Device dynamic total RF power compensation
A system and method may dynamically control the total RF power emissions of a mobile device. The method may include determining the local RF operating situation of the mobile device; setting a maximum power limit according to the local RF operating situation; and/or adjusting an active transmitted power of the mobile device within the maximum power limit. The local RF operating situation may be determined based upon (1) the measuring of a matching of the mobile device's radio antenna(s); (2) currently active application(s); (3) the number/type of active radios; (4) frequency or wavelength of transmissions; (5) network, relay, or node RF operating or exposure conditions; and/or (6) a power control process. The mobile device may be a hand-held device, HomeNodeB, or other device capable of RF communications. The local RF operation situation and/or available headroom may be communicated to a network base station or node to facilitate enhanced mobile device performance.
1. A method of dynamically controlling the total RF power emissions of a mobile device, the method comprising:
determining which applications are currently active at the mobile device;
measuring a matching of one or more mobile device active radio antennas to determine a proximity of a user to the mobile device;
setting a maximum power limit of the mobile device according to the the applications that are currently active and the proximity of the user using a table stored at a memory of the mobile device, the table comprising a list of applications and a corresponding maximum power limit for at least one proximity of the user to the mobile device; and
adjusting an active transmit power or active transmit power limit of the mobile device within the maximum power limit, the adjusting including disabling specific frequency bands.
2. The method of claim 1 , wherein the mobile device is a hand-held device, a HomeNodeB, or WiFi Access Point (AP).
3. The method of claim 1 , wherein the applications that are currently active on the mobile device provide one or more of speech, text, viewing, and hands free functionality.
4. The method of claim 1 , wherein the at least one proximity of the user to the mobile device stored in the table include proximity to a user's head, proximity to the user's torso, proximity to the user's fingers or hands, or operating in free space away from body proximity.
5. The method of claim 1 , wherein the maximum power limit is further set based upon a number and/or type of mobile device active radio(s).
6. The method of claim 1 , wherein the maximum power limit is further set based upon a frequency or wavelength of transmitted radio waves.
7. The method of claim 1 , wherein the active transmit power or active transmit power limit is adjusted within the maximum power limit according to an applicable remote power control process.
8. The method of claim 1 , wherein the mobile device may dynamically signal power headroom available for network power control processes.
9. The method of claim 1 , wherein the active transmit power or active transmit power limit is further adjusted based upon user dosage accumulated over time.
10. The method of claim 1 , wherein the active transmit power or active transmit power limit is further adjusted based upon medical devices implanted within an associated user.
11. The method of claim 1 , wherein the active transmit power or active transmit power limit is further adjusted based upon emergency conditions and/or mobile device operation with public safety networks.
12. The method of claim 1 , wherein the matching of a radio antenna is measured via a Voltage Standing Wave Ratio measurement that indicates a ratio of an amount of power being transmitted via the radio antenna to an amount of power being reflected back into the mobile device.
13. A method of dynamically controlling the total RF power emissions of a mobile device, the method comprising:
determining a local operating situation of the mobile device based upon a combination of: a measuring of a matching of one or more mobile device active radio antennas; and one or more active applications operating on the mobile device; and
increasing or decreasing an active transmit power or active power level of the mobile device according to the local operating situation, including disabling specific frequency bands, and using a table stored at a memory of the mobile device, the table comprising a plurality of local operating situations, such that performance of the mobile device is optimum while remaining SAR (Specific Absorption Rate) or field strength compliant.
14. The method of claim 13 , the method further comprising:
determining an available power headroom of the mobile device based upon the local RF operating situation of the mobile device;
transmitting the available power headroom of the mobile device to a network;
adjusting a maximum power limit of the mobile device according to a network power control process associated with the network; and
adjusting an active transmit power of the mobile device in accordance with the maximum power limit remotely determined by the network power control process.