Base Station Resume Context Search Using RAT Information
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The limited bits in Full Resume Id or Truncated Resume Id lead to significant time consumption in searching UE context at the base station, causing delays in resuming services between the UE and the base station due to the absence of Radio Access Technology (RAT) information.
Innovation Solution
The base station retrieves RAT information from a lower layer and transmits additional identifiers and authentication information to neighboring base stations when the local identifier mismatch, allowing faster UE context retrieval by utilizing limited bits for additional context search aids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses Full Resume Id or Truncated Resume Id for UE context search, then the resume procedure can be initiated, but the search time increases significantly due to insufficient information
Solution Approach 1:
The resume identifier is segmented into different components: base station identifier, UE identifier, and RAT information. By separating these components, the base station can use the limited bits in Full/Truncated Resume Id for the most critical search function while obtaining additional RAT information from lower layers, thus reducing search time without sacrificing resume capability.
Solution Approach 2:
The patent adds a new dimension to the resume procedure by incorporating RAT information from lower layers (MAC layer or below) into the resume process. This additional dimension of information allows the base station to perform more efficient UE context search without increasing the identifier bit length, thereby resolving the time efficiency contradiction.
2Device complexity
If the base station searches UE context using limited bits in Resume Id, then the identifier can be kept compact, but the search precision and speed deteriorate
Solution Approach 1:
The identifier is segmented into functional components with different roles: base station identifier for location, UE identifier for uniqueness, and RAT information for technology type. This segmentation allows compact representation while maintaining search precision through the combined use of these segmented components.
Solution Approach 2:
RAT information acts as an intermediary element that bridges the gap between the limited resume identifier and the UE context database. By introducing this intermediary information from lower layers, the base station achieves precise UE context search without requiring a more complex identifier structure.
3Speed
If the base station transmits additional information to neighboring base stations, then the UE context can be retrieved faster, but the communication overhead increases
Solution Approach 1:
The patent extracts only the essential additional information (RAT information and necessary identifier components) from the full UE context and transmits only these extracted elements to neighboring base stations. This selective extraction enables fast UE context retrieval while minimizing communication overhead by excluding unnecessary data.
Solution Approach 2:
Instead of transmitting the complete UE context, the base station performs partial action by transmitting only the necessary additional information (RAT information and identifier components) needed for context retrieval. This partial action approach achieves sufficient speed improvement without the excessive communication overhead of full context transmission.
Data Source
AI summary
The present disclosure describes a method and a base station for efficient searching of UE context during base station resume procedure. The base station receives a resume request from a UE. The resume request comprises a base station identifier, a UE identifier, and authentication information. Subsequently, the base station retrieves a RAT information of the UE from a lower layer of the base station upon receiving the resume request. Based on at least one of the base station identifier, the UE identifier, the authentication information, and the RAT information, the base station either receives a UE context information from one of a plurality of neighbouring base stations or determines the UE context information at the base station. Thereafter, the base station establishes a connection with the UE using the UE context information.