Sidelink Carrier Aggregation with DTX-Threshold Link Failure Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing increased data traffic and the need for enhanced mobile broadband communication, particularly in sidelink (SL) communication, where direct links between User Equipments (UEs) are established without base station intervention, and there is a lack of efficient methods for handling sidelink radio link failures.
Innovation Solution
A method and device for establishing a PC5 radio resource control (RRC) connection, selecting multiple carriers, releasing carriers based on consecutive discontinuous transmissions (DTX) reaching a threshold, and detecting sidelink radio link failure, which includes a first device with a transceiver, processor, and memory for executing these operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers are selected for sidelink communication to increase data capacity, then communication throughput is improved, but system complexity and difficulty of managing radio link failures increase
Solution Approach 1:
The patent segments the carrier management by introducing a primary carrier and secondary carrier distinction. The primary carrier is used for critical control signaling and RRC communication, while secondary carriers handle data traffic. This segmentation allows independent management of each carrier's radio link, simplifying the overall system complexity while maintaining high throughput through multiple carriers.
Solution Approach 2:
The patent introduces an intermediary mechanism through the primary carrier that mediates between the multiple secondary carriers and the higher layer protocol. The primary carrier serves as a coordinator that manages the radio link failure detection and recovery processes for the entire carrier aggregation, reducing the complexity burden on each individual carrier.
2Productivity
If carrier aggregation is implemented to enhance mobile broadband capacity, then data traffic handling is improved, but reliability of radio link management deteriorates
Solution Approach 1:
The patent divides the radio link management reliability across multiple carriers with differentiated roles. The primary carrier ensures reliable control plane communication, while secondary carriers handle user plane data. This segmentation means that failures in secondary carriers do not compromise the overall connection reliability, as the primary carrier maintains the RRC connection.
Solution Approach 2:
The patent implements beforehand cushioning by establishing a primary carrier that serves as a backup and coordination point before failures occur. This primary carrier is pre-configured to maintain the RRC connection even when secondary carriers fail, providing a cushion against radio link failures and enabling smoother recovery processes.
3Measurement precision
If multiple carriers are monitored for radio link failures, then detection accuracy is improved, but processing time and latency increase
Solution Approach 1:
The patent segments the radio link failure detection process by carrier type. Each secondary carrier is monitored independently for DTX events, and the primary carrier monitors for RRC connection status. This segmentation allows parallel processing of monitoring tasks, improving detection accuracy across multiple carriers without sequentially increasing processing time.
Solution Approach 2:
The patent implements feedback mechanisms where each carrier provides independent radio link quality feedback to the higher layer. The primary carrier provides feedback on RRC connection status, while secondary carriers provide feedback on their individual link conditions. This feedback structure enables accurate detection of failures on specific carriers without requiring comprehensive analysis of all carriers, reducing processing time.
Data Source
AI summary
Provided are a method for performing wireless communication by a first device and an apparatus supporting same. The first device may: establish a PC5 radio resource control (RRC) connection with a second device; select a plurality of carriers; release, based on a number of consecutive discontinuous transmissions (DTX) for a carrier among the plurality of carriers reaching a threshold value, the carrier; and detect, based on all of the plurality of carriers being released, a sidelink radio link failure.