RRC Suspension State Initialization for Radio Communication Reliability
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Solution Overview
Problem
Transitions between RRC-Connected and RRC-Suspended states in LTE communication systems can lead to state disagreements in intermediate layers, causing communication failures due to unclear operations in the MAC, RLC, and PDCP layers, resulting in potential data transmission and reception issues.
Innovation Solution
A radio communication device and method that includes a state controlling unit and an interruption processing unit, which control the RRC layer to transition between connected and suspended states, and initialize intermediate layer states to ensure consistent state resumption, preventing communication failures by aligning the states of the UE and eNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UE transitions between RRC-Connected and RRC-Suspended states to reduce signaling, then signaling amount is reduced, but state disagreement in intermediate layers occurs causing communication failures
Solution Approach 1:
The patent applies preliminary action by having the interruption processing unit initialize intermediate layer states before the RRC layer transitions to suspended state. This preliminary initialization ensures that when the UE resumes to connected state, the intermediate layers are already in a consistent state, preventing state disagreement and communication failures while maintaining the benefits of RRC suspension for reducing signaling.
2Productivity
If the RRC layer transitions to suspended state to reduce signaling, then connection efficiency is improved, but unclear operations in intermediate layers cause state disagreement
Solution Approach 1:
The interruption processing unit performs preliminary initialization of intermediate layer states before the RRC suspension transition. This ensures that the intermediate layers (MAC, RLC, PDCP) have well-defined operations and states ready for resumption, making the overall operation clear and predictable while maintaining connection efficiency through RRC suspension.
Solution Approach 2:
The interruption processing unit acts as an intermediary mechanism between the RRC layer transition and the intermediate layers. It mediates the state changes by explicitly initializing intermediate layer states based on the RRC layer transition, ensuring clear operation flow and preventing state disagreement while enabling efficient RRC suspension.
3Device complexity
If intermediate layer states are not initialized during RRC suspension, then processing complexity is reduced, but communication cannot start normally due to state disagreement
Solution Approach 1:
The patent applies local quality by selectively initializing only the necessary intermediate layer states (MAC, RLC, PDCP) during RRC suspension, rather than initializing all possible states. This targeted approach maintains communication startup reliability by ensuring critical states are consistent while avoiding unnecessary processing complexity in unused areas.
Data Source
AI summary
To provide a radio communication device and a radio communication method that can surely avoid a state that communication cannot be started because of a disagreement in states in an intermediate layer, which is lower to RRC layer, when transitioning between a connected state (RRC-Connected) and a suspended state (RRC-Suspended) in the RRC layer. UE (100) includes a state controlling unit (120) that controls the RRC layer to be in the connected state or the suspended state, and an interruption processing unit (130) that initializes at least a part of states in the intermediate layer, specifically MAC layer/RLC layer/PDCP layer, after the RRC layer has transitioned from the connected state to the suspended state. The state controlling unit (120) causes the RRC layer to resume from the suspended state to the connected state based on the state of the intermediate layer initialized by the interruption processing unit (130).