Radio Link Recovery Using Pre-Collected Neighbor Cell Data
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Solution Overview
Problem
Wireless communication systems face inefficiencies in recovering from out-of-service events, such as radio link failures, due to time-consuming blind full band searches for available base stations.
Innovation Solution
The method involves collecting and prioritizing system information blocks (SIBs) and dedicated information from base stations during connected and idle modes to expedite cell selection upon an out-of-service event, utilizing neighbor information and dedicated signaling messages for smarter cell reselection across multiple Radio Access Technologies (RATs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access terminal performs a blind full band search for available base stations during out-of-service events, then the terminal can find available base stations, but the recovery process becomes time-consuming and inefficient
Solution Approach 1:
The patent applies preliminary action by having the access terminal collect and store neighbor cell information, system information blocks (SIBs), and dedicated signaling messages during normal connected mode operation before an out-of-service event occurs. When a radio link failure happens, the terminal can immediately utilize this pre-collected information to perform cell selection without performing a blind full band search, thereby significantly reducing outage duration while maintaining reliable recovery.
2Speed
If the access terminal collects and stores neighbor information and system information blocks during connected mode, then cell selection speed increases during recovery, but the terminal must manage additional information storage and processing requirements
Solution Approach 1:
The terminal performs preliminary collection of neighbor information, SIBs, and dedicated signaling messages during normal operation. This pre-prepared information is stored in memory and immediately available for cell selection during recovery events, achieving fast cell selection without increasing operational complexity.
Solution Approach 2:
The patent extracts and stores only the essential neighbor information and system information blocks needed for cell selection, rather than collecting all possible network parameters. This selective extraction approach reduces the information management burden while maintaining sufficient data for rapid and reliable cell selection during out-of-service events.
Data Source
AI summary
Devices and methods are provided for expedited recovery from radio link failure or the like. In one embodiment, the method involves collecting at least one optional system information block (SIB) during connected mode, wherein the at least one optional SIB comprising neighbor information. In another embodiment, the method involves storing dedicated information provided by a base station through a dedicated channel. The method generally involves using the neighbor information and/or dedicated information for cell selection, in response to the radio link failure.