Cell handover method, electronic device and readable storage medium

Abstract

Embodiments of the present application relate to the field of wireless communication, and disclose a cell switching method, a terminal, a base station, a system and a readable storage medium. In the present application, the cell switching method applied to the terminal comprises: when receiving an indication message for switching a cell from a base station, identifying the indication message; if an adjustment indication is carried in the message, determining a time length that needs to be adjusted; and adjusting a starting sending time of a random access signal after cell switching according to the time length. The above scheme can reduce the probability of step loss and improve the success rate of cell switching.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of wireless communication, in particular to a cell switching method, an electronic device and a readable storage medium. BACKGROUND

[0002] In a wireless communication system, due to the spatial transformation of the terminal or the strength of the signal, the terminal needs to perform cell switching (Channel Switch). Cell switching refers to the movement of a mobile terminal from one cell (referring to a base station or the coverage range of a base station) to another cell. The base station instructs the terminal to perform cell switching. After cell switching, the terminal sends a random access signal (commonly known as message 1, or msg1) to the cell after switching. If the random access signal is successfully received by the base station, the cell switching is completed.

[0003] However, in a complex mobile scenario, the time delay change in spatial propagation caused by short-time movement may exceed the range of the reception detection window, causing an out-of-sync problem after switching. This causes the random access signal to exceed the detection window and not to be accurately received by the base station, thereby causing system abnormalities such as cell switching failure. In a 5G (5th generation mobile networks) wireless communication system, compared with an LTE (Long Term Evolution) system, as the subcarrier spacing in the system becomes larger, the time interval of intra-symbol sampling becomes smaller. Under the premise of fixed CP (Cyclic Prefix) length, the reception detection window of the 5G system becomes very small in the time scale, so the above problem is particularly obvious. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a cell switching method, an electronic device and a readable storage medium, which reduce the probability of out-of-sync occurrence and improve the success rate of cell switching.

[0005] To solve the above technical problems, the embodiments of the present application provide a cell switching method applied to a terminal, comprising: when an indication message for switching a cell from a base station is received, identifying the indication message; if an adjustment indication is carried in the message, determining the time length that needs to be adjusted; and adjusting the starting transmission time of the random access signal after cell switching according to the time length.

[0006] The embodiments of the present application also provide a cell switching method applied to a base station, comprising: when sending an indication message for switching a cell to a terminal, adding an adjustment indication in the message for the receiving end to adjust the starting transmission time of the random access signal after cell switching.

[0007] The embodiment of the present application further provides a terminal, comprising: an analysis module, used for identifying an indication message for switching a cell when the indication message is received from a base station; a delay determination module, used for determining a time length to be adjusted when the indication message carries an adjustment indication; and an adjustment module, used for adjusting a starting sending time of a random access signal according to the time length.

[0008] The embodiment of the present application further provides an electronic device, comprising: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the cell switching method as described above.

[0009] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the cell switching method as described above.

[0010] The embodiment of the present application further provides a cell switching system, comprising: the terminal as described above, and the base station as described above.

[0011] Compared with the prior art, the base station carries an indication for adjusting the sending time of the random access signal when issuing the indication message for switching the cell, so that the terminal can adjust the starting sending time of the random access signal according to the indication, and the time length of the adjustment can be adjusted according to needs, and then the random access signal is sent according to the adjusted starting sending time, thereby increasing the probability of accurately receiving the random access signal and improving the success rate of cell switching. In addition, the terminal sends the random access signal according to the adjusted signal sending time during cell switching, which avoids changing other steps of the switching process and has little influence on the cell switching process, and is easy to be widely promoted.

[0012] As a further improvement, the indication message further comprises a preset field, and the indication for adjusting is determined whether the indication for adjusting is carried in the indication message. The indication for adjusting can be located in the preset field, and the indication for adjusting can be accurately identified.

[0013] As a further improvement, the preset field belongs to an extension field of the indication message. The indication for adjusting can be located in the extension field, and the indication for adjusting can be further accurately identified and has good versatility.

[0014] As a further improvement, the time length to be adjusted is determined according to the following manners: a preset time length is obtained as the time length to be adjusted; or the time length to be adjusted is calculated according to an adjustment parameter configured in the indication for adjusting. Two confirmation methods of the adjustment time length are listed.

[0015] As a further improvement, the required adjustment duration is calculated according to the following formula: N TA_msg1 = (-1) · T D_msg1 · 16 · 64 / 2 μ ; wherein the T D_msg1 is the adjustment parameter, and the μ is determined by the subcarrier spacing configured by the base station. The calculation process of the explicit adjustment duration is facilitated by the formula, which is compatible with the existing protocol.

[0016] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood, and to enable the above and other purposes, features and advantages of the present application to be more apparent, the following specific embodiments of the present application are described in detail in accordance with the contents of the description. BRIEF DESCRIPTION OF DRAWINGS

[0017] One or more embodiments are illustrated by way of example in the drawings in which like reference numerals indicate like elements, and in which:

[0018] Figure 1 is a flowchart of a cell handover method according to a first embodiment of the present application;

[0019] Figure 2 is a flowchart of a cell handover method according to a second embodiment of the present application;

[0020] Figure 3 is a structural schematic diagram of a terminal according to a fourth embodiment of the present application;

[0021] Figure 4 is a schematic diagram of a terminal according to a fifth embodiment of the present application;

[0022] Figure 5 is a schematic diagram of a base station according to a seventh embodiment of the present application;

[0023] Figure 6 is a schematic diagram of a cell handover system according to a ninth embodiment of the present application;

[0024] Figure 7 is a schematic diagram of signal interaction in a cell handover system according to a ninth embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the various embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the various embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the following various embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the present application, and the various embodiments can be combined and referred to each other without contradiction.

[0026] The first embodiment of the present application relates to a cell switching method. The present embodiment is applied to a terminal, which can be a user terminal, a mobile terminal, and specifically can be a mobile phone, a tablet computer (PAD), a watch, an MP3, etc., which will not be listed one by one here. The terminal is often carried by the user during use due to portability, and is very likely to cause spatial changes, thereby requiring to switch the cell accessed by the terminal.

[0027] Taking the mmW system in the 5G wireless communication system as an example, under the configuration of a 400M bandwidth cell with a subcarrier spacing of 120KHz, the CP length on the symbol of non-symbol 0 in the slot is about 586ns, and the electromagnetic wave of this duration can propagate about 175m in the air. In the LTE system, the CP length is 144Ts, about 4687.5ns, and the electromagnetic wave of this duration can propagate about 1406m in the air. It can be seen that the 5G system is more sensitive to time delay changes. Once the scale of the time delay change in space exceeds the detection window range of the system reception, i.e., the signal arrives too early or the signal arrives too late, an abnormality will be caused.

[0028] It is continued to be explained that due to the analog beam, the space is very likely to cause time delay jump during movement because of path change. At the same time, the switching process is relatively easy to cause such abnormality, which is mainly because the system optimizes the timing adjustment of the downlink and uplink before and after switching in order to access the target cell as soon as possible. Taking the terminal side downlink timing as an example, some basically refer to the downlink timing of the source cell and the frame head difference between the two obtained by measurement before switching, thereby directly obtaining the downlink timing relationship of the target cell, and the uplink timing is obtained according to the downlink timing relationship. Then, in a complex scene, the space propagation path may change when sending PRACH Preamble (Physical Random Access Channel Preamble) in the target cell before and after switching, and a proper time delay jump occurs. For PRACH, due to the long CP, it is more likely to cause the problem of signal arriving too early at the receiving side, thereby causing the abnormality of PRACH detection, and then causing the abnormality of the detected PRACH TA to cause subsequent uplink abnormality.

[0029] The flow of the cell switching method in the embodiment is as shown in Figure 1 Specifically as follows:

[0030] Step 101, when receiving the indication message for switching the cell from the base station, the indication message is identified.

[0031] Specifically, the indication message can be the RRC Reconfiguration message (air interface protocol message) initiated by the base station side for switching the cell, in which the msg1TimingDelay field is preset, indicating that the terminal needs to adjust the starting sending time of msg1 (random access signal). Since the RRC Reconfiguration message reserves a plurality of extension fields, the reserved extension field can be predefined as the msg1TimingDelay field in the embodiment, without changing the message format, facilitating the promotion of the embodiment.

[0032] Step 102, it is judged whether the adjustment indication is carried in the message; if yes, step 103 is executed, and if no, step 105 is executed.

[0033] Specifically, the preset field of the message is identified to determine whether the adjustment indication is carried in the indication message. In actual application, the adjustment indication can be carried in other forms, which is not limited herein.

[0034] Step 103, the time length to be adjusted is determined.

[0035] Specifically, the time length to be adjusted is calculated according to the adjustment parameter configured in the adjustment indication, which is specifically calculated by the following formula (1):

[0036] N TA_msg1 = (-1) · T D_msg1 · 16 · 64 / 2 μ ; (1)

[0037] Wherein, the above T D_msg1 is the above adjustment parameter, and μ is determined by the subcarrier spacing configured by the base station. Specifically, the value of the adjustment parameter can be configured according to the network condition, or can be pre-configured by the technician.

[0038] It is worth mentioning that the adjustment parameter is preset in the embodiment, and the time length to be adjusted is calculated according to the value of the adjustment parameter. In actual application, the time length to be adjusted can also be pre-configured, that is, a time length value is preset, and when the time length to be adjusted is determined, the preset time length value is obtained as the time length to be adjusted.

[0039] Step 104, the starting sending time of the random access signal after the cell switching is calculated according to the time length.

[0040] Specifically, taking the 5G wireless communication system as an example, the default timing of the uplink is T TA = (N TA + N TA,offset )T c , and the default adjustment duration for the PRACH Preamble can be regarded as 0, and the value of N TA,offset can be determined according to the protocol. Then, the adjusted starting transmission time is calculated according to the following formula (2):

[0041] T TA_msg1 = (N TA,offset + N TA + N TA_msg1 )T c ; (2)

[0042] According to the out-of-order state, the PRACH Preamble can arrive at the receiving side too early or too late. The adjustment duration calculated according to the preconfigured adjustment parameter is positive, indicating that the PRACH Preamble needs to be delayed, and negative, indicating that the PRACH Preamble needs to be advanced. Subsequent signal transmission, including the processing of the TAC carried by the Msg2 or the TAC carried by the MAC-CE, is processed according to the normal process of the protocol. It can be seen that the integration degree of the present embodiment with the existing cell switching process is high.

[0043] Step 105, when the adjusted starting transmission time arrives, the random access signal is transmitted.

[0044] The above steps 104 to 105 are specifically executed: adjusting the starting transmission time of the random access signal after the cell switching according to the duration.

[0045] Step 106, when the original starting transmission time arrives, the random access signal is transmitted.

[0046] Specifically, when it is determined in step 102 that the adjustment indication is not carried in the message, the above steps 103 and 104 do not need to be executed, and the random access signal can be transmitted according to the starting transmission time agreed in the protocol.

[0047] It can be seen that in the embodiment, when the base station issues the indication message of switching the cell, the indication of adjusting the random access signal sending time is carried, so that the terminal can adjust the starting sending time of the random access signal according to the indication, and the length of the adjustment can be adjusted according to the needs. When the random access signal is sent, it is sent according to the adjusted starting sending time, thereby increasing the probability of accurate reception of the random access signal and improving the success rate of cell switching. In addition, since the terminal side sends the random access signal according to the adjusted signal sending time during cell switching, other steps of the switching process are not changed, and the influence on the cell switching process is small, which is easy to popularize.

[0048] The second embodiment of the application relates to a cell switching method.

[0049] In the embodiment, the 5G system is taken as an example, the subcarrier spacing of the target cell is 120KHz, μ=3, and the adjustment parameter is filled in the preset field of the indication message according to the field analysis, and the value is set to 6. Taking the above conditions as an example, the cell switching method applied to the terminal side is combined with the adjustment of the starting sending time of the random access signal to be sent after the cell switching. Figure 2 are specifically described as follows:

[0050] Step 201, when receiving the indication message for switching the cell from the base station, the indication message is identified.

[0051] Step 202, it is judged whether the adjustment indication is carried in the message; if yes, step 103 is executed, and if no, step 105 is executed.

[0052] Specifically, after receiving the indication message (such as the RRCReconfiguration message), the terminal side parses the adjustment parameter (msg1TimingDelay) with a value of 6 from the preset field (such as ReconfigurationWithSync).

[0053] Step 203, the length of the adjustment is determined.

[0054] Taking the 3GPP protocol as an example, N TA_msg1 = (-1)·T D_msg1 ·16·64 / 2 μ is calculated according to the following formula: T D_msg1 = 6, μ = 3, N TA_msg1 = -768Tc; wherein Tc = 1 / (480KHz*4096), approximately equal to 0.5086263 nanoseconds, which is used as a unit.

[0055] Step 204, the starting sending time of the random access signal after the cell switching is calculated according to the length.

[0056] Specifically, T TA_msg1 =NTA,offset +N TA +N TA_msg1 )T c , the adjusted initial transmission time is calculated, wherein N TA,offset According to the agreement, 13792Tc, then the adjusted initial transmission time T TA_msg1 =(13792+0-768)Tc=13024Tc.

[0057] Step 205, when the adjusted initial transmission time arrives, the random access signal is sent.

[0058] Specifically, according to the initial transmission time calculated in step 204, the terminal sends PRACH Preamble in the target cell according to the downlink timing relationship in advance 13024Tc.

[0059] Step 206, when the original initial transmission time arrives, the random access signal is sent.

[0060] Specifically, when it is determined in step 202 that the adjustment indication is not carried in the message, steps 203 and 204 do not need to be performed, and the random access signal can be sent according to the initial transmission time agreed in the agreement.

[0061] To verify the method in the embodiment, after the cell switching using the method in the embodiment, the terminal can normally receive the subsequent message (such as Msg2 message), which carries the TAC (Timing Advance Command, Timing Advance Command) matching the actual scene. If the method for optimizing TA in the embodiment is not introduced, the originally carried TAC is an abnormal value that does not match the scene. It is observed that the RRC Reconfiguration Complete message can be normally received, the uplink is synchronized after switching, and there is no exception, but when the traditional cell switching method is used, the uplink is abnormal,

[0062] It can be seen that in the embodiment, a specific scene of a 5G system with a target cell subcarrier spacing of 120KHz is taken as an example, and the actual switching effect of the cell switching method in the embodiment is verified. Compared with the existing traditional switching method, the method has the advantages of high switching success rate and low system error rate.

[0063] The third embodiment of the present application relates to a cell switching method.

[0064] The embodiment is applied to a base station, that is, a public mobile communication base station, which is an interface device for mobile equipment to access the Internet and is also a form of radio station, that is, a radio transceiver station for performing information transmission between a mobile communication exchange center and a mobile phone terminal in a certain radio coverage area. The construction of the mobile communication base station is an important part of the investment of the mobile communication operator, and the construction of the mobile communication base station is generally carried out around the factors of coverage, call quality, investment benefit, construction difficulty, and maintenance convenience. With the development of mobile communication network services towards data and packet, the development trend of the mobile communication base station is also broadband, large coverage construction, and IP.

[0065] In the embodiment, when the base station sends an indication message for switching a cell to a terminal, an adjustment indication is added in the message for the receiving end to adjust the starting transmission time of the random access signal after cell switching.

[0066] Specifically, the base station side can decide whether to carry the adjustment flag according to the configuration, carry the adjustment flag in the preset field to indicate that the terminal side needs to adjust the starting transmission time TA of the random access signal, wherein the adjustment indication can carry the adjustment identifier according to the real-time busy condition of the system, indicate the specific adjustment duration, or select a suitable value as the adjustment duration according to experience. After adjustment, the probability of accurate reception of the random access signal is higher, thereby reducing system errors caused by msg1 reception failure.

[0067] It can be seen that the base station side only needs to adjust the adjustment indication in the extension field to adjust the starting transmission time TA of the random access signal of the terminal side, without modifying the format of the signal, facilitating the adaptation of the existing cell switching method and the popularization of the application.

[0068] The step division of the above various methods is only for clear description, and can be combined into one step or split some steps to be decomposed into multiple steps, as long as the same logical relationship is included, and all are within the protection scope of the patent; adding irrelevant modifications or introducing irrelevant designs in the algorithm or flow, but not changing the core design of the algorithm and flow are within the protection scope of the patent.

[0069] The fourth embodiment of the application relates to a terminal, as shown in the formula: Figure 3 The terminal comprises:

[0070] The analysis module is configured to identify the indication message when receiving the indication message for switching a cell from the base station.

[0071] The delay determination module is configured to determine the duration to be adjusted when the adjustment indication is carried in the message.

[0072] The adjusting module is configured to adjust the initial sending time of the random access signal according to the time length.

[0073] The terminal in the embodiment can be a mobile terminal of a user, such as a mobile phone, a tablet computer (PAD), a smart watch (a watch on which an APP can be installed), and the like, and does not need to be listed one by one.

[0074] In one example, the analyzing module is specifically configured to identify a preset field of the indication message, and determine whether the indication is carried in the message.

[0075] In one example, the preset field belongs to an extension field of the indication message.

[0076] In one example, the adjusting module is specifically configured to determine the time length to be adjusted according to the following manners: obtaining a preset time length as the time length to be adjusted; or calculating the time length to be adjusted according to an adjustment parameter configured in the indication.

[0077] In one example, the time length to be adjusted is calculated according to the following formula: N TA_msg1 = (-1) · T D_msg1 · 16 · 64 / 2 μ ; wherein T D_msg1 is the adjustment parameter, and μ is determined by a subcarrier spacing configured by the base station.

[0078] It can be seen that in the embodiment, after receiving the indication message for switching the cell issued by the base station, the terminal first determines whether the indication for adjusting the sending time of the random access signal is carried in the indication message, and if the indication is carried, the terminal can adjust the initial sending time of the random access signal according to the indication, and then sends the random access signal according to the adjusted initial sending time. It can be seen that in the embodiment, the terminal can increase the probability of accurately receiving the random access signal when the cell is switched, and improve the success rate of the cell switching. In addition, since the terminal sends the random access signal according to the adjusted signal sending time when the cell is switched, the other modules used in the switching are not changed, and the influence on the terminal side is small, and the embodiment is easy to be widely promoted.

[0079] A fifth embodiment of the present application relates to a terminal, as shown in the following formula: Figure 4 comprises:

[0080] at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the cell switching method in the first embodiment or the second embodiment.

[0081] The memory and the processor are connected by a bus. The bus can include any number of interconnecting buses and bridges depending on the specific application of the mobile terminal. The bus connects the various circuits of the memory and the processor together and mediates data communication among different components internal to the mobile terminal. By way of these bus and transceiver, the processor can communicate with various peripheral devices and components, such as peripheral device(s), voltage regulators, power management circuitry, and so on; the details of which are not shown in the drawings. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one component or can be more than one component, such as a plurality of receivers and transmitters, which provides means for communicating with various other apparatus over a transmission medium. The data processed by the processor is transmitted over a wireless medium through an antenna, and further, the antenna also receives data and transmits the data to the processor.

[0082] The processor is responsible for managing the bus and general processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory can be used for storing data used by the processor when executing operations.

[0083] The sixth embodiment of the present application relates to a computer readable storage medium storing a computer program. The computer program is executed by a processor to implement the method embodiments in the first embodiment or the second embodiment.

[0084] The seventh embodiment of the present application relates to a base station, as shown in the drawings, comprising: Figure 5

[0085] at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the cell handover method in the third embodiment. The base station in the present embodiment can be a base station in a 5G system, or a base station in other communication systems, which are not listed one by one here.

[0086] The memory and the processor are connected by a bus. The bus can include any number of interconnecting buses and bridges depending on the specific application of the mobile terminal. The bus connects the various circuits of the memory and the processor together and mediates data communication among different components internal to the mobile terminal. By way of these bus and transceiver, the processor can communicate with various peripheral devices and components, such as peripheral device(s), voltage regulators, power management circuitry, and so on; the details of which are not shown in the drawings. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one component or can be more than one component, such as a plurality of receivers and transmitters, which provides means for communicating with various other apparatus over a transmission medium. The data processed by the processor is transmitted over a wireless medium through an antenna, and further, the antenna also receives data and transmits the data to the processor.

[0087] ​The processor is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interface, voltage regulation, power management, and other control functions. The memory can be used to store data used by the processor in performing operations.

[0088] An eighth embodiment of the present application relates to a computer readable storage medium storing a computer program. The computer program is executed by a processor to implement the method embodiment in the third embodiment.

[0089] A ninth embodiment of the present application relates to a cell switching system, as shown in the figure, specifically comprising: a terminal in the fifth embodiment, and a base station in the seventh embodiment. Figure 6

[0090] Further, the signal interaction between the terminal and the base station in the cell switching system in the embodiment can be as shown in the figure, specifically as follows: Figure 7

[0091] Step 701, the base station issues an indication message for switching the cell.

[0092] Step 702, after receiving the indication message, the terminal judges whether the indication message carries an adjustment indication.

[0093] Step 703, the terminal determines the starting sending time of the random access signal.

[0094] Specifically, when the step 702 judges that the indication message carries the adjustment indication, the original starting sending time specified by the protocol is adjusted; when the step 702 judges that the indication message does not carry the adjustment indication, the original starting sending time specified by the protocol is directly obtained.

[0095] Step 704, the terminal sends the random access signal to the base station.

[0096] Specifically, when the terminal timing reaches the starting sending time determined in the step 703, the terminal sends the random access signal to the base station.

[0097] It can be seen that the signal interaction process between the terminal and the base station in the embodiment is basically consistent with the signal interaction of the existing cell switching, and only the adjustment indication information can indicate whether the terminal side adjusts the actual sending time of the random access signal, so that the adjusted starting sending time is more consistent with the actual environment in the communication system, thereby improving the success rate of receiving the random access signal.

[0098] ​​Those of ordinary skill in the art will realize and understand that all or some of the steps in the methods disclosed above and the functional modules / units in the systems and devices can be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be performed by several physical components in cooperation. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, it is common and well understood by those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and can include any information delivery media.

[0099] Those of ordinary skill in the art will realize and understand that the above-described embodiments are specific examples of implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A cell handover method, characterized in that, Applied to terminals, including: When a handover instruction message is received from a base station, a preset field of the instruction message is identified to determine whether the instruction message carries an adjustment instruction, wherein the preset field is an extended field of the instruction message; If the instruction message carries an adjustment instruction, then the duration to be adjusted is determined; Adjust the start time of random access signal transmission after cell handover according to the duration; The duration to be adjusted is determined as follows: Obtain a preset duration as the duration to be adjusted; or, Calculate the required adjustment duration based on the adjustment parameters configured in the adjustment instruction; If the duration to be adjusted is positive, it is determined that the physical random access channel preamble needs to be delayed; if the duration to be adjusted is negative, it is determined that the physical random access channel preamble needs to be advanced.

2. The cell handover method according to claim 1, characterized in that, The required adjustment duration is calculated using the following formula: N TA_msg1 =(-1)·T D_msg1 ·16·64 / 2 μ ; Wherein, the T D_msg1 The adjustment parameter μ is determined by the subcarrier spacing configured by the base station.

3. A cell handover method, characterized in that, Applied to base stations, including: When sending an indication message for cell handover to the terminal, an adjustment indication is added to the message. The receiving end identifies a preset field in the indication message to determine whether the indication message carries an adjustment indication. If the indication message carries an adjustment indication, the duration to be adjusted is determined, and the start transmission time of the random access signal after cell handover is adjusted. The preset field is an extended field of the indication message. The method for determining the duration to be adjusted is: obtaining a preset duration as the duration to be adjusted, or calculating the duration to be adjusted based on the adjustment parameters configured in the adjustment indication. If the duration to be adjusted is positive, it is determined that the physical random access channel preamble needs to be delayed; if the duration to be adjusted is negative, it is determined that the physical random access channel preamble needs to be advanced.

4. A terminal, characterized in that, include: The analysis module is used to identify preset fields of the indication message when it receives an indication message for cell handover from the base station, and determine whether the indication message carries an adjustment indication, wherein the preset fields are extended fields of the indication message; The delay determination module is used to determine the duration to be adjusted when the message carries an adjustment instruction. Specifically, the delay determination module is used to obtain a preset duration as the duration to be adjusted; or, to calculate the duration to be adjusted according to the adjustment parameters configured in the adjustment instruction; if the duration to be adjusted is positive, it is determined that the physical random access channel preamble needs to be delayed; if the duration to be adjusted is negative, it is determined that the physical random access channel preamble needs to be advanced. The adjustment module is used to adjust the start transmission time of the random access signal after cell handover according to the duration.

5. A terminal, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the cell handover method as described in claim 1 or 2.

6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the cell handover method as described in claim 1 or 2.

7. A base station, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the cell handover method as described in claim 3.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the cell handover method of claim 3.

9. A cell handover system, characterized in that, include: The terminal as described in claim 5, and the base station as described in claim 7.

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