Wireless Paging Parameters for UE State and Last-Cell Consistency
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Solution Overview
Problem
Paging failures in wireless communication networks due to inconsistencies in last cell records and UE states, leading to increased power consumption in devices like NB-IoT and eMTC, are not adequately addressed by existing technologies.
Innovation Solution
Implementing methods to ensure consistent last cell records and UE states by modifying paging messages and introducing indicators for last cell information and forced operations, such as forced UE context suspend and release, to align UE and core network records, and coordinating DRX/eDRX cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional paging methods are used without considering last cell record consistency, then the paging process is simple, but paging failure rate increases due to UE state inconsistencies
Solution Approach 1:
The patent applies preliminary action by checking consistency between last cell records and UE states before sending paging messages. The network element performs verification of whether the UE is in the expected cell and whether the UE state matches the network record, and only proceeds with paging if consistency is confirmed. This prevents paging failures caused by state inconsistencies without adding complex retry mechanisms or additional signaling structures.
2Reliability
If UE continuously monitors for paging messages, then paging delivery is reliable, but power consumption increases significantly
Solution Approach 1:
The patent implements feedback by having the UE send an indication message to the network element confirming whether it is in the last cell or has moved to a different cell. This feedback allows the network to update its records and determine whether to send paging messages. The UE only needs to monitor for paging when the network indicates it is in a paging state, rather than continuously monitoring, thereby reducing power consumption while maintaining reliable paging delivery.
3Productivity
If the network sends paging messages without verifying last cell record consistency, then signaling is efficient, but paging failures occur due to UE state mismatches
Solution Approach 1:
The patent applies preliminary action by performing consistency verification between last cell records and UE states before initiating paging. The network element checks whether the UE is in the expected cell and whether the UE state matches the network record, and only proceeds with paging if consistency is confirmed. This prevents paging failures caused by state inconsistencies without adding complex retry mechanisms or additional signaling structures.
4Reliability
If the UE sends frequent location updates to maintain accurate state information, then network has accurate UE state, but signaling overhead and power consumption increase
Solution Approach 1:
The patent applies self-service by having the UE autonomously determine whether to send location update information based on whether it is in the last cell or has moved to a different cell. The UE checks its own cell identity against the stored last cell information and only initiates signaling when necessary (i.e., when cell change is detected). This self-service approach maintains accurate UE state information in the network without requiring frequent unnecessary signaling, thereby reducing energy consumption.
Data Source
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AI summary
This disclosure above describes a method and system for reliably delivering and receiving paging message and reducing power consumption. The method includes: sending, by a first network element of a wireless communication network, a first paging message targeting a UE and comprising a first set of paging parameters to a second network element of the wireless communication network; identifying, by the first network element, a paging failure condition associated with the first paging message; and sending, by the first network element, upon the identification of the paging failure condition, a second paging message targeting the UE and comprising a second set of paging parameters different from the first set of paging parameters to the second network element.