Sidelink Resource Grant Coordination for Interference Reduction
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Solution Overview
Problem
In wireless communication systems, the coexistence of user equipment (UE) with shared resource pools leads to issues such as contention and interference due to overlapping resource allocations, particularly between Mode 3 and Mode 4 UEs, which have different resource allocation methods and priorities.
Innovation Solution
A method where a UE determines whether to request a new grant for sidelink channel resources based on interfering transmissions, measured energy thresholds, and configuration information from the base station, allowing for decentralized resource allocation and reducing interference by adjusting its transmission according to detected interference and priority levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Mode 3 and Mode 4 UEs share the same resource pool for D2D communication, then resource utilization efficiency is improved, but interference and contention between different UE types increase
Solution Approach 1:
The patent segments the shared resource pool into different portions or assigns different resource allocation rules for Mode 3 and Mode 4 UEs. The base station configures Mode 3 UEs with specific resource pools while Mode 4 UEs autonomously select from remaining resources, dividing the resource space to reduce overlap and interference while maintaining overall sharing benefits.
Solution Approach 2:
The patent applies different resource allocation qualities or characteristics to different UE types within the shared pool. Mode 3 UEs receive network-controlled allocations with specific QoS guarantees, while Mode 4 UEs operate with autonomous selection mechanisms, creating localized resource characteristics that reduce contention while maintaining efficient utilization.
2Adaptability or versatility
If Mode 4 UEs autonomously allocate resources without base station coordination, then resource allocation flexibility is improved, but base station awareness of resource usage decreases
Solution Approach 1:
The patent implements feedback mechanisms where Mode 4 UEs report their autonomous resource selections and transmission status to the base station. This feedback loop allows Mode 4 UEs to maintain allocation flexibility while keeping the base station informed, enabling the network to coordinate resources and prevent interference without restricting autonomous operation.
Solution Approach 2:
The patent introduces an intermediary reporting mechanism between Mode 4 UEs and the base station. Mode 4 UEs autonomously allocate resources but use scheduling requests or uplink control channels to inform the base station of their resource usage, acting as an intermediary that preserves autonomy while maintaining network awareness.
3Reliability
If Mode 3 UEs are coordinated by base station for resource allocation, then resource allocation control is improved, but response time for dynamic resource needs increases
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure resource pools and allocation parameters for Mode 3 UEs in advance. This preliminary setup provides reliable control while reducing real-time coordination overhead, allowing UEs to quickly access pre-approved resources when dynamic needs arise without requiring extensive real-time negotiation.
Solution Approach 2:
The patent introduces dynamics by allowing Mode 3 UEs to transition between network-coordinated allocation and autonomous selection based on traffic conditions. When dynamic resource needs arise, UEs can request additional autonomous access within configured parameters, combining reliable control with fast response capability.
Data Source
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AI summary
According to one aspect of the disclosure, a first method, a first computer-readable medium, and a first apparatus are provided. The first apparatus may be a UE. The first apparatus may receive, from a base station, a first grant associated with a first set of resource available to the first apparatus for transmission on a first sidelink channel. The first apparatus may determine whether to request, from the base station, a second grant associated with a second set of resources available to the first apparatus for transmission on the first sidelink channel. The first apparatus may send, to the base station, a request for the second grant when determining to request the second grant. Further, the first apparatus may send information on the first sidelink channel based on the first grant when determining not to request the second grant.