Base Station Information Exchange for Inactive Terminals
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Solution Overview
Problem
In LTE networks, terminals in specific states (like inactive or light connection states) face challenges in transmitting uplink and downlink information due to disconnected Uu interfaces, while maintaining S1 interface connections, making it difficult for base stations to decode and forward this information effectively.
Innovation Solution
Implementing a method where base stations use a common transmission channel to exchange uplink and downlink information, with the current serving base station decoding information received from the previous serving base station, allowing for efficient data transmission and decoding even when terminals are in specific states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Uu interface is disconnected for terminals in specific states (inactive or light connection), then the load of communication equipment is reduced and spectrum resources are improved, but the terminal cannot transmit or receive information through the air interface
Solution Approach 1:
The patent introduces a base station as an intermediary to enable information transmission for terminals in specific states. When the Uu interface is disconnected, the base station receives information intended for the terminal through the S1 interface, stores it locally, and can forward it when the terminal becomes active again, thus mediating between the disconnected air interface and the terminal's information needs
Solution Approach 2:
The patent implements preliminary action by having the base station pre-store information that may be needed by the terminal in the future. When the terminal is in an inactive state, the base station keeps receiving and buffering downlink information and uplink data in advance, so that when the terminal reactivates, the information is already available without requiring retransmission
2Reliability
If the base station stores information for terminals in specific states, then information can be transmitted when terminals become active, but the base station requires additional storage capacity and processing overhead
Solution Approach 1:
The patent applies universality by making the base station perform multiple functions: it acts as both a normal serving base station for active terminals and as an information storage/forwarding node for inactive terminals. The same base station infrastructure handles both active and inactive terminal communications, eliminating the need for separate dedicated storage systems
Solution Approach 2:
The base station performs self-service by autonomously managing the storage and forwarding of information for inactive terminals without requiring external control systems. The base station independently determines when to store information, what to store, and when to forward it, reducing system complexity and overhead
3Ease of operation
If the terminal initiates random access to communicate with the base station, then the terminal can establish connection, but the process is complex and consumes significant resources when the terminal is in specific states
Solution Approach 1:
The patent implements preliminary action by having the base station pre-establish and maintain the S1 interface connection with the core network even when the terminal is in an inactive state. This preliminary connection setup eliminates the need for the terminal to perform complex random access procedures when becoming active, as the network path is already prepared
Data Source
AI summary
Provided is an information transmission method and apparatus. The method applied to a first base station includes: acquiring related information of a terminal, where the related information is uplink information or downlink information, and includes traffic data and/or control information; sending the related information to the second base station through a common transmission channel between base stations. When the related information is uplink information, the first base station is a current serving base station of the terminal, the second base station is a previous serving base station of the terminal, and the uplink information is supplied to the second base station to be decoded. When the related information is downlink information, the second base station is the current serving base station, the first base station is the previous serving base station, and the downlink information is sent to the terminal to be decoded. Further provided is a computer storage medium.