Paging Response Message Failure Cause Codes
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Solution Overview
Problem
In wireless communications using unlicensed spectrum, there is uncertainty regarding the availability of the physical medium for transmission, leading to inefficiencies in paging operations as the core node cannot determine the reason for paging failures, hindering effective decision-making for expanding page range.
Innovation Solution
Implementing methods and apparatus for efficient paging in unlicensed spectrum, including base station and network node features that send paging response messages with failure cause codes, allowing the network node to implement an efficient paging escalation strategy based on the reason for failure, such as unavailability of unlicensed spectrum or lack of response from the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If paging operations are performed in unlicensed spectrum, then spectrum utilization is improved, but paging reliability deteriorates due to uncertainty of physical medium availability
Solution Approach 1:
The base station sends a paging response message to the core node, providing feedback about the paging operation outcome and the reason for failure (e.g., spectrum unavailability or UE non-response). This feedback mechanism enables the core node to make informed decisions about paging escalation strategies, resolving the uncertainty about why paging failed while maintaining efficient spectrum usage in unlicensed bands.
2Device complexity
If the core node does not receive failure cause information, then signaling simplicity is maintained, but paging decision-making capability deteriorates
Solution Approach 1:
The critical failure cause information is extracted from the paging response message as a distinct element (failure cause code). This allows the core node to receive and process only the essential failure reason information without requiring complex signaling, enabling informed paging decisions while keeping the signaling structure relatively simple.
3Productivity
If paging failure is treated as a single undifferentiated event, then processing simplicity is maintained, but paging efficiency deteriorates
Solution Approach 1:
Paging failures are segmented into different types based on the failure cause code (e.g., spectrum unavailability vs. UE non-response). This segmentation allows the core node to apply different escalation strategies for different failure types, improving overall paging efficiency while managing complexity through structured classification rather than treating all failures uniformly.
Data Source
AI summary
Methods and apparatus for efficient paging in a communications system using unlicensed spectrum are described. A base station, which uses unlicensed spectrum, receives a paging request message from a network node and performs paging operations attempting to page the UE. The paging attempt may fail due to the base station being unable to transmit a paging signal to the UE because the unlicensed spectrum is currently unavailable or because the UE did not respond to a transmitted page. The base station generates and transmits a paging failure response message including a failure cause code indicating the reason that the paging attempt failed. The network node receives the paging failure response message, recovers the failure cause code, and implements a paging escalation strategy as a function of the recovered failure cause code.