WO2017054134A1 - Procédé et dispositif pour déterminer une ressource de fréquence - Google Patents

Procédé et dispositif pour déterminer une ressource de fréquence Download PDF

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Publication number
WO2017054134A1
WO2017054134A1 PCT/CN2015/091104 CN2015091104W WO2017054134A1 WO 2017054134 A1 WO2017054134 A1 WO 2017054134A1 CN 2015091104 W CN2015091104 W CN 2015091104W WO 2017054134 A1 WO2017054134 A1 WO 2017054134A1
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Prior art keywords
frequency resource
pcid
sequence
sss
information
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PCT/CN2015/091104
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English (en)
Chinese (zh)
Inventor
于光炜
刘铮
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华为技术有限公司
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Priority to CN201580079305.9A priority Critical patent/CN107534913B/zh
Priority to PCT/CN2015/091104 priority patent/WO2017054134A1/fr
Publication of WO2017054134A1 publication Critical patent/WO2017054134A1/fr

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    • 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 present invention relates to the field of mobile communications technologies, and in particular, to a method and apparatus for determining frequency resources.
  • the Internet of Things is the Internet of Things. It extends the client side of the Internet to any item so that information can be exchanged and communicated between any item and item. Such a communication method is also called Machine Type Communications (MTC), and a node for communication is called an MTC terminal.
  • MTC Machine Type Communications
  • Typical Internet of Things applications include smart meter reading, smart home, and more. Because the Internet of Things needs to be applied in a variety of scenarios, from outdoor to indoor, from above ground to underground, there are many special requirements for the design of the Internet of Things: for example, coverage enhancement, support for a large number of low-rate devices, low cost and low energy consumption. Wait.
  • NB-IoT narrowband Internet of Things
  • the NB-IoT solution is a narrowband scheme that can operate on the 200 kHz spectrum.
  • it mainly includes a physical synchronization channel (PSCH) and a physical broadcast channel (PBCH).
  • PSCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the PSCH is a full-band channel.
  • the user equipment User Equipment, UE for short
  • the entire frequency resource is allocated to multiple cells, which causes the UE to not know which frequency resources to read the system broadcast message and the following after synchronizing through the PSCH.
  • the uplink and downlink scheduling and data transmission that is, the UE cannot determine which frequency resource to decode the PBCH after the PSCH transmission, and communicates with the base station through the determined frequency resource.
  • the embodiment of the invention discloses a method and a device for determining a frequency resource, which can quickly and easily acquire a communication frequency resource corresponding to a cell.
  • an embodiment of the present application provides a method for determining a frequency resource, where the method is applicable to a cellular Internet of Things system, including: a UE acquires a PCID and indication information sent by a base station, and then the UE communicates with the base station by using the determined communication frequency resource. .
  • the PCID is used to identify the physical cell to which the UE accesses, and the indication information is used to indicate the communication frequency resource of the UE, and the PCID and the UE are located in the physical cell accessed by the UE identified by the PCID.
  • the communication frequency resource indicating that the UE is located in the physical cell accessed by the UE identified by the PCID may be obtained by the correspondence between the PCID and the communication frequency resource of the UE.
  • the communication frequency resource of the UE may be determined by the correspondence between the PCID and the frequency index of the UE.
  • the communication frequency resource of the UE may be obtained by using the frequency resource allocation information carried by the secondary synchronization signal.
  • the frequency resource allocation information carried by the SSS includes one or more of the following information: for example, different information of a specific location of the SSS, sequence information of the SSS, or the SSS Information about the different locations carried.
  • the frequency resource allocation information carried by the SSS is a frequency index of the communication frequency resource of the UE.
  • it may be obtained by constructing a pilot sequence and a pilot sequence carried by a physical cell accessed by the UE; if the pilot sequence is constructed and carried by a physical cell accessed by the UE The pilot sequence has the strongest correlation, and the communication frequency resource of the UE can be determined.
  • the pilot sequence may be generated by a base sequence that may be determined by the PCID scrambling based on the base sequence or by using the PCID as a sequence generation seed.
  • the base sequence can be: a Gold sequence, a ZC sequence, or an m sequence.
  • an embodiment of the present invention provides a method for determining a frequency resource, where the method is used in a cellular Internet of Things system, including a base station configuring a PCID and indication information, and then the base station sends the PCID and the indication information to the UE.
  • the PCID is used to identify a physical cell to which the UE accesses
  • the indication information is used to indicate a communication frequency resource of the UE, where the UE is located in a physical cell that is accessed by the UE that is identified by the PCID.
  • the communication frequency resource indicating that the UE is located in the physical cell accessed by the UE identified by the PCID may be obtained by the correspondence between the PCID and the communication frequency resource of the UE.
  • the communication frequency resource of the UE may be determined by the correspondence between the PCID and the frequency index of the UE.
  • the communication frequency resource of the UE may be obtained by using the frequency resource allocation information carried by the secondary synchronization signal.
  • the frequency resource allocation information carried by the SSS includes one or more of the following information: for example, different information of a specific location of the SSS, sequence information of the SSS, or information of different locations carried by the SSS.
  • the frequency resource allocation information carried by the SSS is a frequency index of the communication frequency resource of the UE.
  • an embodiment of the present invention provides a UE, where the UE has a function of implementing UE behavior in the foregoing method design.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the modules can be software and/or hardware.
  • the receiver and processor are included in the structure of the UE.
  • the receiver is configured to acquire a PCID and indication information sent by the base station, where the PCID is used to identify a physical cell that is accessed by the UE, and the indication information is used to indicate a communication frequency resource of the UE, where the UE is located in the PCID.
  • the identified physical cell that the UE accesses; the processor is configured to determine, according to the PCID and the indication information, a communication frequency resource of the UE.
  • an embodiment of the present invention provides a base station, which has a function of realizing the behavior of a base station in the actual method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the base station includes a processor and a transmitter.
  • a processor configured to configure a PCID and indication information, where the PCID is used to identify a physical cell that is accessed by the UE, and the indication information is used to indicate a communication frequency resource of the UE, where the UE is located by the PCID a physical cell that is accessed by the UE, and a transmitter, configured to send the PCID and the indication information to the UE.
  • an embodiment of the present invention provides a communication system, where the system includes the base station and the UE in the foregoing aspect; or the system may further include other network entities.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the UE, including a program designed to perform the above aspects.
  • FIG. 1 is a schematic diagram of a possible application scenario of the present invention
  • FIG. 2 is a schematic flow chart of determining a communication frequency resource for implementing the present invention
  • FIG. 3 is a schematic structural diagram of a communication frequency resource for implementing the present invention.
  • FIG. 4 is a schematic flow chart of a communication frequency resource for implementing the present invention.
  • FIG. 5 is a schematic structural diagram of a communication frequency resource for implementing the present invention.
  • FIG. 6 is a schematic flow chart of a communication frequency resource for implementing the present invention.
  • FIG. 7 is a schematic structural diagram of a base station implementing the present invention.
  • FIG. 8 is a schematic structural diagram of a UE implementing the present invention.
  • the network architecture and the service scenario described in the embodiments of the present invention are used to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention.
  • the evolution of the architecture and the emergence of new business scenarios, the present invention The technical solutions provided by the examples are equally applicable to similar technical problems.
  • the user equipment UE to which the present application relates may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, and various forms of user equipment (UE).
  • MS Mobile station
  • terminal terminal
  • user equipment etc.
  • a base station (BS) according to the present invention is a device deployed in a radio access network to provide a wireless communication function for a UE.
  • the base station may include various forms of macro base stations, micro base stations, relay stations, access points, and the like.
  • the name of a device having a base station function may be different.
  • an evolved Node B evolved Node B: eNB or eNodeB
  • Node B In the 3G network, it is called Node B and so on.
  • the above-mentioned devices that provide wireless communication functions for the UE are collectively referred to as a base station or a BS.
  • FIG. 1 is a schematic diagram of an application scenario of an NB-IoT system according to an embodiment of the present invention.
  • the NB-IoT runs at a system bandwidth of 200 kHz.
  • a 10 kHz guard band is set at each end of the frequency, so the actual transmission is performed.
  • the bandwidth is 180kHz.
  • the downlink transmission of the NB-IoT scheme adopts an orthogonal frequency division multiple access (OFDMA) multiple access method.
  • OFDMA orthogonal frequency division multiple access
  • the PSCH occupies all the sub-carriers in the entire NB-IoT frequency band, and actually considers the PSCH guard interval, which does not necessarily occupy all
  • the subcarriers may occupy only the middle 32 subcarriers, such as 120 kHz.
  • all subcarriers or “full band” generally means that the bandwidth of the PSCH is larger than other channels and includes a guard band, and other channels, such as PBCH, PDCCH, or PDSCH. Occupying one-third or less of the frequency resources on the NB-IoT band, thereby achieving a frequency reuse of one-third of the reuse factor. It can effectively reduce the interference between adjacent cells.
  • FIG. 2 is a schematic diagram of a method for determining a frequency resource according to an embodiment of the present invention.
  • the solution provided by the embodiment of the present invention is specifically described below with reference to FIG. 2 .
  • the executor of the method of the embodiment of the present invention relates to a base station and a UE, and the individual base station side or the individual UE side may constitute an independent technical solution.
  • the base station configures a correspondence between a physical cell identity (PCID) and a communication frequency of the UE, and sends an indication of the PCID and the corresponding relationship to the UE.
  • PCID physical cell identity
  • the UE can synchronize the time and frequency with the base station, and can also obtain the PCID of the access cell.
  • the number of PCIDs that can be carried varies according to the capabilities of the information carried by the PSCH. The number of PCIDs must be able to ensure flexibility in network deployment and reduce inter-cell interference.
  • all PCIDs are generally divided into multiple PCID groups, each PCID group contains 3 PCIDs, and each base station is assigned a PCID group, and 3 PCIDs in the PCID group. Three sectors (cells) allocated to this base station. As shown in FIG.
  • N 1 , N 2 , N 3 , and N 4 are allocated to four base stations, where N 1 ⁇ N 2 ⁇ N 3 ⁇ N 4 are integers.
  • N 1 ⁇ N 2 ⁇ N 3 ⁇ N 4 are integers.
  • three sectors (cells) of the same base station are allocated to use three different frequencies, while ensuring that adjacent sectors (cells) use different frequencies.
  • the base station associates a single PCID in the PCID group with the allocated frequency resource, that is, implicit binding, for example, by using the following formula:
  • the implicit binding formula can also be:
  • the frequency resource allocated to the cell accessed by the UE can be obtained through the PCID, and the corresponding relationship can be established in multiple ways, and the corresponding relationship can be expressed in the base station.
  • the form for example, can be a correspondence table, a mapping set, or according to a PCID The operation acquires the corresponding frequency resource and the like.
  • the UE receives the PCID of the UE accessing the cell that is sent by the base station by using the PSCH, and obtains the frequency resource information allocated to the cell accessed by the UE by using the correspondence indication information sent by the base station, and further decodes the PBCH and the PDCCH on the frequency resource. And PDSCH.
  • a feasible alternative is to configure the correspondence relationship for the UE in advance.
  • the UE receives the PCID sent to the UE from the base station, the UE determines the communication frequency resource of the UE according to its pre-configured correspondence.
  • the indication of the correspondence relationship is the communication frequency resource of the PCID configured by the base station and the PCID of the cell accessed by the UE.
  • the UE does not need to perform blind detection after the PSCH network is synchronized. That is, decoding with each multiplexed cell in turn to determine its corresponding communication frequency resource, reducing the complexity of the implementation of the terminal, and simplifying the process of determining the communication frequency resource, thereby reducing the power consumption of the UE.
  • FIG. 4 is another method for determining a frequency resource according to an embodiment of the present invention.
  • the solution provided by the embodiment of the present invention is specifically described below with reference to FIG. 4 .
  • the method in the embodiment of the present invention relates to a base station and a user equipment, and a single base station or a single UE may constitute an independent technical solution.
  • the base station configures a secondary synchronization signal (SSS) structure, and sends the SSS to the UE.
  • SSS secondary synchronization signal
  • the PSCH channel is composed of a primary synchronization signal (PSS) and an SSS.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the following method can be used to indicate the cell communication frequency resource that the UE accesses through the SSS:
  • Method 1 Add information bits carried by the SSS to indicate communication frequency resources corresponding to the cell accessed by the UE.
  • the position is increased by 2 bits of information to indicate.
  • bit information in the idle location in the existing SSS sequence structure may also be used to identify
  • Method 2 Design different SSS locations for different frequency resources, and then obtain the frequency resource information of the bearer by detecting the SSS of different locations by the UE. As shown in FIG. 5, the frequency resources corresponding to the cell accessed by the UE are identified by different locations of the SSS in the PSCH.
  • the frequency resources corresponding to the cell accessed by the UE are represented by different SSS sequences themselves.
  • the foregoing manner is to determine the frequency resource corresponding to the cell that the UE accesses by configuring the structure of the SSS, which is similar to the configuration of the PSS.
  • the structure of the SSS which is similar to the configuration of the PSS.
  • a certain complex sliding related operation is required, which increases the complexity of the UE. Therefore, it is a relatively simple and feasible solution to implement SSS.
  • the UE receives the SSS sent by the base station, and parses the SSS to determine a communication frequency resource corresponding to the cell accessed by the UE.
  • the correspondence between the PCID and the corresponding communication frequency resource of the cell that the UE accesses is indicated by the SSS in the PSCH.
  • various manners have been listed in this embodiment.
  • the embodiments of the present invention are not limited to the enumerated manners, and other manners that can be used to determine the frequency resources corresponding to the cells accessed by the UE by using the SSS are all associated according to the embodiments of the present invention.
  • the SSS is used to determine the frequency resource corresponding to the cell accessed by the UE, and after the coarse frequency offset estimation and the timing synchronization are performed according to the PSS, the SSS is used to solve the information carried by the SSS, including the PCID and the corresponding frequency resource. Information and other information such as frame number information. Reduce the complexity of the implementation of the terminal Sex, but also because it simplifies the process of determining communication frequency resources, reducing the power consumption of the UE.
  • FIG. 6 is another method for determining a frequency resource according to an embodiment of the present invention.
  • the solution provided by the embodiment of the present invention is specifically described below with reference to FIG.
  • the method in the embodiment of the present invention relates to a base station and a user equipment, and a single base station or a separate user equipment may constitute an independent technical solution.
  • the base station sends a PCID to the UE.
  • the UE receives the PCID sent by the base station, and generates a specific pilot sequence of the cell accessed by the UE by using the basic sequence according to the PCID.
  • the channel response is obtained by performing channel estimation before decoding the PBCH, thereby enhancing the decoding performance of the PBCH, PDCCH, and PDSCH by equalization or the like.
  • Channel estimation is done by a known sequence of pilot (reference signals).
  • pilot sequence is transmitted to the entire cell, and the pilot signal is always transmitted regardless of whether there is data transmission, so that the channel estimation and measurement accuracy can be ensured.
  • generating the specific pilot sequence may be obtained by performing PCID scrambling on some basic sequences with good correlation or using different PCIDs as a method of generating seeds.
  • the following is an example of generating a specific pilot sequence by a Gold sequence.
  • the specific pilot sequence is generated by a 31-bit Gold sequence as follows
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the second m sequence is initialized to
  • the generated sequence c(n) is BPSK-modulated according to the allocated physical resource length and mapped to the corresponding physical resource.
  • pilot sequence is only an example, and does not limit the pilot sequence to only use the Gold sequence generation and its generation mode.
  • Other sequences such as ZC sequence or m sequence can also be designed to generate the pilot sequence.
  • the UE matches the generated pilot sequence with the pilot sequence carried on the possible frequency resource allocated by the base station, and determines the frequency resource corresponding to the cell accessed by the UE.
  • the UE obtains the PCID of the cell accessed by the UE through the PSCH network, and performs a correlation operation on the pilot sequence carried on the possible frequency resource by using the specific pilot sequence generated by the PCID, and obtains a correlation peak.
  • the frequency resource corresponding to the highest cell is the frequency resource in which the UE accesses the cell to transmit PBCH, PDCCH, and PDSCH.
  • the UE may determine the frequency resource allocation of the accessed cell by using the specific pilot sequence.
  • the specific pilot sequence has the following characteristics:
  • the pilot sequence has a good correlation so that the bearer's PCID information can be obtained through a cross-correlation operation.
  • the operation complexity can be neglected, and the number of pilot sequences that can be used can satisfy a large number of PCID requirements.
  • the UE performs a correlation operation according to the specific pilot sequence generated by the PCID and the pilot sequence carried on the possible frequency resources configured by the base station, thereby determining the frequency resource corresponding to the UE accessing the cell, compared to the existing frequency resource.
  • the technology reduces the complexity of the implementation of the terminal, and also reduces the power consumption of the UE because the process of determining the communication frequency resource is simplified.
  • each network element such as a UE, a base station, etc.
  • each network element includes hardware structures and/or software modules corresponding to each function.
  • the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is hardware or The manner in which the computer software drives the hardware is performed, depending on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.
  • FIG. 7 shows a possible structural diagram of a base station involved in the above embodiment.
  • the base station includes a transmitter/receiver 1001, a controller/processor 1002, a memory 1003, and a communication unit 1004.
  • the transmitter/receiver 1001 is configured to support the base station to transmit and receive information with the UE in the foregoing embodiment, and to support radio communication between the UE and other UEs.
  • the controller/processor 1002 performs various functions for communicating with the UE.
  • On the uplink the uplink signal from the UE is received via the antenna, coordinated by the receiver 1001, and further processed by the controller/processor 1102 to recover the service data and signaling information transmitted by the UE.
  • traffic data and signaling messages are processed by controller/processor 1002 and mediated by transmitter 1001 to generate downlink signals for transmission to the UE via the antenna.
  • the controller/processor 1002 also performs the processes involved in the base station of Figures 2 through 6 and/or other processes for the techniques described herein.
  • the memory 1003 is used to store program codes and data of the base station.
  • the communication unit 1004 is configured to support the base station to communicate with other network entities.
  • Figure 7 only shows a simplified design of the base station.
  • the base station may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all base stations that can implement the present invention are within the scope of the present invention.
  • Fig. 8 shows a simplified schematic diagram of one possible design structure of the UE involved in the above embodiment.
  • the UE includes a transmitter 1101, a receiver 1102, a controller/processor 1103, a memory 1104, and a modem processor 1105.
  • Transmitter 1101 adjusts (eg, analog conversion, filtering, amplification, upconversion, etc.) the output sample And generating an uplink signal, which is transmitted via an antenna to the base station described in the above embodiment.
  • the antenna receives the downlink signal transmitted by the base station in the above embodiment.
  • Receiver 1102 conditions (eg, filters, amplifies, downconverts, digitizes, etc.) the signals received from the antenna and provides input samples.
  • encoder 1106 receives the traffic data and signaling messages to be transmitted on the uplink and processes (e.g., formats, codes, and interleaves) the traffic data and signaling messages.
  • Modulator 1107 further processes (e.g., symbol maps and modulates) the encoded traffic data and signaling messages and provides output samples.
  • Demodulator 1109 processes (e.g., demodulates) the input samples and provides symbol estimates.
  • the decoder 1108 processes (e.g., deinterleaves and decodes) the symbol estimate and provides decoded data and signaling messages that are sent to the UE.
  • Encoder 1106, modulator 1107, demodulator 1109, and decoder 1108 may be implemented by a composite modem processor 1105. These units are processed according to the radio access technology employed by the radio access network (e.g., access technologies of LTE and other evolved systems).
  • the controller/processor 1103 performs control management on the actions of the UE for performing the processing performed by the UE in the above embodiment. For example, other procedures for controlling the UE to receive paging according to the received DRX long period and/or the techniques described herein. As an example, the controller/processor 1103 is configured to support the UE in performing the processes related to the UE in FIGS. 2-6 and/or other processes for the techniques described herein, the memory 1104 for storing for the UE 110 Program code and data.
  • the modules in the apparatus of the embodiment of the present invention may be combined, divided, and deleted according to actual needs.
  • the controller/processor for performing the above-mentioned base station, UE or core network device function of the present invention may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and an on-site Program gate array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions.
  • the software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in the user equipment.
  • the processor and the storage medium may also reside as discrete components in the user equipment.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

Conformément à des modes de réalisation, la présente invention concerne un procédé et un dispositif pour déterminer une ressource de fréquence. Ledit procédé consiste à acquérir des informations d'indication et une identité de cellule physique envoyées par une station de base, et à déterminer, selon les informations d'indication, une ressource de fréquence à laquelle la cellule correspond. Les informations d'indication peuvent être déterminées de manière spécifique au moyen de la corrélation entre l'identité de cellule physique et la ressource de fréquence à laquelle la cellule correspond ou au moyen d'informations d'attribution de fréquence hébergées par un signal de synchronisation secondaire, etc. La présente invention concerne en outre un dispositif pour mettre en œuvre ledit procédé. Le procédé et le dispositif fournis par la présente invention parviennent à une solution d'acquisition, dans un système de l'Internet des objets à bande étroite (IoT NB), d'une ressource de fréquence à laquelle une cellule correspond, sans augmenter la complexité d'équipement utilisateur.
PCT/CN2015/091104 2015-09-29 2015-09-29 Procédé et dispositif pour déterminer une ressource de fréquence WO2017054134A1 (fr)

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CN201580079305.9A CN107534913B (zh) 2015-09-29 2015-09-29 一种确定频率资源的方法、装置和计算机可读存储介质
PCT/CN2015/091104 WO2017054134A1 (fr) 2015-09-29 2015-09-29 Procédé et dispositif pour déterminer une ressource de fréquence

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CN103858482A (zh) * 2013-06-27 2014-06-11 华为技术有限公司 邻区频点上报、配置方法、装置及系统

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US11290957B2 (en) 2017-11-17 2022-03-29 Samsung Electronics Co., Ltd. Sequence design of wake-up signals and resynchronization sequence
CN108667950A (zh) * 2018-03-23 2018-10-16 海信集团有限公司 一种获取设备标识的方法和设备
CN108667950B (zh) * 2018-03-23 2021-12-21 海信集团有限公司 一种获取设备标识的方法和设备
CN112118080A (zh) * 2019-06-20 2020-12-22 中国移动通信有限公司研究院 系统信息的发送方法、小区的驻留方法、网络设备及终端

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