NR eDRX Paging Scheduling for Uniform UE Distribution
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Solution Overview
Problem
Existing wireless communication systems, particularly in new radio (NR) systems, face inefficiencies in determining paging frames and occasions for user equipments (UEs) with extended discontinuous reception (eDRX) cycles longer than 10.24 seconds, leading to potential congestion and increased power consumption due to non-uniform distribution of UEs monitoring paging occasions.
Innovation Solution
The method involves calculating hyper system frame numbers and paging time windows based on unique bits of the UE identifier, separate eDRX cycles for idle and inactive states, and optimizing paging occasion determination to avoid congestion and reduce power consumption by ensuring overlapping paging time windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs monitor paging according to conventional DRX cycle formulas, then paging occasions can be determined, but non-uniform distribution of UEs monitoring paging occasions causes congestion
Solution Approach 1:
The patent segments the UE identifier into multiple parts, using different portions for determining different paging parameters. Specifically, it uses floor(UE_ID/N) mod Ns for paging occasion index and floor(UE_ID/N) for paging frame determination, thereby distributing UEs more uniformly across different paging occasions and reducing congestion at specific monitoring points.
Solution Approach 2:
The patent introduces new parameters for eDRX operation including eDRX cycle length, paging time window length, and offset values. By changing the determination formulas to use these new parameters (e.g., using eDRX cycle instead of regular DRX cycle, applying offset to paging frame calculation), the system achieves uniform UE distribution across extended DRX cycles while reducing congestion.
2Use of energy by moving object
If UEs with extended DRX cycles monitor paging occasions, then power consumption is reduced, but non-uniform distribution increases monitoring overhead
Solution Approach 1:
The patent segments the extended DRX cycle into multiple paging time windows, each containing specific paging occasions. By using segmented UE_ID calculations (floor(UE_ID/N) mod Ns for PO index, floor(UE_ID/N) for PF), it ensures uniform distribution of UEs across these windows, reducing the concentration of monitoring activities and thereby lowering overall monitoring overhead while maintaining power efficiency.
Solution Approach 2:
The patent introduces eDRX-specific parameters including extended DRX cycle length, paging time window offset, and modified paging occasion determination formulas. These parameter changes enable UEs to monitor paging less frequently while maintaining uniform distribution, thus reducing both power consumption and monitoring overhead simultaneously.
3Reliability
If conventional paging frame determination is used for eDRX, then paging can be monitored, but resource utilization is inefficient
Solution Approach 1:
The patent segments the paging monitoring function into multiple distributed paging time windows within the eDRX cycle. By calculating different paging frames and occasions for different UEs using segmented UE_ID formulas, it spreads monitoring activities uniformly across available time resources, improving resource utilization efficiency while maintaining reliable paging monitoring for all UEs.
Solution Approach 2:
The patent changes the paging determination parameters specifically for eDRX operation, introducing eDRX cycle length, paging time window offset, and modified formulas for paging frame and occasion calculation. These parameter changes enable more efficient utilization of time-frequency resources by uniformly distributing UE monitoring activities, thereby improving overall system productivity and resource utilization.
Data Source
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AI summary
A wireless communication method for use in a wireless device is disclosed. The method comprises determining a hyper system frame number of a paging hyper-frame for a wireless terminal in an extended discontinuous reception, DRX, cycle based on at least one bit of an identifier of the wireless terminal, wherein the at least one bit is different from bits used for determining at least one of a system frame number of a paging frame or a paging occasion for the wireless terminal in a DRX cycle.