Wireless Resume Context Transfer for Base Station Handover
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Solution Overview
Problem
In wireless communication networks, when a terminal suspends its connection at a first base station and moves to a second base station within the same core network coverage, the second base station lacks the necessary context information to encrypt downlink data, leading to inefficiencies and increased signaling overhead due to the need to transmit context information to multiple base stations.
Innovation Solution
A method where the first base station allocates a ResumeID and security information to the terminal, which is passed to the core network, and during subsequent paging processes, the core network carries this information to the second base station, enabling the second base station to retrieve the terminal's context information directly from the first base station using existing inter-base station procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second base station requests context information from the core network during paging, then the terminal can be located and data can be transmitted, but signaling overhead increases and data transmission efficiency decreases
Solution Approach 1:
The first base station performs preliminary action by storing the terminal's context information (security keys, user data) locally during the initial connection. When the terminal suspends and moves to the second base station, this pre-stored context is immediately available through the ResumeID mechanism, eliminating the need for the second base station to request context from the core network and thus avoiding increased signaling overhead.
Solution Approach 2:
The ResumeID acts as an intermediary element that links the terminal's suspended connection state at the first base station with the active connection at the second base station. This intermediary allows the second base station to directly access the terminal's context information without involving the core network in the context retrieval process, thereby maintaining data transmission efficiency while ensuring reliable terminal location.
2Adaptability or versatility
If context information is transmitted to multiple base stations, then the terminal can be served across different cells, but signaling overhead increases
Solution Approach 1:
The invention extracts only the essential context information (security keys and user data) from the full terminal profile and stores it locally at the first base station. When the terminal moves to the second base station, only the necessary context is retrieved through the ResumeID mechanism, rather than transmitting complete terminal profiles to multiple base stations, thus reducing signaling overhead while maintaining mobility support.
Solution Approach 2:
The first base station creates a local copy of the terminal's context information during the initial connection establishment. This copied context is maintained locally and can be quickly retrieved when the terminal resumes connection at a different base station, eliminating the need for continuous context synchronization across multiple base stations and reducing overall signaling overhead.
3Device complexity
If the second base station does not have context information, then connection setup is simplified, but data encryption cannot be performed
Solution Approach 1:
The first base station performs preliminary action by pre-storing the terminal's security keys and user data context locally during the initial connected state. When the terminal suspends and attaches to the second base station, this pre-stored context is immediately available through the ResumeID mechanism, enabling the second base station to perform data encryption without requiring complex real-time context retrieval from the core network.
Solution Approach 2:
The second base station benefits from the first base station's self-service of storing terminal context information. The context is maintained locally at the first base station and automatically made available to the second base station through the ResumeID mechanism, allowing the second base station to independently possess the necessary context information for data encryption without requiring active involvement from the core network.
Data Source
AI summary
Methods, apparatus, and systems for improving data transmission efficiency in a wireless network are described. In one example aspect, a wireless communication method includes receiving, by a signaling node, resume information in a first node that has a suspended connection with a terminal, receiving, by the signaling node, a message associated with the resume request information, from a second node, and instructing, by the signaling node, the first node to provide context information of the terminal directly to the second node.