Dynamic Sidelink Resource Allocation for NR V2X
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Solution Overview
Problem
Current sidelink resource allocation techniques for Vehicle-to-Everything (V2X) in New Radio (NR) mobile communications are limited in supporting unicast, groupcast, and broadcast transmissions, as well as periodic and aperiodic traffic patterns, and do not adequately address low-latency and high-reliability requirements.
Innovation Solution
A method involving a processor in a User Equipment (UE) that receives signaling from a network node to configure sidelink resources, transmits packets, and dynamically reconfigures resources upon decoding failures, switching between network-controlled and UE-autonomous modes for resource allocation, utilizing dynamic grants, Type-1 Grant-Free, and Type-2 Semi-Persistent Scheduling techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE V2X uses semi-persistent scheduling for resource allocation, then resource allocation is simplified, but it only supports broadcast transmission and periodic traffic patterns, lacking support for unicast, groupcast, and aperiodic traffic
Solution Approach 1:
The patent implements a universal resource allocation mechanism that can handle multiple transmission types (unicast, groupcast, broadcast) and traffic patterns (periodic, aperiodic) through a single framework. The gNB configures resource pools with flexible parameters that can be adapted to different transmission scenarios, allowing one system to serve multiple functions without requiring separate dedicated mechanisms for each type.
Solution Approach 2:
The patent introduces dynamic resource allocation where the gNB can modify resource pool configurations in real-time based on traffic characteristics. The system dynamically adjusts parameters such as time resources, frequency resources, and scheduling parameters to match actual transmission needs, enabling the system to transition between different transmission modes and traffic patterns flexibly.
2Reliability
If dynamic grants are used for resource allocation, then reliability is improved through network control, but signaling overhead increases and latency increases
Solution Approach 1:
The patent implements preliminary resource configuration where the gNB pre-configures resource pools with multiple preallocated time and frequency resources before actual transmission occurs. This allows the UE to have ready-to-use resource configurations that can be activated immediately, eliminating the need for real-time dynamic grants while maintaining network control over the allocated resources.
Solution Approach 2:
The patent extracts the time-critical resource allocation function from the signaling-based dynamic grant mechanism. By pre-configuring resource pools and using semi-persistent scheduling, the system separates the configuration phase (handled by network control) from the execution phase (handled by preallocated resources), thereby removing the latency and overhead associated with real-time dynamic grants while preserving reliability.
3Loss of time
If Type-1 Grant-Free resource allocation is used, then latency is reduced, but link adaptation capability is limited compared to dynamic grants
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors transmission outcomes and can request resource reconfiguration from the gNB based on actual channel conditions. This feedback loop enables the system to adapt link parameters such as modulation and coding scheme dynamically, combining the low latency of grant-free allocation with the adaptability of network-controlled scheduling.
Solution Approach 2:
The patent allows dynamic modification of link adaptation parameters within the resource pool configuration. The gNB can change parameters such as MCS, resource pool size, and allocation patterns based on feedback information, enabling the system to maintain low latency while achieving effective link adaptation through parameter adjustments rather than requiring full dynamic grant procedures.
4Reliability
If network-controlled resource allocation is used, then reliability is improved, but UE autonomy and flexibility are reduced
Solution Approach 1:
The patent segments resource allocation into two distinct modes: network-controlled mode for high-reliability scenarios where the gNB manages resource pools, and UE-autonomous mode for flexible scenarios where preconfigured resources are used independently. This segmentation allows the system to select the appropriate mode based on operational requirements, balancing reliability and autonomy without forcing a single approach.
Solution Approach 2:
The patent introduces dynamic mode switching capability where the UE can transition between network-controlled and autonomous operation based on real-time conditions. The system dynamically adjusts the level of network involvement in resource allocation, allowing maximum autonomy when conditions permit and network control when reliability is critical, thereby optimizing both parameters simultaneously.
Data Source
AI summary
Various examples and schemes pertaining to sidelink resource allocation for vehicle-to-everything (V2X) in New Radio (NR) mobile communications are described. An apparatus implemented in a first user equipment (UE) receives a first signaling from a network node of a wireless network, with the first signaling configuring a first sidelink resource for a sidelink between the first UE and a second UE. The apparatus transmits a packet or transport block (TB) to the second UE on the sidelink using the configured first sidelink resource. The apparatus also receives a second signaling from the network node responsive to the second UE failing to decode the packet or TB, with the second signaling dynamically configuring a second sidelink resource for the sidelink. The apparatus then retransmits the packet or TB to the second UE on the sidelink using the dynamically configured second sidelink resource.