Service-Specific Paging for Low-Power Side-Link Communications
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Solution Overview
Problem
Current side-link communication technologies, such as LTE and 5G NR, face challenges in power efficiency and resource management, particularly for power-limited devices that need to monitor and decode multiple side-link control channels, leading to unnecessary wake-ups and increased power consumption.
Innovation Solution
The implementation of a service-specific and dynamic side-link paging method that allows devices to sleep until specific paging occasions, using a combination of code division multiplexing and sensing-based channel access to share resources and reduce unnecessary decoding, with relay offloading and synchronization methods to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices monitor and decode multiple side-link control channels continuously, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where devices alternately sleep and wake to monitor paging occasions. During DRX sleep periods, devices turn off their receivers to save power, while during DRX active periods, they monitor for paging messages. This periodic monitoring pattern maintains communication reliability by ensuring devices check for messages at regular intervals while dramatically reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent segments the monitoring duty by dividing time into distinct paging occasions and non-paging periods. Instead of monitoring all control channels continuously, devices are configured to monitor only specific paging occasions for service-specific paging messages. This segmentation allows devices to remain in low-power states between paging occasions while still reliably receiving important communications.
2Reliability
If devices wake up frequently to check for paging messages, then message reception reliability is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent uses service-specific paging occasions configured with DRX parameters that define periodic wake-up intervals. Devices wake up only at their assigned paging occasions to check for messages related to specific services, then return to sleep mode. This periodic action ensures reliable message reception for each service while minimizing wake-up frequency to improve energy efficiency.
Solution Approach 2:
The patent implements service-specific paging where different services have different paging occasions and DRX configurations tailored to their requirements. Critical services may have more frequent paging occasions with shorter DRX cycles, while less critical services use longer intervals. This local quality approach ensures each service receives appropriate attention for reliable message delivery while optimizing overall energy efficiency across multiple services.
3Reliability
If multiple paging occasions are configured for different services, then service-specific communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments paging monitoring by service, creating separate paging occasions for different services. Each service has its own configured paging occasion pattern with specific DRX parameters. Devices maintain separate DRX configurations for each service, allowing them to monitor only relevant paging occasions for each service type. This segmentation improves service-specific reliability while managing device complexity through organized, service-based monitoring structures.
Solution Approach 2:
The patent uses a universal DRX framework that can be instantiated multiple times with service-specific parameters. The same DRX mechanism and paging occasion structure are reused across different services, with each service having its own configured parameters. This multi-functionality approach allows the system to support multiple services with different requirements using a single unified mechanism, improving service-specific reliability without proportionally increasing device complexity.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products directed to low-power proximity-based service paging for multi-carrier side-link (SL) communications are described. A first wireless transmit and receive unit (WTRU) may receive, from a second WTRU a request message indicating a set of SL monitoring occasions to be monitored, wherein the set of SL monitoring occasions may be associated with a SL service. The first WTRU may receive one or more transmissions indicating whether the second WTRU is being paged for the SL service. On a condition that the second WTRU is being paged for the SL service, the first WTRU may receive one or more SL messages associated with the SL service and directed to the second WTRU. The first WTRU may transmit to the second WTRU, SL paging information indicating availability of the received one or more SL messages.