WO2021082987A1 - 小区切换方法、电子设备和可读存储介质 - Google Patents

小区切换方法、电子设备和可读存储介质 Download PDF

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Publication number
WO2021082987A1
WO2021082987A1 PCT/CN2020/122210 CN2020122210W WO2021082987A1 WO 2021082987 A1 WO2021082987 A1 WO 2021082987A1 CN 2020122210 W CN2020122210 W CN 2020122210W WO 2021082987 A1 WO2021082987 A1 WO 2021082987A1
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Prior art keywords
cell handover
processor
base station
adjustment
message
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PCT/CN2020/122210
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English (en)
French (fr)
Inventor
陈子福
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中兴通讯股份有限公司
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Publication of WO2021082987A1 publication Critical patent/WO2021082987A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the embodiments of the present invention relate to the field of wireless communication, and particularly relate to a cell handover method, electronic equipment, and a readable storage medium.
  • the terminal needs to perform a cell switch (Channel Switch), which refers to the mobile terminal from a cell (referring to the coverage of a base station or a base station) Move to another cell.
  • the base station instructs the terminal to perform cell handover.
  • the terminal sends a random access signal (commonly known as message 1, or msg1) to the switched cell.
  • the random access signal is successfully received by the base station, and the cell handover is completed.
  • the time delay variation in spatial propagation caused by short-term movement may have exceeded the range of the receiving detection window, causing out-of-synchronization after handover, which will cause the random access signal to exceed the detection window. It is not accurately received by the base station side, resulting in system abnormalities such as cell handover failure.
  • the 5G (5th generation mobile networks) wireless communication system compared to the LTE (Long Term Evolution) system, as the sub-carrier interval becomes larger in the system, the time for single sampling in the symbol The smaller the interval, and under the premise that the length of the CP (Cyclic Prefix) is fixed, the reception detection window of the 5G system becomes very small on the time scale, so the above problem is particularly obvious.
  • the data packet processing method, device, communication device, and storage medium provided by the embodiments of the present invention mainly aim to solve the technical problem at least to a certain extent that the data receiving hardware device can only send the data packet to one CPU core in the multi-core CPU ( Or the number of CPU cores sent is less than the total number of CPU cores), it is impossible to make full use of all the CPU cores, and the data processing performance of the communication equipment is low.
  • the purpose of the embodiments of the present invention is to provide a cell handover method, electronic equipment, and readable storage medium to reduce the probability of out-of-synchronization and improve the success rate of cell handover.
  • the embodiments of the present invention provide a cell handover method, which is applied to a terminal, including: when receiving an indication message for cell handover from a base station, identifying the indication message; if the message carries The adjustment instruction determines the duration to be adjusted; and adjusts the initial transmission time of the random access signal after the cell handover according to the duration.
  • the embodiment of the present invention also provides a cell handover method applied to a base station, including: when sending an indication message for cell handover to a terminal, adding an adjustment indication to the message for the receiving end to adjust the randomness after the cell handover. The start time of the access signal.
  • the embodiment of the present invention also provides a terminal, including: an analysis module, used to identify the indication message from the base station for cell handover, when the indication message is received; a delay determination module, used in the When an adjustment instruction is carried in the message, the duration to be adjusted is determined; the adjustment module is configured to adjust the initial transmission time for sending the random access signal at the initial transmission time according to the duration.
  • the embodiment of the present invention also provides an electronic device, including: at least one processor; and, a memory communicatively connected with the at least one processor; wherein the memory stores the memory that can be executed by the at least one processor; The instructions are executed by the at least one processor, so that the at least one processor can execute the cell handover method as described above.
  • the embodiment of the present invention also provides a computer-readable storage medium storing a computer program, and the computer program is executed by a processor to implement the cell handover method as described above.
  • the embodiment of the present invention also provides a cell handover system, including: the terminal as described above, and the base station as described above.
  • Fig. 1 is a flowchart of a cell handover method according to the first embodiment of the present invention
  • Fig. 2 is a flowchart of a cell handover method according to the second embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a terminal in a fourth embodiment according to the present invention.
  • Fig. 4 is a schematic diagram of a terminal in a fifth embodiment according to the present invention.
  • Fig. 5 is a schematic diagram of a base station in a seventh embodiment according to the present invention.
  • Fig. 6 is a schematic diagram of a cell handover system according to the ninth embodiment of the present invention.
  • Fig. 7 is a schematic diagram of signal interaction in a cell handover system according to a ninth embodiment of the present invention.
  • the first embodiment of the present invention relates to a cell handover method.
  • This embodiment is applied to a terminal.
  • the terminal may be a user terminal, a mobile terminal, and specifically may be a mobile phone, a tablet computer (PAD), a watch, an MP3, etc., which are not listed here.
  • PAD tablet computer
  • MP3 MP3, etc.
  • the CP length on symbols other than symbol 0 in the Slot is about 586 nanoseconds.
  • This duration of electromagnetic waves can be The propagation in the air is about 175 meters.
  • the CP is 144Ts, about 4687.5 nanoseconds. This time electromagnetic wave can propagate in the air for about 1406 meters. It can be seen that the 5G system is more sensitive to delay changes. The scale of the delay change has exceeded the detection window range of the system reception, that is, the signal arrives too early or the signal arrives too late, which will cause anomalies.
  • the space may cause the delay jump due to the path change during the movement.
  • the handover process is relatively prone to such abnormalities.
  • the system optimizes the downlink and uplink timing adjustments before and after the handover in order to access the target cell as soon as possible.
  • the downlink timing on the terminal side Take the downlink timing on the terminal side as an example, some Basically, the downlink timing of the source cell and the frame header difference measured before handover are referenced, so as to directly obtain the downlink timing relationship of the target cell, and the uplink timing is obtained according to the downlink timing relationship.
  • the spatial propagation path may change, and appropriate delay hopping occurs.
  • PRACH Physical Random Access Channel Preamble
  • the CP is very long, it is more likely that the signal arrives at the receiving side prematurely, resulting in abnormal PRACH detection, and then the detected PRACH TA abnormality causes subsequent uplink abnormalities.
  • Step 101 When receiving an instruction message for cell handover from a base station, identify the instruction message.
  • the indication message may be an RRC Reconfiguration message (air interface protocol message) for the base station side to initiate cell handover.
  • the msg1TimingDelay field is preset in the message to indicate that the terminal needs to adjust the initial transmission time of msg1 (random access signal).
  • the RRC Reconfiguration message reserves several extension fields, this embodiment can predefine the reserved extension field as the msg1TimingDelay field without changing the message format, which is convenient for the promotion of this embodiment.
  • step 102 it is determined whether the message carries an adjustment instruction; if so, step 103 is performed, and if not, step 105 is performed.
  • the preset field of the message is identified, and it is determined whether the instruction message carries an adjustment instruction.
  • the adjustment instructions can be carried in other forms, and the carrying form of the adjustment instructions is not limited here.
  • Step 103 Determine the duration to be adjusted.
  • this embodiment calculates the length of time to be adjusted according to the adjustment parameters configured in the adjustment instruction, specifically using the following formula (1) to calculate:
  • N TA_msg1 (-1) ⁇ T D_msg1 ⁇ 16 ⁇ 64/2 ⁇ ; (1)
  • the above-mentioned T D_msg1 is the above-mentioned adjustment parameter, and ⁇ is determined by the subcarrier interval configured by the base station.
  • the value of the adjustment parameter can be configured according to network conditions, or can be pre-configured by a technician.
  • the duration to be adjusted is calculated according to the value of the adjustment parameter.
  • the duration to be adjusted can also be pre-configured, that is, a preset duration value, When the adjustment duration needs to be determined, the preset duration value is obtained as the required adjustment duration.
  • Step 104 Calculate the initial transmission time of the random access signal after the cell handover according to the duration.
  • the default adjustment duration can be regarded as 0, N TA, offset
  • the value of can be agreed according to the agreement. Then calculate the adjusted initial sending time according to the following formula (2):
  • T TA_msg1 (N TA,offset +N TA +N TA_msg1 )T c ;
  • the PRACH Preamble may arrive at the receiving side too early or too late.
  • the adjustment duration calculated according to the pre-configured adjustment parameters if it is positive, indicates that the PRACH Preamble needs to be delayed, if it is negative, It means that you need to PRACH Preamble in advance.
  • Subsequent signal transmission including the processing of the TAC carried by the Msg2 or the TAC carried by the MAC-CE, can be processed in accordance with the normal procedure of the protocol. It can be seen that this embodiment has a high degree of integration with the existing cell handover process.
  • Step 105 Send a random access signal when the adjusted initial sending time arrives.
  • the above steps 104 to 105 are specifically executed: adjusting the initial sending time of the random access signal after the cell handover according to the time length.
  • Step 106 Send a random access signal when the original initial sending time arrives.
  • step 102 when it is determined in step 102 that the message does not carry an adjustment instruction, there is no need to perform the above steps 103 and 104, and the random access signal can be sent according to the initial transmission time agreed in the protocol.
  • the base station carries an instruction to adjust the transmission time of the random access signal when issuing the instruction message for cell handover, so that the terminal can adjust the initial transmission time of the random access signal according to the instruction, and the specific adjustment duration can be based on It needs to be adjusted.
  • the random access signal is sent later, it is sent according to the adjusted initial sending time, thereby increasing the probability that the random access signal is accurately received and improving the success rate of cell handover.
  • the terminal side sends a random access signal according to the adjusted signal sending time, avoiding changing other steps of the handover process, and has little impact on the cell handover process and is easy to be widely promoted.
  • the second embodiment of the present invention relates to a cell handover method.
  • Step 201 When receiving an instruction message for cell handover from a base station, identify the instruction message.
  • step 202 it is determined whether the message carries an adjustment instruction; if so, step 103 is executed, and if not, step 105 is executed.
  • the terminal side parses out the adjustment parameter (msg1TimingDelay) from the preset field (such as ReconfigurationWithSync), and the value is 6.
  • Step 203 Determine the duration to be adjusted.
  • N TA_msg1 (-1) ⁇ T D_msg1 ⁇ 16 ⁇ 64/2 ⁇
  • Step 204 Calculate the initial transmission time of the random access signal after the cell handover according to the duration.
  • T TA_msg1 (N TA,offset +N TA +N TA_msg1 )T c .
  • Step 205 Send a random access signal when the adjusted initial sending time arrives.
  • the terminal sends the PRACH Preamble 13024 Tc ahead of time in the target cell according to the downlink timing relationship.
  • Step 206 When the original initial transmission time arrives, a random access signal is transmitted.
  • step 202 when it is determined in step 202 that the message does not carry an adjustment instruction, there is no need to perform the above steps 203 and 204, and the random access signal can be sent according to the initial transmission time agreed in the protocol.
  • the terminal can normally receive subsequent messages (such as Msg2 messages), which carry TAC (Timing Advance Command) matching the actual scene. If the method for optimizing TA in the embodiment of the present invention is not introduced, the TAC originally carried is an abnormal value that does not match the scene. Later, it was observed that the RRC Reconfiguration Complete message can be received normally, and the uplink synchronization after the handover is not abnormal, but the uplink is abnormal when the traditional cell handover method is used.
  • subsequent messages such as Msg2 messages
  • TAC Tuiming Advance Command
  • the third embodiment of the present invention relates to a cell handover method.
  • the base station is a public mobile communication base station. It is an interface device for mobile devices to access the Internet. It is also a form of radio station. It refers to a certain radio coverage area through a mobile communication switching center. , A radio transceiver station for information transfer with mobile phone terminals.
  • the construction of mobile communication base stations is an important part of the investment of mobile communication operators. The construction of mobile communication base stations is generally carried out around factors such as coverage, call quality, investment benefits, difficulty in construction, and ease of maintenance. With the development of mobile communication network services in the direction of data and packetization, the development trend of mobile communication base stations is bound to be broadband, large coverage construction and IP.
  • an adjustment indication is added to the message for the receiving end to adjust the initial sending time of the random access signal after the cell handover.
  • the base station side can decide whether to carry the adjustment flag according to the configuration.
  • the adjustment flag is carried in the preset field to indicate that the terminal side needs to adjust the initial transmission time TA of the random access signal.
  • the adjustment instruction can be based on the system
  • the real-time busy situation carries an adjustment indicator to indicate the specific adjustment duration, and an appropriate value can also be selected as the adjustment duration based on experience. After adjustment, the probability of the random access signal being accurately received is higher, thereby reducing system errors caused by msg1 reception failure.
  • the base station side only needs to adjust the adjustment indication in the extension field to adjust the initial transmission time TA of the random access signal on the terminal side, without modifying the signal format, which is convenient for adapting to the existing cell switching method, and is convenient for the present invention. Promotion.
  • the fourth embodiment of the present invention relates to a terminal, as shown in FIG. 3, including:
  • the analysis module is used to identify the indication message when the indication message for cell handover from the base station is received.
  • the delay determination module is used to determine the length of time that needs to be adjusted when the adjustment instruction is carried in the message.
  • the adjustment module is used to adjust the initial transmission time of the random access signal according to the duration of the initial transmission time.
  • the terminal in this embodiment may be a user's mobile terminal, such as a mobile phone, a tablet PC, a smart watch (a watch that can install an APP), etc., and will not be listed one by one.
  • a user's mobile terminal such as a mobile phone, a tablet PC, a smart watch (a watch that can install an APP), etc., and will not be listed one by one.
  • the analysis module is specifically configured to identify the preset field of the indication message, and determine whether the message carries an adjustment indication.
  • the preset field belongs to the extended field of the indication message.
  • the adjustment module specifically determines the time length to be adjusted according to the following method: obtaining a preset time length as the time length to be adjusted; or, calculating the time length to be adjusted according to the adjustment parameters configured in the adjustment instruction.
  • the terminal after receiving the indication message for cell handover issued by the base station, the terminal first judges from the indication message whether it carries an indication for adjusting the transmission time of the random access signal. If it is carried, the terminal can follow the indication Adjust the initial transmission time of the random access signal, and then send the random access signal according to the adjusted initial transmission time. It can be seen that the terminal in this embodiment can increase the probability that the random access signal is accurately received during cell handover, and improve the success rate of cell handover. In addition, because during cell handover, the terminal side sends random access signals according to the adjusted signal sending time, avoiding changing other modules used in handover, which has little impact on the terminal side and is easy to be widely promoted.
  • the fifth embodiment of the present invention relates to a terminal, as shown in FIG. 4, including:
  • At least one processor and a memory communicatively connected with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute as described above
  • the cell handover method in the first embodiment or the second embodiment is a cell handover method.
  • the memory and the processor are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects one or more processors and various circuits of the memory together.
  • the bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are all known in the art, and therefore, no further description will be given herein.
  • the bus interface provides an interface between the bus and the transceiver.
  • the transceiver may be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on the transmission medium.
  • the data processed by the processor is transmitted on the wireless medium through the antenna, and further, the antenna also receives the data and transmits the data to the processor.
  • 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 to store data used by the processor when performing operations.
  • the sixth embodiment of the present invention relates to a computer-readable storage medium storing a computer program.
  • the computer program is executed by the processor, the method embodiment in the first embodiment or the second embodiment described above is realized.
  • the seventh embodiment of the present invention relates to a base station, as shown in FIG. 5, including:
  • the base station in this embodiment may be a base station in a 5G system, or a base station in other communication systems, which will not be listed here.
  • the memory and the processor are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects one or more processors and various circuits of the memory together.
  • the bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are all known in the art, and therefore, no further description will be given herein.
  • the bus interface provides an interface between the bus and the transceiver.
  • the transceiver may be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on the transmission medium.
  • the data processed by the processor is transmitted on the wireless medium through the antenna, and further, the antenna also receives the data and transmits the data to the processor.
  • 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 to store data used by the processor when performing operations.
  • the eighth embodiment of the present invention relates to a computer-readable storage medium storing a computer program.
  • the computer program is executed by the processor, the method embodiment in the third embodiment described above is realized.
  • the ninth embodiment of the present invention relates to a cell handover system, as shown in FIG. 6, which specifically includes: a terminal as in the fifth embodiment and a base station as in the seventh embodiment.
  • the signal interaction between the terminal and the base station in the cell handover system in this embodiment may be as shown in FIG. 7, and the details are as follows:
  • Step 701 The base station issues an instruction message for cell handover.
  • Step 702 After receiving the terminal, it determines whether the instruction message carries an adjustment instruction.
  • Step 703 The terminal determines the initial transmission time of the random access signal.
  • step 702 when it is determined in step 702 that it is carried, the original initial sending time specified in the protocol is adjusted; when it is determined in step 702 that it is not carried, the original initial sending time specified in the protocol is directly obtained.
  • Step 704 The terminal sends a random access signal to the base station.
  • the terminal timing when the terminal timing reaches the initial sending time determined in step 703, it sends a random access signal to the base station.
  • the signal interaction process between the terminal and the base station in this embodiment is basically the same as the signal interaction of the existing cell handover. Only adjusting the indication information can indicate whether the terminal side adjusts the actual transmission time of the random access signal, so that the adjusted start The transmission time is more in line with the actual environment in the communication system, thereby increasing the success rate of random access signal reception.
  • the embodiment of the present invention carries an instruction to adjust the transmission time of the random access signal when the base station sends the instruction message for cell handover, so that the terminal can adjust the initial transmission time of the random access signal according to the instruction.
  • the specific adjusted duration can be adjusted as needed.
  • the random access signal is sent later, it is sent according to the adjusted initial sending time, thereby increasing the probability that the random access signal is accurately received and improving the success rate of cell handover.
  • the terminal side sends a random access signal according to the adjusted signal sending time, avoiding changing other steps of the handover process, and has little impact on the cell handover process and is easy to be widely promoted.
  • Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or a non-transitory medium) and a communication medium (or a transitory medium).
  • the term computer storage medium includes volatile and non-volatile data implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Sexual, removable and non-removable media.
  • Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or Any other medium used to store desired information and that can be accessed by a computer.
  • communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media. .

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Abstract

一种小区切换方法、终端、基站、系统和可读存储介质。本发明中，应用于终端的小区切换方法，包括：当接收到来自基站的用于切换小区的指示消息时，识别所述指示消息；若所述消息中携带调整指示，则确定需调整的时长；根据所述时长调整小区切换后的随机接入信号的起始发送时间。

Description

小区切换方法、电子设备和可读存储介质
相关申请的交叉引用
本申请基于申请号为201911042398.4、申请日为2019年10月30日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明实施例涉及无线通信领域，特别涉及小区切换方法、电子设备和可读存储介质。
背景技术
无线通讯系统中，由于终端的空间变换，或者信号的强弱等因素，会使终端需要进行小区切换(Channel Switch)，小区切换指的是移动终端从一个小区(指基站或者基站的覆盖范围)移动到另一个小区。基站指示终端进行小区切换，在小区切换后，终端向切换后的小区发送随机接入信号(俗称消息1，或msg1)，该随机接入信号被基站顺利接收，则完成小区切换。
但是，在复杂的移动场景下，短时间移动带来的空间传播上的时延变化可能已经超过接收检测窗的范围，引起切换后失步问题，这样就造成随机接入信号超出检测窗长，没有被基站侧准确接收，从而造成小区切换失败等的系统异常。5G(5th generation mobile networks，第五代移动通信技术)无线通讯系统中，相比LTE(Long Term Evolution，长期演进)系统来说，系统中随着子载波间隔越大，符号内单采样的时间间隔也越小，在CP(Cyclic Prefix，循环前缀)长度固定的前提下，5G系统的接收检测窗在时间尺度上变得很小，所以上述问题尤为明显。
发明内容
本发明实施例提供的数据包处理方法、装置、通信设备及存储介质，主要旨在至少一定程度上解决的技术问题是数据接收硬件设备只能将数据包送往多核CPU中的一个CPU核心(或是送往的CPU核心数少于CPU的全部核心数)，无法充分利用所有的CPU核心，通信设备的数据处理性能低的问题。
本发明实施方式的目的在于提供一种小区切换方法、电子设备和可读存储介质，降低失步发生概率，提升小区切换成功率。
有鉴于此，本发明的实施方式提供了一种小区切换方法，应用于终端，包括：当接收到来自基站的用于切换小区的指示消息时，识别所述指示消息；若所述消息中携带调整指示，则确定需调整的时长；根据所述时长调整小区切换后的随机接入信号的起始发送时间。
本发明的实施方式还提供了一种小区切换方法，应用于基站，包括：向终端发送用于切换小区的指示消息时，在所述消息中添加调整指示，供接收端调整小区切换后的随机接 入信号的起始发送时间。
本发明的实施方式还提供了一种终端，包括：分析模块，用于当接收到来自基站的用于切换小区的指示消息时，识别所述指示消息；延时确定模块，用于在所述消息中携带调整指示时，确定需调整的时长；调整模块，用于根据所述时长调整所述起始发送时间发送所述随机接入信号的起始发送时间。
本发明的实施方式还提供了一种电子设备，包括：至少一个处理器；以及，与所述至少一个处理器通信连接的存储器；其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如上述的小区切换方法。
本发明的实施方式还提供了一种计算机可读存储介质，存储有计算机程序，所述计算机程序被处理器执行时实现如上述的小区切换方法。
本发明的实施方式还提供了一种小区切换系统，包括：如上述的终端，和，如上述的基站。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，而可依照说明书的内容予以实施，并且为了让本发明的上述和其它目的、特征和优点能够更明显易懂，以下特举本发明的具体实施方式。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是根据本发明第一实施方式中的小区切换方法流程图；
图2是根据本发明第二实施方式中的小区切换方法流程图；
图3是根据本发明第四实施方式中的终端的结构示意图；
图4是根据本发明第五实施方式中的终端的示意图；
图5是根据本发明第七实施方式中的基站的示意图；
图6是根据本发明第九实施方式中的小区切换系统的示意图；
图7是根据本发明第九实施方式中的小区切换系统中信号交互示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合附图对本发明的各实施方式进行详细的阐述。然而，本领域的普通技术人员可以理解，在本发明各实施方式中，为了使读者更好地理解本发明而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本发明所要求保护的技术方案。以下各个实施例的划分是为了描述方便，不应对本发明的具体实现方式构成任何限定，各个实施例在不矛盾的前提下可以相互结合相互引用。
本发明的第一实施方式涉及一种小区切换方法。本实施方式应用于一种终端，终端可以是用户终端、移动终端，具体可以是手机、平板电脑(PAD)、手表、MP3等，在此不再一一列举。终端在使用过程中，由于便携性，常为用户随身携带使用，很容易造成空间上的变化，从而需要切换终端接入的小区。
以5G无线通讯系统中的mmW系统为例，在120KHz的子载波间隔，400M带宽小区配置下，Slot(时隙)内非符号0的符号上CP长度约为586纳秒，该时长电磁波可以在空气中传播约175米左右，而在LTE系统中CP长144Ts，约4687.5纳秒，该时长电磁波可以在空气中传播约1406米，可以看出5G系统对时延变化较为敏感，一旦空间上时延变化的尺度已经超过系统接收的检测窗范围，即信号过早到达或者信号过晚到达，都会造成异常。
继续说明，由于模拟波束的原因，移动过程中空间因为路径变化很有可能导致时延跳变。同时，切换过程是相对较容易出现此类异常的，这主要是因为系统为了能尽快接入目标小区，自行优化了切换前后的下行和上行的定时调整，以终端侧下行定时为例，有的基本参考了源小区时的下行定时以及切换前测量得到的两者的帧头差异，从而直接得到目标小区的下行定时关系，上行定时则是根据下行定时关系获得。然后，在复杂场景下，切换前与切换后在目标小区发送PRACH Preamble(物理随机接入信道前导)时刻，空间传播路径可能发生了变化，出现了适当的时延跳变。对于PRACH，由于CP很长，更可能出现信号过早到达接收侧的问题，从而导致PRACH检测异常的现象，继而导致检测到的PRACH TA异常引起后续上行异常。
本实施方式中的小区切换方法的流程如图1所示，具体如下：
步骤101，当接收到来自基站的用于切换小区的指示消息时，识别指示消息。
具体的说，指示消息可以是基站侧发起切换小区的RRC Reconfiguration消息(空口协议消息)，该消息中预设了msg1TimingDelay字段，指示终端需要对msg1(随机接入信号)调整起始发送时间。其中，由于RRC Reconfiguration消息预留了若干个扩展字段，所以本实施方式可以将预留的扩展字段预定义为msg1TimingDelay字段，无需改变消息格式，便于本实施方式的推广。
步骤102，判断消息中是否携带调整指示；若是，则执行步骤103，若否，则执行步骤105。
具体的说，识别该消息的预设字段，确定指示消息中是否携带调整指示。实际应用中，调整指示可以采用其他形式携带，在此不对调整指示的携带形式进行限定。
步骤103，确定需调整的时长。
具体的说，本实施方式根据调整指示中配置的调整参数，计算需调整的时长，具体利用以下公式(1)计算：
N TA_msg1＝(-1)·T D_msg1·16·64/2 μ； (1)
其中，上述T D_msg1为上述调整参数，μ由基站配置的子载波间隔确定。具体的说，调整参数的值可以根据网络情况配置，也可以由技术人员预先配置。
值得一提的是，本实施方式中预设有调整参数，需调整的时长根据调整参数的值计算，实际应用中，需调整的时长也可以预配置，也就是说，预设一个时长值，在需要确定调整的时长时，获取该预设的时长值作为所需调整的时长。
步骤104，根据时长计算小区切换后的随机接入信号的起始发送时间。
具体的说，以5G无线通讯系统为例，默认上行的定时为T TA＝(N TA+N TA,offset)T c，而对于PRACH Preamble，默认的调整时长可以看作0，N TA,offset的值可以根据协议约定。之后根据以下公式(2)计算出调整后的起始发送时间：
T TA_msg1＝(N TA,offset+N TA+N TA_msg1)T c；  (2)
其中，根据失序状态，PRACH Preamble可能过早到达接收侧，也可能过晚到达接收侧，根据预配置的调整参数计算出的调整时长，如为正，则表示需要延迟PRACH Preamble，如为负，则表示需要提前PRACH Preamble。后续的信号发送，包括Msg2携带的TAC或者MAC-CE携带的TAC的处理都按照协议正常流程处理即可，可见，本实施方式与现有小区切换过程的融合度高。
步骤105，在调整后的起始发送时间到达时，发送随机接入信号。
上述步骤104至步骤105具体执行：根据时长调整小区切换后的随机接入信号的起始发送时间。
步骤106，在原始的起始发送时间到达时，发送随机接入信号。
具体的说，当步骤102中判定消息中未携带调整指示时，则无需执行上述步骤103和104，根据协议中约定的起始发送时间发送随机接入信号即可。
可见，本实施方式中基站在下发切换小区的指示消息时，携带调整随机接入信号发送时间的指示，使得终端可以根据该指示调整随机接入信号的起始发送时间，具体调整的时长可以根据需要调整，之后发送随机接入信号时，根据调整后的起始发送时间发送，从而增加随机接入信号被准确接收的概率，提升小区切换成功率。另外，由于在小区切换时，终端侧根据调整后的信号发送时间发送随机接入信号，避免改变切换过程的其他步骤，对小区切换过程影响较小，易于广泛推广。
本发明的第二实施方式涉及一种小区切换方法。
本实施例中以5G系统，目标小区子载波间隔120KHz，μ＝3，根据现场情况分析，在指示消息的预设字段中填入调整参数，其值设置为6。以上述条件为例，对应用于终端侧的小区切换方法，结合图2进行具体说明：
步骤201，当接收到来自基站的用于切换小区的指示消息时，识别指示消息。
步骤202，判断消息中是否携带调整指示；若是，则执行步骤103，若否，则执行步骤105。
具体的说，终端侧在收到指示消息(如RRCReconfiguration消息)后，从预设字段(如ReconfigurationWithSync)中解析出调整参数(msg1TimingDelay)，值为6。
步骤203，确定需调整的时长。
以采用3GPP协议为例，根据以下公式：N TA_msg1＝(-1)·T D_msg1·16·64/2 μ，公式中，T D_msg1＝6，μ＝3，计算出N TA_msg1＝-768Tc；其中，Tc＝1/(480KHz*4096)，约等于0.5086263纳秒，作为单位使用。
步骤204，根据时长计算小区切换后的随机接入信号的起始发送时间。
具体的说，利用公式T TA_msg1＝(N TA,offset+N TA+N TA_msg1)T c，计算出调整后的起始发送时间，其中，N TA,offset按照协议取13792Tc，则调整后的起始发送时间T TA_msg1＝(13792+0-768)Tc＝13024 Tc。
步骤205，在调整后的起始发送时间到达时，发送随机接入信号。
具体的说，根据步骤204中计算出的起始发送时间，终端在目标小区根据下行定时关系提前13024 Tc发送PRACH Preamble。
步骤206，在原始的起始发送时间到达时，发送随机接入信号。
具体的说，当步骤202中判定消息中未携带调整指示时，则无需执行上述步骤203和204，根据协议中约定的起始发送时间发送随机接入信号即可。
对本实施方式中的方式进行验证，使用本实施方式中的方法进行小区切换后，终端可以正常接收后续消息(如Msg2消息)，携带了与实际场景匹配的TAC(Timing Advance Command，定时提前指令)，如果没有引入本发明实施方式中优化TA的方法，则原先携带的TAC是与场景不匹配的异常值。之后观察到RRC Reconfiguration Complete消息可以正常接收，切换后上行同步，并没有异常，但采用传统的小区切换方法时上行异常，
可见，本实施方式中以一5G系统，目标小区子载波间隔120KHz的具体场景为例，同时，验证了采用本实施方式中小区切换方法的实际切换效果，与现有传统切换方法相比，具有切换成功率高，系统错误率低的优势。
本发明第三实施方式涉及一种小区切换方法。
本实施方式应用于一种基站，基站即公用移动通信基站，是移动设备接入互联网的接口设备，也是无线电台站的一种形式，是指在一定的无线电覆盖区中，通过移动通信交换中心，与移动电话终端之间进行信息传递的无线电收发信电台。移动通信基站的建设是移动通信运营商投资的重要部分，移动通信基站的建设一般都是围绕覆盖面、通话质量、投资效益、建设难易、维护方便等要素进行。随着移动通信网络业务向数据化、分组化方向发展，移动通信基站的发展趋势也必然是宽带化、大覆盖面建设及IP化。
本实施方式中基站向终端发送用于切换小区的指示消息时，在消息中添加调整指示，供接收端调整小区切换后的随机接入信号的起始发送时间。
具体的说，基站侧可以根据配置来决定是否在携带调整标志，在预设字段中携带调整 标志来指示终端侧需要调整随机接入信号的起始发送时间TA，其中，调整指示中可以根据系统实时的繁忙情况携带调整标识，指示具体调整的时长，也可以根据经验选择合适的值作为调整的时长。调整后，随机接入信号被准确接收的概率更高，从而降低由于msg1接收失败造成的系统错误。
可见，基站侧只需调整扩展字段中的调整指示，即可调整终端侧的随机接入信号的起始发送时间TA，无需修改信号的格式，便于适配现有小区切换方法，便于本发明的推广。
上面各种方法的步骤划分，只是为了描述清楚，实现时可以合并为一个步骤或者对某些步骤进行拆分，分解为多个步骤，只要包括相同的逻辑关系，都在本专利的保护范围内；对算法中或者流程中添加无关紧要的修改或者引入无关紧要的设计，但不改变其算法和流程的核心设计都在该专利的保护范围内。
本发明第四实施方式涉及一种终端，如图3所示，包括：
分析模块，用于当接收到来自基站的用于切换小区的指示消息时，识别指示消息。
延时确定模块，用于在消息中携带调整指示时，确定需调整的时长。
调整模块，用于根据时长调整起始发送时间发送随机接入信号的起始发送时间。
本实施方式中的终端可以是用户的可移动终端，如手机、平板电脑PAD、智能手表(可安装APP的手表)等，不再一一列举。
在一个例子中，分析模块具体用于识别指示消息的预设字段，确定消息中是否携带调整指示。
在一个例子中，预设字段属于指示消息的扩展字段。
在一个例子中，调整模块具体根据如下方式确定需调整的时长：获取预设的时长作为需调整的时长；或者，根据调整指示中配置的调整参数，计算需调整的时长。
在一个例子中，根据以下公式计算需调整的时长：N TA_msg1＝(-1)·T D_msg1·16·64/2 μ；其中，T D_msg1为调整参数，μ由基站配置的子载波间隔确定。
可见，本实施方式中终端在接收到基站下发的切换小区的指示消息后，先从指示消息中判断是否携带用于调整随机接入信号发送时间的指示，如果携带，那么终端可以根据该指示调整随机接入信号的起始发送时间，之后发送随机接入信号时，根据调整后的起始发送时间发送。可以看出，本实施方式中的终端在小区切换时，可以增加随机接入信号被准确接收的概率，提升小区切换成功率。另外，由于在小区切换时，终端侧根据调整后的信号发送时间发送随机接入信号，避免改变切换中使用的其他模块，对终端侧影响较小，易于广泛推广。
本发明第五实施方式涉及一种终端，如图4所示，包括：
至少一个处理器；以及，与至少一个处理器通信连接的存储器；其中，存储器存储有可被至少一个处理器执行的指令，指令被至少一个处理器执行，以使至少一个处理器能够执行如上述第一实施方式或第二实施方式中的小区切换方法。
其中，存储器和处理器采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器和存储器的各种电路连接在一起。总线还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路连接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口在总线和收发机之间提供接口。收发机可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器处理的数据通过天线在无线介质上进行传输，进一步，天线还接收数据并将数据传送给处理器。
处理器负责管理总线和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器可以被用于存储处理器在执行操作时所使用的数据。
本发明第六实施方式涉及一种计算机可读存储介质，存储有计算机程序。计算机程序被处理器执行时实现上述第一实施方式或第二实施方式中的方法实施例。
本发明第七实施方式涉及一种基站，如图5所示，包括：
至少一个处理器；以及，与至少一个处理器通信连接的存储器；其中，存储器存储有可被至少一个处理器执行的指令，指令被至少一个处理器执行，以使至少一个处理器能够执行如上述第三实施方式中的小区切换方法。其中，本实施方式中的基站可以是5G系统中的基站，也可以是其他通讯系统中的基站，在此不再一一列举。
其中，存储器和处理器采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器和存储器的各种电路连接在一起。总线还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路连接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口在总线和收发机之间提供接口。收发机可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器处理的数据通过天线在无线介质上进行传输，进一步，天线还接收数据并将数据传送给处理器。
处理器负责管理总线和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器可以被用于存储处理器在执行操作时所使用的数据。
本发明第八实施方式涉及一种计算机可读存储介质，存储有计算机程序。计算机程序被处理器执行时实现上述第三实施方式中的方法实施例。
本发明第九实施方式涉及一种小区切换系统，如图6所示，具体包括：如第五实施方式中的终端，和，如第七实施方式中的基站。
进一步说，本实施方式中小区切换系统中的终端和基站的信号交互可以如图7所示，具体如下：
步骤701，基站下发用于切换小区的指示消息。
步骤702，终端接收后，判断指示消息中是否携带调整指示。
步骤703，终端确定随机接入信号的起始发送时间。
具体的说，当步骤702判定为携带，则调整协议规定的原始起始发送时间；当步骤702判定为未携带，则直接获取协议规定的原始起始发送时间。
步骤704，终端向基站发送随机接入信号。
具体的说，当终端计时到达步骤703中确定的起始发送时间，则向基站发送随机接入信号。
可见，本实施方式中终端和基站的信号交互流程与现有小区切换的信号交互基本一致，仅调整指示信息即可指示终端侧是否调整随机接入信号的其实发送时间，使得调整后的起始发送时间更符合通讯系统中的实际环境，从而提升随机接入信号的接收成功率。
本发明实施方式相对于现有技术而言，基站在下发切换小区的指示消息时，携带调整随机接入信号发送时间的指示，使得终端可以根据该指示调整随机接入信号的起始发送时间，具体调整的时长可以根据需要调整，之后发送随机接入信号时，根据调整后的起始发送时间发送，从而增加随机接入信号被准确接收的概率，提升小区切换成功率。另外，由于在小区切换时，终端侧根据调整后的信号发送时间发送随机接入信号，避免改变切换过程的其他步骤，对小区切换过程影响较小，易于广泛推广。
本领域普通技术人员可以理解，上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些物理组件或所有物理组件可以被实施为由处理器，如中央处理器、数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。这样的软件可以分布在计算机可读介质上，计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的，术语计算机存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于RAM、ROM、EEPROM、闪存或其他存储器技术、CD-ROM、数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。
本领域的普通技术人员可以理解，上述各实施方式是实现本发明的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本发明的精神和范围。

Claims (12)

  1. 一种小区切换方法，应用于终端，包括：
    当接收到来自基站的用于切换小区的指示消息时，识别所述指示消息；
    若所述指示消息中携带调整指示，则确定需调整的时长；
    根据所述时长调整小区切换后的随机接入信号的起始发送时间。
  2. 根据权利要求1所述的小区切换方法，其中，还包括：识别所述指示消息的预设字段，确定所述指示消息中是否携带调整指示。
  3. 根据权利要求2所述的小区切换方法，其中，所述预设字段属于所述指示消息的扩展字段。
  4. 根据权利要求1所述的小区切换方法，其中，根据以下方式确定需调整的时长：
    获取预设的时长作为所述需调整的时长；或者，
    根据所述调整指示中配置的调整参数，计算所述需调整的时长。
  5. 根据权利要求4所述的小区切换方法，其中，根据以下公式计算所述需调整的时长：
    N TA_msg1＝(-1)·T D_msg1·16·64/2 μ；
    其中，所述T D_msg1为所述调整参数，所述μ由所述基站配置的子载波间隔确定。
  6. 一种小区切换方法，应用于基站，包括：
    向终端发送用于切换小区的指示消息时，在所述消息中添加调整指示，供接收端调整小区切换后的随机接入信号的起始发送时间。
  7. 一种终端，包括：
    分析模块，用于当接收到来自基站的用于切换小区的指示消息时，识别所述指示消息；
    延时确定模块，用于在所述消息中携带调整指示时，确定需调整的时长；
    调整模块，用于根据所述时长调整所述起始发送时间发送所述随机接入信号的起始发送时间。
  8. 一种终端，包括：
    至少一个处理器；以及，
    与所述至少一个处理器通信连接的存储器；其中，
    所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如权利要求1至5中任一所述的小区切换方法。
  9. 一种计算机可读存储介质，存储有计算机程序，其中，所述计算机程序被处理器执行时实现权利要求1至5中任一所述的小区切换方法。
  10. 一种基站，包括：
    至少一个处理器；以及，
    与所述至少一个处理器通信连接的存储器；其中，
    所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如权利要求6所述的小区切换方法。
  11. 一种计算机可读存储介质，存储有计算机程序，其中，所述计算机程序被处理器执行时实现权利要求6所述的小区切换方法。
  12. 一种小区切换系统，包括：如权利要求8中所述的终端，和，如权利要求10中所述的基站。
PCT/CN2020/122210 2019-10-30 2020-10-20 小区切换方法、电子设备和可读存储介质 WO2021082987A1 (zh)

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