Downlink Control Channel Link Adaptation via Adaptive Coreset

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Solution Overview

Problem

Current wireless communication systems, particularly in 5G, face challenges in implementing link adaptation for downlink control channels due to the need for robust modulation and code rates, which is cumbersome for mobile devices and inefficient in resource usage, as existing approaches cannot adapt parameters like reference signal density, modulation, and code rates effectively.

Innovation Solution

The system adapts transmission parameters for downlink control channels based on channel conditions by sending initial and adaptive coreset indications to mobile devices, allowing for efficient use of resources and power, using techniques like polar codes and higher layer signaling to dynamically adjust parameters such as modulation, code rate, and reference signal density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If link adaptation is implemented for downlink control channels to optimize resource usage, then system throughput and resource efficiency improve, but mobile device complexity and processing burden increase

Engineering Contradiction:

Improvesystem throughputVSAvoidmobile device complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The network device acts as an intermediary by determining and signaling the second coreset indication to the mobile device. This mediator approach allows the network to handle the complexity of link adaptation parameter selection, while the mobile device simply receives and applies the signaled parameters, thus improving system throughput without significantly increasing mobile device complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system dynamically changes transmission parameters (modulation type, code rate, reference signal density) based on channel conditions. The network device determines a second coreset indication with adapted parameters when channel conditions deteriorate, allowing the system to optimize throughput by adapting parameters rather than increasing device complexity

Inventive Principle:

Principle #35Parameter changes

2Reliability

If robust modulation and code rates are used for downlink control channels to ensure reliability, then transmission reliability improves, but resource usage efficiency deteriorates

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidresource usage efficiency

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The system dynamically adjusts modulation and code rate parameters based on channel conditions. When channel conditions are good, more efficient modulation (e.g., 64-QAM) and higher code rates are used to improve resource efficiency. When conditions deteriorate, the network device signals a second coreset indication with more robust parameters (e.g., QPSK, lower code rate) to maintain reliability, thus resolving the contradiction between reliability and resource efficiency

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes physical layer parameters adaptively: reference signal density is increased when channel conditions worsen to improve reliability, while modulation type and code rate are adjusted to balance reliability and resource usage. This parameter adaptation allows the system to maintain transmission reliability while optimizing resource efficiency based on actual channel conditions

Inventive Principle:

Principle #35Parameter changes

3Loss of substance

If link adaptation parameters are dynamically adjusted based on channel conditions, then resource usage efficiency improves, but device complexity and power consumption increase

Engineering Contradiction:

Improveresource usage efficiencyVSAvoidmobile device power consumption

Core Design Contradiction:

Loss of substanceVSUse of energy by moving object

Solution Approach 1:

The network device serves as an intermediary that determines link adaptation parameters and signals them to the mobile device via higher layer signaling or group common control channels. This approach allows resource usage efficiency to improve through dynamic parameter adjustment, while the mobile device avoids the computational burden of determining parameters itself, thus limiting the increase in power consumption

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The network device performs the complex analysis and parameter determination in advance before transmitting data to the mobile device. By preliminarily determining the optimal coreset indication based on channel conditions, the network device enables the mobile device to simply apply pre-determined parameters, improving resource efficiency while minimizing the mobile device's processing and power requirements

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10355813B2Link adaptation on downlink control channel in a wireless communications system

Publication Date: 2019.07.16 AT&T INTELLECTUAL PROPERTY I L P

AI summary

Link adaptation on downlink control channels is provided herein. A method can comprise sending, by a network device of a wireless network and comprising a processor, first data indicating a first downlink control channel to a mobile device. The first data indicating the downlink control channel can comprise a first coreset indication that comprises a first parameter used to decode the first downlink control channel at the mobile device. The method can also include determining, by the network device, a second coreset indication for the mobile device. The second coreset indication can comprise a second parameter that can be adaptively determined based on a condition of an environment determined to be associated with the mobile device.