Sidelink DRX Offset Alignment for Low-Latency XR Transmissions
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Solution Overview
Problem
Wireless communications systems face challenges in managing sidelink transmissions for low latency and high reliability services like extended reality (XR) and ultra-reliable low latency communications (URLLC), due to mismatches between network-configured discontinuous reception (DRX) cycles and the periodicity of XR traffic, leading to jitter and missed receptions.
Innovation Solution
UEs determine high priority levels for sidelink transmissions based on remaining packet delay budgets and indicate resource pool reservations in SCI messages, adjust DRX cycles with offsets, and configure different RSRP thresholds for XR and URLLC to ensure timely and reliable communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If network-configured DRX cycles are used for sidelink monitoring, then power consumption is reduced through discontinuous reception, but jitter and missed receptions occur due to mismatch between DRX cycle periodicity and XR traffic periodicity
Solution Approach 1:
The patent applies dynamics by making the DRX cycle configurable and adaptable to match XR traffic periodicity. The network can configure different DRX cycle lengths (e.g., 16.67ms for 60fps XR) and apply offsets to align monitoring occasions with actual transmission times, allowing the reception pattern to dynamically adapt to the specific periodicity requirements of XR content rather than using fixed static cycles.
Solution Approach 2:
The patent changes key parameters of the DRX mechanism including cycle length, offset values, and monitoring occasion timing to match XR traffic characteristics. By adjusting these parameters, the system transforms the rigid network-configured DRX into a flexible mechanism that can be tuned to specific XR application requirements, resolving the mismatch between monitoring rhythm and traffic rhythm.
2Reliability
If resource pools are reserved for high priority low latency traffic like XR and URLLC, then latency and reliability are improved, but other lower priority communications suffer from resource preemption
Solution Approach 1:
The patent applies local quality by allocating different quality levels of resource access to different traffic types. High priority traffic (XR, URLLC) gets guaranteed reserved resources with preemptive access rights, while lower priority traffic uses remaining resources. This creates localized quality differentiation where critical services receive premium resource treatment while best-effort services use standard resources, resolving the conflict between reliability for specific services and overall productivity.
Solution Approach 2:
The patent segments the resource pool into reserved portions for high priority traffic and available portions for other traffic. By dividing the resource space and time into dedicated segments for XR/URLLC and general traffic, the system ensures that critical services have guaranteed resources while other services can utilize remaining capacity, preventing complete resource contention and maintaining overall system productivity.
3Device complexity
If DRX cycle is kept fixed by network configuration, then network control and simplicity are maintained, but flexibility to match varying XR traffic periodicities is lost
Solution Approach 1:
The patent introduces dynamics into the previously static DRX configuration by enabling network-configurable parameters that can be adjusted based on XR traffic characteristics. The system transitions from a fixed simple configuration to a dynamically adaptable one where the network can set appropriate cycle lengths and offsets for different XR applications, maintaining relative simplicity while gaining flexibility.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Sidelink communications between user equipments (UE)s may include services that demand low latency and high reliability, such as extended reality (XR) and ultra-reliable low latency communications (URLLC). Given the latency demands for XR and URLLC, XR and URLLC may be higher priority than other communications types. A UE may determine that data for transmission over sidelink has a high priority level based on a remaining packet delay budget associated with the data. UEs may monitor for sidelink transmissions in accordance with network configured discontinuous reception (DRX) cycles. The DRX cycles configured by the network for sidelink communications, however, may not match with the periodicity of XR traffic. For XR communications, the transmitting UE may indicate an offset to apply to a DRX cycle such that the receiving UE may adjust the DRX cycle to match the periodicity of the XR communications.