RRC State Switching for Reliable Low-Power Multicast Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, UEs in an RRC inactive state may incorrectly receive or decode multicast transmissions due to noise or interference, leading to reduced communication reliability and increased power consumption, as they cannot request retransmissions.
Innovation Solution
A method and apparatus for UEs to transition between RRC connected and inactive states based on an indication received in a paging message, allowing UEs to remain in the inactive state for reduced power consumption while ensuring reliable multicast reception by transitioning to the connected state when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UE remains in RRC inactive state to receive multicast transmission, then power consumption is reduced, but communication reliability deteriorates due to inability to request retransmission
Solution Approach 1:
The patent applies dynamics by enabling the UE to dynamically switch between RRC inactive and RRC connected states based on the specific requirements of the multicast transmission. The UE transitions to RRC connected state when retransmission capability is needed and returns to RRC inactive state when reliable reception is achieved, thus adapting the state to optimize both power consumption and reliability.
Solution Approach 2:
The patent changes the operational parameter of RRC state from a static configuration to a dynamic one. By modifying the state parameter based on transmission conditions (success or failure of initial reception), the system can adjust between power-saving mode (inactive state) and reliability-mode (connected state) as needed.
2Reliability
If UE transitions to RRC connected state to ensure reliable multicast reception, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by transitioning to RRC connected state only partially - specifically only when needed for retransmission or when initial reception fails. The UE does not remain in connected state continuously but activates it selectively based on transmission requirements, thus reducing overall power consumption while maintaining reliability when necessary.
Solution Approach 2:
The UE performs self-service by autonomously deciding when to transition between states based on its own reception status. The UE monitors whether it successfully received the multicast transmission and independently determines whether to request retransmission or return to inactive state, eliminating the need for continuous network control.
3Reliability
If UE is required to be in RRC connected state for multicast transmission, then communication reliability is ensured, but power consumption increases and adaptability decreases
Solution Approach 1:
The patent makes the RRC state dynamic and adaptable rather than fixed. The UE can transition between inactive and connected states based on the specific needs of each multicast transmission, allowing the system to adapt to varying conditions such as transmission success, network load, and power constraints.
Solution Approach 2:
The patent segments the RRC state management into distinct phases: initial reception phase (can be in inactive state), retransmission decision phase (may transition to connected state), and finalization phase (return to inactive state). This segmentation allows different parts of the process to occur in different states, optimizing both reliability and adaptability.
Data Source
AI summary
This disclosure provides systems, apparatus, methods, and computer-readable media that support radio resource control (RRC) state selection for multicast service reception. A user equipment (UE) may subscribe to a multicast service while in an RRC connected state and may thereafter transition to an RRC inactive state. Subsequently, a network entity may transmit an indication of whether the UE is to remain in the RRC inactive state to receive a multicast transmission associated with the multicast service or whether the UE is to transition to the RRC connected state to receive the multicast transmission. In some aspects, the indication may enable some UEs may remain in an RRC inactive state to receive a multicast transmission (which may reduce power consumption), while other UEs may transition to an RRC connected state to receive the same multicast transmission (which may increase communication reliability). Other aspects and features are also claimed and described.