PGW Data Handling for Terminals in Power Saving Mode
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Solution Overview
Problem
In wireless communication systems, when a UE is in Power Saving Mode (PSM), existing technologies face inefficiencies in handling downlink data, leading to unnecessary signaling and resource waste, as packets intended for the UE are either discarded or buffered without being transmitted, due to the UE's unavailability for receiving data.
Innovation Solution
A method and apparatus for a Packet Data Network-Gateway (PGW) to process data for a UE in PSM, where the PGW receives a PDN connection pause request and determines whether the UE is in PSM, allowing for the deletion or storage of downlink data based on this status, thereby preventing unnecessary signaling and resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PGW transmits downlink data to a UE in PSM, then the UE can receive data, but unnecessary signaling and resource waste occur since the UE is unavailable for receiving data
Solution Approach 1:
The PGW performs preliminary actions by receiving and processing the PDN connection pause request message before downlink data arrives. It proactively determines the UE's PSM status and pre-decides whether to delete or store downlink data, preventing unnecessary transmission attempts and signaling exchanges with unavailable UEs
Solution Approach 2:
The system implements feedback mechanisms where the PGW receives status information about UE PSM state through the PDN connection pause request message. This feedback enables the PGW to adapt its data handling behavior dynamically, choosing to delete or store data based on the UE's actual availability status
2Loss of energy
If the PGW deletes downlink data when UE is in PSM, then network resources are saved, but data may be lost if UE exits PSM early
Solution Approach 1:
The invention changes the state parameter of downlink data from a single binary state (transmit/delete) to a multi-state system (delete/store/transmit). The PGW adjusts the data handling parameter based on the PSM status parameter extracted from the PDN connection pause request message, enabling flexible adaptation to different UE availability scenarios
Solution Approach 2:
The PDN connection pause request message acts as an intermediary carrier that conveys UE PSM status information from the network to the PGW. This intermediary message enables the PGW to make informed decisions about data handling without directly querying the UE, resolving the contradiction between resource conservation and data preservation
3Reliability
If the PGW stores downlink data when UE is in PSM, then data can be transmitted when UE exits PSM, but network resources and storage capacity are consumed
Solution Approach 1:
Instead of universally storing all downlink data for all UEs in PSM, the PGW applies partial action by selectively storing only those data packets where the UE's PSM termination is configured by a value smaller than a predetermined value. This partial approach balances resource consumption with data delivery reliability based on specific UE configurations
Data Source
AI summary
One embodiment of the present invention relates to a method by which a packet data network-gateway (PGW) processes data for a terminal, in a power saving mode (PSM), in a wireless communication system, the method for processing data for a terminal in PSM, comprising the steps of: receiving a message related to a PDN connection stop request; receiving downlink data which has to be transmitted to a terminal; and performing one of transmission, deletion, and storage of operations of the downlink data on the basis of the message related to the PDN connection stop request.