Carrier Switching for Unlicensed Data Retransmission
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Solution Overview
Problem
In wireless communications networks, data retransmission on unlicensed carriers is hindered by the need to preempt channels, leading to interruptions in Hybrid Automatic Repeat Request (HARQ) processes, as devices cannot continuously occupy unlicensed carriers.
Innovation Solution
A method where a first device transmits data using an unlicensed carrier and, upon determining the carrier is unavailable, retransmits the data using a second carrier, which can be either licensed or unlicensed, allowing continuous data transmission without channel preemption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted using an unlicensed carrier, then data throughput is improved, but channel availability is reduced due to preemption requirements
Solution Approach 1:
The patent changes the parameter of carrier type from single unlicensed carrier to dual carrier (licensed + unlicensed), allowing the system to switch between carriers based on availability. This parameter change enables maintaining high throughput when unlicensed carrier is available while ensuring reliability by falling back to licensed carrier when unlicensed carrier is preempted.
Solution Approach 2:
The licensed carrier acts as an intermediary backup resource. When the unlicensed carrier becomes unavailable due to preemption, the system uses the licensed carrier as a mediator to continue HARQ retransmission, thus maintaining channel availability and reliability without completely losing the throughput benefits of unlicensed spectrum.
2Ease of operation
If a device preempts the unlicensed carrier again after occupying it for a specific time, then channel access compliance is improved, but HARQ retransmission continuity is interrupted
Solution Approach 1:
The patent establishes continuity of HARQ retransmission by creating a seamless handover mechanism between carriers. When the unlicensed carrier must be preempted for compliance, the system maintains continuous useful action by switching the retransmission to the licensed carrier, ensuring the HARQ process continues without interruption despite the preemption event.
Solution Approach 2:
The system dynamically switches between unlicensed and licensed carriers based on real-time channel availability and preemption status. This dynamic behavior allows the system to comply with channel access requirements while maintaining HARQ continuity, adapting the transmission medium according to changing conditions rather than being static on a single carrier.
3Adaptability or versatility
If the sending device needs to preempt the channel again on the unlicensed carrier, then spectrum sharing fairness is improved, but data retransmission reliability is reduced
Solution Approach 1:
The patent makes the communication system multi-functional by enabling it to operate on both unlicensed and licensed carriers for HARQ retransmission. This universality allows the system to share unlicensed spectrum fairly with other users while maintaining reliable data retransmission by having the licensed carrier as a backup function, thus resolving the conflict between spectrum sharing fairness and retransmission reliability.
Data Source
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AI summary
The present invention discloses a data retransmission method, a device, and a system, and relates to the communications field, so as to resolve a prior-art problem that when a device transmits data by using an unlicensed carrier, the data cannot be retransmitted because a channel needs to be preempted again. A specific solution is as follows: A first device transmits data to a second device by using a first carrier, where the first carrier is an unlicensed carrier. The first device obtains status information of the first carrier, where the status information is used to determine whether the first carrier is available. When the first carrier is unavailable, the first device retransmits the data to the second device by using a second carrier, where the first carrier and the second carrier are different carriers. The present invention is used for data retransmission.