Wireless link detection method, device and communication system

Abstract

The present application provides a wireless link detection method, device and communication system, wherein the wireless link detection device is arranged in a terminal device, and the device comprises a detection unit: when a first timer related to wireless link monitoring times out, the detection unit determines that a wireless link using an unlicensed frequency band has failed; or, when a high layer of the terminal device receives a random access problem indication and a second timer related to reconstruction is not running, the detection unit determines that a wireless link using an unlicensed frequency band has failed. The present application can detect the failure of a wireless link using an unlicensed frequency band.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a wireless link detection method, device and communication system. Background Art

[0002] In an existing wireless communication system, when a specific trigger condition is met, it will be determined as a Radio Link Failure (RLF).

[0003] The specific trigger condition may be related to a Radio Link Monitoring (RLM) process. For example, the terminal device may monitor a specific signal sent by a network device and determine whether the radio link fails based on the monitoring result.

[0004] The specific trigger condition may also be related to the random access process. For example, it may be determined whether the radio link fails based on an indication of a random access problem.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0006] The inventors of the present application have discovered that the prior art determines whether a wireless link using a licensed frequency band has failed so that the terminal can restore the connection or let the network know of the failure; however, when communicating using an unlicensed frequency band, the terminal also needs to restore the connection or let the network know of the wireless link failure. Therefore, it is necessary to perform wireless link failure detection for the wireless link using the unlicensed frequency band.

[0007] The embodiments of the present application provide a wireless link detection method, device and communication system, which determine the failure of a wireless link using an unlicensed frequency band according to a first timer related to wireless link monitoring, or according to a random access problem indication received by a high layer of a terminal device and a second timer related to reestablishment. Thus, the failure of a wireless link using an unlicensed frequency band can be detected.

[0008] According to a first aspect of an embodiment of the present application, a wireless link detection device is provided, which is arranged in a terminal device, and the device includes a detection unit: when a first timer related to wireless link monitoring times out, the detection unit determines that the wireless link using an unlicensed frequency band has failed; or, when a high layer of the terminal device receives an indication of a random access problem and a second timer related to reconstruction is not running, the detection unit determines that the wireless link using the unlicensed frequency band has failed.

[0009] According to the second aspect of an embodiment of the present application, a wireless link detection device is provided, which is arranged in a network device, and the device includes a configuration and sending unit, which configures the terminal device to: adjust the parameters used for wireless link failure detection and / or the process of wireless link failure detection according to the parameters of the channel load; or sends parameters for indicating the sending status of synchronization signal blocks and / or reference signals to the terminal device, so that the terminal device adjusts the parameters used for wireless link failure detection and / or the process of wireless link failure detection.

[0010] According to the third aspect of an embodiment of the present application, a communication system is provided, which includes a terminal device and a network device, the terminal device includes the wireless link detection device as described in the first aspect of the above embodiment, and the network device includes the wireless link detection device as described in the second aspect of the above embodiment.

[0011] The beneficial effect of the embodiments of the present application is that it is possible to detect failure of a wireless link using an unlicensed frequency band.

[0012] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the terms of the appended claims, the embodiments of the present application include many changes, modifications and equivalents.

[0013] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0014] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The elements and features described in one figure or one implementation of the present application embodiment may be combined with the elements and features shown in one or more other figures or implementations. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures and can be used to indicate corresponding parts used in more than one implementation.

[0016] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0017] Figure 1 is a schematic diagram of the communication system of the present application;

[0018] Figure 2 is a schematic diagram of a wireless link detection method according to Embodiment 1 of the present application;

[0019] Figure 3 is a schematic diagram of a wireless link detection method according to Embodiment 2 of the present application;

[0020] Figure 4 is a schematic diagram of a wireless link detection device according to Embodiment 3 of the present application;

[0021] Figure 5 is a schematic diagram of a wireless link detection device according to Embodiment 4 of the present application;

[0022] Figure 6 This is a schematic diagram of the network device configuration of Example 5 of the present application;

[0023] Figure 7 This is a schematic diagram of the structure of the terminal device of Example 6 of the present application. DETAILED DESCRIPTION

[0024] The foregoing and other features of the present application will become apparent through the following description with reference to the accompanying drawings. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims. Various embodiments of the present application are described below in conjunction with the accompanying drawings. These embodiments are exemplary only and are not limitations of the present application.

[0025] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements in terms of title, but do not indicate the spatial arrangement or temporal order of these elements, etc., and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.

[0026] In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a kind" or "a type" rather than being limited to the meaning of "one"; in addition, the term "the" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least in part according to...", and the term "based on" should be understood as "at least in part based on...", unless the context clearly indicates otherwise.

[0027] In an embodiment of the present application, the term "communication network" or "wireless communication network" may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), High-Speed ​​Packet Access (HSPA, High-Speed ​​Packet Access), etc.

[0028] Furthermore, communication between devices in the communication system may be carried out according to communication protocols of any stage, for example, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and future 5G, new wireless (NR, New Radio), etc., and / or other communication protocols currently known or to be developed in the future.

[0029] In the embodiments of the present application, the term "network device" refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device. The network device may include, but is not limited to, the following devices: a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), and the like.

[0030] Among them, base stations may include but are not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB) and 5G base station (gNB), etc., and may also include remote radio heads (RRH, Remote Radio Head), remote radio units (RRU, Remote Radio Unit), relays or low-power nodes (such as femto, pico, etc.). And the term "base station" may include some or all of their functions, and each base station may provide communication coverage for a specific geographical area. The term "cell" may refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0031] In the embodiments of the present application, the term "user equipment" (UE) or "terminal equipment" (TE) refers to, for example, a device that accesses a communication network through a network device and receives network services. The terminal equipment may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and the like.

[0032] Among them, the terminal device may include but is not limited to the following devices: cellular phone, personal digital assistant (PDA, Personal Digital Assistant), wireless modem, wireless communication device, handheld device, machine type communication device, laptop computer, cordless phone, smart phone, smart watch, digital camera, etc.

[0033] For another example, in scenarios such as the Internet of Things (IoT), the terminal device can also be a machine or device for monitoring or measuring, such as but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device to device (D2D) terminal, machine to machine (M2M) terminal, and so on.

[0034] The following describes the scenarios of the embodiments of the present application through examples, but the present application is not limited thereto.

[0035] Figure 1 is a schematic diagram of the communication system of the present application, schematically illustrating a situation taking a terminal device and a network device as an example, such as Figure 1As shown, the communication system 100 may include a network device 101 and a terminal device 102 (for simplicity, Figure 1 Only one terminal device is used as an example for explanation).

[0036] In the embodiment of the present application, existing services or services that can be implemented in the future can be carried out between the network device 101 and the terminal device 102. For example, these services include but are not limited to: enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.

[0037] The terminal device 102 may send data to the network device 101, for example, using an authorized or unauthorized transmission mode. The terminal device 101 may receive data sent by one or more terminal devices 102, and feedback information to the terminal device 102, such as confirmation ACK / non-confirmation NACK information, etc. The terminal device 102 may confirm the end of the transmission process, or may perform new data transmission, or may retransmit the data according to the feedback information.

[0038] In addition, before the terminal device 102 accesses the network device 101 , the network device 101 may send information related to the system information to the terminal device 102 , and the terminal device 102 detects the received information to achieve downlink synchronization and establish a connection with the network device 101 .

[0039] The following description is made by taking the network device in the communication system as the transmitting end and the terminal device as the receiving end as an example, but the present application is not limited thereto, and the transmitting end and / or the receiving end may also be other devices. For example, the present application is not only applicable to signal transmission between a network device and a terminal device, but also applicable to signal transmission between two terminal devices.

[0040] Example 1

[0041] Embodiment 1 of the present application provides a wireless link detection method, which can be executed by a terminal device.

[0042] Figure 2 FIG. 1 is a schematic diagram of the wireless link detection method of this embodiment. Figure 2 As shown, the method includes:

[0043] Step 201: When the first timer associated with wireless link monitoring times out, the terminal device determines that the wireless link using the unlicensed frequency band has failed; or, when the higher layer of the terminal device receives an indication of a random access problem and the second timer associated with reconstruction is not running, the terminal device determines that the wireless link using the unlicensed frequency band has failed.

[0044] According to this embodiment, wireless link failure detection can be performed on a wireless link using an unlicensed frequency band.

[0045] In step 201 of this embodiment, the terminal device may determine that the wireless link using the unlicensed frequency band fails under two conditions: the first condition is that a first timer associated with wireless link monitoring times out, and the second condition is that a higher layer of the terminal device receives a random access problem indication and a second timer associated with reestablishment is not running.

[0046] In this embodiment, the process of the terminal device detecting the failure of the wireless link using the unlicensed frequency band according to the first condition may be, for example:

[0047] When the radio resource control (RRC) layer of the terminal device receives a certain number (such as consecutive N310, i.e., the number of out-of-sync indications) of out-of-sync indications from a special cell (the special cell is, for example, a primary cell (PCell) or a primary secondary cell (PSCell)) indicated by the lower layer, a timer (such as a first timer T310) is started. When the first timer times out (i.e., the running time of the first timer exceeds the duration serving as a threshold), the RRC determines that the radio link has failed.

[0048] In addition, during the operation of the first timer T310, if the RRC layer receives a certain number (such as consecutive N311, ie, the number of synchronization indications) of synchronization (In Sync) indications of the special cell, the first timer may be stopped.

[0049] In this embodiment, the synchronization indication and the out-of-sync indication are the results of physical layer radio link monitoring. When the radio link quality of all configured radio link monitoring (RLM) resources of a special cell is lower than the threshold Q out When the quality of the radio link on any configured RLM resource of a special cell is lower than the threshold Q in When the quality of the wireless link is good, the physical layer reports a synchronization indication to the higher layer within the frame for wireless link quality assessment.

[0050] With respect to the process of detecting failure of a wireless link using an unlicensed frequency band according to the first condition, the inventors of the present application have discovered that, when detecting failure of a wireless link using an unlicensed frequency band, special mechanisms associated with the unlicensed frequency band may affect the detection of wireless link failure. For example, when using an unlicensed frequency band to provide services to a terminal device, both the network device and the terminal device need to listen before communicating, i.e., Listen Before Talk (LBT), to determine whether the channel is idle. Only when the channel is idle can the network device send synchronization blocks, reference signals, downlink control information, downlink data, etc. Therefore, a busy channel in the unlicensed frequency band may interfere with the detection of wireless link failure. Similarly, a busy channel in the unlicensed frequency band may also affect the terminal device during the detection and processing of wireless link failure.

[0051] In this embodiment, the process of the terminal device detecting the failure of the wireless link using the unlicensed frequency band according to the second condition may be, for example:

[0052] When the upper layer of the terminal device does not receive a random access response, or the contention resolution is unsuccessful, the count value of the counter PREAMBLE_TRANSMISSION_COUNTER is increased by 1, and when the value of the counter PREAMBLE_TRANSMISSION_COUNTER is preambleTransMax+1, the random access problem is indicated to the upper layer; and when the upper layer receives an indication of a random access problem and the re-establishment-related second timer (e.g., T311) is not running, the terminal device determines that the wireless link using the unlicensed frequency band has failed.

[0053] Among them, the upper layer of the terminal device did not receive a random access response, for example, did not receive a correct random access response (RAR) within the window length of the window related to the random access response; the contention resolution was unsuccessful, for example, the running time of the third timer related to the random access contention resolution exceeded the preset duration; preambleTransMax is used to control the transmission number threshold of the random access preamble code for sending a random access problem indication to the upper layer of the terminal device.

[0054] With respect to the process of detecting the failure of a wireless link using an unlicensed frequency band according to the second condition, the inventors of the present application have also discovered that, when detecting the failure of a wireless link using an unlicensed frequency band, special mechanisms associated with the unlicensed frequency band may affect the detection of wireless link failure. For example, when using an unlicensed frequency band to provide services to a terminal device, both the network device and the terminal device need to listen before communicating, i.e., Listen Before Talk (LBT), to determine whether the channel is idle. Only when the channel is idle can the network device send a random access response or a message 4 for contention resolution. Therefore, a busy channel in the unlicensed frequency band may interfere with the detection of wireless link failure. Similarly, a busy channel in the unlicensed frequency band may also affect the terminal device during the detection and processing of wireless link failure.

[0055] In this embodiment, if Figure 2 As shown, the method may also include:

[0056] Step 202: Adjust the parameters for wireless link failure detection and / or the process for wireless link failure detection based on the channel load parameters measured by the terminal device or the parameters for sending synchronization signal blocks and / or reference signals provided by the network device.

[0057] In this embodiment, when the detection parameters and / or the detection process are adjusted in step 202, in step 201, the terminal device can determine that the wireless link using the unlicensed frequency band has failed based on the adjusted detection parameters and / or the adjusted detection process.

[0058] In step 202 of this embodiment, the channel load parameter refers to a parameter describing the channel usage status, wherein the channel load parameter includes at least one of the following parameters: channel busy ratio (CBR), channel occupancy ratio (CR), and listen before talk (LBT) success rate.

[0059] In this embodiment, the channel busy rate refers to the ratio of the time during which the scheduled channel is used in the first scheduled time period to the first scheduled time period. For example, the channel blind rate can be obtained by measuring a certain measurement quantity of the resources in the configured transmission pool, and the ratio of the resources with a result higher than the corresponding threshold to the total configured resources, where the measurement quantity can be, for example, the received signal strength indication (RSSI). The channel busy rate can be a parameter used for machine communication and / or vehicular communication in Long Term Evolution (LTE), or a new parameter introduced for unlicensed bands in New Radio (NR).

[0060] In this embodiment, the channel occupancy rate refers to the ratio of the number of resources transmitted or authorized in the scheduled channel to the total number of resources configured in the transmission pool in the second predetermined time period (for example, the time of 1000 subframes before and after the current subframe). The channel occupancy rate can be a parameter used for unlicensed frequency bands in LTE, or a new parameter introduced for unlicensed frequency bands in NR.

[0061] In this embodiment, the Listen Before Talk (LBT) success rate refers to the ratio of the number of successful Listen Before Talk attempts within the third predetermined time period to the total number of Listen Before Talk attempts within the third predetermined time period.

[0062] In step 202 of this embodiment, when the network device is capable of transmission, the parameter provided by the network device for indicating the transmission status of the synchronization signal block and / or the reference signal includes at least one of the following parameters:

[0063] (1) Information about the synchronization signal blocks actually sent between the network device and the terminal device, such as the period, duration, and offset within the window of the synchronization signal block;

[0064] (2) the offset of the reference signal and / or synchronization signal block (SSB) actually transmitted, for example, in the case of supporting RMTC, discovery signal measurement timing configuration (DMTC), or transmission outside the SMTC window, the offset of the reference signal and / or SSB actually transmitted compared to the previously configured RMTC, DMTC, or SMTC;

[0065] (3) the number or times of transmission failures due to LBT within a fourth predetermined time period, where the fourth predetermined time period may be, for example, a time period from the last notification to the current moment;

[0066] (4) Channel load parameters sent by the network device. The definition of the channel load parameters is the same as described above. For example, they may include at least one of the channel busy ratio (CBR), the channel occupancy ratio (CR) and the listen before talk (LBT) success rate. In addition, the channel load parameters may be measured by other terminal devices, sent to the network device, and then sent to the terminal device by the network device; or the channel load parameters may be obtained by the network device itself, for example, through measurement by the network device, and then sent to the terminal device by the network device.

[0067] In step 202 of this embodiment, the adjusted parameters for detecting the radio link failure may be parameters used in the above-mentioned process of detecting the radio link failure according to the first condition, for example, including at least one of the following parameters: the duration of the first timer (T310), the number of out-of-sync indications (N310) that starts the first timer (T310), the number of synchronization indications (N311) that stops the first timer (T310), and the duration of the fourth timer (T312) used to detect fast radio link failure (fastRLF).

[0068] In this embodiment, the parameters used in the above-mentioned process of detecting wireless link failure according to the first condition are adjusted. Therefore, even when the network detects that the channel is busy, the wireless link failure can be accurately detected; and as long as the measurement result reaches the reporting indication, the physical layer always reports the out-of-sync indication, and the change to the physical layer is small.

[0069] The following is an example of how to adjust the duration of T310, N310, N311, and T312 based on the channel load parameters, for example:

[0070] In the first implementation, the number of out-of-sync indications is adjusted to N310 / (1-channel busy rate), that is, when consecutive N310 / (1-channel busy rate) out-of-sync indications are received, the first timer T310 is started;

[0071] In the second implementation, the duration of the timer T310 is adjusted to the configuration value / (1-channel busy rate);

[0072] In a third embodiment, if fast radio link failure (fast RLF) is supported, the duration of timer T312 is adjusted to a configuration value / (1-channel busy rate), wherein T310 is running and T312 is started when the measurement report of the corresponding measurement object is triggered, and once T312 times out, a connection reestablishment process is immediately initiated;

[0073] In the fourth embodiment, the number of synchronization indications is adjusted to N311*(1-channel busy rate), that is, when N311*(1-channel busy rate) consecutive out-of-sync indications are received, the timer T310 is stopped.

[0074] In the above example, if N310 / (1-channel busy rate), configuration value / (1-channel busy rate) or N311*(1-channel busy rate) and other adjusted parameter values ​​are not integers after adjustment, they are rounded.

[0075] In the above example, the parameter of channel load takes channel busy rate as an example, but is not limited to this. For example, it can also be channel occupancy rate or LBT success rate. If the channel occupancy rate or LBT success rate is used for adjustment, the method is opposite, that is, multiplication * is used instead of the above division / , and division / is used instead of the above multiplication *, and the channel occupancy rate or LBT success rate is used instead of the above (1-channel busy rate).

[0076] In the above examples, the step of adjusting the parameters can be mandatory or optional, for example, it can be configured by the network device or determined by the terminal device itself. Configuration by the network device includes: the network device directly configures its application; or the network device configures the application conditions, and the terminal applies it after determining that the conditions are met; or the network device performs implicit configuration, etc.

[0077] In this embodiment, the network device may directly configure the use of at least one of high-layer signaling, MAC CE, and physical layer control signaling; the method for configuring the application conditions of the network device may be, for example, indicating a threshold of a certain measurement quantity (such as RSRP / RSRQ / SINR / channel occupancy ratio, etc.) to the terminal, and when the measurement result is higher or lower than the threshold, the method is applied to adjust the parameters; the network device may be implicitly configured, for example, the network device may configure the terminal device to use an unlicensed frequency band, thereby implicitly configuring the terminal device to adjust the parameters for the wireless link failure detection according to the parameters of the channel load.

[0078] In the above example, a method for adjusting parameters based on channel load is described. The method for adjusting parameters provided by the network device for indicating the transmission status of the synchronization signal block and / or reference signal can refer to the above example.

[0079] In step 202 of this embodiment, the parameters for detecting the failure of the wireless link that are adjusted may also be the parameters used in the process of detecting the failure of the wireless link according to the second condition, for example, including at least one of the following parameters: a threshold value preambleTransMax for controlling the number of transmissions of the random access preamble code for sending a random access problem indication to the upper layer of the terminal device, a window length of a window related to a random access response, and a duration of a third timer related to random access contention resolution. The specific adjustment method of the above parameters may refer to the above examples.

[0080] In this embodiment, by adjusting the parameters used in the process of detecting radio link failure according to the second condition, the accuracy of detecting radio link failure in the random access process can be improved.

[0081] In step 202 of this embodiment, the process of radio link failure detection may also be adjusted. The adjusted process of radio link failure detection may include at least one of the following steps:

[0082] (1) when the number of out-of-sync indications reaches the number of out-of-sync indications (N310) used to start the first timer (T310), the first timer (T310) is not started, but continues to count until it reaches a first indication number (N313), and then the first timer (T310) is started, wherein the value of the first indication number (N313) is determined according to the parameter for the transmission of the synchronization signal block and / or the reference signal provided by the network device;

[0083] (2) when the first timer (T310) is not running, suspending the out-of-sync indication counter, using a first counter different from the out-of-sync indication counter, and when the count value of the first counter reaches the first indication number (N313), the out-of-sync indication counter resumes counting, wherein the value of the first indication number (N313) is determined according to the parameter for the transmission of the synchronization signal block and / or the reference signal provided by the network device;

[0084] (3) When the number of transmissions of the random access preamble reaches one more than the threshold, the medium access control (MAC) sublayer of the terminal device does not report the random access problem to the higher layer, but continues to count the number of transmissions of the random access preamble until the count reaches a first number N1, and then reports the random access problem to the higher layer, where the value of the first number N1 is determined according to the parameter for the transmission of the synchronization signal block and / or the reference signal provided by the network device;

[0085] (4) Suspending the counter of the number of transmissions of the random access preamble code, using a second counter different from the counter of the number of transmissions of the random access preamble code, when the second counter reaches a second number (N2), the counter of the number of transmissions of the random access preamble code resumes counting, and the value of the second number is determined according to the parameters provided by the network device for the transmission of the synchronization signal block and / or the reference signal.

[0086] Among them, the counter involved in the above process can be implemented by a hardware counter or by a software program.

[0087] In this embodiment, by adjusting the process of radio link failure detection, the accuracy of detecting radio link failure triggered by physical layer problems can be improved, and / or the accuracy of detecting radio link failure in a random access process can be improved.

[0088] In this embodiment, if Figure 2As shown, in this method, step 202 may be replaced by step 202a.

[0089] In step 202a, the triggering condition for the physical layer of the terminal device to report the out-of-sync indication to the higher layer can be adjusted, so that the physical layer of the terminal device can report the out-of-sync indication to the higher layer based on the adjusted triggering condition, and the higher layer determines the failure of the wireless link using the unlicensed frequency band based on the received out-of-sync indication and the parameters for wireless link failure detection. Thus, the behavior of the physical layer can be changed without changing the protocol and implementation of the higher layer.

[0090] In one embodiment, the triggering condition for the physical layer of the terminal device to report the out-of-sync indication to the higher layer can be adjusted as follows: the physical layer determines whether to report the out-of-sync indication to the higher layer of the terminal device according to the relationship between the measurement quantity and each threshold in the threshold combination, wherein the threshold combination may have at least 2 thresholds. For example, for the same measurement quantity, such as PDCCHBLER, RSRP / RSRQ / SINR / REEI of SSB, or RSRP / RSRQ / SINR / RSSI of CSI-RS, 2 thresholds can be used, and when the measurement result is higher or lower than the first threshold, and lower or higher than the second threshold, the out-of-sync indication is reported to the higher layer.

[0091] In another embodiment, the triggering condition for the physical layer of the terminal device to report the out-of-sync indication to the higher layer can be adjusted as follows: according to the relationship between the parameter of the channel load and the threshold, determine whether to report the out-of-sync indication to the higher layer of the terminal device, wherein the parameter of the channel load can be at least one of the channel busy rate, the channel occupancy rate and the listen before conversation (LBT) success rate. For the description of the parameters of the channel load, reference can be made to the above description. In this embodiment, for example, when the quality of the synchronization signal block and / or the reference signal is higher or lower than the threshold 1, and the channel busy rate is lower than the threshold 2, the out-of-sync indication is reported to the higher layer; for another example, when the quality of the synchronization signal block and / or the reference signal is higher or lower than the threshold 1, and the channel occupancy rate or the LBT success rate is higher than the threshold 3, the out-of-sync indication is reported to the higher layer.

[0092] In addition, step 202a may not replace step 202, thereby performing both adjustment of parameters and / or processes and adjustment of trigger conditions.

[0093] The inventor of the present application further discovered that when a wireless link failure using an unlicensed frequency band is determined, if the current mechanism (such as cell selection, cell reselection or failure reporting, etc.) is used for processing, the wireless link failure may also occur in the newly established cell using the unlicensed frequency band due to the processing specific to the unlicensed frequency band, such as LBT, etc. Therefore, it is considered to adjust the current mechanism.

[0094] Next, the processing when a wireless link failure using an unlicensed frequency band is detected will be described.

[0095] In this embodiment, if Figure 2 As shown, the method also includes:

[0096] Step 203: When it is determined that the radio link failure on the unlicensed frequency band occurs in the primary cell group, the terminal device performs cell selection or cell reselection.

[0097] In this embodiment, if the terminal device is not configured with dual connectivity (Dual Connectivity, DC), or the terminal device is configured with DC and the radio link failure occurs in the main cell group (MCG), it can be considered that the radio link failure occurs in the main cell group. In this case, the terminal device can remain in the connected state, select a suitable cell and reestablish the connection, that is, cell selection or cell reselection after cell selection. If a suitable cell is not found within a certain period of time after determining that the radio link has failed, the UE enters the idle state.

[0098] In step 203, when the terminal device performs cell selection, at least one of the following methods may be used:

[0099] (1) In the cell selection criteria, such as criterion S, the unlicensed frequency band uses a first threshold, and the first threshold is the same as or different from the second threshold used in the licensed frequency band. For example, the network device provides a specific minimum value for the unlicensed frequency band through system information (such as SIB1). The specific minimum value is an example of the first threshold. The specific minimum value can be, for example, Qrxlevmin and / or Qqualmin, where Qrxlevmin is the minimum value of the reception level, that is, the minimum reception value of RSRP, and Qqualmin is the minimum value of the reception quality, that is, the minimum value of RSRQ.

[0100] (2) The cell selection criterion (e.g., criterion S) is adjusted by an offset value related to the channel load, where the channel load is, for example, a channel load determined by a network device. For example, the network device provides the offset value Qoffset via system information (e.g., SIB1). load , based on the offset value, the criterion S can be adjusted as follows:

[0101] Srxlev=Qrxlevmeas-(Qrxlevmin+Qrxlevoffset)-Pcompensation-Qoffset temp -Qoffse tload

[0102] Squal=Qqualmeas-(Qqualmin+Qqualoffset)-Qoffset temp -Qoffset load

[0103] (3) In the cell selection criteria (e.g., criteria S), a measurement quantity related to the channel load is used. The channel load is, for example, a channel load determined by a network device. The measurement quantity related to the channel load can be represented as Sload. Based on the measurement quantity Sload, the criteria S can be, for example: Srxlev>0, Squal>0, and Sload<0.

[0104] In one embodiment, the measurement value Sload can be obtained by the following formula:

[0105] Sload=Qloadmeas-(Qloadmax+Qloadmaxoffset)-Qoffset temp1

[0106] Qloadmeas can be the proportion of the measured values ​​of a cell whose RSSI value is higher than the threshold; Qload can be the configured maximum value; Qloadmaxoffset and Qoffset temp1 There can be two adjustment values: Qloadmeas, Qloadmax, Qloadmaxoffset and Qoffset temp1 All are ratios and have no units.

[0107] (4) In the cell selection criteria, the threshold and / or offset value of the measurement quantity related to the channel load determined by the network equipment is used.

[0108] In step 203, when the terminal device performs cell reselection, at least one of the following methods may be used:

[0109] (1) The terminal device sets the priority of the unlicensed frequency band to be lower than that of the licensed frequency band;

[0110] (2) The cell reselection criterion is adjusted by an offset value related to a channel load, which may be determined by a network device. The cell reselection criterion may be, for example, an R criterion for ranking cells of the same frequency and different frequency cells with the same priority. For example, the offset value related to the channel load may be represented as Qoffset load , the neighbor sorting criterion Rn of the R criterion is adjusted to Rn = Q meas，n -Qoffset-Qoffset load ;

[0111] (3) In the cell reselection criterion (e.g., R criterion), a measurement quantity related to the channel load determined by the network device is used. For the description of the use of the measurement quantity in the R criterion, reference may be made to the description in (3) above when the terminal device performs cell selection.

[0112] (4) In the cell reselection criteria, the threshold and / or offset value of the measurement quantity related to the channel load determined by the network device is used.

[0113] In this embodiment, if Figure 2 As shown, the method may also include:

[0114] Step 204: When a wireless link failure occurs, the terminal device sends a channel load parameter to the network device, where the channel load parameter includes at least one of a channel busy rate, a channel occupancy rate, and an LBT success rate.

[0115] The channel load parameter may include: the last load measurement result of the previous serving cell, and / or the load measurement results of the listed cells.

[0116] The previous serving cell refers to a cell where a radio link failure occurs or a primary cell, and the load measurement result may be a load-related measurement result at the cell level and / or a load-related measurement result at the SSB / CSI-RS level.

[0117] The specific parameters of the channel load parameters may be at least one of the channel busy rate, the channel occupancy rate, and the LBT success rate. For the description of the channel load parameters, please refer to the description of the channel load parameters in the above step 202.

[0118] In one implementation of step 204 of this embodiment, when a radio link failure using an unlicensed frequency band occurs, after reestablishing the connection through cell selection or cell reselection, if the terminal device has the channel load parameters of the previously failed cell, then the terminal device can report the channel load parameters of the previously failed cell to the network side. The channel load parameters can be sent through at least one of the following messages: a radio resource control (RRC) connection reconfiguration complete message, a radio resource control (RRC) connection reconstruction complete message, a radio resource control (RRC) connection reply complete message, a radio resource control (RRC) connection establishment complete message, a measurement report message, and a terminal device information response message.

[0119] In another implementation of step 204 of this embodiment, when a wireless link failure using an unlicensed frequency band occurs, if the terminal does not need to reestablish the connection, the terminal device may send a failure report to the network device to report the wireless link failure. The situation where the terminal does not need to reestablish the connection may be, for example: the terminal device is configured with DC and the wireless link failure occurs in the secondary cell group; the terminal device performs duplication transmission, and a link failure occurs in one of the cells performing duplication transmission.

[0120] In this implementation, if the terminal device has the channel load parameters of the failed cell, the failure report may include the channel load parameters of the failed cell. The failure report may be carried in a secondary cell group (SCG) information report message and sent.

[0121] In this embodiment, step 203, step 204, and step 201 can be combined to detect and process wireless link failure. Since step 202 can be omitted, there is no impact on the physical layer protocol and implementation, and the impact on the high-level protocol and implementation is small, which can save development costs. In addition, when performing cell selection and cell reselection, selection can be made based on the parameters of the signal load, so that the selected cell is more suitable. In addition, the terminal device provides the network device with the parameters of the channel load, which can help the network device collect information, thereby facilitating the adjustment of the mobility parameters, so as to better serve the terminal device.

[0122] In this embodiment, step 203, step 204, step 201 and step 202 may also be combined to detect and process wireless link failure, thereby improving the accuracy of wireless link failure detection and selecting a more suitable cell when wireless link failure is detected.

[0123] Example 2

[0124] This embodiment 2 provides a wireless link detection method, which is executed by a network device.

[0125] Figure 3 is a schematic diagram of a wireless link detection method according to Embodiment 2 of the present application. Figure 3 As shown, the method includes:

[0126] Step 301: The network device configures the terminal device to adjust the parameters used for wireless link failure detection and / or the process of wireless link failure detection according to the parameters of the channel load, or the network device sends parameters for indicating the sending status of the synchronization signal block and / or the reference signal to the terminal device, so that the terminal device adjusts the parameters used for wireless link failure detection and / or the process of wireless link failure detection.

[0127] In step 301 of this embodiment, the channel load parameter refers to a parameter describing the channel usage status, and includes at least one of the following parameters: channel busy rate, channel occupancy rate, and listen before talk (LBT) success rate.

[0128] In this embodiment, the channel busy rate refers to the ratio of the time that the reserved channel is used in the first predetermined time period to the first predetermined time period; the channel occupancy rate refers to the ratio of the number of resources transmitted or authorized in the reserved channel in the second predetermined time period to the total number of resources configured in the transmission pool; the listen-before-talk (LBT) success rate refers to the ratio of the number of successful listen-before-talk in the third predetermined time period to the total number of listen-before-talk in the third predetermined time period.

[0129] In step 301 of the present implementation, the parameters sent by the network device to the terminal device for indicating the sending status of the synchronization signal block and / or the reference signal include at least one of the following parameters: information on the synchronization signal block actually sent between the network device and the terminal device, the offset of the reference signal and / or synchronization signal block (SSB) actually sent, the number or number of times that transmission cannot be made due to LBT within a fourth predetermined time period, and the channel load parameters sent by the network device.

[0130] For description of parameters for radio link failure detection and / or the process of radio link failure detection, reference may be made to Example 1.

[0131] In this embodiment, if Figure 3 As shown, the method also includes:

[0132] Step 302: The network device receives the channel load parameters sent by the terminal device, where the channel load parameters include at least one of a channel busy rate, a channel occupancy rate, and an LBT success rate.

[0133] In step 302, the channel load parameter is sent via at least one of the following messages:

[0134] Radio resource control (RRC) connection reconfiguration completion message, radio resource control (RRC) connection reconstruction completion message, radio resource control (RRC) connection reply completion message, radio resource control (RRC) connection establishment completion message, measurement report message, terminal equipment information response message, secondary cell group (SCG) information report message.

[0135] In this embodiment, if Figure 3 As shown, the method also includes:

[0136] Step 303: The network device configures cell selection related parameters and / or cell reselection related parameters for the terminal device.

[0137] In one embodiment, the network device configures the cell selection-related parameters for the terminal device as at least one of the following: a first threshold for use of an unlicensed frequency band in the cell selection criteria, the first threshold being the same as or different from a second threshold for use of an authorized frequency band; an offset value related to the channel load of the cell selection criteria determined by the network device; a measurement quantity related to the channel load of the cell selection criteria determined by the network device; and a threshold and / or offset value of a measurement quantity related to the channel load in the cell selection criteria determined by the network device.

[0138] In another embodiment, the network device configures the cell reselection-related parameters for the terminal device as at least one of the following: the priority of the authorized frequency band is higher than the priority of the unlicensed frequency band; the offset value related to the channel load of the criteria for cell reselection determined by the network device; the measurement quantity related to the channel load of the criteria for cell reselection determined by the network device; the threshold and / or offset value of the measurement quantity related to the channel load in the criteria for cell reselection determined by the network device.

[0139] In this embodiment, through step 303, when a wireless link failure occurs and the terminal device needs to reselect a cell, the terminal device can perform cell selection or cell reselection according to the parameters configured in step 303.

[0140] In the method of this embodiment, only step 301 may be included, thereby improving the accuracy of the terminal device in detecting the failure of the wireless link. In the method of this embodiment, only step 302 or step 303 may be included, thereby helping the network device to collect information or facilitating the terminal device to select a more suitable cell when a wireless link failure occurs. In the method of this embodiment, any two or three of step 301, step 302 and step 303 may also be included, thereby combining the advantages of each step.

[0141] Example 3

[0142] This embodiment 3 provides a wireless link detection device, which is arranged in a terminal device. Since the principle of solving the problem by the device is similar to the method of embodiment 1, its specific implementation can refer to the implementation of the method of embodiment 1, and the same contents will not be repeated.

[0143] Figure 4 FIG. 1 is a schematic diagram of a wireless link detection device according to Embodiment 3. Figure 4 As shown, the device 400 includes: a detection unit 401.

[0144] In this embodiment, when a first timer associated with wireless link monitoring times out, the detection unit 401 determines that the wireless link using the unlicensed frequency band has failed; or, when a higher layer of the terminal device receives an indication of a random access problem and a second timer associated with reconstruction is not running, the detection unit 401 determines that the wireless link using the unlicensed frequency band has failed.

[0145] In this embodiment, if Figure 4 As shown, the apparatus 400 may also include: a first adjustment unit 402. The first adjustment unit 402 adjusts the parameters for radio link failure detection and / or the process of radio link failure detection according to the channel load parameters measured by the terminal device, or according to the parameters for the transmission of synchronization signal blocks and / or reference signals provided by the network device. Thus, the detection unit 401 determines the failure of the radio link using the unlicensed frequency band according to the adjusted parameters and / or the process.

[0146] In this embodiment, if Figure 4 As shown, the apparatus 400 may further include: a first receiving unit 403. The first receiving unit 403 receives the configuration of the network device, wherein the first adjusting unit 402 adjusts the parameters for the wireless link failure detection based on the configuration of the network device.

[0147] In this embodiment, if Figure 4 As shown, the apparatus 400 may also include: a second adjustment unit 404, which is used to control the physical layer of the terminal device to determine whether to report the out-of-sync indication to the high layer of the terminal device according to the relationship between the measurement amount and each threshold in the threshold combination, or according to the relationship between the parameter of the channel load and the threshold. Wherein, the threshold combination has at least 2 thresholds, and the detection unit 401 determines the failure of the wireless link using the unlicensed frequency band based on the received out-of-sync indication and the parameters for wireless link failure detection.

[0148] In this embodiment, if Figure 4 As shown, the apparatus 400 may further include: a selection unit 405. When the radio link failure occurs in the primary cell group, the selection unit 404 performs cell selection or cell reselection.

[0149] In this embodiment, the description of each unit can refer to the description of each step in Embodiment 1.

[0150] According to this embodiment, wireless link failure in an unlicensed frequency band can be detected; in addition, the accuracy of wireless link failure detection can be improved; in addition, a more suitable cell can be selected when wireless link failure is detected.

[0151] Example 4

[0152] This embodiment 4 provides a wireless link detection device, which is arranged in a network device. Since the principle of solving the problem by the device is similar to the method of embodiment 2, its specific implementation can refer to the implementation of the method of embodiment 2, and the same contents will not be repeated.

[0153] Figure 5 FIG. 4 is a schematic diagram of a wireless link detection device according to Embodiment 4. Figure 5 As shown, the apparatus 500 includes: a configuration and sending unit 501. The configuration and sending unit 501 configures the terminal device to adjust the parameters for the radio link failure detection and / or the process of the radio link failure detection according to the parameters of the channel load; or sends parameters for indicating the transmission status of the synchronization signal block and / or the reference signal to the terminal device, so that the terminal device adjusts the parameters for the radio link failure detection and / or the process of the radio link failure detection.

[0154] like Figure 5 As shown, the apparatus 500 may further include: a second receiving unit 502. When a wireless link failure occurs, the second receiving unit 502 receives a channel load parameter sent by the terminal device, wherein the channel load parameter includes at least one of a channel busy rate, a channel occupancy rate, and an LBT success rate.

[0155] like Figure 5 As shown, the apparatus 500 may further include: a second configuration unit 503 or a third configuration unit 504. The second configuration unit 503 configures the cell selection related parameters for the terminal device, and the third configuration unit 504 configures the cell reselection related parameters for the terminal device.

[0156] In this embodiment, the description of each unit can refer to the description of each step in Embodiment 2.

[0157] According to this embodiment, the accuracy of the terminal device in detecting wireless link failure can be improved; when a wireless link failure occurs, it can help the network device collect information or facilitate the terminal device to select a more suitable cell.

[0158] Example 5

[0159] This embodiment 5 provides a network device, the principle of solving the problem of the device is similar to the method of embodiment 2, so its specific implementation can refer to the method of embodiment 2, and the same content will not be repeated.

[0160] Figure 6 Schematic diagram of the network device structure of the embodiment of the present invention. Figure 6As shown, the network device 600 may include: a central processing unit (CPU) 601 and a memory 602; the memory 602 is coupled to the CPU 601. The memory 602 may store various data; in addition, it may store a data processing program, and execute the program under the control of the CPU 601.

[0161] In one implementation, the functions of the apparatus 500 may be integrated into a central processor 601. The central processor 601 may be configured to implement the wireless link detection method of the second embodiment.

[0162] For example, the central processor 601 may be configured to perform control so that the network device 600 executes the method of the second embodiment.

[0163] In addition, other configurations of the central processor 601 may refer to Example 2 and will not be described in detail here.

[0164] In another embodiment, the apparatus 500 may be configured separately from the central processor 601. For example, the apparatus 500 may be configured as a chip connected to the central processor 601. Figure 6 The units shown implement the functions of the device 500 through the control of the central processor 601.

[0165] In addition, if Figure 6 As shown, the network device 600 may also include: a transceiver 603 and an antenna 604, etc.; wherein the functions of the above components are similar to those of the prior art and are not described in detail here. It is worth noting that the network device 600 does not necessarily have to include Figure 6 In addition, the network device 600 may also include Figure 6 For components not shown, reference may be made to the prior art.

[0166] According to this embodiment, the accuracy of the terminal device in detecting wireless link failure can be improved; when a wireless link failure occurs, it can help the network device collect information or facilitate the terminal device to select a more suitable cell.

[0167] Example 6

[0168] This embodiment 6 provides a terminal device. Since the principle of solving the problem by the device is similar to the method of embodiment 1, its specific implementation can refer to the method of embodiment 1, and the same contents will not be repeated.

[0169] Figure 7 Schematic diagram of the terminal device in the embodiment of the present application. Figure 7As shown, the terminal device 700 may include: a central processing unit (CPU) 701 and a memory 702; the memory 702 is coupled to the central processing unit 701. The memory 702 may store various data; in addition, it may store a data processing program, and execute the program under the control of the central processing unit 701 to instruct the terminal device according to the received signaling.

[0170] In one implementation, the function of the apparatus 400 of embodiment 3 may be integrated into the central processor 701 of the terminal device 700. The central processor 701 may be configured to implement the wireless link detection method described in embodiment 1.

[0171] For example, the central processor 701 may be configured to perform control so that the terminal device 700 executes the method of embodiment 1.

[0172] In addition, other configurations of the central processor 701 may refer to Example 1 and will not be described in detail here.

[0173] In another embodiment, the apparatus 400 may be configured separately from the CPU 701. For example, the apparatus 400 may be configured as a chip connected to the CPU 701. Figure 7 The units shown implement the functions of the device 400 through the control of the central processor 701.

[0174] According to this embodiment, wireless link failure in an unlicensed frequency band can be detected; in addition, the accuracy of wireless link failure detection can be improved; in addition, a more suitable cell can be selected when wireless link failure is detected.

[0175] Example 7

[0176] This embodiment 7 provides a communication system, which at least includes the network device 600 in embodiment 5 and the terminal device 700 in embodiment 6. The contents of embodiment 5 and embodiment 6 are combined here and will not be repeated here.

[0177] An embodiment of the present invention further provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a wireless link detection apparatus or a terminal device to execute the wireless link detection method described in Embodiment 1.

[0178] An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in a wireless link detection apparatus or a terminal device, the program enables the wireless link detection apparatus or the terminal device to execute the wireless link detection method of embodiment 1.

[0179] An embodiment of the present invention further provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a wireless link detection apparatus or a network device to execute the wireless link detection method of embodiment 2.

[0180] An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in a wireless link detection device or a network device, the program enables the wireless link detection device or the network device to execute the wireless link detection method described in Example 2.

[0181] The above devices and methods of the present invention can be implemented by hardware, or by hardware combined with software. The present invention relates to such a computer-readable program, which, when executed by a logic component, enables the logic component to implement the above-mentioned devices or components, or enables the logic component to implement the above-mentioned various methods or steps. The present invention also relates to a storage medium for storing the above-mentioned program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0182] Each processing method in each device described in conjunction with the embodiments of the present invention may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. Figure 4 , 5 , 10, 11, 15 and / or one or more combinations of the functional block diagrams may correspond to various software modules of the computer program flow or to various hardware modules. These software modules may correspond to Figure 2 , 3 , 8, 9, and 14. These hardware modules can be implemented by solidifying these software modules using, for example, a field programmable gate array (FPGA).

[0183] The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in a memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (e.g., a mobile terminal) uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0184] against Figure 4 , 5One or more of the functional block diagrams and / or one or more combinations of the functional block diagrams described herein may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any appropriate combination thereof for performing the functions described in the present application. Figure 4 , 5 One or more of the described functional block diagrams and / or one or more combinations of the functional block diagrams may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0185] The present invention has been described above in conjunction with specific embodiments, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make various modifications and variations to the present invention based on the principles of the present invention, and these modifications and variations are also within the scope of the present invention.

[0186] This application also provides the following notes:

[0187] 1. A wireless link detection device, arranged in a terminal device, comprising a detection unit:

[0188] When a first timer related to wireless link monitoring times out, the detection unit determines that the wireless link using the unlicensed frequency band fails; or,

[0189] When a higher layer of the terminal device receives a random access problem indication and a second timer related to the reestablishment is not running, the detection unit determines that the wireless link using the unlicensed frequency band has failed.

[0190] 2. The device as described in Note 1, wherein the device further comprises:

[0191] a first adjustment unit, which adjusts parameters for radio link failure detection and / or a process for radio link failure detection according to parameters of the channel load measured by the terminal device, or according to parameters for transmission of synchronization signal blocks and / or reference signals provided by the network device,

[0192] The detection unit determines, based on the adjusted parameters and / or the process, that a wireless link using the unlicensed frequency band has failed.

[0193] 3. The device as described in Note 2, wherein:

[0194] The adjusted parameters for detecting radio link failure include at least one of the following parameters:

[0195] the duration of the first timer (T310), the number of out-of-sync indications (N310) that starts the first timer (T310), the number of in-sync indications (N311) that stops the first timer (T310), and the duration of a fourth timer (T312) for detecting a fast radio link failure (fast RLF);

[0196] Alternatively, the adjusted parameters for detecting radio link failure include at least one of the following parameters:

[0197] Used to control the threshold of the number of transmissions of the random access preamble code for sending a random access problem indication to the upper layer of the terminal device, the window length of the window related to the random access response, and the duration of the third timer related to the random access contention resolution.

[0198] 4. The apparatus as described in Note 2, wherein the adjusted wireless link failure detection process comprises at least one of the following steps:

[0199] When the number of out-of-sync indications reaches the number of out-of-sync indications (N310) used to start the first timer (T310), the first timer (T310) is not started, but continues to count until a first indication number (N313) is reached, and the first timer (T310) is started, wherein the value of the first indication number (N313) is determined according to the parameter provided by the network device for the transmission of the synchronization signal block and / or the reference signal;

[0200] When the first timer (T310) is not running, suspending the out-of-step indication counter, using a first counter different from the out-of-step indication counter, and when the count value of the first counter reaches the first indication quantity (N313), the out-of-step indication counter resumes counting, wherein the value of the first indication quantity (N313) is determined according to the parameter for the transmission of the synchronization signal block and / or the reference signal provided by the network device;

[0201] When the number of transmissions of the random access preamble reaches one more than the threshold, the medium access control (MAC) sublayer of the terminal device does not report the random access problem to the higher layer, but continues to count the number of transmissions of the random access preamble until the count reaches a first number (N1), and then reports the random access problem to the higher layer, wherein the value of the first number is determined according to the parameter for the transmission of the synchronization signal block and / or the reference signal provided by the network device;

[0202] Suspend the counter of the number of transmission times of the random access preamble code, use a second counter different from the counter for calculating the number of transmission times of the random access preamble code, when the second counter reaches a second number (N2), the counter of the number of transmission times of the random access preamble code resumes counting, and the value of the second number is determined according to the parameters provided by the network device for the sending of the synchronization signal block and / or the reference signal.

[0203] 5. The device as described in Note 2, wherein:

[0204] The channel load parameter refers to a parameter describing the channel usage status.

[0205] 6. The device as described in Note 5, wherein:

[0206] The channel load parameter includes at least one of the following parameters:

[0207] Channel busy rate, channel occupancy rate and Listen Before Talk (LBT) success rate.

[0208] 7. The device as described in Appendix 6, wherein:

[0209] The channel busy rate refers to the ratio of the time in which the scheduled channel is used in the first scheduled time period to the first scheduled time period.

[0210] 8. The device as described in Supplementary Note 6, wherein:

[0211] The channel occupancy rate refers to the ratio of the number of resources transmitted or authorized in the reserved channel in the second predetermined time period to the total number of resources configured in the transmission pool.

[0212] 9. The device as described in Appendix 6, wherein:

[0213] The LBT success rate refers to the ratio of the number of successful LBT attempts within the third predetermined time period to the total number of LBT attempts within the third predetermined time period.

[0214] 10. The device as described in Note 2-10, wherein the device further comprises:

[0215] A first receiving unit receives a configuration of a network device,

[0216] The first adjustment unit adjusts the parameters for detecting the wireless link failure based on the configuration of the network device.

[0217] 11. The device as described in Note 2, wherein:

[0218] The parameter provided by the network device for indicating the transmission status of the synchronization signal block and / or the reference signal includes at least one of the following parameters:

[0219] The information of the synchronization signal blocks actually sent between the network device and the terminal device, the offset of the reference signal and / or synchronization signal block (SSB) actually sent, the number or number of times that transmission cannot be made due to LBT within a fourth predetermined time period, and the parameters of the channel load sent by the network device.

[0220] 12. The device as described in any one of Notes 1 to 11, wherein the device further comprises:

[0221] A selection unit, when the radio link failure occurs in a primary cell group, the selection unit performs cell selection or cell reselection.

[0222] 13. The device as described in Note 12, wherein:

[0223] When the selection unit performs cell selection:

[0224] In the cell selection criteria, the unlicensed frequency band uses a first threshold, and the first threshold is the same as or different from a second threshold used in the licensed frequency band; or

[0225] The cell selection criterion is adjusted by an offset value related to the channel load determined by the network device; or,

[0226] using, in the cell selection criteria, a measurement quantity related to the channel load determined by the network device; or

[0227] In the cell selection criterion, a threshold value and / or an offset value of a measurement quantity related to the channel load determined by the network device is used.

[0228] 14. The device as described in Note 12, wherein:

[0229] When the selection unit performs cell reselection:

[0230] The terminal device sets the priority of the unlicensed frequency band to be lower than the priority of the licensed frequency band; or

[0231] The cell reselection criterion is adjusted by an offset value related to the channel load determined by the network device; or,

[0232] using, in a cell reselection criterion, a measurement quantity related to a channel load determined by the network device;

[0233] In the cell reselection criterion, a threshold value and / or an offset value of a measurement quantity related to the channel load determined by the network device is used.

[0234] 15. The device as described in any one of Notes 1 to 12, wherein the device further comprises:

[0235] The first sending unit sends a channel load parameter to the network device when a wireless link failure occurs. The channel load parameter includes at least one of a channel busy rate, a channel occupancy rate, and an LBT success rate.

[0236] 16. The device as described in Note 15, wherein the parameter of the channel load is sent via at least one of the following messages:

[0237] Radio resource control (RRC) connection reconfiguration completion message, radio resource control (RRC) connection reconstruction completion message, radio resource control (RRC) connection reply completion message, radio resource control (RRC) connection establishment completion message, measurement report message, terminal equipment information response message, secondary cell group (SCG) information report message.

[0238] 17. The device as described in Note 1, wherein:

[0239] A second adjustment unit is used to control the physical layer of the terminal device to determine whether to report the out-of-sync indication to the higher layer of the terminal device according to the relationship between the measurement amount and each threshold in the threshold combination, or according to the relationship between the parameter of the channel load and the threshold,

[0240] Wherein, the threshold combination has at least 2 thresholds,

[0241] The detection unit determines, based on the received out-of-synchronization indication and according to a parameter for radio link failure detection, that a radio link using the unlicensed frequency band has failed.

[0242] 18. A wireless link detection device, arranged in a network device, comprising a configuration and sending unit, wherein:

[0243] Configuring the terminal device to adjust the parameters for radio link failure detection and / or the process of radio link failure detection according to the channel load parameters; or

[0244] Parameters for indicating the transmission status of the synchronization signal block and / or the reference signal are sent to the terminal device so that the terminal device adjusts the parameters for the wireless link failure detection and / or the wireless link failure detection process.

[0245] 19. The device as described in Note 18, wherein:

[0246] The channel load parameter refers to a parameter describing the channel usage status.

[0247] 20. The device as described in Note 19, wherein:

[0248] The channel load parameter includes at least one of the following parameters:

[0249] Channel busy rate, channel occupancy rate and Listen Before Talk (LBT) success rate.

[0250] 21. The device as described in Note 20, wherein:

[0251] The channel busy rate refers to the ratio of the time in which the scheduled channel is used in the first scheduled time period to the first scheduled time period.

[0252] 22. The device as described in Note 20, wherein:

[0253] The channel occupancy rate refers to the ratio of the number of resources transmitted or authorized in the reserved channel in the second predetermined time period to the total number of resources configured in the transmission pool.

[0254] 23. The device as described in Note 20, wherein:

[0255] The LBT success rate refers to the ratio of the number of successful LBT attempts within the third predetermined time period to the total number of LBT attempts within the third predetermined time period.

[0256] 24. The device as described in Note 18, wherein:

[0257] The parameter sent by the network device to the terminal device for indicating the transmission status of the synchronization signal block and / or the reference signal includes at least one of the following parameters:

[0258] The information of the synchronization signal blocks actually sent between the network device and the terminal setting, the offset of the reference signal and / or synchronization signal block (SSB) actually sent, the number or number of times that transmission cannot be made due to LBT within a fourth predetermined time period, and the parameters of the channel load sent by the network device.

[0259] 25. The device as described in any one of Notes 18 to 24, wherein the device further comprises:

[0260] A second receiving unit receives a parameter of a channel load sent by a terminal device, wherein the parameter of the channel load includes at least one of a channel busy rate, a channel occupancy rate, and an LBT success rate.

[0261] 26. The device as described in Note 25, wherein the parameter of the channel load is sent via at least one of the following messages:

[0262] Radio resource control (RRC) connection reconfiguration completion message, radio resource control (RRC) connection reconstruction completion message, radio resource control (RRC) connection reply completion message, radio resource control (RRC) connection establishment completion message, measurement report message, terminal equipment information response message, secondary cell group (SCG) information report message.

[0263] 27. The device as described in any one of Notes 18 to 26, wherein the device further comprises:

[0264] The second configuration unit configures one of the following parameters for the terminal device:

[0265] In the cell selection criteria, a first threshold for use of an unlicensed frequency band, the first threshold being the same as or different from a second threshold for use of a licensed frequency band; or

[0266] an offset value related to the channel load of the criterion used for cell selection determined by the network device; or,

[0267] a measurement related to channel load used as a criterion for cell selection determined by the network equipment; or

[0268] The network device determines a threshold value and / or an offset value of a measurement quantity related to channel load in a cell selection criterion.

[0269] 28. The device as described in any one of Notes 18 to 26, wherein the device further comprises:

[0270] A third configuration unit is configured to configure the parameters used by the terminal device for cell reselection as follows:

[0271] The priority of licensed frequency bands is higher than the priority of unlicensed frequency bands; or

[0272] an offset value related to the channel load of the criterion for cell reselection determined by the network device; or,

[0273] A measurement related to channel load used as a criterion for cell reselection determined by the network equipment; or

[0274] The network device determines a threshold and / or offset value of a measurement quantity related to channel load in a cell reselection criterion.

[0275] 29. A communication system, comprising a network device and a terminal device,

[0276] Among them, the network device has a wireless link detection device as described in any one of Notes 18-28, and the network device has a wireless link detection device as described in any one of Notes 1-17.

Claims

1. A wireless link detection device, arranged in a terminal device, comprising: A first adjustment unit, which adjusts a counter of the number of transmissions of a random access preamble code in a process of radio link failure detection, wherein the adjusted process of radio link failure detection includes suspending the counter of the number of transmissions of the random access preamble code according to a parameter of a channel load measured by the terminal device; and A detection unit, which determines that a wireless link using an unlicensed frequency band has failed when a higher layer of the terminal device receives a random access problem indication and a second timer related to the reestablishment is not running.

2. The device according to claim 1, wherein: The first adjustment unit further adjusts a parameter for radio link failure detection, wherein the adjusted parameter for radio link failure detection includes at least one of the following parameters: the duration of the first timer, the number of out-of-sync indications that causes the first timer to start, the number of in-sync indications that causes the first timer to stop, and the duration of a fourth timer used to detect a fast radio link failure; Alternatively, the adjusted parameters for detecting radio link failure include at least one of the following parameters: Used to control the threshold of the number of transmissions of the random access preamble code for sending a random access problem indication to the upper layer of the terminal device, the window length of the window related to the random access response, and the duration of the third timer related to the random access contention resolution.

3. The device according to claim 1, wherein: The adjusted radio link failure detection process also includes: A second counter different from the counter for counting the number of transmissions of the random access preamble code is used, and when the second counter reaches a second number, the counter for the number of transmissions of the random access preamble code resumes counting, and the value of the second number is determined based on parameters provided by the network device for the transmission of synchronization signal blocks and / or reference signals.

4. The device according to claim 1, wherein: The channel load parameter refers to a parameter describing the channel usage status.

5. The device according to claim 4, wherein: The channel load parameter includes at least one of the following parameters: Channel busy rate, channel occupancy rate and pre-conversation monitoring success rate.

6. The device according to claim 5, wherein: The success rate of monitoring before conversation refers to the ratio of the number of successful monitoring before conversation in the third predetermined time period to the total number of monitoring before conversation in the third predetermined time period.

7. The device of claim 1, wherein: The device also includes: A first receiving unit receives a configuration of a network device, The first adjustment unit adjusts the parameters for detecting the wireless link failure based on the configuration of the network device.

8. The device of claim 1, wherein: The device also includes: A selection unit, when the radio link failure occurs in a primary cell group, the selection unit performs cell selection or cell reselection.

9. The device of claim 8, wherein: When the selection unit performs cell selection: In the cell selection criteria, the unlicensed frequency band uses a first threshold, and the first threshold is the same as or different from a second threshold used in the licensed frequency band; or The cell selection criterion is adjusted by an offset value related to the channel load determined by the network device; or, using, in a cell selection criterion, a measurement quantity related to a channel load determined by said network device; or In the cell selection criterion, a threshold value and / or an offset value of a measurement quantity related to the channel load determined by the network device is used.

10. The device of claim 8, wherein: When the selection unit performs cell reselection: The terminal device sets the priority of the unlicensed frequency band to be lower than the priority of the licensed frequency band; or The cell reselection criteria are adjusted by an offset value related to the channel load determined by the network device; or, using, in a cell reselection criterion, a measurement quantity related to a channel load determined by the network device; In the cell reselection criterion, a threshold value and / or an offset value of a measurement quantity related to the channel load determined by the network device is used.

11. The device of claim 1, wherein: The device also includes: The first sending unit sends the channel load parameter to the network device when a wireless link failure occurs. The channel load parameter includes at least one of a channel busy rate, a channel occupancy rate, and an LBT success rate.

12. The device of claim 11, wherein: The channel load parameter is sent via at least one of the following messages: Wireless resource control connection reconfiguration completion message, wireless resource control connection reconstruction completion message, wireless resource control connection reply completion message, wireless resource control connection establishment completion message, measurement report message, terminal equipment information response message, secondary cell group information report message.

13. The device of claim 1, wherein: The device also includes: A second adjustment unit is used to control the physical layer of the terminal device to determine whether to report the out-of-sync indication to the higher layer of the terminal device according to the relationship between the measurement amount and each threshold in the threshold combination, or according to the relationship between the parameter of the channel load and the threshold, Wherein, the threshold combination has at least 2 thresholds, The detection unit determines, based on the received out-of-synchronization indication and according to a parameter for radio link failure detection, that a radio link using the unlicensed frequency band has failed.

14. A wireless link detection device, arranged in a network device, comprising a configuration and sending unit, wherein: The terminal device is configured to adjust a counter of the number of transmissions of the random access preamble code during the process of radio link failure detection, wherein: The adjusted wireless link failure detection process includes suspending a counter of the number of transmissions of a random access preamble code according to a parameter of a channel load measured by the terminal device; or Parameters for indicating the transmission status of the synchronization signal block and / or the reference signal are sent to the terminal device so that the terminal device adjusts the parameters for the wireless link failure detection and / or the wireless link failure detection process.

15. The device of claim 14, wherein: The channel load parameter refers to a parameter describing the channel usage status.

16. The device of claim 14, wherein: The parameter sent by the network device to the terminal device for indicating the transmission status of the synchronization signal block and / or the reference signal includes at least one of the following parameters: The information of the synchronization signal blocks actually sent between the network device and the terminal setting, the offset of the reference signal and / or synchronization signal block actually sent, the number or number of times that transmission cannot be made due to LBT within a fourth predetermined time period, and the parameters of the channel load sent by the network device.

17. The device of claim 14, wherein: The device also includes: The second configuration unit configures one of the following parameters for the terminal device: In the cell selection criteria, a first threshold for use of an unlicensed frequency band, the first threshold being the same as or different from a second threshold for use of a licensed frequency band; or an offset value related to the channel load of the criterion used for cell selection determined by the network device; or, a measurement related to channel load used as a criterion for cell selection determined by the network equipment; or The network device determines a threshold value and / or an offset value of a measurement quantity related to channel load in a cell selection criterion.

18. The device of claim 14, wherein: The device also includes: A third configuration unit is configured to configure the parameters used by the terminal device for cell reselection as follows: The priority of licensed frequency bands is higher than the priority of unlicensed frequency bands; or an offset value related to the channel load of the criterion for cell reselection determined by the network device; or, A measurement related to channel load used as a criterion for cell reselection determined by the network equipment; or The network device determines a threshold and / or offset value of a measurement quantity related to channel load in a cell reselection criterion.

19. A communication system, comprising a network device and a terminal device, in, The network device has the wireless link detection device according to any one of claims 14 to 18, and the terminal device has the wireless link detection device according to any one of claims 1 to 13.

Images