IMS Bearer Selection for Stable Cellular Service Establishment
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Solution Overview
Problem
User equipment devices in cellular networks face issues with establishing Internet Protocol Multimedia Subsystem (IMS) services due to the radio access network failing to configure dedicated data radio bearers or appropriate quality of service (QoS), leading to no-sound issues and service drops.
Innovation Solution
The UE device selectively transmits service packets over either a dedicated or default data radio bearer based on preconditions, including QoS configurations, and manages timers to prevent service release when preconditions are not met, enabling continued IMS service operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RAN configures a dedicated data radio bearer for IMS service, then QoS requirements are met, but device complexity and configuration overhead increase
Solution Approach 1:
The UE autonomously determines whether to use a dedicated DRB or default DRB for IMS service packets based on receiving a bearer indication message from the network. This self-service approach allows the UE to adapt to network configurations without requiring complex manual configuration, resolving the contradiction by enabling reliable QoS satisfaction through automated bearer selection while keeping configuration complexity manageable.
Solution Approach 2:
The network sends a bearer indication message to the UE in advance before the UE initiates IMS service packet transmission. This preliminary action informs the UE about the appropriate bearer type (dedicated or default) to use, allowing the UE to prepare the correct transmission path beforehand. This resolves the contradiction by ensuring QoS requirements are met through advance bearer specification while avoiding complex real-time configuration decisions.
2Ease of operation
If the RAN fails to configure appropriate QoS for IMS service, then service establishment is simpler, but service reliability deteriorates causing no-sound issues and service drops
Solution Approach 1:
The UE autonomously adapts to the network's bearer configuration by determining whether to use a dedicated DRB or default DRB based on the bearer indication message received. This self-service mechanism allows the service establishment process to remain simple from the network side while the UE automatically adjusts its transmission behavior to ensure service reliability, preventing no-sound issues and service drops without requiring complex network configuration.
3Reliability
If the UE waits for dedicated bearer configuration before transmitting IMS packets, then QoS is ensured, but service establishment time increases
Solution Approach 1:
The network performs the bearer indication action in advance by sending a bearer indication message to the UE before the UE initiates IMS service packet transmission. This preliminary action provides the UE with the necessary bearer type information upfront, eliminating the need for the UE to wait for dedicated bearer configuration while still ensuring QoS requirements are met. The contradiction is resolved by shifting the bearer determination action to occur earlier in the process.
4Productivity
If the UE uses a default data radio bearer for IMS service packets, then service establishment is faster, but QoS requirements may not be met
Solution Approach 1:
The UE dynamically selects between using a dedicated DRB or a default DRB for transmitting IMS service packets based on the bearer indication message received from the network. This dynamic adaptation allows the system to optimize for speed by using default bearers when appropriate while ensuring QoS requirements are met by switching to dedicated bearers when needed. The contradiction is resolved by making the bearer selection flexible and context-dependent rather than fixed.
Data Source
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AI summary
A user equipment (UE) device (102) of a wireless communication system (100) is configured to establish an Internet Protocol Multimedia Subsystem (IMS) service (706). The UE device (102) initiates an IMS service (706) with an IMS network (126). Responsive to initiating the IMS service (126), the UE device (102) sends a message to the IMS network (126) specifying one or more preconditions for establishing the IMS service (706). The UE device (102) selectively transmits one or more service packets (728) for the IMS service (706) over either a dedicated data radio bearer (730) configured for the IMS service (706) or a default data radio bearer (708) based 10 on whether at least one of the one or more preconditions has not been satisfied.