Compact DCI Format for Multi-TB MIMO Control Overhead
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in supporting multi-Transport Block (TB) MIMO transmission from User Equipment (UE) to a base station, particularly due to overheads from repeated indications for each TB and wasted resources when not all TBs are transmitted.
Innovation Solution
The introduction of compact DCI formats that include an indication of which TBs receive specific control information and status indications for other TBs, allowing for efficient multi-TB MIMO transmission by reducing the size of the DCI format and dynamically managing TB transmission based on channel and traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DCI formats are used for multi-TB MIMO transmission, then complete control information can be provided for each TB, but the overhead increases due to repeated indications for each TB
Solution Approach 1:
The DCI format is segmented into common fields applicable to all TBs and TB-specific fields that are only included when necessary. This segmentation allows the system to provide complete control information for each TB when needed while avoiding redundant overhead when common settings apply to multiple TBs.
Solution Approach 2:
The patent applies partial action by including TB-specific control information fields only for the TBs that require different transmission parameters. When multiple TBs share the same resource allocation, MCS, and other parameters, the DCI format omits redundant fields, thereby reducing overhead while maintaining necessary control precision.
2Productivity
If all TBs are configured for transmission, then multi-TB MIMO capability is fully utilized, but resources are wasted when not all TBs are transmitted
Solution Approach 1:
The DCI format dynamically adapts its structure based on the actual transmission requirements. The eNB includes or excludes TB-specific control fields depending on whether each TB requires independent configuration, allowing the system to fully utilize multi-TB MIMO capability when needed while avoiding resource waste when fewer TBs are transmitted.
Solution Approach 2:
The patent changes the parameter set included in the DCI format based on transmission conditions. By dynamically adjusting which control fields are present in the DCI message, the system optimizes resource allocation to match actual traffic demands, preventing energy waste from configuring and transmitting TBs that are not needed.
3Quantity of substance
If compact DCI formats are used to reduce overhead, then resource efficiency improves, but the ability to provide detailed control information for each TB is reduced
Solution Approach 1:
The DCI format is designed with universal fields that can apply to multiple TBs simultaneously, such as common resource allocation and power control parameters. This multi-functionality allows a single DCI message to efficiently control multiple TBs without requiring separate detailed specifications for each, maintaining resource efficiency while preserving necessary control precision through selective inclusion of TB-specific fields.
Data Source
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AI summary
Multiple Transport Blocks (TBs) or data streams are provided in Multi-Input-Multi-Output (MIMO) wireless communication systems herein. The base station (eNB) controls and schedules all downlink and uplink transmission to and from User Equipments, which need to receive an uplink grant from BS/eNB before they transmit. The uplink grant is carried as one of the control indication message in the downlink. The BS/eNB also transmits ACK/NACK information in the HARQ indication channel to the UE for each of the transport blocks. The UE detects the control indication to determine the actual uplink scheduling, as well as the HARQ indication. A method of transmitting a control indication message, which contains a detailed transmit format for one of the TBs to be transmitted, while allowing simultaneous communications on the other TBs is also enclosed.