Modulation Coding Scheme Determination for Reused Resources
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Solution Overview
Problem
Adaptive modulation and coding technologies are inadequate for adjusting modulation and coding schemes in scenarios where multiple terminal devices reuse the same time-frequency resource, as they cannot accurately reflect specific interference experienced by individual devices.
Innovation Solution
A method and apparatus that determine a modulation and coding scheme by calculating a channel quality indicator (CQI) based on the signal-to-interference-plus-noise ratio (SINR) and the number of terminal devices reusing a time-frequency resource, considering decoding iterations and acknowledgement messages, to accurately adjust the scheme for each terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminal devices reuse the same time-frequency resource for data transmission, then resource utilization efficiency is improved, but the ability to accurately reflect specific interference on each terminal device deteriorates
Solution Approach 1:
The patent segments the general CQI measurement into device-specific CQI measurements. Each terminal device performs separate interference measurements on the reused time-frequency resource, creating individualized CQI values that reflect the specific interference environment of each device. This segmentation resolves the contradiction by maintaining resource reuse while enabling precise per-device interference characterization.
Solution Approach 2:
The patent applies local quality by making the CQI measurement specific to each terminal device's local interference conditions. Instead of a single general CQI for all devices sharing the resource, each device obtains a customized CQI that reflects its specific interference environment, thereby maintaining both resource utilization efficiency and measurement precision.
2Device complexity
If traditional AMC technology is used for single-terminal devices, then CQI calculation is simple, but it becomes inapplicable when multiple terminal devices reuse the same time-frequency resource
Solution Approach 1:
The patent extends the CQI calculation mechanism to serve multiple terminal devices simultaneously. By having each device perform its own interference measurement and CQI calculation on the shared resource, the system achieves universality where the same time-frequency resource can be efficiently allocated to multiple devices while maintaining individualized adaptation capability.
Solution Approach 2:
Each terminal device performs self-service by independently measuring its own interference conditions and calculating its specific CQI value. This self-service approach eliminates the need for complex centralized interference measurement while enabling multi-device applicability, as each device autonomously adapts to its local environment.
3Loss of energy
If a single general CQI is used for all terminal devices sharing a resource, then calculation overhead is reduced, but modulation and coding scheme adjustment cannot be optimized for each device
Solution Approach 1:
The patent introduces dynamic, device-specific CQI values that adapt to each terminal's unique interference conditions. Rather than using a static general CQI, each device maintains its own dynamic CQI measurement that updates based on its specific channel conditions, thereby improving MCS adjustment accuracy without excessive overhead since each device only needs to measure and report its own value.
Data Source
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AI summary
A method for determining a Modulation and Coding scheme is disclosed. The method is performed by a network device. The method includes: determining a quantity K of terminal devices that reuse a first time-frequency resource in a first time period to receive downlink data from the network device, where K≥2 (S210); obtaining a channel quality indicator CQI, where the CQI is determined according to a signal to interference plus noise ratio SINR of a channel and the quantity K of the terminal devices, where the channel is a channel based on the first time-frequency resource, and the channel is used to transmit downlink data between the network device and a first terminal device in the first time period (S220); and determining a Modulation and Coding scheme MCS of the first terminal device according to the CQI (S230).