Sidelink Resource Allocation Mode 1 and Mode 2 Simultaneous Operation
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Solution Overview
Problem
Current sidelink resource allocation mechanisms in wireless networks, particularly in Mode 2, face issues such as power inefficiency, unused resources, and potential traffic collisions due to hidden nodes, which affect the reliability and latency of sidelink communications.
Innovation Solution
The implementation of simultaneous Mode 1 and Mode 2 resource allocation allows UEs to dynamically select between resource allocation modes based on QoS requirements and radio conditions, using a MAC entity to manage grants and handle potential collisions and overlaps by prioritizing logical channels and adjusting power allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If Mode 2 resource allocation is used for sidelink communications, then distributed resource allocation and autonomy are improved, but power efficiency deteriorates and resource utilization worsens
Solution Approach 1:
The patent implements dynamic resource allocation mode selection, where the UE can switch between Mode 1 (network-controlled) and Mode 2 (autonomous) resource allocation based on QoS requirements and radio conditions. This dynamic adaptability allows the system to optimize power efficiency by using network-controlled allocation when needed while maintaining autonomous operation capabilities, thereby resolving the contradiction between automation extent and power efficiency.
2Adaptability or versatility
If Mode 2 resource allocation is used for sidelink communications, then distributed control is improved, but resource utilization deteriorates due to unused resources
Solution Approach 1:
The patent enables dynamic switching between centralized (Mode 1) and distributed (Mode 2) resource allocation modes. The network can control resource allocation dynamically based on traffic conditions, ensuring that resources are properly utilized and not left unused. This resolves the contradiction by allowing distributed control when appropriate while maintaining the ability to use centralized control for optimal resource utilization.
3Extent of automation
If Mode 2 resource allocation is used for sidelink communications, then autonomy is improved, but reliability deteriorates due to potential traffic collisions from hidden nodes
Solution Approach 1:
The patent implements dynamic mode selection where the system can switch between autonomous Mode 2 operation and network-controlled Mode 1 operation. When collision risk is detected or QoS requirements demand higher reliability, the system can transition to Mode 1 where the network coordinates resource allocation to avoid collisions from hidden nodes, thereby maintaining autonomy when safe while ensuring reliability when needed.
Solution Approach 2:
The patent incorporates feedback mechanisms where the network monitors sidelink communication conditions and can trigger mode transitions. The network receives information about collision risks and QoS requirements, then provides feedback by adjusting the resource allocation mode accordingly. This feedback loop ensures that autonomous operation continues when reliable while switching to controlled operation when collisions are detected, resolving the contradiction between autonomy and reliability.
Data Source
AI summary
A wireless User Equipment (UE) may indicate to a base station (gNB) that the UE is capable of simultaneously using sidelink resource allocations Mode 1, with scheduling by the gNB, and sidelink resource allocation Mode 2 with scheduling by the UE, and then receive from the gNB, a Medium Access Control (MAC) entity configuration comprising information for Mode 1 and for Mode 2, and Sidelink Radio Bearer (SERB) configurations which may include the mode (Mode 1 or Mode 2) for the SERB. The UE may determine grants for both modes. In case of a grant collision or overlap, the UE may use logical channel priority to select one grant over the other. The UE may change from one mode to another. The MAC entity may take actions related to feedback, BSR reporting, and SR reporting, to manage the transitions.