Adaptive DRX Mode Selection for Paging Synchronization
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Solution Overview
Problem
In wireless communication systems, the uncertainty about whether to use extended or regular DRX parameters for paging procedures leads to asynchronous operations between user equipment (UE) and the network, potentially delaying emergency bearer services like emergency call reestablishment.
Innovation Solution
The method involves transmitting and receiving specific Non-Access Stratum (NAS) messages with different time intervals for monitoring paging occasions, allowing the UE and network to synchronize their DRX modes based on the status of the packet data network (PDN) connection for emergency bearer services, using longer intervals when the connection is not established and shorter intervals when it is.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE uses extended DRX parameter to monitor paging channel, then the power consumption is reduced and battery life is extended, but the emergency bearer service reestablishment may be delayed due to asynchronous operation with the network
Solution Approach 1:
The patent applies dynamics by making the DRX parameter adaptive rather than fixed. The UE dynamically switches between extended DRX and regular DRX parameters based on the establishment status of the PDN connection for emergency bearer service. When the PDN connection is established, the UE uses regular DRX parameter to reduce latency; when not established, it uses extended DRX parameter to save power. This dynamic adaptation resolves the contradiction between power consumption and service reestablishment time.
Solution Approach 2:
The patent changes the DRX parameter value based on the PDN connection status. The UE monitors whether the PDN connection for emergency bearer service is established and accordingly selects different DRX parameters (extended or regular) for paging channel monitoring. This parameter change mechanism allows the system to optimize between power efficiency and service recovery speed depending on the current connection state.
2Use of energy by moving object
If the UE and network use different DRX parameters for paging procedure, then extended DRX can be used for power saving, but asynchronous operation occurs leading to paging procedure failure
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports the PDN connection status to the network, and the network responds with appropriate DRX parameter assignments. The UE monitors its own PDN connection state and provides this information to the network, which then configures the appropriate DRX parameter. This feedback loop ensures both UE and network use the same DRX parameter, maintaining synchronization while allowing extended DRX for power saving when appropriate.
Solution Approach 2:
The patent makes the DRX parameter selection mechanism universal by implementing it in both the UE and the network side. Both entities follow the same logic: check PDN connection status and select corresponding DRX parameter. This universal approach ensures that regardless of which side initiates the paging procedure, both parties use consistent parameters, guaranteeing synchronization and reliable paging delivery.
3Use of energy by moving object
If the UE monitors paging channel with extended DRX parameter after radio link failure, then power consumption is reduced, but the time to reestablish emergency bearer service is increased
Solution Approach 1:
The patent applies dynamics by making the DRX parameter adaptive rather than fixed. The UE dynamically switches between extended DRX and regular DRX parameters based on the establishment status of the PDN connection for emergency bearer service. When the PDN connection is established, the UE uses regular DRX parameter to reduce latency; when not established, it uses extended DRX parameter to save power. This dynamic adaptation resolves the contradiction between power consumption and service reestablishment time.
Solution Approach 2:
The patent changes the DRX parameter value based on the PDN connection status. The UE monitors whether the PDN connection for emergency bearer service is established and accordingly selects different DRX parameters (extended or regular) for paging channel monitoring. This parameter change mechanism allows the system to optimize between power efficiency and service recovery speed depending on the current connection state.
Data Source
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AI summary
A communication device of handling a paging procedure comprises instructions of transmitting a first Non Access Stratum (NAS) message comprising a first time interval for monitoring a paging occasion and a second time interval for monitoring the paging occasion to a network, wherein the second time interval is larger than the first time interval; receiving a second NAS message comprising a third time interval for monitoring the paging occasion from the network after transmitting the first NAS message, wherein the third time interval is larger than the first time interval; receiving a paging message from the network by using the third time interval, when a packet data network (PDN) connection for an emergency bearer service is not established or not establishing; and receiving the paging message from the network by using the first time interval, when the PDN connection for the emergency bearer service is established or establishing.