, but the loss of information in the message structure increases
Solution Approach 1:
The patent uses parameter changes within an existing enumerated field (establishment cause) to convey detailed service differentiation information. By assigning specific values to represent different access purposes, the system achieves high productivity in call connection control while avoiding the need for additional message fields or complex message structures that would increase information loss.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The method includes receiving a first message including configuration information from a base station, setting an establishment cause based on whether the first message includes a first indicator indicating that a use of a value indicating a voice service as the establishment cause is requested, and transmitting a second message including the establishment cause for a radio resource control (RRC) connection request.