Unlicensed Carrier Transmission Parameter Determination
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Solution Overview
Problem
In Licensed Assisted Access (LAA) systems, the uncertainty of unlicensed spectrum availability leads to inefficient resource allocation and potential channel access failures, resulting in wasted transmission resources and reduced flexibility and efficiency.
Innovation Solution
A method and apparatus that determine specific transmission parameters for user equipment based on the actual availability of carriers in unlicensed spectra, allowing for flexible uplink transmission parameter selection and optimization, thereby preventing resource wastage and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station specifies transmission parameters in advance for multiple unlicensed carriers, then the scheduling efficiency is improved, but the transmission resource waste increases due to uncertain channel access
Solution Approach 1:
The patent applies dynamics by making transmission parameters adjustable based on actual channel access outcomes. The base station receives feedback about which carriers were successfully accessed and dynamically adjusts transmission parameters for subsequent transmissions, transforming static pre-specified parameters into dynamic adaptive parameters that match actual channel conditions.
Solution Approach 2:
The patent changes transmission parameters (such as power allocation, resource blocks, modulation schemes) based on the actual availability of unlicensed carriers. When channel access succeeds or fails, the system modifies parameters like transmit power and resource allocation to optimize performance and avoid wasting resources on carriers that cannot be accessed.
2Productivity
If the base station schedules uplink transmission on multiple unlicensed carriers simultaneously, then the system capacity is improved, but the transmission reliability decreases due to uncertain channel access
Solution Approach 1:
The patent implements feedback mechanisms where the base station receives information about actual channel access outcomes from user equipment. Based on this feedback regarding which carriers were successfully accessed or failed, the base station adjusts scheduling decisions and transmission parameters for future transmissions, improving reliability through learned experience while maintaining high system capacity.
Solution Approach 2:
The base station performs preliminary scheduling on multiple carriers and prepares transmission parameters in advance, but incorporates mechanisms to handle potential access failures. By pre-configuring alternative parameter sets and having contingency plans based on expected channel conditions, the system maintains reliability while pursuing high capacity through multi-carrier scheduling.
3Adaptability or versatility
If the base station uses contention mechanism for fair spectrum access, then the fairness among systems is improved, but the transmission efficiency decreases due to access uncertainty
Solution Approach 1:
The patent applies dynamics by adapting transmission parameters based on actual channel access outcomes from contention mechanisms. While maintaining fair access through contention, the system dynamically adjusts parameters like power allocation and resource assignment based on which carriers were successfully accessed, thereby recovering transmission efficiency despite the fairness constraints imposed by contention-based access.
Solution Approach 2:
The system changes transmission parameters in response to contention outcomes. When contention succeeds or fails on specific carriers, the base station modifies parameters such as transmit power, resource block allocation, and scheduling decisions to optimize efficiency while respecting the fair access requirements imposed by the contention mechanism.
Data Source
AI summary
Embodiments of the present application disclose a transmission parameter determining method, a transmission control method, and apparatuses therefor. The transmission parameter determining method comprises: obtaining transmission parameter information associated with at least two carriers allocated for a user equipment, wherein the at least two carriers comprise a carrier resource in an unlicensed spectrum, and the transmission parameter information is used to indicate at least one first transmission parameter separately associated with at least two possible use statuses of the at least two carriers; determining an available carrier of the user equipment in the at least two carriers; and determining at least one second transmission parameter, associated with the determined available carrier, of the user equipment at least according to the transmission parameter information. The methods and apparatus of the embodiments of the present application can prevent some transmission resources from being wasted.