Unlicensed Spectrum Resource Allocation via Deferred Scheduling
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Solution Overview
Problem
The unpredictability of unlicensed spectrum availability in License Assisted Access (LAA) systems leads to resource shortages and waste, as base stations cannot determine with certainty whether unlicensed carriers are available for transmission, resulting in inefficient resource allocation.
Innovation Solution
A resource allocation method that involves sending a scheduling instruction to user equipment, determining an available carrier in the unlicensed spectrum through clear channel assessment, and sending a resource allocation message to explicitly inform the user equipment of the available carrier for transmission, thereby avoiding resource unavailability and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a base station schedules user equipment in advance on unlicensed carriers, then user throughput can be improved, but the unlicensed spectrum may not be available at transmission time causing resource allocation failure
Solution Approach 1:
The base station performs preliminary scheduling of user equipment in advance, determining transmission resources and formats before actual transmission. This allows user equipment to prepare data packets ahead of time, improving throughput while the deferred availability check ensures reliability
Solution Approach 2:
The base station performs clear channel assessment (CCA) at the scheduled transmission time to check carrier availability. Based on this feedback, it determines whether to send a reservation signal or notify user equipment of resource unavailability, ensuring reliable resource allocation
2Measurement precision
If a base station performs clear channel assessment at transmission time, then resource availability can be confirmed, but resource waste occurs when pre-scheduled carriers are unavailable
Solution Approach 1:
The base station performs CCA at transmission time to get accurate feedback on carrier availability. When carriers are unavailable, it notifies user equipment to avoid transmission attempts, preventing energy waste while maintaining precise availability detection
Solution Approach 2:
User equipment monitors resource allocation messages and autonomously determines whether to transmit or discard prepared data based on base station notifications, avoiding wasted transmission attempts on unavailable carriers
Data Source
AI summary
Embodiments of the present invention disclose a resource allocation method, a transmission method, and apparatuses. The resource allocation method comprises: sending a scheduling instruction, wherein the scheduling instruction is used to instruct a user equipment to prepare for transmission; determining an available carrier in an unlicensed spectrum; and sending a resource allocation message in response to that an available carrier exists, wherein the resource allocation message is used to instruct to allocate the available carrier to the transmission of the user equipment. According to the method and apparatus of the embodiments of the present invention, after an available carrier is determined, a resource allocation message is sent again to explicitly inform a user equipment of the available transmission resource, thereby avoiding the problem of resource unavailability and/or resource waste caused by the unpredictability of whether an unlicensed spectrum is available.