Unlicensed Spectrum Carrier Sharing via Single-Slot CCA
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Solution Overview
Problem
Existing unlicensed spectrum-based wireless communication methods have limited carrier utilization due to restricted sharing of carriers between base stations and terminal devices, primarily using clear channel assessment (CCA) with random backoff, which restricts the efficient use of unlicensed spectrum resources.
Innovation Solution
The method involves a base station occupying a first carrier using CCA with random backoff and a second carrier using single-slot CCA, with the base station sharing the second carrier with the terminal device for uplink information transmission, allowing the terminal device to send data during the maximum channel occupancy time determined by the first CCA, thereby enhancing spectrum resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station shares only carriers occupied by CCA with random backoff with terminal devices, then the terminal device can send uplink information on these carriers, but the utilization of unlicensed spectrum resources is limited
Solution Approach 1:
The patent extends carrier sharing capability from only CCA with random backoff carriers to include both CCA with random backoff carriers and single-slot CCA carriers. This makes the carrier sharing mechanism universal, allowing terminal devices to send uplink information on multiple types of carriers, thereby improving overall unlicensed spectrum utilization while maintaining reliable uplink transmission capability
Solution Approach 2:
The patent segments the carrier occupation mechanism into two distinct types: CCA with random backoff for first carriers and single-slot CCA for second carriers. By segmenting the approach and allowing terminal devices to access both types of carriers, the system achieves better resource utilization while maintaining the specific advantages of each CCA type
2Reliability
If the base station uses only CCA with random backoff for carrier assessment, then the channel access is reliable, but the spectrum resource utilization is reduced
Solution Approach 1:
The patent introduces dynamic carrier access by allowing the base station to switch between two CCA mechanisms: CCA with random backoff for reliable channel access and single-slot CCA for rapid carrier occupation. This dynamic approach enables the system to adapt to different traffic conditions and channel states, achieving both reliability and high spectrum utilization
Solution Approach 2:
The patent changes the CCA assessment parameters by introducing single-slot CCA as an alternative to the traditional CCA with random backoff. By adjusting the assessment time parameter (from multiple slots with random backoff to a single slot), the system can rapidly occupy carriers when conditions permit, thereby improving spectrum resource utilization while maintaining access reliability
Data Source
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AI summary
Embodiments of the present invention provide an unlicensed spectrum-based wireless communication method, a base station, and a terminal device. The method includes: occupying, by a base station, a first carrier on an unlicensed spectrum by using a first clear channel assessment CCA, where the first CCA is a single-slot CCA; sending, by the base station, first indication information to a terminal device, where the first indication information is used to instruct the terminal device to send uplink information to the base station on the first carrier; and receiving, by the base station on the first carrier, the uplink information from the terminal device. In the embodiments of the present invention, utilization of an unlicensed spectrum resource can be improved.