Group Common DCI for Unicast Scheduling of Multiple UEs
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in scheduling downlink control information for multiple user equipment (UEs), leading to increased signaling overhead and reduced system efficiency, particularly in automated deployments where data is aperiodic and small, causing resource collisions and decreased spectral efficiency.
Innovation Solution
Implementing a method where multiple UEs within a cell can identify and decode a single downlink control information (DCI) using a UE group-common radio network temporary identifier (RNTI), applying a UE-specific transformation rule to common scheduling parameters for resource allocation, thereby reducing signaling overhead and mitigating resource collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate UE-specific DCI is used to schedule multiple UEs, then each UE can be individually scheduled, but signaling overhead increases and system efficiency decreases
Solution Approach 1:
The patent merges multiple UE-specific DCI messages into a single group-common DCI message that can schedule multiple UEs simultaneously. The group-common DCI contains common scheduling parameters that are applicable to multiple UEs, thereby reducing the number of separate DCI transmissions and lowering signaling overhead while maintaining individual UE scheduling capability through UE-specific parameter fields within the unified message.
Solution Approach 2:
The group-common DCI message is designed to serve multiple UEs universally while still providing UE-specific customization. The message structure includes both common parameters applicable to all scheduled UEs and UE-specific parameters that allow individual configuration, enabling a single DCI transmission to fulfill multiple scheduling functions and reduce overall signaling requirements.
2Adaptability or versatility
If separate UE-specific DCI is used for aperiodic small data transmissions, then scheduling flexibility is maintained, but resource collisions increase and spectral efficiency decreases
Solution Approach 1:
The patent combines scheduling information for multiple UEs with aperiodic small data transmissions into a single group-common DCI message. This unified approach reduces the probability of resource collisions by coordinating resource allocation across multiple UEs simultaneously, while maintaining scheduling flexibility through UE-specific parameter fields that allow adaptive resource assignment for aperiodic transmissions.
Solution Approach 2:
The patent incorporates feedback mechanisms where UEs report their scheduling requirements and resource status to the base station. This feedback enables the base station to make informed scheduling decisions when constructing group-common DCI messages, optimizing resource allocation for aperiodic small data transmissions and reducing collisions while maintaining flexibility.
3Quantity of substance
If multiple UEs decode separate DCI messages, then individual resource allocation is achieved, but PDCCH overhead increases
Solution Approach 1:
The patent merges multiple individual DCI messages into a single group-common DCI message that allocates resources for multiple UEs. The message structure efficiently packs common parameters that apply to all scheduled UEs and includes compact UE-specific parameter fields, thereby achieving individual resource allocation precision while significantly reducing the total number of DCI transmissions and associated PDCCH overhead.
Solution Approach 2:
The patent changes the parameter representation format in DCI messages by using compact UE-specific parameter fields and efficient encoding schemes. This parameter optimization allows the group-common DCI to convey individualized resource allocation information for multiple UEs in a space-efficient manner, reducing the message size and consequently lowering PDCCH overhead while maintaining allocation precision.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some wireless communications system, a base station may schedule multiple user equipment (UEs) for unicast transmissions using a single downlink control information (DCI) format. For example, a first UE may receive, from a base station, DCI that includes unicast scheduling information for multiple UEs including the first UE. The first UE may determine, from the unicast scheduling information, a set of resources on which to communicate data with the base station. In such cases, the UE may transmit or receive data transmissions using the determined set of resources. In some examples, each UE of the multiple UEs may determine respective sets of resources based on one or more UE-specific transformation rules applied to common scheduling parameters of the DCI.