VoLTE Terminal Power Reduction via SPS C-DRX Timing
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Solution Overview
Problem
Current wireless communication technologies face challenges in reducing power consumption, particularly in Voice over LTE (VoLTE) terminals, as dynamic scheduling is inefficient for real-time streaming applications like voice calls, leading to high overhead and increased battery usage.
Innovation Solution
Implementing semi-persistent scheduling (SPS) in connected discontinuous reception (C-DRX) mode, where the SPS transmit periodicity is adjusted to allow data transmission as soon as the UE wakes up during C-DRX On-Duration periods, reducing unnecessary power usage by aligning data transmission with the UE's wake-up times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dynamic scheduling is used for Voice over LTE terminals, then real-time voice communication can be supported, but power consumption increases due to high overhead and frequent wake-ups
Solution Approach 1:
The patent implements semi-persistent scheduling where the UE wakes up at periodic intervals during C-DRX On-Duration periods to transmit voice data. This periodic wake-up pattern reduces power consumption compared to dynamic scheduling by allowing the UE to sleep between predetermined intervals, while still maintaining real-time voice communication capability through the configured periodic transmission opportunities.
2Speed
If the UE wakes up frequently to check for data transmission opportunities, then data can be transmitted promptly, but battery life decreases
Solution Approach 1:
The network configures the UE with predetermined SPS parameters including periodicity and timing offsets before the UE enters C-DRX mode. This preliminary configuration allows the UE to wake up only at predetermined intervals rather than frequently checking for scheduling opportunities, reducing wake-up frequency while maintaining timely data transmission capability within each C-DRX cycle.
3Use of energy by moving object
If semi-persistent scheduling is implemented with fixed periodicity, then power consumption is reduced, but flexibility in adapting to varying voice traffic patterns is limited
Solution Approach 1:
The patent introduces dynamic adjustment mechanisms where the SPS periodicity and timing parameters can be modified based on voice traffic conditions. The network can update SPS configurations to increase or decrease periodicity according to whether the voice call is in active speech or silence periods, allowing the system to adapt to varying traffic patterns while maintaining lower power consumption compared to pure dynamic scheduling.
Data Source
AI summary
A connection with a network that includes a base station (BS) may be established by a user device (UE) via a wireless connection, for conducting communications using semi persistent scheduling (SPS) in a connected discontinuous reception (C-DRX) mode. The SPS transmit periodicity may be adjusted with respect to the SPS activation command and the SPS interval UL (for uplink). Data may then be transmitted during the C-DRX On-Duration periods according to the determined SPS transmit periodicity. In some embodiments, the SPS transmit periodicity is adjusted such that following a first C-DRX On-Duration period when an SPS activation command is received, SPS data transmission occurs a specified number of subframes earlier during each subsequent C-DRX On-Duration period than in the first C-DRX On-Duration period. The SPS data transmission in each subsequent C-DRX On-Duration period may take place as soon as the UE device wakes up during the On-Duration period.