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CN119232219A - Antenna adaptive switching method for UWB terminal equipment and computer readable storage medium - Google Patents

Antenna adaptive switching method for UWB terminal equipment and computer readable storage medium Download PDF

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Publication number
CN119232219A
CN119232219A CN202411735498.6A CN202411735498A CN119232219A CN 119232219 A CN119232219 A CN 119232219A CN 202411735498 A CN202411735498 A CN 202411735498A CN 119232219 A CN119232219 A CN 119232219A
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China
Prior art keywords
antenna
switching
time period
preset time
current working
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CN202411735498.6A
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Chinese (zh)
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CN119232219B (en
Inventor
黄源良
丁杰伟
姜晓伟
赵少华
张为民
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Shenzhen Jieyang Microelectronics Co ltd
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Shenzhen Jieyang Microelectronics Co ltd
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Priority to CN202411735498.6A priority Critical patent/CN119232219B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Quality & Reliability (AREA)
  • Electromagnetism (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention discloses an antenna self-adaptive switching method of UWB terminal equipment and a computer readable storage medium, wherein the antenna self-adaptive switching method of the UWB terminal equipment comprises the steps of responding to the beginning of first ranging, entering a first switching antenna state, acquiring the received signal quality of a current working antenna in a first preset time period from the beginning of the first ranging in the first switching antenna state, confirming whether the working antenna needs to be switched and whether the working antenna jumps to a second switching antenna state, acquiring the received signal quality of the current working antenna in the second preset time period from the beginning of the first ranging in the second switching antenna state, confirming whether the working antenna needs to be switched and the working antenna jumps to the first switching antenna state, and the length of the first preset time period is smaller than that of the second preset time period. The invention ensures stable and reliable user experience all the time.

Description

Antenna self-adaptive switching method of UWB terminal equipment and computer readable storage medium
Technical Field
The invention relates to the technical field of Ultra-Wideband (UWB) wireless systems, in particular to an antenna self-adaptive switching method of UWB terminal equipment and a computer readable storage medium.
Background
In the application scenario of the UWB terminal device, the communication between the UWB terminal device and the opposite single UWB device may be used for ranging/angle measurement, such as a mobile phone-Tag (Tag) search application, etc., or the communication between the UWB terminal device and the opposite multiple UWB anchor points may be used for ranging/angle measurement, such as a digital car key application, etc.
In the use scenario of UWB terminal devices, the antenna may be severely blocked due to various reasons such as the user holding the device or putting the terminal product in a pocket, thereby affecting signal transmission and ranging between two UWB devices. To solve this problem, a current common solution is to use multiple UWB antennas in the terminal device (2 antennas in many cases, considering the limited size and cost of the terminal device) to be placed in different positions or orientations of the terminal product. In UWB ranging, the different positions or directions of the 2 UWB antennas may result in different shielding degrees. Therefore, a method of adaptively switching UWB antennas is needed to be adopted in UWB chip firmware, and a switch on a real-time control board is switched through interface pins such as GPIO (General Purpose Input/Output), so that the antenna with better current signal quality is always selected, and better user experience is obtained.
Due to limiting factors such as the volume and structure of the terminal product, different board-level wiring from different UWB antennas to the transmitting port/receiving port pins of the UWB chip can also cause signal loss of different degrees. These different board level cabling signal losses, overlapping the different wireless air interface signal losses experienced from the respective antennas to the wireless peer devices, ultimately result in a very large variance in the received/transmitted signal quality for the respective antennas, and this variance may vary with different times, environments.
In addition, in ultra wideband UWB protocols such as 802.15.4 and 802.15.4z/4ab defined by the Institute of Electrical and Electronics Engineers (IEEE), additional detection signal fields required for detecting antenna signal quality are not defined. Under the condition of lacking additional detection signal field support, the method for adaptively switching the UWB antenna needs to be realized, so that the signal quality change of different antennas can be accurately tracked in real time and the antenna with good signal quality can be switched to the antenna with poor signal quality, and the blind switching to the antenna with poor signal quality can be avoided, thereby ensuring stable and reliable user experience all the time, and having great challenges.
The foregoing background is only for the purpose of facilitating an understanding of the principles and concepts of the application and is not necessarily in the prior art to the present application and is not intended to be used as an admission that such background is not entitled to antedate such novelty and creativity by virtue of prior application or that it is already disclosed at the date of filing of this application.
Disclosure of Invention
In order to solve the technical problems, the invention provides an antenna self-adaptive switching method and a computer readable storage medium of UWB terminal equipment, which can accurately track the signal quality change of different antennas in real time and switch to an antenna with good signal quality under the condition of not interrupting normal signal transmission, and avoid switching the antenna operation too frequently and aggressively, thereby ensuring stable and reliable user experience all the time.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention discloses an antenna adaptive switching method of UWB terminal equipment, comprising the steps of:
Entering a first switched antenna state in response to the start of the first ranging;
In the first switching antenna state, starting from the starting moment of the first ranging in the state, acquiring the received signal quality of the current working antenna in a first preset time period, and determining whether to switch the working antenna and jump to a second switching antenna state according to the received signal quality of the current working antenna in the first preset time period;
In the second switching antenna state, starting from the starting time of the first ranging in the state, acquiring the received signal quality of the current working antenna in a second preset time period, and determining whether to switch the working antenna and jump to the first switching antenna state according to the received signal quality of the current working antenna in the second preset time period;
the length of the first preset time period is smaller than that of the second preset time period.
Preferably, the determining whether to switch the working antenna and jump to the second switching antenna state according to the received signal quality of the current working antenna in the first preset time period includes:
And if not, acquiring signal strength indication values of all data packets received by the current working antenna in the first preset time period, confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the first preset time period, and jumping to the second switching antenna state.
Preferably, when the current working antenna does not successfully receive any data packet or all received data packets are CRC errors in the first preset time period, the signal quality difference flag bit of the current working antenna is set to be non-zero, the working antenna is switched and stays in the first switching antenna state, otherwise, the signal strength indication value of all the data packets received by the current working antenna in the first preset time period is obtained, whether the working antenna is switched is confirmed according to the signal strength indication value of all the data packets received by the current working antenna in the first preset time period, the signal quality difference flag bit of all the antennas is set to be zero, and the second switching antenna state is skipped.
Preferably, the determining whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the first preset time period includes:
and calculating the signal intensity indication average value of the current working antenna in the first preset time period according to the signal intensity indication values of all data packets received by the current working antenna in the first preset time period, judging whether the signal intensity indication average value of the current working antenna in the first preset time period is larger than or equal to a preset threshold value, if so, not switching the working antenna, if not, continuously judging whether the antennas with signal quality difference zone bit of zero exist in other antennas, if so, switching the working antenna, and if not, not switching the antennas.
Preferably, the determining whether to switch the working antenna and jump to the first switching antenna state according to the received signal quality of the current working antenna in the second preset time period includes:
and if not, acquiring signal strength indication values of all data packets received by the current working antenna in the second preset time period, confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the second preset time period, and continuing to stay in the second switching antenna state.
Preferably, when the current working antenna does not successfully receive any data packet or all received data packets are CRC errors in the second preset time period, setting a signal quality difference flag bit of the current working antenna to be non-zero, switching the working antenna and jumping to the first switching antenna state, otherwise, acquiring signal strength indication values of all data packets received by the current working antenna in the second preset time period, calculating a signal strength indication average value of the current working antenna in the second preset time period according to the signal strength indication values of all data packets received by the current working antenna in the second preset time period, judging whether the signal strength indication average value of the current working antenna in the second preset time period is larger than or equal to a preset threshold value, if so, not switching the working antenna, and if not, switching the working antenna.
Preferably, the value range of the preset threshold value is [ -100dbm, -30dbm ].
Preferably, the first preset time period is 50ms-500ms, and the second preset time period is 100ms-1s.
Preferably, before the entering the first switched antenna state in response to the start of the first ranging, the method further comprises:
responding to the chip power-on of UWB terminal equipment, setting the signal quality difference zone bit of all antennas to zero, and selecting the current working antenna according to the configuration of the upper computer;
And responding to the wake-up of the chips of the UWB terminal equipment from the sleep state, setting the signal quality difference zone bit of all the antennas to be zero, and selecting the current working antenna according to the configuration of the upper computer or taking the last selected working antenna before the sleep state as the current working antenna.
In a second aspect, the present invention discloses a computer readable storage medium having a computer program stored therein, wherein the computer program is configured to be executed by a processor to perform the antenna adaptive switching method of the UWB terminal device according to the first aspect.
Compared with the prior art, the antenna self-adaptive switching method and the computer-readable storage medium for the UWB terminal equipment have the advantages that whether the antenna needs to be switched and the frequency of the action of the antenna is adaptively adjusted or not is confirmed only based on the acquisition of the receiving signals of the current working antenna, on one hand, the purpose that the signal quality change of different antennas can be accurately tracked and switched to the antenna with good signal quality in real time under the condition that normal signal transmission is not interrupted is achieved, and on the other hand, the phenomenon that the user experience is influenced due to the fact that the antenna operation is switched too frequently and aggressively is avoided, and therefore stable and reliable user experience is guaranteed all the time is achieved.
In a further scheme, the invention has the following beneficial effects:
(1) And confirming whether to switch the working antenna according to the comparison between the signal strength indication values of all data packets received by the current working antenna in a preset time period and a preset threshold value, and confirming that the signal quality difference flag bit of the switched antenna is nonzero when the antenna is switched, so that blind switching to the antenna with poor signal quality of the antenna can be avoided, and stable and reliable user experience is further ensured all the time.
(2) The signal quality difference flag bit of each antenna is set to zero before the first switching antenna state is switched to the second switching antenna state, so that the signal quality difference flag bit data of each antenna in the first switching antenna state is not used any more when the second switching antenna state is adopted, and the calculation accuracy is improved.
Drawings
Fig. 1 is a flowchart of an antenna adaptive switching method of a UWB terminal device according to an embodiment of the present invention;
FIGS. 2a and 2b are block diagrams of exemplary configurations of UWB terminal devices with two antennas according to embodiments of the present invention;
fig. 3 is a schematic diagram of an antenna switching state machine according to an embodiment of the present invention;
fig. 4 is an example of antenna switching and state hopping timing in an embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for both the fixing action and the circuit/signal communication action.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing embodiments of the invention and to simplify the description by referring to the figures, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
As shown in fig. 1, a first embodiment of the present invention discloses an antenna adaptive switching method of UWB terminal equipment, including the following steps:
S1, responding to the beginning of the first ranging, and entering a first switching antenna state;
S2, in the state of the first switching antenna, starting from the starting moment of the first ranging in the state, acquiring the received signal quality of the current working antenna in a first preset time period, and determining whether to switch the working antenna and jump to the state of the second switching antenna according to the received signal quality of the current working antenna in the first preset time period;
Wherein, according to the received signal quality of the current working antenna in the first preset time period, determining whether to switch the working antenna and jump to the second switching antenna state includes:
And if not, acquiring signal strength indication values of all the data packets received by the current working antenna in the first preset time period, confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the first preset time period, setting the signal quality difference flag bit of all the antennas to be zero, and jumping to a second switching antenna state.
The step of confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the first preset time period includes:
And calculating the signal intensity indication average value of the current working antenna in the first preset time period according to the signal intensity indication values of all data packets received by the current working antenna in the first preset time period, judging whether the signal intensity indication average value of the current working antenna in the first preset time period is larger than or equal to a first preset threshold value, if so, not switching the working antenna, if not, continuously judging whether antennas with signal quality difference zone bit of zero exist in other antennas, if so, switching the working antenna, and if not, not switching the antennas. Wherein the range of the first preset threshold value is [ -100dbm, -30dbm ].
S3, under the second antenna switching state, starting from the starting moment of the first ranging in the state, acquiring the received signal quality of the current working antenna in a second preset time period, and determining whether to switch the working antenna and jump to the first antenna switching state according to the received signal quality of the current working antenna in the second preset time period;
Wherein determining whether to switch the working antenna and jump to the first switching antenna state according to the received signal quality of the current working antenna in the second preset time period includes:
And if not, acquiring signal strength indication values of all data packets received by the current working antenna in the second preset time period, confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the second preset time period, and continuing to stay in the second switching antenna state.
The step of confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the second preset time period includes:
Calculating the signal intensity indication average value of the current working antenna in the second preset time period according to the signal intensity indication values of all data packets received by the current working antenna in the second preset time period, judging whether the signal intensity indication average value of the current working antenna in the second preset time period is larger than or equal to a second preset threshold value, if so, not switching the working antenna, and if not, switching the working antenna. Wherein the second preset threshold value is within the range of [ -100dbm, -30dbm ].
Wherein the length of the first preset time period is smaller than the length of the second preset time period, i.e. the frequency of the first switched antenna state is higher than the frequency of the second switched antenna state. In some embodiments, the first predetermined period of time is 50ms-500ms, more preferably 100ms-200ms, and the second predetermined period of time is 100ms-1s, more preferably 500ms-600ms.
The method further comprises the following steps before the step S1:
responding to the chip power-on of UWB terminal equipment, setting the signal quality difference zone bit of all antennas to zero, and selecting the current working antenna according to the configuration of the upper computer;
And responding to the wake-up of the chips of the UWB terminal equipment from the sleep state, setting the signal quality difference zone bit of all the antennas to be zero, and selecting the current working antenna according to the configuration of the upper computer or taking the last selected working antenna before the sleep state as the current working antenna.
The antenna self-adaptive switching method of the UWB terminal equipment provided by the preferred embodiment of the invention is not only suitable for application scenes of two antennas, but also suitable for application scenes of more than two antennas, when the method is applied to the application scenes of more than two antennas, the multiple antennas can have serial numbers, when the antennas are switched, whether the corresponding antenna quality difference zone bit is zero or not is judged according to a fixed sequence, and the antenna with the first judged antenna quality difference zone bit is zero is switched, so that the multiple antennas can be ensured to be used, and the situations that the use frequency of some antennas is too high or the use frequency of some antennas is too low are avoided.
The antenna adaptive switching method of the UWB terminal equipment provided by the invention is further described in detail below with reference to specific embodiments.
Fig. 2a and 2b are block diagrams of configuration of an example of a UWB terminal device in which two antennas are arranged, wherein a Tx (transmit) pin 11 of a UWB chip 10 is connected to an external DPDT (double pole double throw) switch 30 through a Tx matching network 21, an Rx (receive) pin 12 is connected to an external DPDT (double pole double throw) switch 30 through an Rx matching network 22, and then the DPDT switch 30 is connected to two UWB antennas (including an antenna 0 and an antenna 1) through a BPF (band pass filter) 40. The DPDT switch 30 is controlled by the GPIO pin 13 of the UWB chip 10.
When the UWB chip 10 is operating normally, the Tx pin 11 and the Rx pin 12 are time division controlled, and the firmware of the UWB chip 10 may switch antennas in such a manner that (a) as shown in fig. 2a, the UWB terminal device transmits through the antenna 0 when the Tx path in the UWB chip 10 is operating and the Rx path is not operating, and as shown in fig. 2b, the UWB terminal device receives through the antenna 0 when the Rx path in the UWB chip 10 is operating and the Tx path is not operating. (b) As shown in fig. 2b, the UWB terminal device transmits through the antenna 1 when the Tx path is in operation and the Rx path is not in operation in the UWB chip 10, and as shown in fig. 2a, the UWB terminal device receives through the antenna 1 when the Tx path is in operation and the Tx path is not in operation in the UWB chip 10.
The firmware may dynamically adjust the antenna selection parameter ant_ Sel (antenna selection) based on the particular antenna selection strategy:
Ant_sel=0 the firmware operates in the manner of operation (a) above, i.e. with antenna 0 for transmission/reception.
Ant_sel=1 the firmware operates in the manner of operation (b) above, i.e. transmission/reception with antenna 1.
Wherein, when N antennas are provided within the UWB terminal device, the value of ant_sel may be 0, 1,..once., (N-1).
In the use scene of the UWB terminal equipment, the signal intensity of two antennas of the terminal equipment is greatly changed due to the action change (such as holding and putting trousers pocket) of the human body of the user, and the change is generally considered to be relatively slow and occurs in a sub-second time range (such as 500 ms). Therefore, the frequency at which the antenna switching operation occurs, which is monitored for the antenna signal strength in the UWB antenna switching strategy in the preferred embodiment of the present invention, is considered to occur once every several hundred ms (< 500 ms). The time parameter can be specifically configured by an upper computer of the UWB terminal equipment.
In general, if the antenna position and polarization direction of the terminal device are well designed, the situation that both antennas are severely blocked at the same time is a low probability event. In most cases, one antenna is severely blocked, and the signal of the other antenna is sufficient to support the ranging service to work properly.
Taking the UWB terminal device comprising 2 antennas as shown in fig. 2a and 2b as an example, the present invention provides an antenna adaptive switching method (based on the above description, that is, correspondingly switching the values of ant_sel) of a UWB terminal device, wherein a state machine diagram is shown in fig. 3, and the state machine diagram includes the following state hops:
After the UWB chip is electrified each time, the state machine enters an initialization state, flag bit parameters indicating that the signal quality of two antennas is poor are cleared, and the ANT_Sel selects a value configured by an upper computer.
After the UWB chip is powered up each time, the state machine enters an initialization state. Initializing a flag bit parameter bad_cqi (0:1) =0 indicating whether the signal quality of two antennas is poor, bad_cqi (0:1) =0 indicating that the signal quality of both antenna 0 and antenna 1 is not poor, bad_cqi corresponding to Bad Channel Quality Indication (indication of poor channel quality), and if a certain bit is 1, indicating that the signal quality of the corresponding antenna is poor, for example bad_cqi (0) =1, indicating that the signal quality of antenna 0 is poor. The ant_sel selects the value configured by the upper computer, so that a higher-level policy from the upper computer can be accepted, for example, after each power-on, the main antenna on the terminal product is first used for working, for example, based on the habit of holding by a person, a certain antenna which is more likely to be not blocked can be determined as the main antenna, and the other antenna is the auxiliary antenna.
A2, after the UWB chip wakes up from the sleep state each time, the state machine enters an initialization state, clears the flag bit parameter indicating that the signal quality of the two antennas is poor, and ANT_Sel can be selected as a value configured by an upper computer or a value which is selected last time before sleep and stored in a power-off-area (Always-On, AON) of the chip.
After each wakeup from sleep state, the UWB chip enters an initialization state. A flag bit parameter bad_cqi (0:1) =0 indicating whether or not signal quality of two antennas is poor is initialized. Ant_sel may be selected from the values configured by the host, or the values selected last time before sleep and saved to the AON, and which selection mode is specifically adopted may be determined by the configuration of the host. The main consideration is (1) if the upper computer configuration value is selected, a higher-level strategy from the upper computer can be accepted, such as the main antenna on the terminal equipment is preferred, the main antenna is more likely to be not blocked from the common habit consideration of a user, or the upper computer determines to select the antenna which is more likely to be not blocked at the current moment based on the posture of the terminal equipment before the UWB chip sleeps and the posture change information of the terminal equipment provided by a gyroscope in the terminal equipment during the sleeping period of the UWB chip. (2) If the strategy is completely done by the UWB chip, the ANT_Sel value selected last before sleeping and stored in the AON can be selected. Because there is no other higher-level information that can be referenced, it is only assumed that no particularly large changes in the terminal product pose occur during this sleep.
A3, during the working period of the UWB chip after powering on or waking up from the sleep state, the state machine enters and stays in the initialization state until the first ranging starts, and jumps to enter the fast switching antenna state.
In the fast switching antenna state, starting from the beginning moment of the first ranging which enters the state, observing the received signal quality on the current working antenna in a time window with a certain length, judging that the current working antenna is blocked if any packet is not successfully received or the received packet is all CRC error in the time window, recording and setting a flag bit indicating that the signal quality of the antenna is poor, continuing to stay in the fast switching antenna state after switching the working antenna, and considering that the working antenna signal is poor and the signal quality of the other antenna is not considered to be very poor if the average signal strength is smaller than a certain threshold value and the previously recorded flag bit indicating that the signal quality of the other antenna is invalid in the time window, switching the antenna, otherwise, not switching the antenna, and clearing the flag bit (set as invalid) indicating that the signal quality of the two antennas is poor and jumping to the slow switching antenna state.
In the fast antenna switching state, any antenna switching can be really effective after a complete ranging process is finished, antenna switching does not occur in each ranging process, once a chip sleep instruction is received, firmware stores the last ANT_sel value before the sleep time and writes the value into the AON of the chip, and a flag bit (set as invalid) indicating that the signal quality of the two antennas is poor is cleared, and the initialization state is returned.
Specifically, in the fast switching antenna state, from the starting time of the first ranging into the state, the received signal quality on the current working antenna is observed in the following time window of the duration T1:
A31, in the application scene of ranging between the UWB terminal equipment and the opposite end single UWB equipment, if any packet is not successfully received or the received packet is all CRC error during the ranging, judging that the current working antenna is blocked, recording and setting a flag bit parameter bad_CQI (ANT_sel) =1 (indicating that the signal quality of the current working antenna is poor) of whether the signal quality of the current working antenna is poor, and continuing to stay in a fast switching antenna state after switching the working antenna (changing the ANT_sel value).
In the application scenario of ranging between the UWB terminal equipment and the plurality of UWB anchor points of the opposite terminal, if any packet is not successfully received or all received packets are CRC errors during the period, judging that the current working antenna is blocked, recording and setting a flag bit parameter bad_CQI (ANT_sel) =1 (indicating that the signal quality of the current working antenna is poor) whether the signal quality of the current working antenna is poor, and continuously staying in a fast switching antenna state after switching the working antenna (changing the ANT_sel value).
A32, under the application scene of ranging between the UWB terminal equipment and the opposite end single UWB equipment, if the packet is successfully received in the period, the signal strength Indicator (RECEIVED SIGNAL STRENGTH Indicator, RSSI) value reported by the received data packet in the T1 time window is subjected to statistical average to obtain the signal strength Indicator average value RSSI_Avg (ANT_Sel) of the current working antenna, and the signal strength Indicator average value is compared with the first threshold Th 1. If it isIf the current working antenna signal is poor and the other antenna is not considered to have very poor signal quality, the antenna is switched, otherwise, the antenna is not switched, a flag bit indicating that the signal quality of the two antennas is poor is cleared, namely, bad_CQI (0:1) =0 is set, and the antenna is switched to a slow-speed switching antenna state.
In the application scenario of ranging between the UWB terminal equipment and the plurality of UWB anchor points of the opposite end, during the ranging, if a packet is successfully received by each link between the terminal product and each anchor point, the received RSSI value in the T1 time window is statistically averaged and recorded, and the maximum value in the plurality of links is selected as the signal strength indication average value RSSI_Avg (ANT_Sel) of the current working antenna and is compared with the first threshold Th 1. If it isIf the current working antenna signal is poor and the other antenna is not considered to have very poor signal quality, the antenna is switched, otherwise, the antenna is not switched, a flag bit indicating that the signal quality of the two antennas is poor is cleared, namely, bad_CQI (0:1) =0 is set, and the antenna is switched to a slow-speed switching antenna state.
Wherein, the above parameters T1 and Th1 can be configured by the upper computer of the terminal device, and generally T1 can be configured to be relatively short, such as 50ms-500ms, and more preferably T1 is 100ms-200ms.
And A4, in the state of switching the antenna at a low speed, starting from the starting moment of the first ranging which enters the state, observing the quality of the received signal on the current working antenna in a time window with a certain length, judging that the current working antenna is blocked if any packet is not successfully received in the time window or the received packet is all CRC error, recording and setting a flag bit for indicating that the quality of the signal of the antenna is poor, switching the working antenna to the state of switching the antenna at a high speed, and if the packet is successfully received in the time window and if the average signal intensity is smaller than a certain threshold value, switching the antenna, otherwise, not switching the antenna, and continuing to stay in the state of switching the antenna at a low speed.
The method comprises the steps of firstly, if an antenna is determined to be very poor in signal quality in a fast switching antenna state, stopping in the fast switching antenna state, and if the antenna is determined to be poor in signal quality in the fast switching antenna state, clearing a flag bit with poor signal quality of all the antennas before jumping to a slow switching antenna state, and secondly, if the antenna is determined to be very poor in signal quality in the slow switching antenna state, jumping to the fast switching antenna state directly, so that in the slow switching antenna state, if the current working antenna signal is determined to be poor, whether another antenna is not determined to be very poor in signal quality is not needed, and the efficiency is improved to a certain extent.
In the state of slowly switching the antenna, any antenna switching can be really effective after the whole ranging process is finished, the antenna switching does not occur in each ranging process, once a chip sleep instruction is received, firmware stores the last ANT_Sel value before the sleep time and writes the value into the AON of the chip, and the flag bit (set as invalid) indicating that the signal quality of the two antennas is poor is cleared, and the initialization state is returned.
Specifically, in the slow-switching antenna state, from the starting time of the first ranging, the received signal quality on the working antenna is observed within the following time window of the duration T2:
A41 in the application scenario of ranging between the UWB terminal equipment and the opposite end single UWB equipment, if any packet is not successfully received or the received packet is all CRC error during the ranging, judging that the current working antenna is blocked, recording and setting a flag bit bad_CQI (ANT_sel) =1 (indicating that the antenna signal quality is Bad) of the current working antenna, and after switching the working antenna (changing the ANT_sel value), jumping to a fast switching antenna state.
In the application scenario of ranging between the UWB terminal equipment and the plurality of UWB anchor points of the opposite terminal, if any packet is not successfully received or all received packets are CRC errors during the period, judging that the current working antenna is blocked, recording and setting a flag bit bad_CQI (ANT_sel) =1 (indicating that the signal quality of the antenna is Bad) of the current working antenna, and after switching the working antenna (changing the ANT_sel value), jumping to a fast switching antenna state.
And A42, under the application scene of ranging between the UWB terminal equipment and the opposite end single UWB equipment, if the packet is successfully received in the period, carrying out statistical average on the RSSI value reported by the received data packet in the T2 time window to obtain the signal strength indication average value RSSI_avg (ANT_sel) of the current working antenna, and comparing with the second threshold Th 2. If rssi_avg (ant_sel) < Th2, the currently operating antenna signal is considered to be poor, the antenna is switched, otherwise the antenna is not switched, and then the slow switching antenna state is continued.
In the application scenario of ranging between the UWB terminal equipment and the plurality of UWB anchor points of the opposite end, during the ranging, if each link between the terminal equipment and each anchor point has a successfully received packet, the RSSI value reported by the data packet received in the T2 time window is statistically averaged and recorded, and the maximum value in the plurality of links is selected as the signal strength indication average value RSSI_avg (ANT_sel) of the current working antenna and is compared with a second threshold Th 2. If rssi_avg (ant_sel) < Th2, the currently operating antenna signal is considered to be poor, the antenna is switched, otherwise the antenna is not switched, and then the slow switching antenna state is continued.
Wherein, the above parameters T2 and Th2 can be configured by the upper computer of the terminal device, and generally T2 can be configured relatively long, such as 100ms-1s, and more preferably T2 is 500ms-600ms.
It should be noted that, no matter in the fast switching antenna state or the slow switching antenna state, any antenna switching action needs to wait until a complete ranging process is finished, and then the antenna switching action can not be really effective. During each ranging, no antenna switching occurs. For example, in a specific example, a complete ranging process includes both communication parties to recover a transmitting packet for 5-6 times, a period of time T1 may include, for example, 2-3 times of complete ranging processes, a period of time T2 may include, for example, ten times of complete ranging processes, if the period of time T1 for fast switching of the antenna state is still in a certain ranging process, the antenna switching action needs to be actually effective after the complete ranging process is finished, and similarly, if the period of time T2 for slow switching of the antenna state is still in a certain ranging process, the antenna switching action needs to be actually effective after the complete ranging process is finished.
In addition, once the instruction of the chip sleep is received, whether in the fast switching antenna state or the slow switching antenna state, the firmware saves the last ANT_sel value before the sleep time and writes the value into the AON of the chip, clears the flag bit (set as invalid) indicating that the signal quality of the two antennas is poor, and returns to the initialization state.
Based on the above description of the state machine, fig. 4 shows a specific example of the dynamic switching and state hopping sequence of the UWB chip antenna, and the behaviors of the state machine hopping and antenna switching at different times are described as follows:
At time t0, after the UWB chip is electrified or wakes up during sleep, the state machine enters an initialization state, flag bit parameters bad_CQI (0:1) indicating that the signal quality of the two antennas is poor are cleared, ANT_Sel is set to be a value 0 configured by the upper computer, namely, the antenna 0 is set as a current working antenna.
Starting the first ranging after the time t0 at the time t1, the state machine jumps from the initialized state to the fast switching antenna state.
Time T2 is reached after time T1 is counted from time T1. In this T1 time window, it is found that no data packet is received or that CRC of the received packet is completely erroneous, and thus the antenna 0 signal difference is determined, and bad_cqi (0) =1, ant_sel=1 (switching to antenna 1) is set, and the fast switching antenna state is continued.
The first ranging starts after time t3 and time t 2.
Time T4 is reached after time T1 is counted from time T3. In this T1 time window, successful reception of the packet is found, and the average rssi_avg (1) > Th1 is counted, so that it is also possible to determine the signal quality of antenna 1, and thus bad_cqi (0:1) =0 (clear antenna signal quality flag bit), ant_sel=1 (continue to use antenna 1), and jump to the slow switching antenna state.
The first ranging starts after time t5 and time t 4.
Time T6 is reached after time T2 is counted from time T5. In this T2 time window, successful reception of the packet is found, and the statistically averaged rssi_avg (1) > Th2 is calculated, so that it is possible to determine the signal quality of antenna 1, and thus to set ant_sel=1 (continue to use antenna 1), and continue to stay in the slow switching antenna state.
The first ranging starts after time t7 and time t 6.
Time T8 is reached after time T2 is counted from time T7. In this T2 time window, it is found that a packet was successfully received, but the statistically averaged rssi_avg (1) < Th2, and thus the antenna 1 signal quality is determined to be poor, ant_sel=0 (switching to antenna 0) is set, and the system continues to stay in the slow switching antenna state.
The first ranging starts after time t9 and time t 8.
Time T10 is reached after time T2 from time T9. In this T2 time window, it is found that no packet is received or that the received packet CRC is totally wrong, and thus the antenna 0 signal is judged to be very Bad, and bad_cqi (0) =1 and ant_sel=1 (switching to antenna 1) are set, and the fast switching antenna state is skipped.
The first ranging starts after time t10 at time t 11.
Time T12 is reached after time T1 is counted from time T11. In this T1 time window, successful reception of the packet is found, and the average rssi_avg (1) > Th1 is counted, so that it is also possible to determine the signal quality of antenna 1, and thus bad_cqi (0:1) =0 (clear antenna signal quality flag bit), ant_sel=1 (continue to use antenna 1), and jump to the slow switching antenna state.
The above description mainly aims at the application scene of arranging 2 UWB antennas for the terminal equipment, but the invention is not limited to the application scene of 2 UWB antennas, and the method can be intuitively expanded and applied to the application scene of the terminal equipment with more UWB antennas.
The antenna self-adaptive switching method of the UWB terminal equipment can accurately track the signal quality changes of different antennas in real time and switch the signals to the antennas with good signal quality, and ensures stable and reliable user experience all the time. And the method only judges whether the antenna needs to be switched or not and adaptively adjusts the frequency of the action of the antenna switching based on the signal quality statistical result of the current working antenna, so that the influence on the user experience caused by the fact that the antenna is switched too frequently and aggressively is avoided, and on the other hand, the antenna switching method and the operation are completely transparent and behind the scenes (except that the upper computer is required to configure some parameters) for the opposite terminal equipment which performs UWB communication with the terminal equipment and the upper protocol in the upper computer. The antenna switching method does not influence normal business processes such as power on and power off, sleep, wake-up, ranging and the like of a normal chip, and does not generate any additional packet sending/receiving actions on an air interface for assisting in realizing the method, namely the antenna switching action of the UWB terminal equipment realizes the wireless signal transmission of the air interface without influencing the normal, and is invisible to upper computer software and opposite terminal equipment in the terminal equipment.
The second embodiment of the invention discloses a computer readable storage medium storing a computer program, wherein the computer program is configured to be executed by a processor to perform the antenna adaptive switching method of the UWB terminal device in the first embodiment.
Alternatively, the storage medium may include, but is not limited to, a U disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, etc. various media in which a computer program can be stored.
The background section of the present invention may contain background information about the problem or environment of the present invention rather than the prior art described by others. Accordingly, inclusion in the background section is not an admission of prior art by the applicant.
The foregoing is a further detailed description of the invention in connection with specific/preferred embodiments, and it is not intended that the invention be limited to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the invention, and these alternatives or modifications should be considered to be within the scope of the invention. In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope as defined by the appended claims.

Claims (10)

1. An antenna self-adaptive switching method of UWB terminal equipment is characterized by comprising the following steps:
Entering a first switched antenna state in response to the start of the first ranging;
In the first switching antenna state, starting from the starting moment of the first ranging in the state, acquiring the received signal quality of the current working antenna in a first preset time period, and determining whether to switch the working antenna and jump to a second switching antenna state according to the received signal quality of the current working antenna in the first preset time period;
In the second switching antenna state, starting from the starting time of the first ranging in the state, acquiring the received signal quality of the current working antenna in a second preset time period, and determining whether to switch the working antenna and jump to the first switching antenna state according to the received signal quality of the current working antenna in the second preset time period;
the length of the first preset time period is smaller than that of the second preset time period.
2. The adaptive antenna switching method of a UWB terminal device according to claim 1, wherein said determining whether to switch the operating antenna and to jump to the second switched antenna state according to the received signal quality of the currently operating antenna within the first preset time period comprises:
And if not, acquiring signal strength indication values of all data packets received by the current working antenna in the first preset time period, confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the first preset time period, and jumping to the second switching antenna state.
3. The method for adaptive switching of an antenna of a UWB terminal device according to claim 2, wherein,
And if not, acquiring signal strength indication values of all data packets received by the current working antenna in the first preset time period, confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the first preset time period, setting the signal quality difference flag bit of all the antennas to be zero, and jumping to the second switching antenna state.
4. The adaptive antenna switching method of a UWB terminal device according to claim 2, wherein said determining whether to switch the operating antenna according to the signal strength indication values of all data packets received by the currently operating antenna in the first preset period of time includes:
and calculating the signal intensity indication average value of the current working antenna in the first preset time period according to the signal intensity indication values of all data packets received by the current working antenna in the first preset time period, judging whether the signal intensity indication average value of the current working antenna in the first preset time period is larger than or equal to a preset threshold value, if so, not switching the working antenna, if not, continuously judging whether the antennas with signal quality difference zone bit of zero exist in other antennas, if so, switching the working antenna, and if not, not switching the antennas.
5. The adaptive antenna switching method of a UWB terminal device according to claim 1, wherein said determining whether to switch the operating antenna and whether to jump to the first switched antenna state according to the received signal quality of the currently operating antenna within the second preset time period comprises:
and if not, acquiring signal strength indication values of all data packets received by the current working antenna in the second preset time period, confirming whether to switch the working antenna according to the signal strength indication values of all the data packets received by the current working antenna in the second preset time period, and continuing to stay in the second switching antenna state.
6. The method for adaptive switching of an antenna of a UWB terminal device according to claim 5,
And if not, acquiring signal strength indication values of all data packets received by the current working antenna in the second preset time period, calculating signal strength indication average values of the current working antenna in the second preset time period according to the signal strength indication values of all the data packets received by the current working antenna in the second preset time period, judging whether the signal strength indication average value of the current working antenna in the second preset time period is larger than or equal to a preset threshold value, if so, not switching the working antenna, and if not, switching the working antenna.
7. The antenna adaptive switching method of a UWB terminal device according to claim 4 or 6, wherein the preset threshold has a value ranging from [ -100dbm to-30 dbm ].
8. The adaptive switching method of an antenna of a UWB terminal device according to claim 1, wherein the first preset time period is 50ms-500ms and the second preset time period is 100ms-1s.
9. The antenna adaptive switching method of a UWB terminal device of claim 1, further comprising, prior to said entering the first switched antenna state in response to the start of the first ranging:
responding to the chip power-on of UWB terminal equipment, setting the signal quality difference zone bit of all antennas to zero, and selecting the current working antenna according to the configuration of the upper computer;
And responding to the wake-up of the chips of the UWB terminal equipment from the sleep state, setting the signal quality difference zone bit of all the antennas to be zero, and selecting the current working antenna according to the configuration of the upper computer or taking the last selected working antenna before the sleep state as the current working antenna.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program, wherein the computer program is arranged to be run by a processor to perform the antenna adaptive switching method of a UWB terminal device according to any of the claims 1-9.
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