UE Paging Signal Reception With Context Indicator
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need to optimize the receipt of paging signals by user equipment (UE) in a radio resource control (RRC) connection suspended state to prevent unnecessary RRC connection procedures and reduce power consumption.
Innovation Solution
A method where the user equipment (UE) receives a paging message from an evolved Node B (eNB) and checks an indicator to determine if the UE context is stored. Based on this indicator, it transmits either an RRC connection-resume request or an RRC connection request message, and if not stored, discards the UE context, optimizing the RRC connection procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE always performs full RRC connection establishment procedure upon receiving paging signal, then connection reliability is ensured, but power consumption and signaling overhead increase
Solution Approach 1:
The patent applies partial action by allowing the UE to perform only a partial RRC connection procedure (using stored context) when the eNB still holds valid UE context, rather than always performing the complete connection establishment. This reduces signaling overhead and power consumption while maintaining connection reliability through conditional full establishment when needed.
Solution Approach 2:
The patent utilizes preliminary action by maintaining and storing UE context information in both the UE and eNB before the connection is actually needed. This pre-stored context enables faster connection resumption without full re-establishment, reducing power consumption while ensuring reliability through the availability of valid context information.
2Reliability
If the UE performs full RRC connection establishment procedure, then connection setup is ensured, but signaling overhead increases
Solution Approach 1:
The patent implements partial action by enabling the UE to perform a simplified connection procedure when context is available at the eNB, transmitting only essential resumption information rather than complete connection setup messages. This reduces signaling overhead while maintaining connection setup reliability through conditional full establishment when context is unavailable.
Solution Approach 2:
The patent uses copying by utilizing the stored UE context information that already exists in the eNB, avoiding the need to re-transmit all connection parameters. The eNB simply needs to retrieve and use the copied context data, significantly reducing signaling overhead while ensuring connection setup reliability.
3Loss of time
If the UE maintains context information, then connection resumption is faster, but memory usage increases
Solution Approach 1:
The patent applies partial action by maintaining only the essential UE context information needed for connection resumption (such as security parameters and bearer information) rather than storing complete connection state. This selective storage reduces memory usage while still enabling fast connection resumption when the eNB has matching context.
4Loss of time
If the eNB stores UE context, then connection resumption is enabled, but network resource usage increases
Solution Approach 1:
The patent uses preliminary action by storing UE context information in the eNB before connection resumption is needed. This pre-stored context enables rapid connection resumption without time-consuming re-establishment procedures, while the network resource usage is managed by only maintaining context for UEs that have suspended connections rather than all UEs.
Data Source
AI summary
The present disclosure provides a method for receiving a paging message, by a user equipment (UE) in a radio resource control (RRC) connection suspended state, in a wireless communication system. The method includes receiving the paging message from an evolved Node B (eNB); checking an indicator indicating whether the eNB stores a UE context, wherein the indicator is included in the paging message; and transmitting an RRC connection-resume request message or an RRC connection request message to the eNB based on the indicator.