MTC-IWF Device Local Caching for Downlink Data Routing
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Solution Overview
Problem
The existing M2M communication methods for downlink small data transmission frequently query the HLR/HSS, leading to increased signaling load and potential network congestion, especially in scenarios with high-frequency data transmission and multiple simultaneous applications.
Innovation Solution
The MTC-IWF device acquires and stores serving node information locally, reducing the need for frequent queries to the HLR/HSS by registering for association updates, allowing it to send downlink data directly to the serving node without querying the HLR/HSS for routing information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the MTC-IWF device queries the HLR/HSS for routing information each time downlink data needs to be sent, then the routing information can be obtained accurately, but the signaling load on the HLR/HSS increases greatly and network congestion may occur
Solution Approach 1:
The MTC-IWF device performs preliminary actions by querying the HLR/HSS for routing information only when the local cache is empty or stale, rather than querying every time downlink data needs to be sent. This preliminary caching approach reduces repeated signaling while ensuring routing information is obtained when needed, resolving the contradiction between routing accuracy and signaling load.
Solution Approach 2:
The MTC-IWF device creates a local copy (cache) of the routing information from the HLR/HSS and stores it locally. This copying mechanism allows the device to use the cached copy for subsequent downlink data transmissions without repeatedly querying the original HLR/HSS, thereby maintaining routing information accuracy while significantly reducing signaling load on the network.
2Quantity of substance
If the MTC-IWF device caches serving node information locally, then the signaling load on the HLR/HSS is reduced, but the probability of trigger delivery attempt failures increases when the cached information is stale
Solution Approach 1:
The MTC-IWF device implements a feedback mechanism by monitoring the freshness of cached serving node information. When the cache detects that information is stale (based on timing or validity indicators), it automatically triggers a refresh query to the HLR/HSS. This feedback loop ensures that cached information is updated before becoming unreliable, maintaining delivery success rates while keeping signaling load low.
Solution Approach 2:
The caching system dynamically adjusts its behavior based on the freshness of cached information. The device transitions between using cached data (when fresh) and querying the HLR/HSS (when stale), making the system adaptive rather than static. This dynamic approach balances the trade-off between reducing signaling load and maintaining reliable delivery by adjusting cache usage based on real-time information validity.
3Adaptability or versatility
If multiple applications run simultaneously on the UE and multiple servers send small data frequently, then the data communication functionality is enhanced, but the signaling load on the HLR/HSS increases and network congestion may be caused
Solution Approach 1:
The MTC-IWF device merges multiple downlink data requests from different servers into a single unified processing flow. Instead of each server independently querying the HLR/HSS for routing information, the device consolidates these requests and utilizes the cached routing information for all of them. This merging approach maintains full data communication functionality for multiple applications while significantly reducing the cumulative signaling load on the HLR/HSS that would otherwise cause network congestion.
Data Source
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AI summary
The present invention discloses a data downlink transmission method and a device, and belongs to the field of communications technologies. The method includes: receiving, by an MTC-IWF device, a first message sent by a server, where the first message includes downlink data that needs to be sent to a user equipment; and acquiring, by the MTC-IWF device, locally stored serving node information of the user equipment, and sending a second message to a serving node of the UE according to the serving node information of the UE, where the second message includes the downlink data that needs to be sent to the user equipment, so that the serving node sends the downlink data to the user equipment.