Sidelink Grant Processes for Parallel Group Communication
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Solution Overview
Problem
Existing LTE systems face challenges in efficiently managing radio resource allocation for device-to-device (D2D) communication, particularly in scenarios requiring high data rates and low latency, due to limitations in bandwidth and interference management.
Innovation Solution
A method for allocating radio resources for direct sidelink communication between user equipment (UEs) using at least two sidelink grant processes within a transmission control period, allowing for efficient utilization of available bandwidth and reducing interference through optimized scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single sidelink grant process is used for D2D communication, then device complexity is reduced, but productivity decreases due to inability to handle multiple destination groups simultaneously
Solution Approach 1:
The patent divides the sidelink grant management into multiple independent grant processes (first sidelink grant process and second sidelink grant process), each handling different destination groups. This segmentation allows parallel processing of multiple D2D communications without increasing overall system complexity, thereby improving productivity.
Solution Approach 2:
The patent introduces a new dimension of grant process identification by adding a grant process ID field to the sidelink grant structure. This additional dimension enables the system to distinguish and manage multiple grant processes simultaneously, allowing multiple destination groups to be handled in parallel while maintaining organized control.
2Productivity
If multiple sidelink grants are handled in the same transmission control period, then productivity increases through parallel communications, but device complexity increases due to grant process management
Solution Approach 1:
The patent performs preliminary action by allocating and identifying multiple sidelink grant processes before the transmission control period begins. Each grant process is pre-configured with its own ID and associated parameters, enabling the system to handle multiple grants efficiently during the transmission period without creating scheduling conflicts or excessive complexity.
Solution Approach 2:
The grant process ID acts as an intermediary that mediates between multiple sidelink grants and the transmission control period. This intermediary structure allows the system to manage multiple grants by routing them through distinct process identifiers, simplifying the scheduling complexity while maintaining high resource utilization.
3Productivity
If bandwidth is increased to support multiple destination groups, then productivity improves, but interference management becomes more difficult
Solution Approach 1:
The patent segments the available bandwidth into multiple dedicated resources, each assigned to a specific sidelink grant process and destination group. This segmentation prevents interference between different D2D communications by ensuring that each process operates on its own allocated resources, thereby maintaining high transmission capacity without increasing interference.
Data Source
AI summary
A method allocates radio resources for a transmitting user equipment (UE) to perform direct communication transmissions over a direct sidelink connection to one or more receiving UEs. At least two sidelink grant processes are provided in the transmitting UE for the transmitting UE to handle at least two sidelink grants within the same transmission control period. Each one of the sidelink grant processes is associated with an identification and can be associated with one sidelink grant. The transmitting UE acquires at least two sidelink grants and associates each of the acquired sidelink grants with one sidelink grant process. For each sidelink grant, the transmitting UE allocates radio resources according to the respective sidelink grant to perform a direct communication transmission of sidelink control information and of data over the direct sidelink connection. The transmitting UE performs a direct communication transmission per acquired sidelink grant within the same transmission control period.