MBS RRC State Indication for QoS and UE Power Balance
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transitioning user equipment (UE) between RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states for multicast and broadcast services (MBS) based on quality of service (QoS) requirements, particularly in NR MBS delivery modes.
Innovation Solution
Methods and apparatuses are developed to determine and transmit indication information for UE state transitions, including MBS state indications and change indications in various messages and configurations, such as short messages, system information blocks, and MCCH, to manage RRC state changes based on QoS needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE in RRC_IDLE state or RRC_INACTIVE state enters RRC_CONNECTED state for receiving MBS session, then the QoS requirement (high reliability, low latency) can be met, but the power consumption increases and network transition overhead increases
Solution Approach 1:
The patent changes the RRC state parameter of the UE based on QoS requirements. When QoS requirement is high, the UE transitions to RRC_CONNECTED state; when QoS requirement is low, the UE remains in RRC_IDLE or RRC_INACTIVE state. This dynamic parameter change resolves the contradiction by adapting the state to the specific service requirements.
Solution Approach 2:
The patent makes the RRC state dynamic rather than static. The network can instruct the UE to transition between RRC_IDLE/RRC_INACTIVE and RRC_CONNECTED states based on the MBS session QoS requirements. This dynamic state management allows the system to optimize between power consumption and QoS performance in real-time.
2Reliability
If a UE in RRC_IDLE state or RRC_INACTIVE state enters RRC_CONNECTED state for receiving MBS session, then the QoS requirement can be met, but the network transition overhead increases
Solution Approach 1:
The patent dynamically changes the RRC state parameter based on QoS requirements. By only transitioning to RRC_CONNECTED state when high QoS is required, the system avoids unnecessary state transitions and reduces network overhead. The indication message mechanism efficiently signals the state change requirement without complex procedures.
3Ease of operation
If indication information is provided through RRC dedicated signaling, then the state transition control is precise, but the signaling overhead increases
Solution Approach 1:
The patent uses the existing group paging message structure to carry MBS state indication information, making the paging mechanism multi-functional. Instead of creating a new dedicated signaling mechanism, the solution reuses the universal group paging infrastructure to convey state transition instructions, reducing signaling overhead while maintaining control precision.
Solution Approach 2:
The patent copies the indication information into the group paging message format, reusing the existing message structure. This approach avoids duplicating signaling mechanisms and leverages the already-established paging infrastructure to deliver state transition control with minimal additional overhead.
4Use of energy by moving object
If the UE stays in RRC_IDLE state or RRC_INACTIVE state for receiving MBS session, then the power consumption is reduced, but the QoS requirement cannot be met
Solution Approach 1:
The patent dynamically adjusts the RRC state parameter based on QoS requirements. When QoS requirement is high, the system transitions the UE to RRC_CONNECTED state; when QoS requirement is low, the UE remains in power-saving states. This parameter adaptation resolves the contradiction by matching the operational state to the service requirements.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for multicast and broadcast services (MBS). According to an embodiment of the present disclosure, a method may include: determining whether a user equipment (UE) in an RRC_IDLE state or RRC_INACTIVE state should enter an RRC_CONNECTED state for reception of at least one MBS session; and transmitting indication information for indicating whether the UE should enter the RRC_CONNECTED state.