Multicast Broadcast Service Continuity in Idle and Inactive RRC States
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining service continuity for multicast broadcast services in idle and inactive radio resource control states, leading to disruptions and inefficiencies in data transmission.
Innovation Solution
A method is implemented where a user equipment receives measurement configuration parameters, initiates a random access process to request MBS configuration parameters, and maintains service continuity by receiving MBS data while in an RRC idle or inactive state, ensuring seamless data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions to RRC connected state to receive MBS data, then service continuity is maintained, but power consumption increases and state transition overhead occurs
Solution Approach 1:
The network performs MBS configuration preparation and sends measurement configuration parameters to the UE in advance while the UE is in idle or inactive state. This preliminary action allows the UE to receive MBS data without transitioning to connected state, thereby maintaining service continuity while avoiding the power consumption and signaling overhead associated with state transitions.
2Use of energy by moving object
If the UE remains in RRC idle or inactive state to save power, then power consumption is reduced, but service continuity for MBS is disrupted
Solution Approach 1:
The network acts as an intermediary by sending measurement configuration parameters and MBS configuration parameters to the UE while it remains in idle or inactive state. The UE uses these parameters to receive MBS data directly in the idle/inactive state through the random access procedure, serving as a mediator that enables service continuity without requiring state transition.
3Reliability
If the UE requests MBS configuration parameters via random access process, then MBS service continuity is maintained, but signaling overhead increases
Solution Approach 1:
The measurement configuration parameters and MBS configuration parameters are combined and sent together in a single broadcast message or system information block. This merging reduces the number of separate signaling interactions required, thereby maintaining service continuity while minimizing signaling overhead and protocol complexity.
Data Source
AI summary
A system, method and apparatus for mobile communications are provided. A user equipment (UE) in a radio resource control state receives a broadcast message that includes measurement configuration parameters. The UE determines, based on the measurement configuration parameters, a service continuity trigger for one or more multicast broadcast services (MBS) services. Responsive to the determined service continuity trigger, a random access process (RAP) is initiated, wherein initiating the RAP includes transmitting a first message indicating a request for MBS configuration parameters associated with the one or more MBS services. The UE receives the one or more MBS configuration parameters in response to transmitting the first message. The UE then receives data associated with the one or more MBS services via the target cell based on the MBS configuration parameters and while remaining in the RRC state.