Mobile electronic communication device with millimeter wave antenna management and management method

Abstract

The present invention relates to millimeter wave antenna management. A mobile electronic communication device performs millimeter wave antenna management for multiple millimeter wave antennas based on whether there is a human presence within the sensing distance of at least one millimeter wave antenna and whether one or more other millimeter wave antennas are in use or enabled by the device. For a given antenna, the presence of a human body can be thermally detected, but different confidence levels are applied depending on the status of other millimeter wave antennas on the device.

Description

Technical Field

[0001] The present disclosure relates generally to mobile electronic communication devices and, more particularly, to systems and methods for activating and deactivating one or more millimeter wave antennas associated with a mobile electronic communication device. Background Art

[0002] As mobile communications technology has advanced, consumers have been able to take advantage of 1G, 2G, 3G, 4G LTE, and now 5G data rates. 1G established mobile connectivity and introduced mobile voice services, while 2G increased voice capacity. 3G added enhancements to mobile data (mobile broadband services), and 4G LTE enabled higher capacity for an improved mobile broadband experience.

[0003] Now, 5G (5th generation) integrates millimeter wave access into current cellular networks to take advantage of the ultra-wideband characteristics of the millimeter wave band. Since millimeter wave signals may interfere with or be interfered with by human tissue, the inventors hope to provide a mechanism for activating and deactivating one or more millimeter wave antennas on a mobile device.

[0004] Before continuing with the rest of the disclosure, it should be understood that the present disclosure can address some or all of the disadvantages listed or implied in this background section. However, except to the extent explicitly indicated in the claims, any such benefit is not a limitation on the disclosed principles or the scope of the appended claims.

[0005] In addition, the discussion of the technology in this background section reflects the inventor's own observations, considerations and ideas, and is by no means intended to accurately catalog, or comprehensively summarize any prior art references or practices. As such, the inventor expressly disclaims this section as an admission or assumption of prior art. Furthermore, the identification or suggestion of one or more desired courses of action herein reflects the inventor's own observations and ideas, and should not be assumed to indicate advisability generally recognized in the art. Summary of the invention

[0006] The present invention provides systems and methods for activating and deactivating one or more millimeter wave antennas associated with a mobile electronic communication device.

[0007] According to one embodiment, a mobile electronic communication device with millimeter wave antenna management includes: multiple millimeter wave antennas on the device, the multiple millimeter wave antennas including a first millimeter wave antenna and one or more other millimeter wave antennas; a sensor array associated with the first millimeter wave antenna, the sensor array including at least a thermal sensor; a millimeter wave transceiver, the millimeter wave transceiver configured to transmit via an enabled millimeter wave antenna among the multiple millimeter wave antennas; and a processor, the processor configured to determine via the sensor array whether there is a human body within a predetermined sensing distance of the first millimeter wave antenna and whether any of the one or more other millimeter wave antennas on the device is enabled, and selectively enable and disable the first millimeter wave antenna based on whether there is a human body within the predetermined sensing distance of the sensor array and whether any of the one or more other millimeter wave antennas on the device is enabled.

[0008] According to another embodiment, a method for managing the use of a first millimeter wave antenna on a mobile electronic communication device having multiple millimeter wave antennas, the method comprising: detecting changes in thermal radiation near the first millimeter wave antenna, the changes being consistent with human body movement; determining whether one or more other millimeter wave antennas on the device are in use, and thereafter determining whether the presence of a human body exists within the sensing distance of the sensor, wherein determining whether the presence of a human body exists comprises applying a first confidence level if one or more other millimeter wave antennas on the device are in use, otherwise using a second confidence level, the second confidence level being lower than the first confidence level. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] While the appended claims set forth the features of the present technology with particularity, these technologies and their objects and advantages will be best understood from the following detailed description taken in conjunction with the accompanying drawings:

[0010] Figure 1 is a general schematic representation of a mobile electronic device in which various embodiments of the disclosed principles may be implemented;

[0011] Figure 2 Yes Figure 1 A schematic diagram of a device in which a millimeter wave antenna and an associated sensor array are shown;

[0012] Figure 3 is a flow chart illustrating a process for millimeter wave antenna management according to an embodiment of the disclosed principles;

[0013] Figure 4 The present invention is a diagram showing an embodiment according to the disclosed principle. Figure 3A flowchart of a startup process within a millimeter wave antenna management process; and

[0014] Figure 5 is a flow chart illustrating an alternative process for millimeter wave antenna management according to an embodiment of the disclosed principles. DETAILED DESCRIPTION

[0015] Before presenting a detailed discussion of embodiments of the disclosed principles, an overview of certain embodiments is given to help the reader understand the following discussion. As mentioned above, 5G uses millimeter waves to achieve ultra-wideband characteristics. However, because millimeter wave signals may interfere with or be interfered with by human tissue, a reliable and effective mechanism for activating and deactivating one or more millimeter wave antennas on a mobile device is needed.

[0016] In an embodiment of the disclosed principles, a mobile communication device employs multiple millimeter wave antennas, wherein one or more of these antennas are associated with one or both of a thermal sensor and a capacitive sensor. In such a device, when initializing sensor states and baselines, it is not yet known which sensors may be occluded by a person, if any. For example, a temperature sensor initialized at 70 degrees Celsius may be reading a person's hand temperature or just the ambient temperature.

[0017] In an embodiment, the characteristics of human motion allow this dilemma to be resolved. Specifically, positive or negative temperature changes with a rate of change consistent with human motion are used to identify potential human contact or presence. If no such motion is detected, the device uses the data in its filtering algorithm to update the local baseline for that sensor.

[0018] However, if such motion is detected, the magnitude of the temperature change is analyzed to determine if the magnitude is large enough to be consistent with motion within the detection distance (e.g., 10 cm). When these criteria are met, indicating that a possible human body is present within the detection distance, the antenna associated with the thermal sensor is disabled and its baseline value is frozen to avoid having a baseline that tracks the presence of a human body. As an alternative to freezing the baseline, in an embodiment, the device can continue to adjust based on a global baseline, which is derived from averaging the values ​​of other sensors.

[0019] Regarding release, i.e., unfreezing the baseline of the thermal sensor and enabling the associated mmWave antenna, human motion is again used as a trigger. If a slope change consistent with human motion within the detection area is detected, further steps are taken in an embodiment to determine whether the sensor is to be released. In particular, human motion away from the sensor (temperature moving back toward the baseline) can be used as a prerequisite for release in this embodiment. For example, the system can analyze and take into account whether the user has completely moved out of the detection area and whether the temperature reduction matches the original change. The tracked changes can be recorded, or simply compared to the original or global baseline.

[0020] With this overview in mind, and now turning to a more detailed discussion in conjunction with the accompanying drawings, the technology of the present disclosure is illustrated as being implemented in or via a suitable device environment. The following device description is based on embodiments and examples in which or via which the disclosed principles can be implemented, and should not be construed as limiting claims regarding alternative embodiments not explicitly described herein.

[0021] So, for example, although Figure 1 An example mobile electronic communication device is described in which embodiments relating to the disclosed principles may be implemented, but it will be appreciated that other device types may be used including, but not limited to, laptop computers, tablet computers, etc. It will be appreciated that additional or alternative components may be used in a given implementation depending on user preference, component availability, price point, and other considerations.

[0022] In the illustrated embodiment, components of the user device 110 include a display screen 120, applications (e.g., programs) 130, a processor 140, a memory 150, one or more input components 160 such as RF input facilities or wired input facilities including, for example, one or more antennas and associated circuits and logic. The antennas and associated circuits can support any number of protocols, such as WiFi, Bluetooth, different generations of cellular services including 5G, etc.

[0023] The device 110 as illustrated also includes one or more output components 170 such as RF (radio frequency) or wired output facilities. The RF output facilities can similarly support any number of protocols, such as WiF, Bluetooth, cellular including 5G, etc., and can be the same as or overlap with the associated input facilities. It should be understood that a single physical input can be used for both sending and receiving.

[0024] Processor 140 can be a microprocessor, a microcomputer, an application specific integrated circuit, or other suitable integrated circuit. For example, processor 140 can be implemented via one or more microprocessors or controllers from any desired series or manufacturer. Similarly, memory 150 is a non-temporary medium that can (but does not have to) reside on the same integrated circuit as processor 140. Additionally or alternatively, memory 150 can be accessed via a network, such as via cloud-based storage. Memory 150 may include random access memory (e.g., synchronous dynamic random access memory (SDRAM), dynamic random access memory (DRAM), RAMBUS dynamic random access memory (RDRM), or any other type of random access memory device or system). Additionally or alternatively, memory 150 may include read-only memory (i.e., a hard drive, flash memory, or any other desired type of memory device).

[0025] The information stored by the memory 150 can include program code associated with one or more operating systems or applications (e.g., applications 130) and information data, such as program parameters, process data, etc. The operating system and applications are typically implemented via executable instructions stored in a non-transitory computer-readable medium (e.g., memory 150) to control the basic functions of the electronic device 110. These functions may include, for example, interaction between various internal components and storage and retrieval of applications and data to and from the memory 150.

[0026] Furthermore, with respect to applications and modules, these typically utilize the operating system to provide more specific functionality such as file system services and handling of protected and unprotected data stored in memory 150. In an embodiment, a module is a software agent that includes or interacts with a hardware component, such as one or more sensors, and manages the operation and interaction of device 110 with respect to the described embodiments.

[0027] With respect to information data, such as program parameters and process data, this non-executable information can be referenced, manipulated, or written by an operating system or application program. Such information data can include, for example, data pre-programmed into the device during manufacture, data created by the device or added by a user, or any of various types of information uploaded to, downloaded from, or otherwise accessed at a server or other device with which the device communicates during its ongoing operation.

[0028] In an embodiment, mmWave management module 180 performs antenna management processes as described below.MmWave management module 180 may be represented in device 110 as code executed by processor 140 of device 110, where the code comprises computer executable instructions read from a non-transitory computer readable medium.

[0029] In an embodiment, a power source 190, such as a battery or fuel cell, is included to provide power to the device 110 and its components. Additionally or alternatively, the device 110 may be powered externally, such as by a vehicle battery, a wall socket, or other power source. In the illustrated example, all or some of the internal components communicate with each other via one or more shared or dedicated internal communication links 195, such as an internal bus.

[0030] In an embodiment, the device 110 is programmed so that the processor 140 and the memory 150 interact with other components of the device 110 to perform various functions. The processor 140 may include or implement various modules and execute programs for initiating different activities such as initializing applications, transferring data, and switching through various graphical user interface objects (e.g., switching through various display icons linked to executable applications). As described above, the device 110 may include one or more display screens 120. These display screens may include one or both of an integrated display and an external display.

[0031] In an embodiment, the input 160 and output 170 components include multiple millimeter wave antennas and at least one sensor array juxtaposed with the multiple millimeter wave antennas. The sensor array includes capacitive sensors and thermal sensors. The device may also include one or more accelerometers or other inertial sensors as one of the input components 160, and may also include other position or motion sensors.

[0032] Figure 2 yes Figure 1 1 is a schematic diagram of a device 110 showing the millimeter wave antenna and associated sensor array in more detail. In the illustrated embodiment, the device 210 (110) includes a millimeter wave transceiver 201. The transceiver 201 is selectively linked to each of four millimeter wave antennas 203, 205, 207, 209.

[0033] The device 210 (110) similarly includes a respective sensor array 211, 213, 215, 217 juxtaposed with each of the four millimeter wave antennas 203, 205, 207, 209, such that each sensor array 211, 213, 215, 217 is capable of sensing temperature and capacitance at or within a detection distance of the associated antenna 203, 205, 207, 209. The device processor 240 ( Figure 1 140) monitors the sensor arrays 211, 213, 215, 217 in order to perform the techniques and processes described herein.

[0034] Go to Figure 3 , which shows a flow chart of a process 300 by which a device 110 (210) operates according to an embodiment of the disclosed principles. Although it should be understood that other types of mobile communication devices are also suitable when appropriately configured, it is assumed that the execution or host device is connected to Figure 1 and Figure 2 Additionally, process 300 is described as it relates to a single sensor array and associated antenna, but it should be understood that process 300 is performed for each array and antenna, whether in series or in parallel.

[0035] In stage 301 of process 300, the device performs a Figure 4 The startup algorithm discussed in more detail below. After startup, process 300 flows to stage 303, where the device determines whether the thermal signature detected has a slope (temporal thermal gradient) consistent with human motion. For example, very gradual changes may simply correspond to changes in the ambient air rather than representing human movement.

[0036] If no such movement is detected at stage 303, process 300 flows to stage 305, where the device updates the local (sensor) baseline and returns to stage 303. Otherwise, if a qualified movement is detected at stage 303, process 300 flows to stage 307, where the device determines whether the change in the amplitude of the detected thermal signal (thermal change amplitude) is large enough to be consistent with motion within the detection distance. If not, process 300 flows to stage 305. Otherwise, process 300 flows to stage 309, where the device disables the relevant millimeter wave antenna and freezes the sensor baseline. This indicates that human tissue is determined to be likely present within the detection distance of the antenna in question.

[0037] Then at stage 311, the device determines whether there is another slope change in the thermal signal consistent with human movement. If not, process 300 returns to stage 309. Otherwise, the process flows to stage 313, where the device determines whether the detected signal slope matches the initially detected slope (from stage 303) within a predetermined tolerance.

[0038] If the slopes match within a predetermined tolerance, the process returns to stage 309. Otherwise, process 300 moves to stage 315, where the device determines whether the detected amplitude change of the thermal signal is similar (e.g., within a predetermined tolerance) to the amplitude change initially detected. If not, the process returns to stage 309. Otherwise, process 300 moves to stage 317, where the associated antenna is re-enabled and the process returns to stage 305.

[0039] As described above, the mobile communication device 110 (210) executes a startup algorithm at the beginning of the process 300. Figure 4 , which shows the startup algorithm in more detail. At stage 401 of process 400, the device disables multiple millimeter wave antennas on the device and then moves to stage 403, which provides, for example, a 2-second delay to allow time for the user to remove his or her hand from the device.

[0040] Subsequent stages are performed for each antenna and associated sensor array, either serially or in parallel. At stage 405, the device determines, for example, via its accelerometer, whether the device is placed on a table or other fixed surface. If so, process 400 jumps to stage 417, where it updates the sensor baseline and enables the associated antenna. Otherwise, process 400 flows to stage 407, where, if the device has a capacitive sensor collocated with the antenna of interest, the process flows to stage 409. Otherwise, the process continues to stage 410.

[0041] At stage 409, it is determined whether the capacitive sensor has been triggered. If not, the process 400 flows to stage 417, but otherwise flows to stage 411, where the device tracks the temperature sensor reading but does not update the sensor baseline. Then at stage 413, whether the device is still placed on a desktop or other fixed surface. If so, the process 400 flows to stage 417. Otherwise, the process flows to stage 415, where the device determines whether the capacitive sensor has been released (i.e., no longer triggered) and there has been a thermal slope event, as described above, indicating human movement. If both criteria are met, the process 400 flows to stage 417. Otherwise, the process 400 returns to stage 411.

[0042] Return to stage 407 and continue at stage 410, that is, if the thermal sensor does not have a capacitive sensor associated with it, the device updates the local (sensor) baseline. Then at stage 412, the device determines whether other local (sensor) baselines relative to other thermal sensors associated with other antennas have stabilized. If not, the process returns to stage 410, otherwise the process 400 flows to stage 414, where the device determines whether the current thermal sensor reading matches the global (device-wide) average of other thermal sensors within a predetermined tolerance. If not, the process 400 returns to stage 410, otherwise the process 400 flows to stage 417 to update the local (sensor) baseline and enable the associated antenna.

[0043] As a result of this process, 400, in conjunction with process 300, one or more mmWave antennas may be disabled at any given moment (the device may operate using LTE until mmWave is available again), while the other antennas remain activated. Additionally, one of the activated antennas may then be selected for use, or in an embodiment, the activated antennas may be multiplexed if desired. Regardless, exposure to mmWave radiation is managed to remain within acceptable limits while allowing as much use of the mmWave antenna system as possible.

[0044] In another embodiment, one or more antennas may be throttled, or used at a reduced power setting, rather than disabled, if doing so allows the radiated power density limits to be observed. Similarly, beam steering may be used rather than disabled to avoid detected human tissue, if doing so still allows the radiated power density limits to be observed.

[0045] exist Figure 3 In an alternative embodiment of process 300, the device may instead consider the states of other device antennas to make enable or disable decisions regarding a particular antenna of interest. Figure 5 is a flow chart illustrating an example of this alternative process 500 for millimeter wave antenna management.

[0046] Process 500 includes the first portion of process 300, but is disengaged after stage 311 of process 300. In particular, if it is determined at stage 311 of process 300 that there is another slope change in the thermal signal consistent with human movement, route A is taken, which provides Figure 5 The entrance of process 500.

[0047] At stage 501 of process 500, the device determines whether one or more other millimeter wave antennas on the device are enabled. If it is determined at stage 501 that one or more other millimeter wave antennas on the device are enabled, process 500 flows to stage 509, which will be discussed below. Conversely, if it is determined at stage 501 that no other millimeter wave antennas on the device are enabled, process 500 flows to stage 503, where the device determines whether one or more other millimeter wave antennas on the device are enabled. Figure 3 The detected slope of stage 311 is within the wide window. With respect to direction, a slope indicating that the sensor temperature is moving back toward the baseline is consistent with user movement away from the sensor.

[0048] Here, the term "wide" refers to a less restrictive match of slope and amplitude changes to indicate that a person is not touching the device, for example, opposite to the direction of the values ​​detected when the device is touched, but not necessarily matching the absolute levels of slope and amplitude. In other words, when other mmWave antennas are not available, there is a greater need to re-enable the current antenna, and therefore a lower threshold or looser tolerance is used. This provides a more forgiving decision window for antenna release. In other words, the decision to re-enable an antenna when the associated sensor is released is made with a lower required confidence that the sensor is actually not touched. One reason for the wider window is that in this case, there are no other antennas available.

[0049] If it is determined at stage 503 that Figure 3If the detected slope of stage 311 of process 300 is not within the wide window, process 500 flows to stage 309 of process 300 via link C. Otherwise, process 500 flows to stage 505, where the device determines whether the detected thermal signal amplitude (e.g., from stage 315 of process 300) also fits within the wide window. If not, process 500 flows to link C. Otherwise, process 500 flows to stage 309 of process 300 via link B.

[0050] Returning to stage 501, if it is determined at this stage that one or more other millimeter wave antennas on the device are enabled, process 500 flows to stage 509, as described above. At stage 509, process 500 determines whether the detected slope is within a narrow window (strict window, higher threshold, high confidence level that the antenna has indeed been released). As used herein, a narrow window means a stricter amplitude and slope profile matching threshold than a wide window, thereby enhancing a higher confidence that the user's finger has indeed been removed from the sensor and associated antenna.

[0051] The following paragraph should be placed Figure 5 The delay feature can be enabled alone or in addition to the "Slope in narrow window" block in the figure below. This delay feature can be enabled alone or in addition to the "Slope in narrow window" when the other antenna / antennas are available and the device has been held for a long time. The wait feature is to collect more valid data while allowing the device to reach thermal equilibrium / cool down after being held. If the other antenna is operational and driven primarily by extended touches on the sensor, this delay is an important feature (can afford to wait because the other antenna is operational).

[0052] A delay may also be implemented to accumulate a greater number of thermal samples. This will generally enable a higher confidence decision based on the affected area of ​​the device reaching a steady-state temperature. The tighter limit and delay before re-enabling the antenna is justified because, as determined at stage 501, there are other antennas that are enabled.

[0053] If it is determined at stage 509 that the detected slope is within the narrow window, the process moves to stage 511, where it is determined whether the thermal signal amplitude is within the narrow window, e.g., closely matches the original amplitude of the change. This would be the case, for example, when the user moves completely out of the detection area. The device may keep a record of the thermal changes, or the changes may be compared to the original temperature or a global baseline across all sensors.

[0054] If the thermal signal amplitude is within the narrow window, then process 500 flows via link B to stage 317 of process 300. Otherwise, process 500 flows via link C to stage 309 of process 300. Similarly, if, in contrast, it is determined at stage 509 that the detected slope is not within the narrow window, then the process flows via link C to stage 309 of process 300, where the device disables the associated mmWave antenna and freezes the sensor baseline before continuing.

[0055] In this way, the presence and state of other millimeter wave antennas on the device can be taken into account when enabling or disabling another millimeter wave antenna on the device. This enables the device to provide a more robust user experience in terms of millimeter wave communications while still minimizing the user's millimeter wave exposure.

[0056] It should be understood that various systems and processes have been disclosed herein. However, in view of the many possible embodiments that can be applied to the principles of the present disclosure, it should be recognized that the embodiments described herein with respect to the accompanying drawings are merely illustrative and should not be considered to limit the scope of the claims. Therefore, the technology described herein contemplates all such embodiments, as they may fall within the scope of the appended claims and their equivalents.

Claims

1. A mobile electronic communication device with millimeter wave antenna management, the mobile electronic communication device comprising: a plurality of millimeter wave antennas on the device, the plurality of millimeter wave antennas comprising a first millimeter wave antenna and one or more other millimeter wave antennas; a sensor array associated with the first millimeter wave antenna, the sensor array comprising at least a thermal sensor; a millimeter wave transceiver configured to transmit via an enabled millimeter wave antenna of a plurality of millimeter wave antennas; as well as a processor configured to determine, via the sensor array, whether there is a human body within a predetermined sensing distance of the first millimeter wave antenna and whether any of the one or more other millimeter wave antennas on the device is enabled, and selectively enable and disable the first millimeter wave antenna based on whether there is a human body within the predetermined sensing distance of the sensor array and whether any of the one or more other millimeter wave antennas on the device is enabled, The processor is further configured to selectively enable and disable the first millimeter wave antenna through the following steps: first disabling the first millimeter wave antenna, then determining whether there is a human body within the sensing distance of the sensor array, and using a first confidence level if any of the one or more other millimeter wave antennas is in use, otherwise using a second confidence level, and the second confidence level is lower than the first confidence level.

2. The mobile electronic communication device according to claim 1, wherein: Managing usage of the first millimeter wave antenna includes reducing transmission power of the first millimeter wave antenna.

3. The mobile electronic communication device according to claim 1, wherein: Managing usage of the first millimeter wave antenna includes steering a transmission mode associated with the first millimeter wave antenna.

4. The mobile electronic communication device according to claim 1, wherein: Managing use of the first millimeter wave antenna includes: detecting, via the thermal sensor, the presence of a human body within the sensing distance of the first millimeter wave antenna; disabling the first millimeter wave antenna and freezing a baseline of the thermal sensor associated with the first millimeter wave antenna; detecting, via the thermal sensor, that the detected presence of a human body is no longer within the sensing distance; and The first millimeter wave antenna is enabled.

5. The mobile electronic communication device according to claim 4, wherein: Detecting the presence of a human body within the sensing distance of the first millimeter wave antenna includes: detecting temporal thermal gradients and thermal variation amplitudes via the thermal sensor; and The detected temporal thermal gradients and magnitude of thermal changes were determined to be consistent with the presence and movement of a human body.

6. A method for managing usage of a first millimeter wave antenna on a mobile electronic communication device having multiple millimeter wave antennas, the mobile electronic communication device also including a sensor array associated with the first millimeter wave antenna, the sensor array including at least a thermal sensor, the method comprising: detecting changes in thermal radiation near the first millimeter wave antenna consistent with human body movement; Determine whether one or more other millimeter wave antennas on the device are in use, and thereafter determine whether the presence of a human body exists within the sensing distance of the sensor array, wherein determining whether the presence of a human body exists includes applying a first confidence level if one or more other millimeter wave antennas on the device are in use, otherwise applying a second confidence level, and the second confidence level is lower than the first confidence level.

7. The method according to claim 6, wherein: Applying a first confidence level includes implementing a first thermal signal time slope window and a first thermal signal variation amplitude window, and wherein applying a second confidence level includes implementing a second thermal signal time slope window and a second thermal signal variation amplitude window, wherein the first thermal signal time slope window and the first thermal signal variation amplitude window are narrower than the second thermal signal time slope window and the second thermal signal variation amplitude window, respectively.

8. The method of claim 6, further comprising implementing a measurement period delay during which thermal samples are accumulated prior to the detecting step.

9. The method according to claim 8, wherein: Implementing the measurement period delay includes first determining that the first millimeter wave antenna has been obscured by the presence of a human body for more than a predetermined period of time.

10. The method according to claim 6, wherein: Each window is positioned by reference to a record of past thermal changes.

11. The method according to claim 6, wherein: Each window is positioned by reference to an average of thermal data recorded with respect to the one or more other millimeter wave antennas on the device.

12. The method according to claim 6, wherein: Each window is positioned by reference to an average of thermal data recorded for all mmWave antennas on the device.

13. The method according to claim 6, wherein: Each window is positioned by reference to a baseline temperature of a thermal sensor associated with the first millimeter wave antenna.

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