CIoT Bearer Configuration for Suspended UE Context Management
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Solution Overview
Problem
In current user plane based cellular Internet of Things (CIoT), when the Mobility Management Entity (MME) determines that resuming a suspended UE context is impossible, the base station (eNB) is required to release the suspended RRC connection, leading to unnecessary signaling and state transitions, even if maintaining the connection is necessary for a predetermined time.
Innovation Solution
The method involves configuring a bearer for user data transmission in CIoT by including a cause value indicating whether the eNB maintains the suspended UE context and providing an extended wait time, allowing the eNB to determine whether to keep the suspended context and prevent unnecessary RRC connection resumption requests from the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the eNB releases the suspended RRC connection when the MME determines that resumption is impossible, then the network follows current protocol requirements, but unnecessary signaling and state transitions occur
Solution Approach 1:
The eNB performs preliminary action by maintaining the suspended RRC connection proactively before the UE attempts resumption, based on the extended wait time indicator. This prevents unnecessary release and subsequent re-establishment signaling when the UE tries to resume within the extended wait period, thus reducing signaling overhead while maintaining protocol compliance through the extended wait time mechanism
2Loss of time
If the eNB maintains the suspended UE context, then unnecessary RRC connection resumption requests from UE are prevented, but device complexity increases
Solution Approach 1:
The eNB changes the parameter of context retention duration by introducing an extended wait time mechanism. Instead of immediately releasing the suspended context, the eNB extends the retention period based on specific criteria (data availability, UE state, network conditions). This parameter change allows the eNB to maintain contexts longer when beneficial, preventing unnecessary resumption requests, while managing complexity through defined extension conditions rather than unconditional maintenance
Data Source
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AI summary
Provided are a method, for configuring a bearer for transmission of user data in user plane-based cellular Internet of Things (CIoT) by a base station in a wireless communication system, and a device for supporting same. The base station can: receive a tracking area update (TAU) request message from a terminal; transmit to a mobility management entity (MME) a UE context resume request message comprising the TAU request message; receive from the MME a UE context resume failure message comprising a cause value; and determine whether or not a temporarily stopped UE context is to be remained on the basis of the cause value.