Combined usage of wireless air interfaces
Here we present results of measurements of power consumption when using several air interfaces for downloading/uploading data.
Experiment details
Description: | Measurements of power consumption using several air interfaces for downloading/uploading data. |
Place: | Indoor |
Technology used: | IEEE 802.11b/g, Bluetooth 2.0+EDR |
Number of tests: | 20 |
Notes: | During the measurements all the "not required" air interfaces are switched off. |
We have conducted several tests for different scenarios and results are shown in the Figure below. Bluetooth communication is using RFCOMM as communication protocol, whereas cellular and WLAN are using TCP/IP.
- WLAN+ UMTS + Bluetooth: In tests for this scenario we measured the power consumption when sending and receiving data using Bluetooth, while downloading a file with GPRS. WLAN card is switched off.
- UMTS + Bluetooth: In tests for this scenario we measured the power consumption when sending and receiving data using Bluetooth, while downloading a file with WLAN. The phone was in offline mode, therefore the Cellular air interface is switched off.
- WLAN + Bluetooth: In tests for this scenario we measured the power consumption when sending and receiving data using Bluetooth, while downloading a file with UMTS. WLAN card is switched off.
- GPRS + Bluetooth: In tests for this scenario we measured the power consumption when sending and receiving data using Bluetooth, while downloading a data using both UMTS and WLAN.
- Power consumption for exchange data using different wireless technologies.
Parametrized model
Energy = P_action * Duration
| Action | P_action [mW] |
|---|---|
WLAN+ UMTS + Bluetooth rx | 2060 |
UMTS + Bluetooth tx | 1623 |
UMTS + Bluetooth rx | 1527 |
WLAN + Bluetooth tx | 1120 |
WLAN + Bluetooth rx | 1089 |
GPRS + Bluetooth tx | 1091 |
GPRS + Bluetooth rx | 974 |