CN113923741A

CN113923741A - Cell access method, device, medium and terminal

Info

Publication number: CN113923741A
Application number: CN202111341560.XA
Authority: CN
Inventors: 陈雷
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-01-11
Also published as: WO2023083354A1

Abstract

The invention provides a cell access method, a device, a medium and a terminal, wherein the method can be applied to the terminal and comprises the following steps: measuring the signal quality of the current resident cell to obtain a measurement result; and when the measurement result indicates that the signal quality of the cell where the terminal currently resides does not meet the preset condition, triggering the random access to switch to the initial BWP for data transmission, and receiving the SIB 1.

Description

Cell access method, device, medium and terminal

Technical Field

The present invention relates to the field of communications, and in particular, to a cell access method, apparatus, medium, and terminal.

Background

With the development of communication technology, the fifth generation (5th generation, 5G) communication system is widely researched to meet the requirement of large capacity and high rate transmission.

Currently, a terminal device in a Radio Resource Control (RRC) idle state (idle) needs to receive System Information (SI) to enter a radio resource control connected state (RRC-connected) according to the SI. Specifically, after introducing the bandwidth part (BWP), the terminal device may receive a main system information block (MIB) through a synchronization signal (synchronization signal)/physical broadcast channel block (PBCH) block. The MIB contains scheduling information of a System Information Block (SIB) 1, and the terminal device may receive, according to the scheduling information in the MIB, a SIB1 on physical downlink shared control information (PDSCH), where the SIB1 is usually carried on an Initial (Initial) BWP. SIB1 includes scheduling information of Other System Information (OSI), so the terminal device can acquire a system information block of interest to the terminal device in the OSI received on the PDSCH according to the scheduling information in SIB 1. According to the system information block, the terminal device can perform RRC connection, and enter an RRC connected (connected) state from an RRC idle state.

However, when a terminal is handed over to a cell, for example, in a scenario where the terminal is handed over from a Long Term Evolution (LTE) cell to a new radio access technology (NR) cell, a network device cannot guarantee that the terminal is handed over to an Initial (Initial) BWP, and if the network device hands the terminal to an Additional (Additional) BWP, the terminal cannot receive an SIB1 because the Additional BWP does not include an SIB1, and in the absence of the SIB1, after channel quality of the cell deteriorates, the cell is out of step, the terminal initiates full bandwidth and full format network finding, which directly affects efficiency of network finding after the terminal loses network and affects user experience.

Therefore, it is desirable to provide a cell access scheme to improve the above problems.

Disclosure of Invention

The invention aims to provide a cell access method, a device, a medium and a terminal, which are used for ensuring that the terminal receives an SIB1 in time so as to be convenient for the terminal to select a proper cell to reside and avoid frequent network searching.

In a first aspect, the present invention provides a cell access method, including: measuring the signal quality of the current resident cell to obtain a measurement result; and when the measurement result indicates that the signal quality of the cell where the current cell resides does not meet the preset condition, triggering the random access to switch to the initial BWP for data transmission, and receiving a system information block SIB 1.

The cell access method provided by the invention has the beneficial effects that: in the method, after the terminal is switched among the cells, when the measurement result indicates that the signal quality of the cell where the terminal resides currently does not meet the preset condition, the terminal actively switches to the initial BWP to attempt to receive and send data and acquire the SIB1, thereby acquiring the neighbor list.

In a possible embodiment, before triggering the random access to switch to the initial BWP for data transmission, the method further includes: judging whether the currently activated bandwidth part BWP is the initial BWP or not; if the current activated BWP is not the initial BWP, triggering random access to be switched to the initial BWP for data transmission; if the currently activated BWP is not the initial BWP and the SIB1 is not included in the currently activated BWP, the random access is triggered to switch to the initial BWP for data transmission, and the system information block SIB1 is received. Therefore, the neighbor cell list is obtained, and even if the cell suddenly loses step and cannot be recovered, the terminal can also find a proper cell for residing by using the neighbor cell list more quickly so as to ensure the stability of the terminal, facilitate the terminal to recover services quickly and improve the user experience.

In one possible embodiment the method further comprises: if the currently active BWP is the initial BWP, the SIB1 is received. Therefore, the neighbor cell list is obtained, and even if the cell suddenly loses step and cannot be recovered, the terminal can also find a proper cell for residing by using the neighbor cell list more quickly so as to ensure the stability of the terminal, facilitate the terminal to recover services quickly and improve the user experience.

In a possible embodiment, the measuring result indicates that the signal quality of the currently camped cell does not satisfy a preset condition, including: the measurement result indicates that the signal-to-noise ratio is less than a set threshold or that the dwell condition is not met.

In a possible embodiment, before measuring the signal quality of the cell where the current cell resides, the method further includes: the method can be applied to the scene of inter-system handover when the cell in the first communication system is handed over to the resident cell in the second communication system.

In a second aspect, the present invention further provides a communication device, which includes a module/unit for executing the method of any one of the possible designs of the second aspect. These modules/units may be implemented by hardware, or by hardware executing corresponding software.

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; the one or more computer programs stored in the memory, when executed by the processor, enable the terminal to implement the method of any one of the possible designs of the first aspect described above.

In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a computer program, and when the computer program runs on a terminal device, the terminal device is caused to execute any one of the possible design methods of the first aspect.

In a fifth aspect, an embodiment of the present invention further provides a computer program product, which, when running on a terminal, causes the terminal to execute any one of the possible designs of the first aspect.

In a sixth aspect, an embodiment of the present invention further provides a chip or a chip module, where the chip or the chip module is coupled to a memory, and is configured to execute a computer program stored in the memory, so that the terminal performs any one of the possible design methods in any one of the above aspects.

As for the advantageous effects of the above second to sixth aspects, reference may be made to the description in the above first aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a cell access method according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of another cell access method according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a communication device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

Currently, after a terminal is handed over from an LTE cell to an NR cell, if the currently handed over active BWP of the terminal is not the initial BWP, the current BWP may not have SIB1, resulting in failure to receive SIB 1; or, even if the active BWP after the handover is the initial BWP, the search space SIB1 (searchbace SIB1) is set to null (identified), or the network side has not configured the dedicated SIB 1-transmission (dedicatedbsib 1-Delivery) parameter, then the terminal cannot receive the SIB1, and cannot acquire the OSI from the SIB1, and naturally cannot obtain the neighbor list. In such a scenario, once the terminal enters a 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, and the cell is out of step, the terminal cannot quickly find a suitable cell to reside, so that the terminal has to start a full-system and full-bandwidth network search. The user experience can be greatly influenced because the network searching speed is low and the terminal cannot be normally used during the network searching process in the full-system and full-bandwidth network searching.

In order to solve the above problem, the present invention provides a cell access scheme, where when a terminal is handed over from a cell in a first communication system to a cell in a second communication system, the terminal can actively switch to attempt to send and receive data on an initial BWP due to cell handover and channel environment of the cell after handover deteriorates, and meanwhile, can acquire an SIB1 to acquire a neighbor list, so that even if the cell suddenly loses synchronization and cannot be recovered, the terminal can use the neighbor list to more quickly find a suitable cell for camping, thereby ensuring stability of the terminal, facilitating quick recovery of services, and improving user experience.

The technical solution in the embodiment of the present invention is described below with reference to the drawings in the embodiment of the present invention. In the description of the embodiments of the present invention, the terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present invention, "at least one" and "one or more" mean one or more than two, and two or more also include two. The term "and/or" is used to describe an association relationship that associates objects, meaning that three relationships may exist; in one possible embodiment, a and/or B, may represent: a alone, both A and B, and B alone, where A, B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Reference in the specification to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the invention. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment, but rather mean "one or more, but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise. The term "coupled" includes both direct and indirect connections, unless otherwise noted. "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

In the embodiments of the present invention, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "e.g.," is intended to present relevant concepts in a concrete fashion.

The invention will present various aspects, embodiments or features around a system that may include a number of devices, components, modules. It is to be understood and appreciated that the various systems may include additional devices, components, modules, and/or may not include all of the devices, components, modules discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.

The technical scheme of the embodiment of the 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 (5th Generation, 5G) systems, future communication systems. In one possible embodiment, the 5G system may be a new radio access technology (NR) and the future communication system may be a 6th Generation (6G) system. Some of the scenarios in the embodiment of the present invention are described by taking a scenario of an NR network in a wireless communication network as an example, it should be noted that the scheme in the embodiment of the present invention may also be applied to other wireless communication networks, and corresponding names may also be replaced by names of corresponding functions in other wireless communication networks.

Hereinafter, some terms referred to hereinafter will be explained to facilitate understanding by those skilled in the art.

(1)SSB

The SSB in the present invention is a synchronization signal (synchronization signal)/Physical Broadcast Channel (PBCH) block, that is, the SSB is an SS/PBCH block. That is, in the present invention, SSB and SS/PBCH block may be replaced with each other.

(2) Bandwidth part (BWP)

Since the NR frequency band is wider than the LTE frequency band, according to the current spectrum division mode, the NR frequency band is at least 100MHz, and the maximum bandwidths that can be supported by different terminal devices are different due to different radio frequency capabilities, so the BWP concept is introduced. By allocating a portion of the spectrum for the terminal device over a wide band, the bandwidth that can be supported by the terminal device can be accommodated. And, by configuring a plurality of BWPs with different bandwidths for the terminal device, flexible scheduling of the terminal device and power saving of the terminal device can be achieved.

(3) Initial (initial) BWP

The initial BWP refers to: when the terminal equipment accesses a cell or a broadband carrier from an RRC-idle state, the terminal equipment initially accesses the BWP. Alternatively, the initial BWP may also be understood as: the bandwidth at the location of the SIB1 indicated by the MIB broadcast in the SSB may be defined as the initial BWP. The terminal device may acquire SIB1, as well as Other System Information (OSI), on the initial BWP and may listen for paging messages.

(4) Activating BWP

When the terminal device has traffic arriving, the network device schedules the terminal device from the initial BWP to a BWP whose bandwidth matches its traffic, which is called active BWP.

According to the current standard, a Physical Downlink Control Channel (PDCCH) common search space (common search space) of Type (Type)0A and Type2 is configured on the active BWP, that is, the terminal device can receive a paging message on the current active BWP.

(5) System Information (SI)

SI may include Minimum System Information (MSI) and Other System Information (OSI).

The OSI may include all SIBs except SIB1, for example, the OSI may include SIB2 to SIB 14. Different SIBs carry different parameters and have different functions. For example, System information related to cell reselection, Public Warning information (PWS), timing (e.g., (global positioning System, GPS) Time, Coordinated Universal Time (UTC) related information, etc.), V2X service (e.g., SL transmission resource pool, SL reception resource pool, SL configuration information, etc.), or positioning may be included. The PWS includes ETWS (Earthquake and Tsunami Warning System) notification or CMAS (public Mobile Alert Service) notification, etc.

The SIB1 may carry scheduling information for other SIBs. For example, a mapping relationship of the SIB to the SI message, a window length of the SI message (e.g., SI-window), a period of the SI message; wherein, the period of the SI message refers to an interval in which the window of each SI message repeatedly appears, that is, an interval in which the window of the same SI message appears twice; the window length of the SI messages refers to the window length of each SI message, and the window lengths of the SI messages under one network device may be the same. The SIB1 may also include configuration information, such as a preamble and/or resource configuration, etc., that indicates whether each SIB is always broadcast or provided on-demand (on-demand), and when system information is requested. The SIB1 may also be referred to as system information block type 1.

It should be noted that the system information in the present invention may be an SI message or an SIB. That is, the system information described hereinafter in the present invention may include an SI message or may also include an SIB.

It should be understood that for a certain terminal, the terminal does not care about all SIBs in OSI, but may only care about some SIBs in OSI, i.e. only about the SIBs associated with itself.

(6) Common search spaces

The common search space may include search spaces for paging, Random Access (RA), SIB1, other si (other si).

If the BWP is not configured with a search space for random access (e.g., there is no ra-SearchSpace), the terminal device cannot receive the MSG2 sent by the network device on the BWP, i.e., cannot acquire the SI message based on the random access procedure. That is, the connected terminal device does not configure a common search space on the BWP, and cannot implement a process of requesting system information (on demand SI) on demand in a random access based manner.

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

If no search space is configured for the other SI on the BWP (e.g., no searchSpaceother Systeminformation), the terminal device cannot receive the other SI broadcast by the network device on the BWP.

If no search space is configured for paging on the BWP (e.g., no pagingSearchSpace), the terminal device cannot receive pages on the BWP.

For the convenience of understanding the embodiment of the present invention, a communication system applicable to the embodiment of the present invention will be described in detail by taking the communication system shown in fig. 1 as an example. Fig. 1 shows a schematic diagram of a communication system suitable for the cell access method of the embodiment of the present invention. As shown in fig. 1, the communication system 100 includes a network device 102 and a terminal 106, where 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 further include the network device 104, and the network device 104 may also be configured with multiple antennas.

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

The network device is a device with a wireless transceiving function or a chip that can be set in the device, and the device includes but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station, a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission point (TRP or transmission point, TP), and may also be 5G, such as NR, a gbb in a system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or may also be a network Node constituting a gbb or transmission point, such as a baseband unit (distributed DU), or a distributed unit (distributed DU).

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 part of the function of the gNB, and the DU implements part of the function of the gNB, for example, the CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) layers, and the DU implements Radio Link Control (RLC), Medium Access Control (MAC) and Physical (PHY) layers. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as RRC layer signaling or PHCP layer signaling, may also be considered to be transmitted by the DU or by the DU + RU under this architecture. It is to be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in the access network RAN, or may be divided into network devices in the core network CN, which is not limited herein.

A terminal 106 can also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal in the embodiment of the present invention may be a mobile phone (mobile phone), a tablet computer (Pad), a smart printer, a train detector, a gas station detector, a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety, a wireless terminal in smart city (smart city), and a wireless terminal in smart home (smart home). The embodiment of the invention does not limit the application scenarios. The terminal 106 and the chip that can be disposed on the terminal 106 are collectively referred to as a terminal in the present invention.

Network device 102 and network device 104 may each communicate with multiple terminals. In one possible implementation, both network device 102 and network device 104 may communicate with terminal 106 shown in the figure. Network device 102 and network device 104 may communicate with any number of terminals similar to terminal 106. It should be understood that the terminal in communication with network device 102 and the terminal in communication with network device 104 may be the same or different. The terminal 106 shown in fig. 1 may communicate with both the network device 102 and the network device 104, but this is merely illustrative of one possible scenario in which the terminal may communicate with only the network device 102 or the network device 104, and the present invention is not limited in this respect.

It should be understood that fig. 1 is a simplified schematic diagram of an example for ease of understanding only, and that other network devices or other terminals, not shown in fig. 1, may also be included in the communication system.

The cell access method provided by the embodiment of the present invention may be executed by a terminal, and the terminal in the following description of the embodiment of the present invention may be the terminal 106 shown in fig. 1, and the network device in the following description may be the network device 102 shown in fig. 1. It should be understood that, in the present invention, the steps performed by the terminal may also be specifically performed by a module or a component of the terminal, such as a chip in the terminal. The following embodiments are described with the terminal as the execution subject.

As shown in fig. 2, a cell access method provided in an embodiment of the present invention is shown, where the method includes:

s201, measuring the signal quality of the current resident cell to obtain a measurement result.

S202, when the measurement result indicates that the signal quality of the cell where the random access network resides does not meet the preset condition, triggering the random access network to switch to the initial BWP for data transmission, and receiving the SIB 1.

In S202, in a possible implementation manner, before triggering the random access to switch to the initial BWP for data transmission, it may further continue to determine whether the currently activated BWP is the initial BWP, if not, trigger the random access to switch to the initial BWP for data transmission, and receive the SIB 1. If the currently active BWP is the initial BWP, the SIB1 is received.

Illustratively, when the terminal is handed over from the LTE cell to the NR cell, the channel quality of the NR cell deteriorates, such as a Signal-to-Noise Ratio (SNR) of the cell is smaller than a set threshold, or the cell that does not meet the cell camping condition (e.g., the camping condition includes successfully reading the system information of the cell and meets the S-criteria for cell selection), and if the currently activated BWP is a non-initial BWP, such as an Additional (Additional) BWP, the terminal is likely to fail to receive the SIB 1. It is therefore necessary to trigger a handover of random access to the initial BWP for data transmission. After that, the terminal initiates random access on the Initial BWP, then the network will correspondingly switch the uplink BWP and the downlink BWP to the Initial BWP, which can ensure the continuity of the received data, and at the same time, switch the currently activated BWP to the Initial BWP for service, and change the BWP will also improve the sending and receiving of the terminal data, because SIB1 contains the scheduling information of other system messages (OSI), then the terminal obtains the neighbor list from the OSI, when the resident cell continues to deteriorate and desynchronize, the terminal can preferentially find the neighbor list obtained from the OSI to be suitable for the cell to initiate registration, and the service can be recovered at the highest speed, so as to provide better experience for the user.

In a possible embodiment, when the terminal performs the above S202, when the measurement result indicates that the signal quality of the currently camped cell does not satisfy the preset condition, even if the currently activated BWP is a non-initial BWP, the terminal may further continue to determine whether SIB1 is included in the currently activated BWP, and if SIB1 is included in the currently activated BWP, the terminal receives SIB 1; if the SIB1 is not included in the currently activated BWP, the random access is triggered to switch to the initial BWP for data transmission and reception of SIB 1.

In another possible embodiment, when the terminal performs the above S202, after determining that the channel quality of the camped cell is degraded, the terminal may further continue to determine whether the network side provides the candidate BWP or the candidate cell, and whether the dedicatedSIB1-Delivery parameter is configured, where the following different situations may exist according to different determination results.

In case a, if the network side does not provide the candidate BWP or the candidate cell, and the dedicatedSIB1-Delivery parameter is not configured, the terminal needs to continuously determine whether the currently activated BWP is not the initial BWP, i.e., execute the above steps S203 to S204.

In case b, if the network side provides the candidate BWP or the candidate cell and configures any one of the dedicatedSIB1-Delivery parameters, the terminal may perform the above steps, i.e. perform the above S202 to S204.

In case c, if the network side does not provide the candidate BWP or the candidate cell, and the dedicatedSIB1-Delivery parameter is not configured, no matter whether the SearchSpaceSIB1 parameter is configured, it still needs to continuously determine whether the currently activated BWP is not the initial BWP, i.e., execute the above-mentioned S203 to S204. Specifically, assuming that the terminal switches NR from LTE, active bwp (firstactbwp) of the terminal is not configured with searchspacsib 1, the terminal does not need to receive SIB1 according to the protocol. (1) If the currently active BWP of the terminal is initiallbwp, the terminal may proactively receive SIB1 and subsequent request (request) OSI with SearchSpaceSib1 configuration information to help the terminal to know the neighboring cell condition and select the optimal cell for the terminal. (2) If the currently activated (active) BWP of the terminal is the Additional (Additional) BWP, ignoring the searchbacesib 1 configuration and normally receiving the SIB1 if the SIB1 is within the activated (active) BWP; if the SIB1 is outside the active BWP, the terminal cannot receive SIB1, and at this time, the terminal actively triggers random access to switch to the Initial BWP to receive SIB1, and meanwhile, it can be ensured that the uplink and downlink DCI are not lost. In another scenario, SearchSpaceSib1 is configured for FirstActBWP after LTE NR handover, and SIB1 is received as required by the protocol terminal. (1) If the currently active BWP is InitialBWP, normally receive SIB 1; (2) if the currently active BWP is additionalbbwp, ignore the searchbace SIB1 configuration and receive SIB1 normally if SIB1 is within the active BWP; if the SIB1 is outside the active BWP, the terminal cannot receive SIB1, and at this time, the terminal actively triggers random access to switch to the Initial BWP to receive SIB1, and meanwhile, it can be ensured that the uplink and downlink DCI are not lost. Therefore, after the terminal is switched to the initial bwp, the terminal receives the SIB1 and obtains the neighbor list from the OSI, the cell continues to deteriorate, and after the NR cell is out of synchronization, the terminal preferentially finds a suitable cell from the neighbor list obtained from the OSI to initiate registration, thereby recovering the service at the highest speed.

Illustratively, in a possible case, when the terminal is handed over from the LTE cell to the NR cell, and the terminal determines that the channel quality of the camped cell is degraded, the network side does not provide the candidate BWP or the candidate cell, and the dedicatedSIB1-Delivery parameter is not configured, if the currently activated BWP is a non-initial BWP, such as an Additional (Additional) BWP, and the terminal is likely to be unable to receive the SIB1, the terminal attempts to transceive data by actively handing over to the initial BWP, and acquires the SIB 1. In another possible case, if the network side is not configured with SearchSpaceSIB1, but the currently activated BWP has the same SCS and CP length as the Initial BWP and Coreset0 is contained in the activated BWP, Coreset0 is 0 and Searchspace0 is 0, so that the PDCCH time-frequency domain position scheduling SIB1 can be determined, and thus SIB1 can be obtained.

In a possible embodiment, when the terminal performs the above S202, after determining that the channel quality of the camped cell is degraded, the terminal may further continue to determine whether the network side provides the candidate BWP or the candidate cell, and whether the dedicatedSIB1-Delivery parameter and the SearchSpaceSIB1 parameter are configured, and if the network side does not provide the candidate BWP or the 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; if the network side provides a candidate BWP or a candidate cell and any one of the configured dedicatedSIB1-Delivery parameters is satisfied, the terminal may receive the SIB 1.

To describe the cell access method more systematically, a flowchart of the method for cell access of the terminal is illustrated below by taking an example that the terminal is handed over from an LTE cell to an NR cell and the signal quality of the NR cell deteriorates, as shown in fig. 3.

S301, after the terminal accesses the NR cell, the measurement of the signal quality is started, and the signal-to-noise ratio is calculated.

S302, judging whether the signal-to-noise ratio is larger than or equal to a set threshold value, whether the network side provides a candidate BWP or a candidate cell and whether a dedicatedSIB1-Delivery parameter is configured, if not, executing S303, otherwise, not processing.

S303, the terminal continuously determines whether the currently activated BWP is the initial BWP, if not, then S304 is executed, otherwise S305 is executed.

S304, the terminal may further continue to determine whether the currently activated BWP includes SIB1, if so, perform S305, otherwise perform S306.

S305, the terminal triggers random access handover to the initial BWP for data transmission, and receives SIB 1.

S306, the terminal actively receives SIB 1.

Based on the steps, the terminal can obtain the neighbor cell list from OSI, when the resident cell is continuously deteriorated and out of step occurs, the terminal can preferentially find the suitable cell from the neighbor cell list obtained from OSI to initiate registration, service is recovered at the highest speed, and better experience is provided for users.

The same concept as that of the above embodiment, the embodiment of the present invention further provides a communication apparatus 400, which is used for implementing the functions of the terminal in the above method. The communication device 400 may be a terminal, or may be a device in a terminal. The apparatus may be a system-on-a-chip. In the embodiment of the present invention, the chip system may be composed of a chip, or may include a chip and other discrete devices. As shown in fig. 4, the communication apparatus 400 includes a measurement unit 401, a determination unit 402, a switching unit 403, and a reception unit 404, wherein:

the measuring unit 401 is configured to measure the signal quality of the currently camped cell to obtain a measurement result.

A determining unit 402, configured to determine whether the signal quality of the currently camped cell indicated by the measurement result meets a preset condition;

a switching unit 403, configured to trigger a random access to be switched to an initial BWP for data transmission when the measurement result indicates that the signal quality of the currently camped cell does not meet a preset condition.

A receiving unit configured to receive a SIB1 on an initial BWP.

In a possible embodiment, the determining unit 402, before triggering the random access to switch to the initial BWP for data transmission, is further configured to: judging whether the currently activated bandwidth part BWP is the initial BWP or not;

the switching unit 403 is specifically configured to: and if the currently activated BWP is not the initial BWP, triggering the random access to be switched to the initial BWP for data transmission.

In a possible embodiment, the switching unit 403 is specifically configured to: if the currently activated BWP is not the initial BWP and the SIB1 is not included in the currently activated BWP, the random access is triggered to switch to the initial BWP for data transmission.

In one possible embodiment, the receiving unit 404 is configured to directly receive the SIB1 if the currently activated BWP is the initial BWP.

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

For the specific implementation and advantageous effects of the above units, reference may be made to the description of the method embodiments in relation to fig. 2 and 3 above.

The division of the modules in the embodiments of the present invention is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present invention may be integrated in one processor, or may exist alone physically, or two or more modules are integrated in one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. As shown in fig. 5, the communication device 500 includes at least one processor 510 and memory 520, as well as a communication interface 530. The memory 520 stores therein a computer program. The memory 520 is coupled to the processor 510. The coupling in the embodiments of the present invention is a spaced coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, and is used for information interaction between the devices, units or modules. As another implementation, the memory 520 may also be located outside of the communication device 500. The processor 510 may operate in conjunction with the memory 520. Processor 510 may invoke computer programs stored in memory 520. At least one of the at least one memory may be included in the processor.

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 blocks disclosed in the embodiments of the present invention. In one possible embodiment, the general purpose processor may be a microprocessor or any conventional processor. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.

In the embodiment of the present invention, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (volatile memory). In one possible implementation, the volatile memory may be random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present invention may also be a circuit or any other device capable of realizing a storage function for storing a computer program and/or data.

The method provided by the embodiment of the present invention may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may 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. The procedures or functions according to the embodiments of the present invention are wholly or partially generated when the computer program is loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium. In one possible embodiment, the computer instructions may be wired from a website, computer, server, or data center. In one possible embodiment, the wired connection may be a coaxial cable, an optical fiber, or a Digital Subscriber Line (DSL), or the computer instructions may be transmitted wirelessly from one website, computer, server, or data center to another website, computer, server, or data center. In one possible embodiment, the wired connection may 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, including one or more media integrated servers, data centers, and the like. In one possible embodiment, the medium may be a magnetic medium, an optical medium, or a semiconductor medium.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the invention. Thus, if such 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 such modifications and variations.

Claims

1. A cell access method applied to a terminal, the method comprising:

measuring the signal quality of the current resident cell to obtain a measurement result;

and when the measurement result indicates that the signal quality of the cell where the current cell resides does not meet the preset condition, triggering the random access to switch to the initial BWP for data transmission, and receiving a system information block SIB 1.

2. The method of claim 1, wherein before triggering the random access handover to the initial BWP for data transmission, further comprising:

judging whether the currently activated bandwidth part BWP is the initial BWP or not;

triggering random access to switch to initial BWP for data transmission, comprising: and if the currently activated BWP is not the initial BWP, triggering the random access to be switched to the initial BWP for data transmission.

3. The method of claim 2, wherein triggering the random access to switch to the initial BWP for data transmission if the currently activated BWP is not the initial BWP comprises:

if the currently activated BWP is not the initial BWP and the SIB1 is not included in the currently activated BWP, the random access is triggered to switch to the initial BWP for data transmission.

4. A method according to claim 2 or 3, characterized in that the method further comprises:

if the currently active BWP is the initial BWP, the SIB1 is received.

5. The method according to any one of claims 1 to 3, wherein the measurement result indicates that the signal quality of the currently camped cell does not satisfy a preset condition, and comprises: the measurement result indicates that the signal-to-noise ratio is less than a set threshold or that the dwell condition is not met.

6. The method according to any one of claims 1 to 3, wherein before measuring the signal quality of the cell in which the current cell resides, the method further comprises:

switching from a cell in a first communication system to the camped cell of a second communication system.

7. A communications apparatus, comprising:

the measuring unit is used for measuring the signal quality of the current resident cell to obtain a measuring result;

the judging unit is used for judging whether the signal quality of the current resident cell indicated by the measuring result meets a preset condition or not;

the switching unit is used for triggering random access to be switched to the initial BWP for data transmission when the measurement result indicates that the signal quality of the cell where the current residence exists does not meet the preset condition;

a receiving unit configured to receive a system information block SIB1 on the initial BWP.

8. The apparatus of claim 7, wherein the determining unit, before triggering the random access handover to the initial BWP for data transmission, is further configured to: judging whether the currently activated bandwidth part BWP is the initial BWP or not;

the switching unit is specifically configured to: and if the currently activated BWP is not the initial BWP, triggering the random access to be switched to the initial BWP for data transmission.

9. The apparatus according to claim 8, wherein the switching unit is specifically configured to: if the currently activated BWP is not the initial BWP and the SIB1 is not included in the currently activated BWP, the random access is triggered to switch to the initial BWP for data transmission.

10. The apparatus of claim 8 or 9, further comprising:

a receiving unit, configured to receive the SIB1 if the currently activated BWP is the initial BWP.

11. The apparatus according to any one of claims 7 to 9, wherein the measurement result indicates that the signal quality of the currently camped cell does not satisfy a preset condition, and the method comprises: the measurement result indicates that the signal-to-noise ratio is less than a set threshold or that the dwell condition is not met.

12. The apparatus according to any of claims 7 to 9, wherein the handover unit, before measuring the signal quality of the currently camped cell, is further configured to:

13. A terminal, comprising: a processor and a memory for storing a computer program; the processor is configured to execute the memory-stored computer program to cause the terminal to perform the method of any of claims 1 to 6.

14. A computer-readable storage medium, having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, carries out the method of any one of claims 1 to 6.