Downlink Parameter Determination Using Highest Order Modulation
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Solution Overview
Problem
In current LTE systems, the introduction of higher-order modulation schemes like 256QAM is hindered because downlink parameters are determined based on the lowest order modulation scheme supported by user equipment (UE) within a category, leading to suboptimal spectral efficiency in downlink transmission.
Innovation Solution
A method and apparatus that allow base stations to receive category and modulation information from UE, enabling the determination of downlink parameters based on the UE's specific highest order modulation scheme, thereby optimizing downlink transmission parameters for each UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink parameter is determined according to the lowest order modulation scheme supported by UE in a category, then compatibility is ensured, but spectral efficiency is reduced
Solution Approach 1:
The patent applies local quality by determining downlink parameters individually for each UE based on its specific modulation capability rather than using a unified parameter for all UEs in a category. The base station determines downlink parameters according to the highest order modulation scheme that the UE supports, allowing each UE to utilize its local capability for optimal spectral efficiency while maintaining overall system compatibility.
2Device complexity
If downlink parameter is determined according to UE category only, then configuration simplicity is maintained, but modulation capability utilization is insufficient
Solution Approach 1:
The patent introduces dynamics by making the downlink parameter determination adaptive to each UE's modulation capability. Instead of a static category-based configuration, the base station dynamically determines downlink parameters based on the highest order modulation scheme supported by each UE, enabling flexible optimization of spectral efficiency for different UE capabilities while maintaining manageable configuration through standardized capability reporting.
Data Source
AI summary
Embodiments disclose a method, a device, and an apparatus for determining a downlink parameter. The method may include: receiving category information and modulation information that are reported by UE, where the category information includes a UE category of the UE, and the modulation information includes a highest order modulation scheme supported by the UE; and determining, as a downlink parameter of the UE, a downlink parameter that corresponds to the UE category of the UE and the highest order modulation scheme supported by the UE, where the downlink parameter of the UE is determined according to a correspondence from a UE category of the UE and a highest order modulation scheme supported by the UE to a downlink parameter of the UE as well as the UE category of the UE and the highest order modulation scheme supported by the UE.