Terminal Scheduling Low-Latency Traffic Licensed Bands
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Solution Overview
Problem
The Long Term Evolution (LTE) system's Licensed Assisted Access (LAA) technology experiences high latency when transmitting data on unlicensed frequency bands, which is unacceptable for low-latency services like video calls and real-time gaming, due to the need for terminals to wait for channel availability.
Innovation Solution
A data packet transmission method where a terminal identifies running low-latency services and instructs the network to schedule data packets to licensed frequency bands for transmission, avoiding the latency issues associated with unlicensed frequency bands by using centrally scheduled resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LAA technology is used to transmit data on unlicensed frequency band, then throughput rate is improved, but transmission latency increases
Solution Approach 1:
The patent segments data traffic into two categories: delay-tolerant traffic transmitted over unlicensed frequency bands using LAA technology, and delay-sensitive traffic transmitted over licensed frequency bands. This segmentation allows the system to simultaneously achieve high throughput for non-critical traffic while ensuring low latency for time-sensitive applications.
Solution Approach 2:
The patent applies different transmission quality requirements to different types of traffic. Delay-sensitive traffic receives priority handling with guaranteed latency bounds through licensed band transmission, while delay-tolerant traffic utilizes the higher capacity of unlicensed bands. This local quality differentiation resolves the contradiction by optimizing each traffic type according to its specific requirements.
2Reliability
If terminal listens for channel availability before transmitting on unlicensed frequency band, then channel access reliability is improved, but transmission latency increases
Solution Approach 1:
The patent extracts delay-sensitive traffic from the LAA transmission path and routes it through the licensed frequency band. This extraction removes the latency-inducing channel listening and contention mechanisms from the critical traffic path, while maintaining them for non-critical traffic on unlicensed bands.
Solution Approach 2:
The patent introduces licensed frequency bands as an intermediary transmission path for delay-sensitive traffic. This intermediary channel provides a alternative route that bypasses the contention-based access mechanism of unlicensed bands, ensuring reliable and low-latency transmission for time-critical data.
Data Source
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AI summary
A data packet transmission method and an apparatus are provided. The method includes: obtaining, by a terminal, N application programs that are running, where N is an integer greater than 0; and if the N application programs include an application program including a low-latency service, instructing a network device to schedule a data packet of the terminal to a licensed frequency band for transmission. When determining that the N running application programs include the application program including a low-latency service, the terminal may instruct the network device to schedule the data packet of the terminal to the licensed frequency band for transmission, so as to transmit a data packet of the low-latency service by using the licensed frequency band. Resources in the licensed frequency band are centrally scheduled by the network device, instead of being used through contention. Therefore, transmitting the data packet of the low-latency service by using the licensed frequency band can meet a latency requirement for the low-latency service. In this way, a high-latency problem caused when data is transmitted by using an unlicensed frequency band is resolved.