Radio Link Failure Recovery via Inter-Frequency System Information Pre-Access
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Solution Overview
Problem
Current radio link failure recovery methods in wireless communication devices are delayed due to contention-based random access procedures, lack support for home cells in heterogeneous networks, and fail to forward pending data, leading to data loss and prolonged reestablishment times, especially when interference from neighboring cells occurs.
Innovation Solution
The method involves detecting intra-frequency and inter-frequency neighbor base stations, determining better radio link parameters, and acquiring system information from inter-frequency neighbor base stations to enable quicker reestablishment on alternate cells, even if on different frequencies, thereby reducing delays and data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current contention-based random access procedure is used for radio link failure recovery, then the reestablishment can be performed, but significant delays occur due to contention resolution and system information acquisition
Solution Approach 1:
The patent applies preliminary action by having the wireless communication device acquire system information of inter-frequency neighbor base stations before radio link failure occurs. The device stores this information in advance, so when failure occurs, it can immediately use the pre-acquired system information for reestablishment without waiting for acquisition during the recovery process, thereby significantly reducing reestablishment delay
Solution Approach 2:
The patent introduces a mechanism where the serving base station acts as an intermediary by providing measurement configurations to the device, enabling it to identify and pre-acquire system information from suitable inter-frequency neighbor base stations. This intermediary mechanism facilitates the preliminary action without adding significant overhead
2Reliability
If the current reestablishment procedure is used, then connection recovery can be attempted, but pending data is lost and no forwarding mechanism exists
Solution Approach 1:
The patent implements feedback by having the wireless communication device report measurement information about inter-frequency neighbor base stations to the serving base station. Based on this feedback, the serving base station can identify suitable target base stations for data forwarding and initiate the forwarding process before radio link failure occurs, ensuring data is not lost during reestablishment
3Device complexity
If home cells in heterogeneous networks are not specifically supported, then the reestablishment procedure remains simple, but radio link failures involving femtocells or picocells are unrecoverable
Solution Approach 1:
The patent applies parameter changes by modifying the measurement and selection criteria to specifically account for home cells in heterogeneous networks. The device is configured to measure and identify inter-frequency neighbor base stations including femtocells and picocells, and the serving base station uses these changed parameters to select appropriate target base stations for both handover and data forwarding, enabling recovery from home cell interference
Data Source
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AI summary
A method (300) and apparatus (200) for radio link failure recovery is disclosed. The method may include detecting (320) the presence of an intra-frequency neighbor base station (145) of a serving base station (135). The method may include determining (330) that a radio link parameter of an inter-frequency neighbor base station is better than a threshold. The method may include acquiring (350) system information of the inter-frequency neighbor base station if the intra-frequency neighbor base station is present and if the radio link parameter of the inter-frequency neighbor base station is better than the threshold.