User Equipment NAS Procedure Priority Over CS Paging

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Solution Overview

Problem

In the LTE mobile communication system, there is a lack of clear guidance on how User Equipment (UE) should handle a paging message indicating a paging procedure triggered for the Circuit Switching (CS) domain when an initial Non-Access Stratum (NAS) procedure is initiated by the UE on its own initiative, leading to potential collisions between the paging procedure and the NAS procedure.

Innovation Solution

The method involves the UE ignoring the paging message and initiating the initial NAS procedure when it determines the paging procedure is triggered for the CS domain, and the network-side device handling the NAS procedure accordingly, with specific handling depending on the type of NAS procedure initiated.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE responds to the paging message for CS domain, then the paging procedure is completed, but the initially initiated NAS procedure is blocked or delayed

Engineering Contradiction:

Improvepaging procedure completionVSAvoidNAS procedure delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Instead of having the UE respond to the paging message when a NAS procedure is initiated, the patent inverts the logic by detecting the NAS procedure initiation first and using that to suppress the paging response. The UE monitors for NAS procedure initiation conditions and, upon detection, ignores the paging message for CS domain, thereby prioritizing the NAS procedure over the paging procedure.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If the UE initiates the NAS procedure independently, then the communication service is established, but collision with the paging procedure occurs

Engineering Contradiction:

Improvecommunication service establishmentVSAvoidprocedure collision

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by having the UE detect and monitor for NAS procedure initiation conditions before responding to the paging message. By detecting the intent to initiate a NAS procedure in advance and using this detection to suppress the paging response, the system prevents the collision from occurring in the first place, rather than trying to resolve it after both procedures are active.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the network side processes both paging and NAS procedures simultaneously, then both procedures are handled, but system complexity and processing overhead increase

Engineering Contradiction:

Improveprocedure handling capabilityVSAvoidprocessing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the paging response action from the normal paging procedure flow by introducing a detection mechanism that identifies when a NAS procedure is being initiated. When detected, the paging response is taken out (suppressed) and not executed, thereby simplifying the overall system processing by avoiding the need to simultaneously manage both conflicting procedures.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8849319B2Method for processing conflict of communication service procedures and associated devices

Publication Date: 2014.09.30 DATANG MOBILE COMM EQUIP CO LTD

AI summary

A method for processing a conflict of communication service procedures and associated devices are provided, which are used to solve the problem that the user equipment (UE) receiving the circuit switching (CS) domain paging message conflicts with initiating the Non-Access Stratum (NAS) procedure by itself. Said method includes that: the UE receives a first paging message from the network side equipment; when the UE judges the first paging message is a CS domain paging message and that the UE itself is about to initiate an original Non-Access Stratum (NAS) procedure, the UE ignores the first paging message and initiates the original NAS procedure.