Base Station Handling Temporary UE Capability for Handover
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Solution Overview
Problem
In wireless communication systems, there is a lack of effective handling for temporary user equipment (UE) capabilities, particularly when a UE experiences issues like overheating, leading to uncertainties in network configuration and handover processes between base stations.
Innovation Solution
A communication device and method that involve a base station (BS) receiving a temporary UE capability message, initiating a handover to another BS, and configuring the UE accordingly, including transmitting specific configurations and releasing temporary capabilities based on UE states (RRC_IDLE or RRC_INACTIVE) to manage UE capabilities dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network configures the UE according to temporary UE capability, then the UE can operate with reduced capability (e.g., due to overheating), but the network may not be aware of the temporary nature and duration of this capability change, leading to configuration uncertainties
Solution Approach 1:
The network performs preliminary actions by storing both the original UE capability and the temporary UE capability before handover occurs. This allows the network to have the necessary information ready in advance to handle the handover correctly, ensuring the UE can operate reliably with temporary capability while the network maintains awareness of the capability change nature.
Solution Approach 2:
The network acts as an intermediary by maintaining and managing the temporary UE capability information throughout the handover process. The network stores and retrieves the appropriate capability information (original or temporary) based on the UE's state, mediating between the UE's temporary capability change and the handover execution to prevent information loss.
2Reliability
If the network stores both original and temporary UE capabilities, then handover can be handled correctly, but the network device complexity increases
Solution Approach 1:
The network dynamically manages UE capability information by adapting its behavior based on UE state. When the UE is in connected state, the network uses temporary capability if available; when UE transitions to idle or inactive state, the network releases temporary capability and reverts to original capability. This dynamic approach ensures reliable handover while managing device complexity through state-dependent operations.
3Loss of energy
If the network releases temporary UE capability when UE enters idle or inactive state, then memory is freed, but the UE must re-transmit capability information when re-connecting
Solution Approach 1:
The UE performs self-service by autonomously determining when to indicate temporary capability changes to the network. The UE monitors its own state (e.g., overheating conditions) and independently decides when to trigger temporary capability indication, reducing the need for network-side storage and management of temporary capability information, thereby freeing network memory while maintaining efficient re-connection.
Data Source
AI summary
A first base station for handling a temporary UE capability comprises at least one storage device for storing instructions and at least one processing circuit coupled to the storage device. The at least one processing circuit is configured to execute the instructions stored in the at least one storage device. The instructions comprise receiving a UE capability from a communication device, a second BS or a core network; receiving a first message indicating a temporary UE capability from the communication device; transmitting a first configuration to the communication device according to the temporary UE capability; transmitting a Handover Request message to the second BS to initiate a handover to the second BS; and receiving a Handover Request Acknowledge message from the second BS, in response to the Handover Request message.