Description:Technical Field
[0001] This disclosure may generally relate to the field of wireless communications.

Background
[0002] Wireless communication devices which include multiple antennae may need to coexist together in a small form factor. For example, a user equipment (UE) may include one or more antennae for wireless local area network (WLAN) communication and one or more antennae for wireless wide area network (WWAN) communication. The WLAN and WWAN antennae may interfere with one another when the multiple radios operate simultaneously. Radio performance may degrade due to the interference of WWAN and WLAN communication. For example, the LTE Band-7, Band-40 & Band-41 may interfere with Wi-Fi 2.4GHz bands or NR bands N77 & N79 may interfere with Wi-Fi 5GHz bands or higher. This disclosure proposes techniques to improve the in-device coexistence of different antennae by switching between one or more of a first type of antenna so that communication through the first type of antenna interferes the least with communication through a second type of antenna.

Brief Description of the Drawings
[0003] In the drawings, like reference characters generally refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the exemplary principles of the disclosure. In the following description, the disclosure may be described with reference to the following drawings, in which:
FIG. 1 illustrates an exemplary radio communication network.
FIG. 2 illustrates an exemplary internal configuration of a terminal device.
FIGS. 3A and 3B illustrate exemplary terminal devices.
FIG. 4 illustrates an exemplary radio frequency front end of a 5G modem.
FIG. 5 illustrates an exemplary real time (RT) coexistence technique.
FIG. 6 illustrates an exemplary LookUp Table (LUT).
FIGS. 7 – 10 illustrate exemplary switching TX between one of 4 antennae in a wireless communication device.
FIG. 11 illustrates an exemplary improvement in de-sense performance based on antenna switching.
FIG. 12 illustrates an exemplary packet error rate (PER) due to RF interference.
FIG. 13 illustrates an exemplary impact on performance due to switching.
FIG. 14 illustrates an exemplary flow chart of a method for switching antennae.
FIG. 15 illustrates an exemplary flow chart of a method for switching antennae.

Detailed Description
[0004] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of some examples. However, it will be understood by persons of ordinary skill in the art that some examples may be practiced without these specific details. In other instances, well-known methods, procedures, components, units and/or circuits have not been described in detail so as not to obscure the discussion.
[0005] Wireless communication devices may include multiple antennae communicating on different frequency bands. Techniques to avoid interference between multiple antennae may include Non-real time (NRT) and real time (RT) coexistence techniques between WWAN and WLAN communications. However, NRT coexistence techniques may require Bulk Acoustic Wave (BAW) filters to support simultaneous WWAN and WLAN communication. BAW filters are expensive and increase the cost of a wireless communication device without completely eliminating the interference. NRT coexistence techniques may include WLAN channel selection to avoid interference with WWAN communication. However, this limits WLAN communication to channels with lower interference of WWAN communication.
, Claims:1. A mobile communication device comprising:
a processor configured to:
determine a first operating band of a first wireless communication on a first antenna;
determine a second operating band of a second wireless communication on a second antenna;
determine a first isolation metric between the first antenna and the second antenna based on the first operating band and the second operating band;
determine a second isolation metric between the first antenna and a third antenna based on the first operating band and the second operating band;
compare the first isolation metric with the second isolation metric; and
switch the second wireless communication from the second antenna to the third antenna based on the comparison.