VoLTE Uplink-Downlink Synchronization for Power Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
VoLTE terminals face challenges in efficiently saving power due to the need for continuous synchronization between uplink and downlink data transmission and reception, even when only one direction of data transfer is active, limiting power-saving capabilities despite the application of CDRX and SPS schemes.
Innovation Solution
An electronic device and method for VoLTE user equipment that adjusts operation synchronization between uplink and downlink channels to maximize idle periods by determining a download schedule based on downlink channel information and transmitting voice data over the uplink channel based on the required grant time, thereby overlapping upload and download periods to extend idle periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If CDRX and SPS schemes are applied to reduce power consumption, then power saving is improved, but uplink-downlink synchronization cannot be achieved, limiting further power saving potential
Solution Approach 1:
The patent dynamically adjusts uplink transmission timing based on downlink reception timing and grant processing delays. The terminal calculates the difference between downlink reception time and uplink transmission time, and adjusts the uplink timing accordingly to achieve synchronization while maintaining idle periods for power saving.
Solution Approach 2:
The patent changes the timing parameter of uplink transmission by introducing a timing adjustment value (TIMING_ADJUSTMENT) that compensates for processing delays. This parameter adjustment enables the terminal to synchronize uplink and downlink operations while preserving idle periods established by CDRX and SPS schemes.
2Productivity
If terminal performs only one direction of data transfer (upload or download), then data transmission efficiency is improved, but both uplink and downlink modules must operate, increasing power consumption
Solution Approach 1:
The patent implements periodic idle periods within the CDRX cycle where both uplink and downlink modules can be deactivated. By synchronizing uplink transmission timing with downlink reception timing, the terminal creates regular intervals where no transmission or reception occurs, allowing both modules to enter low-power states simultaneously.
3Reliability
If terminal monitors downlink channel continuously to maintain synchronization, then connection reliability is improved, but power consumption increases
Solution Approach 1:
The patent extracts the essential synchronization function from continuous monitoring by only monitoring downlink control channels at specific timing points relevant to uplink transmission. The terminal monitors PDCCH for grant messages at calculated timing instances rather than continuously, maintaining necessary connection reliability while reducing power consumption during idle periods.
Data Source
AI summary
An electronic device for providing a packet-based voice call function is provided. The electronic device includes a transmit antenna; a receive antenna; and a communication circuit configured to establish an uplink channel using the transmit antenna, establish a downlink channel using the receive antenna, perform a packet-based voice call using the uplink channel and the downlink channel, obtain information associated with the downlink channel, determine a download schedule based on the obtained information associated with the downlink channel, determine a time required from a transmission request to a base station to a grant time, and transmit a voice packet over the uplink channel based on the download schedule and the time required from the transmission request to the base station to a grant time.