CDRX Offset Tuning for Periodic Traffic Jitter in XR

Solution Overview

Problem

Wireless communication systems face challenges in managing connected mode discontinuous reception (CDRX) settings for periodic traffic with jitter, leading to increased latency and power consumption due to mismatched traffic arrival times, especially in extended reality (XR) applications like SplitXR, where jitter causes UEs to wake up too early or too late for downlink transmissions.

Innovation Solution

A network entity adjusts CDRX configuration parameters by estimating traffic arrival times, including jitter, to calculate a CDRX offset value, which aligns the UE's wake-up window with actual traffic arrival times, reducing latency and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE wakes up periodically to check for downlink transmissions, then the UE can receive periodic traffic, but the UE wakes up too early or too late due to jitter causing increased latency and power consumption

Engineering Contradiction:

Improvetraffic reception reliabilityVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network entity performs preliminary estimation of traffic arrival times including jitter compensation before configuring the CDRX parameters. By calculating the expected traffic arrival offset in advance and setting the CDRX wake-up time accordingly, the UE is positioned to wake up at the optimal moment to receive traffic, avoiding both early and late wake-ups that waste time and energy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The CDRX configuration parameters, specifically the CDRX offset value and periodicity, are dynamically adjusted based on estimated traffic arrival patterns and jitter characteristics. By changing these parameters to match the actual traffic arrival timing, the system achieves reliable reception while minimizing latency and power consumption.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the UE wakes up periodically to check for downlink transmissions, then the UE can receive periodic traffic, but the UE consumes excessive power due to mismatched wake-up times

Engineering Contradiction:

Improvetraffic reception reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network entity performs preliminary estimation of traffic arrival times including jitter compensation before configuring the CDRX parameters. By calculating the expected traffic arrival offset in advance and setting the CDRX wake-up time accordingly, the UE is positioned to wake up at the optimal moment to receive traffic, avoiding both early and late wake-ups that waste time and energy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The CDRX configuration parameters, specifically the CDRX offset value and periodicity, are dynamically adjusted based on estimated traffic arrival patterns and jitter characteristics. By changing these parameters to match the actual traffic arrival timing, the system achieves reliable reception while minimizing latency and power consumption.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the network uses fixed CDRX configuration, then the configuration is simple, but it cannot adapt to jitter in traffic arrival times

Engineering Contradiction:

ImproveCDRX configuration complexityVSAvoidjitter adaptation capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The CDRX configuration transitions from a static fixed pattern to a dynamic adaptive pattern. The network entity continuously estimates traffic arrival times and jitter characteristics, then adjusts the CDRX offset and periodicity parameters accordingly. This dynamic adaptation allows the system to handle varying traffic patterns and jitter while maintaining reasonable configuration complexity through automated estimation and adjustment processes.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements a feedback mechanism where the network entity monitors actual traffic arrival times, estimates jitter characteristics, and uses this information to adjust CDRX configuration parameters. This closed-loop approach enables the system to adapt to changing conditions while maintaining optimal performance without requiring complex manual configuration.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12513775B2Connected mode discontinuous reception settings for periodic traffic with jitter

Publication Date: 2025.12.30 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A network entity may account for jitter in communications with a user equipment (UE) by adjusting connected mode discontinuous reception (CDRX) configuration parameters for the UE based on estimated downlink traffic arrival times. For a downlink traffic burst, the network entity may estimate a traffic arrival offset based on determining a traffic periodicity, an estimated arrival time associated with one or more packets of a traffic burst, and at least one jitter parameter. The jitter parameter may represent an uncertainty in the arrival time of the traffic burst. The network entity may select a CDRX offset value based on the estimated traffic arrival offset. The network entity may transmit (e.g., to a UE, such as an extended reality (XR) device) a message indicating the CDRX offset value, for example, as part of a CDRX configuration.