RRC State Mismatch Handling in Wireless Communication Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, state mismatches between user equipment (UE) and base stations lead to incorrect communication, degrading the performance of both UE and base station due to differing understandings of operational states.
Innovation Solution
A communication device with a processing circuit and storage device that manages state transitions by receiving and sending specific RRC messages to align with network configurations, entering appropriate RRC and MM states, and initiating resume procedures to maintain connection and handle state mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE operates in RRC_CONNECTED state while the BS determines the UE is in MM-CONNECTED state, then communication can proceed normally, but state mismatch may occur causing incorrect communication and performance degradation
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors paging messages from the network and provides feedback about its actual state. When the UE detects it is in RRC_CONNECTED state but receives paging messages indicating MM-IDLE state, it sends feedback to the network to correct the state mismatch, ensuring both sides have consistent state information.
Solution Approach 2:
The patent uses paging messages as an intermediary mechanism to convey state information between the network and UE. The paging message carries temporary IDs that indicate the network's understanding of the UE's state, serving as a mediator to resolve state mismatch without requiring direct state synchronization.
2Use of energy by moving object
If the UE enters RRC_INACTIVE state to save energy, then power consumption is reduced, but connection resumption may fail due to cell reselection or barred cells
Solution Approach 1:
The patent applies preliminary action by having the UE store resume configuration information and temporary IDs before entering RRC_INACTIVE state. This pre-prepared information allows the UE to quickly resume connection without needing to re-establish the entire connection, reducing both power consumption and resumption failure risk.
Solution Approach 2:
The patent implements beforehand cushioning by preparing multiple resume configurations and monitoring cell conditions before attempting connection resumption. If the current cell is barred or resumption fails, the UE has pre-prepared alternative configurations to fall back on, ensuring connection reliability while maintaining energy efficiency.
3Reliability
If the UE performs cell reselection to find a better cell, then communication quality is improved, but connection resumption may fail and state mismatch occurs
Solution Approach 1:
The patent uses preliminary action by having the UE store multiple resume configurations corresponding to different cells before entering RRC_INACTIVE state. When performing cell reselection, the UE can immediately use the pre-stored configuration of the new cell to resume connection, avoiding time-consuming reconfiguration processes.
Data Source
AI summary
A communication device of handling a state mismatch comprises a storage device and a processing circuit coupled to the storage device. The storage device stores, and the processing circuit is configured to execute instructions of entering a RRC_INACTIVE state in response to a first radio resource control (RRC) message; transmitting a second RRC message to a network, when receiving a first paging message comprising a first temporary identity (ID), wherein the second RRC message is used for requesting an establishment of a connection; and transmitting a third RRC message to the network, when receiving a second paging message comprising a second temporary ID, wherein the third RRC message is used for requesting a resumption of the connection.