PDCP Duplication With Cooperative Configured Grant Slot Alignment
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Solution Overview
Problem
Existing configured grant and PDCP duplication methods result in inefficient spectrum use and high energy consumption due to static and manual cell-level configurations, leading to increased latency and battery drain in ultra-reliable low-latency communications (URLLC) scenarios.
Innovation Solution
A cooperative approach is implemented where neighboring cells align their physical resource blocks and time slots for configured grants, optimizing slot selection based on UE conditions to reduce energy consumption and latency, ensuring packet reliability through coordinated PDCP duplication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP duplication is employed to ensure data integrity, then packet reliability is improved, but energy consumption increases due to simultaneous connection to multiple cells
Solution Approach 1:
The patent applies dynamics by making the configured grant slots dynamic and adjustable rather than static. The network device can dynamically configure different time slots for different cells, allowing the system to adapt transmission timing to actual channel conditions and traffic patterns, thereby reducing unnecessary wake-ups and energy consumption while maintaining reliability
Solution Approach 2:
The patent changes the parameter of time slot configuration for configured grants across different cells. By adjusting the time slot parameters dynamically based on channel conditions and traffic requirements, the system optimizes the balance between packet reliability and energy consumption, avoiding simultaneous transmissions that cause unnecessary energy drain
2Ease of manufacture
If configured grant and PDCP duplication resources are statically configured, then setup simplicity is improved, but spectral efficiency deteriorates due to inefficient resource use
Solution Approach 1:
The patent transforms static resource configuration into dynamic configuration. The network device can dynamically adjust configured grant resources and PDCP duplication parameters based on real-time channel conditions and traffic patterns, significantly improving spectral efficiency while maintaining operational simplicity through automated management
Solution Approach 2:
The patent implements feedback mechanisms where the network device monitors channel conditions and traffic patterns, then adjusts configured grant and PDCP duplication resources accordingly. This closed-loop approach enables automatic optimization of spectral efficiency without increasing configuration complexity for users
3Loss of time
If configured grant allocates predefined PRBs periodically, then transmission latency is reduced, but resource flexibility deteriorates due to rigid allocation
Solution Approach 1:
The patent makes configured grant resources dynamic by allowing the network device to adjust time slots, frequency resources, and other parameters based on real-time conditions. This dynamic approach maintains the low-latency benefit of pre-allocation while adding the flexibility to adapt to changing traffic patterns and channel conditions
4Reliability
If UE wakes up for each communication of the same packet in multiple cells, then packet delivery reliability is improved, but battery life deteriorates due to increased wake-up frequency
Solution Approach 1:
The patent applies dynamics by enabling the network to dynamically configure different time slots for configured grants in different cells. This allows the system to coordinate transmissions so that the UE does not need to wake up simultaneously for all cells, reducing wake-up frequency and energy consumption while maintaining packet delivery reliability through coordinated multi-cell transmission
Data Source
AI summary
The technology described herein is directed towards cooperative configured grant with respect to the configured grant timeslots of multiple cells, particularly for ultra-reliable low latency communications (URLLC) devices configured for packet data convergence protocol (PDCP) for duplicate packet communications. Selection of slots is delay aware with respect to PDCP communications. By selecting a first serving cell's configured grant physical resource block (PRB) time slots in a timing alignment with a second cell's configured grant PRB time slots, end-to-end PDCP delay is reduced for duplicate communications between a user equipment communicating with the first cell and the second cell for PDCP duplication. Multiple UEs can be prioritized based on their current condition data with respect to slot assignment. Also described is a controller proposing a different configuration of configured grant slots, which the controller can then use if accepted by the deciding entity.