Carrier Aggregation Selection via Spectrum Width Indication
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Solution Overview
Problem
In Licensed-Assisted Access using Long Term Evolution (LAA-LTE) systems, the spectrum utilization of the license-free frequency band is relatively low, and the downlink throughput of terminal devices is also low due to the network device's selection of carrier aggregation combinations based on reported capabilities, which do not match the terminal device's maximum supported spectrum width.
Innovation Solution
The network device receives carrier aggregation capability indication information from the terminal device, which includes support for intra-band non-contiguous carrier aggregation combinations and the maximum downlink spectrum width, allowing it to select the most suitable CA combination that matches the terminal device's capabilities, thereby improving spectrum utilization and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device selects CA combination based on reported CA combination type, then the terminal device can receive downlink data, but spectrum utilization of license-free frequency band is low and downlink throughput is low
Solution Approach 1:
The patent changes the parameter representation from discrete CA combination types to continuous spectrum width indication. The terminal device reports maximum supported downlink spectrum width as a quantitative parameter, enabling the network device to select CA combinations that optimally match the terminal's spectrum processing capability, thereby improving both spectrum utilization and downlink throughput simultaneously
2Ease of operation
If the network device uses fixed CA combination selection based on reported capability, then the configuration is simple, but it does not match the terminal device's maximum supported spectrum width
Solution Approach 1:
The patent replaces the mechanical matching approach (discrete CA combination type selection) with a parameter-based matching system. Instead of selecting from predefined CA combination types, the network device calculates and selects CA combinations based on the continuous spectrum width parameter reported by the terminal, achieving precise matching of spectrum width capability
Data Source
AI summary
A downlink data transmission method and apparatus, where the method includes receiving, by a network device, carrier aggregation (CA) capability indication information from a terminal device, where the CA capability indication information indicating, to the network device, that the terminal device supports a first-type intra-band non-contiguous (NC) CA combination on a first frequency band and a maximum downlink spectrum width supported by the terminal device, determining, by the network device based on the CA capability indication information, a first CA combination from at least one first-type intra-band NC CA combination of the first frequency band, where the first CA combination includes at least two component carriers (CCs), and sending, by the network device, downlink data to the terminal device using the first CA combination.