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

Department of Electronic Systems | Aalborg University | Niels Jernes Vej 12 | DK-9220 Aalborg | Denmark
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Last update:20-07-2011