Liu Tengfu

Bio: Liu Tengfu is an academic researcher from University of Science and Technology of China. The author has contributed to research in topics: Cellular network & Energy consumption. The author has an hindex of 1, co-authored 2 publications receiving 6 citations.

Towards Energy Optimization Based on Delay-Sensitive Traffic for WiFi Network

Abstract: To improve user experience, reducing energy consumption of a wireless device is an important factor. Several smartphones try to save energy by tearing down connections to the mobile network as soon as the data transmission has completed. However, the side effect is the frequent connection reestablishment in applications where small amounts data are sent and received, leading to a high energy overhead in the mobile network. This paper presents an optimization mechanism to buffer the network packages. The packages are classified according to the urgency of application, and then combined with the original Power Save (PS) mode mechanism of WiFi to dynamically regulate the data transmission. Therefore, urgent application data will be transmitted immediately while others would be delayed for different intervals. Our experiments show that the optimization mechanism can improve the network response time for the foreground application, reduce the energy consumption of WiFi for background application, as well as reduce the energy consumption for background application when the screen is locked.

Method for predicting utilization rate of processor, processing apparatus and terminal device

Abstract: Disclosed are a method for predicting a utilization rate of a processor, a processing apparatus and a terminal device. The method for predicting a utilization rate of a processor comprises: acquiring a utilization rate of each processor in at least one processor to be regulated and controlled in a first period of time, time for each processor in the processor to be regulated and controlled for processing a message in the first period of time and non-idle state time of each processor in the processor to be regulated and controlled in the first period of time; and according to a pre-set message processing threshold value, the utilization rate of each processor in the processor to be regulated and controlled in the first period of time, the time for each processor in the processor to be regulated and controlled for processing a message in the first period of time and the non-idle state time of each processor in the processor to be regulated and controlled in the first period of time, predicting the utilization rate of each processor in the processor to be regulated and controlled in a second period of time. The prediction on the utilization rate of the processor can be optimized.

Survey and Perspective on Extremely High Throughput (EHT) WLAN — IEEE 802.11be

Abstract: The IEEE 80211ax for Wireless Local Area Network (WLAN), one of the most important wireless networks, will be released in 2020 In recent years, ultra-high definition video service and real-time applications attract increasing attention Therefore, the next generation WLAN (beyond IEEE 80211ax): IEEE 80211be task group (TGbe) was formally established in 2019, which regards achieving extremely high throughput (EHT) as its core technical objective This article investigates and analyzes the key technologies of IEEE 80211be, and further provides our perspectives and insights on it Specifically, this article gives a brief overview on IEEE 80211be, including the target scenario and technical objective, key technologies overview, and the standardization process After that, we further investigate, analyze and provide perspectives on the key technologies of IEEE 80211be including multi-band operation, multi-AP coordination, enhanced link reliability, and latency & jitter guarantee To the best of our knowledge, this is the first work to investigate, analyze and provide insights on IEEE 80211be

Method for lowering wifi power consumption based on data importance

Abstract: The invention discloses a method for lowering wifi power consumption based on data importance, characterized in that the method includes the following steps: (1) based on the sensitivity to network data of an application which requests the network data, assessing the application which requests the network data, and determining a delayed sensitivity level of the application; (2) based on the delayed sensitivity level of the application, via a corresponding wifi power consumption optimization scheme, configuring a wifi network interface card for controlling the transmission of the network data. The method herein can reduce tail part energy consumption of the network interface card. The delay in waking up the network interface card can increase the time when the network interface card is in sleep mode.

Method for realizing energy consumption optimization of network requests of multiple applications based on reconstruction technology

Abstract: The invention relates to a method for realizing energy consumption optimization of network requests of multiple applications based on reconstruction technology. According to the method, binary byte codes of a mobile application are modified and reconstructed, and a network used by the binary byte nodes is replaced for operating a related application programming interface (API), thereby scheduling an original network operation, so that the reconstructed applications can transmit a network request together, thereby realizing a purpose of saving battery power of a mobile phone. According to the method of the invention, programmed analysis is performed on existing mobile applications; a computing logic which is related with network operation is found out and is correspondingly reconstructed; and finally the applications with schedulable network requests are regenerated. The method facilitates mobile phone duration time prolonging and particularly has an important meaning for a user with relatively large number of background applications and requirements for electric energy saving and normal background pushing.

Performance analysis system and method

Abstract: The invention relates to a performance analysis system and method. The system and method are used for analyzing the processing performance of a processing device. According to the performance analysissystem and method, a capture module is arranged within a processing device so as to capture a plurality of pieces of time information of each of the tasks in a unit circuit in the processing device within total execution time for processing the plurality of tasks; a calculation circuit performs interval analysis operation on the time information. The interval analysis operation comprises the following steps that: an overlapping period between a current task and a previous task is calculated; and time occupied by the unit circuit in the total execution time for processing the tasks by the processing device is put into statistics according to a relationship between the current time interval of the current task corresponding to the unit circuit and the overlapping period.

Delayed Wake-Up Mechanism Under Suspend Mode of Smartphone.

Abstract: In this paper, the impact of Suspend/Resume mechanism on the power consumption of smartphone is investigated. When the operating system (OS) is in suspend mode, many trivial (less urgent) network packets will always wake up system, making OS frequently switch from suspend mode to resume mode, thus causing a high power consumption. Based on this observation, an novel optimization mechanism was proposed to delay wake-up system and prolong the duration of suspend mode so as to reduce power consumption. This novel method not only reduces the power consumption of WiFi components, but also reduces the power consumption of the total components. To verify the effectiveness of the novel mechanisms, we implemented such proposed mechanism on Huawei P8 platform, and carried out relevant experiments. The results showed that the proposed mechanism can effectively decrease power consumption by more than 7.63%, which indicates the feasibility of the proposed mechanism.