Two-Stage Downlink Control Information for Efficient UE Scheduling
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Solution Overview
Problem
In wireless communications systems, transmitting redundant downlink control information (DCI) to multiple user equipments (UEs) individually reduces spectral efficiency and achievable throughput.
Innovation Solution
Implementing a two-stage DCI scheme where a first stage carries common control information for a group of UEs, and a second stage carries UE-specific control information, with each UE determining its resource for receiving the second stage DCI based on an indication in the first stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits control information to each UE individually, then each UE receives its specific control information reliably, but the spectral efficiency and achievable throughput are reduced due to redundant transmissions
Solution Approach 1:
The control information is segmented into two stages: first DCI containing common control information applicable to multiple UEs, and second DCI containing UE-specific control information. This segmentation allows common information to be transmitted once to multiple UEs while individual information is transmitted separately, reducing redundancy and improving spectral efficiency while maintaining reliability.
Solution Approach 2:
Multiple UEs are grouped together to receive common control information through the first DCI transmission. By merging the reception of common control information for multiple UEs into a single transmission, the system eliminates redundant transmissions and improves spectral efficiency while ensuring all UEs in the group receive the necessary control information reliably.
2Reliability
If the base station transmits redundant control information to multiple UEs individually, then each UE receives complete control information, but the power consumption of the system increases
Solution Approach 1:
The control information transmission is divided into two segments: first DCI for common control information and second DCI for UE-specific control information. This segmentation reduces the total amount of data transmitted individually to each UE, thereby reducing power consumption while ensuring each UE receives complete and appropriate control information.
Solution Approach 2:
The common control information is extracted from individual UE-specific transmissions and placed into a separate first DCI that is shared among multiple UEs. This extraction eliminates redundant transmission of common information to each UE, reducing overall system power consumption while maintaining control information completeness for each UE.
3Measurement precision
If the base station transmits detailed UE-specific control information to each UE, then each UE receives accurate scheduling information, but the overhead increases
Solution Approach 1:
The control information is segmented into common portions (first DCI) and UE-specific portions (second DCI). By separating these components, the system transmits only necessary UE-specific information individually to each UE, reducing overall overhead while maintaining accurate scheduling information for each UE through the combined first and second DCI messages.
Data Source
AI summary
This disclosure provides methods, devices, and systems for resource selection supporting the identification of resources for receiving two-stage downlink control information (DCI). In some systems, for example, a base station may transmit a first stage DCI and a second stage DCI to a user equipment. The first stage DCI may include control information for a group of UEs including the UE and the second stage DCI may include control information that is specific to the UE. The UE may determine a resource to use for receiving the second stage DCI based on an indication in the first stage DCI. In some examples, the UE may determine a resource from a resource pool based on a resource selector included in the first stage DCI and receive the second stage DCI over the determined resource. The resource pool may be indicated by the first stage DCI or pre-configured at the UE.