Group-Assisted Downlink Transmission via D2D Resource Sharing
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Solution Overview
Problem
In traditional wireless communication systems, downlink transmission to a target UE in a D2D group involves duplicating data across multiple UEs, leading to latency and scalability issues due to the need for dedicated resource partitions for each cooperating UE.
Innovation Solution
The method involves masking control information with a group ID, allowing UEs to receive data using the same time-frequency resource partition, and using D2D communication for UEs to assist the target UE with receiving data, either as the original data or a re-encoded version, thereby reducing resource requirements and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is duplicated across multiple UEs using dedicated resource partitions for each cooperating UE, then reliability of downlink transmission is improved, but resource consumption increases and scalability deteriorates
Solution Approach 1:
The patent merges multiple dedicated resource partitions into a single shared resource partition. Instead of allocating separate resources to each cooperating UE, all cooperating UEs share the same time-frequency resource partition to receive the downlink data, thereby reducing overall resource consumption while maintaining transmission reliability through group ID-based addressing.
Solution Approach 2:
The patent makes the single resource partition universal by allowing it to serve multiple cooperating UEs simultaneously. The resource partition is designed to be multi-functional, accommodating data reception for any number of cooperating UEs in the D2D group through the use of group ID masking and universal resource allocation indicators.
2Reliability
If data is duplicated across multiple UEs using dedicated resource partitions, then downlink transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent combines multiple UE-specific resource allocation mechanisms into a single group-based resource allocation mechanism. By merging the resource partitioning function, the system reduces the complexity of resource management while maintaining the ability to serve multiple cooperating UEs reliably.
Solution Approach 2:
The patent changes the addressing parameter from individual UE IDs to group ID. This parameter change simplifies the resource allocation signaling by using group ID masking on the physical downlink control channel, reducing the complexity of managing individual UE resource assignments while maintaining reliable delivery to all cooperating UEs.
3Reliability
If dedicated resource partitions are allocated to each cooperating UE, then transmission reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent merges multiple dedicated resource partitions into a single shared resource partition that is efficiently utilized by all cooperating UEs. This merging eliminates resource waste associated with dedicated partitions while maintaining reliable transmission through group-based addressing and shared resource access mechanisms.
Data Source
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AI summary
A network may have data to send to a target UE in a D2D group. It is desired to use the D2D group to help facilitate the downlink transmission of the data to the target UE. In one embodiment, control information in a downlink control channel is masked with a D2D group ID. UEs in the D2D group use the group ID to unmask the control information. The control information is used to locate and decode data in the downlink data channel that is meant for the target UE. Other UEs in the D2D group may forward the decoded data (or a re-encoded version of the decoded data or other information) to the target UE over a D2D channel.