A cell access method, device, medium and terminal

Abstract

The present invention provides a cell access method, device, medium and terminal. The method can be applied to the terminal. The method comprises: measuring the signal quality of the currently resident cell to obtain a measurement result; when the measurement result indicates that the signal quality of the currently resident cell does not meet a preset condition, triggering random access switching to an initial BWP for data transmission, and receiving SIB1. The method is used to ensure that the terminal receives SIB1 in time, so that the terminal can select a suitable cell to reside in and avoid frequent network searches.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a cell access method, device, medium and terminal. Background Art

[0002] With the development of communication technology, the fifth generation (5G) communication system has been widely studied to meet the needs of large-capacity and high-speed transmission.

[0003] Currently, a terminal device in the idle state of radio resource control (RRC) needs to receive system information (SI) in order to enter the RRC-connected state according to the SI. Specifically, after the introduction of the bandwidth part (BWP), the terminal device can receive the master system information block (MIB) through the synchronization signal (synchronizing signal) / physical broadcast channel (PBCH) block. The MIB contains the scheduling information of the system information block (SIB) 1. The terminal device can receive SIB1 on the physical downlink share control channel (PDSCH) according to the scheduling information in the MIB. Usually, SIB1 is carried on the initial BWP. SIB1 contains the scheduling information of other system information (OSI). Therefore, the terminal device can obtain the system information block concerned by the terminal device in the OSI received on the PDSCH according to the scheduling information in SIB1. According to the above system information block, the terminal device can perform an RRC connection and enter an RRC connected state from an RRC idle state.

[0004] However, when a cell switching occurs in the terminal, for example, the terminal switches from a long term evolution (LTE) cell to a new generation radio access technology (NR) cell, the network equipment cannot guarantee that the terminal will be switched to the initial BWP. If the network equipment switches the terminal to an additional BWP, the additional BWP does not include SIB1, resulting in the terminal being unable to receive SIB1. In the absence of SIB1, after the cell channel quality deteriorates, the cell loses synchronization, and the terminal initiates a full-bandwidth, full-standard network search, which directly affects the efficiency of the terminal in finding the network after losing the network, and affects the user experience.

[0005] Therefore, there is an urgent need to provide a cell access solution to improve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a cell access method, device, medium and terminal, so as to ensure that the terminal receives SIB1 in time, so that the terminal can select a suitable cell to reside in and avoid frequent network searching.

[0007] In a first aspect, the present invention provides a cell access method, the method comprising: measuring the signal quality of the currently resident cell to obtain a measurement result; when the measurement result indicates that the signal quality of the currently resident cell does not meet a preset condition, triggering random access switching to an initial BWP for data transmission, and receiving a system information block SIB1.

[0008] The beneficial effect of the cell access method provided by the present invention is that: in the above method, after the terminal undergoes cell switching, when the measurement result indicates that the signal quality of the currently resident cell does not meet the preset conditions, the terminal actively switches to the initial BWP to try to send and receive data, and obtains SIB1, thereby obtaining a neighboring cell list, so that even if the cell suddenly loses synchronization and cannot be recovered, the terminal can use the neighboring cell list to more quickly find a suitable cell to reside in, so as to ensure the stability of the terminal, facilitate the terminal to quickly resume business, and improve user experience.

[0009] In a possible embodiment, before triggering random access switching to the initial BWP for data transmission, it also includes: judging whether the currently activated bandwidth part BWP is the initial BWP; if the currently activated BWP is not the initial BWP, triggering random access switching to the initial BWP for data transmission; if the currently activated BWP is not the initial BWP, and the currently activated BWP does not include SIB1, triggering random access switching to the initial BWP for data transmission, and receiving the system information block SIB1. Thus, the neighboring cell list is obtained, so that even if the cell suddenly loses synchronization and cannot be recovered, the terminal can use the neighboring cell list to find a suitable cell to reside faster, so as to ensure the stability of the terminal, facilitate the terminal to quickly restore the service, and improve the user experience.

[0010] In a possible embodiment, the method further includes: if the currently activated BWP is the initial BWP, receiving SIB1, thereby obtaining a neighboring cell list, so that even if the cell suddenly loses synchronization and cannot be restored, the terminal can use the neighboring cell list to more quickly find a suitable cell to reside in, so as to ensure the stability of the terminal, facilitate the terminal to quickly restore services, and improve user experience.

[0011] In a possible embodiment, the measurement result indicates that the signal quality of the currently camped cell does not meet a preset condition, including: the measurement result indicates that the signal-to-noise ratio is less than a set threshold, or does not meet the camping condition.

[0012] In a possible embodiment, before measuring the signal quality of the currently resident cell, the method further includes: switching from a cell in the first communication system to the resident cell in the second communication system. This method can be applicable to the scenario of inter-system switching.

[0013] In a second aspect, an embodiment of the present invention further provides a communication device, which includes a module / unit for executing any possible design method of the second aspect. These modules / units can be implemented by hardware, or by executing corresponding software implementations by hardware.

[0014] In a third aspect, an embodiment of the present invention provides a terminal, including a processor and a memory, wherein the memory is used to store one or more computer programs; when the one or more computer programs stored in the memory are executed by the processor, the terminal can implement any possible design method of the first aspect.

[0015] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium includes a computer program, and when the computer program runs on a terminal device, the terminal executes any possible design method of the first aspect above.

[0016] In a fifth aspect, an embodiment of the present invention further provides a method comprising a computer program product, which, when executed on a terminal, enables the terminal to execute any possible design of the first aspect.

[0017] In a sixth aspect, an embodiment of the present invention further provides a chip or a chip module, wherein the chip or the chip module is coupled to a memory and is used to execute a computer program stored in the memory, so that the terminal executes any possible design method of any of the above aspects.

[0018] For the beneficial effects of the second to sixth aspects, reference may be made to the description of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a communication system architecture provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a cell access method flow provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of another cell access method flow provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a communication device provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a terminal structure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] At present, when the terminal switches from the LTE cell to the NR cell, if the current activated BWP of the terminal after switching is not the initial BWP, the current BWP may not have SIB1, resulting in the inability to receive SIB1; or, even if the activated BWP after switching is the initial BWP, but the search space SIB1 (SearchSpaceSIB1) is set to omited (Omitted), or the network side has not configured the dedicated SIB1-transmission (dedicatedSIB1-Delivery) parameter, then the terminal cannot receive SIB1, and cannot obtain OSI from SIB1, and naturally cannot obtain the neighboring cell list. In this scenario, once the terminal enters the cell edge coverage or the signal is blocked, or the terminal is in a high-speed operation scenario, the signal quality of the cell will deteriorate rapidly, the cell will be out of sync, and the terminal will not be able to quickly find a suitable cell to reside, so the terminal has to start full-standard, full-bandwidth network search. Because the full-standard, full-bandwidth network search has the defects of slow network search speed and the terminal cannot be used normally during the network search, it will greatly affect the user experience.

[0026] In order to solve the above problems, the present invention provides a cell access solution. In this solution, when a terminal switches from a cell in a first communication system to a cell in a second communication system, due to cell switching and the channel environment of the switched cell deteriorating, the terminal can actively switch to the initial BWP to try to send and receive data, and can also obtain SIB1, thereby obtaining a neighboring cell list. In this way, even if the cell suddenly loses synchronization and cannot be recovered, the terminal can use the neighboring cell list to find a suitable cell to reside in more quickly, so as to ensure the stability of the terminal, facilitate rapid recovery of services, and improve user experience.

[0027] The technical solutions in the embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. Among them, in the description of the embodiments of the present invention, the terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present invention. As used in the specification of the present invention and the attached claims, the singular expressions "a", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present invention, "at least one", "one or more" refer to one or more than two, and more than two also include two. The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist; in a possible embodiment, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0028] References to "one embodiment" or "some embodiments" described in this specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", and "in some other embodiments" that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. The term "connected" includes direct and indirect connections, unless otherwise stated. "First" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0029] In the embodiments of the present invention, the words "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific way.

[0030] The present invention will present various aspects, embodiments or features around a system that may include multiple devices, components, modules. It should be understood and appreciated that each system may include additional devices, components, modules, and / or may not include all of the devices, components, modules discussed in conjunction with the drawings. In addition, combinations of these schemes may also be used.

[0031] The technical solutions of the embodiments of the present invention can be applied to various communication systems. In one possible embodiment, the various communication systems may be long term evolution (LTE) systems, worldwide interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) systems, and future communication systems. In one possible embodiment, the 5G system may be a new generation of radio access technology (NR), and the future communication system may be a sixth generation (6G) system. In the embodiments of the present invention, some scenarios are described using the scenarios of NR networks in wireless communication networks as examples. It should be noted that the solutions in the embodiments of the present invention may also be applied to other wireless communication networks, and the corresponding names may also be replaced by the names of corresponding functions in other wireless communication networks.

[0032] Some of the terms used below are explained below to facilitate understanding by those skilled in the art.

[0033] (1)SSB

[0034] The SSB in the present invention is a synchronization signal (synchronizing signal) / physical broadcast channel block (physical broadcast channel, PBCH) block, that is, SSB is SS / PBCH block. That is to say, in the present invention, SSB and SS / PBCH block can be replaced with each other.

[0035] (2) Bandwidth part (BWP)

[0036] Since the NR frequency band is wider than the LTE frequency band, according to the current spectrum division method, the NR frequency band is at least 100MHz, and different terminal devices have different RF capabilities and can support different maximum bandwidths, so the concept of BWP is introduced. By allocating part of the spectrum to the terminal device on a broadband, it can adapt to the bandwidth supported by the terminal device. In addition, by configuring a variety of BWPs with different bandwidths for the terminal device, flexible scheduling of the terminal device and energy saving of the terminal device can be achieved.

[0037] (3) Initial BWP

[0038] The initial BWP refers to the BWP of the terminal device when it initially accesses a cell or a broadband carrier from the RRC-idle state. Alternatively, the initial BWP can also be understood as the bandwidth of the location of SIB1 indicated by the MIB broadcast in the SSB, which can be defined as the initial BWP. On the initial BWP, the terminal device can obtain SIB1 and other system information (OSI), and can monitor paging messages.

[0039] (4) Activate BWP

[0040] When a service arrives at a terminal device, the network device schedules the terminal device from the initial BWP to a BWP whose bandwidth matches its service. This BWP is called an activated BWP.

[0041] According to the current standard, the activated BWP is configured with a common search space of Type 0A and Type 2 physical downlink control channel (PDCCH), that is, the terminal device can receive paging messages on the currently activated BWP.

[0042] (5) System information (SI)

[0043] SI may include minimum system information (MSI) and other system information (OSI).

[0044] Among them, OSI may include all SIBs except SIB1, for example, OSI may include SIB2 to SIB14. Different SIBs carry different parameters and have different functions. For example, it may include system information related to cell reselection, public warning information (Public Warning System, PWS), timing (for example, (Global Positioning System, global positioning system, GPS) time, Coordinated Universal Time (Coordinated Universal Time, UTC) information, etc.), V2X services (for example, SL sending resource pool, SL receiving resource pool, SL configuration information, etc.) or positioning. Among them, PWS includes ETWS (Earthquake and Tsunami Warning System) notification or CMAS (Commercial Mobile Alert Service, Public Mobile Warning Service) notification, etc.

[0045] SIB1 can carry scheduling information of other SIBs. For example, the mapping relationship between SIB and SI message, the window length of SI message (for example, SI-windowlength), and the period of SI message; wherein, the period of SI message refers to the interval at which the window of each SI message is repeated, that is, the interval between two windows of the same SI message; the window length of SI message refers to the window length of each SI message, and the window length of SI messages under a network device can be the same. SIB1 can also include information indicating whether each SIB is always broadcast or provided on-demand, as well as configuration information required when requesting system information, such as preamble and / or resource configuration. SIB1 can also be called system information block type1.

[0046] It should be noted that the system information in the present invention may be an SI message or a SIB. That is, the system information described below in the present invention may include an SI message or a SIB.

[0047] It should be understood that, for a certain terminal, the terminal does not care about all SIBs in the OSI, but may only care about some SIBs in the OSI, that is, only cares about the SIBs related to itself.

[0048] (6) Public Search Space

[0049] The common search space may include search spaces for paging, random access (RA), SIB1, and other SI.

[0050] If the search space for random access is not configured on the BWP (for example, there is no ra-SearchSpace), the terminal device cannot receive MSG2 sent by the network device on the BWP, that is, it cannot obtain the SI message based on the random access process. In other words, the BWP on which the terminal device in the connected state works is not configured with a public search space, and the process of requesting system information (on demand SI) based on random access cannot be implemented.

[0051] If the search space for SIB1 is not configured on the BWP (for example, there is no searchSpaceSIB1), the terminal device cannot receive the SIB1 broadcast by the network device on the BWP.

[0052] If the search space for other SI is not configured on the BWP (for example, there is no searchSpaceOtherSystemInformation), the terminal device cannot receive other SI broadcast by the network device on the BWP.

[0053] If the search space for paging is not configured on the BWP (for example, there is no pagingSearchSpace), the terminal device cannot receive paging on the BWP.

[0054] To facilitate understanding of the embodiments of the present invention, first Figure 1 The communication system shown in FIG. 1 is used as an example to describe in detail a communication system applicable to an embodiment of the present invention. Figure 1 FIG. 1 is a schematic diagram showing a communication system applicable to a cell access method according to an embodiment of the present invention. Figure 1As shown, the communication system 100 includes a network device 102 and a terminal 106. The network device 102 may be configured with one or more antennas, and the terminal may also be configured with one or more antennas. Optionally, the communication system may also include a network device 104, and the network device 104 may also be configured with multiple antennas.

[0055] It should be understood that the network device 102 or the network device 104 may also include multiple components related to signal transmission and reception. In a possible embodiment, the multiple components related to signal transmission and reception may include at least one of a processor, a modulator, a multiplexer, a demodulator, or a demultiplexer.

[0056] Among them, the network device is a device with wireless transceiver functions or a chip that can be set in the device. The device includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station, baseband unit (BBU), access point (AP) in wireless fidelity (WIFI) system, wireless relay node, wireless backhaul node, transmission point (transmission and reception point, TRP or transmission point, TP), and can also be 5G, such as NR, gNB in ​​the system, or transmission point (TRP or TP), one or a group of (including multiple antenna panels) antenna panels of a base station in the 5G system, or, it can also be a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU, distributed unit).

[0057] In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include a radio unit (RU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB, for example, the CU implements the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers, and the DU implements the functions of the radio link control (RLC), media access control (MAC) and physical (PHY) layers. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling or PHCP layer signaling, can also be considered to be sent by the DU, or by the DU+RU. It can be understood that the network device can be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into a network device in the access network RAN, and the CU can also be divided into a network device in the core network CN, which is not limited here.

[0058] The terminal 106 may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal in the embodiment of the present invention may be a mobile phone, a tablet computer (Pad), a smart printer, a train detector, a gas station detector, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, and a wireless terminal in smart home. The embodiment of the present invention does not limit the application scenario. In the present invention, the aforementioned terminal 106 and the chip that can be set in the aforementioned terminal 106 are collectively referred to as a terminal.

[0059] Both the network device 102 and the network device 104 can communicate with multiple terminals. In a possible implementation, both the network device 102 and the network device 104 can communicate with the terminal 106 shown in the figure. The network device 102 and the network device 104 can communicate with any number of terminals similar to the terminal 106. However, it should be understood that the terminal communicating with the network device 102 and the terminal communicating with the network device 104 can be the same or different. Figure 1 The terminal 106 shown in the figure can communicate with the network device 102 and the network device 104 at the same time, but this only shows one possible scenario. In some scenarios, the terminal may only communicate with the network device 102 or the network device 104, and the present invention is not limited to this.

[0060] It should be understood that Figure 1 This is a simplified schematic diagram for ease of understanding only. The communication system may also include other network devices or other terminals. Figure 1 Not drawn in.

[0061] An embodiment of the present invention provides a cell access method, which can be executed by a terminal. The terminal in the following content of the embodiment of the present invention can be Figure 1 The terminal 106 shown in the figure, the network device in the following content can be Figure 1 The network device 102 is shown. It should be understood that in the present invention, the steps executed by the terminal can also be specifically executed by a module or component of the terminal, such as a chip in the terminal. The following embodiments are described with the terminal as the execution subject.

[0062] like Figure 2 As shown, a cell access method provided by an embodiment of the present invention is shown, and the method includes:

[0063] S201, measuring the signal quality of the currently resident cell to obtain a measurement result.

[0064] S202: When the measurement result indicates that the signal quality of the currently resident cell does not meet a preset condition, trigger random access switching to the initial BWP for data transmission and receiving SIB1.

[0065] In S202, in a possible implementation, before triggering random access switching to the initial BWP for data transmission, it is further possible to determine whether the currently activated BWP is the initial BWP. If it is not the initial BWP, random access switching to the initial BWP for data transmission and receiving SIB1 are triggered. If the currently activated BWP is the initial BWP, SIB1 is received.

[0066] For example, when the terminal switches from the LTE cell to the NR cell, the channel quality of the NR cell deteriorates, such as the signal to noise ratio (SNR) is less than the set threshold, or the cell does not meet the cell residence conditions (such as the residence conditions include: successfully reading the system information of the cell and meeting the cell selection S criteria). At this time, if the currently activated BWP is a non-initial BWP, such as an additional BWP, the terminal is likely to be unable to receive SIB1. Therefore, it is necessary to trigger random access switching to the initial BWP for data transmission. Afterwards, the terminal initiates random access on the Initial BWP, and the network will switch both the uplink and downlink BWP to the Initial BWP accordingly, which can ensure the continuity of data reception. At the same time, the service is switched from the currently activated BWP to the Initial BWP. Replacing the BWP will also improve the sending and receiving of terminal data, because SIB1 contains scheduling information of other system information (OSI), and then the terminal obtains the neighboring cell list from OSI. When the resident cell continues to deteriorate and loss of synchronization occurs, the terminal can prioritize the neighboring cell list obtained from OSI to initiate registration, restore the service as quickly as possible, and provide users with a better experience.

[0067] In a possible embodiment, when the terminal executes the above S202, when the measurement result indicates that the signal quality of the currently resident cell does not meet the preset conditions, even if the currently activated BWP is a non-initial BWP, the terminal can continue to determine whether the currently activated BWP includes SIB1. If the currently activated BWP includes SIB1, the terminal receives SIB1; if the currently activated BWP does not include SIB1, the random access switch is triggered to the initial BWP for data transmission and reception of SIB1.

[0068] In another possible embodiment, when the terminal executes the above S202, after determining that the channel quality of the resident cell has deteriorated, the terminal may continue to determine whether the network side provides candidate BWPs or candidate cells, and whether to configure dedicatedSIB1-Delivery parameters. The following different situations may exist according to different judgment results.

[0069] In case a, if the network side does not provide a candidate BWP or a candidate cell, and does not configure the dedicatedSIB1-Delivery parameter, the terminal needs to continue to determine whether the currently activated BWP is not the initial BWP, that is, execute the above S203 to S204.

[0070] In case b, if any one of the candidate BWP or candidate cell provided by the network side and the dedicatedSIB1-Delivery parameter configured is met, the terminal may execute S202 to S204 without executing the above method steps.

[0071] In case c, if the network side does not provide candidate BWP or candidate cell, and does not configure dedicatedSIB1-Delivery parameters, regardless of whether the SearchSpaceSIB1 parameters are configured, it is still necessary to continue to determine whether the currently activated BWP is not the initial BWP, that is, execute the above S203 to S204. Specifically, assuming that after the terminal switches from LTE to NR, the terminal's activated BWP (FirstActBWP) is not configured with SearchSpaceSib1, and according to the protocol, the terminal does not need to receive SIB1. (1). If the terminal's currently activated BWP is InitialBWP, the terminal can SearchSpaceSib1 configuration information, actively receive SIB1, and subsequently request OSI to help the terminal understand the status of neighboring cells and select the best cell for the terminal. (2). If the terminal's currently activated (active) BWP is an additional (Additional) BWP, if SIB1 is in the activated (active) BWP, then ignore the SearchSpaceSib1 configuration and receive SIB1 normally; if SIB1 is outside the active BWP, the terminal cannot receive SIB1. At this time, the terminal actively triggers random access switching to receive SIB1 on InitialBWP, and at the same time, it can ensure that the uplink and downlink DCI are not lost. In another scenario, after LTE switches to NR, FirstActBWP is configured with SearchSpaceSib1. According to the protocol, the terminal needs to receive SIB1. (1). If the currently activated BWP is InitialBWP, receive SIB1 normally; (2). If the currently activated BWP is AdditionalBWP, if SIB1 is in the activated (active) BWP, then ignore the SearchSpaceSib1 configuration and receive SIB1 normally; if SIB1 is outside the active BWP, the terminal cannot receive SIB1. At this time, the terminal actively triggers random access switching to receive SIB1 on InitialBWP, and at the same time, it can ensure that the uplink and downlink DCI are not lost. In this way, when the terminal switches to InitialBWP, after receiving SIB1 and the neighboring cell list obtained from OSI, the cell continues to deteriorate, and the NR cell loses synchronization, the terminal prioritizes finding a suitable cell from the neighboring cell list obtained from OSI to initiate registration and restore services as quickly as possible.

[0072] Exemplarily, in one possible case, when the terminal switches from the LTE cell to the NR cell, after the terminal determines that the channel quality of the resident cell has deteriorated, the network side does not provide candidate BWP or candidate cells, and does not configure the dedicatedSIB1-Delivery parameter. If the currently activated BWP is a non-initial BWP, such as an additional BWP, the terminal is likely to be unable to receive SIB1. The terminal then actively switches to the initial BWP to try to send and receive data and obtain SIB1. In another possible case, if the network side does not configure SearchSpaceSIB1, but the currently activated BWP has the same SCS and CP length as the Initial BWP and Coreset0 is included in the activated BWP, then Coreset0=0, Searchspace0=0, so that the PDCCH time-frequency domain position for scheduling SIB1 can be determined, and therefore SIB1 can be obtained.

[0073] In a possible embodiment, when the terminal executes the above S202, after determining that the channel quality of the resident cell has deteriorated, the terminal can continue to determine whether the network side provides candidate BWP or candidate cells, and whether dedicatedSIB1-Delivery parameters and SearchSpaceSIB1 parameters are configured. If the network side does not provide candidate BWP or candidate cells, and does not configure dedicatedSIB1-Delivery parameters, the terminal needs to continue to determine whether the currently activated BWP is not the initial BWP; if the network side provides candidate BWP or candidate cells, and configures any one of the dedicatedSIB1-Delivery parameters, the terminal can receive SIB1.

[0074] In order to more systematically explain the above-mentioned cell access method, the following takes the case where the terminal switches from the LTE cell to the NR cell and the signal quality of the NR cell deteriorates as an example to illustrate the cell access method flow chart of the above-mentioned terminal. Figure 3 shown.

[0075] S301: After the terminal accesses the NR cell, the signal quality measurement is started and the signal-to-noise ratio is calculated.

[0076] S302, determine whether the signal-to-noise ratio is greater than or equal to the set threshold, whether the network side provides candidate BWPs or candidate cells, and whether dedicatedSIB1-Delivery parameters are configured. If not, execute S303, otherwise, do nothing.

[0077] S303, the terminal continues to determine whether the currently activated BWP is the initial BWP, if not, execute S304, otherwise execute S305.

[0078] S304, the terminal may continue to determine whether the currently activated BWP includes SIB1, if so, execute S305, otherwise execute S306.

[0079] S305, the terminal triggers random access and switches to the initial BWP for data transmission and receives SIB1.

[0080] S306, the terminal actively receives SIB1.

[0081] Based on the above steps, the terminal can then obtain a neighboring cell list from OSI. When the resident cell continues to deteriorate and a loss of synchronization occurs, the terminal can prioritize finding a suitable cell from the neighboring cell list obtained from OSI to initiate registration, restore services as quickly as possible, and provide users with a better experience.

[0082] Similar to the concept of the above embodiment, the embodiment of the present invention further provides a communication device, and the communication device 400 is used to implement the function of the terminal in the above method. For example, the communication device 400 can be a terminal, or a device in a terminal. The device can be a chip system. In the embodiment of the present invention, the chip system can be composed of a chip, or can include a chip and other discrete devices. Figure 4 As shown, the communication device 400 includes a measuring unit 401, a judging unit 402, a switching unit 403 and a receiving unit 404, wherein:

[0083] The measuring unit 401 is used to measure the signal quality of the currently resident cell and obtain a measurement result.

[0084] The judging unit 402 is configured to judge whether the signal quality of the currently resident cell indicated by the measurement result meets a preset condition;

[0085] The switching unit 403 is configured to trigger random access switching to the initial BWP for data transmission when the measurement result indicates that the signal quality of the currently resident cell does not meet a preset condition.

[0086] The receiving unit is configured to receive SIB1 on an initial BWP.

[0087] In a possible embodiment, before triggering random access switching to the initial BWP for data transmission, the judging unit 402 is further configured to: judge whether the currently activated bandwidth part BWP is the initial BWP;

[0088] The switching unit 403 is specifically configured to: if the currently activated BWP is not the initial BWP, trigger random access switching to the initial BWP for data transmission.

[0089] In a possible embodiment, the switching unit 403 is specifically configured to: if the currently activated BWP is not the initial BWP and the currently activated BWP does not include SIB1, trigger random access switching to the initial BWP for data transmission.

[0090] In a possible embodiment, the receiving unit 404 is configured to directly receive SIB1 if the currently activated BWP is an initial BWP.

[0091] In a possible embodiment, the measurement result indicates that the signal quality of the currently camped cell does not meet a preset condition, including: the measurement result indicates that the signal-to-noise ratio is less than a set threshold, or does not meet the camping condition.

[0092] In a possible embodiment, before measuring the signal quality of the currently resident cell, the switching unit 403 is further configured to: switch from a cell in the first communication system to the resident cell in the second communication system.

[0093] For the specific implementation process and beneficial effects of the above units, please refer to the above Figure 2 and Figure 3 The description in the relevant method embodiment.

[0094] The division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. Figure 5 As shown, the communication device 500 includes at least one processor 510 and a memory 520, and a communication interface 530. Among them, a computer program is stored in the memory 520. The memory 520 and the processor 510 are coupled. The coupling in the embodiment of the present invention is an interval coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. As another implementation, the memory 520 can also be located outside the communication device 500. The processor 510 can operate in conjunction with the memory 520. The processor 510 can call the computer program stored in the memory 520. At least one of the at least one memory can be included in the processor.

[0095] In the embodiments of the present invention, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. In a possible embodiment, the general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present invention may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0096] In an embodiment of the present invention, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or a volatile memory. In a possible implementation, the volatile memory may be a random-access memory (RAM). The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in an embodiment of the present invention may also be a circuit or any other device that can implement a storage function, for storing computer programs and / or data.

[0097] The method provided in the embodiment of the present invention can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program is loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. In a possible implementation, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wire. In a possible embodiment, the wired connection method can be a coaxial cable, an optical fiber or a digital subscriber line (DSL), or the computer instructions can be transmitted from one website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wireless means. In a possible embodiment, the wired connection method can be infrared, wireless or microwave. The computer-readable storage medium can be any medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more media integrations. In a possible implementation, the medium may be a magnetic medium, an optical medium, or a semiconductor medium.

[0098] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A cell access method, characterized in that: Applied to a terminal, the method comprises: Measure the signal quality of the cell currently being occupied and obtain the measurement result; When the measurement result indicates that the signal quality of the currently camped cell does not meet the preset condition, determine whether the network side provides a candidate BWP or a candidate cell, and whether to configure a dedicatedSIB1-Delivery parameter; If the network side does not provide a candidate BWP or a candidate cell, and the dedicatedSIB1-Delivery parameter is not configured, it is determined whether the currently activated bandwidth part BWP is the initial BWP; if the currently activated BWP is not the initial BWP, random access is triggered to switch to the initial BWP for data transmission, and the system information block SIB1 is received; If any of the candidate BWP or candidate cell provided by the network side and the dedicatedSIB1-Delivery parameter is configured, no processing is performed.

2. The method according to claim 1, characterized in that: If the currently activated BWP is not the initial BWP, random access switching is triggered to the initial BWP for data transmission, including: If the currently activated BWP is not the initial BWP and the currently activated BWP does not include SIB1, random access switching is triggered to the initial BWP for data transmission.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: If the currently activated BWP is the initial BWP, SIB1 is received.

4. The method according to any one of claims 1 to 2, characterized in that: The measurement result indicates that the signal quality of the currently camped cell does not meet a preset condition, including: the measurement result indicates that the signal-to-noise ratio is less than a set threshold, or does not meet the camping condition.

5. The method according to any one of claims 1 to 2, characterized in that: Before measuring the signal quality of the currently resident cell, the method further includes: Handover from a cell in the first communication system to the camped cell in the second communication system.

6. A communication device, used to implement the cell access method according to any one of claims 1 to 5, characterized in that: include: The measuring unit is used to measure the signal quality of the cell currently resident and obtain the measurement result; A judging unit, configured to judge whether the signal quality of the currently resident cell indicated by the measurement result meets a preset condition; A switching unit, configured to trigger random access switching to an initial BWP for data transmission when the measurement result indicates that the signal quality of the currently resident cell does not meet a preset condition; The receiving unit is configured to receive a system information block SIB1 on the initial BWP.

7. The device according to claim 6, characterized in that Before triggering random access to switch to the initial BWP for data transmission, the judging unit is further used to: judge whether the currently activated bandwidth part BWP is the initial BWP; The switching unit is specifically configured to: if the currently activated BWP is not the initial BWP, trigger random access switching to the initial BWP for data transmission.

8. The device according to claim 7, characterized in that The switching unit is specifically configured to: if the currently activated BWP is not the initial BWP and the currently activated BWP does not include SIB1, trigger random access switching to the initial BWP for data transmission.

9. The device according to claim 7 or 8, characterized in that The device also includes: The receiving unit is configured to receive SIB1 if the currently activated BWP is the initial BWP.

10. The device according to any one of claims 6 to 8, characterized in that The measurement result indicates that the signal quality of the currently camped cell does not meet a preset condition, including: the measurement result indicates that the signal-to-noise ratio is less than a set threshold, or does not meet the camping condition.

11. The device according to any one of claims 6 to 8, characterized in that Before measuring the signal quality of the currently resident cell, the switching unit is further configured to: Handover from a cell in the first communication system to the camped cell in the second communication system.

12. A terminal, characterized in that: include: A processor and a memory, wherein the memory is used to store a computer program; The processor is configured to execute the computer program stored in the memory, so that the terminal executes the method according to any one of claims 1 to 5.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

Images