Baseband Processing Power Savings in 3GPP TDD Full DTX
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Solution Overview
Problem
In 3GPP Time Division Duplex (TDD) systems, especially during full discontinuous transmission (DTX) mode, mobile devices consume significant power by continuously processing frames for the possibility of special bursts and data transmission, even when no data is transmitted, leading to inefficient power usage.
Innovation Solution
The solution involves turning off baseband processing for unused codes and timeslots during full DTX by synchronizing data transmission with Special Burst Scheduling Period (SBSP) frames, allowing the receiver to remain off during idle periods and initiating transmissions only at SBSP boundaries, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver continuously processes frames to detect special bursts and data transmission during full DTX mode, then the reliability of data reception is improved, but the power consumption increases significantly
Solution Approach 1:
The receiver operates periodically by turning on only at SBSP frame boundaries to check for special bursts or data transmission, and turning off during intermediate frames. This periodic operation pattern allows the mobile device to maintain reliable detection capability while significantly reducing power consumption during full DTX mode, directly resolving the contradiction between continuous monitoring reliability and energy efficiency
2Use of energy by moving object
If the receiver turns off during idle periods to save power, then power consumption is reduced, but the ability to detect data transmission start is delayed
Solution Approach 1:
The transmitter is synchronized to initiate data transmission exactly at SBSP frame boundaries, which are the same time points when the receiver turns on to check for activity. This preliminary coordination ensures that the receiver is always active at the precise moment data transmission begins, eliminating detection delay while allowing the receiver to remain off during intermediate frames for power savings
Data Source
AI summary
A system and method that achieve power savings by turning off all or some of the baseband processing for codes and timeslots that have not been transmitted due to full DTX. When full DTX is detected by reception of a Special Burst (SB), the receiver is turned off for all timeslots and frames for the duration of the Special Burst Scheduling Period (SBSP). The transmitter schedules transmissions following any idle period to start on the boundary of the SBSP. The receiver determines the SBSP and if the transmitter initiates transmissions according to SBSP by reception of several initial full DTX cycles.