Dynamic MCS Table Indication for 5G Throughput
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G wireless communication systems, there is a mismatch between the configuration of channel quality indicator (CQI) tables and modulation and coding scheme (MCS) tables, leading to a loss in link and system throughput, as the network cannot schedule user equipment with higher order modulation schemes like 256-QAM even if the equipment is capable of handling them.
Innovation Solution
The network dynamically indicates the use of a higher order modulation and coding scheme table, such as 256-QAM, by employing techniques like separate flags, unused bit combinations in existing fields, or implicit agreements, allowing the user equipment to switch from a pre-configured 64-QAM table to a 256-QAM table during data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network configures user equipment with a 64-QAM MCS table, then the configuration is simple and compatible, but the network cannot schedule user equipment with 256-QAM modulation even if the equipment is capable of handling it, resulting in loss of link and system throughput
Solution Approach 1:
The patent implements dynamic switching between 64-QAM and 256-QAM MCS tables based on channel conditions and equipment capability. The network can dynamically indicate to the UE which MCS table to use through DCI signaling, allowing the system to adapt between different modulation orders rather than being statically configured. This resolves the contradiction by enabling high throughput (256-QAM) when conditions permit while maintaining simplicity (64-QAM) when they don't.
Solution Approach 2:
The patent changes the modulation order parameter from fixed 64-QAM to a variable parameter that can switch between 64-QAM and 256-QAM. By introducing a dynamic indication mechanism in the DCI that specifies which MCS table to use, the system can adjust the modulation parameter based on current channel quality and equipment capability, thereby achieving higher throughput when possible while maintaining backward compatibility.
2Productivity
If the network configures a 256-QAM CQI table for user equipment, then the equipment can potentially achieve higher throughput, but the MCS table configuration remains at 64-QAM, creating a mismatch that prevents the network from scheduling 256-QAM modulation
Solution Approach 1:
The patent introduces dynamic indication in the DCI to switch between 64-QAM and 256-QAM MCS tables, allowing the network to align the MCS table configuration with the CQI table configuration when 256-QAM is beneficial. This dynamic mechanism ensures consistency between CQI and MCS configurations by enabling the network to use 256-QAM MCS table when the UE is configured with 256-QAM CQI table, thereby resolving the mismatch problem.
Solution Approach 2:
The patent utilizes CQI feedback from the UE to inform the network about channel conditions and equipment capability. Based on this feedback, the network can make informed decisions about whether to configure and schedule 256-QAM modulation. The feedback mechanism ensures that the MCS table configuration matches the CQI table configuration and actual channel conditions, maintaining configuration consistency while enabling higher throughput.
3Adaptability or versatility
If the network uses a 64-QAM modulation scheme, then the compatibility and ease of operation are maintained, but the spectral efficiency and data carrying capacity are limited
Solution Approach 1:
The patent makes the MCS table configuration universal by supporting both 64-QAM and 256-QAM modulation schemes within the same system. The network can select which MCS table to use based on UE capability and channel conditions, allowing the system to function effectively across different scenarios. This multi-functionality enables the network to maintain compatibility with 64-QAM while also utilizing 256-QAM for higher spectral efficiency when appropriate.
Solution Approach 2:
The patent implements dynamic switching between 64-QAM and 256-QAM MCS tables based on channel conditions and equipment capability. The network can dynamically indicate to the UE which MCS table to use through DCI signaling, allowing the system to adapt between different modulation orders rather than being statically configured. This resolves the contradiction by enabling high throughput (256-QAM) when conditions permit while maintaining simplicity (64-QAM) when they don't.
Data Source
AI summary
The described technology is generally directed towards dynamically changing which quadrature amplitude modulation (QAM) table a user equipment is to use based on channel quality information. A network schedules a user equipment with 256 QAM modulation if the user equipment recommends 256 QAM in the CQI report (and the scheduler decides to use 256 QAM for that particular user equipment). The network indicates to the user equipment that it has to use 256 QAM modulation and coding scheme (MCS) table and not the configured QAM MCS table while determining the scheduling parameters by decoding PDCCH.