WO2021027000A1 - 一种系统信息的获取方法、发送方法及装置 - Google Patents

一种系统信息的获取方法、发送方法及装置 Download PDF

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Publication number
WO2021027000A1
WO2021027000A1 PCT/CN2019/105480 CN2019105480W WO2021027000A1 WO 2021027000 A1 WO2021027000 A1 WO 2021027000A1 CN 2019105480 W CN2019105480 W CN 2019105480W WO 2021027000 A1 WO2021027000 A1 WO 2021027000A1
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WIPO (PCT)
Prior art keywords
system information
network device
request message
terminal device
send
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PCT/CN2019/105480
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English (en)
French (fr)
Inventor
陈磊
李秉肇
郭英昊
郝金平
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华为技术有限公司
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Publication of WO2021027000A1 publication Critical patent/WO2021027000A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • This application relates to the field of mobile communication technology, and in particular to a method for obtaining system information, a method for sending it, and a device.
  • system information includes master information block (MIB), system information block 1 (system information block 1, SIB1), other system information blocks except SIB1, and System information block used for positioning.
  • Other system information blocks except SIB1 are also called other system information (OSI), and the system information block used for positioning may be called positioning system information block (posSIB).
  • MIB and SIB1 are necessary system information, and OSI and posSIB are unnecessary system information.
  • OSI and posSIB are transmitted, they are carried on a system information message.
  • One system information message can carry multiple OSIs or multiple posSIBs.
  • the fifth-generation mobile communication technology 5th-generation, 5G
  • necessary system information is periodically broadcast and transmitted, and non-essential system information can be provided to terminal devices based on the needs of specific terminal devices to save system resources.
  • This transmission method It is called on-demand system information (SI).
  • SI on-demand system information
  • the terminal device when the terminal device is performing positioning, it may request the network device to obtain the posSIB, and the network device sends the posSIB to the terminal device based on the request of the UE.
  • the UE may request the network device to obtain the posSIB multiple times during the positioning period, resulting in high transmission resource overhead.
  • This application provides a method, a method and a device for acquiring system information, which are used to save the overhead for terminal equipment to acquire system information.
  • a method for acquiring system information includes: a terminal device sends a first request message to a network device, where the first request message is used to request changed first system information from the network side; then, The terminal device receives the first system information from the network device.
  • the method may be executed by a first communication device, and the first communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip system.
  • the communication device is a terminal device.
  • the first request message may request the network device to send the changed first system information, that is, even if the first system information changes, the terminal device does not need to send a request to the network device again. It can actively send the changed first system information to the terminal device when the first system information changes, thereby reducing the number of requests of the terminal device, reducing the terminal device's overhead for obtaining system information, and reducing the energy consumption of the terminal device .
  • the terminal device does not know whether the system information has changed when sending the first request message.
  • the first request message carries a first duration, wherein the first system information changes within the first duration.
  • the first request message may carry the first duration to instruct the network device to send the first system information that has changed within the first duration to the terminal device. If the first duration exceeds the first duration, the network device can stop sending the message to the terminal. Sending the changed first system information by the device helps to save the overhead of sending the first system information by the network device.
  • the method further includes:
  • the terminal device sends a second request message to the network device, where the second request message is used to instruct the network device to no longer send the changed first system information to the terminal device.
  • the terminal device no longer needs the changed first system information
  • the second request message can be used to instruct the network device to no longer send the changed first system information, which helps to save the network device from targeting the first system The cost of sending information.
  • the first request message carries a first number and first indication information
  • the first number is a number of a system information block
  • the first system information includes the system information block
  • the first indication information is used to instruct the network device to send the changed first system information.
  • the first request message carries a second number and second indication information
  • the second number is a number of a system information message
  • the first system information includes the system information message
  • the second indication information is used to instruct the network device to send the system information message.
  • the first request message may be implemented in multiple ways, for example, a system information block may be requested or a system information message may be requested.
  • the embodiment of the present application does not limit how the first request message is implemented.
  • the method further includes:
  • the terminal device determines the serial number of the system information message according to the first system information.
  • the first request message carries a bit map, and the bit map is used to indicate a system information block or a system information message.
  • the first request message may carry a bit map, so that the system information block and the system information message can be distinguished more clearly through the bit map.
  • the method further includes:
  • the terminal device receives the changed first system information from the network device.
  • the method further includes:
  • the terminal device receives the changed first system information from the network device within the first time period.
  • the terminal device can monitor the changed first system information within the first duration without monitoring the first system information all the time, so that the terminal device can be reduced Energy consumption.
  • the method further includes:
  • the current value of the value tag of the system information block included in the first system information is incremented by one.
  • the network device will inform the terminal device that the value of the value tag of the system information block where the system information that has changed is the first value, so that the terminal device can set the first value when storing the system information block.
  • a value is stored as the value of the value tag of the system information block to ensure that the value indicated by the value tag of the system information block stored by the terminal device matches the content of the system information block.
  • the first system information is used for positioning of the terminal device.
  • the system information can be used for the positioning of the terminal device.
  • the system information is posSIB, so when the posSIB fails, the network device will actively send the changed posSIB to the terminal device, so that the terminal device There is no need to request the network device to obtain the posSIB again, which saves the terminal device the overhead of obtaining the posSIB.
  • the first request message is dedicated signaling.
  • the first request message includes the cell radio network temporary identity of the terminal device.
  • the first request message may carry the cell wireless network temporary identification. Even if the first request message is not dedicated signaling, the network device can know to which terminal device the changed first request message should be sent according to the cell wireless network temporary identification. system message.
  • an embodiment of the present application provides a method for sending system information.
  • the method includes: a network device receives a first request message from a terminal device, and the first request message is used to request a changed first request message from the network side. System information, so that the network device sends the changed first system information to the terminal device when the first system information changes in response to the first request message.
  • the method can be executed by a second communication device.
  • the second communication device can be a terminal or a communication device capable of supporting the terminal to implement the functions required by the method, and of course it can also be another communication device, such as a chip system.
  • the second communication device is a network device.
  • the first request message carries a first duration, wherein the first system information changes within the first duration.
  • the method further includes:
  • the network device receives a second request message from the terminal device, where the second request message is used to instruct the network device to no longer send the changed first system information to the terminal device.
  • the first request message carries a first number and first indication information
  • the first number is a number of a system information block
  • the first system information is included in the system information block
  • the first indication information is used to instruct the network device to send the changed first system information.
  • the first request message carries a second number and second indication information
  • the second number is the number of the system information message
  • the second indication information is used to indicate the network device Send the system information message.
  • the network device in response to the first request message, sends the first system information to the terminal device when the first system information changes, including:
  • the network device sends a system information message corresponding to the second number to the terminal device.
  • the first system information is used for positioning of the terminal device.
  • the method further includes:
  • the method further includes:
  • the network device does not send the changed first system information after the first time period; or,
  • the network device After the first time period, the network device continues to send the changed first system information until the end time of the second time period is reached, wherein the network device receives requests from multiple terminal devices
  • the terminal device is one of the multiple terminal devices, and at least one request message in the multiple request messages carries at least one duration.
  • the second time length belongs to the at least one time length, and the second time length is the time length with the latest end time in the at least one time length.
  • the method further includes:
  • the network device does not send the system information message after the first time period; or,
  • the network device After the first time period, the network device continues to send the changed system information message until the end time of the second time period is reached, wherein the network device receives a request from multiple terminal devices
  • the multiple request messages of the system information the terminal device is one of the multiple terminal devices, at least one request message in the multiple request messages carries at least one duration, the first duration and the
  • the second time length belongs to the at least one time length, and the second time length is the time length with the latest end time in the at least one time length.
  • the first request message is dedicated signaling.
  • the first request message includes the cell radio network temporary identifier C-RNTI of the terminal device.
  • an embodiment of the present application provides a communication device, including a transceiver unit and a processing unit, wherein:
  • the transceiver unit is configured to send a first request message to the network device under the control of the processing unit, and the first request message is used to request changed first system information from the network side;
  • the first system information from the network device is received.
  • the first request message carries a first duration, wherein the first system information changes within the first duration.
  • the transceiver unit is further configured to:
  • the first request message carries a first number and first indication information
  • the first number is a number of a system information block
  • the first system information includes the system information block
  • the The first indication information is used to instruct the network device to send the changed first system information.
  • the first request message carries a second number and second indication information
  • the second number is a number of a system information message
  • the first system information includes the system information message
  • the second indication information is used to instruct the network device to send the system information message.
  • the processing unit is further configured to:
  • the number of the system information message is determined according to the first system information.
  • the transceiver unit is further configured to:
  • the transceiving unit is further configured to: receive a first value from the network device, and the processing unit is further configured to: convert the system information block contained in the first system information The current value of the value label is updated to the first value; or,
  • the processing unit is configured to perform an operation of adding 1 to the current value of the value tag of the system information block included in the first system information.
  • the first system information is used for positioning of the terminal device.
  • the first request message is dedicated signaling.
  • the first request message includes the cell radio network temporary identity of the terminal device.
  • an embodiment of the present application provides a communication device, including a transceiver unit and a processing unit, wherein:
  • the transceiver unit is configured to receive a first request message from a terminal device under the control of the processing unit, the first request message being used to request changed first system information from the network side;
  • the processing unit is configured to control the transceiver unit to send the first system information to the terminal device when the first system information changes in response to the first request message.
  • the first request message carries a first duration, wherein the first system information changes within the first duration.
  • the transceiver unit is further configured to:
  • the first request message carries a first number and first indication information
  • the first number is a number of a system information block
  • the first system information is included in the system information block
  • the first indication information is used to instruct the network device to send the changed first system information.
  • the first request message carries a second number and second indication information
  • the second number is the number of the system information message
  • the second indication information is used to indicate the network device Send the system information message.
  • the processing unit controls the transceiver unit to send the first system information to the terminal device when the first system information changes
  • the processing unit controls the transceiver unit to send the first system information to the terminal device when the first system information changes
  • the processing unit controls the transceiver unit to send a system information message corresponding to the second number to the terminal device.
  • the transceiver unit is further configured to:
  • the first system information is used for positioning of the terminal device.
  • the processing unit is further configured to control the transceiver unit not to send the changed first system information after the first duration; or,
  • the processing unit is further configured to control the transceiver unit to continue to send the changed first system information after the first duration until the end time of the second duration is reached, wherein the transceiver unit receives A plurality of request messages for requesting the system information from a plurality of terminal devices, the terminal device is one of the plurality of terminal devices, and at least one request message in the plurality of request messages carries at least one Time length, the first time length and the second time length belong to the at least one time length, and the second time length is the time length with the latest end moment in the at least one time length.
  • the first request message is dedicated signaling.
  • the first request message includes the cell radio network temporary identity of the terminal device.
  • an embodiment of the present application provides a communication device, which includes a processor, configured to implement the method executed by the terminal device in the first aspect or the network device in the second aspect.
  • the communication device may also include a memory for storing program instructions and data.
  • the memory is coupled with the processor, and the processor can call and execute program instructions stored in the memory to implement any method executed by the terminal device in the first aspect or the network device in the second aspect.
  • the communication device may also include a communication interface, and the communication interface may be a transceiver in the communication device, for example, implemented by the antenna, feeder, and codec in the communication device, or if the fifth type of communication device is set in For a chip in a network device, the communication interface may be an input/output interface of the chip, such as input/output pins.
  • the transceiver is used for the communication device to communicate with other devices. Exemplarily, when the communication device is a terminal device, the other device is a network device; or, when the communication device is a network device, the other device is a terminal device.
  • embodiments of the present application provide a chip system, which includes a processor and may also include a memory, configured to implement the method executed by the terminal device in the first aspect or the network device in the second aspect.
  • the chip system can be composed of chips, or can include chips and other discrete devices.
  • an embodiment of the present application provides a communication system, the system includes the terminal device described in the third aspect and the network device described in the fourth aspect, or includes two communication devices in the fifth aspect, one of which One kind of communication device is used to realize the function of terminal equipment, and the other kind of communication device is used to realize the function of network equipment.
  • the embodiments of the present application also provide a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device in the first aspect or the network device in the second aspect.
  • the embodiments of the present application also provide a computer program product, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device in the first aspect or the network device in the second aspect.
  • FIG. 1 is a schematic diagram of a configuration of a BWP provided by an embodiment of the application
  • FIG. 2 is a schematic diagram of a configuration of a BWP provided by an embodiment of the application.
  • FIG. 3 is a schematic diagram of a terminal device requesting posSIB provided by the prior art
  • FIG. 4 is a schematic diagram of a network architecture provided by an embodiment of the application.
  • FIG. 5 is a schematic flowchart of a method for acquiring and sending system information provided by an embodiment of this application;
  • FIG. 6 is a schematic diagram of a terminal device requesting posSIB according to an embodiment of the application.
  • FIG. 7 is a schematic diagram of a terminal device requesting posSIB according to an embodiment of the application.
  • FIG. 8 is a schematic diagram of a process of positioning a terminal device according to an embodiment of the application.
  • FIG. 9 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 10 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 11 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 12 is a schematic diagram of another structure of a communication device provided by an embodiment of this application.
  • FIG. 13 is a schematic block diagram of another communication device according to an embodiment of this application.
  • FIG. 14 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 15 is a schematic diagram of another structure of another communication device provided by an embodiment of this application.
  • Terminal devices including devices that provide users with voice and/or data connectivity, such as handheld devices with wireless connection functions, or processing devices connected to wireless modems.
  • the terminal device can communicate with the core network via a radio access network (RAN), and exchange voice and/or data with the RAN.
  • RAN radio access network
  • the terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device communication (device-to-device, D2D) terminal equipment, vehicle-to-everything (V2X) Terminal equipment, machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of things (IoT) terminal equipment, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal) , User agent (user agent), or user equipment (user device), etc.
  • UE user equipment
  • UE user equipment
  • V2X vehicle-to-everything
  • M2M/MTC machine-to-machine/machine-type communications
  • IoT Internet of things
  • subscriber unit subscriber unit
  • subscriber station subscriber station
  • mobile station mobile station
  • remote station remote station
  • access point access point
  • it may include mobile phones (or “cellular” phones), computers with mobile terminal equipment, portable, pocket-sized, handheld, and computer-built mobile devices.
  • PCS personal communication service
  • PCS personal communication service
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistants
  • restricted devices such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities. Examples include barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), laser scanners and other information sensing equipment.
  • RFID radio frequency identification
  • GPS global positioning system
  • laser scanners and other information sensing equipment.
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes Wait.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • Use such as various smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.
  • vehicle-mounted terminal equipment for example, the vehicle-mounted terminal equipment is also called on-board unit (OBU).
  • OBU on-board unit
  • Network equipment such as access network (AN) equipment, such as a base station (e.g., access point), may refer to equipment that communicates with wireless terminal equipment through one or more cells on the air interface in the access network
  • AN access network
  • base station e.g., access point
  • IP Internet Protocol
  • the base station can be used to convert received air frames and Internet Protocol (IP) packets into each other, and act as a router between the terminal device and the rest of the access network, where the rest of the access network can include an IP network.
  • IP Internet Protocol
  • the RSU can be a fixed infrastructure entity that supports V2X applications, and can exchange messages with other entities that support V2X applications.
  • the network equipment can also coordinate the attribute management of the air interface.
  • the network equipment may include a long term evolution (LTE) system or an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (advanced, LTE-A) system, Or it can also include the next generation node B (gNB) in the 5G NR system, or it can also include the centralized unit (CU) in the cloud radio access network (Cloud RAN) system. And distributed unit (DU), the embodiment of the present application is not limited.
  • LTE long term evolution
  • NodeB or eNB or e-NodeB, evolutional Node B evolutional Node B
  • LTE-A long term evolution
  • gNB next generation node B
  • CU centralized unit
  • Cloud RAN cloud radio access network
  • DU distributed unit
  • System information includes master information block (MIB), system information block 1 (system information block 1, SIB1), other system information blocks except SIB1, and system information blocks for positioning. Other system information blocks except SIB1 are also called other system information (OSI), and the system information block used for positioning may be called a positioning system information block (posSIB).
  • MIB and SIB1 are necessary system information, and OSI and posSIB are unnecessary system information.
  • OSI and posSIB are transmitted, they are carried on a system information message.
  • One system information message can carry multiple OSIs or multiple posSIBs.
  • posSIB mainly carries auxiliary information required for positioning. Each posSIB will carry information to indicate the effective time of the current posSIB. Since the auxiliary information of terminal device positioning changes rapidly, the effective time of some posSIBs is very short.
  • SI message used to carry SI.
  • One SI message can include one SIB or multiple SIBs.
  • the mapping relationship between SIB and SI messages may be included in SIB1 (for example, in scheduling information).
  • the scheduling information may include the scheduling period (SI-periodicity) and the type of SIB carried (that is, the mapping relationship between SIB and SI messages, etc.).
  • SIB cannot be split and mapped into two different SI messages.
  • one SIB can be carried by one SI message, and for example, one posSIB can be carried by one SI message.
  • the base station broadcasts the SI message and can notify the terminal equipment of the SIB and posSIB.
  • BWP Bandwidth part
  • NR new radio
  • BWP can be a continuous resource in the frequency domain, it can also be called carrier bandwidth part, subband bandwidth, narrowband or narrowband bandwidth, or it can have other names.
  • the name is BWP as an example.
  • a BWP includes continuous K (K>0) subcarriers; or, a BWP is a frequency domain resource where N non-overlapping continuous resource blocks (resource blocks, RB) are located, and the subcarrier spacing of the RB may be 15KHz, 30KHz, 60KHz, 120KHz, 240KHz, 480KHz or other values; or, a BWP is a frequency domain resource where M non-overlapping contiguous resource block groups (RBG) are located, and an RBG includes P(P> 0) A continuous RB, and the subcarrier spacing (SCS) of the RB can be 15KHz, 30KHz, 60KHz, 120KHz, 240KHz, 480KHz or other values, for example, an integer multiple of
  • a BWP is related to a specific system parameter (numerology), and the system parameter includes a subcarrier interval, a cyclic prefix (CP), or a subcarrier interval and CP. Further, the BWP may also be non-contiguous multi-segment resources in the frequency domain.
  • carrier broadband carrier BW
  • only one BWP can be configured for a terminal device, and the bandwidth of the BWP can be less than or equal to the bandwidth capability of the terminal device (UE bandwidth capability).
  • the capability can be less than or equal to the carrier bandwidth (carrier BW).
  • two BWPs can be configured for one terminal device, namely BWP1 and BWP2, and the bandwidths of BWP1 and BWP2 can overlap.
  • two BWPs in the carrier bandwidth, two BWPs can be configured for one terminal device, namely BWP1 and BWP2, and BWP1 and BWP2 may not overlap.
  • the system parameters of BWP1 and BWP2 may be the same system parameter, or may also be different system parameters.
  • the configuration of the BWP (for example, the configuration of the number, location, and/or system parameters of the BWP) may also be other configurations, which are not limited in the embodiment of the present application.
  • BWPs can be divided into two categories, namely Initial BWP and Active BWP.
  • Initial BWP refers to the bandwidth of the location where SIB1 is indicated by the MIB broadcast in the cell-defined synchronization information block (synchronisation signal block, SSB).
  • the UE can obtain SIB1 and other system information (other system information, OSI), and can monitor paging, which is mainly used for terminal devices to initiate random access.
  • Active BWP is mainly used for data service transmission. Generally, when the UE has service arrival, the base station will schedule the terminal equipment from the Initial BWP to a BWP whose bandwidth matches its service.
  • Active BWP is configured with Type 0A and Type 2 physical downlink control channels (physical downlink control channel, PDCCH) common search space (CSS).
  • the terminal device can receive paging and OSI on the current Active BWP.
  • On-demand SI refers to SI sent on-demand.
  • SI sent on-demand.
  • This method can be understood as that, without the request of terminal equipment, network equipment will periodically send through broadcast; the other is to send on demand This can be understood as sending according to the request of the terminal device. For example, in the case that the system information broadcast status configured by the network device for the terminal device is "not broadcast", if the terminal device needs to obtain SI, the terminal device can send a SI acquisition request to the base station, and the network device obtains the SI from the terminal device Request, send the SI requested by the terminal device to the terminal device through broadcast messages or dedicated signaling.
  • the network device can configure at most 4 activated BWPs for the terminal device on each carrier or serving cell.
  • the SI public search space is not necessarily configured for each activated BWP, and only when the SI public search space is configured, the network device will periodically broadcast the SI in the SI public search space. Then for a terminal device, if the active BWP where the terminal device is located is not configured with the SI public search space, the terminal device cannot obtain the SI periodically sent by the network device, but can only obtain the SI in an on-demand manner.
  • the system information broadcasting status is configured by the network equipment to the terminal equipment in advance. If the system information broadcasting status is "not broadcast”, it means that the network equipment will not broadcast SI periodically, so the terminal equipment needs to actively obtain it.
  • the terminal device can generally send a request to the network device during the random access process.
  • the SI acquisition request may be the first message (Msg1), the terminal device may request SI from the network device through Msg1 in the random access process, and the network device may send the SI to the terminal device through broadcast or dedicated signaling.
  • the SI acquisition request may be a third message (Msg3), which may request SI from the network device through Msg3 in the random access process, and the network device may send the SI to the terminal device through broadcast or dedicated signaling.
  • the way that the terminal equipment requests SI from the base station through Msg1 in the random access process can also be called the Msg1 (Msg1based) way
  • the way that the terminal equipment requests SI from the base station through Msg3 during the random access process can also be called Based on Msg3 (Msg3based) method.
  • Msg1 Msg1based
  • Msg3 Msg3based
  • the network device configures a physical random access channel (PRACH) resource dedicated to requesting SI in SIB1, it can be understood as configuring the mapping relationship between PRACH resources and SI.
  • the PRACH resource includes, for example, a random access preamble (preamble), and may also include other resources. Therefore, the terminal device can request the SI from the network device through the PRACH resource configured by the network device. For example, the terminal device sends an SI acquisition request to the network device through Msg1 (it can be understood as sending Msg1 to the base station through the PRACH resource dedicated to requesting SI), that is, the terminal device can acquire SI in Msg1based mode. The terminal device can send Msg1 once, request only one SI, or send Msg1 multiple times to request multiple SIs.
  • Msg1 an SI acquisition request to the network device through Msg1 (it can be understood as sending Msg1 to the base station through the PRACH resource dedicated to requesting SI), that is, the terminal device can acquire SI in Msg1based mode.
  • the network device sends a response message for Msg1 to the terminal device through the second message (Msg2) in the random access process.
  • the Msg2 used to respond to the request for the SI generally only contains a random access preamble identifier (RAPID).
  • RAPID random access preamble identifier
  • Msg1 can be preamble
  • Msg2 can be RAR.
  • the SI acquisition request can be Msg3, that is, the terminal device can request SI through Msg3.
  • the network device can notify the terminal device through SIB1, and the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI.
  • the terminal device does not obtain the information of the PRACH resource dedicated to requesting SI configured by the base station in the received SIB1, and it can determine to request SI through Msg3.
  • on-demand SI is introduced in NR
  • the main idea of the mechanism is that when a terminal device requests a certain SIB, the network device then broadcasts or sends this SIB directly to the terminal device.
  • the specific plan includes:
  • Msg1-based and Msg3-based solutions can be used to request the network to broadcast certain system information.
  • the minimum granularity of the request is an SI message.
  • the network can be requested through dedicated signaling, and then received through dedicated signaling.
  • the minimum granularity of the request can be a SIB or posSIB.
  • SI area In LTE, the system information of each cell is independent, that is, the network equipment will send the system information of each cell to the terminal equipment. After entering a new cell, the terminal device needs to reacquire system information. However, in fact, some system information of different cells may be the same. Therefore, in the NR system, the concept of SI area is introduced. That is, a cell corresponds to an area ID, and each cell broadcasts an area ID. If a SIB is identified as area specific, when the terminal device stores the SIB, it will add the area ID and the current SIB version ( For example, valueTag) and the primary public land mobile network (PLMN) identifier are stored together.
  • SIB the current SIB version
  • PLMN primary public land mobile network
  • the terminal device moves in the same SI area, if the valueTag of the SIB of the new cell and the information stored in the main PLMN and the terminal device are consistent, the terminal device no longer needs to obtain system information again, thus avoiding frequent acquisition by the terminal device System information to save overhead.
  • the value tag of the SIB is used to identify the content version of the SIB.
  • the value tag may be the "systeminfo Value Tag” of the SIB.
  • SIB1 contains the value of "systeminfo Value Tag” for each SIB to identify the content version of the SIB. Whenever the content of SIB changes once, the value indicated by “systeminfo Value Tag” will be incremented by 1. Currently “systeminfo Value Tag” occupies 5 bits and can indicate 0-31 or 32 values. When the value of "systeminfo Value Tag” is 31, if the content of the SIB changes later, the value indicated by “systeminfo Value Tag” will be incremented by 1 and become 0. When the terminal device stores the SIB, it will also store the value of the "systeminfo Value Tag” in SIB1.
  • the terminal device When the network side notifies the system information that there is a change, the terminal device will receive SIB1 again, then obtain the SIB in SIB1, and compare the newly received SIB Whether the value of the "systeminfo Value Tag" of SIB1 is consistent with the value of the previous "systeminfo Value Tag” of SIB1 is used to determine whether the content of the stored SIB has changed.
  • the terminal device determines that the value of the “systeminfo Value Tag” of the newly received SIB1 is the same as the value of the “systeminfo Value Tag” of the previous SIB1, it is determined that the content of the SIB in SIB1 has not changed, and the terminal device does not need to renew Obtain the SIB; on the contrary, if the terminal device determines that the value of the “systeminfo Value Tag” of the newly received SIB1 is different from the value of the “systeminfo Value Tag” of the previous SIB1, it is determined that the content of the SIB in SIB1 has occurred Change, the terminal device needs to obtain the SIB again.
  • the terms “system” and “network” in the embodiments of this application can be used interchangeably.
  • “Multiple” refers to two or more. In view of this, “multiple” may also be understood as “at least two” in the embodiments of the present application.
  • “At least one” can be understood as one or more, for example, one, two or more. For example, including at least one refers to including one, two or more, and does not limit which ones are included. For example, including at least one of A, B, and C, then the included can be A, B, C, A and B, A and C, B and C, or A and B and C.
  • ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, timing, priority, or importance of multiple objects.
  • the terminal device may send an SI acquisition request to the network device to request the network device to acquire posSIB.
  • the network device After the network device receives the SI acquisition request, it can send the posSIB to the terminal device, and the terminal device receives the posSIB, and after the acquired posSIB becomes invalid, it can resend the SI acquisition request to the network device.
  • Figure 3 it is a schematic diagram of the terminal device acquiring posSIB.
  • the terminal device is in the positioning period, at the end of the valid period T of each posSIB (t1, t2, t3, t4, t5), the terminal device can send an SI acquisition request to the network device.
  • the SI acquisition request is used to request posSIB, it can also be called a positioning request message (posSIBs request), as shown in Figure 3 as an example. Since the effective time of the posSIB is relatively short, the terminal device needs to send SI acquisition requests to the network device multiple times during the positioning period to request the acquisition of the posSIB, which results in large transmission resources of the terminal device and consumes more resources and energy consumption.
  • posSIBs request a positioning request message
  • the terminal device may request the network device to directly send the changed first system information to the terminal device during the positioning period, so that the terminal device does not need to request the first system information again after the first system information becomes invalid. .
  • the number of times the terminal device requests the network device to obtain the first system information can be reduced, thereby saving transmission resources and reducing the energy consumption of the terminal device.
  • the technical solutions provided by the embodiments of the present application may be applied to 5G systems, or applied to future communication systems or other similar communication systems.
  • the technical solutions provided by the embodiments of the present application can be applied to a cellular link, a PLMN network, a machine to machine (M2M) network, an Internet of things (IoT) network, or other networks. It can also be applied to links between devices, such as device-to-device (D2D) links.
  • the D2D link can also be called a sidelink, and the side link can also be called a side link or a secondary link.
  • the aforementioned terms all refer to links established between devices of the same type, and have the same meaning.
  • the so-called devices of the same type can be the link between the terminal device and the terminal device, the link between the base station and the base station, and the link between the relay node and the relay node.
  • This application The embodiment does not limit this.
  • D2D links defined by the third generation partnership project (Rel)-12/13 of the third generation partnership project (3GPP), and there are also cars defined by 3GPP for the Internet of Vehicles.
  • V2X link to car, car to cell phone, or car to any entity, including Rel-14/15. It also includes the V2X link based on the NR system of Rel-16 and subsequent versions that are currently being studied by 3GPP.
  • FIG. 4 is an application scenario applied by the embodiment of this application, or a network architecture applied by the embodiment of this application.
  • Figure 4 includes access network equipment and 6 terminal devices.
  • These 6 terminal devices can be cellular phones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs and/ Or any other suitable equipment used for communication on the wireless communication system, and all of them can be connected to the access network equipment.
  • These six terminal devices can all communicate with the access network device.
  • the terminal device may be a narrowband terminal device, such as a mMTC terminal device; the terminal device may be a broadband terminal device, such as an existing release 15 NR terminal device.
  • the number of terminal devices in FIG. 4 is only an example, and it may be less or more.
  • the access network device in Figure 4 may be a base station.
  • the access network equipment corresponds to different equipment in different systems.
  • 4G fourth-generation mobile communication technology
  • eNB eNode B
  • 5G 5th-generation
  • the embodiment of the present application provides a method for acquiring system information. Please refer to FIG. 5, which is a flowchart of the method.
  • the application of this method to the network architecture shown in FIG. 4 is taken as an example.
  • the method can be executed by two communication devices, such as a first communication device and a second communication device, where the first communication device can be a network device or can support the network device to implement the functions required by the method.
  • the communication device or the first communication device may be a terminal device or a communication device (such as a chip system) capable of supporting the terminal device to implement the functions required by the method.
  • the same is true for the second communication device.
  • the second communication device may be a network device or a communication device capable of supporting the functions required by the network device to implement the method, or the second communication device may be a terminal device or capable of supporting the terminal device to implement the method. Communication device with required functions (such as chip system). And there are no restrictions on the implementation of the first communication device and the second communication device.
  • the first communication device may be a network device
  • the second communication device is a terminal device, or both the first communication device and the second communication device are network devices.
  • the device, or the first communication device and the second communication device are both terminal devices, or the first communication device is a network device
  • the second communication device is a communication device capable of supporting the terminal device to implement the functions required by the method, and so on.
  • the network equipment is, for example, a base station.
  • the method is executed by a network device and a terminal device as an example, that is, the first communication device is a terminal device and the second communication device is a network device as an example.
  • the terminal device below may be any one of the six terminal devices in FIG. 4, and the network device below may be the network device in FIG. 4. It should be noted that the embodiments of the present application only take execution through network equipment and terminal equipment as an example, and are not limited to this scenario.
  • S501 The terminal device sends a first request message to the network device, and the network device receives the first request message from the terminal device.
  • the network device In response to the first request message, the network device sends the changed first system information to the terminal device when the first system information changes.
  • the first request message here is used to request the changed first system information on the network side. It can be considered that the terminal device requests the network device to send the changed first system information to the terminal device when the first system information changes. . After the network device receives the first request message, if it is determined that the first system information has changed, it sends the changed first system information to the terminal device.
  • the terminal device When the terminal device sends the first request message to the network device, it does not know whether the first system information has changed. If the first system information changes when the network device receives the first request message, the network device will change The latter first system information is sent to the terminal device. If the first system information has not changed when the network device receives the first request message, the network device waits until the first system information changes, and then sends the changed first system information to the terminal device.
  • the first request message is used by the terminal device to send the network
  • the device requests to obtain the first system information, and requests the network device to send the changed first system information to the terminal device when the first system information changes.
  • the first request message is used for the terminal device to request the network device to send the changed first system information when the first system information changes. For example, when the terminal device is in the idle state, it has acquired the first system information, and then the terminal device enters the connected state. At this time, the first request message can request the network device to send the changed first system information when the first system information changes. information.
  • the first request message may carry an indication information for indicating whether the terminal device needs the changed first system information, or the currently available first system information, and the changed first system information. Therefore, the network device can determine, according to the instruction information, whether the terminal device needs the changed first system information, or the currently available first system information and the changed first system information.
  • the indication information may occupy 1 bit, and the value of the indication information indicates whether the terminal device needs the changed first system information or the currently available first system information , And the first system information after the change.
  • this indication information may be the first system information, and if the first request message carries the first system information, it may indicate that it is used to request the changed first system information. If the first request message does not carry the first system information, it may be used to request the currently available first system information and the changed first system information.
  • the execution of S502 includes the following steps:
  • the network device sends the first system information to the terminal device, so that the terminal device receives the first system information.
  • the network device may send the first system information to the terminal device if it is determined that the terminal device has not acquired the first system information.
  • the network device determines that the first system information has changed.
  • the network device After the network device sends the first system information to the terminal device, it can determine whether the first system information has changed, so as to send the changed first system information to the terminal device after the first system information changes.
  • the network device sends the changed first system information to the terminal device, so that the terminal device receives the changed first system information.
  • the network device determines that the first system information has changed, and then sends the changed first system information to the terminal device.
  • the network device may not send the current first system information to the terminal device, but when the current first system information changes , Before sending the changed first system information to the terminal device. Therefore, S5021 is not necessary in the embodiment of the present application, so it is illustrated by a dotted line in FIG. 5.
  • the terminal device when the terminal device needs to obtain the first system information, and the system information broadcast state configured by the network device for the terminal device is "not broadcast", the terminal device may send the first request message to the network device, To obtain the first system information.
  • the network equipment can configure up to 4 activated BWPs for the terminal equipment on each carrier or serving cell.
  • the activated BWP where the terminal device is located is not configured with the system information CSS, the terminal device cannot obtain the system information periodically sent by the network device, but can only obtain system information on demand, so the terminal device can send to the network device The first request message.
  • the first request message may be Msg1 in the random access process, that is, the terminal device may obtain the first system information in the Msg1based manner.
  • the terminal device requests the first system information from the network device through Msg1 in the random access process, and the network device may send the changed first system information to the terminal device through dedicated signaling.
  • the network device is configured with PRACH resources dedicated to requesting SI, which can be understood as configuring the mapping relationship between PRACH resources and SI.
  • the PRACH resource includes, for example, a preamble, and may also include other resources.
  • the terminal device sends Msg1 once, and can request only one SI or multiple SIs.
  • PRACH resource 1 corresponds to SI#1
  • PRACH resource 2 corresponds to SI#2 and SI#3. Then, if the terminal device uses PRACH resource 1 when sending Msg1, it indicates that the terminal device requests SI#1, and if the terminal device uses PRACH resource 2 when sending Msg1, it indicates that the terminal device requests SI #2 and SI#3.
  • the terminal device only needs to select the corresponding PRACH resource according to the SI to be requested.
  • the terminal device can request SI through Msg3, that is, the first request message may be Msg3.
  • the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI
  • it can inform the terminal device through SIB1 that the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI.
  • the terminal device does not obtain the information of the PRACH resource dedicated to requesting SI configured by the network device in the received SIB1, and it can be determined to request the first system information through Msg3.
  • the first request message may be radio resource control (Radio Resource Control, RRC) signaling, that is, the terminal device may obtain the first system information from the network device through RRC signaling.
  • RRC Radio Resource Control
  • the network device may also send the first system information to the terminal device through RRC signaling.
  • the implementation of the first request message through Msg1, Msg3, or RRC signaling is only an example, and the embodiment of this application does not limit other implementations of the first request message.
  • the first request message may also be implemented through newly added signaling. achieve.
  • the first request message is used to instruct the network device to send the changed first system information to the terminal device, and there may be several implementation manners.
  • the first request message may carry the first number and the first indication information.
  • the first number is the number of the system information block, and the first system information to be acquired by the terminal device includes the system information block.
  • the terminal device requests to obtain SIB2 from the network device, and the first number may be the number of SIB2.
  • the first number is the number of the first system information message, and the first system information to be acquired by the terminal device is the first system information message indicated by the first number.
  • the terminal device requests to obtain posSIB from the network device, then the first number may be the number of posSIB.
  • the first indication information may be used to instruct the network device to send the changed first system information when the first system information changes.
  • the first indication information may be carried in a field of the first request message.
  • the first indication information may be carried in a field of RRC signaling, which may be a newly added field of RRC signaling, or it may be original RRC signaling. Field.
  • the first indication information can occupy 1 bit. When the value of the first indication information is "0", it can instruct the network device to send the changed first system information when the first system information changes; accordingly When the value of the first indication information is "1", it can instruct the network device to send the current first system information, or instruct the network device not to send the first system information.
  • the value of the first indication information when the value of the first indication information is "1", it may instruct the network device to send the changed first system information when the first system information changes; accordingly, when the first indication information The value of is "0", which can instruct the network device to send the current first system information, or instruct the network device not to send the first system information.
  • the value of the first indication information may also be understood as the value carried by the first field in some embodiments.
  • the first request message is Msg3
  • the first indication information may be carried in the common control channel.
  • the first request message may be a message for requesting an SI message.
  • a terminal device may request SIB1 from a network device by requesting an SI message containing SIB1 from the network device.
  • the first request message may carry the second number and the second indication information.
  • the second number is the number of the system information message.
  • the network device After receiving the first request message, the network device sends the SI message corresponding to the second number to the terminal device. For example, if the network device configures the CSS for the terminal device, the network device can broadcast SI messages.
  • One SI message may include multiple SIBs, and different SI messages may include different SIBs.
  • SI message 1 includes SIB2 and SIB3; SI message 2 includes SIB2, SIB4, and SIB5. If terminal device 1 needs to acquire SIB4, terminal device 2 needs to acquire SIB2.
  • the network device broadcasts the SI message 2, and the terminal device 1 receives the SI message 2 and can obtain the required SIB4 from it; the terminal device 2 receives the SI message 2 and can obtain the required SIB2 from it.
  • the network device does not need to separately send the first system information for the terminal device 1 and the terminal device 2, thereby saving the cost of the network device.
  • the second indication information is similar to the above-mentioned first indication information, and will not be repeated here.
  • the first request message may carry the aforementioned second number.
  • the first system information required by different terminal devices may be different, so the second number carried in the corresponding first request message is also different.
  • the SI message broadcast at the same time may include the first system information required by a certain terminal device, but may not include the first system information required by a certain terminal device. If the terminal device reads the SI message broadcast by the network device every time, it is obvious that some of the obtained SI messages are useless. For this reason, when a network device broadcasts an SI message, it can broadcast which SIBs the SI message includes, and the sending location information of the SI message, so that the terminal device can read the corresponding SI message according to its own needs to save transmission resource overhead.
  • the first request message may also carry a bitmap, and the bitmap may be used to indicate whether the first request message requests a system information block or a system information message.
  • the first request message may carry the first number and bitmap, or the first request message may carry the second number and bitmap.
  • the bitmap occupies 1 bit. When the value of the 1 bit is "0", the first request message requests a system information block. Correspondingly, when the value of the 1 bit is "1", the first request message requests an SI message Or, in some embodiments, when the value of the 1bit is "1", the first request message requests a system information block, and correspondingly, when the value of the 1bit is "0", the first request message requests Is the SI message.
  • the bitmap is used to more clearly inform the network device whether the terminal device requests a system information block or an SI message.
  • the first request message may not carry the first number or the second number. If the first request message does not carry the first number or the second number, the first number or the second number may be agreed in advance. For example, it is agreed in advance that the first number is X and the second number is Y, and the network device receives the first number. If the first request message carries a bitmap, the system information block corresponding to X may be sent to the terminal device according to the value of the bitmap, or the network device may send the SI message corresponding to Y to the terminal device according to the value of the bitmap.
  • the above-mentioned first and second methods can be considered as explicit instructions.
  • the first request message in this application can also implicitly instruct the network device to send when the first system information changes.
  • the message type of the first request message may be newly defined. Assume that the message type of the first request message is type X, which is different from the message type of Msg1 above, and type X indicates that the terminal device requests that the network device changes in the first system information At this time, the changed first system information is sent to the terminal device.
  • Msg1 indicates that the terminal device requests the first system information from the network device without requesting the network device to actively send the changed first system information to the terminal device.
  • the network device determines that the message type of the first request message is type X, it is determined that the terminal device requests the network device to send the changed first system information to the terminal device when the first system information changes. If the network device determines that the first request message is Msg1, that is, the message type is not type X, it determines that the terminal device requests the first system information from the network device without requesting the network device to actively send the changed first system information to the terminal device. For another example, this application may newly add signaling, which is used to instruct the network device to send the changed first system information when the first system information changes. Wherein, the above type X is only to illustrate that the message type of the first request message can be a newly added type, and "X" does not have a referential effect.
  • the terminal device can determine that the first request message requests an SI message, that is, the first request message contains one or more SI Message information. If the terminal device determines that the activated BWP where the terminal device is located is the configured system information CSS, the terminal device can determine that the first request message requests SIB, that is, the first request message contains information about one or more SIBs.
  • the network device may also send a first value to the terminal device.
  • the first value may be the value of the value tag of the SIB contained in the first system information. Value.
  • the value tag of the SIB may be the "systeminfo Value Tag” field of the SIB, and the first value may be the value indicated by the "systeminfo Value Tag” field of the SIB.
  • the network device when the network device sends the changed SIB to the terminal device, it can set the value indicated by the "systeminfo Value Tag" of the changed SIB, for example, the first value The value is sent to the terminal device.
  • the network device when the network device broadcasts the SI message to the terminal device, it may include the "systeminfo Value Tag" of one or more SIBs included in the SI message. The values are respectively sent or broadcast to the terminal equipment.
  • the terminal device may store the changed SIB according to the first value. That is, the terminal device stores the changed SIB, and can also update the current value of the SIB "systeminfo Value Tag” to the first value, and store the first value to ensure that the terminal device stores the SIB "systeminfo” The value indicated by Value Tag" matches the content of the SIB.
  • the terminal device after the terminal device obtains the SIB from the network device, it can add 1 to the current value of the "systeminfo Value Tag" of the corresponding SIB; or, after the terminal device obtains the SI message from the network device, The current value of the "systeminfo Value Tag" of the SIB requested by the terminal device included in the SI message may be incremented by one to obtain the new value of the "systeminfo Value Tag” of the SIB, such as the first value.
  • the terminal device may store the changed SIB according to the first value to ensure that the value indicated by the "systeminfo Value Tag" of the SIB stored by the terminal device matches the content of the SIB.
  • the network device sending the first value to the terminal device is not restricted by the terminal device sending the first request message. That is, the network device may send the first value to the terminal device based on the first request message sent by the terminal device to the network device, or may also send the first value to the terminal device based on other possible situations.
  • the network device may simultaneously send the changed system information and the first value to the terminal device, or the network device may also send the changed system information and the first value to the terminal device respectively.
  • the first request message may also include a cell-radio network temporary identifier (C-RNTI) of the terminal device.
  • C-RNTI cell-radio network temporary identifier
  • the first request message may also be used to request the network device for the first system information that has changed within the first time period.
  • the terminal device may request the network device to obtain the first system information for terminal device positioning, such as posSIB, during the positioning period, but not during the positioning period, the network device may not continue to request the posSIB to save the network device overhead.
  • the first request message may carry the first duration to request the network device to obtain the first system information that has changed within the first duration. That is, if the action of changing the first system information is within the first time period, the network device sends the changed first system information to the terminal device.
  • the first duration may be the duration of the positioning period of the terminal device.
  • the first duration may be characterized by the start moment of the first duration and the end moment of the first duration, that is, the first request message may carry two time information, for example, the first time information and the second time information.
  • the first time information may indicate the start time of the first duration, and correspondingly, the second time information indicates the end time of the first duration.
  • Both the first time information and the second time information may be coordinated universal time (UTC), for example, the first time information represents the first UTC, the second time information represents the second UTC, the first UTC and the second UTC
  • UTC universal time
  • both the first time information and the second time information may be the number of the subframe or the number of the radio frame.
  • both the first time information and the second time information are numbers of subframes, and the interval between these two subframes is the first duration.
  • both the first time information and the second time information are numbers of wireless frames, and the interval between the two wireless frames is the first duration.
  • the first duration may be characterized by a starting time and a duration, that is, the first request message may carry a piece of time information and a piece of duration information.
  • the time information may indicate a moment
  • the duration information may indicate a duration to instruct the network device to start from this moment.
  • the first system information changes, the first system information is sent to the terminal device .
  • S503 The network device stops sending the changed first system information to the terminal device after the first time period.
  • the network device sends the changed first system information to the terminal device.
  • the terminal device receives the first system information from the network device within the first time period, or it can also be considered that the terminal device monitors the first system information from the network device within the first time period, and after the first time period, does not Then monitor the first system information from the network device. If the network device determines that the system information changes after the first time period, the network device no longer sends the first system information to the terminal device.
  • the terminal device may The first system information is not always needed. For example, during the positioning period, the terminal device requests the network device to obtain posSIB, but outside the positioning period, the terminal device does not need posSIB. Therefore, when the terminal device no longer needs the first system information, it can instruct the network device to no longer send the first system information to the terminal device, thereby saving the overhead of the network device.
  • S504 The terminal device sends a second request message to the network device.
  • the second request message may be used to instruct the network device to no longer send the changed first system information to the terminal device.
  • the network device receives the first request message, and then sends the changed first system information to the terminal device, and stops sending the changed first system information to the terminal device until the second request message is received, so as to save network side resource overhead , Reduce the energy consumption of network equipment.
  • the second request message may carry the first number or the second number. If the first request message carries the first number, the second request message also carries the first number; and if the first request message carries the second number, the second request message also carries the second number to inform the network device to stop sending to the terminal device Is the first system information.
  • S504 is not necessary, so it is illustrated by a dotted line in FIG. 5.
  • the terminal device may not perform S504. It should be noted that although the first request message carries the first duration, the terminal device may also perform S504.
  • the network device can determine that the terminal device needs to change the first system information. In this case, the first request message is not necessary. When the first system information changes, the network device actively sends The terminal device sends the changed first system information. However, in this case, if the terminal device determines that the changed first system information is not needed, it can still send the second request message to the network device.
  • the first request message and the second request message may be the same message.
  • the message may include an indication information.
  • the indication information may be used to instruct the network device to send the first system information, or the indication information may be used to instruct the network device to no longer Send the first system information.
  • the indication information can be carried in a field of this message, and the indication information can occupy 1 bit.
  • the value of the indication information is "0" it can instruct the network device to send when the first system information changes. The changed first system information; accordingly, when the value of the indication information is "1", it can instruct the network device not to send the first system information.
  • the indication information when the value of the indication information is "1", it can instruct the network device to send the changed first system information when the first system information changes; accordingly, when the indication information is taken The value is "0", which can indicate that the network device does not send the first system information.
  • FIG. 6 is a schematic diagram of a terminal device requesting to obtain posSIB. If the first request message does not carry the first duration, and the terminal device needs posSIB during positioning, the terminal device can send the first request message to the network device at the beginning of the positioning period until the terminal device no longer needs posSIB, then The second request message may be sent to the network device, that is, the terminal device sends the second request message at the end of the positioning period.
  • the first request message is indicated by posSIBs request
  • the second request message is indicated by Cancel posSIBs request.
  • the network device After the network device receives the first request message, as long as it is determined that the posSIB has changed, it will send the changed posSIB to the terminal device. Until the network device receives the second request message, it will not continue to send the changed posSIB to the terminal device. . It can be seen that, as shown in Figure 6, during the positioning of the terminal device, posSIB has changed 5 times, but the terminal device only needs to request posSIB once, and the network device will send the posSIB changed 5 times to the terminal device. The terminal device needs to request 5 posSIB, which saves the terminal device's overhead.
  • FIG. 7 is a schematic diagram of a terminal device requesting to obtain a posSIB.
  • the first request message carries the first duration
  • the positioning period of the terminal device may be the first duration.
  • the terminal device can send the first request message to the network device at the beginning of the positioning period.
  • the network device After receiving the first request message, the network device sends the posSIB to the terminal device as long as it is determined that the posSIB has changed. Until the end of the first time period, the network device stops sending the posSIB to the terminal device.
  • the network device may also send an Acknowledgement (ACK) message to the terminal device.
  • the ACK can be a physical layer message, MAC layer message or RRC layer message. If the network device determines to send the SI message by broadcasting, the ACK message can inform the terminal device that the network device has received the first request message and sends the SI message by broadcasting. If the network device determines to send the SI message in unicast mode, the ACK message can inform the terminal device that the network device has received the first request message and sends the SI message in unicast mode.
  • the first durations corresponding to the first request messages of different terminal devices may also be different.
  • the first request message 1 sent by the terminal device 1 carries the first duration as duration 1
  • the first request message 2 sent by the terminal device 2 carries the first duration.
  • the first duration carried in the first request message 3 sent by the terminal device 3 is duration 3, and duration 1, duration 2, and duration 3 are all different.
  • the network device can choose when to stop broadcasting the SI message. For example, the network device may continue to broadcast the SI message after the first duration until the end time of the second duration is reached.
  • the second duration is the duration of the latest end time among the multiple first durations carried in the multiple first request messages.
  • duration 1 is the earliest end time duration among duration 1, duration 2, and duration 3
  • duration 3 is the latest duration among duration 1, duration 2 and duration 3
  • the terminal device receives the first After the first request message 1, the first request message 2 and the first request message 3, the SI message may continue to be broadcast after the duration 1 until the end of the duration 3, and the network device stops broadcasting the SI message.
  • the second request message sent by the terminal device to the network device may also carry the second number to inform the network device to stop sending the SI message corresponding to the second number.
  • the received first system information obtained from the SI message may have expired.
  • the first system information is posSIB
  • the validity period of the posSIB is less than the period of the network device broadcasting system information
  • the posSIB received by the terminal device may expire.
  • the terminal device determines that the received first system information has expired, the terminal device can directly read the broadcast of the network device to obtain the latest first system information.
  • the terminal device requests the acquired posSIB, and the terminal device determines whether the acquired posSIB is expired or not can be determined according to the posSIB identifier, such as area specific.
  • the following takes the process of terminal device positioning as an example to introduce the terminal device to determine whether the acquired posSIB has expired.
  • the process of terminal device positioning includes the following steps:
  • Step S801 The positioning server sends positioning assistance information to the network device.
  • the positioning assistance information is used for positioning of the terminal device.
  • the positioning server may indicate the identification of the positioning assistance information, such as area specific or cell specific.
  • the positioning server may also indicate the system information area ID (SI area ID) of the positioning assistance information.
  • SI area ID system information area ID
  • Step S802 The network device sends the first system information to the terminal device.
  • the network device After the network device receives the positioning assistance information, it can send the positioning assistance information through the corresponding posSIB. Specifically, the network device may send SIB1 to the terminal device.
  • the SIB1 includes scheduling information of posSIB and includes identification information indicating posSIB, which is used to indicate whether the posSIB identification is area-specific or cell-specific.
  • the posSIB identifier corresponding to the positioning assistance information may be updated to cell specific.
  • Step S803 The terminal device stores the first system information used for positioning.
  • the terminal device obtains the posSIB according to SIB1. If it is determined that the posSIB identifier is area specific, then when the terminal device stores the posSIB, it also needs to store the main PLMN and the SI area identifier. In this way, if the identity of the posSIB is area specific, after the terminal device moves to a new cell, it can judge whether the stored posSIB is valid by judging the primary PLMN and SI area identity of the cell.
  • the terminal device can re-read the posSIB issued by the network device when the posSIB is determined to be invalid, thereby reducing the overhead of the terminal device frequently reading system information.
  • the first request message can request the network device to send the changed first system information, that is, even if the first system information changes, the terminal device does not need to send the network device to the network again.
  • the network device can actively send the changed first system information to the terminal device when the first system information changes, thereby reducing the number of requests for the terminal device, reducing the overhead for the terminal device to obtain system information, and also reducing The energy consumption of the terminal equipment.
  • the methods provided in the embodiments of the present application are introduced from the perspective of network equipment, terminal, and interaction between the network equipment and the terminal.
  • the network device and the terminal may include hardware structures and/or software modules, and the above functions are implemented in the form of hardware structures, software modules, or hardware structures plus software modules. Whether one of the above-mentioned functions is executed in a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.
  • FIG. 9 shows a schematic structural diagram of a communication device 900.
  • the communication device 900 can implement the functions of the terminal device in the method provided in the embodiments of the present application; the communication device 900 may also be a device that can support the terminal device to implement the corresponding functions in the method provided in the embodiments of the present application.
  • the communication device 900 may be a hardware structure, a software module, or a hardware structure plus a software module.
  • the communication device 900 may be implemented by a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication device 900 may include a processing unit 901 and a transceiving unit 902.
  • the processing unit 901 may control the transceiver unit 902 to execute S501, S5021, S5023, and S503 in the embodiment shown in FIG. 5, and/or other processes for supporting the technology described herein.
  • the transceiver unit 902 is used for the communication device 900 to communicate with other modules, and it may be a circuit, a device, an interface, a bus, a software module, a transceiver, or any other device that can implement communication.
  • the transceiving unit 902 may be used to perform the steps performed by the transceiving unit 902 in the embodiment shown in FIG. 5, and/or to support other processes of the technology described herein.
  • FIG. 10 shows a schematic structural diagram of a communication device 1000.
  • the communication device 1000 can realize the function of the network device in the method provided in the embodiment of this application; the communication device 1000 may also be a device that can support the network device to realize the function of the network device in the method provided in the embodiment of this application.
  • the communication device 1000 may be a hardware structure, a software module, or a hardware structure plus a software module.
  • the communication device 1000 may be implemented by a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication device 1000 may include a processing unit 1001 and a transceiving unit 1002.
  • the transceiver unit 1002 is used for the communication device 1000 to communicate with other modules, and it may be a circuit, a device, an interface, a bus, a software module, a transceiver, or any other device that can implement communication.
  • the transceiver unit 1002 may be used to perform S501, S5021, S5023, and S503 in the embodiment shown in FIG. 5 and/or other processes used to support the technology described herein.
  • the processing unit 1001 may be used to execute S5022 and S504 in the embodiment shown in FIG. 5, and to control the transceiver unit 1002 to execute the steps executed by the transceiver unit 1002 in the embodiment shown in FIG. 5, and/or to support this document Other processes of the described technique.
  • the communication apparatus 1100 may be a terminal device, which can realize the function of the terminal equipment in the method provided in the embodiment of this application, or the communication apparatus 1100 may be a network device , Can realize the function of the network device in the method provided in the embodiment of this application; the communication device 1100 may also be a device that can support the terminal device to realize the corresponding function in the method provided in the embodiment of this application, or can support the network device to realize the implementation of this application The corresponding function device in the method provided in the example.
  • the communication device 1100 may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.
  • the foregoing transceiver unit 902 or the transceiver unit 1002 may be a transceiver, and the transceiver is integrated in the communication device 1100 to form a communication interface 1110.
  • the communication device 1100 includes at least one processor 1120, configured to implement or support the communication device 1100 to implement the functions of the terminal device in the method provided in the embodiments of the present application.
  • the processor 1120 may generate the first request message and the second request message to be sent to the network device, and control the terminal device to send the first request message and/or the second request message to the network device.
  • the method example The detailed description is not repeated here.
  • the communication device 1100 may further include at least one memory 1130 for storing program instructions and/or data.
  • the memory 1130 and the processor 1120 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processor 1120 may cooperate with the memory 1130 to operate.
  • the processor 1120 may execute program instructions stored in the memory 1130. At least one of the at least one memory may be included in the processor.
  • the communication device 1100 may further include a communication interface 1110 for communicating with other devices through a transmission medium, so that the device used in the communication device 1100 can communicate with other devices.
  • a communication interface 1110 for communicating with other devices through a transmission medium, so that the device used in the communication device 1100 can communicate with other devices.
  • the communication device is a terminal device
  • the other device is a network device; or, when the communication device is a network device, the other device is a terminal device.
  • the processor 1120 may use the communication interface 1110 to send and receive data.
  • the communication interface 1110 may specifically be a transceiver.
  • connection medium between the communication interface 1110, the processor 1120, and the memory 1130 is not limited in the embodiment of the present application.
  • the memory 1130, the processor 1120, and the communication interface 1110 are connected by a bus 1140.
  • the bus is represented by a thick line in FIG. 11, and the connection mode between other components is only for schematic illustration. , Is not limited.
  • the bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used to represent in FIG. 11, but it does not mean that there is only one bus or one type of bus.
  • the processor 1120 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. Or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application.
  • the general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the memory 1130 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory). For example, random-access memory (RAM).
  • the memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.
  • the memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function, for storing program instructions and/or data.
  • the communication device in the foregoing embodiment may be a terminal device or a circuit, and may also be a chip applied to a terminal device or other combination devices or components having the functions of the foregoing terminal device.
  • the transceiver unit may be a transceiver, which may include an antenna and a radio frequency circuit, etc.
  • the processing module may be a processor, for example, a central processing unit (CPU).
  • the transceiver unit may be a radio frequency unit
  • the processing module may be a processor.
  • the transceiver unit may be an input and output interface of the chip system
  • the processing module may be a processor of the chip system.
  • Fig. 12 shows a schematic structural diagram of a simplified communication device. It is easy to understand and easy to illustrate.
  • the communication device uses a network device as an example.
  • the base station may be applied to the system shown in FIG. 4, and may be the access network device in FIG. 4, which performs the functions of the network device in the foregoing method embodiment.
  • the network device 120 may include one or more radio frequency units, such as a remote radio unit (RRU) 1210 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU). ) 1220.
  • RRU 1210 may be called a communication module, which corresponds to the transceiver unit 1002 in FIG. 10.
  • the communication module may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1211 ⁇ RF unit 1212.
  • the RRU 1210 part is mainly used for sending and receiving of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending instruction information to terminal equipment.
  • the 1220 part of the BBU is mainly used for baseband processing and control of the base station.
  • the RRU 1210 and the BBU 1220 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 1120 is the control center of the base station, and may also be called a processing module, which may correspond to the processing unit 1001 in FIG. 10, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU processing module
  • the BBU may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.
  • the BBU 1220 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) of a single access standard, or support different access standards. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 1220 also includes a memory 1221 and a processor 1222.
  • the memory 1221 is used to store necessary instructions and data.
  • the processor 1222 is used to control the base station to perform necessary actions, for example, used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the memory 1221 and the processor 1222 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • Fig. 13 shows a schematic structural diagram of a simplified communication device. It is easy to understand and easy to illustrate.
  • the communication device uses a mobile phone as an example.
  • the terminal equipment includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • only one memory and processor are shown in FIG. 13. In actual terminal equipment products, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device
  • the processor with the processing function can be regarded as the processing unit of the terminal device.
  • the terminal device includes a transceiver unit 1310 and a processing unit 1320.
  • the transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, and so on.
  • the processing unit may also be called a processor, a processing board, a processing module, a processing device, and so on.
  • the device for implementing the receiving function in the transceiver unit 1310 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 1310 as the sending unit, that is, the transceiver unit 1310 includes a receiving unit and a sending unit.
  • the transceiver unit may sometimes be called a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may sometimes be called a receiver, receiver, or receiving circuit.
  • the transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • transceiving unit 1310 is used to perform sending and receiving operations on the terminal device side in the foregoing method embodiment
  • processing unit 1320 is used to perform other operations on the terminal device in the foregoing method embodiment except for the transceiving operation.
  • the transceiver unit 1310 may be used to execute S501, S5021, S5023, and S503 in the embodiment shown in FIG. 5, and/or other processes used to support the technology described herein.
  • the processing unit 1220 may be used to execute the steps performed by the transceiver unit 1310 in the embodiment shown in FIG. 5 and/or to support other processes of the technology described herein.
  • the chip When the terminal device is a chip, the chip includes a transceiver unit and a processing unit.
  • the transceiver unit may be an input/output circuit or a communication interface;
  • the processing unit is a processor or microprocessor or integrated circuit integrated on the chip.
  • the device can perform functions similar to the processing unit 1320 in FIG. 13.
  • the device includes a processor 1410, a data sending processor 1420, and a data receiving processor 1430.
  • the processing unit 901 or the processing unit 1001 in the foregoing embodiment may be the processor 1410 in FIG. 14 and perform corresponding functions.
  • the processing unit 901 or the processing unit 1001 in the foregoing embodiment may be the sending data processor 1420 and/or the receiving data processor 1430 in FIG. 14.
  • the channel encoder and the channel decoder are shown in FIG. 14, it can be understood that these modules do not constitute a restrictive description of this embodiment, and are only illustrative.
  • the terminal device 1500 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the terminal device in this embodiment can be used as the modulation subsystem therein.
  • the modulation subsystem may include a processor 1503 and an interface 1504.
  • the processor 1503 performs the functions of the aforementioned processing unit 901 or the processing unit 1001, and the interface 1504 performs the functions of the aforementioned transceiving unit 902 or the transceiving unit 1002.
  • the modulation subsystem includes a memory 1506, a processor 1503, and a program stored in the memory 1506 and running on the processor.
  • the processor 1503 implements the first terminal in the foregoing method embodiment when the program is executed.
  • the memory 1506 can be non-volatile or volatile, and its location can be located inside the modulation subsystem or in the processing device 1500, as long as the memory 1506 can be connected to the The processor 1503 is fine.
  • the embodiments of the present application also provide a communication system.
  • the communication system includes a terminal device and a network device, or may also include more terminal devices and network devices.
  • the terminal device and the network device are respectively used to implement the functions of the related devices in FIG. 5 or FIG. 8 described above.
  • the relevant descriptions in the above method embodiments please refer to the relevant descriptions in the above method embodiments, which will not be repeated here.
  • An embodiment of the present application also provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device and the network device in FIG. 5 or FIG. 8.
  • the embodiments of the present application also provide a computer program product, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device and the network device in FIG. 5 or FIG. 8.
  • the embodiment of the present application provides a chip system.
  • the chip system includes a processor and may also include a memory for implementing the functions of the terminal device and the network device in the foregoing method.
  • the chip system can be composed of chips, or can include chips and other discrete devices.
  • the methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented by software, it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, network equipment, user equipment, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • a computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc., integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, hard disk, Magnetic tape), optical media (for example, digital video disc (DVD for short)), or semiconductor media (for example, SSD).

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Abstract

一种系统信息的获取方法、发送方法及装置，该方法为处于连接态的终端设备提供了获取系统信息的一种方法，该方法包括：终端设备向网络设备发送第一请求消息，该第一请求消息用于请求来自网络侧的变化后的第一系统信息；然后，该终端设备接收来自网络设备的第一系统信息。由于网络设备可以在第一系统信息发生变化时主动将变化后的第一系统信息发送给终端设备，所以即使第一系统信息发生了变化，终端设备也无需再次向网络设备发送请求，从而减少了终端设备的请求次数，减少了终端设备获取系统信息的开销。

Description

一种系统信息的获取方法、发送方法及装置
本申请要求在2019年08月14日提交中国专利局、申请号为PCT/CN2019/100653、发明名称为“一种系统信息的获取方法、发送方法及装置”的PCT专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及移动通信技术领域，尤其涉及一种系统信息的获取方法、发送方法及装置。
背景技术
在长期演进(long term evolution，LTE)系统中，系统信息包括主信息块(master information block，MIB)、系统信息块1(system information block 1，SIB1)，除SIB1之外的其他系统信息块和用于定位的系统信息块。除了SIB1之外的其他系统信息块也称为其他系统信息(other system information，OSI)，用于定位的系统信息块可以称为定位系统信息块(positioning system information block,posSIB)。MIB和SIB1为必要系统信息，OSI和posSIB为非必要系统信息。OSI和posSIB在传输时，承载在系统信息消息上，一条系统信息消息可以承载多个OSI，或者多个posSIB。
在第五代移动通信技术(5th-generation，5G)中，必要系统信息周期性广播传输，非必要系统信息可以基于特定终端设备的需求提供给终端设备，以节约系统资源，这种发送方式，称为按需系统信息(on-demand SI)。例如，终端设备在进行定位时，可以向网络设备请求获取posSIB，网络设备基于UE的请求向终端设备发送posSIB。
由于posSIB的有效时间较短，所以UE在定位期间，可能会多次向网络设备请求获取posSIB，导致传输资源开销较大。
发明内容
本申请提供一种系统信息的获取方法、发送方法及装置，用于节约终端设备获取系统信息的开销。
第一方面，提供一种系统信息的获取方法，该方法包括：终端设备向网络设备发送第一请求消息，该第一请求消息用于请求来自网络侧的变化后的第一系统信息；然后，该终端设备接收来自网络设备的第一系统信息。
该方法可由第一通信装置执行，第一通信装置可以是通信设备或能够支持通信设备实现该方法所需的功能的通信装置，例如芯片系统。示例性地，所述通信设备为终端设备。
在本申请实施例中，第一请求消息可以请求网络设备发送变化后的第一系统信息，也就是说，即使第一系统信息发生了变化，终端设备也无需再次向网络设备发送请求，网络设备可以在第一系统信息发生变化时主动将变化后的第一系统信息发送给终端设备，从而减少了终端设备的请求次数，减少了终端设备获取系统信息的开销，也降低了终端设备的能耗。
在一种可能的实施方式中，终端设备在发送第一请求消息时，并不知晓系统信息是否 发生变化。
结合第一方面，在第一方面的一种可能的实施方式中，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
在本申请实施例中，第一请求消息可以携带第一时长，以指示网络设备向终端设备发送在第一时长内发生变化的第一系统信息，如果超过第一时长，网络设备可以停止向终端设备发送变化后的第一系统信息，有助于节省网络设备针对第一系统信息进行发送的开销。
在一种可能的实施方式中，所述方法还包括：
所述终端设备向所述网络设备发送第二请求消息，所述第二请求消息用于指示所述网络设备不再向所述终端设备发送变化后的所述第一系统信息。
在本申请实施例中，终端设备不再需要变化后的第一系统信息，可以通过第二请求消息指示网络设备不再发送变化后的第一系统信息，有助于节省网络设备针对第一系统信息进行发送的开销。
在一种可能的实施方式中，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第一系统信息包含所述系统信息消息，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
在本申请实施例中，第一请求消息的实现方式可以有多种，例如可以请求系统信息块，也可以请求系统信息消息，本申请实施例并不限制第一请求消息究竟如何实现。
在一种可能的实施方式中，所述方法还包括：
所述终端设备根据所述第一系统信息确定所述系统信息消息的编号。
结合第一方面，在第一方面的一种可能的实施方式中，所述第一请求消息携带比特映射，所述比特映射用于指示系统信息块或系统信息消息。
在本申请实施例中，第一请求消息可以携带比特映射，从而可以通过比特映射更加清楚地区分系统信息块和系统信息消息。
在一种可能的实施方式中，所述方法还包括：
所述终端设备接收来自所述网络设备的变化后的所述第一系统信息。
在一种可能的实施方式中，所述方法还包括：
所述终端设备在所述第一时长内，接收来自所述网络设备的变化后的所述第一系统信息。
在本申请实施例中，如果第一请求消息携带第一时长，那么终端设备可以在第一时长内监测变化后的第一系统信息，而不需要一直监测第一系统信息，从而可以降低终端设备的能耗。
在一种可能的实施方式中，所述方法还包括：
接收来自所述网络设备的第一取值，以及将所述第一系统信息包含的系统信息块的取值标签的当前取值更新为所述第一取值；或者，
将所述第一系统信息包含的系统信息块的取值标签的当前取值执行加1操作。
在本申请实施例中，网络设备会告知终端设备发生变化的系统信息所在的系统信息块的取值标签的取值为第一取值，这样终端设备在存储该系统信息块时，可以将第一取值存 储为该系统信息块的取值标签的取值，以保证终端设备所存储的系统信息块的取值标签所指示的取值与系统信息块的内容匹配。
在一种可能的实施方式中，所述第一系统信息用于所述终端设备的定位。
本申请实施例提供了一种应用场景，即系统信息可以用于终端设备的定位，例如系统信息是posSIB，从而当posSIB失效后，网络设备会主动向终端设备发送变化后的posSIB，从而终端设备不需要再次向网络设备请求获取posSIB，节约了终端设备获取posSIB的开销。
在一种可能的实施方式中，第一请求消息为专用信令。
在一种可能的实施方式中，第一请求消息中包含所述终端设备的小区无线网络临时标识。
本申请实施例中，第一请求消息可以携带小区无线网络临时标识，即使第一请求消息不是专用信令，网络设备根据小区无线网络临时标识也可以知道应该向哪个终端设备发送变化后的第一系统信息。
第二方面，本申请实施例提供了一种系统信息的发送方法，该方法包括：网络设备接收来自终端设备的第一请求消息，该第一请求消息用于请求来自网络侧的变化后的第一系统信息，从而网络设备响应于该第一请求消息，在第一系统信息发生变化时，向终端设备发送变化后的第一系统信息。
该方法可由第二通信装置执行，第二通信装置可以是终端或能够支持终端实现该方法所需的功能的通信装置，当然还可以是其他通信装置，例如芯片系统。这里以第二通信装置是网络设备为例。
在一种可能的实施方式中，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
在一种可能的实施方式中，所述方法还包括：
所述网络设备接收来自所述终端设备的第二请求消息，所述第二请求消息用于指示所述网络设备不再向所述终端设备发送变化后的所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含在所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
在一种可能的实施方式中，所述网络设备响应于所述第一请求消息，在所述第一系统信息发生变化时，向所述终端设备发送所述第一系统信息，包括：
所述网络设备向所述终端设备发送与所述第二编号对应的系统信息消息。
在一种可能的实施方式中，所述第一系统信息用于所述终端设备的定位。
在一种可能的实施方式中，所述方法还包括：
向所述通信装置发送第一取值，所述第一取值为所述第一系统信息包含的系统信息块的取值标签的取值。
在一种可能的实施方式中，所述方法还包括：
所述网络设备在所述第一时长后，不发送变化后的所述第一系统信息；或者，
所述网络设备在所述第一时长后，继续发送变化后的所述第一系统信息，直到到达第二时长的结束时刻，其中，所述网络设备接收了来自多个终端设备的用于请求所述系统信息的多个请求消息，所述终端设备是所述多个终端设备中的一个，所述多个请求消息中的至少一个请求消息携带了至少一个时长，所述第一时长和所述第二时长属于所述至少一个时长，且所述第二时长是所述至少一个时长中结束时刻最晚的时长。
在一种可能的实施方式中，所述方法还包括：
所述网络设备在所述第一时长后，不发送所述系统信息消息；或者，
所述网络设备在所述第一时长后，继续发送变化后的所述系统信息消息，直到到达第二时长的结束时刻，其中，所述网络设备接收了来自多个终端设备的用于请求所述系统信息的多个请求消息，所述终端设备是所述多个终端设备中的一个，所述多个请求消息中的至少一个请求消息携带了至少一个时长，所述第一时长和所述第二时长属于所述至少一个时长，且所述第二时长是所述至少一个时长中结束时刻最晚的时长。
在一种可能的实施方式中，所述第一请求消息为专用信令。
在一种可能的实施方式中，第一请求消息中包含所述终端设备的小区无线网络临时标识C-RNTI。
关于第二方面或第二方面的各种可能的实施方式所带来的技术效果，可以参考对第一方面或第一方面的各种可能的实施方式的技术效果的介绍。
第三方面，本申请实施例提供了一种通信装置，包括收发单元和处理单元，其中：
所述收发单元，用于在处理单元的控制下向网络设备发送第一请求消息，所述第一请求消息用于请求来自网络侧的变化后的第一系统信息；
在处理单元的控制下，接收来自所述网络设备的所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
在一种可能的实施方式中，所述收发单元还用于：
向所述网络设备发送第二请求消息，所述第二请求消息用于指示所述网络设备不再向所述终端设备发送变化后的所述第一系统信息。
在可能的实施方式中，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第一系统信息包含所述系统信息消息，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
在一种可能的实施方式中，所述处理单元还用于：
根据所述第一系统信息确定所述系统信息消息的编号。
在一种可能的实施方式中，所述收发单元还用于：
在所述第一时长内，接收来自所述网络设备的变化后的所述第一系统信息。
在一种可能的实施方式中，所述收发单元还用于：接收来自所述网络设备的第一取值，所述处理单元还用于：将所述第一系统信息包含的系统信息块的取值标签的当前取值更新为所述第一取值；或者，
所述处理单元用于将所述第一系统信息包含的系统信息块的取值标签的当前取值执 行加1操作。
在一种可能的实施方式中，所述第一系统信息用于所述终端设备的定位。
在一种可能的实施方式中，第一请求消息为专用信令。
在一种可能的实施方式中，第一请求消息中包含所述终端设备的小区无线网络临时标识。
关于第三方面或第三方面的各种可能的实施方式所带来的技术效果，可以参考对第一方面或第一方面的各种可能的实施方式的技术效果的介绍。
第四方面，本申请实施例提供了一种通信装置，包括收发单元和处理单元，其中：
所述收发单元，用于在处理单元的控制下，接收来自终端设备的第一请求消息，所述第一请求消息用于请求来自网络侧的变化后的第一系统信息；
所述处理单元，用于响应于所述第一请求消息，在所述第一系统信息发生变化时，控制所述收发单元向所述终端设备发送所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
在一种可能的实施方式中，所述收发单元还用于：
接收来自所述终端设备的第二请求消息，所述第二请求消息用于指示所述网络设备不再向所述终端设备发送变化后的所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含在所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
在一种可能的实施方式中，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
在一种可能的实施方式中，所述处理单元响应于所述第一请求消息，在所述第一系统信息发生变化时，控制所述收发单元向所述终端设备发送所述第一系统信息时，具体用于：
所述处理单元控制所述收发单元向所述终端设备发送与所述第二编号对应的系统信息消息。
在一种可能的实施方式中，所述收发单元还用于：
向所述通信装置发送第一取值，所述第一取值为所述第一系统信息包含的系统信息块的取值标签的取值。
在一种可能的实施方式中，所述第一系统信息用于所述终端设备的定位。
在一种可能的实施方式中，
所述处理单元，还用于在所述第一时长后，控制所述收发单元不发送变化后的所述第一系统信息；或者，
所述处理单元，还用于在所述第一时长后，控制所述收发单元继续发送变化后的所述第一系统信息，直到到达第二时长的结束时刻，其中，所述收发单元接收了来自多个终端设备的用于请求所述系统信息的多个请求消息，所述终端设备是所述多个终端设备中的一个，所述多个请求消息中的至少一个请求消息携带了至少一个时长，所述第一时长和所述第二时长属于所述至少一个时长，且所述第二时长是所述至少一个时长中结束时刻最晚的时长。
在一种可能的实施方式中，第一请求消息为专用信令。
在一种可能的实施方式中，第一请求消息中包含所述终端设备的小区无线网络临时标识。
关于第四方面或第四方面的各种可能的实施方式所带来的技术效果，可以参考对第二方面或第二方面的各种可能的实施方式的技术效果的介绍。
第五方面，本申请实施例提供了一种通信装置，该通信装置包括处理器，用于实现上述第一方面中终端设备或者第二方面中网络设备所执行的方法。该通信装置还可以包括存储器，用于存储程序指令和数据。该存储器与该处理器耦合，该处理器可以调用并执行该存储器中存储的程序指令，用于实现上述第一方面中终端设备或者第二方面中网络设备所执行的任意一种方法。该通信装置还可以包括通信接口，该通信接口可以是通信装置中的收发器，例如通过所述通信装置中的天线、馈线和编解码器等实现，或者，如果第五种通信装置为设置在网络设备中的芯片，则通信接口可以是该芯片的输入/输出接口，例如输入/输出管脚等。该收发器用于该通信装置与其它设备进行通信。示例性地，当该通信装置为终端设备时，该其它设备为网络设备；或者，当该通信装置为网络设备时，该其它设备为终端设备。
第六方面，本申请实施例提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器，用于实现第一方面中终端设备或者第二方面中网络设备执行的方法。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
第七方面，本申请实施例提供了一种通信系统，所述系统包括第三方面所述的终端设备以及第四方面所述的网络设备，或包括第五方面中两种通信装置，其中一种通信装置用于实现终端设备的功能，另一种通信装置用于实现网络设备的功能。
第八方面，本申请实施例中还提供一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行第一方面中终端设备或者第二方面中网络设备执行的方法。
第九方面，本申请实施例中还提供一种计算机程序产品，包括指令，当其在计算机上运行时，使得计算机执行第一方面中终端设备或者第二方面中网络设备执行的方法。
上述第三方面至第九方面及其实现方式的有益效果可以参考对第一方面的方法及其实现方式或第一方面的方法及其实现方式的有益效果的描述。
附图说明
图1为本申请实施例提供的一种BWP的配置示意图；
图2为本申请实施例提供的一种BWP的配置示意图；
图3为现有技术提供的终端设备请求posSIB的示意图；
图4为本申请实施例提供的一种网络架构示意图；
图5为本申请实施例提供的系统信息的获取以及发送方法的流程示意图；
图6为本申请实施例提供的终端设备请求posSIB的一种示意图；
图7为本申请实施例提供的终端设备请求posSIB的一种示意图；
图8为本申请实施例提供的终端设备定位的流程示意图；
图9为本申请实施例提供的一种通信装置的一种结构示意图；
图10为本申请实施例提供的另一通信装置的一种结构示意图；
图11为本申请实施例提供的一种通信装置的一种结构示意图；
图12为本申请实施例提供的一通信装置的另一种结构示意图；
图13为本申请实施例提供的另一种通信装置的一种示意性框图；
图14为本申请实施例提供的另一种通信装置的一种结构示意图；
图15为本申请实施例提供的另一种通信装置的另一种结构示意图。
具体实施方式
为了使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施例作进一步地详细描述。
在介绍本申请之前，首先对本申请实施例中的部分用语进行简单解释说明，以便于本领域技术人员理解。
1)终端设备，包括向用户提供语音和/或数据连通性的设备，例如可以包括具有无线连接功能的手持式设备、或连接到无线调制解调器的处理设备。该终端设备可以经无线接入网(radio access network，RAN)与核心网进行通信，与RAN交换语音和/或数据。该终端设备可以包括用户设备(user equipment，UE)、无线终端设备、移动终端设备、设备到设备通信(device-to-device，D2D)终端设备、车与外界(vehicle-to-everything，V2X)终端设备、机器到机器/机器类通信(machine-to-machine/machine-type communications，M2M/MTC)终端设备、物联网(internet of things，IoT)终端设备、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、远程站(remote station)、接入点(access point，AP)、远程终端(remote terminal)、接入终端(access terminal)、用户终端(user terminal)、用户代理(user agent)、或用户装备(user device)等。例如，可以包括移动电话(或称为“蜂窝”电话)，具有移动终端设备的计算机，便携式、袖珍式、手持式、计算机内置的移动装置等。例如，个人通信业务(personal communication service，PCS)电话、无绳电话、会话发起协议(session initiation protocol，SIP)话机、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、等设备。还包括受限设备，例如功耗较低的设备，或存储能力有限的设备，或计算能力有限的设备等。例如包括条码、射频识别(radio frequency identification，RFID)、传感器、全球定位系统(global positioning system，GPS)、激光扫描器等信息传感设备。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备或智能穿戴式设备等，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能头盔、智能首饰等。
而如上介绍的各种终端设备，如果位于车辆上(例如放置在车辆内或安装在车辆内)，都可以认为是车载终端设备，车载终端设备例如也称为车载单元(on-board unit，OBU)。
2)网络设备，例如包括接入网(access network，AN)设备，例如基站(例如，接入点)，可以是指接入网中在空口通过一个或多个小区与无线终端设备通信的设备，或者例如，一种V2X技术中的网络设备为路侧单元(road side unit，RSU)。基站可用于将收到的 空中帧与网际协议(IP)分组进行相互转换，作为终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括IP网络。RSU可以是支持V2X应用的固定基础设施实体，可以与支持V2X应用的其他实体交换消息。网络设备还可协调对空口的属性管理。例如，网络设备可以包括长期演进(long term evolution，LTE)系统或高级长期演进(long term evolution-advanced，LTE-A)中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，或者也可以包括5G NR系统中的下一代节点B(next generation node B，gNB)或者也可以包括云接入网(cloud radio access network，Cloud RAN)系统中的集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)，本申请实施例并不限定。
3)系统信息包括主信息块(master information block，MIB)，系统信息块1(system information block 1，SIB1)，除SIB1之外的其他系统信息块和用于定位的系统信息块。除了SIB1之外的其他系统信息块也称为其他系统信息(other system information,OSI)，用于定位的系统信息块可以称为定位系统信息块(Positioning system information block,posSIB)。MIB和SIB1为必要系统信息，OSI和posSIB为非必要系统信息。OSI和posSIB在传输时，承载在系统信息消息上，一条系统信息消息可以承载多个OSI，或者多个posSIB。posSIB主要承载定位所需的辅助信息，每个posSIB会携带信息指示当前posSIB的有效时间，由于终端设备定位的辅助信息变化速度很快，所以某些posSIB的有效时间很短。
4)SI消息(SI message)，用于承载SI。一个SI消息中可以包括一个SIB或多个SIB。SIB和SI消息之间的映射关系(即一个SI消息中包括哪些SIB)可以包括在SIB1中(例如，调度信息中)。调度信息可以包括调度周期(SI-periodicity)和承载的SIB的类型(即SIB到SI消息的映射关系等)。通常一个SIB不能分割映射到两个不同的SI消息中。例如，一个SIB可以承载到一个SI消息，又例如，一个posSIB可以承载到一个SI消息。基站广播SI消息，可以将SIB和posSIB通知给终端设备。
5)带宽部分(bandwidth part，BWP或BP)，在新无线(new radio，NR)系统中，考虑到不同的业务类型、终端设备的带宽能力或终端设备的功耗等因素，引入了BWP的概念。基站通过为终端设备配置多种不同带宽的BWP，可以实现对终端设备的灵活调度。
BWP可以是频域上一段连续的资源，也可以称为载波带宽部分(carrier bandwidth part)、子带(subband)带宽、窄带或窄带(narrowband)带宽，或者还可以有其他的名称，在本申请实施例中，为了简便，以名称是BWP为例。例如，一个BWP包含连续的K(K>0)个子载波；或者，一个BWP为N个不重叠的连续的资源块(resource block，RB)所在的频域资源，该RB的子载波间隔可以为15KHz、30KHz、60KHz、120KHz、240KHz、480KHz或其他值；或者，一个BWP为M个不重叠的连续的资源块组(resource block group，RBG)所在的频域资源，一个RBG包括P(P>0)个连续的RB，该RB的子载波间隔(subcarrier spacing，SCS)可以为15KHz、30KHz、60KHz、120KHz、240KHz、480KHz或其他值，例如为2的整数倍。一个BWP与一个特定的系统参数(numerology)相关，所述系统参数包括子载波间隔、循环前缀(cyclic prefix，CP)、或子载波间隔和CP。进一步地，BWP还可以是频域上非连续的多段资源。
如图1的#1所示，在载波宽带(carrier BW)内，针对一个终端设备可仅配置一个BWP，所述BWP的带宽可以小于或等于终端设备带宽能力(UE bandwidth capability)，终端设备带宽能力可以小于或等于载波带宽(carrier BW)。如图1的#2所示，在载波带宽中，针对一个终端设备可配置两个BWP，分别为BWP1和BWP2，且BWP1和BWP2的带宽可以 相重叠。如图1的#3所示，在载波带宽中，针对一个终端设备可配置两个BWP，分别为BWP1和BWP2，且BWP1和BWP2可以不重叠。BWP1和BWP2的系统参数可以是相同的系统参数，或者也可以是不同的系统参数。实际中，BWP的配置(例如BWP的个数、位置、和/或系统参数等配置)还可以是其它的配置，本申请实施例不做限制。
如图2所示，BWP可以分为两类，分别为初始(Initial)BWP和激活(Active)BWP。Initial BWP指的是小区定义(cell defined)的同步信息块(synchronisation signal block，SSB)中广播的MIB所指示的SIB1所在位置的带宽。在Initial BWP上UE可以获取SIB1，以及其他系统信息(other system information，OSI)，并且可以监听寻呼，主要用于终端设备发起随机接入等。Active BWP主要用于数据业务传输，一般UE有业务到达时，基站会将终端设备从Initial BWP上调度到一个带宽和其业务相匹配的BWP上。Active BWP上配置的有类型Type0A以及类型Type2的物理下行控制信道(physical downlink control channel，PDCCH)公共搜索空间(common search space，CSS)。终端设备可以在当前Active BWP上接收寻呼以及OSI。
6)按需SI，指的就是按需方式发送的SI。在NR系统中，SI的发送方式有两种，一种是通过广播方式发送，这种方式可以理解为，无需终端设备请求，网络设备会周期性通过广播发送；还有一种是按需方式发送，对此可以理解为是根据终端设备的请求发送。例如，在网络设备为终端设备配置的系统信息广播状态为“不广播”的情况下，如果终端设备需要获得SI，则终端设备可以向基站发送SI获取请求，网络设备根据来自终端设备的SI获取请求，通过广播消息或专用信令等方式将终端设备所请求的SI发送给终端设备。例如，网络设备在每个载波或服务小区上最多可以给终端设备配置4个激活的BWP。按照目前协议的结论，并不一定会为每个激活的BWP都配置SI公共搜索空间，而只有配置了SI公共搜索空间，网络设备才会在SI公共搜索空间中周期性广播SI。那么对于一个终端设备来说，如果该终端设备所在的激活的BWP并未配置SI公共搜索空间，则该终端设备无法获得网络设备周期性发送的SI，而只能通过按需方式获得SI。
其中，系统信息广播状态是网络设备事先配置给终端设备的，如果系统信息广播状态为“不广播”，也就表明网络设备不会周期性广播SI，因此需要终端设备主动获取。
如果SI根据终端设备的请求发送，则终端设备一般可以在随机接入过程中向网络设备发送请求。例如，SI获取请求可以是第一消息(Msg1)，终端设备可以通过随机接入过程中的Msg1向网络设备请求SI，而网络设备可以通过广播方式或专用信令向终端设备发送SI。或者，SI获取请求可以是第三消息(Msg3)，可以通过随机接入过程中的Msg3向网络设备请求SI，而网络设备可以通过广播方式或专用信令向终端设备发送SI。其中，终端设备通过随机接入过程中的Msg1向基站请求SI的方式也可以称为基于Msg1(Msg1based)的方式，终端设备通过随机接入过程中的Msg3向基站请求SI的方式也可以称为基于Msg3(Msg3based)的方式。下面分别介绍这两种方式。
Msg1based：
如果网络设备在SIB1里配置了专用于请求SI的物理随机接入信道(physical random access channel，PRACH)资源，可以理解为，是配置了PRACH资源与SI之间的映射关系。PRACH资源例如包括随机接入前导(preamble)，还可以包括其他的资源。从而终端设备可以通过网络设备所配置的PRACH资源来向网络设备请求SI。例如，终端设备通过Msg1向网络设备发送SI获取请求(可以理解为，是通过专用于请求SI的PRACH资源向基站 发送Msg1)，即终端设备可以采用Msg1based方式获取SI。终端设备可以发送一次Msg1，可以只请求一个SI，也可以发送多次Msg1，请求多个SI。网络设备通过随机接入过程中的第二消息(Msg2)向终端设备发送对于Msg1的响应消息。用于响应对于SI的请求的Msg2，一般只包含随机接入前导标识符(random access preamble identifier，RAPID)。其中，Msg1可以是preamble，Msg2可以是RAR。
Msg3based：
如果网络设备没有为终端设备配置专用于请求SI的PRACH资源，SI获取请求可以是Msg3，即终端设备就可以通过Msg3请求SI。例如，网络设备如果没有为终端设备配置专用于请求SI的PRACH资源，网络设备可以通过SIB1通知给终端设备，网络设备没有为终端设备配置专用于请求SI的PRACH资源。而终端设备在接收的SIB1中未获取基站所配置的专用于请求SI的PRACH资源的信息，就可以确定要通过Msg3请求SI。
在LTE中系统信息是一直广播的，当终端设备较少时或者需要某个SIB的UE较少时，一直广播系统信息极大地浪费系统的无线资源，因此，在NR中引入了on-demand SI机制，其主要思想是当终端设备请求某个SIB时，网络设备再进行广播，或者将这个SIB直接发送给终端设备。具体方案包括：
针对处于空闲态/非激活态的终端设备：可以使用Msg1-based的方案和Msg3-based的方案请求网络广播某些系统信息，此时请求的最小颗粒度为一个SI消息。
针对处于连接态的终端设备：可以通过专用信令请求网络，然后通过专用信令接收，请求的最小颗粒度可以是一个SIB或posSIB。
7)SI区域(area)，在LTE中，每个小区的系统信息是独立的，也就是网络设备会向终端设备发送各个小区的系统信息。终端设备在进入一个新的小区之后，需要重新获取系统信息，然而实际上，不同小区的部分系统信息可能是相同的，因此在NR系统中，引入了SI area的概念。即，一个小区对应一个area ID，每个小区会广播一个area ID，如果一个SIB被标识是区域特性(area specific)的，终端设备在存储此SIB的时候，将area ID、当前SIB的版本(例如valueTag)，以及主公共陆地移动网络(public land mobile network，PLMN)标识一起存储。这样终端设备在同一个SI area内移动时，如果新小区的此SIB的valueTag以及主PLMN与终端设备存储的信息是一致的，终端设备就不再需要重新获取系统信息，从而避免终端设备频繁获取系统信息，以节省开销。
8)SIB的取值标签，用于标识SIB的内容版本，该取值标签可以是SIB的“systeminfo Value Tag”。SIB1中包含针对每个SIB的“systeminfo Value Tag”的取值，来标识SIB的内容版本。每当SIB的内容变化一次，“systeminfo Value Tag”指示的取值会执行加1操作。目前“systeminfo Value Tag”占用5比特，可以指示0-31即32个取值。当“systeminfo Value Tag”的取值为31，之后如果SIB的内容发生变化，那么“systeminfo Value Tag”指示的取值会执行加1操作之后变为0。终端设备存储SIB时，也会存储SIB1中的“systeminfo Value Tag”的取值，当网络侧通知系统信息发生改变时，终端设备会重新接收SIB1，然后获取SIB1中的SIB，并对比新接收的SIB1的“systeminfo Value Tag”的取值，与之前的SIB1的“systeminfo Value Tag”的取值是否一致，来确定存储的SIB的内容是否发生变化。如果终端设备确定新接收的SIB1的“systeminfo Value Tag”的取值，与之前的SIB1的“systeminfo Value Tag”的取值相同，则确定SIB1中的SIB的内容没有发生变化，终端设备不需要重新获取该SIB；相反，如果终端设备确定新接收的SIB1的“systeminfo Value Tag” 的取值，与之前的SIB1的“systeminfo Value Tag”的取值不相同，则确定SIB1中的SIB的内容发生了变化，终端设备需要重新获取该SIB。
9)本申请实施例中的术语“系统”和“网络”可被互换使用。“多个”是指两个或两个以上，鉴于此，本申请实施例中也可以将“多个”理解为“至少两个”。“至少一个”，可理解为一个或多个，例如理解为一个、两个或更多个。例如，包括至少一个，是指包括一个、两个或更多个，而且不限制包括的是哪几个，例如，包括A、B和C中的至少一个，那么包括的可以是A、B、C、A和B、A和C、B和C、或A和B和C。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，字符“/”，如无特殊说明，一般表示前后关联对象是一种“或”的关系。
除非有相反的说明，本申请实施例提及“第一”、“第二”等序数词用于对多个对象进行区分，不用于限定多个对象的顺序、时序、优先级或者重要程度。
如上介绍了本申请实施例涉及的一些概念，下面介绍本申请实施例的技术特征。
终端设备在进行定位时，终端设备可以向网络设备发送SI获取请求，以向网络设备请求获取posSIB。网络设备接收到SI获取请求之后，可以向终端设备发送posSIB，而终端设备接收posSIB，并在所获取的posSIB失效后，可以重新向网络设备发送SI获取请求。如图3所示，为终端设备获取posSIB的示意图，当终端设备处于定位期间，在每一个posSIB的有效期(valid period)T的结束时刻(如图3所示的t1、t2、t3、t4、t5)，终端设备可以向网络设备发送SI获取请求，由于该SI获取请求是用于请求posSIB的，所以也可以称为定位请求消息(posSIBs request)，图3以此为例。由于posSIB的有效时间较短，所以终端设备在定位期间，需要多次向网络设备发送SI获取请求，以请求获取posSIB，导致终端设备传输资源较大，消耗较多资源和能耗。
鉴于此，提供本申请实施例的技术方案。在本申请实施例中，终端设备在定位期间可以请求网络设备直接将变化后的第一系统信息发送给终端设备，从而不需要终端设备在第一系统信息失效后，再次请求获取第一系统信息。通过这种方式，可以减少终端设备向网络设备请求获取第一系统信息的次数，从而节约了传输资源，降低了终端设备的能耗。
本申请实施例提供的技术方案可以应用于5G系统，或者应用于未来的通信系统或其他类似的通信系统。另外，本申请实施例提供的技术方案可以应用于蜂窝链路、PLMN网络、机器到机器(machine to machine，M2M)网络、物联网(internet of things，IoT)网络或者其他网络。也可以应用于设备间的链路，例如设备到设备(device to device，D2D)链路。D2D链路，也可以称为sidelink，其中侧行链路也可以称为边链路或副链路等。在本申请实施例中，上述的术语都是指相同类型的设备之间建立的链路，其含义相同。所谓相同类型的设备，可以是终端设备到终端设备之间的链路，也可以是基站到基站之间的链路，还可以是中继节点到中继节点之间的链路等，本申请实施例对此不做限定。对于终端设备和终端设备之间的链路，有第三代合作伙伴计划(third generation partnership project，3GPP)的版本(Rel)-12/13定义的D2D链路，也有3GPP为车联网定义的车到车、车到手机、或车到任何实体的V2X链路，包括Rel-14/15。还包括目前3GPP正在研究的Rel-16及后续版本的基于NR系统的V2X链路等。
请参考图4，为本申请实施例所应用的一种应用场景，或者说是本申请实施例应用的一种网络架构。在图4中包括接入网设备和6个终端设备，这6个终端设备可以是蜂窝电 话、智能电话、便携式电脑、手持通信设备、手持计算设备、卫星无线电装置、全球定位系统、PDA和/或用于在无线通信系统上通信的任意其它适合设备，且均可以与接入网设备连接。这六个终端设备均能够与接入网设备通信。例如，终端设备可以为窄带终端设备，例如mMTC终端设备；终端设备可以为宽带终端设备，例如为现有版本(release)15的NR终端设备。当然图4中的终端设备的数量只是举例，还可以更少或更多。
图4中的接入网设备可以是基站。其中，接入网设备在不同的系统对应不同的设备，例如在第四代移动通信技术(4th-generation，4G)系统中可以对应eNB，在5G系统中对应gNB。
下面结合附图介绍本申请实施例提供的技术方案。
本申请实施例提供一种系统信息的获取方法，请参见图5，为该方法的流程图。在下文的介绍过程中，以该方法应用于图4所示的网络架构为例。另外，该方法可由两个通信装置执行，这两个通信装置例如为第一通信装置和第二通信装置，其中，第一通信装置可以是网络设备或能够支持网络设备实现该方法所需的功能的通信装置，或者第一通信装置可以是终端设备或能够支持终端设备实现该方法所需的功能的通信装置(例如芯片系统)。对于第二通信装置也是同样，第二通信装置可以是网络设备或能够支持网络设备实现该方法所需的功能的通信装置，或者第二通信装置可以是终端设备或能够支持终端设备实现该方法所需的功能的通信装置(例如芯片系统)。且对于第一通信装置和第二通信装置的实现方式均不做限制，例如第一通信装置可以是网络设备，第二通信装置是终端设备，或者第一通信装置和第二通信装置都是网络设备，或者第一通信装置和第二通信装置都是终端设备，或者第一通信装置是网络设备，第二通信装置是能够支持终端设备实现该方法所需的功能的通信装置，等等。其中，网络设备例如为基站。
为了便于介绍，在下文中，以该方法由网络设备和终端设备执行为例，也就是，以第一通信装置是终端设备、第二通信装置是网络设备为例。例如，下文中终端设备可以是图4中的6个终端设备中的任意一个终端设备，下文中网络设备可以是图4中的网络设备。需要说明的是，本申请实施例只是以通过网络设备和终端设备执行为例，并不限制于这种场景。
具体地，请继续参见图5，该方法的流程描述如下。
S501、终端设备向网络设备发送第一请求消息，网络设备接收来自终端设备的第一请求消息。
S502、网络设备响应于第一请求消息，在第一系统信息发生变化时，向终端设备发送变化后的第一系统信息。
这里的第一请求消息用于请求网络侧变化后的第一系统信息，可以认为是终端设备向网络设备请求在第一系统信息发生变化时，网络设备向终端设备发送变化后的第一系统信息。当网络设备接收到第一请求消息后，如果确定第一系统信息发生变化，则将变化后的第一系统信息发送给终端设备。
终端设备在向网络设备发送第一请求消息时，并不知晓第一系统信息有没有发生变化，如果网络设备在接收到第一请求消息时，第一系统信息发生了变化，那么网络设备将变化后的第一系统信息发送给终端设备。如果网络设备在接收到第一请求消息时，第一系统信息还没有发生变化，那么网络设备等到第一系统信息发生变化后，将变化后的第一系统信息发送给终端设备。
需要说明的是，如果当前终端设备还没有获取第一系统信息，或者当前终端设备已经获取了第一系统信息，但是该第一系统信息当前失效了，那么第一请求消息用于终端设备向网络设备请求获取第一系统信息，并请求网络设备在第一系统信息发生变化时，向终端设备发送变化后的第一系统信息。
如果终端设备当前已经获取了第一系统信息，那么第一请求消息用于终端设备向网络设备请求在第一系统信息发生变化时，发送变化后的第一系统信息。例如，终端设备在空闲态时，已经获取了第一系统信息，之后终端设备进入连接态，此时第一请求消息可以请求网络设备在第一系统信息发生变化时，发送变化后的第一系统信息。
示例性的，第一请求消息可以携带一个指示信息，用于指示终端设备需要的是变化后的第一系统信息，还是需要当前一个可用的第一系统信息，以及变化后的第一系统信息。从而网络设备根据该指示信息可以确定终端设备需要的是变化后的第一系统信息，还是需要当前一个可用的第一系统信息以及变化后的第一系统信息。
一种可能的实施方式中，该指示信息可以占用1比特(bit)，通过该指示信息的取值指示终端设备需要的是变化后的第一系统信息，还是需要当前一个可用的第一系统信息，以及变化后的第一系统信息。
一种可能的实施方式中，这个指示信息可以是第一系统信息，如果第一请求消息携带第一系统信息，则可以表示用于请求变化后的第一系统信息。如果第一请求消息没有携带第一系统信息，则可以表示用于请求当前一个可用的第一系统信息，以及变化后的第一系统信息。
根据终端设备当前有没有获取第一系统信息，S502的执行包括如下步骤：
S5021、网络设备向终端设备发送第一系统信息，从而终端设备接收该第一系统信息。
如果当前终端设备还没有获取第一系统信息，网络设备接收到第一请求消息后，如果确定终端设备还没有获取第一系统信息，则可以向终端设备发送第一系统信息。
S5022、网络设备确定第一系统信息发生变化。
网络设备向终端设备发送第一系统信息之后，可以确定第一系统信息是否发生变化，以便在第一系统信息发生变化之后，向终端设备发送变化后的第一系统信息。
S5023、网络设备向终端设备发送变化后的第一系统信息，从而终端设备接收该变化后的第一系统信息。
网络设备确定第一系统信息发生变化，则向终端设备发送变化后的第一系统信息。
需要说明的是，如果终端设备当前已经获取了第一系统信息，网络设备接收到第一请求消息之后，可以不向终端设备发送当前的第一系统信息，而在当前第一系统信息发生变化时，才向终端设备发送变化后的第一系统信息。所以，在本申请实施例中S5021不是必须的，所以在图5中用虚线进行示意。
在本申请实施例中，当终端设备需要获取第一系统信息，且网络设备为终端设备配置的系统信息广播状态为“不广播”的情况下，终端设备可以向网络设备发送第一请求消息，以获取第一系统信息。例如在NR系统中，网络设备在每个载波或服务小区上最多可以给终端设备配置4个激活的BWP。而终端设备所在的激活的BWP并未配置系统信息CSS，则该终端设备无法获得网络设备周期性发送的系统信息，而只能通过按需方式获得系统信息，因此该终端设备可以向网络设备发送第一请求消息。
例如，如果终端设备处于空闲态或者非激活态，第一请求消息可以为随机接入过程中 的Msg1，也就是说，终端设备可以采用Msg1based方式获取第一系统信息。例如，终端设备通过随机接入过程中的Msg1向网络设备请求第一系统信息，而网络设备可以通过专用信令向终端设备发送变化后的第一系统信息。
在这种方式下，网络设备配置了专用于请求SI的PRACH资源，可以理解为，是配置了PRACH资源与SI之间的映射关系。PRACH资源例如包括preamble，还可以包括其他的资源。根据PRACH资源与SI的映射关系，终端设备发送一次Msg1，可以只请求一个SI，也可以请求多个SI。例如网络设备配置，PRACH资源1对应于SI#1，PRACH资源2对应于SI#2和SI#3。那么，如果终端设备在发送Msg1时使用的是PRACH资源1，就表明终端设备请求的是SI#1，而如果终端设备在发送Msg1时使用的是PRACH资源2，就表明终端设备请求的是SI#2和SI#3。终端设备只需根据所要请求的SI选择对应的PRACH资源即可。
又例如，如果终端设备处于空闲态或者非激活态，如果网络设备没有为终端设备配置专用于请求SI的PRACH资源，终端设备就可以通过Msg3请求SI，即第一请求消息可以为Msg3。例如，网络设备如果没有为终端设备配置了专用于请求SI的PRACH资源，则可以通过SIB1向终端设备告知网络设备没有为终端设备配置了专用于请求SI的PRACH资源。而终端设备在接收的SIB1中未获取网络设备所配置的专用于请求SI的PRACH资源的信息，就可以确定要通过Msg3请求第一系统信息。
再例如，如果终端设备处于连接态，第一请求消息可以为无线资源控制(radio resource control，RRC)信令，也就是说，终端设备可以通过RRC信令向网络设备获取第一系统信息。而网络设备也可以通过RRC信令向终端设备发送第一系统信息。
需要说明的是，上述第一请求消息通过Msg1、Msg3或RRC信令实现仅是举例，本申请实施例不限制第一请求消息其他实现方式，例如第一请求消息也可以通过新增加的信令实现。
第一请求消息用于指示网络设备向终端设备发送变化后的第一系统信息，可以有几种实现方式。
示例性的，作为第一请求消息的第一种实现方式，第一请求消息可以携带第一编号和第一指示信息。
其中，第一编号为系统信息块的编号，终端设备所要获取的第一系统信息包含该系统信息块。例如终端设备请求向网络设备获取SIB2，那么第一编号可以是SIB2的编号。或者，第一编号为第一系统信息消息的编号，终端设备所要获取的第一系统信息就是第一编号所指示的第一系统信息消息。例如终端设备请求向网络设备获取posSIB，那么第一编号可以是posSIB的编号。
第一指示信息可以用于指示网络设备在第一系统信息发生变化时，发送变化后的第一系统信息。第一指示信息可以承载在第一请求消息的一个字段中。例如，第一请求消息是RRC信令，那么第一指示信息可以承载在RRC信令的一个字段中，该字段可以是RRC信令新增加的一个字段，或者也可以是RRC信令原有的字段。第一指示信息可以占用1个比特(bit)，当第一指示信息的取值为“0”，可以指示网络设备在第一系统信息发生变化时，发送变化后的第一系统信息；相应地，当第一指示信息的取值为“1”，可以指示网络设备发送当前的第一系统信息，或者，指示网络设备不发送第一系统信息。在其它的实施例中，当第一指示信息的取值为“1”，可以指示网络设备在第一系统信息发生变化时，发送 变化后的第一系统信息；相应地，当第一指示信息的取值为“0”，可以指示网络设备发送当前的第一系统信息，或者，指示网络设备不发送第一系统信息。需要说明的是，本申请实施例中，第一指示信息的取值在一些实施例中也可以理解为第一字段承载的取值。又例如，如果第一请求消息是Msg3，那么第一指示信息可以承载在公共控制信道中。
作为第一请求消息的第二种实现方式，第一请求消息可以是用于请求SI消息的消息。例如，终端设备向网络设备请求SIB1，可以通过向网络设备请求包含SIB1的SI消息。
这种方式下，第一请求消息可以携带第二编号和第二指示信息。其中，第二编号为系统信息消息的编号。网络设备接收到第一请求消息后，向终端设备发送与第二编号对应的SI消息。例如，如果网络设备为终端设备配置了CSS，网络设备可以广播SI消息。一个SI消息可以包括多个SIB，不同的SI消息包括的SIB也可能有所不同。例如，SI消息1包括SIB2和SIB3；SI消息2包括SIB2、SIB4和SIB5。如果终端设备1需要获取的是SIB4，终端设备2需要获取的是SIB2。这种情况下，网络设备广播SI消息2，终端设备1接收到该SI消息2，可以从中获取所需要的SIB4；终端设备2接收到该SI消息2，可以从中获取所需要的SIB2。这样网络设备不需要为终端设备1和终端设备2各自单独发送第一系统信息，从而节约了网络设备的开销。第二指示信息类似上述第一指示信息，这里不再赘述。
当终端设备需要获取第一系统信息时，第一请求消息可以携带上述的第二编号。不同的终端设备所需要的第一系统信息可能不同，所以对应的第一请求消息携带的第二编号也所有不同。网络设备广播SI消息时，在同一时刻所广播的SI消息有可能包括某个终端设备需要的第一系统信息，有可能不包括某个终端设备需要的第一系统信息。如果终端设备每次都读取网络设备广播的SI消息，显然所获得的SI消息，有些是无用的。为此，网络设备广播SI消息时，可以广播该SI消息包括哪些SIB，以及SI消息的发送位置信息，从而终端设备可以根据自身需要读取对应的SI消息，以节约传输资源的开销。
在一些实施例中，第一请求消息也可以携带比特映射(bitmap)，该bitmap可以用于指示第一请求消息请求的是系统信息块，还是系统信息消息。例如，第一请求消息可以携带第一编号和bitmap，或者，第一请求消息可以携带第二编号和bitmap。例如bitmap占用1bit，当该1bit的值是“0”，则第一请求消息请求的是系统信息块，对应的，当该1bit的值是“1”，则第一请求消息请求的是SI消息；或者，在一些实施例中，当该1bit的值是“1”，则第一请求消息请求的是系统信息块，对应的，当该1bit的值是“0”，则第一请求消息请求的是SI消息。本申请实施例通过bitmap更加清楚地告知网络设备，终端设备请求的是系统信息块还是SI消息。
需要说明的是，如果第一请求消息携带了bitmap，第一请求消息可以不携带第一编号或第二编号。如果第一请求消息不携带第一编号或第二编号，第一编号或第二编号可能是事先约定好的，例如事先约定第一编号是X，第二编号是Y，网络设备接收到第一请求消息，且第一请求消息携带bitmap，则可以根据bitmap的取值向终端设备发送与X对应的系统信息块，或者，网络设备根据bitmap的取值向终端设备发送与Y对应的SI消息。
上述第一种方式和第二种方式可以认为是显式指示方式，除此之外，本申请中的第一请求消息也可以通过隐式方式指示网络设备在第一系统信息发生变化时，发送变化后的第一系统信息。例如第一请求消息的消息类型可以是新定义的，假设第一请求消息的消息类型是类型X，与上述Msg1的消息类型不同，且类型X表示终端设备请求网络设备在第一系统信息发生变化时，向终端设备发送变化后的第一系统信息，相应的，Msg1表示终端 设备向网络设备请求第一系统信息，而不请求网络设备主动向终端设备发送变化后的第一系统信息。这种情况下，如果网络设备确定第一请求消息的消息类型是类型X，则确定终端设备请求网络设备在第一系统信息发生变化时，向终端设备发送变化后的第一系统信息。如果网络设备确定第一请求消息是Msg1，即消息类型不是类型X，则确定终端设备向网络设备请求第一系统信息，而不请求网络设备主动向终端设备发送变化后的第一系统信息。又例如，本申请可以新增加信令，该新增加的信令用于指示网络设备在第一系统信息发生变化时，发送变化后的第一系统信息。其中，上述类型X只是为了说明第一请求消息的消息类型可以是新增加的类型,“X”并不具有指代作用。
在一些实施例中，如果终端设备确定终端设备所在的激活的BWP配置了系统信息CSS，那么终端设备可以确定第一请求消息请求的是SI消息，即第一请求消息中包含一个或者多个SI消息的信息。如果终端设备确定终端设备所在激活的BWP为被配置系统信息CSS，那么终端设备可以确定第一请求消息请求的是SIB，即第一请求消息中包含一个或者多个SIB的信息。
在一些实施例中，网络设备除了向终端设备发送第一系统信息之外，还可以向终端设备发送第一取值，该第一取值可以是第一系统信息包含的SIB的取值标签的取值。例如SIB的取值标签可以是SIB的“systeminfo Value Tag”字段，该第一取值可以是SIB的“systeminfo Value Tag”字段所指示的取值。
示例性的，如果第一请求消息请求的是SIB，那么网络设备在向终端设备发送变化后的SIB时，可以将变化后的SIB的“systeminfo Value Tag”所指示的取值，例如第一取值发送给终端设备。
又一示例性的，如果第一请求消息请求的是SI消息，那么网络设备在向终端设备广播SI消息时，可以将SI消息所包括的一个或多个SIB的“systeminfo Value Tag”所指示的取值分别发送或广播给终端设备。
而终端设备接收该第一取值后，可以根据第一取值存储变化后的SIB。也就是终端设备存储变化后的SIB，还可以将SIB的“systeminfo Value Tag”当前的取值更新为第一取值，并存储该第一取值，以保证终端设备所存储的SIB的“systeminfo Value Tag”所指示的取值与SIB的内容匹配。
在另一些实施例中，终端设备获取来自网络设备的SIB后，可以将对应的SIB的“systeminfo Value Tag”当前的取值执行加1操作；或者，终端设备获取来自网络设备的SI消息后，可以将SI消息中包含的终端设备所请求的SIB的“systeminfo Value Tag”当前的取值执行加1操作，从而获得SIB的“systeminfo Value Tag”的新的取值，例如第一取值。终端设备可以根据第一取值存储变化后的SIB，以保证终端设备所存储的SIB的“systeminfo Value Tag”所指示的取值与SIB的内容匹配。
需要说明的是，在本申请实施例中，网络设备向终端设备发送第一取值并不受终端设备发送第一请求消息的限制。也就是说，网络设备可以基于终端设备向网络设备发送的第一请求消息向终端设备发送第一取值，也可以是基于其他可能的情况向终端设备发送第一取值。网络设备可以将变化后的系统信息以及第一取值同时发送给终端设备，或者，网络设备也可以将变化后的系统信息以及第一取值分别发送给终端设备。
在一些实施例中，第一请求消息还可以包含终端设备的小区无线网络临时标识(cell-radio network temporary identifier，C-RNTI)。如果终端设备向网络设备发送的第一请 求消息不是专用信令，那么网络设备可能不知道该第一请求消息是哪个终端设备发送的。所以如果第一请求消息不是专用信令时，第一请求消息还可以携带C-RNTI，以便网络设备向与C-RNTI对应的终端设备发送变化后的第一系统信息。
在一些实施例中，第一请求消息也可以用于向网络设备请求在第一时长内的发生变化的第一系统信息。例如，终端设备可以在定位期间，向网络设备请求获取用于终端设备定位的第一系统信息，例如posSIB，而不在定位期间，可以不继续网络设备请求获取posSIB，以节约网络设备的开销。
示例性的，第一请求消息可以携带第一时长，以请求向网络设备获取在第一时长内，发生变化的第一系统信息。也就是如果第一系统信息发生变化的动作在第一时长之内，则网络设备向终端设备发送变化后的第一系统信息。沿用上述的例子，第一时长可以是终端设备的定位期间的时长。第一时长可以通过第一时长的起始时刻和第一时长的结束时刻来表征，即第一请求消息可以携带两个时间信息，例如第一时间信息和第二时间信息。第一时间信息可以表示第一时长的起始时刻，相应的，第二时间信息表示第一时长的结束时刻。第一时间信息和第二时间信息均可以是协调世界时(coordinated universal time，UTC)，例如，第一时间信息表示第一UTC，第二时间信息表示第二UTC，第一UTC和第二UTC之间的差值的绝对值就是第一时长。或者，第一时间信息和第二时间信息均可以是子帧的编号或无线帧的编号等。例如，第一时间信息和第二时间信息都是子帧的编号，这两个子帧之间的间隔就是第一时长。又例如，第一时间信息和第二时间信息都是无线帧的编号，这两个无线帧之间的间隔就是第一时长。或者，第一时长可以通过一个起始时刻和一个持续时长来表征，即第一请求消息可以携带一个时间信息和一个持续时间信息。该时间信息可以指示一个时刻，该持续时间信息可以指示一个持续时长，以指示网络设备从这个时刻开始，在这个持续时长内，如果第一系统信息发生变化，则向终端设备发送第一系统信息。
需要说明的是，上述第一时长的实现方式仅是举例示意，本申请对第一时长的具体实现方式不作限制。
S503、网络设备在第一时长后，停止向终端设备发送变化后的第一系统信息。
如果第一请求消息携带第一时长，那么网络设备接收到第一请求消息后，如果在第一时长内，第一系统信息发生变化，网络设备就向终端设备发送变化后的第一系统信息。相应地，终端设备在第一时长内接收来自网络设备的第一系统信息，或者，也可以认为终端设备在第一时长内监测来自网络设备的第一系统信息，而在第一时长之后，不再监测来自网络设备的第一系统信息。而如果网络设备确定系统信息发生变化的时候在第一时长之后，那么网络设备不再向终端设备发送第一系统信息。
相反，如果第一请求消息没有携带第一时长，那么网络设备接收到第一请求消息后，只要第一系统信息发生变化，就会向终端设备发送第一系统信息，而实际上，终端设备可能不是一直需要该第一系统信息。例如终端设备在定位期间，向网络设备请求获取posSIB，而在定位期间之外，终端设备不需要posSIB。因此，终端设备在不再需要第一系统信息时，可以指示网络设备不再向终端设备发送第一系统信息，从而节约了网络设备的开销。
S504、终端设备向网络设备发送第二请求消息。
该第二请求消息可以用于指示网络设备不再向终端设备发送变化后的第一系统信息。网络设备接收到第一请求消息，之后向终端设备发送变化后的第一系统信息，直到接收到第二请求消息，停止向终端设备发送变化后的第一系统信息，以节约网络侧的资源开销， 降低网络设备的能耗。
第二请求消息可以携带第一编号或第二编号。如果第一请求消息携带第一编号，第二请求消息也携带第一编号；而如果第一请求消息携带第二编号，第二请求消息也携带第二编号，以告知网络设备停止向终端设备发送的是第一系统信息。
其中，S504不是必须的，因此在图5中以虚线进行示意。例如如果第一请求消息携带了第一时长，那么终端设备可以不执行S504。需要说明的是，尽管第一请求消息携带了第一时长，终端设备也可能执行S504。
这里需要说明的是，有些场景中，网络设备可以确定终端设需要变化后的第一系统信息，这种情况下，第一请求消息不是必须的，网络设备在第一系统信息变化时，主动向终端设备发送变化后的第一系统信息。但是这种情况下，终端设备如果确定不需要变化后的第一系统信息时，还是可以向网络设备发送第二请求消息。
在一些实施例中，第一请求消息和第二请求消息可以是同一个消息。当第一请求消息和第二请求消息是同一个消息时，该消息可以包括一个指示信息，该指示信息可以用于指示网络设备发送第一系统信息，或者该指示信息用于指示网络设备不再发送第一系统信息。例如，该指示信息可以承载在这个消息的一个字段中，该指示信息可以占用1个bit，当该指示信息的取值为“0”，可以指示网络设备在第一系统信息发生变化时，发送变化后的第一系统信息；相应地，当该指示信息的取值为“1”，可以指示网络设备不发送第一系统信息。在其它的实施例中，当该指示信息的取值为“1”，可以指示网络设备在第一系统信息发生变化时，发送变化后的第一系统信息；相应地，当该指示信息的取值为“0”，可以指示网络设备不发送第一系统信息。
示例性的，请参见图6，为终端设备请求获取posSIB的示意图。如果第一请求消息没有携带第一时长，且终端设备在定位期间需要posSIB，那么终端设备可以向网络设备在定位期间的起始时刻发送一次第一请求消息，直到终端设备不再需要posSIB，则可以向网络设备发送第二请求消息，即终端设备在定位期间的结束时刻发送第二请求消息。在图6中第一请求消息用posSIBs request进行示意，第二请求消息用Cancel posSIBs request进行示意。而网络设备接收到第一请求消息之后，只要确定posSIB发生变化，就将变化后的posSIB发送给终端设备，直到网络设备接收到第二请求消息之后，不再继续向终端设备发送变化后的posSIB。可见，如图6所示，在终端设备的定位期间，posSIB发生了5次变化，但是终端设备只需要请求一次posSIB，网络设备就会将5次发生变化的posSIB发送给终端设备，相对于目前终端设备需要请求5次posSIB来说，节省了终端设备的开销。
又一示例性的，请参见图7，为终端设备请求获取posSIB的示意图。如果第一请求消息携带第一时长，且终端设备的定位期间可以是第一时长。如果终端设备在定位期间需要posSIB，那么终端设备可以向网络设备在定位期间的起始时刻发送一次第一请求消息。而网络设备接收到第一请求消息之后，只要确定posSIB发生变化就向终端设备发送posSIB，直到第一时长的结束时刻，网络设备停止向终端设备发送posSIB。可见，如图7所示，在终端设备的定位期间，posSIB发生了5次变化，但是终端设备只需要请求一次posSIB，相对于目前终端设备需要请求5次posSIB来说，节省了终端设备的开销。且，终端设备不需要另外向网络设备发送第二请求消息，有助于节约终端设备的开销。
另外，可能存在多个终端设备向网络设备发送第一请求消息，如果多个终端设备向网络设备请求获取第一系统信息，网络设备可以通过广播方式发送SI消息，从而可以有效降 低网络设备的信令开销。在一些实施例中，第一请求消息可以是RRC信令，当网络设备确定通过广播方式或单播方式发送SI消息，网络设备也可以向终端设备发送一个确认(Acknowledgement，ACK)消息，该ACK消息可以是一个物理层消息、MAC层消息或者RRC层消息。如果网络设备确定通过广播方式发送SI消息，该ACK消息可以告知终端设备，网络设备已接收到第一请求消息，并通过广播方式发送SI消息。如果网络设备确定通过单播方式发送SI消息，该ACK消息可以告知终端设备，网络设备已接收到第一请求消息，并通过单播方式发送SI消息。
如果这多个终端设备发送的第一请求消息携带第一时长，不同终端设备的第一请求消息对应的第一时长可能也不同。例如，存在3个终端设备向网络设备发送第一请求消息，终端设备1发送的第一请求消息1携带的第一时长为时长1，终端设备2发送的第一请求消息2携带的第一时长为时长2，终端设备3发送的第一请求消息3携带的第一时长为时长3，时长1、时长2和时长3均不相同。当网络设备接收到多个第一请求消息之后，网络设备可以选择在什么时候停止广播SI消息。例如，网络设备可以在第一时长之后，可以继续广播SI消息，直到到达第二时长的结束时刻。其中，第二时长是多个第一请求消息携带的多个第一时长中结束时刻最晚的时长。沿用上述的例子，如果时长1是时长1、时长2和时长3中结束时刻最早的时长，而时长3是时长1、时长2和时长3中结束时刻最晚的时长，那么终端设备接收到第一请求消息1、第一请求消息2和第一请求消息3之后，可以在时长1之后，继续广播SI消息，直到时长3的结束时刻，网络设备停止广播SI消息。
这种方式下，相应地，终端设备向网络设备发送的第二请求消息也可以携带第二编号，以告知网络设备停止发送与该第二编号对应的SI消息。
由于网络设备广播SI消息，对于有的终端设备来说，可能接收的从SI消息获取的第一系统信息已经过期。例如第一系统信息为posSIB，posSIB的有效期小于网络设备广播系统信息的周期，那么终端设备接收的posSIB有可能过期。这种情况下，如果终端设备确定接收的第一系统信息过期，终端设备可以直接读取网络设备的广播，以获取最新的第一系统信息。
一种可能的情形中，终端设备请求获取的posSIB，那么终端设备确定获取的posSIB是否过期可以根据posSIB的标识，例如area specific来确定。为了便于理解，下面以终端设备定位的过程为例介绍终端设备确定获取的posSIB是否过期。
请参见图8，终端设备定位的过程包括如下步骤：
步骤S801、定位服务器向网络设备发送定位辅助信息。
该定位辅助信息用于终端设备的定位。定位服务器发送定位辅助信息的同时，可以指示该定位辅助信息的标识，例如area specific或cell specific。
在一些实施例中，如果定位服务器指示定位辅助信息的标识为area specific，定位服务器还可以指示该定位辅助信息的系统信息区域标识(SI area ID)。
步骤S802、网络设备向终端设备发送第一系统信息。
网络设备接收到定位辅助信息之后，可以通过对应的posSIB发送定位辅助信息。具体的，网络设备可以向终端设备发送SIB1，该SIB1包括posSIB的调度信息，并包括指示posSIB的标识信息，用于指示posSIB的标识是area specific或cell specific。
在一些实施例中，网络设备收到定位辅助信息时，如果确定所述定位辅助信息的SI area  ID，与当前小区广播的SI area ID不一致时，可以将定位辅助信息对应的posSIB标识更新为cell specific。
步骤S803、终端设备存储用于定位的第一系统信息。
终端设备根据SIB1获取posSIB，如果确定posSIB的标识是area specific，那么终端设备存储posSIB时，还需要存储主PLMN以及SI area标识。这样如果posSIB的标识是area specific，终端设备在移动到新的小区之后，可以通过判断小区的主PLMN以及SI area标识来判断存储的posSIB是否有效。
这样终端设备就可以在确定posSIB无效时，才重新读取网络设备下发的posSIB，从而降低了终端设备频繁读取系统信息的开销。
本申请通过上述方案，在本申请实施例中，第一请求消息可以请求网络设备发送变化后的第一系统信息，也就是说，即使第一系统信息发生了变化，终端设备也无需再次向网络设备发送请求，网络设备可以在第一系统信息发生变化时主动将变化后的第一系统信息发送给终端设备，从而减少了终端设备的请求次数，减少了终端设备获取系统信息的开销，也降低了终端设备的能耗。
上述本申请提供的实施例中，分别从网络设备、终端、以及网络设备和终端之间交互的角度对本申请实施例提供的方法进行了介绍。为了实现上述本申请实施例提供的方法中的各功能，网络设备和终端可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
下面结合附图介绍本申请实施例中用来实现上述方法的通信装置。因此，上文中的内容均可以用于后续实施例中，重复的内容不再赘述。
图9示出了一种通信装置900的结构示意图。其中，通信装置900能够实现本申请实施例提供的方法中终端设备的功能；通信装置900也可以是能够支持终端设备实现本申请实施例提供的方法中对应的功能的装置。通信装置900可以是硬件结构、软件模块、或硬件结构加软件模块。通信装置900可以由芯片系统实现。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
通信装置900可以包括处理单元901和收发单元902。
处理单元901可以控制收发单元902用于执行图5所示的实施例中的S501、S5021、S5023以及S503，和/或用于支持本文所描述的技术的其它过程。
收发单元902用于通信装置900和其它模块进行通信，其可以是电路、器件、接口、总线、软件模块、收发器或者其它任意可以实现通信的装置。
收发单元902可以用于执行图5所示的实施例中的由收发单元902所执行的步骤，和/或用于支持本文所描述的技术的其它过程。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
图10示出了一种通信装置1000的结构示意图。其中，通信装置1000能够实现本申请实施例提供的方法中网络设备的功能；通信装置1000也可以是能够支持网络设备实现本申请实施例提供的方法中网络设备的功能的装置。通信装置1000可以是硬件结构、软件模块、或硬件结构加软件模块。通信装置1000可以由芯片系统实现。本申请实施例中，芯片系统 可以由芯片构成，也可以包含芯片和其他分立器件。
通信装置1000可以包括处理单元1001和收发单元1002。
收发单元1002用于通信装置1000和其它模块进行通信，其可以是电路、器件、接口、总线、软件模块、收发器或者其它任意可以实现通信的装置。
收发单元1002可以用于执行图5所示的实施例中的S501、S5021、S5023以及S503和/或用于支持本文所描述的技术的其它过程。
处理单元1001可以用于执行图5所示的实施例中的S5022以及S504，以及控制收发单元1002执行图5所示的实施例中由收发单元1002所执行的步骤，和/或用于支持本文所描述的技术的其它过程。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
如图11所示为本申请实施例提供的通信装置1100，其中，通信装置1100可以是终端设备，能够实现本申请实施例提供的方法中终端设备的功能，或者，通信装置1100可以是网络设备，能够实现本申请实施例提供的方法中网络设备的功能；通信装置1100也可以是能够支持终端设备实现本申请实施例提供的方法中对应的功能的装置，或者能够支持网络设备实现本申请实施例提供的方法中对应的功能的装置。其中，该通信装置1100可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
在硬件实现上，上述收发单元902或者收发单元1002可以为收发器，收发器集成在通信装置1100中构成通信接口1110。
通信装置1100包括至少一个处理器1120，用于实现或用于支持通信装置1100实现本申请实施例提供的方法中终端设备的功能。示例性地，处理器1120可以生成要发送给网络设备的第一请求消息以及第二请求消息，并控制终端设备向网络设备发送第一请求消息和/或第二请求消息，具体参见方法示例中的详细描述，此处不做赘述。
通信装置1100还可以包括至少一个存储器1130，用于存储程序指令和/或数据。存储器1130和处理器1120耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器1120可能和存储器1130协同操作。处理器1120可能执行存储器1130中存储的程序指令。所述至少一个存储器中的至少一个可以包括于处理器中。
通信装置1100还可以包括通信接口1110，用于通过传输介质和其它设备进行通信，从而用于通信装置1100中的装置可以和其它设备进行通信。示例性地，当该通信装置为终端设备时，该其它设备为网络设备；或者，当该通信装置为网络设备时，该其它设备为终端设备。处理器1120可以利用通信接口1110收发数据。通信接口1110具体可以是收发器。
本申请实施例中不限定上述通信接口1110、处理器1120以及存储器1130之间的具体连接介质。本申请实施例在图11中以存储器1130、处理器1120以及通信接口1110之间通过总线1140连接，总线在图11中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图11中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，处理器1120可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是 微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
在本申请实施例中，存储器1130可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于存储程序指令和/或数据。
需要说明的是，上述实施例中的通信装置可以是终端设备也可以是电路，也可以是应用于终端设备中的芯片或者其他具有上述终端设备功能的组合器件、部件等。当通信装置是终端设备时收发单元可以是收发器，可以包括天线和射频电路等，处理模块可以是处理器，例如：中央处理单元(central processing unit，CPU)。当通信装置是具有上述终端设备功能的部件时，收发单元可以是射频单元，处理模块可以是处理器。当通信装置是芯片系统时，收发单元可以是芯片系统的输入输出接口、处理模块可以是芯片系统的处理器。
图12示出了一种简化的通信装置的结构示意图。便于理解和图示方便，图12中，通信装置以网络设备作为例子。该基站可应用于如图4所示的系统中，可以为图4中的接入网设备，执行上述方法实施例中网络设备的功能。网络设备120可包括一个或多个射频单元，如远端射频单元(remote radio unit,RRU)1210和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)1220。所述RRU 1210可以称为通信模块，与图10中的收发单元1002对应，可选地，该通信模块还可以称为收发机、收发电路、或者收发器等等，其可以包括至少一个天线1211和射频单元1212。所述RRU 1210部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端设备发送指示信息。所述BBU 1220部分主要用于进行基带处理，对基站进行控制等。所述RRU 1210与BBU 1220可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 1120为基站的控制中心，也可以称为处理模块，可以与图10中的处理单元1001对应，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理模块)可以用于控制基站执行上述方法实施例中关于网络设备的操作流程，例如，生成上述指示信息等。
在一个示例中，所述BBU 1220可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 1220还包括存储器1221和处理器1222。所述存储器1221用以存储必要的指令和数据。所述处理器1222用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器1221和处理器1222可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
图13示出了一种简化的通信装置的结构示意图。便于理解和图示方便，图13中，通信装置以手机作为例子。如图13所示，终端设备包括处理器、存储器、射频电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对终端设备进行控制，执行软件程序，处理软件程序的数据等。存储器主要用于存储软件程序和数据。 射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。需要说明的是，有些种类的终端设备可以不具有输入输出装置。
当需要发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端装置时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。为便于说明，图13中仅示出了一个存储器和处理器。在实际的终端设备产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限制。
在本申请实施例中，可以将具有收发功能的天线和射频电路视为终端设备的收发单元，将具有处理功能的处理器视为终端设备的处理单元。如图13所示，终端设备包括收发单元1310和处理单元1320。收发单元也可以称为收发器、收发机、收发装置等。处理单元也可以称为处理器，处理单板，处理模块、处理装置等。可选的，可以将收发单元1310中用于实现接收功能的器件视为接收单元，将收发单元1310中用于实现发送功能的器件视为发送单元，即收发单元1310包括接收单元和发送单元。收发单元有时也可以称为收发机、收发器、或收发电路等。接收单元有时也可以称为接收机、接收器、或接收电路等。发送单元有时也可以称为发射机、发射器或者发射电路等。
应理解，收发单元1310用于执行上述方法实施例中终端装置侧的发送操作和接收操作，处理单元1320用于执行上述方法实施例中终端装置上除了收发操作之外的其他操作。
例如，在一种实现方式中，收发单元1310可以用于执行图5所示的实施例中的S501、S5021、S5023以及S503，和/或用于支持本文所描述的技术的其它过程。处理单元1220，可以用于执行图5所示的实施例中的由收发单元1310所执行的步骤，和/或用于支持本文所描述的技术的其它过程。
当该终端装置为芯片时，该芯片包括收发单元和处理单元。其中，收发单元可以是输入输出电路、通信接口；处理单元为该芯片上集成的处理器或者微处理器或者集成电路。
本实施例中，可以参照图14所示的设备。作为一个例子，该设备可以完成类似于图13中处理单元1320的功能。在图14中，该设备包括处理器1410，发送数据处理器1420，接收数据处理器1430。上述实施例中的处理单元901或处理单元1001可以是图14中的该处理器1410，并完成相应的功能。上述实施例中的处理单元901或处理单元1001可以是图14中的发送数据处理器1420，和/或接收数据处理器1430。虽然图14中示出了信道编码器、信道解码器，但是可以理解这些模块并不对本实施例构成限制性说明，仅是示意性的。
图15示出本实施例的另一种形式。终端装置1500中包括调制子系统、中央处理子系统、周边子系统等模块。本实施例中的终端装置可以作为其中的调制子系统。具体的，该调制子系统可以包括处理器1503，接口1504。其中处理器1503完成上述处理单元901或处理单元1001的功能，接口1504完成上述收发单元902或收发单元1002的功能。作为另一种变形，该调制子系统包括存储器1506、处理器1503及存储在存储器1506上并可在 处理器上运行的程序，该处理器1503执行该程序时实现上述方法实施例中第一终端装置或第二终端装置的方法。需要注意的是，所述存储器1506可以是非易失性的，也可以是易失性的，其位置可以位于调制子系统内部，也可以位于处理装置1500中，只要该存储器1506可以连接到所述处理器1503即可。
本申请实施例还提供一种通信系统，具体的，通信系统包括终端设备和网络设备，或者还可以包括更多个终端设备和网络设备。
所述终端设备和网络设备分别用于实现上述图5或图8相关设备的功能。具体请参考上述方法实施例中的相关描述，这里不再赘述。
本申请实施例中还提供一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行图5或图8中终端设备和网络设备执行的方法。
本申请实施例中还提供一种计算机程序产品，包括指令，当其在计算机上运行时，使得计算机执行图5或图8中终端设备和网络设备执行的方法。
本申请实施例提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器，用于实现前述方法中终端设备和网络设备的功能。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
本申请实施例提供的方法中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、网络设备、用户设备或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，简称DSL)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机可以存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，数字视频光盘(digital video disc，简称DVD))、或者半导体介质(例如，SSD)等。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (38)

  1. 一种系统信息的获取方法，其特征在于，包括：
    向网络设备发送第一请求消息，所述第一请求消息用于请求来自网络侧的变化后的第一系统信息；
    接收来自所述网络设备的所述第一系统信息。
  2. 如权利要求1所述的方法，其特征在于，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
  3. 如权利要求1或2所述的方法，其特征在于，所述方法还包括：
    向所述网络设备发送第二请求消息，所述第二请求消息用于指示所述网络设备不再向通信装置发送变化后的所述第一系统信息。
  4. 如权利要求1-3任一所述的方法，其特征在于，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
  5. 如权利要求1-3任一所述的方法，其特征在于，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第一系统信息包含所述系统信息消息，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
  6. 如权利要求2-5任一所述的方法，其特征在于，所述方法还包括：
    在所述第一时长内，接收来自所述网络设备的变化后的所述第一系统信息。
  7. 如权利要求4-6任一所述的方法，其特征在于，所述方法还包括：
    接收来自所述网络设备的第一取值，以及将所述第一系统信息包含的系统信息块的取值标签的当前取值更新为所述第一取值；或者，
    将所述第一系统信息包含的系统信息块的取值标签的当前取值执行加1操作。
  8. 如权利要求1-7任一所述的方法，其特征在于，所述第一系统信息用于通信装置的定位。
  9. 一种系统信息的发送方法，其特征在于，包括：
    网络设备接收来自通信装置的第一请求消息，所述第一请求消息用于请求来自网络侧的变化后的第一系统信息；
    所述网络设备响应于所述第一请求消息，在所述第一系统信息发生变化时，向所述通信装置发送所述第一系统信息。
  10. 如权利要求9所述的方法，其特征在于，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
  11. 如权利要求9或10所述的方法，其特征在于，所述方法还包括：
    所述网络设备接收来自所述通信装置的第二请求消息，所述第二请求消息用于指示所述网络设备不再向所述通信装置发送变化后的所述第一系统信息。
  12. 如权利要求9-11任一所述的方法，其特征在于，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含在所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
  13. 如权利要求9-11任一所述的方法，其特征在于，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
  14. 如权利要求13所述的方法，其特征在于，所述网络设备响应于所述第一请求消息，在所述第一系统信息发生变化时，向所述通信装置发送所述第一系统信息，包括：
    所述网络设备向所述通信装置发送与所述第二编号对应的系统信息消息。
  15. 如权利要求13所述的方法，其特征在于，所述方法还包括：
    向所述通信装置发送第一取值，所述第一取值为所述第一系统信息包含的系统信息块的取值标签的取值。
  16. 如权利要求9-14任一所述的方法，其特征在于，所述第一系统信息用于所述通信装置的定位。
  17. 如权利要求10-15任一所述的方法，其特征在于，所述方法还包括：
    所述网络设备在所述第一时长后，不发送变化后的所述第一系统信息；或者，
    所述网络设备在所述第一时长后，继续发送变化后的所述第一系统信息，直到到达第二时长的结束时刻，其中，所述网络设备接收了来自多个通信装置的用于请求所述系统信息的多个请求消息，所述通信装置是所述多个通信装置中的一个，所述多个请求消息中的至少一个请求消息携带了至少一个时长，所述第一时长和所述第二时长属于所述至少一个时长，且所述第二时长是所述至少一个时长中结束时刻最晚的时长。
  18. 一种通信装置，其特征在于，包括收发单元和处理单元，其中：
    所述收发单元，用于在处理单元的控制下向网络设备发送第一请求消息，所述第一请求消息用于请求来自网络侧的变化后的第一系统信息；
    在处理单元的控制下，接收来自所述网络设备的所述第一系统信息。
  19. 如权利要求18所述的通信装置，其特征在于，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
  20. 如权利要求18或19所述的通信装置，其特征在于，所述收发单元还用于：
    向所述网络设备发送第二请求消息，所述第二请求消息用于指示所述网络设备不再向所述通信装置发送变化后的所述第一系统信息。
  21. 如权利要求18-20任一所述的通信装置，其特征在于，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
  22. 如权利要求18-20任一所述的通信装置，其特征在于，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第一系统信息包含所述系统信息消息，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
  23. 如权利要求18-22任一所述的通信装置，其特征在于，所述收发单元还用于：
    在所述第一时长内，接收来自所述网络设备的变化后的所述第一系统信息。
  24. 如权利要求21-23任一所述的通信装置，其特征在于，所述收发单元还用于：接收来自所述网络设备的第一取值，所述处理单元还用于：将所述第一系统信息包含的系统信息块的取值标签的当前取值更新为所述第一取值；或者，
    所述处理单元用于将所述第一系统信息包含的系统信息块的取值标签的当前取值执行加1操作。
  25. 如权利要求18-23任一所述的通信装置，其特征在于，所述第一系统信息用于所述通信装置的定位。
  26. 一种网络设备，其特征在于，包括收发单元和处理单元，其中：
    所述收发单元，用于在处理单元的控制下，接收来自通信装置的第一请求消息，所述第一请求消息用于请求来自网络侧的变化后的第一系统信息；
    所述处理单元，用于响应于所述第一请求消息，在所述第一系统信息发生变化时，控制所述收发单元向所述通信装置发送所述第一系统信息。
  27. 如权利要求26所述的网络设备，其特征在于，所述第一请求消息携带第一时长，其中，所述第一系统信息在所述第一时长内发生变化。
  28. 如权利要求26或27所述的网络设备，其特征在于，所述收发单元还用于：
    接收来自所述通信装置的第二请求消息，所述第二请求消息用于指示所述网络设备不再向所述通信装置发送变化后的所述第一系统信息。
  29. 如权利要求26-28任一所述的网络设备，其特征在于，所述第一请求消息携带第一编号和第一指示信息，所述第一编号为系统信息块的编号，所述第一系统信息包含在所述系统信息块，所述第一指示信息用于指示所述网络设备发送变化后的所述第一系统信息。
  30. 如权利要求26-28任一所述的网络设备，其特征在于，所述第一请求消息携带第二编号和第二指示信息，所述第二编号为系统信息消息的编号，所述第二指示信息用于指示所述网络设备发送所述系统信息消息。
  31. 如权利要求30所述的网络设备，其特征在于，所述处理单元响应于所述第一请求消息，在所述第一系统信息发生变化时，控制所述收发单元向所述通信装置发送所述第一系统信息时，具体用于：
    所述处理单元控制所述收发单元向所述通信装置发送与所述第二编号对应的系统信息消息。
  32. 如权利要求30所述的网络设备，其特征在于，所述收发单元还用于：
    向所述通信装置发送第一取值，所述第一取值为所述第一系统信息包含的系统信息块的取值标签的取值。
  33. 如权利要求27-32所述的网络设备，其特征在于，所述第一系统信息用于所述通信装置的定位。
  34. 如权利要求28-33所述的网络设备，其特征在于，
    所述处理单元，还用于在所述第一时长后，控制所述收发单元不发送变化后的所述第一系统信息；或者，
    所述处理单元，还用于在所述第一时长后，控制所述收发单元继续发送变化后的所述第一系统信息，直到到达第二时长的结束时刻，其中，所述收发单元接收了来自多个通信装置的用于请求所述系统信息的多个请求消息，所述通信装置是所述多个通信装置中的一个，所述多个请求消息中的至少一个请求消息携带了至少一个时长，所述第一时长和所述第二时长属于所述至少一个时长，且所述第二时长是所述至少一个时长中结束时刻最晚的时长。
  35. 一种通信装置，其特征在于，所述通信装置包括处理器和存储器，所述存储器用于存储计算机程序，所述处理器用于执行存储在所述存储器上的计算机程序，使得所述装置执行如权利要求1～8或9～17中任一项所述的通信方法。
  36. 一种通信系统，其特征在于，包括如权利要求18～25之一的通信装置，和如权利要求26～34之一的网络设备。
  37. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机 程序，所述计算机程序当被计算机执行时，使所述计算机执行如权利要求1～8或9～17中任意一项所述的通信方法。
  38. 一种计算机程序产品，其特征在于，所述计算机程序产品存储有计算机程序，所述计算机程序当被计算机执行时，使所述计算机执行如权利要求1～8或9～17中任意一项所述的通信方法。
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