DRB Mapping Recovery for Wireless Data Transmission Failures
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling data transmissions after detecting failures, such as radio link failures or handover failures, particularly in LTE systems using carrier aggregation and unlicensed spectrum operations like LTE-U/LAA, where re-establishing data flows is complex and requires efficient recovery mechanisms.
Innovation Solution
A communication device and method that configures and manages data radio bearers (DRBs) and mappings within the system to recover from failures by sending failure recovery requests and messages, allowing for seamless re-establishment of data transmissions over alternative DRBs, ensuring continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system uses carrier aggregation and unlicensed spectrum operations to improve data transmission capacity, then productivity is improved, but device complexity increases due to multiple DRBs and mapping configurations
Solution Approach 1:
The patent segments the data transmission path by introducing multiple Data Radio Bearers (DRBs) with different mapping configurations to different physical channels. This allows independent optimization of each DRB for specific transmission conditions, thereby increasing overall data transmission capacity while managing complexity through modular organization of bearers and mappings.
Solution Approach 2:
The patent implements dynamic selection and reconfiguration of DRBs and their mapping configurations based on transmission conditions and failure detection. The system can dynamically switch between different DRBs and adjust mapping relationships to adapt to changing channel conditions, maintaining high productivity while the complexity is managed through automated dynamic adjustment rather than static complex configuration.
2Productivity
If the system implements multiple DRBs and mapping configurations to improve data transmission efficiency, then productivity is improved, but the difficulty of detecting and measuring transmission failures increases
Solution Approach 1:
The patent implements feedback mechanisms where the receiving end detects transmission failures and sends notifications to the transmitting end. This feedback loop enables automatic failure detection across multiple DRBs without requiring complex monitoring at the transmitting end, thereby maintaining high transmission efficiency while reducing failure detection complexity through distributed detection and feedback.
Solution Approach 2:
The system enables self-service failure detection by allowing the receiving end to autonomously detect and report failures. Each DRB and mapping configuration can be monitored independently by the receiving end, which automatically identifies failures and triggers recovery procedures without requiring complex centralized monitoring, thus improving efficiency while keeping detection manageable.
3Reliability
If the system uses alternative DRBs for failure recovery to improve reliability, then reliability is improved, but the time required for re-establishing data flows increases
Solution Approach 1:
The patent prepares multiple DRBs with different mapping configurations in advance before failures occur. These alternative bearers are pre-configured and ready for immediate use, eliminating the need for time-consuming reconfiguration during failure recovery. This preliminary preparation ensures high reliability by having backup paths ready while minimizing recovery time through pre-established alternative routes.
Solution Approach 2:
The patent changes transmission parameters by switching between different DRBs with varying mapping configurations to different physical channels. When a failure is detected, the system rapidly changes the active DRB parameters rather than reconfiguring from scratch, allowing quick transition to alternative bearers that are already configured, thus maintaining reliability while reducing recovery time through parameter switching rather than full reconfiguration.
4Reliability
If the system implements automated failure recovery mechanisms to improve reliability, then reliability is improved, but device complexity increases due to additional control procedures
Solution Approach 1:
The patent implements self-service failure recovery where the receiving end autonomously detects failures and sends notifications to the transmitting end, which then automatically selects alternative DRBs and re-establishes data flows without human intervention. This automated self-service approach improves reliability through continuous monitoring and immediate recovery while managing complexity by distributing control functions rather than requiring complex centralized management.
Solution Approach 2:
The automated recovery mechanism works by changing transmission parameters - specifically switching between pre-configured DRBs with different mapping configurations. This parameter-based approach simplifies control procedures compared to full reconfiguration, as the system only needs to change which DRB is active rather than re-establishing entire transmission paths, thereby improving reliability while keeping control complexity manageable through parameter switching.
Data Source
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AI summary
A communication device for handling data transmissions after detecting a failure comprises a storage device for storing instructions and a processing circuit coupled to the storage device . The processing circuit is configured to execute the instructions stored. The instructions comprise receiving a first radio resource control (RRC) message configuring a first data radio bearer (DRB) and configuring a mapping that a first flow is mapped to the first DRB, from a first BS; transmitting a first plurality of protocol data units (PDUs) of the first flow; receiving a PDU of the first flow or a second flow over a second DRB; transmitting a second plurality of PDUs of the first flow; detecting a failure; transmitting a failure recovery request message to the first BS or a second BS; receiving a failure recovery message; and transmitting a third plurality of PDUs of the first flow over the first DRB.