Cell measurement methods, terminal equipment, chips, storage media, and software products

Abstract

This application provides a cell measurement method, terminal device, chip, storage medium, and program product, relating to the field of communication technology. When the cell on which the terminal device is camped or accessing is a problem cell, it helps to reduce the cell quality measured by the terminal device, thereby increasing the probability of the terminal device reselecting or handing over to another cell. The method includes: when the first cell is a problem cell, adjusting the input impedance of the antenna and the output impedance of the radio frequency circuit to a mismatched state at the frequency point of the first cell, where the first cell is a serving cell or a camped cell; acquiring the signal quality of the first cell; performing cell reselection based on the signal quality of the first cell; or, sending a first measurement report, the first measurement report including the signal quality of the first cell.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a cell measurement method, terminal equipment, chip, storage medium, and program product. Background Technology

[0002] To optimize network performance, idle terminal devices can perform cell reselection, while connected terminal devices can perform cell handover. However, in some scenarios, even if the cell where an idle terminal device is located (referred to as the "host cell") or the serving cell of a connected terminal device experiences co-channel interference, affecting the network status of the terminal device and even causing some services to malfunction, the terminal device may still be unable to reselect or handover to another cell. Summary of the Invention

[0003] This application provides a cell measurement method, terminal device, chip, storage medium, and program product. When the cell where the idle terminal device is camped or the serving cell of the connected terminal device is a problem cell, the terminal device can perform cell measurement on the cell under the condition of impedance mismatch between the antenna and the radio frequency circuit. This results in poor signal quality of the measured cell, thereby increasing the probability of the terminal device reselecting or switching to other cells and helping to optimize the network status of the terminal device.

[0004] In a first aspect, a cell measurement method is provided, applied to a terminal device, the terminal device including an antenna and a radio frequency circuit, the method comprising: when a first cell is a problem cell, adjusting the input impedance of the antenna and the output impedance of the radio frequency circuit to a mismatched state at the frequency point of the first cell, the first cell being a serving cell or a camping cell; acquiring the signal quality of the first cell; performing cell reselection based on the signal quality of the first cell; or, sending a first measurement report, the first measurement report including the signal quality of the first cell.

[0005] In one possible implementation, the method can be executed by the terminal device, or by components such as chips, chip systems, circuits, software and / or hardware modules in the terminal device, such as circuits or chips in the terminal device responsible for communication functions (e.g., modem chips, also known as baseband chips, or system-on-chip (SoC) chips or system-in-package (SIP) chips containing modem cores).

[0006] In this context, "first cell" can also be understood as the terminal device being in an idle state and the cell it is camped on being the first cell; "first cell" can also be understood as the terminal device being in a connected state and the cell it is camped on being the first cell, or as the terminal device having already accessed the first cell through a random access procedure.

[0007] The term "problem cell" can also be understood as follows: the serving cell of the terminal device is the first cell, or when the terminal device is camped on the first cell, the network condition of the terminal device may be poor, for example, the probability of service abnormalities (such as dropped calls) is higher. Alternatively, it can be understood as poor communication performance between the terminal device and the first cell, such as poor performance in demodulating messages from the first cell. In other words, the first cell may have performance or service quality issues. This application does not specifically limit this interpretation.

[0008] The mismatch between the antenna's input impedance and the RF circuit's output impedance can also be understood as an impedance mismatch between the antenna and the RF circuit. That is, the antenna's input impedance and the RF circuit's output impedance are not equal or not conjugate matched. This inequality can be either not completely identical or the absolute value of the difference exceeding a certain threshold.

[0009] Correspondingly, the matching state between the antenna's input impedance and the RF circuit's output impedance can also be understood as impedance matching between the antenna and the RF circuit. That is, the antenna's input impedance and the RF circuit's output impedance are equal or conjugate matched. This equality can be completely identical or very close, such as the absolute value of the difference being less than a certain threshold.

[0010] That is, in the embodiments of this application, compared with the impedance matching between the antenna and the radio frequency circuit, when the impedance between the antenna and the radio frequency circuit is mismatched, the difference between the input impedance of the antenna and the output impedance of the radio frequency circuit may be greater; it can also be understood that when the impedance between the antenna and the radio frequency circuit is mismatched, the reflected power (or reflection loss, etc.) of the signal may be greater.

[0011] Therefore, at the frequency point of the first cell, compared to impedance matching between the antenna and the RF circuit, when cell measurements are performed on the first cell with impedance mismatch between the antenna and the RF circuit, the measured signal quality of the first cell may be worse.

[0012] Therefore, when the first cell is the cell where the terminal device is camped in an idle state, optionally, cell reselection can be performed based on the signal quality of the first cell, including: the terminal device reselecting (or camping) to another cell other than the first cell (cells other than the first cell in the target cell list below). Alternatively, when the first cell is the serving cell of the terminal device in a connected state, optionally, the method further includes: the first cell sending message 5 to the terminal device, message 5 instructing the terminal device to switch to the target cell (which may be a neighboring cell of the first cell); correspondingly, the terminal device receives message 5 from the first cell.

[0013] In other words, the terminal device can switch or reselect from the problematic cell to another cell.

[0014] Obtaining the signal quality of the first cell can be achieved by performing cell measurements on the first cell. The signal quality of the first cell can include one or more of the following: RSRP, RSRQ, SINR, SNR, or RSSI.

[0015] It should be noted that cell reselection based on the signal quality of the first cell does not limit the terminal device to cell reselection based solely on the signal quality of the first cell. For example, it can also combine the signal quality of neighboring cells of the first cell. The first measurement report including the signal quality of the first cell does not limit the first side view report to only including the signal quality of the first cell. For example, it can also include the signal quality of neighboring cells of the first cell, etc.

[0016] The cell measurement method of this application allows the terminal device to adjust the input impedance of its antenna and the output impedance of its RF circuit to a mismatched state at the frequency point of the first cell when the first cell it is camped on or accesses is a problematic cell. This degrades the signal reception performance of the terminal device from the first cell, reducing the signal quality measured by the terminal device and thus increasing the probability of the terminal device reselecting or switching to another cell. This helps optimize the network condition of the terminal device and improves the user experience.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the terminal device further includes an adjustable unit, which includes one or more of the following: a capacitor, an inductor, or a resistor; adjusting the input impedance of the antenna and the output impedance of the radio frequency circuit to a mismatched state at the frequency point of the first cell includes: adjusting the adjustable unit at the frequency point of the first cell to adjust the input impedance of the antenna and the output impedance of the radio frequency circuit to a mismatched state.

[0018] The state of the adjustable unit can affect the input impedance of the antenna and / or the output impedance of the RF circuit. Therefore, by adjusting the adjustable unit at the frequency of the first cell, the input impedance of the antenna and the output impedance of the RF circuit can be adjusted to a mismatched state at the frequency of the first cell.

[0019] Optionally, the adjustable unit is a capacitor.

[0020] In this way, since capacitance values ​​are more likely to change than resistance and inductance values, terminal devices can more efficiently adjust the input impedance of the antenna to a mismatched state with the output impedance of the RF circuit.

[0021] In conjunction with the first aspect, in some implementations of the first aspect, adjusting the adjustable unit at the frequency of the first cell includes any one of the following: adjusting the adjustable unit to a first value at the frequency of the first cell; increasing the adjustable unit by a first offset value at the frequency of the first cell; or decreasing the adjustable unit by a second offset value at the frequency of the first cell.

[0022] Among them, one or more of the first value, the first offset value, or the second offset value can be preset. Alternatively, they can be values ​​determined by the terminal device based on a preset correspondence. The preset correspondence can be, for example, the first correspondence, the second correspondence, or the third correspondence as described below.

[0023] In this way, by adjusting the adjustable unit, the input impedance of the antenna and the output impedance of the RF circuit can be adjusted to a mismatched state at the frequency point of the first cell, thereby making the signal quality of the first cell measured by the terminal equipment poor.

[0024] In conjunction with the first aspect, in some implementations of the first aspect, the first cell is a stationary cell, and the terminal device is in an idle state; the first cell is a problem cell, including: the number of times the terminal device fails to access the first cell randomly is greater than or equal to the maximum number of times.

[0025] The maximum number of times can be configured in the first cell, predefined in the protocol, or preset in the terminal device.

[0026] For example, the terminal device can record the number of failed attempts to randomly access the first cell using a counter, such as a first counter; and each time a failure to access the first cell is determined, the first counter can be incremented by 1. After successful access to the first cell, or after triggering cell reselection (e.g., the number of failures is greater than or equal to the maximum number), the first counter can be reset to 0.

[0027] For example, in conjunction with method 400 below, after S404, the terminal device can determine that the number of failed attempts to randomly access the first cell is 2. After triggering cell reselection (executing S405), the terminal device can restart recording the number of failed attempts to randomly access the first cell, or reset the first counter to 0. Then, after S407, the terminal device can also determine that the number of failed attempts to randomly access the first cell is 2, and after triggering cell reselection (executing S408), the terminal device can restart recording the number of failed attempts to randomly access the first cell, or reset the first counter to 0.

[0028] It should be noted that this failure count can be understood as the number of consecutive failures of the terminal device in randomly accessing the first cell. Alternatively, it can be the number of failures of the terminal device in randomly accessing the first cell after the terminal device has performed initial synchronization with the first cell.

[0029] Thus, if the number of failed random access attempts to the first cell is greater than or equal to the maximum, the first cell can be considered a problematic cell, such as one with significant interference preventing the terminal device from successfully accessing it. Therefore, when the number of failed random access attempts to the first cell is greater than or equal to the maximum, the terminal device can trigger cell reselection. To enable the terminal device to reselect to a cell other than the first cell, before measuring the signal quality of the first cell, the terminal device can adjust the input impedance of the antenna and the output impedance of the RF circuit to a mismatched state at the frequency point of the first cell, thereby resulting in a lower measured signal quality for the first cell.

[0030] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: determining that random access to the first cell has failed based on the number of retransmissions of the first message being greater than or equal to a first threshold, wherein the first message is a message sent by the first cell during the random access process.

[0031] The first message may include message B in a two-step random access process, or message 2 and / or message 4 in a four-step random access process.

[0032] The first threshold can be the maximum number of retransmissions mentioned below. The fact that the number of retransmissions of the first message is greater than or equal to the first threshold can also be understood as: the terminal device fails to successfully receive the first message, causing the first cell to retransmit the first message until the number of retransmissions of the first message reaches the first threshold.

[0033] That is, the reasons for failure to randomly access the first cell include the number of retransmissions of the first message being greater than or equal to the first threshold. And when the number of failures to randomly access the first cell is greater than or equal to the maximum number, the number of failures to randomly access the first cell due to the number of retransmissions of the first message being greater than or equal to the first threshold is greater than or equal to the threshold 5.

[0034] Optionally, the number of retransmissions of the first message can be recorded by a second counter. This second counter can be, for example, called a retx counter. The number of retransmissions recorded by the second counter can be the number of retransmissions during a random access process. For example, the number of retransmissions of message 4 during the RACH failure process in S403 of method 400. When the terminal device successfully receives the first message, or when the number of retransmissions of the first message is greater than or equal to a first threshold, the terminal device can reset the second counter to 0. For example, when it is determined in S403 that the RACH process has failed, the terminal device can reset the second counter to 0 so that the number of retransmissions of the first message can be re-recorded during the RACH process in S404.

[0035] Since the terminal device may fail to receive the first message (such as message B, message 4 or message 2) from the network device due to co-channel interference in the first cell, this solution allows the terminal device to reduce the measured signal quality (such as RSRP) of the first cell by adjusting the adjustable unit on the frequency point of the first cell when co-channel interference exists, thereby making the probability of the terminal device reselecting to the first cell lower.

[0036] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: obtaining the signal quality of at least one neighboring cell of the first cell; performing cell reselection based on the signal quality of the first cell, including: performing cell reselection based on the signal quality of each cell in a target cell list, wherein the target cell list includes the first cell and some or all of the cells in at least one neighboring cell.

[0037] In this context, "at least one neighboring cell of the first cell" can also be understood as part or all of the cells of the first cell. For the sake of brevity, "at least one neighboring cell of the first cell" will be referred to as "the neighboring cells of the first cell" in the following text.

[0038] In other words, in addition to performing cell measurements on the first cell, the terminal device can also perform cell measurements on the neighboring cells (i.e., at least one neighboring cell) of the first cell. Furthermore, if the input impedance of the antenna and the output impedance of the RF circuit can be matched at the frequency points of the neighboring cells of the first cell, then the signal quality of the neighboring cells of the first cell measured by the terminal device may be relatively good.

[0039] Furthermore, since the input impedance of the antenna and the output impedance of the RF circuit are mismatched at the frequency of the first cell, the signal quality of the first cell measured by the terminal equipment may be poor.

[0040] The target cell list typically includes the first cell and its neighboring cells that meet the cell reselection criteria. Therefore, in some scenarios, the target cell list may not include the first cell, allowing the terminal device to avoid reselecting to it during cell reselection. Alternatively, the target cell list may include the first cell. However, since the signal quality of the first cell is measured under conditions of mismatch between the antenna's input impedance and the RF circuit's output impedance, the first cell could be a cell with relatively poor signal quality in the target cell list, thus reducing the probability of the terminal device reselecting to the first cell.

[0041] In conjunction with the first aspect, in some implementations of the first aspect, the first cell is a serving cell and the terminal device is in a connected state; before adjusting the adjustable unit on the frequency point of the first cell, the method further includes: sending a second measurement report, the second measurement report including the signal quality of the first cell.

[0042] It should be understood that cell handover decisions are typically made by network devices based on measurement reports submitted by terminal devices. Therefore, on the frequency point of the first cell, the terminal device may have already triggered measurement report submission, such as periodically submitting measurement reports, before adjusting the input impedance of the antenna and the output impedance of the RF circuit to a mismatched state.

[0043] Both the second and first measurement reports can include information about the signal quality of the first cell. However, the signal quality of the first cell in the two reports may differ. For example, the signal quality of the first cell in the first measurement report may be worse than that in the second measurement report.

[0044] In conjunction with the first aspect, in certain implementations of the first aspect, in the second measurement report, the signal quality of the first cell includes the SNR and / or SINR of the first cell; the first cell is a problem cell, including: the SNR of the first cell is less than or equal to a second threshold; and / or, the SINR of the first cell is less than or equal to a third threshold;

[0045] Alternatively, the signal quality of the first cell in the second measurement report includes the RSRP and RSRQ of the first cell, and the second measurement report also includes the RSRP and RSRQ of one or more neighboring cells of the first cell; the first cell is a problem cell, including: in the second measurement report, the absolute value of the difference between the RSRP of the first cell and the RSRP of the second cell is less than or equal to a fourth threshold, and the difference between the RSRQ of the second cell and the RSRQ of the first cell is greater than or equal to a fifth threshold, and the second cell is a cell among one or more neighboring cells.

[0046] The second threshold can be threshold a (described below); the third threshold can be threshold b (described below); the fourth threshold can be threshold 9 (described below); and the fifth threshold can be threshold 10 (described below). One or more neighboring cells of the first cell can also be understood as some or all of the cells of the first cell. The second cell can be one of the one or more neighboring cells, and may include multiple cells.

[0047] The method for identifying the first cell as a problem cell is similar to the implementation methods described in items 4 to 6 below.

[0048] Thus, if the second measurement report meets the above conditions, it indicates that the first cell may have issues such as co-channel interference, which may affect the network status of the terminal equipment. In this case, the terminal equipment can adjust the input impedance of the antenna and the output impedance of the RF circuit to a mismatched state at the frequency point of the first cell to reduce the signal quality of the first cell measured by the terminal equipment, thereby helping the terminal equipment to switch to other cells.

[0049] In conjunction with the first aspect, in some implementations of the first aspect, the signal quality of the first cell in the first measurement report includes the RSRP of the first cell, the signal quality of the first cell in the second measurement report includes the RSRP of the first cell, and the RSRP of the first cell in the first measurement report is less than the RSRP of the first cell in the second measurement report.

[0050] It is understandable that the signal quality of the first cell in the second measurement report can be measured when the antenna's input impedance matches the RF circuit's output impedance; conversely, the signal quality of the first cell in the first measurement report can be measured when the antenna's input impedance does not match the RF circuit's output impedance. Therefore, typically, the RSRP of the first cell in the first measurement report is less than the RSRP of the first cell in the second measurement report.

[0051] This makes it more likely that network devices will make decisions on cell handover based on the first measurement report.

[0052] In conjunction with the first aspect, in some implementations of the first aspect, the first cell is a problematic cell, including any one or more of the following: the bit error rate of receiving downlink messages is greater than or equal to the sixth threshold; the number of times downlink messages are not successfully received within the first time period is greater than or equal to the seventh threshold; or, the probability of not successfully receiving downlink messages within the second time period is greater than or equal to the eighth threshold.

[0053] The downlink message can be any message sent by the first cell, such as a message sent via PDSCH and / or PDCCH.

[0054] The sixth threshold can be threshold 6 as described below. The first duration can be duration 1 as described below, and the seventh threshold can be threshold 7 as described below. The second duration can be duration 2 as described below, and the eighth threshold can be threshold 8 as described below.

[0055] This indicates that the terminal device has poor performance in demodulating downlink messages, suggesting that there may be interference or other issues in the first cell.

[0056] In conjunction with the first aspect, in some implementations of the first aspect, after obtaining the signal quality of the first cell, the method further includes: adjusting the input impedance of the antenna and the output impedance of the radio frequency circuit to a matched state at the frequency point of the first cell.

[0057] In other words, after obtaining the signal quality of the first cell when the input impedance of the antenna and the output impedance of the RF circuit are mismatched, the terminal device can adjust the input impedance of the antenna and the output impedance of the RF circuit to match again at the frequency point of the first cell.

[0058] It should be noted that after reselecting or switching to another cell, the terminal device can also adjust the antenna's input impedance and the RF circuit's output impedance to match on the frequency of the first cell. Alternatively, after determining that the co-channel interference in the first cell is low, the antenna's input impedance and the RF circuit's output impedance can be adjusted to match on the frequency of the first cell. Determining that the co-channel interference in the first cell is low can include, for example, that the first cell's SNR and / or SINR are less than or equal to a certain threshold.

[0059] This makes it easier for subsequent terminal devices to receive signals from the first cell when the impedance between the antenna and the radio frequency circuit is matched.

[0060] In conjunction with the first aspect, in some implementations of the first aspect, the terminal device further includes a tuning circuit, which includes an adjustable unit; adjusting the input impedance of the antenna and the output impedance of the radio frequency circuit to a mismatched state at the frequency point of the first cell includes: the tuning circuit adjusting the adjustable unit at the frequency point of the first cell to make the input impedance of the antenna and the output impedance of the radio frequency circuit mismatched.

[0061] That is, the tuning circuit can adjust the adjustable unit at the frequency point of the first cell to make the input impedance of the antenna and the output impedance of the radio frequency circuit mismatched at the frequency point of the first cell.

[0062] In conjunction with the first aspect, in some implementations of the first aspect, the first cell is the serving cell, and the terminal device is in a connected state; after sending the first measurement report, the method further includes: receiving a second message from the first cell, the second message being used to indicate handover to the target cell, the first measurement report also including the signal quality of the target cell, the target cell being a neighboring cell of the first cell.

[0063] The second message is similar to message 5 below. That is, the first cell can decide whether to switch from the first cell to the target cell based on the first measurement report, for example, if the signal quality of the first cell and the signal quality of the target cell meet the cell handover threshold. Then the first cell can send the second message to the terminal device.

[0064] In this way, the terminal device can switch from the problem cell (first cell) to the target cell based on the second message, which helps to optimize the network status of the terminal device.

[0065] In a second aspect, a terminal device is provided, including: an antenna, a radio frequency unit, a tuning unit, and a processing unit, the device being connected to or residing in a first cell;

[0066] The tuning unit is used to adjust the input impedance of the antenna and the output impedance of the radio frequency unit to a mismatched state at the frequency point of the first cell when the first cell is a problem cell.

[0067] Antenna, used to receive the first signal from the first cell;

[0068] The tuning unit is used to tune the first signal to obtain a tuned signal. The tuned signal includes signals within the target frequency range of the first signal. The target frequency range is the frequency range corresponding to the frequency point of the first cell.

[0069] The radio frequency unit is used to amplify the tuned signal and convert the amplified tuned signal into an intermediate frequency signal or a baseband signal.

[0070] The processing unit is used to determine the signal quality of the first cell based on the intermediate frequency signal or the baseband signal.

[0071] Optionally, the terminal device can be the terminal device itself, or it can be a component such as a chip, chip system, circuit, software and / or hardware module in the terminal device.

[0072] It should be understood that the antenna is similar to antenna 801 described below; the radio frequency unit can also be called a radio frequency circuit, similar to radio frequency circuit 803 described below; the tuning unit can also be called a tuning circuit, similar to tuning circuit 802 described below. The processing unit may include baseband circuit 804, and the processing unit may also include other units, such as a digital signal processor, to determine the signal quality of the first cell, such as one or more of RSRP, RSRQ, SINR, SNR, or RSSI of the first cell.

[0073] The first signal is similar to the received signal described below. The first signal can be a reference signal or other signal suitable for cell measurement. Tuning processing can also be understood as the process of selectively receiving signals within a target frequency range from the first signal. The center frequency of the target frequency range can be the same as the frequency of the first cell, and the target frequency range can cover the target channel. The target channel can be the channel carrying the first signal, and the target frequency range may not include adjacent channels of the target channel. This allows the tuning processing to suppress signals on adjacent channels of the target channel, reducing interference.

[0074] In conjunction with the second aspect, in some implementations of the second aspect, the tuning unit includes an adjustable unit, which includes one or more of a capacitor, an inductor, or a resistor; adjusting the input impedance of the antenna to a mismatched state with the output impedance of the radio frequency unit includes any of the following: adjusting the adjustable unit to a first value at the frequency of the first cell; increasing the adjustable unit by a first offset value at the frequency of the first cell; or decreasing the adjustable unit by a second offset value at the frequency of the first cell.

[0075] Thirdly, a communication apparatus is provided for executing the method in any possible implementation of the first aspect described above. Specifically, the apparatus includes a module for executing the method in any possible implementation of the first aspect described above.

[0076] Fourthly, this application provides yet another communication device, including a processor coupled to a memory, which can be used to execute instructions in the memory to implement the method in any of the possible implementations of the first aspect described above. Optionally, the device further includes a memory. Optionally, the device further includes a communication interface, to which the processor is coupled.

[0077] In one implementation, the device is a terminal device. When the device is a terminal device, the aforementioned communication interface can be a transceiver, or an input / output interface.

[0078] In another implementation, the device is a chip configured in a terminal device. When the device is a chip configured in a terminal device, the aforementioned communication interface can be an input / output interface.

[0079] Fifthly, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, causing the processor to execute the method in any possible implementation of the first aspect described above.

[0080] In the specific implementation process, the processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, gate circuit, flip-flop, and various logic circuits. The input signal received by the input circuit can be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit can be output to, for example, but not limited to, a transmitter and transmitted by the transmitter. Furthermore, the input circuit and the output circuit can be the same circuit, which is used as the input circuit and the output circuit at different times. This application does not limit the specific implementation of the processor and various circuits.

[0081] In a sixth aspect, a processing apparatus is provided, including a processor and a memory. The processor is configured to read instructions stored in the memory and to receive signals via a receiver and transmit signals via a transmitter to execute the method in any of the possible implementations of the first aspect described above.

[0082] Optionally, the processor may be one or more, and the memory may be one or more.

[0083] Optionally, the memory may be integrated with the processor, or the memory may be separated from the processor.

[0084] In the specific implementation process, the memory can be a non-transitory memory, such as read-only memory (ROM), which can be integrated with the processor on the same chip or set on different chips. This application does not limit the type of memory or the way the memory and processor are set.

[0085] It should be understood that the relevant data interaction process, such as sending instruction information, can be a process of outputting instruction information from the processor, and receiving capability information can be a process of the processor receiving input capability information. Specifically, the processed output data can be output to the transmitter, and the input data received by the processor can come from the receiver. Here, the transmitter and receiver can be collectively referred to as transceivers.

[0086] The processing device in the sixth aspect above can be a chip or a chip system. The processor can be implemented in hardware or software. When implemented in hardware, the processor can be a logic circuit, an integrated circuit, etc. When implemented in software, the processor can be a general-purpose processor that reads software code stored in a memory. The memory can be integrated into the processor or located outside the processor and exist independently.

[0087] In a seventh aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code or instructions), which, when the computer program is run, causes a computer to perform the method in any of the possible implementations of the first and second aspects described above.

[0088] Eighthly, a computer-readable storage medium is provided that stores a computer program (also referred to as code or instructions) that, when executed on a computer, causes the computer to perform the methods in any of the possible implementations of the first and second aspects described above. Attached Figure Description

[0089] Figure 1 This is a schematic diagram of a communication system used in an embodiment of this application;

[0090] Figure 2 This is a flowchart illustrating a four-step random access method.

[0091] Figure 3 This is a flowchart illustrating a two-step random access method.

[0092] Figure 4 This is a flowchart illustrating a cell reselection method.

[0093] Figure 5 This is a flowchart illustrating a cell handover method.

[0094] Figure 6 A schematic flowchart of a cell measurement method provided in an embodiment of this application;

[0095] Figure 7 A schematic flowchart illustrating another cell measurement method provided in this application embodiment;

[0096] Figure 8 A schematic block diagram illustrating the hardware architecture of a terminal device provided in an embodiment of this application;

[0097] Figure 9 A schematic block diagram illustrating the hardware architecture of another terminal device provided in an embodiment of this application;

[0098] Figure 10Schematic block diagram of a communication device provided by an embodiment of the present application;

[0099] Figure 11 Schematic block diagram of another communication device provided by an embodiment of the present application. Detailed implementation manners

[0100] Next, the technical solutions in the present application will be described in conjunction with the accompanying drawings.

[0101] To facilitate the understanding of the embodiments of the present application, the following explanations are made first:

[0102] First, in some embodiments provided by the present application, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and effects. For example, the first value and the second value are only used to distinguish different values, and do not limit their order. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and terms such as "first" and "second" do not necessarily mean different.

[0103] It should be noted that in the embodiments of the present application, words such as "exemplarily" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the present application should not be construed as more preferred or more advantageous than other embodiments or designs. Exactly speaking, the use of words such as "exemplarily" or "for example" aims to present related concepts in a specific manner.

[0104] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one (item)" or similar expressions below refer to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple.

[0105] Second, for the convenience of understanding, multiple examples of information or indication information are provided in this article, such as the first indication information, the second indication information, etc. The order of transmission and names of these information are all examples and should not constitute any limitation to the present application.

[0106] Third, in the embodiments of this application, "instruction" can include direct instruction and indirect instruction, as well as explicit instruction and implicit instruction. The information indicated by a certain piece of information (as described below, the instruction information) is called the information to be instructed. In the specific implementation process, there are many ways to indicate the information to be instructed, such as, but not limited to, directly indicating the information to be instructed, such as the information to be instructed itself or its index. It can also indirectly indicate the information to be instructed by indicating other information, where there is a correlation between the other information and the information to be instructed; or it can only indicate a part of the information to be instructed, while the other parts are known or pre-agreed upon. For example, the instruction of specific information can be achieved by using a pre-agreed (e.g., protocol predefined) arrangement order of various pieces of information, thereby reducing the instruction overhead to a certain extent. This application does not limit the specific method of instruction.

[0107] Fourth, in the embodiments of this application, descriptions such as "when," "under the circumstances," "if," and "if" all refer to the fact that the device (e.g., network device or terminal device) will make corresponding processing under certain objective circumstances. They are not time limits, nor do they require the device (e.g., network device or terminal device) to make a judgment action when implementing it, nor do they imply any other limitations.

[0108] Fifth, the predefined terms in this application can be understood as: definition, pre-defined, storage, pre-storage, pre-negotiation, pre-configuration, solidification, or pre-firing.

[0109] Sixth, the technical solutions of the embodiments of this application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) system, 5th Generation (5G) system or New Radio (NR) system, and future evolution communication systems, such as 6th Generation (6G) system, etc.

[0110] Seventh, the terminal equipment in the embodiments of this application may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.

[0111] The terminal devices in this application embodiment may include handheld devices with communication functions, vehicle-mounted devices, etc. For example, some electronic devices include: mobile phones, tablets, PDAs, laptops, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving vehicles, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or future evolution of public land mobile communication networks. Terminal devices in a network (PLMN), etc., are not limited to this in the embodiments of this application.

[0112] By way of example and not limitation, in this embodiment, the electronic device can also be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for devices that utilize wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not merely hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are feature-rich, large in size, and can achieve complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses, as well as those that focus on a specific type of application function and require the use of other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0113] Furthermore, in this embodiment of the application, the electronic device can also be a terminal device in the Internet of Things (IoT) system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.

[0114] Eighth, the network devices in the embodiments of this application may include access network devices.

[0115] Access network equipment can be any device with wireless transceiver capabilities. Access network equipment includes, but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP) in a wireless fidelity (WiFi) system. It can also be a 5G base station (next-generation Node B, gNB) in a 5G system, such as NR, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or transmission point, such as a baseband unit (BBU) or a distributed unit (DU).

[0116] In some deployments, a gNB may include a centralized unit (CU) and a dedicated unit (DU). A gNB may also include an active antenna unit (AAU). The CU implements some of the gNB's functions, and the DU implements others. For example, the CU can handle non-real-time protocols and services, such as implementing the functions of the radio resource control (RRC) layer, the service data adaptation protocol (SDAP) layer, and / or the packet data convergence protocol (PDCP) layer. The DU can handle physical layer protocols and real-time services, such as implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. A DU can connect to only one CU or to multiple CUs, while a CU can connect to multiple DUs. Communication between CUs and DUs can be achieved via the F1 interface. The AAU can implement some physical layer processing functions, radio frequency processing, and active antenna-related functions. Since the information from the RRC layer is ultimately delivered to the PHY layer and thus becomes PHY layer information, or is transformed from PHY layer information, in this architecture, higher-level signaling, such as RRC layer signaling, can also be considered as being sent by the DU, or by the DU+AAU.

[0117] It is understood that access network equipment can be one or more of the following: CU nodes, DU nodes, and AAU nodes. Furthermore, a CU can be classified as an access network device in the radio access network (RAN) or as an access network device in the core network (CN); this application does not impose any limitations on this classification.

[0118] Access network equipment provides services to cells. Terminal devices communicate with cells through transmission resources (e.g., frequency domain resources, or spectrum resources) allocated by the access network equipment. The cell can belong to a macro base station (e.g., macro eNB or macro gNB) or to a base station corresponding to a small cell. Small cells can include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0119] To facilitate understanding of the embodiments of this application, some technical terms involved in this application will be introduced first.

[0120] 1. Cell

[0121] This is described from the perspective of resource management, mobility management, or service units. The coverage area of ​​each network device can be divided into one or more cells, and a cell can be considered as consisting of certain frequency domain resources. A cell can be an area within the coverage range of a network device's wireless network.

[0122] Different cells can correspond to different network devices. For example, the network devices belonging to cell A and cell C can be different network devices, such as base stations. That is to say, cell A and cell B can be managed by different base stations.

[0123] Alternatively, different cells can correspond to the same network equipment. The network equipment belonging to cell A and cell B can be the same equipment, such as different radio frequency processing units of the same base station. That is to say, cell A and cell B can be managed by the same network equipment, have the same baseband processing unit and intermediate frequency processing unit, but have different radio frequency processing units. This application does not make any special limitations in this regard.

[0124] 2. Serving cell and neighbor cell

[0125] The serving cell is the cell that currently provides service to the terminal device. A neighboring cell is a cell adjacent to the serving cell. The serving cell and neighboring cells may correspond to the same network equipment or different network equipment.

[0126] Furthermore, neighboring cells and serving cells may satisfy one or more of the following conditions: some or all of the cells in the neighboring cells may be intra-frequency cells of the serving cell; some or all of the cells in the neighboring cells may be inter-frequency cells of the serving cell; some or all of the cells in the neighboring cells may be cells of the same system as the serving cell, i.e., cells belonging to the same RAT; or, some or all of the cells in the neighboring cells may be cells of a different system than the serving cell, i.e., cells belonging to a different RAT.

[0127] 3. Cell reselection and cell handover

[0128] This can refer to the process by which a terminal device selects a more suitable cell in idle mode or idle state.

[0129] Community reselection includes:

[0130] Cell reselection within the same frequency band: Cell reselection within the same frequency band.

[0131] Inter-frequency cell reselection: Cell reselection between different frequency bands.

[0132] Cross-RAT reselection: Reselection between different RATs (such as from LTE to NR or from NR to LTE).

[0133] Cell handover is the process by which a connected terminal device switches from one cell to another.

[0134] 4. Reference signal received power (RSRP), reference signal received quality (RSRQ), signal to interference plus noise ratio (SINR), signal-to-noise ratio (SNR), and received signal strength indication (RSSI).

[0135] RSRP, RSRQ, SNR, SINR, and RSSI can be understood as key signal quality indicators that can be used to determine the quality and performance of a wireless link. Terminal equipment can perform measurements (also known as cell measurements or signal measurements) on the serving cell and / or neighboring cells to obtain the RSRP, RSRQ, SNR, SINR, and RSSI of the serving cell and / or neighboring cells.

[0136] RSRP refers to the average power of the reference signal received by a terminal device in a wireless network, and it is an important indicator for determining signal strength. RSRP can be used to determine cell coverage and signal strength, and can assist in cell selection and handover decisions.

[0137] RSRQ refers to the ratio of RSRP to RSSI, which reflects signal quality. RSRQ can be used to determine signal quality and interference, and can assist network equipment in cell selection, handover, and resource allocation.

[0138] SINR is the ratio of signal power to interference plus noise power. It indicates the clarity of a signal in interference and noise environments. SINR can be used to determine link quality and data transmission performance.

[0139] SNR is the ratio of signal power to noise power. It only considers the effect of random noise on the signal, and does not consider interference from other signals.

[0140] RSSI is a metric used to measure the strength of radio signals and can be used to assess the quality and strength of a signal. RSSI is typically calculated by the receiver when it receives a radio signal.

[0141] It should be understood that, in the embodiments of this application, signal quality can be represented based on one or more of RSRP, RSRQ, SINR, SNR, or RSSI. That is, the signal quality of a cell in the following text can be represented by one or more of the measured RSRP, RSRQ, SINR, SNR, or RSSI of the cell. For the sake of brevity, this will not be elaborated further in the following text.

[0142] It should also be understood that, in the embodiments of this application, the RSRP of an NR cell can also be referred to as the synchronization signal reference signal received power (SS-RSRP); the RSRQ of an NR cell can also be referred to as the synchronization signal reference signal received quality (SS-RSRQ); the SNR of an NR cell can also be referred to as the synchronization signal-to-noise ratio (SS-SNR), representing the signal-to-noise ratio related to the synchronization signal block (SSB) broadcast by the NR cell; and the SINR of an NR cell can also be referred to as the synchronization signal to interference plus noise ratio (SS-SINR). This application does not specifically limit these values.

[0143] Furthermore, ss-RSRP, ss-RSRQ, ss-SNR, and ss-SINR can be values ​​measured by the terminal device based on the synchronization signal block (SSB) from the NR cell. This application does not impose specific limitations on these values.

[0144] 5. Co-channel interference

[0145] Co-channel interference in a serving cell refers to the interference caused by signals from other cells on the same frequency in the serving cell. This interference affects communication quality, leading to unclear signal reception, reduced data transmission rates, and even dropped calls.

[0146] Inter-frequency interference in a serving cell refers to interference caused by signals from other cells at different frequencies. This interference is usually not due to signal collisions at the same frequency, but rather to leakage of signals from other frequencies or improper frequency planning.

[0147] 6. Synchronization signal block (PBCH block, SSB)

[0148] It forms the foundation for cell search. The SSB includes synchronization signals and the physical broadcast channel (PBCH). Synchronization signals include the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). The master information block (MIB) is transmitted on the PBCH, and terminal devices obtain the system information block (SIB) by reading the MIB information. The MIB carries scheduling information and other details related to the system information block.

[0149] 7. System Information Block 1 (SIB 1)

[0150] SIB 1 carries cell selection information, access control information, initial access-related channel configuration information, and scheduling information for the remaining system information blocks, which contain specific data. System messages are carried on a set of radio frames and can be broadcast via the broadcast channel (BCH). The BCH is a unidirectional control channel capable of broadcasting common cell information, and it consists of the frequency correction channel (FCCH), synchronization channel (SCH), and broadcast control channel (BCCH).

[0151] It should be understood that in the embodiments of this application, the terms and English abbreviations, such as RSRP and RSRQ, are merely exemplary examples given for ease of description and should not constitute any limitation on this application. This application does not preclude the possibility of defining other terms that can achieve the same or similar functions in existing or future agreements.

[0152] To facilitate understanding of the embodiments of this application, the following is combined with... Figure 1 The communication system applicable to the embodiments of this application will be described in detail.

[0153] Figure 1 A schematic diagram of a communication system 100 applying an embodiment of this application is shown. The communication system 100 includes at least one terminal device, such as... Figure 1 The terminal device 110 shown also includes at least one network device, such as... Figure 1 Network devices 120 and 130 are shown.

[0154] like Figure 1 As shown, the cells served by network device 120 may include cell A and cell B; the cells served by network device 130 may include cell C.

[0155] If terminal device 110 is located within the range of cell A, then the current serving cell of terminal device 110 is cell A, and it can communicate with cell A; cell B and cell C can be understood as neighboring cells of cell A.

[0156] In some scenarios, terminal device 110 can reselect and camp in a neighboring cell (cell B or cell C) through cell reselection; or, terminal device 110 can switch to a neighboring cell (cell B or cell C) through cell handover.

[0157] For example, assuming the terminal device is in an idle state, and the terminal device 110 can determine that cell C meets the S criterion through signal measurement, then the terminal device 110 can be reselected to cell C and can camp on cell C (or network device 130).

[0158] In another example, as the location of terminal device 110 moves, the signal strength of cell A weakens, and terminal device 110 can perform cell handover, such as handing over to cell B with better signal quality.

[0159] It should be noted that, Figure 1 For illustrative purposes only, when terminal device 110 reselects or switches from cell A to a neighboring cell (such as cell B or cell C), it can also be understood that terminal device 110 is located in both the geographical area corresponding to cell A and the geographical area corresponding to the neighboring cell. This allows the terminal device to reselect or switch to a neighboring cell. Figure 1 This does not constitute a limitation on the embodiments of this application.

[0160] It should be understood that, in the embodiments of this application, the interaction between the terminal device and the cell can refer to the interaction between the terminal device and the network device providing services to the cell. For example, in conjunction with... Figure 1 The interaction between the terminal device and cell C can be understood as the interaction between terminal device 110 and network device 130. For the sake of simplicity, this will not be elaborated further below.

[0161] Network devices and terminal devices can communicate via a wireless link. For example, network device 120 or network device 130 can communicate with terminal device 110 via a wireless link. Furthermore, terminal device 110, network device 120, or network device 130 can be configured with multiple antennas, which may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. Additionally, terminal device 110, network device 120, or network device 130 also includes a transmitter chain and a receiver chain. Those skilled in the art will understand that they may each include multiple components related to signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, or antennas). Therefore, network device 120 and network device 130 can communicate with terminal device 110 via multi-antenna technology.

[0162] It should be understood that Figure 1 This is just an illustration; the communication system 100 may also include other devices, such as wireless repeaters and wireless backhaul devices. Figure 1 Not shown in the image. Furthermore, Figure 1 The number of network devices and terminal devices shown is merely an example, and the embodiments of this application do not limit the number of network devices and terminal devices included in the communication system 100.

[0163] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, but the embodiments of this application are not limited thereto.

[0164] It should be understood that Figure 1 The communication system 100 shown is merely an example. This application does not limit the specific architecture of the applicable system, nor does it limit the number and form of various devices included in each communication system. For example, the number of neighboring cells can be greater; the number of cells served by each network device can also be greater or less. This application does not make any specific limitations in this regard.

[0165] Random access (RA) is a crucial process in wireless networks used to establish an initial connection between terminal devices and network devices. Since random access is implemented through a random access channel (RACH), which can be understood as a logical channel, the random access process can also be called the RACH process.

[0166] Currently, random access procedures can be implemented in two ways: a four-step random access procedure and a two-step random access procedure. The following sections will discuss these in conjunction with... Figure 2 and Figure 3 This paper provides a detailed explanation of the two random access processes from the perspective of device interaction.

[0167] Figure 2 This is a flowchart illustrating the four-step random access method 200. Method 200 can be applied to communication system 100. Figure 2 As shown, method 200 includes the following steps:

[0168] S201. The network device sends an SSB; correspondingly, the terminal device receives the SSB from the network device.

[0169] In this way, the terminal device can perform initial synchronization based on the SSB from the network device, which may include time-domain synchronization and / or frequency-domain synchronization. Furthermore, based on the SSB from the network device, the terminal device can determine the SIB scheduling information, thereby enabling the terminal device to listen to and receive SIBs from the network device, including SIB 1.

[0170] S202, the network device sends SIB 1, which may include parameters required by the terminal device during random access, such as time-frequency domain resource 1, which includes time-frequency resources and frequency domain resources used to send the preamble; correspondingly, the terminal device receives SIB 1 from the network device.

[0171] It should be understood that the information carried by SIB 1 shown in the embodiments of this application is only an example. In actual application scenarios, SIB 1 may carry more or less information, and this application does not make any specific limitations on this.

[0172] S203. On time-frequency domain resource 1, the terminal device sends message 1 (Msg 1) to the network device. Message 1 includes a preamble (also known as a random access preamble or preamble sequence). Correspondingly, the network device receives message 1 from the terminal device.

[0173] It should be understood that message 1 can be used to request random access, and message 1 can also be called a random access request, etc. This application does not specifically limit the name of message 1.

[0174] S204. In response to message 1, the network device sends message 2 (Msg 2) to the terminal device. Message 2 may include information indicating uplink (UP) resources and timing advance (TA). Correspondingly, the terminal device receives message 2 from the network device.

[0175] Uplink resources can be understood as time-frequency domain resources used to transmit uplink information (such as message 3). TA, also known as timing advance, can be used to adjust the uplink transmission timing of terminal devices to compensate for signal propagation delays between terminal devices and network devices.

[0176] It should be understood that message 2 can be understood as a response to message 1, and can also be called a random access response (RAR), random access preamble response, or preamble response, etc. This application does not specifically limit the name of message 2.

[0177] S205. Based on uplink resources and TA, the terminal device sends message 3 (Msg 3) to the network device. Message 3 may include: an RRC connection request and the identifier of the terminal device, etc. Correspondingly, the network device receives message 3 from the terminal device.

[0178] S206. The network device sends message 4 (Msg 4) to the terminal device, which includes the identifier of the terminal device that is allowed to access. Correspondingly, the terminal device receives message 4 from the network device.

[0179] Message 4 may include the connection resolution result. If the identifier of the allowed terminal device in Message 4 is the same as the identifier of the terminal device in Message 3, it indicates that the terminal device has successfully connected; otherwise, it indicates that the terminal device has failed to connect.

[0180] Figure 3 This is a flowchart illustrating the two-step random access method 300. Method 300 can be applied to communication system 100. Figure 3 As shown, method 300 includes:

[0181] S301, The network device sends an SSB; correspondingly, the terminal device receives the SSB from the network device.

[0182] S302, The network device sends SIB 1; correspondingly, the terminal device receives SIB 1 from the network device.

[0183] It should be understood that the implementation methods of S301 to S302 are similar to those of S201 to S202, and can be referred to the description above, which will not be repeated here.

[0184] S303. Based on the time-frequency domain resources indicated in SIB 1, the terminal device sends message A (Msg A) to the network device. Message A may include a preamble, an RRC connection request, and the identifier of the terminal device, etc. Correspondingly, the network device receives message A from the terminal device.

[0185] It should be understood that message A contains information similar to that included in messages 1 and 3 in method 200. Furthermore, message A can also be referred to as a random access request, etc. Please refer to the description in method 200; it will not be repeated here.

[0186] S304. The network device sends message B to the terminal device. Message B may include the identifier of the terminal device that is allowed to access and its TA, etc. Correspondingly, the terminal device receives message B.

[0187] It should be understood that message B contains content similar to that of messages 2 and 4 in method 200. Refer to the description in method 200; it will not be repeated here.

[0188] It should also be understood that the information carried in each message in methods 200 and 300 is only an example. In actual application scenarios, the information carried in each message may be more or less. For example, message B may also carry a temporary cell radio network temporary identifier (C-RNTI). This application embodiment does not specifically limit this.

[0189] After a terminal device establishes a connection with a network device through the RACH procedure, it can be understood that the terminal device enters a connected state, or that the terminal device has accessed the network device. The network device can then provide network services to the terminal device, enabling it to perform various business operations.

[0190] However, in some scenarios, the terminal device may fail to complete the RACH process, or interpret the RACH process as a failure, resulting in the terminal device failing to establish a connection with the network device. This prevents the terminal device from performing normal services and impacts user experience. Specifically, this can be seen in... Figure 4 The process is shown in the diagram.

[0191] Figure 4 This is a flowchart illustrating a cell reselection method 400. Figure 4 As shown, method 400 includes the following steps:

[0192] S401, The network device sends an SSB; correspondingly, the terminal device receives the SSB from the network device.

[0193] S402, The network device sends SIB 1; correspondingly, the terminal device receives SIB 1 from the network device.

[0194] It should be understood that the implementation methods of S401 to S402 are similar to those of S201 to S202, and can be referred to the description above, which will not be repeated here.

[0195] S403. The terminal device attempts to access the first cell via the RACH procedure. However, the RACH procedure fails, meaning the terminal device does not successfully access the first cell.

[0196] The RACH process can be a four-step RACH process. Analysis shows that the RACH process fails because the number of times the terminal device fails to receive message 4 or message 2 reaches a certain threshold. That is, in the four-step RACH process, if the terminal device fails to receive message 4 or message 2, the network device can retransmit message 4 or message 2, and the network device can record the number of times message 4 or message 2 is retransmitted to the terminal device. If the number of times the network device retransmits message 4 or message 2 reaches the maximum retransmission count (e.g., 3 times), and the terminal device still fails to receive message 4, then the network device can determine that the RACH process has failed and can instruct the terminal device to initiate the RACH process again, as shown in S404. Furthermore, the network device can reset the recorded number of retransmissions of message 4 or message 2, for example, to 0, so as to correctly record the number of retransmissions of message 4 or message 2 in subsequent RACH processes.

[0197] Alternatively, the RACH process can be a two-step RACH process, and analysis can determine that the RACH process failed because the number of times the terminal device failed to receive message B reached a certain threshold. That is, in a four-step RACH process, if the terminal device fails to receive message B, the network device can retransmit message B; if the number of times the network device retransmits message B reaches the maximum retransmission count (e.g., 3 times), and the terminal device still fails to receive message B, then the network device can determine that the RACH process has failed, and the terminal device can initiate the RACH process again, as shown in S404. Furthermore, the network device can reset the recorded number of retransmissions of message B, for example, to 0, so as to correctly record the number of retransmissions of message B in subsequent RACH processes.

[0198] S404. The terminal device initiates the RACH procedure again. However, the RACH procedure still fails, meaning the terminal device has not yet successfully accessed the first cell.

[0199] It should be understood that the implementation of S404 is similar to that of S403, and can be referred to the description above, so it will not be repeated here.

[0200] If the number of failures in the RACH process reaches the upper limit, that is, if the number of failures in the RACH process is greater than or equal to the maximum number, such as 2 times, then the terminal device can perform the cell reselection process, that is, the terminal device executes S405.

[0201] The maximum number of consecutive failures for a terminal device in an idle state to randomly access the first cell can be considered the maximum number of times it has failed. When the maximum number of consecutive failures is reached, the terminal device can enter the cell reselection process and reset the failure count to 0. This ensures that the failure count for random access to the first cell is correctly recorded after cell reselection, thus triggering the cell reselection process normally.

[0202] It should be understood that the maximum number of retransmissions and the maximum number of times shown above are examples. In actual application scenarios, the maximum number of retransmissions and / or the maximum number of times can be other values. Furthermore, the maximum number of retransmissions and / or the maximum number of times can be parameters pre-installed in the terminal device, parameters configured by the network device (such as the first cell) through signaling, or parameters predefined by the protocol. This application does not impose specific limitations on these parameters.

[0203] S405, The terminal device performs cell reselection.

[0204] It is understandable that the cell reselection process may include: the terminal device selecting a target cell from the target cell list for subsequent access to that target cell. Typically, the target cell selected by the terminal device can be a cell with good signal quality from the target cell list, such as the cell with the highest RSRP, or one of the three cells with the highest RSRP.

[0205] However, in some scenarios, if the RSRP of the first cell is one of the Y cells with the largest RSRP in the target cell list, where Y is a positive integer, such as 1, 2, or 3, then the terminal device may reselect to the first cell.

[0206] This can cause the terminal device to repeat processes S403 to S405, such as S406 to S408. The implementation of S406 to S408 is similar to that of S403 to S405, causing the terminal device to be stuck in a loop of RACH process failure and cell reselection to the first cell. As a result, the terminal device cannot access the network in a timely manner, cannot perform services normally, and has a poor user experience.

[0207] In this situation, analysis of the RSRP, RSRQ, and SINR of the first cell measured by the terminal device reveals that although the RSRP of the first cell is high (e.g., above a certain threshold, or among the Y cells with the highest RSRP in the target cell list), its RSRQ and / or SINR may be low (e.g., below a certain threshold, or among the K cells with the lowest RSRQ and / or SINR in the target cell list, where K is a positive integer such as 1, 2, or 3). This indicates that the interference and noise in the first cell may be significant, such as substantial co-channel interference, affecting the signal reception performance of the terminal device and causing it to repeatedly fail to receive messages 4, 2, or B, leading to RACH process failure.

[0208] However, when the terminal device determines that the RACH process has failed and thus triggers cell reselection, the terminal device may still choose the first cell as the cell with the larger RSRP in the target cell list, and thus reselect to the first cell again, so that the terminal device is in a cycle of RACH process failure and cell reselection to the first cell.

[0209] In other scenarios, even if a terminal device accesses the first cell via a four-step or two-step RACH process, issues such as co-channel interference in the first cell can affect the terminal device's reception of downlink data from the first cell. For example, the probability of the terminal device successfully receiving data (or PDSCH data) sent by the first cell via PDSCH is low, thus affecting the normal operation of the terminal device's services. Specifically, this can be seen in... Figure 5 The process is shown in the diagram.

[0210] Figure 5 This is a flowchart illustrating a cell handover method 500. (Example) Figure 5 As shown, method 500 includes the following steps:

[0211] S501, The network device sends an SSB; correspondingly, the terminal device receives the SSB from the network device.

[0212] S502, the network device sends SIB 1; correspondingly, the terminal device receives SIB 1 from the network device.

[0213] It should be understood that the implementation methods of S501 to S502 are similar to those of S201 to S202, and can be referred to the description above, which will not be repeated here.

[0214] S503. The terminal device accesses the first cell via the RACH procedure (which can be a four-step RACH procedure or a two-step RACH procedure). The terminal device then enters the connected state. Prior to accessing the first cell, the terminal device was in the idle state.

[0215] The terminal equipment can periodically or in other ways configured for the first cell to perform cell measurements on the first cell, and can also periodically or in other ways configured for the first cell to perform cell measurements on the neighboring cells of the first cell to obtain the signal quality of the first cell and the neighboring cells, such as RSRP and RSRQ.

[0216] S504. When a measurement report is triggered, the terminal device may send a measurement report to the first cell; correspondingly, the first cell receives the measurement report from the terminal device. The measurement report includes the signal quality of the first cell and the signal quality of neighboring cells, such as the RSRP and RSRQ of the first cell, and the RSRP and RSRQ of neighboring cells, etc.

[0217] It should be understood that measurement reports may be triggered by, but are not limited to, measurement events such as A1, A2, A3, A4, A5, A6, B1, or B2. This application does not specifically limit this.

[0218] S505, for the first cell, the decision-making terminal equipment does not perform cell handover based on the measurement report.

[0219] In other words, cell handover is typically decided by network equipment. Furthermore, network equipment usually bases its decisions on certain threshold values ​​for terminal devices to perform cell handover; these threshold values ​​can also be called cell handover thresholds. Therefore, if the signal quality of the first cell does not meet the cell handover threshold, the network equipment decides not to perform cell handover. Cell handover thresholds may include, for example, threshold 1 and / or threshold 2, etc.

[0220] If the following conditions are not met, the first cell may decide not to perform a cell handover: the difference between the RSRP of the best neighbor cell and the RSRP of the first cell is greater than or equal to threshold 1, and the best neighbor cell can be the cell with the largest RSRP among the neighbor cells of the first cell; and / or, the RSRP of the first cell is less than or equal to threshold 2, etc.

[0221] For example, assume that the signal quality of the first cell and the signal quality of the neighboring cells reported by the terminal device are shown in Table 1.

[0222] In this scenario, the Physical Cell Identity (PCI) of the first cell (serving cell) can be 276. Therefore, the RSRP of the first cell (serving cell) measured by the terminal device is -94.30 dBm, and the RSRQ is -17.02 dB. Cells with PCIs of 40, 39, 860, and 589 can be considered neighboring cells of the first cell. Among the neighboring cells of the first cell, the cell with PCI 589 has the best signal quality and can be considered the optimal neighbor, with an RSRP of -92.16 dBm and an RSRQ of -14.60 dB.

[0223] The RSRP of the best neighboring cell (the neighboring cell with a PCI of 589) is 2dB higher than that of the first cell. This indicates that the signal strength of the best neighboring cell is close to that of the first cell. The network device can decide not to perform a cell handover based on this 2dB difference being less than a threshold of 1. Alternatively, the network device may also decide not to perform a cell handover based on the RSRP of the first cell being greater than a threshold of 2.

[0224] However, comparing the first cell with a neighboring cell of PCI 860, the RSRP of the first cell is close to that of the neighboring cell, with a difference of less than 0.2 dB, indicating that the signal strengths of the first cell and the neighboring cell are similar. However, the RSRQ of the first cell is 1.5 dB lower than that of the neighboring cell. This suggests that the first cell may experience greater interference compared to the neighboring cell, such as co-channel interference. This results in poor reception performance for the terminal device within the first cell. However, because the RSRP of the first cell is higher, the network equipment decides not to perform cell handover, which may cause service interruptions due to poor reception performance, thus affecting the user experience.

[0225] Table 1

[0226] index PCI RSRP / dBm RSRQ / dB 0 40 -93.20 -16.55 1 39 -96.92 -18.24 2 860 -94.44 -15.67 3 589 -92.16 -14.60 4 276 -94.30 -17.02

[0227] Therefore, as can be seen from method 400, when a terminal device in an idle state is camped on the first cell, if the RSRP of the first cell is high and there are problems such as co-channel interference in the first cell, the terminal device may be unable to successfully access the first cell through the random access procedure, and may also be unable to reselect to a cell other than the first cell, resulting in network abnormalities for the terminal device.

[0228] As can be seen from Method 500, after the terminal device accesses the first cell, if the RSRP of the first cell is high and there are issues such as co-channel interference in the first cell, the terminal device may fail to successfully receive some downlink data; furthermore, due to the high RSRP of the first cell, the network device may also decide not to perform cell handover for the terminal device, causing some services of the terminal device to malfunction.

[0229] Furthermore, in the scenario shown in method 500, optionally, when the terminal device reports a measurement report to the network device, the terminal device can call interface 1 to update the RSRP of the first cell measured by the terminal device to a lower value, such as the updated RSRP; and the terminal device can report the updated RSRP through the measurement report. This ensures that the updated RSRP meets the cell handover threshold, thereby enabling the network device to decide whether the terminal device should perform a cell handover, that is, to decide whether the terminal device should hand over from the first cell to a neighboring cell.

[0230] Interface 1 can be understood as an interface provided by the chip manufacturer. In some scenarios, the terminal device may fail to successfully call this interface, preventing it from updating the measured RSRP of the first cell to a lower value. Consequently, the network device may still decide not to perform a cell handover, causing the terminal device to remain connected to the first cell. Due to co-channel interference in the first cell, the terminal device's downlink data reception performance is poor, with a low probability of successful downlink data reception. This affects the normal operation of the terminal device's services, potentially causing service interruptions and a poor user experience.

[0231] Therefore, there is an urgent need to provide a method that allows a terminal device in an idle state, camped on a first cell, to avoid reselecting to the first cell if it determines that the first cell has a problem (e.g., co-channel interference); or, if the terminal device accesses the first cell and determines that the first cell is a problem cell (e.g., co-channel interference), the terminal device can switch from the first cell to another cell. This would help enable the terminal device to reselect to or switch to a cell with better signal quality, allowing the terminal device's services to operate normally and thus improving the user experience.

[0232] In view of this, this application provides a cell measurement method. When a terminal device accesses or camps on a first cell, if the first cell is determined to be a problem cell, the terminal device can adjust adjustable units, such as capacitors and inductors, at the frequency point of the first cell to cause impedance mismatch between the antenna and the radio frequency circuit at the frequency point of the first cell. This reduces the performance of the terminal device in receiving signals from the first cell, thereby reducing the signal quality of the first cell measured by the terminal device, such as a decrease in RSRP.

[0233] In this way, since the signal quality of the first cell measured by the terminal device is relatively low, it helps the network equipment decide whether the terminal device should hand over to another cell; or, it helps the terminal device reselect to a cell other than the first cell. When the communication quality between the terminal device and the first cell is poor due to co-channel interference or other issues, it helps the terminal device hand over to another cell or reselect to a cell other than the first cell, thereby improving the network condition of the terminal device, enabling services to operate normally, and thus improving the user experience.

[0234] The following describes in detail the cell measurement method provided in this application embodiment, taking a terminal device and a first cell as the implementing entities. The specific forms and quantities of the devices shown are merely examples and should not constitute any limitation on the implementation of the method provided in this application.

[0235] The terminal device in this application embodiment can be the terminal device itself, or a chip, chip system, or processor that supports the terminal device in implementing the cell measurement method, or a logic module or software that can implement all or part of the terminal device functions; the network device in this application embodiment can be the network device itself, or a chip, chip system, or processor that supports the network device in implementing the cell measurement method, or a logic module or software that can implement all or part of the network device functions. This application does not impose specific limitations on this.

[0236] It should be noted that, in this embodiment, the interaction between the terminal device and the cell is the interaction between the terminal device and the network device corresponding to the cell. The network device corresponding to the cell can be understood as the network device serving the cell, or the network device's coverage area including the cell. For simplicity, this will not be elaborated further below.

[0237] The following section provides a detailed explanation of the cell measurement method, using terminal devices as the primary means of execution.

[0238] Figure 6 This is a flowchart illustrating a cell measurement method 600 provided in an embodiment of this application. Method 600 is applicable to a communication system 100. Method 600 can be understood as a cell measurement method when the terminal device is in an idle state.

[0239] like Figure 6 As shown, method 600 includes the following steps:

[0240] S601. When a terminal device in an idle state and camped on the first cell determines that the first cell is a problem cell, the terminal device adjusts the adjustable unit on the frequency point of the first cell so that the impedance between the antenna and the radio frequency circuit is mismatched on the frequency point of the first cell.

[0241] The term "problem cell" can also be understood as indicating poor communication quality between the terminal device and the first cell, such as the terminal device failing to successfully receive messages from the first cell. Optionally, determining the first cell as a problem cell includes: the number of times the terminal device has failed to randomly access the first cell is greater than or equal to the maximum number of failures.

[0242] It should be understood that the implementation method for the terminal device to determine that the number of failed random accesses to the first cell is greater than or equal to the maximum number is similar to the implementation methods of S401 to S404 in method 400, and can be referred to the description above, which will not be repeated here.

[0243] Under normal circumstances, before the terminal device adjusts the adjustable unit on the frequency point of the first cell, the impedance matching between the antenna and the RF circuit on the frequency point of the first cell is optimal. In other words, the signal quality received by the terminal device from the first cell is best under these conditions. Therefore, to degrade the signal quality of the first cell measured by the terminal device, the terminal device can adjust the adjustable unit, thereby causing an impedance mismatch between the antenna and the RF circuit on the frequency point of the first cell, thus reducing the measured signal quality.

[0244] S602. In the case of impedance mismatch between the antenna and the RF circuit at the frequency point of the first cell, perform cell measurement and determine the target cell list and the signal quality of each cell in the target cell list.

[0245] Signal quality may include one or more of RSRP, RSRQ, SINR, SNR, or RSSI.

[0246] It should be understood that the terminal device performs cell reselection based on the signal quality of each cell in the target cell list. The terminal device typically selects a cell with relatively good signal quality from the target cell list. Therefore, to enable the terminal device to reselect to a cell other than the first cell, the purpose of adjusting the adjustable unit is to make the signal quality (e.g., RSRP) of the first cell appear as a relatively poor cell in the target cell list. For example, this could be achieved by ranking the first cell's signal quality lower in the target cell list (a higher ranking indicates better signal quality), thereby reducing the probability of the terminal device reselecting to the first cell.

[0247] In other words, the terminal device can adjust the adjustable unit at the frequency of the first cell, causing an impedance mismatch between the antenna and the RF circuit at that frequency, resulting in poor signal quality for the terminal device receiving signals from the first cell. Furthermore, after adjusting the adjustable unit, the terminal device performs cell measurements, thereby reducing the measured signal quality of the first cell, such as a decrease in RSRP, so that the terminal device can select cells outside the target cell list.

[0248] The target cell list can be generated by the terminal device by combining the measurement results of cell measurement and the parameters configured in the first cell (such as cell reselection priority, cell reselection related thresholds, etc.), and the target cell list can include one or more cells that meet the cell reselection conditions.

[0249] It should be understood that cell reselection conditions may include one or more of the following: RSRP greater than a certain threshold; RSRQ greater than a certain threshold; RSSI greater than a certain threshold; priority greater than a certain threshold; or, cell load is low, such as the number of terminals served being less than a certain threshold. Alternatively, in actual application scenarios, cell reselection conditions may also include other conditions, which are not specifically limited in this application.

[0250] It should be noted that even if the terminal device determines that the first cell is a problem cell, such as when the number of failed attempts to access the first cell has reached the limit, the first cell can still be included in the target cell list. Alternatively, since the cells in the target cell list are usually cells that meet the cell reselection criteria, in some scenarios, the first cell may not be included in the target cell list, allowing the terminal device to avoid reselecting to the first cell during cell reselection. This application does not impose specific limitations on this.

[0251] Furthermore, the target cell list can be a list of cells sorted by signal quality, and for example, it can be a list of cells sorted from best to worst signal quality. The higher a cell ranks in the target cell list, the better its signal quality, and the higher the probability that the terminal device will reselect that cell during cell reselection. Therefore, the purpose of adjusting the adjustable unit in the terminal device is to make the first cell rank lower in the target cell list.

[0252] S603, The terminal device performs cell reselection based on the target cell list.

[0253] For example, the terminal device can reselect to the cell with the best signal quality in the target cell list, such as the cell with the highest RSRP. If the signal quality of the first cell is not the best in the target cell list, such as the RSRP of the first cell not being the cell with the highest RSRP in the target cell list, the terminal device can reselect to a cell other than the first cell.

[0254] The cell measurement method of this application, when a terminal device in an idle state is camped on a first cell, if the terminal device determines that the first cell is a problem cell, the terminal device can adjust the adjustable unit on the frequency point of the first cell to reduce the signal quality of the first cell as measured by the terminal device. This makes the first cell appear as a cell with relatively poor signal quality in the target cell list obtained by the terminal device, for example, by making the signal quality of the first cell rank lower in the target cell list (a higher ranking indicates better signal quality), thereby reducing the probability of the terminal device reselecting to the first cell. This reduces the probability of the terminal device reselecting to a problem cell, thus helping the terminal device to reselect to other cells with better signal quality.

[0255] The following explains how to adjust the adjustable unit of the terminal device.

[0256] To facilitate understanding, we will first explain the adjustable unit. An adjustable unit is a module used to adjust the impedance mismatch between the antenna and the radio frequency circuit; it can be understood as software, hardware, or a combination of both. Furthermore, the adjustable unit can also be a component, circuit, device, switch, etc.

[0257] For example, the adjustable unit may include one or more of an inductor, capacitor, or resistor. By adjusting one or more of these components at the frequency of the first cell, an impedance mismatch can be achieved between the antenna and the radio frequency circuit at the frequency of the first cell.

[0258] Optionally, the adjustable unit may include a capacitor. This allows the terminal device to more efficiently adjust the impedance mismatch between the antenna and the RF circuit at the frequency of the first cell, since the capacitance value is more easily varied than that of resistance and inductance. Furthermore, because capacitors are typically small, the adjustable unit occupies less space.

[0259] Adjusting the adjustable unit on the frequency of the first cell includes any one or more of the following feasible methods.

[0260] The first feasible method is to adjust the adjustable unit to the first value on the frequency of the first cell.

[0261] The first value can be a preset value.

[0262] For example, the first value can be the maximum or minimum value within the adjustable range of the adjustable unit. The adjustable range can be a preset range. Furthermore, when the adjustable unit is at the first value, the signal quality of the first cell measured by the terminal device may typically be low. For example, it can be determined through simulation experiments that when the adjustable unit is adjusted to the first value at the frequency point of the first cell, the signal quality of the first cell measured by the terminal device is typically poor, for example, satisfying the first or second condition below.

[0263] Alternatively, the first value can be determined based on a first correspondence. The first correspondence includes the correspondence between the first value and a first range. This first correspondence can be preset in the terminal device. The first range can be understood as a range with poor signal quality; for example, when the signal quality of the first cell falls within the first range, the first cell is typically one of the cells with the worst signal quality in the target cell list.

[0264] The terminal device can then adjust the adjustable unit to a first value on the frequency point of the first cell based on the first correspondence, thereby ensuring that the signal quality of the first cell measured by the terminal device falls within a first range. Furthermore, the first correspondence can be, for example, a correspondence set based on experience. For instance, simulation experiments might determine that when the adjustable unit is set to a first value on the frequency point of the first cell, the signal quality of the first cell measured by the terminal device typically falls within a first range.

[0265] The second feasible method is to increase the first offset value of the adjustable unit on the frequency point of the first cell.

[0266] The first offset value can be a preset value. For example, before the terminal device executes S601, the tuning module has an initial value at the frequency of the first cell, which could be a value that matches the impedance between the antenna and the radio frequency circuit. After the terminal device increases the first offset value of the adjustable unit, the adjustable unit becomes the sum of the initial value and the first offset value.

[0267] For example, it can be determined through simulation experiments or other means that, at the frequency point of the first cell, after the adjustable unit is increased by a first offset value from its initial value, the signal quality of the first cell measured by the terminal device is usually poor, for example, satisfying the first or second item below.

[0268] Alternatively, the first offset value can be determined based on a second correspondence. The second correspondence includes the correspondence between the first offset value and a second range. This second correspondence can be preset in the terminal device. The second range can be understood as a range with poor signal quality; for example, when the signal quality of the first cell falls within the second range, the first cell is typically one of the cells with the worst signal quality in the target cell list.

[0269] Then, based on the second correspondence, the terminal device can increase the first offset value of the adjustable unit on the frequency point of the first cell, so that the signal quality of the first cell measured by the terminal device falls within the second range. Furthermore, the second correspondence can be, for example, a correspondence set based on experience. For instance, simulation experiments may determine that when the first offset value of the adjustable unit is increased on the frequency point of the first cell, the signal quality of the first cell measured by the terminal device usually falls within the second range.

[0270] The third feasible approach is to reduce the second offset value of the adjustable unit on the frequency of the first cell.

[0271] The second offset value can be a preset value. For example, before the terminal device executes S601, the tuning module has an initial value at the frequency of the first cell, which could be a value that matches the impedance between the antenna and the RF circuit. After the terminal device reduces the second offset value, the adjustable unit becomes the difference between the initial value and the first offset value.

[0272] For example, it can be determined through simulation experiments or other means that, at the frequency point of the first cell, after the adjustable unit is reduced from the initial value to a second offset value, the signal quality of the first cell measured by the terminal device is usually poor, for example, satisfying the first or second item below.

[0273] Alternatively, the second offset value can be determined based on a third correspondence. The third correspondence includes the correspondence between the second offset value and a third range. This third correspondence can be preset in the terminal device. The third range can be understood as a range with poor signal quality; for example, when the signal quality of the first cell falls within the third range, the first cell is typically one of the cells with the worst signal quality in the target cell list.

[0274] Then, based on the third correspondence, the terminal device can reduce the second offset value of the adjustable unit on the frequency point of the first cell, thereby ensuring that the signal quality of the first cell measured by the terminal device falls within the third range. Furthermore, the third correspondence can be, for example, a correspondence set based on experience. For instance, simulation experiments might determine that when the second offset value of the adjustable unit is reduced on the frequency point of the first cell, the signal quality of the first cell measured by the terminal device typically falls within the third range.

[0275] The first, second, and third scopes can be the same or different.

[0276] It should be understood that in some scenarios, after the terminal device adjusts the adjustable unit in the above feasible ways, it may still reselect to the first cell, such as in S603 where the terminal device reselects to the first cell again. In this case, the terminal device can repeat the process from S601 to S603, meaning it can continue to adjust the adjustable unit on the frequency point of the first cell in any of the above methods until it reselects to a cell other than the first cell. Please refer to the description above; it will not be repeated here.

[0277] In this context, the first cell in the target cell list is not one of the top N cells with the best signal quality, where N is a positive integer.

[0278] If the first cell in the target cell list is not among the top N cells with the best signal quality, it can also be interpreted as the first cell's signal quality not being among the top N in the target cell list. This makes the probability of the terminal device reselecting the first cell relatively low.

[0279] Where N can be a preset positive integer, such as 1, 2, or 3. For example, N can be 3, in which case the signal quality of the first cell is not among the top 3 cells with the best signal quality in the target cell list.

[0280] It is understood that the method of adjusting the adjustable unit shown above is to make the first cell a cell with relatively poor signal quality in the target cell list. For example, by adjusting the adjustable unit, the signal quality of the first cell may meet any one or more of the following conditions, thereby making the probability of the terminal device reselecting to the first cell relatively small.

[0281] The first condition is that the first cell is not among the top N cells with the best signal quality in the target cell list.

[0282] Where N is a positive integer, such as 1, 2, or 3. For example, the signal quality may include RSRP, so the first cell in the target cell list is not among the top N cells with the highest RSRP.

[0283] The second item is that the first cell belongs to the X cells with the worst signal quality in the target cell list, where X is a positive integer.

[0284] Where X is a positive integer, for example, X can be 1 or 2, etc. For example, the signal quality can include RSRP, then the first cell in the target cell list belongs to the X cells with the smallest RSRP.

[0285] It should be understood that since terminal devices typically do not reselect to the X cells with the worst signal quality in the target cell list during cell reselection, in order for the terminal device to reselect to a cell other than the first cell, the first cell can be one of the X cells with the worst signal quality in the target cell list.

[0286] It should be noted that, based on method 400 described above, since the terminal device reselects to the first cell usually because the first cell has a high RSRP, in this embodiment, the terminal device can adjust the adjustable unit to reduce the measured RSRP of the first cell. This ensures that the first cell is not among the top N cells with the highest RSRP in the target cell list, thus reducing the probability of the terminal device reselecting to the first cell. Therefore, when co-channel interference exists in the first cell, the probability of the terminal device reselecting to the first cell is low.

[0287] In addition to the above feasible methods, alternatively, to ensure that the first cell in the target cell list is not among the top N cells with the best signal quality (e.g., RSRP), the terminal device can repeatedly adjust the adjustable unit until the first cell in the target cell list is no longer among the top N cells with the best signal quality. For example, after the terminal device adjusts the adjustable unit for the first time, if the first cell in the target cell list is among the top N cells with the best signal quality, the terminal device can adjust the adjustable unit again until the first cell in the target cell list is no longer among the top N cells with the best signal quality. This application does not impose specific limitations on this.

[0288] The following is a detailed description of the implementation method for determining the first cell as a problem cell in S601 by the terminal device.

[0289] The first possible implementation: The terminal device determines that the number of failed random accesses to the first cell is greater than or equal to the maximum number, and the SINR of the first cell is less than or equal to the threshold 3.

[0290] The threshold 3 can be a preset value. A SINR of less than or equal to threshold 3 indicates that interference in the first cell may be significant. Therefore, the terminal device can adjust the adjustable unit on the frequency point of the first cell when the SINR of the first cell is less than or equal to threshold 3.

[0291] In this way, when the interference in the first cell is large (such as when the same frequency interference is large), the adjustable unit can be adjusted on the frequency point of the first cell to reduce the measured signal quality (such as RSRP) of the first cell, so that the probability of the terminal device reselecting to the first cell is low.

[0292] The second possible implementation: The terminal device determines that the number of failures in random access to the first cell is greater than or equal to the maximum number, and the number of failures in the random access process caused by the retransmission of the first message (such as message B, message 4 or message 2, etc.) being greater than or equal to the maximum number of retransmissions is greater than or equal to the threshold 5.

[0293] Wherein, threshold 5 can be a positive integer, and threshold 5 can be less than or equal to the maximum number of times. Threshold 5 can be a preset value, a value configured by the network device, or a value predefined by the protocol. And when threshold 5 is equal to the maximum number of times, the above embodiment can also be replaced by: the terminal device determining that the number of failed attempts to randomly access the first cell is greater than or equal to the maximum number of times, and the failure of the random access process is caused by the number of retransmissions of the first message being greater than or equal to the maximum number of retransmissions.

[0294] When a terminal device accesses the first cell via a two-step random access procedure, the first message may include message B; when a terminal device accesses the first cell via a four-step random access procedure, the first message may include message 2 and / or message 4. During the random access process to the first cell, the terminal device may fail to receive the first message, causing the first cell to retransmit the first message multiple times. If the number of retransmissions of the first message is greater than or equal to the maximum number of retransmissions, the random access process to the first cell fails.

[0295] It should be understood that the process by which the terminal device determines that the random access to the first cell has failed is similar to the process by which the terminal device determines that the RACH process has failed in S403. Please refer to the description above, which will not be repeated here.

[0296] Since the terminal device may fail to receive the first message (such as message B, message 4 or message 2) from the network device due to co-channel interference in the first cell, this solution allows the terminal device to reduce the measured signal quality (such as RSRP) of the first cell by adjusting the adjustable unit on the frequency point of the first cell when co-channel interference exists, thereby making the probability of the terminal device reselecting to the first cell lower.

[0297] It should be noted that the two possible implementation methods described above can also be combined. For example, if the number of failed attempts for the terminal device to randomly access the first cell is greater than or equal to the maximum number, and the SINR of the first cell is determined to be less than or equal to threshold 3, and the number of failed random access attempts due to unsuccessful reception of messages from network devices (such as message B, message 4, or message 2, etc.) is greater than or equal to threshold 5, the terminal device adjusts the adjustable unit on the frequency point of the first cell. The implementation method of this scheme is similar to the two possible implementation methods described above, and can be referred to the description above; it will not be repeated here.

[0298] Optionally, after S601, S602, or S603, the terminal device can further adjust the adjustable unit on the frequency point of the first cell to match the impedance of the antenna and RF circuit on the frequency point of the first cell. For example, the terminal device can adjust the adjustable unit to its initial value, etc.

[0299] In this way, subsequent terminal devices can receive signals from the first cell when the impedance of the antenna and the radio frequency circuit are matched, without affecting the performance of subsequent terminal devices in receiving signals from the first cell.

[0300] Alternatively, after executing method 600, the terminal device may periodically adjust the adjustable unit at the frequency point of the first cell to match the impedance between the antenna and the radio frequency circuit at the frequency point of the first cell, and measure the signal-to-noise ratio (SNR) in the first cell. When the SNR in the first cell is lower than a certain threshold, the terminal device may maintain the state of the adjustable unit, that is, stop adjusting the adjustable unit at the frequency point of the first cell to match the impedance between the antenna and the radio frequency circuit at the frequency point of the first cell. Or, when the SNR in the first cell is greater than a certain threshold, the terminal device may adjust the adjustable unit again at the frequency point of the first cell to make the impedance between the antenna and the radio frequency circuit at the frequency point of the first cell mismatched.

[0301] Figure 7 This is a flowchart illustrating a cell measurement method 700 provided in an embodiment of this application. Method 700 is applicable to a communication system 100. Method 700 can be understood as a cell measurement method when a terminal device is in a connected state (accessing a first cell).

[0302] like Figure 7 As shown, method 700 includes the following steps:

[0303] It is understandable that before executing method 700, the terminal device can access the first cell via methods S501 to S503. That is, method 700 is the process executed when the terminal device is in a connected state and the serving cell is the first cell.

[0304] S701. When the terminal equipment accessing the first cell determines that the first cell is a problem cell, the terminal equipment adjusts the adjustable unit on the frequency point of the first cell so that the impedance between the antenna and the radio frequency circuit is mismatched on the frequency point of the first cell.

[0305] It should be understood that the way the terminal device in S701 adjusts the adjustable unit on the frequency point of the first cell is similar to the way the terminal device in S601 adjusts the adjustable unit on the frequency point of the first cell. Please refer to the description above, and it will not be repeated here.

[0306] The criteria for identifying the first cell as a problem cell include one or more of the following:

[0307] Item 1: The bit error rate (BER) of the downlink messages received by the terminal device is greater than or equal to the threshold of 6. Downlink messages include messages transmitted by the first cell through the physical downlink shared channel (PDSCH) and / or the physical downlink control channel (PDCCH).

[0308] Item 2: The number of times downlink messages are not successfully received within a duration of 1 is greater than or equal to the threshold of 7.

[0309] Item 3: The probability of failing to receive downlink messages within a duration of 2 is greater than or equal to the threshold 8.

[0310] Item 4: The SNR of the first cell is less than or equal to the threshold a.

[0311] Item 5: The SINR of the first cell is less than or equal to the threshold b.

[0312] Item 6: The absolute value of the difference between the RSRP of the first cell and the second cell is less than or equal to the threshold 9, and the difference between the RSRQ of the second cell and the RSRQ of the first cell is greater than or equal to the threshold 10. The second cell is one or more neighboring cells of the first cell.

[0313] Among them, thresholds 6, 7, 8, a, b, 9, or 10 can be preset values. Items 1 through 3 above indicate poor performance of the terminal device in demodulating downlink messages, suggesting potential interference issues in the first cell. Items 4 through 6 indicate potential co-channel interference in the first cell.

[0314] In other words, if one or more of the above conditions are met, it indicates that the first cell may have problems such as co-channel interference, and the terminal device can determine that the first cell is a problematic cell.

[0315] It should be noted that method 700 is a process executed by a terminal device in a connected state where the serving cell is the first cell. The network device decides whether the terminal device should perform a cell handover. This decision is based on the measurement report reported by the terminal device. Therefore, to enable the network device to decide whether the terminal device should perform a cell handover, the terminal device can adjust the adjustable unit on the frequency point of the first cell when it determines that the first cell is a problem cell. This reduces the signal quality of the first cell as measured by the terminal device, such as reducing the RSRP and SINR of the first cell. This helps the network device make a cell handover decision based on the measurement report.

[0316] Furthermore, since measurement reports are typically triggered under certain conditions, S701 can be executed after the terminal device triggers the measurement report reporting. For example, prior to S701, the terminal device may have already triggered the measurement report reporting. As in method 700, the method further includes: S704, where the terminal device sends a second measurement report to the first cell. The second measurement report includes the signal quality of the first cell and may also include the signal quality of some or all of the neighboring cells of the first cell. The first cell receives the second measurement report from the terminal device.

[0317] Furthermore, items 4 through 6 above can be determined based on a second measurement report, meaning the second measurement report may satisfy any one or more of items 4 through 6 above. The second measurement report can include the signal quality of one or more neighboring cells of the first cell, and may include the second cell. The second measurement report can be transmitted via a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH).

[0318] The terminal device can trigger the reporting of measurement reports through measurement events, such as A1, A2, A3, A4, A5, A6, B1, or B2 events. That is, after the terminal device triggers a measurement event, it can periodically report a measurement report to the first cell. The measurement report can include the signal quality of the first cell and some or all of its neighboring cells. The measurement report can be reported, for example, via PUSCH. This allows the network equipment to use the measurement report to decide whether to perform a cell handover.

[0319] S702. In the event of impedance mismatch between the antenna and the radio frequency circuit at the frequency point of the first cell, a cell measurement is performed to determine a first measurement report; and the first measurement report is sent to the first cell, the first measurement report including the signal quality of the first cell; or, the first measurement report including the signal quality of the first cell and some or all of the neighboring cells of the first cell. Correspondingly, the first cell receives the first measurement report from the terminal equipment.

[0320] The signal quality may include one or more of the following: RSRP, RSRQ, RSSI, SINR, or SNR. The first measurement report may, for example, be transmitted via PUSCH.

[0321] It should be understood that the signal quality of the first cell included in the second measurement report may have been measured under impedance matching conditions between the antenna and the RF circuit, while the signal quality of the first cell included in the first measurement report was measured under impedance mismatch conditions between the antenna and the RF circuit. Therefore, the signal quality of the first cell included in the first measurement report may be lower than the signal quality of the first cell included in the second measurement report.

[0322] For example, the RSRP of the first cell in the first measurement report is lower than that of the first cell in the second measurement report; the SINR of the first cell in the first measurement report is lower than that of the first cell in the second measurement report, etc.

[0323] Thus, since the signal quality of the serving cell (first cell) reported in the first measurement report is worse than that in the second measurement report, the terminal device is more likely to make a cell handover decision based on the first measurement report. Therefore, the first cell may execute S703.

[0324] It is understood that the content of the first measurement report may differ depending on the measurement event triggered by the terminal device. For example, when an A1 event is triggered, the first measurement report includes the signal quality of the first cell and some or all of its neighboring cells; when an A2 event is triggered, the first measurement report may include the signal quality of the first cell, etc. This application does not impose specific limitations on this.

[0325] S703, the network device sends message 5 to the terminal device, message 5 instructing the terminal device to switch to the target cell. Correspondingly, the terminal device receives message 5 from the first cell.

[0326] It should be understood that S703 is an optional step; that is, even if the signal quality of the first cell in the first measurement report meets the cell handover threshold, the network equipment decision terminal may not perform cell handover for other reasons. This application does not specifically limit this step.

[0327] The cell measurement method of this application, when the terminal device is in a connected state and accesses a first cell, if the terminal device determines that the first cell is a problem cell, can adjust an adjustable unit on the frequency point of the first cell to reduce the signal quality of the first cell as measured by the terminal device. This ensures that the signal quality of the first cell in the cell measurement report obtained by the terminal device meets the cell handover threshold, thereby increasing the probability that the network device will decide to hand over the terminal device. This helps the terminal device hand over from the problem cell to other cells, thereby optimizing the network condition of the terminal device and improving the user experience.

[0328] It is understood that the method of adjusting the adjustable unit shown above is to degrade the signal quality of the measured first cell (e.g., reduce RSRP) in order to meet the cell handover threshold. For example, by adjusting the adjustable unit, the signal quality of the first cell (first measurement report) may meet one or more of the following conditions, thereby helping the network equipment to decide whether the terminal equipment should perform a cell handover.

[0329] Item 7: The difference between the RSRP of the target cell and the RSRP of the first cell is greater than or equal to the threshold 1. The target cell is a neighboring cell of the first cell, and the target cell can be, for example, the cell with the highest RSRP and / or SINR among some or all of the neighboring cells of the first cell.

[0330] Item 8: The RSRP of the first cell is less than the threshold of 2.

[0331] Item 9: The difference between the SINR of the target cell and the SINR of the first cell is greater than or equal to the threshold 11.

[0332] Item 10: The SINR of the first cell is less than the threshold of 12.

[0333] Item 11: The difference between the RSRP of the first cell in the second measurement report and the RSRP of the first cell in the first measurement report is greater than or equal to the threshold 13.

[0334] Item 12: The RSRP of the first cell belongs to the fourth range.

[0335] Threshold 1 and threshold 2 can be referred to in the description above. Threshold 11 and threshold 12 may also be cell handover thresholds.

[0336] In this way, when the first measurement report meets one or more of the 7th to 10th conditions, the signal quality of the first cell in the first measurement report can meet the cell handover threshold, which helps the network equipment to make a decision to perform cell handover, allowing the terminal device to hand over from the problematic first cell to other cells, which helps to optimize the network condition of the terminal device and thus improve the user experience.

[0337] The threshold 13 and the fourth range can be values ​​determined empirically, for example, by adjusting the adjustable unit as shown in method 600, the RSRP of the first cell is usually reduced by a value greater than or equal to the threshold 13; or, by adjusting the adjustable unit as shown in method 600, the RSRP of the first cell is usually within the fourth range, etc.

[0338] Furthermore, if conditions 11 and / or 12 are met, it indicates that the signal of the first cell measured by the terminal device is poor, and the network device is more likely to decide that the terminal device should perform cell handover.

[0339] Furthermore, item 11 indicates that by adjusting the adjustable unit, the RSRP of the first cell measured by the terminal device is significantly reduced. This means that adjusting the adjustable unit helps the network device make decisions on cell handover based on the first measurement report.

[0340] Item 12 indicates that by adjusting the adjustable unit, the RSRP of the first cell measured by the terminal device falls within a lower range, namely the fourth range. This means that by adjusting the adjustable unit, the RSRP of the first cell is lower, thereby helping the network device to make decisions on cell handover based on the first measurement report.

[0341] It should be understood that, similar to method 600, items 7 through 12 shown above can be interpreted as the conditions that the measurement results (first measurement report) may satisfy when an impedance mismatch occurs between the antenna and the RF circuit at the frequency point of the first cell. That is, by adjusting the adjustable unit at the frequency point of the first cell to create an impedance mismatch between the antenna and the RF circuit, the terminal device can typically make the first measurement report satisfy one or more of items 7 through 12 shown above. This helps the network device make decisions regarding cell handover by the terminal device.

[0342] In addition to the above-described feasible methods, optionally, in order to ensure that the first measurement report satisfies one or more of items 7 to 12 shown above, the terminal device may repeatedly adjust the adjustable unit until the first measurement report satisfies one or more of items 7 to 12 shown above. Refer to the description in method 600; details will not be elaborated here.

[0343] It should be understood that in some scenarios, after the terminal device adjusts the adjustable unit in the feasible manner shown in method 600, the network device still decides not to perform cell handover, for example, after executing S701 and S702, the network device does not instruct the terminal device to perform cell handover. In this case, the terminal device can repeat S701 and S702, that is, the terminal device can continue to adjust the adjustable unit on the frequency point of the first cell in any feasible manner until the network device instructs the terminal device to perform cell reselection.

[0344] Optionally, after S701, S702, or S703, the terminal device can again adjust the adjustable unit on the frequency point of the first cell to match the impedance of the antenna and RF circuit on the frequency point of the first cell. For example, the terminal device can adjust the adjustable unit to its initial value, etc.

[0345] Alternatively, after executing method 700, the terminal device may periodically adjust the adjustable unit at the frequency point of the first cell to match the impedance between the antenna and the radio frequency circuit at the frequency point of the first cell, and measure the signal-to-noise ratio (SNR) within the first cell. When the SNR within the first cell is lower than a certain threshold, the terminal device may maintain the state of the adjustable unit, that is, stop adjusting the adjustable unit at the frequency point of the first cell to match the impedance between the antenna and the radio frequency circuit at the frequency point of the first cell; or, when the SNR within the first cell is greater than a certain threshold, the terminal device may adjust the adjustable unit again at the frequency point of the first cell to cause an impedance mismatch between the antenna and the radio frequency circuit at the frequency point of the first cell. This is similar to the implementation method in method 600.

[0346] In this way, subsequent terminal devices can receive signals from the first cell when the impedance of the antenna and the radio frequency circuit are matched, without affecting the performance of subsequent terminal devices in receiving signals from the first cell.

[0347] The following is combined with Figure 8 The implementation methods of adjusting the adjustable unit of the terminal device in methods 600 and 700 will be described in detail.

[0348] Figure 8 This is a schematic block diagram illustrating the hardware architecture of a terminal device provided in an embodiment of this application. Figure 8 As shown, the terminal device includes: an antenna 801, such as an antenna for receiving signals on the N1 band and an antenna for receiving signals on the N41 band; a tuning circuit 802; a radio frequency circuit 803; and a baseband circuit 804. The N1 and N41 bands can be understood as two frequency bands in 5G NR.

[0349] The tuning circuit 802 is connected to the antenna 801 and the radio frequency circuit 803. The radio frequency circuit 803 is connected to the baseband circuit 804.

[0350] Antenna 801 is used to receive signals from network devices (such as the first cell or neighboring cells of the first cell). It can convert the received electromagnetic waves into electrical signals, such as the received signal.

[0351] Tuning circuit 802 is used to acquire the received signal (signal from the network device) from antenna 801 and adjust the frequency response of the received signal to optimize reception performance. Through tuning, signals within a specific frequency range can be selectively received while suppressing other unwanted frequencies to obtain a tuned signal. For example, tuning circuit 802 can be used to selectively receive signals within a frequency range corresponding to the frequency point of the first cell, and can also adjust the adjustable unit while selectively receiving signals within this frequency range, thereby causing an impedance mismatch between antenna 801 and RF circuit 803 at the frequency point of the first cell.

[0352] It should be understood that for the frequency range corresponding to the frequency point of the first cell, the center frequency point of the frequency range can be the frequency point of the first cell, and the frequency range covers the channel bandwidth of the target channel, which can be the channel carrying the signal transmitted from the first cell to the terminal device. Furthermore, the tuning circuit 802 can also suppress interference from adjacent channels of the target channel.

[0353] The radio frequency (RF) circuit 803 is used to acquire the tuned signal, amplify it, and convert it from RF frequency to intermediate frequency (IF) or directly to baseband signal. RF circuits typically include components such as low-noise amplifiers (LNAs), mixers, and filters.

[0354] The baseband circuit 804, also known as a baseband module, can be understood as part or all of the baseband chip. It is used to acquire baseband signals and demodulate and digitize them. It can also determine key parameters of the signal, such as RSRP, SNR, RSRQ, SINR, RSSI, or one or more of the bit error rate.

[0355] It is understandable that in methods 600 and 700, the terminal device, by adjusting the adjustable unit at the frequency point of the first cell, can cause an impedance mismatch between the antenna 801 and the radio frequency circuit 803 at the frequency point of the first cell, thereby degrading the signal quality of the signal received by the terminal device from the first cell, and thus degrading the signal quality of the first cell measured by the terminal device. Furthermore, in methods 600 and 700, adjusting the adjustable unit can be a step performed by the tuning circuit 802.

[0356] Impedance matching refers to adjusting the input impedance (or load impedance) of antenna 801 and the output impedance (or source impedance) of RF circuit 803 to be equal or conjugate matched. Ideally, impedance matching between antenna 801 and RF circuit 803 maximizes power transmission and reduces reflection loss. However, after the terminal device adjusts the adjustable unit, the input impedance of antenna 801 and the output impedance of RF circuit 803 become unequal or mismatched, increasing the power of the reflected signal, leading to signal loss and decreased reception quality, thus degrading the performance of the received signal.

[0357] It should be noted that the adjustable unit can be understood as a component in the tuning circuit 802, a component in the radio frequency circuit 803, or a component in the antenna 801. Alternatively, the adjustable unit can be understood as a component integrated with one or more of the antenna 801, the tuning circuit 802, or the radio frequency circuit 803. Or, the adjustable unit can be a component or module of any other form.

[0358] Furthermore, when the impedance between antenna 801 and RF circuit 803 is matched, adjusting this adjustable unit can cause the impedance between antenna 801 and RF circuit 803 to become mismatched; conversely, when the impedance between antenna 801 and RF circuit 803 is mismatched, adjusting this adjustable unit can also cause the impedance between antenna 801 and RF circuit 803 to be matched. In other words, different states (or set values) of the adjustable unit will affect the impedance matching between antenna 801 and RF circuit 803.

[0359] The tuning circuit 802 can be understood as a module that can be used to adjust the adjustable unit, or as a control module or control circuit. For example, in method 600 or method 700, the adjustable unit can be adjusted from an initial value to a first value, etc.

[0360] Optionally, the adjustable unit can be a component of the tuning circuit 802. It is understood that the tuning circuit 802 is typically composed of components such as inductors, capacitors, and resistors. Therefore, the adjustable unit can include one or more of the inductors, capacitors, or resistors in the tuning circuit 802.

[0361] Optionally, the adjustable unit in the tuning circuit 802 is a capacitor in the tuning circuit 802. For example, in method 600 or method 700, the capacitor in the tuning circuit 802 can be adjusted to a first value, or the capacitor can be increased by a first offset value, or decreased by a second offset value, etc.

[0362] It should be understood that Figure 8 The architecture shown is merely an example. In some scenarios, the tuning circuit 802 can also be understood as a software module or a combination of software and hardware. That is, in this embodiment, the tuning circuit 802 can be replaced by a tuning module or a control module, etc., and can be understood as a module capable of adjusting the adjustable unit and causing an impedance mismatch between the antenna and the radio frequency circuit at the frequency point of the first cell. The tuning module can be hardware, software, or a combination of software and hardware. The tuning module is used to tune the impedance mismatch between the antenna and the radio frequency circuit at the frequency point of the first cell. This embodiment does not specifically limit the form of the tuning circuit 802.

[0363] It should also be understood that one or more of the antenna 801, tuning circuit 802, radio frequency circuit 803, and baseband circuit 804 can be set independently or integrated together. This application embodiment does not specifically limit this.

[0364] It should also be understood that the order of the methods listed above does not imply the order of execution. The execution order of each process should be determined by its function and internal logic.

[0365] It should be noted that methods 600 and 700 in the embodiments of this application can be implemented separately, or methods 600 and 700 can be implemented in combination. For example, the terminal device can execute method 600 in one time period and method 700 in another time period. This application does not impose specific limitations in this regard.

[0366] The above text combined Figures 6 to 8 The cell measurement method of the embodiments of this application is described in detail below, in conjunction with Figures 9 to 11 This application describes in detail the communication device according to embodiments of the present application. The communication device includes modules or units for performing each part of the above embodiments. The modules or units can be software, hardware, or a combination of software and hardware. The following only provides a brief example of a voice call device; for details of the implementation, please refer to the description of the foregoing method embodiments, which will not be repeated below.

[0367] Figure 9 This is a schematic block diagram illustrating the hardware architecture of a terminal device 900 provided in an embodiment of this application. Figure 9 As shown, the electronic device 900 may include a processor 910, an external memory interface 920, an internal memory 921, a universal serial bus (USB) interface 930, a charging management module 940, a power management module 941, a battery 942, an antenna 1, an antenna 2, a mobile communication module 950, a wireless communication module 960, an audio module 970, a sensor module 980, buttons 990, an indicator 992, a camera 993, and a display screen 994, etc.

[0368] The audio module 970 may include, but is not limited to, a speaker, a receiver, a microphone, and a headphone jack.

[0369] The sensor module 980 may include, but is not limited to, one or more of the following sensors: pressure sensor, gyroscope sensor, barometric pressure sensor, magnetic sensor, accelerometer, distance sensor, proximity sensor, fingerprint sensor, temperature sensor, touch sensor, ambient light sensor, and bone conduction sensor, etc.

[0370] It is understood that the structure illustrated in the embodiments of this application does not constitute a specific limitation on the terminal device 900. In other embodiments of this application, the terminal device 900 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0371] Processor 910 may include one or more processing units, such as: application processor (AP), modem processor, graphics processing unit (GPU), image signal processor (ISP), controller, video codec, digital signal processor (DSP), baseband processor, and / or neural network processing unit (NPU). Optionally, processor 910 may also include memory for storing instructions and data. The different processing units may be independent devices or integrated into one or more processors.

[0372] The wireless communication function of the terminal device 900, such as method 600 and / or method 700 mentioned above, can be implemented through antenna 1, antenna 2, mobile communication module 950, wireless communication module 960, modem processor, and baseband processor.

[0373] The terminal device 900 implements display functions through a GPU, a display screen 994, and an application processor. The GPU is a microprocessor for image processing, connecting the display screen 994 and the application processor. The GPU is used to perform mathematical and geometric calculations and for graphics rendering. The processor 910 may include one or more GPUs, which execute program instructions to generate or modify display information.

[0374] The display screen 994 is used to display images, videos, etc. In some embodiments, the terminal device 900 may include one or N display screens 994, where N is a positive integer greater than 1.

[0375] The external memory interface 920 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the terminal device 900. The internal memory 921 can be used to store computer executable program code, which includes instructions.

[0376] This application also provides a communication device, which includes a processing module and a transceiver module. The processing module can be used to execute some steps performed by the terminal device in method 600. Alternatively, the processing module can be used to execute some steps performed by the terminal device in method 700, such as S701; the transceiver module can be used to execute S501 to S503, S704, S702, and S703, etc.

[0377] It should be understood that the device described here is embodied in the form of a functional module. The term "module" here can refer to an application-specific integrated circuit (ASIC), electronic circuitry, a processor (e.g., a shared processor, a proprietary processor, or a group processor, etc.) and memory for executing one or more software or firmware programs, integrated logic circuitry, and / or other suitable components supporting the described functions. In an alternative example, those skilled in the art will understand that the device can specifically be the terminal device in the above embodiments, which can be used to execute the various processes and / or steps corresponding to the terminal device in the above method embodiments; to avoid repetition, these will not be described again here. Alternatively, the device can also be a chip, such as a SoC.

[0378] Figure 10 A schematic diagram of the structure of a communication device 1000 provided in an embodiment of this application is shown. The communication device 1000 includes a processor 1001, a transceiver 1002, and a memory 1003. The processor 1001, transceiver 1002, and memory 1003 communicate with each other via internal interconnection paths. The memory 1003 stores instructions, such as computer-defined code. The processor 1001 executes the instructions stored in the memory 1003 to control the transceiver 1002 to send and / or receive signals.

[0379] It should be understood that the communication device 1000 may specifically be the terminal device in the above embodiments, and may be used to execute the various steps and / or processes corresponding to the terminal device in the above method embodiments.

[0380] Optionally, memory 1003 may include read-only memory and random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information.

[0381] The processor 1001 can be used to execute instructions stored in memory, and when the processor 1001 executes instructions stored in memory, the processor 1001 is used to perform various steps and / or processes of the above method embodiments.

[0382] The transceiver 1002 may include a transmitter 10021, a receiver 10022, and an antenna 10023. The transmitter 10021 can be used to implement the various steps and / or processes corresponding to the transceiver for performing the transmission action. For example, the transmitter 10021 can be used to transmit information to another device through the antenna 10023. The receiver 10022 can be used to implement the various steps and / or processes corresponding to the transceiver for performing the reception action. For example, the receiver 10022 can be used to receive information from another device through the antenna 10023.

[0383] For example, Figure 8 The antenna 801 shown is similar to, for example, antenna 10023; the tuning circuit 802 and the radio frequency circuit 803 may be disposed in the receiver 10022; the baseband circuit 804 may be disposed in the processor 1001.

[0384] This allows the communication device 1000 to adjust the adjustable unit in the tuning circuit via the receiver 10022, enabling the communication device 1000 to implement method 600 or method 700.

[0385] Figure 11 A schematic diagram of another communication device 1100 provided in an embodiment of this application is shown. This communication device 1100 can be a chip system, or it can be an apparatus configured with a chip system to implement the methods described in the above method embodiments. In this embodiment, the chip system can be composed of chips, or it can include chips and other discrete devices.

[0386] like Figure 11 As shown, the communication device 1100 may include a processor 1110, which can be used to execute computer programs or instructions in memory to perform the various steps and / or processes corresponding to the terminal device in the above method embodiments.

[0387] In one possible implementation, the communication device 1100 further includes a communication interface 1120. The communication interface 1120 can be used to communicate with other devices via a transmission medium, thereby enabling the communication device 1100 to communicate with other devices. The communication interface 1120 may be, for example, a transceiver, an input / output interface, pins, a bus, a transceiver circuit, or a device capable of transmitting and receiving functions. The processor 1110 can utilize the communication interface 1120 to input and output data for executing the various steps and / or processes corresponding to the terminal device in the above method embodiments.

[0388] In one possible implementation, the communication device 1100 further includes at least one memory 1130 for storing program instructions and / or data. The memory 1130 is coupled to the processor 1110. The coupling in this embodiment is an indirect coupling or communication connection between devices, units, or modules, and can be electrical, mechanical, or other forms, used for information exchange between devices, units, or modules. The processor 1110 may operate in conjunction with the memory 1130. The processor 1110 may execute program instructions stored in the memory 1130.

[0389] Optionally, the memory 1130 may be a memory disposed in the device 1100. Exemplarily, the memory 1130 may be integrated with the processor 1110; or, the memory 1130 may be disposed separately from the processor 1110.

[0390] Optionally, memory 1130 may be memory outside of device 1100. It may also be memory outside of communication devices.

[0391] It should be understood that, in the embodiments of this application, the processor can be a central processing unit (CPU), a microprocessor unit (MPU), a microcontroller unit (MCU), a graphics processing unit (GPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0392] In implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware processor, or as a combination of hardware and software modules within the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor executes the instructions in the memory, combining them with its hardware to complete the steps of the above method. To avoid repetition, detailed descriptions are omitted here.

[0393] Some embodiments of this application provide a chip system applied to a terminal. The chip system includes at least one processor and an interface. The interface is used to receive instructions and transmit them to the at least one processor. The at least one processor executes instructions to cause the terminal to perform the aforementioned cell reselection method. The chip system may be, for example, a modem chip, also known as a baseband chip, or a system-on-chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip.

[0394] A modem may include a NAS (non-access stratum) layer, an RRC (radio resource control) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer. Each of these layers can be a software module. The modem interacts with the base station via an antenna.

[0395] This application also provides a computer-readable storage medium for storing a computer program for implementing the methods shown in the above-described method embodiments.

[0396] This application also provides a computer program product, which includes a computer program (also referred to as code or instructions) that, when run on a computer, allows the computer to perform the methods shown in the above-described method embodiments.

[0397] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope provided by the embodiments of this application.

[0398] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and modules described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0399] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0400] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0401] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0402] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions provided in this application, or the parts that contribute to the prior art, or parts of the technical solutions, can be embodied in the form of software products. These computer software products are stored in a storage medium and include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0403] The above description is merely a specific implementation method provided in this application, but the protection scope of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the protection scope of this application. Therefore, the protection scope of this application should be determined by the scope of the claims.

Claims

1. A method for measuring a cell block, characterized in that, Applied to a terminal device, the terminal device including an antenna and radio frequency circuitry, the method includes: In the case that the first cell is a problem cell, the input impedance of the antenna and the output impedance of the radio frequency circuit are adjusted to a mismatched state at the frequency point of the first cell, where the first cell is a serving cell or a camping cell. Obtain the signal quality of the first cell; Cell reselection is performed based on the signal quality of the first cell; or, a first measurement report is sent, the first measurement report including the signal quality of the first cell.

2. The method according to claim 1, characterized in that, The terminal device further includes an adjustable unit, which includes one or more of the following: a capacitor, an inductor, or a resistor; Adjusting the input impedance of the antenna to a mismatched state with the output impedance of the radio frequency circuit at the frequency point of the first cell includes: adjusting the adjustable unit at the frequency point of the first cell to adjust the input impedance of the antenna to a mismatched state with the output impedance of the radio frequency circuit.

3. The method according to claim 2, characterized in that, Adjusting the adjustable unit on the frequency of the first cell includes any one of the following: On the frequency of the first cell, the adjustable unit is adjusted to a first value; At the frequency point of the first cell, the adjustable unit is increased by the first offset value; or, At the frequency point of the first cell, the adjustable unit is adjusted to a smaller second offset value.

4. The method according to any one of claims 1 to 3, characterized in that, The first cell is a stationary cell, and the terminal device is in an idle state; The first cell is a problematic cell, including: the number of times the terminal device fails to access the first cell randomly is greater than or equal to the maximum number of times.

5. The method according to claim 4, characterized in that, The method further includes: Based on the fact that the number of retransmissions of the first message is greater than or equal to the first threshold, it is determined that the random access to the first cell has failed. The first message is the message sent by the first cell during the random access process.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: Obtain the signal quality of at least one neighboring cell of the first cell; The cell reselection based on the signal quality of the first cell includes: Cell reselection is performed based on the signal quality of each cell in the target cell list, which includes the first cell and some or all of the cells in the at least one neighboring cell.

7. The method according to any one of claims 1 to 3, characterized in that, The first cell is the serving cell, and the terminal device is in a connected state; Before adjusting the input impedance of the antenna and the output impedance of the radio frequency circuit to a mismatched state at the frequency point of the first cell, the method further includes: Send a second measurement report, which includes the signal quality of the first cell.

8. The method according to claim 7, characterized in that, In the second measurement report, the signal quality of the first cell includes the signal-to-noise ratio (SNR) and / or the signal-to-interference-plus-noise ratio (SINR) of the first cell; The first cell is a problem cell, including: in the second measurement report, the SNR of the first cell is less than or equal to a second threshold; and / or, the SINR of the first cell is less than or equal to a third threshold; or, The signal quality of the first cell in the second measurement report includes the Reference Received Power (RSRP) and Reference Received Quality (RSRQ) of the first cell. The second measurement report also includes the RSRP and RSRQ of one or more neighboring cells of the first cell. If the first cell is a problem cell, it includes: in the second measurement report, the absolute value of the difference between the RSRP of the first cell and the RSRP of the second cell is less than or equal to a fourth threshold, and the difference between the RSRQ of the second cell and the RSRQ of the first cell is greater than or equal to a fifth threshold. The second cell is one of the one or more neighboring cells.

9. The method according to claim 7 or 8, characterized in that, The signal quality of the first cell in the first measurement report includes the RSRP of the first cell, and the signal quality of the first cell in the second measurement report also includes the RSRP of the first cell. The RSRP of the first cell in the first measurement report is less than the RSRP of the first cell in the second measurement report.

10. The method according to any one of claims 1 to 9, characterized in that, The first cell is a problematic cell, including any one or more of the following: The bit error rate of received downlink messages is greater than or equal to the sixth threshold; The number of times downlink messages are not successfully received within the first time period is greater than or equal to the seventh threshold; or, The probability of failing to receive downlink messages within the second time period is greater than or equal to the eighth threshold.

11. The method according to any one of claims 1 to 10, characterized in that, After obtaining the signal quality of the first cell, the method further includes: At the frequency of the first cell, the input impedance of the antenna is adjusted to match the output impedance of the radio frequency circuit.

12. The method according to any one of claims 1 to 11, characterized in that, The terminal device further includes a tuning circuit, which includes an adjustable unit. At the frequency point of the first cell, adjusting the input impedance of the antenna and the output impedance of the radio frequency circuit to a mismatched state includes: The tuning circuit adjusts the adjustable unit at the frequency of the first cell so that the input impedance of the antenna is mismatched with the output impedance of the radio frequency circuit.

13. The method according to any one of claims 1 to 12, characterized in that, The first cell is the serving cell, and the terminal device is in a connected state; After sending the first measurement report, the method further includes: The system receives a second message from the first cell, the second message indicating a handover to a target cell. The first measurement report also includes the signal quality of the target cell, which is a neighboring cell of the first cell.

14. A terminal device, characterized in that, include: The terminal device includes an antenna, a radio frequency unit, a tuning unit, and a processing unit, and is connected to or resides in the first cell. The tuning unit is used to adjust the input impedance of the antenna and the output impedance of the radio frequency unit to a mismatched state at the frequency point of the first cell when the first cell is a problematic cell. The antenna is used to receive a first signal from the first cell; The tuning unit is used to perform tuning processing on the first signal to obtain a tuned signal. The tuned signal includes signals within the target frequency range of the first signal. The target frequency range is the frequency range corresponding to the frequency point of the first cell. The radio frequency unit is used to amplify the tuned signal and convert the amplified tuned signal into an intermediate frequency signal or a baseband signal. The processing unit is used to determine the signal quality of the first cell based on the intermediate frequency signal or the baseband signal.

15. The terminal device according to claim 14, characterized in that, The tuning unit includes an adjustable unit, which includes one or more of a capacitor, an inductor, or a resistor. Adjusting the input impedance of the antenna to a mismatched state with the output impedance of the radio frequency unit includes any one of the following: On the frequency of the first cell, the adjustable unit is adjusted to a first value; At the frequency point of the first cell, the adjustable unit is increased by the first offset value; or, At the frequency point of the first cell, the adjustable unit is adjusted to a smaller second offset value.

16. A terminal device, characterized in that, include: A processor coupled to a memory for storing a computer program, wherein when the processor invokes the computer program, the terminal device performs the method as described in any one of claims 1 to 13.

17. A chip, characterized in that, It includes at least one processor and a communication interface, the communication interface and the at least one processor being interconnected via a line, the at least one processor being configured to run a computer program or instructions to perform the method as described in any one of claims 1 to 13.

18. A computer-readable storage medium, characterized in that, Used to store a computer program, the computer program including instructions for implementing the method as described in any one of claims 1 to 13.

19. A computer program product, characterized in that, The computer program product includes computer program code that, when run on a computer, causes the computer to implement the method as described in any one of claims 1 to 13.

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