WO2021087887A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2021087887A1
WO2021087887A1 PCT/CN2019/116333 CN2019116333W WO2021087887A1 WO 2021087887 A1 WO2021087887 A1 WO 2021087887A1 CN 2019116333 W CN2019116333 W CN 2019116333W WO 2021087887 A1 WO2021087887 A1 WO 2021087887A1
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Prior art keywords
terminal device
system information
information
random access
network device
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PCT/CN2019/116333
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English (en)
French (fr)
Inventor
郭英昊
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华为技术有限公司
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Priority to PCT/CN2019/116333 priority Critical patent/WO2021087887A1/zh
Publication of WO2021087887A1 publication Critical patent/WO2021087887A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a communication method and device.
  • a network device can send system information (SI) to a terminal device to notify the terminal device of various information about the system, for example, the network information of the cell where the terminal device is located, the information of the registered area, and the public Channel information, and other cell information, etc.
  • SI system information
  • SI can be divided into two types according to the way the network device sends the SI, namely, necessary system information and non-essential system information.
  • necessary system information is system information sent by network equipment through periodic broadcasts, such as cell selection and initial access information
  • non-essential system information is system information provided to terminal equipment based on the needs of terminal equipment, such as for positioning system message.
  • terminal devices in an idle state or terminal devices in an inactive state are mainly used to request non-essential system information.
  • V2X vehicle to everything
  • terminal devices in a connected state also need to request non-essential system information, such as requesting system information for positioning. Therefore, how to obtain non-essential system information for connected terminal devices still needs further research.
  • the present application provides a communication method and device, which are used to enable terminal devices in a connected state to obtain non-essential system information.
  • the embodiments of the present application provide a communication method, which may be applied to a terminal device, or may also be applied to a chip inside the terminal device.
  • the identification of the terminal device may be acquired first, and then a request message may be sent to the network device.
  • the request message includes the identification of the terminal device and first information, and the first information is used to indicate the system information requested by the terminal device; And then receive the system information from the network equipment.
  • obtaining the identity of the terminal device can be understood as establishing a connection with the network device, or the terminal device enters or is in a connected state.
  • the terminal device in the connected state can obtain system information by sending a request message to the network device; on the other hand, since the request message sent by the terminal device to the network device includes the identification of the terminal device, the network device can According to the identification of the terminal device, the system information requested by the terminal device is sent in a unicast manner to avoid the problem that the terminal device may not be able to receive the system information when the system information is sent in a broadcast manner.
  • receiving the system information from the network device includes: receiving first downlink control information from the network device for scheduling system information, and the first downlink control information passes through the terminal device Identification scrambling; and further receiving system information from the network device according to the first downlink control information.
  • receiving system information from a network device includes: receiving first downlink control information from the network device, where the first downlink control information is scrambled by an identifier of the terminal device; and then the resources indicated by the first downlink control information On, receive system information from network devices.
  • the terminal device can receive the first downlink control information through the blind detection process based on the identification of the terminal device.
  • Other terminal devices because they do not know the identity of the terminal device, cannot receive the first downlink control information, and therefore cannot receive the system information on the resource indicated by the first downlink control information, thereby achieving the implementation in the above manner.
  • the first information includes multiple bits, each bit corresponds to a system information block or corresponds to a system message, and the value of the bit is used to indicate whether the corresponding system information block or system message is request.
  • the requested system information block or system message can be clearly indicated, and the implementation is relatively simple and convenient.
  • the first information further includes indication information, and the indication information is used to indicate the granularity of the system information corresponding to the bit.
  • the granularity of the system information corresponding to the bit is indicated by the indication information, thereby making the indication method more flexible.
  • the first information is carried in the MAC CE.
  • sending request information to a network device includes: sending a random access request to the network device; receiving a random access response of the random access request, the random access response includes an uplink authorization; The device sends a request message.
  • the method further includes: receiving second downlink control information for scheduling contention resolution messages from the network device, the second downlink control information being scrambled by the identification of the terminal device or the TC-RNTI of the terminal device ; According to the second downlink control information, receive a contention resolution message.
  • the random access response further includes a timing advance command; the method further includes: updating the timing advance of the terminal device according to the timing advance command, and starting or restarting a timer. Before the timer expires, the updated timing advance is valid.
  • the terminal device when it requests system information through the third message of the random access process, after the contention is resolved successfully, the terminal device usually no longer maintains the timing advance, such as stopping the timing Device.
  • the terminal device can continue to maintain the timing advance, that is, the timing advance is always valid before the timer expires, which can effectively avoid the timing advance.
  • the amount of data is invalid and affects the uplink data transmission.
  • the identifier of the terminal device is the C-RNTI of the terminal device.
  • the embodiments of the present application provide a communication method, which can be applied to a network device, or can also be applied to a chip inside the network device.
  • a request message from a terminal device is received, the terminal device is in a connected state, and the request message includes an identifier of the terminal device and first information, and the first information is used to instruct the terminal device to request ⁇ system information; and then send the system information according to the identification of the terminal device.
  • the terminal device in the connected state can obtain system information by sending a request message to the network device; on the other hand, since the request message includes the identification of the terminal device, the network device can use the identification of the terminal device to obtain system information.
  • the system information requested by the terminal device is sent in unicast mode to avoid the problem that the terminal device may not be able to receive the system information when the system information is sent in the broadcast mode.
  • sending the system information according to the identifier of the terminal device includes: sending first downlink control information for scheduling the system information, and the first downlink control information passes through all The identification of the terminal device is scrambled; the system information is sent.
  • sending the system information according to the identification of the terminal device includes: sending first downlink control information, the first downlink control information being scrambled by the identification of the terminal device; The system information is sent on the resource.
  • the terminal device can receive the first downlink control information through the blind detection process based on the identification of the terminal device.
  • Other terminal devices because they do not know the identity of the terminal device, cannot receive the first downlink control information, and therefore cannot receive system information on the resource indicated by the first downlink control information. Therefore, the network device uses The identifier of the terminal device scrambles the first downlink control information, so that the system information is unicasted to the terminal device.
  • the first information includes multiple bits, each bit corresponds to a system information block or corresponds to a system message, and the value of the bit is used to indicate whether the corresponding system information block or system message is request.
  • the first information further includes indication information, and the indication information is used to indicate the granularity of the system information corresponding to the bit.
  • the first information is carried in the MAC CE.
  • receiving the request message from the terminal device includes: receiving a random access request from the terminal device; sending a random access response of the random access request, the random access The response includes an uplink authorization; the request message sent by the terminal device using the uplink authorization is received.
  • the method further includes: sending second downlink control information for scheduling contention resolution messages, where the second downlink control information passes through the identification of the terminal device or the TC- of the terminal device. RNTI scrambling; sending the contention resolution message.
  • the random access response further includes a timing advance command; the method further includes: starting or restarting a timer.
  • the identifier of the terminal device is the C-RNTI of the terminal device.
  • the embodiments of the present application provide a communication method, which may be applied to a terminal device, or may also be applied to a chip inside the terminal device.
  • a connection can be established with the network device first, and a request message can be sent to the network device.
  • the request message is used to request system information, and the request message is carried on the random access resource corresponding to the system information;
  • the response message sent by the request message includes a timing advance command; the timing advance of the terminal device is updated according to the timing advance command, and the timer is started or restarted; and the system information sent by the network device is received.
  • the terminal device sends a request message to the network device, and the request information is carried on the random access resource corresponding to the requested system information, and receives a response message sent by the network device.
  • the response message includes a timing advance command, so that the terminal device The timing advance can be updated in time to ensure normal uplink data transmission.
  • the embodiments of the present application provide a communication method, which can be applied to a network device, or can also be applied to a chip inside the network device.
  • the method includes: establishing a connection with a terminal device, and receiving a request message sent by the terminal device, the request message is used to request system information, and the request message is carried on a random access resource corresponding to the system information;
  • the terminal device sends a response message, the response message includes a timing advance command; and, system information is sent.
  • the response message sent by the network device includes the timing advance command, so that the terminal device can update the timing advance in time to ensure normal uplink data transmission.
  • the present application provides a communication device.
  • the communication device may be a terminal device or a chip set inside the terminal device.
  • the communication device has the function of implementing the first aspect or the third aspect.
  • the communication device includes a module or unit or means corresponding to the steps involved in the first or third aspect.
  • the function Or the unit or means can be realized by software, or by hardware, and can also be realized by hardware executing corresponding software.
  • the communication device includes a processing unit and a communication unit.
  • the communication unit can be used to send and receive signals to achieve communication between the communication device and other devices.
  • the communication unit is used to receive System information of the network equipment; the processing unit can be used to perform some internal operations of the communication device.
  • the functions performed by the processing unit and the communication unit may correspond to the steps involved in the first aspect or the third aspect described above.
  • the communication device includes a processor, and may also include a transceiver.
  • the transceiver is used to send and receive signals, and the processor executes program instructions to complete any of the above-mentioned first or third aspects.
  • the communication device may further include one or more memories, and the memories are used for coupling with the processor.
  • the one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application.
  • the memory may store necessary computer programs or instructions for realizing the functions related to the first aspect or the third aspect.
  • the processor can execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device realizes any of the possible designs or implementations of the first aspect or the third aspect. method.
  • the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for realizing the functions involved in the first aspect or the third aspect.
  • the processor can execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device realizes any of the possible designs or implementations of the first aspect or the third aspect. method.
  • the communication device includes at least one processor and an interface circuit, where at least one processor is used to communicate with other devices through the interface circuit, and perform any of the above-mentioned first or third aspects.
  • the present application provides a communication device.
  • the communication device may be a network device or a chip set inside the network device.
  • the communication device is capable of implementing the functions related to the second aspect or the fourth aspect.
  • the communication device includes modules or units or means corresponding to the steps related to the second aspect or the fourth aspect, and the functions or units Or means can be realized by software, or by hardware, or by hardware executing corresponding software.
  • the communication device includes a processing unit and a communication unit.
  • the communication unit can be used to send and receive signals to achieve communication between the communication device and other devices.
  • the communication unit is used to communicate with the terminal.
  • the device sends system information; the processing unit can be used to perform some internal operations of the communication device.
  • the functions performed by the processing unit and the communication unit may correspond to the steps involved in the second aspect or the fourth aspect described above.
  • the communication device includes a processor, and may also include a transceiver, where the transceiver is used to send and receive signals, and the processor executes program instructions to complete any of the above-mentioned second or fourth aspects.
  • the communication device may further include one or more memories, and the memories are used for coupling with the processor.
  • the one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application.
  • the memory may store necessary computer programs or instructions for realizing the functions related to the second aspect or the fourth aspect.
  • the processor can execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device realizes any of the possible designs or implementations of the second aspect or the fourth aspect. method.
  • the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for realizing the functions related to the second aspect or the fourth aspect.
  • the processor can execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device realizes any of the possible designs or implementations of the second aspect or the fourth aspect. method.
  • the communication device includes at least one processor and an interface circuit, where at least one processor is used to communicate with other devices through the interface circuit, and perform any of the above-mentioned second or fourth aspects.
  • the present application provides a computer-readable storage medium in which computer-readable instructions are stored.
  • the computer reads and executes the computer-readable instructions, the computer executes the first aspects to Any possible design method of the fourth aspect.
  • this application provides a computer program product, which when a computer reads and executes the computer program product, causes the computer to execute any one of the possible design methods in the first to fourth aspects.
  • the present application provides a chip that includes a processor, and the processor is coupled with a memory, and is configured to read and execute a software program stored in the memory to implement the first to fourth aspects described above. Any one of the possible design methods.
  • FIG. 1 is a schematic diagram of a network architecture to which an embodiment of this application is applicable;
  • FIG. 2 is a schematic diagram of another network architecture to which the embodiments of this application are applicable;
  • FIG. 3 is a schematic diagram of another network architecture to which the embodiments of this application are applicable.
  • FIG. 4 is a schematic diagram of a random access process provided by an embodiment of this application.
  • FIG. 5 is a schematic diagram of another random access process provided by an embodiment of this application.
  • FIG. 6 is a schematic diagram of uplink synchronization provided by an embodiment of the application.
  • FIG. 7 is a schematic diagram of a flow corresponding to the communication method provided in Embodiment 1 of this application.
  • Figure 8a is a schematic diagram of a format of a MAC CE carrying first information provided by an embodiment of this application;
  • FIG. 8b is a schematic diagram of another format of the MAC CE carrying the first information provided by an embodiment of this application.
  • FIG. 8c is a schematic diagram of another format of a MAC CE carrying first information provided by an embodiment of this application.
  • FIG. 9 is a schematic flowchart corresponding to the communication method provided in the second embodiment of the application.
  • FIG. 10 is a possible exemplary block diagram of a device involved in an embodiment of this application.
  • FIG. 11 is a schematic structural diagram of a terminal device provided by an embodiment of this application.
  • FIG. 12 is a schematic structural diagram of a network device provided by an embodiment of this application.
  • Terminal device It can be a wireless terminal device that can receive network device scheduling and instruction information.
  • a wireless terminal device can be a device that provides voice and/or data connectivity to users, or a handheld device with wireless connection function, or Other processing equipment connected to the wireless modem.
  • a terminal device can communicate with one or more core networks or the Internet via a radio access network (e.g., radio access network, RAN).
  • the terminal device can be a mobile terminal device, such as a mobile phone (or called a "cellular" phone, mobile phone). (mobile phone)), computers and data cards, for example, may be portable, pocket-sized, handheld, built-in computer or vehicle-mounted mobile devices, which exchange language and/or data with the wireless access network.
  • Wireless terminal equipment can also be called system, subscriber unit, subscriber station, mobile station, mobile station (MS), remote station (remote station), access point ( access point (AP), remote terminal equipment (remote terminal), access terminal equipment (access terminal), user terminal equipment (user terminal), user agent (user agent), subscriber station (SS), user terminal equipment (customer premises equipment, CPE), terminal (terminal), user equipment (user equipment, UE), mobile terminal (mobile terminal, MT), etc.
  • the terminal device may also be a wearable device and a next-generation communication system, for example, a terminal device in a 5G communication system or a terminal device in a public land mobile network (PLMN) that will evolve in the future.
  • PLMN public land mobile network
  • the network equipment may be a radio access network (RAN) node (or device) that connects terminal equipment to the wireless network, and may also be called a base station.
  • RAN equipment are: new generation Node B (gNodeB), transmission reception point (TRP), evolved Node B (evolved Node B, eNB), wireless network in 5G communication system Controller (radio network controller, RNC), node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB), Or home Node B, HNB, baseband unit (BBU), or wireless fidelity (Wi-Fi) access point (AP), etc.
  • gNodeB new generation Node B
  • TRP transmission reception point
  • eNB evolved Node B
  • eNB evolved Node B
  • RNC radio network controller
  • Node B Node B
  • BSC base station controller
  • BTS base transce
  • the network device may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node.
  • the network device may be another device that provides wireless communication functions for the terminal device.
  • the embodiment of the present application does not limit the specific technology and specific device form adopted by the network device.
  • a device that provides a wireless communication function for a terminal device is referred to as a network device.
  • ordinal numbers such as "first" and "second” mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the order, timing, priority, or importance of multiple objects. degree.
  • the first information and the second information are only for distinguishing different information, but do not indicate the difference in priority or importance of the two types of information.
  • FIG. 1 is a schematic diagram of a network architecture to which an embodiment of this application is applicable.
  • the terminal device 130 can access a wireless network to obtain services from an external network (such as the Internet) through the wireless network, or communicate with other devices through the wireless network, for example, it can communicate with other terminal devices.
  • the wireless network includes a radio access network (RAN) device 110 and a core network (core network, CN) device 120.
  • the RAN device 110 is used to connect the terminal device 130 to the wireless network
  • the CN device 120 is used to Manage terminal equipment and provide a gateway for communication with the external network.
  • the number of devices in the communication system shown in FIG. 1 is only for illustration, and the embodiment of the present application is not limited to this. In actual applications, the communication system may also include more terminal devices 130 and more RAN devices. 110, it may also include other devices.
  • the CN may include multiple CN devices 120.
  • the CN device 120 may be an access and mobility management function (AMF) entity, session management A function (session management function, SMF) entity or a user plane function (UPF) entity, etc.
  • AMF access and mobility management function
  • SMF session management function
  • UPF user plane function
  • the CN device 120 may It is a mobility management entity (mobility management entity, MME) and a serving gateway (serving gateway, S-GW), etc.
  • MME mobility management entity
  • serving gateway serving gateway
  • FIG. 2 is a schematic diagram of another network architecture to which the embodiments of this application are applicable.
  • the network architecture includes CN equipment, RAN equipment and terminal equipment.
  • the RAN equipment includes a baseband device and a radio frequency device.
  • the baseband device can be implemented by one node or by multiple nodes.
  • the radio frequency device can be implemented remotely from the baseband device, or integrated in the baseband device, or partially pulled.
  • the remote part is integrated in the baseband device.
  • the RAN equipment (eNB) includes a baseband device and a radio frequency device, where the radio frequency device can be arranged remotely relative to the baseband device, such as a remote radio unit (RRU) arranged remotely relative to the BBU .
  • RRU remote radio unit
  • the control plane protocol layer structure can include the radio resource control (radio resource control, RRC) layer and the packet data convergence protocol (packet data convergence protocol, PDCP) layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC Radio link control
  • MAC media access control
  • user plane protocol layer structure can include PDCP layer, RLC layer, MAC layer
  • SDAP service data adaptation protocol
  • the RAN equipment can be implemented by one node to implement the functions of the RRC, PDCP, RLC, and MAC protocol layers, or multiple nodes can implement the functions of these protocol layers.
  • RAN equipment may include CUs and DUs, and multiple DUs may be centrally controlled by one CU.
  • CU and DU can be divided according to the protocol layer of the wireless network. For example, the functions of the PDCP layer and above protocol layers are set in the CU, and the protocol layers below the PDCP, such as the RLC layer and MAC layer, are set in the DU.
  • This type of protocol layer division is just an example, it can also be divided in other protocol layers, for example, in the RLC layer, the functions of the RLC layer and above protocol layers are set in the CU, and the functions of the protocol layers below the RLC layer are set in the DU; Or, in a certain protocol layer, for example, part of the functions of the RLC layer and the functions of the protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer are set in the DU. In addition, it can also be divided in other ways, for example, by time delay. The functions that need to meet the delay requirement for processing time are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU.
  • the radio frequency device can be remote, not placed in the DU, can also be integrated in the DU, or part of the remote part is integrated in the DU, and there is no restriction here.
  • FIG. 3 is a schematic diagram of another network architecture to which the embodiments of this application are applicable.
  • the control plane (CP) and the user plane (UP) of the CU can also be separated and implemented by dividing them into different entities, namely the control plane (CP) CU entity (That is, the CU-CP entity) and the user plane (UP) CU entity (that is, the CU-UP entity).
  • CP control plane
  • UP user plane
  • the signaling generated by the CU can be sent to the terminal device through the DU, or the signaling generated by the terminal device can be sent to the CU through the DU.
  • the DU may directly pass the protocol layer encapsulation without analyzing the signaling and transparently transmit it to the terminal device or the CU. If the following embodiments involve the transmission of such signaling between the DU and the terminal device, at this time, the sending or receiving of the signaling by the DU includes this scenario.
  • the RRC or PDCP layer signaling will eventually be processed as PHY layer signaling and sent to the terminal device, or converted from the received PHY layer signaling.
  • the RRC or PDCP layer signaling can also be considered to be sent by the DU, or sent by the DU and radio frequency loading.
  • the network architecture shown in Fig. 1, Fig. 2 or Fig. 3 can be applied to various radio access technology (RAT) communication systems, such as LTE communication system or 5G (or called The new radio (NR) communication system may also be a transitional system between an LTE communication system and a 5G communication system.
  • RAT radio access technology
  • the transitional system may also be referred to as a 4.5G communication system, and of course it may also be a future communication system.
  • the network architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application.
  • the devices in the following embodiments of the present application may be located in terminal equipment or network equipment according to their realized functions.
  • the network device may be a CU or DU or a RAN device including CU and DU.
  • the random access process refers to the process from the terminal device sending a random access signal to try to access the network to the process before the basic signaling connection is established with the network device.
  • the random access signal can be used to initiate a random access process.
  • the random access signal can be a random access preamble.
  • the random access signal may also be a demodulation reference signal (demodulation reference signal, DMRS).
  • DMRS demodulation reference signal
  • the terminal equipment can exchange information with the network equipment through the random access process to realize the uplink time synchronization with the communication system.
  • the random access process may also be referred to as random access or random access channel process or random access mode, which is not distinguished in this application, and may be used instead in the following description.
  • the idle state, connected state and inactive state are described below.
  • the network device can store the device parameters of the terminal device. If the terminal device does not communicate with the network device for a long time, the network device will store the device of the terminal device When the parameter is deleted, the state of the terminal device at this time is the idle state. If a terminal device in an idle state needs to communicate with a network device, it needs to initiate a random access procedure again.
  • the device parameter of the terminal device can be stored in the network device. During this period, the terminal device can communicate with the network device. The state of the terminal device at this time is For the connected state. Generally, the terminal device is in the connected state for a short time. After the network device detects that the terminal device has not communicated with the network device for a period of time, it will delete the device parameters of the terminal device stored in the network device, that is, the terminal device changes from the connected state to Idle state.
  • the terminal device in the inactive state disconnects the RRC connection from the network device and does not need to continuously monitor the downlink data, so as to achieve the same power saving effect as the idle state, but both the terminal device and the network device in the inactive state
  • the context information of the terminal device is saved.
  • the network device can configure the inactive terminal device to enter the connected state based on the saved context information, thereby reducing time delay and saving signaling overhead.
  • the random access process can be divided into a contention-based random access process and a non-contention-based random access process. Among them, in the random access process based on contention, the terminal device can select the preamble; in the random access process based on the non-competition, the network device can allocate the preamble to the terminal device.
  • Fig. 4 is a schematic diagram of a random access process provided by an embodiment of the application. As shown in FIG. 4, the random access procedure provided by the embodiment of the present application includes the following steps.
  • Step 400 The network device sends random access configuration information to the terminal device, and the terminal device can receive the random access configuration information from the network device. This step may be used to perform preparatory work before the random access process, and is not a step included in the random access process.
  • the random access configuration information may be used to configure random access parameters, and the random access parameters may include a set of random access preambles.
  • Step 401 The terminal device sends a random access request to the network device.
  • the random access request may include a random access preamble, and the network device receives the random access preamble from the terminal device.
  • the random access request is also called the first message or message 1 (MSG1) in the random access process.
  • the random access preamble sent by the terminal device to the network device may be a random access preamble selected by the terminal device from the random access preamble set for random access acquired in step 400.
  • Step 402 After detecting the random access preamble sent by the terminal device, the network device sends a random access response (RAR) to the terminal device, and the terminal device receives the random access response from the network device.
  • RAR random access response
  • the access response is also called the second message or message 2 (MSG2) in the random access process.
  • the second message may include a timing advance command (TAC), an uplink grant (uplink grant), a temporary cell-radio network temporary identifier (TC-RNTI), and the like.
  • TAC timing advance command
  • uplink grant uplink grant
  • TC-RNTI temporary cell-radio network temporary identifier
  • the uplink authorization refers to the indication information of the uplink resources allocated by the network equipment to the terminal device or the uplink authorization is used to indicate the uplink resources allocated by the network equipment to the terminal device
  • the TC-RNTI is a temporary identifier allocated by the network equipment to the terminal device.
  • Step 403 The terminal device sends uplink signaling to the network device, and the network device receives the uplink signaling from the terminal device.
  • the uplink signaling is also called the third message or message 3 (MSG3) in the random access process.
  • the terminal device may send the third message on the uplink resource indicated by the uplink grant according to the timing advance (TA) indicated by the TAC.
  • TA timing advance
  • the third message sent by it may include common control channel (CCCH) information.
  • CCCH common control channel
  • Step 404 The network device detects the third message and sends a contention resolution message (CRM) to the terminal device. Accordingly, the terminal device can receive the contention resolution message from the network device, where the contention resolution message is also called The fourth message or message 4 (MSG4).
  • CCM contention resolution message
  • MSG4 The fourth message or message 4
  • the TC-RNTI may be used to scramble the downlink control information used for scheduling the contention resolution message.
  • the terminal device listens to the TC-RNTI scrambled downlink control information before the contention resolution timer expires, it can associate the contention resolution identifier (CRID) with the common content carried in the third message of the terminal device.
  • the control channel information is matched, and if the matching is successful, the terminal device considers that the contention resolution is successful, that is, the random access is successful; otherwise, the terminal device considers the random access failed.
  • FIG. 5 is a schematic diagram of another random access process provided by an embodiment of this application. As shown in FIG. 5, the random access procedure provided by the embodiment of the present application includes the following steps.
  • step 500 the network device sends random access configuration information to the terminal device, and the terminal device can receive the random access configuration information from the network device.
  • This step may be used to perform preparatory work before the random access process, and is not a step included in the random access process.
  • the random access configuration information can be used to allocate a dedicated random access preamble to the terminal device.
  • Step 501 The terminal device sends a random access request to the network device.
  • the random access request may include a random access preamble, and the network device receives the random access preamble from the terminal device.
  • the random access request is also called the first message or message 1 in the random access process.
  • the random access preamble sent by the terminal device to the network device may be a dedicated random access preamble allocated by the network device to the terminal device.
  • Step 502 After detecting the random access preamble sent by the terminal device, the network device sends a random access response to the terminal device, and the terminal device receives the random access response from the network device and determines that this random access is successful. Among them, the random access response is also called the second message or message 2 in the random access process.
  • the non-contention-based random access procedure may not include the third message and the fourth message.
  • the terminal equipment in the idle state can complete the initial access through the random access process described in Figure 4 or Figure 5, and the terminal equipment in the inactive state can be connected to the random access process described in Figure 4 or Figure 5 through the random access process described in Figure 4 or Figure 5.
  • the network device establishes uplink synchronization.
  • a terminal device in an idle state or an inactive state may also request system information through a random access procedure, which can be referred to the following description.
  • uplink data transmission is that different terminal devices have orthogonal multiple access in time and frequency, that is, the uplink data transmissions of different terminal devices from the same cell do not interfere with each other.
  • the network equipment requires signals from different terminal equipment in the same subframe but with different frequency domain resources to arrive at the network equipment at substantially the same time. If the network device receives the uplink data sent by the terminal device within the cyclic prefix (CP) range, it can decode the uplink data correctly. Therefore, the uplink synchronization requires the time for the signals from different terminal devices in the same subframe to reach the network. All fall within the CP.
  • CP cyclic prefix
  • the terminal device can adjust the uplink transmission time according to the timing advance (TA) amount, so that the time when the uplink data sent by each terminal device arrives at the network device is aligned.
  • TA timing advance
  • Figure 6 is an example diagram of uplink synchronization. As shown in Figure 6, in order for the network device to receive uplink data at time T0, terminal device 1 needs to perform uplink transmission according to TA1 at time T1, and terminal device 2 needs to perform uplink transmission according to TA2. Uplink transmission is performed at T2.
  • the network device may send a timing advance command to the terminal device.
  • the network device may estimate the timing advance of the terminal device according to the random access preamble sent by the terminal device, and then send the timing advance command to the terminal device; accordingly, The terminal device can obtain the timing advance according to the timing advance command.
  • the network device After the network device sends a timing advance command to the terminal device, it will start a timing advance timer (time advance timer, TA timer), and the terminal device will also turn on the same TA timer after getting the timing advance, and both the network device and the terminal device maintain TA timer can determine whether the timing advance is valid according to whether the TA timer has timed out.
  • TA timer timing advance timer
  • the timing advance is considered valid, otherwise, the timing advance is considered invalid.
  • the uplink data transmission can be performed on the pre-configured uplink resources according to the predetermined transmission mode.
  • the timing advance is effective or “timing advance effective” involved in the embodiments of this application can be understood as the timing advance is accurate, that is, it can be guaranteed that the terminal device uses the timing advance to send
  • the uplink data can arrive at the network device at the same time as the uplink data sent by other terminal devices, thereby avoiding interference between terminal devices.
  • timing advance is invalid or “timing advance is invalid” involved in the embodiments of this application can be understood as the timing advance is inaccurate, and the terminal equipment uses the timing advance to send uplink data to other terminal equipment.
  • the time when the uplink data arrives at the network device is different, which may cause interference between terminal devices.
  • the network device can send system information to the terminal device to notify the terminal device of various information about the system.
  • the network device can use a broadcast method to The system information is sent to the terminal device.
  • the 5G communication system proposes to divide system information into two types, namely necessary system information and non-essential system information. Necessary system information can be broadcast periodically, and non-essential system information can be provided to terminal devices based on the needs of specific terminal devices to save resources. Non-essential system information can also be called on-demand system information.
  • System information may include master information block (MIB), system information block 1 (system information block 1, SIB1), and other system information blocks (such as system information block used for positioning) except for system information block 1.
  • System information block one may include scheduling information of other system information blocks, and the system information block used for positioning may also be referred to as a positioning system information block (posSIB).
  • the main information block and the system information block are necessary system information, and the necessary system information can also be called minimum system information (minimum SI); other system information blocks except SIB1 are non-essential system information, and non-essential system information is also It can be called other system information (other SI).
  • System messages may also be called system information messages (SI messages), which are used to carry system information blocks.
  • SI messages system information messages
  • a system message may include one or more system information blocks, and the mapping relationship between system information blocks and system messages (that is, which system information blocks are included in a system message) may be included in system information block one.
  • the network device can send non-essential system information in an on-demand manner, which can be understood as sending non-essential system information according to the request of the terminal device.
  • the terminal device can initiate an acquisition request for system information a to the network device, and the network device can send the system information according to the acquisition request.
  • Information a the broadcast status of the system information can be pre-configured by the network device to the terminal device. If the broadcast status of the system information is "not broadcast", it means that the network device will not broadcast the system information periodically.
  • non-essential system information is usually the system information requested by terminal devices in the idle state or inactive state, therefore, in the 5G communication system, only the terminal devices in the idle state or inactive state are supported to request non-essential system information.
  • the network device may request system information from the network device during the random access process, and the network device may send the system information requested by the terminal device in a broadcast manner.
  • the terminal device may send a message to the user through the first message in the random access process (it may be the first message in the contention-based random access process, or it may also be the first message in the non-contention-based random access process).
  • the network device requests the system information, or may request the system information from the network device through the third message in the random access process (may be the third message in the contention-based random access process).
  • the method in which the terminal device requests system information from the network device through the first message in the random access process can also be referred to as the Msg1 (Msg1 based) method.
  • the terminal device sends the network device to the network device through the third message in the random access process.
  • the method of requesting system information may also be referred to as an Msg3 (Msg3 based) method.
  • the requested system information cannot be received (for example, if the network device is a terminal device a activated bandwidth part (BWP) and the public search space of the system information is not configured, the terminal device will not be able to obtain the network device through broadcast System information sent).
  • BWP activated bandwidth part
  • the terminal device b when the terminal device b is in the connected state, when the terminal device b requests system information through the first message in the random access process, the terminal device b may not be able to update the timing advance in time, thereby affecting the uplink data transmission.
  • an embodiment of the present application provides a communication method for enabling terminal devices in a connected state to obtain non-essential system information.
  • the communication method provided in the embodiment of the present application may include two possible solutions, which are referred to as solution one and solution two for ease of description.
  • the terminal device in the connected state
  • the request message includes the identification of the terminal device, so that the network device can send unicast based on the identification of the terminal device
  • the system information requested by the terminal device avoids the problem that the terminal device may not be able to receive the system information when the system information is sent by broadcast.
  • the terminal device (in the connected state) sends a request message to the network device, and the request information is carried on the random access resource corresponding to the requested system information, and receives the response message sent by the network device.
  • the response message includes the timing advance Command, so that the terminal equipment can update the timing advance in time to ensure normal uplink data transmission.
  • FIG. 7 is a schematic diagram of a process corresponding to the communication method provided in Embodiment 1 of the application, as shown in FIG. 7, including:
  • Step 701 The terminal device obtains the identification of the terminal device.
  • the identifier of the terminal device may be a cell radio network temporary identifier (C-RNTI) of the terminal device.
  • C-RNTI cell radio network temporary identifier
  • the terminal device may pass a random access process (for ease of description, it is referred to herein as the first random access process; the first random access process may be a contention-based random access process or a non-competition-based random access process. Entry process) Obtain the identification of the terminal device.
  • the terminal device can send a random access request for the first random access process to the network device, and then receive a random access response from the network device, and then randomly access
  • the incoming response includes TC-RNTI (referred to as the first TC-RNTI for ease of description) and uplink authorization; the terminal device can send uplink signaling to the network device on the resource indicated by the uplink authorization, and then according to the first TC-RNTI Receive the contention resolution message sent by the network device; when the contention resolution is successful, the first TC-RNTI of the terminal device is transformed into the C-RNTI of the terminal device, that is, the terminal device has acquired the C-RNTI.
  • TC-RNTI referred to as the first TC-RNTI for ease of description
  • the successful contention resolution means that the random access is successful, it also means that the terminal device has established a connection with the network device, and it also means that the terminal device enters the connected state from the idle state or the inactive state. Therefore, when the terminal device obtains the identification of the terminal device, it can also be understood that the terminal device establishes a connection with the network device, or the terminal device enters or is in a connected state.
  • Step 702 The terminal device sends a request message to the network device.
  • the request message includes the C-RNTI of the terminal device and first information.
  • the first information may be used to indicate the system information requested by the terminal device.
  • the network device receives the request message from the terminal device.
  • the C-RNTI of the terminal device can be carried in a medium access control control element (MAC CE), or can also be carried in RRC signaling, which is not specifically limited.
  • the first information may be carried in the MAC CE, or may also be carried in the RRC signaling, which is not specifically limited.
  • the C-RNTI and the first information of the terminal device can be carried in the same MAC CE, or can also be carried in different MAC CEs in.
  • the C-RNTI and the first information of the terminal device can be carried in the same RRC signaling, or can also be carried in the same RRC signaling.
  • Different RRC signaling the C-RNTI of the terminal device may be carried in the MAC CE, and the first information may be carried in RRC signaling; or, the C-RNTI of the terminal device may be carried in the RRC signaling, and the first information It is carried in the MAC CE; in this case, the request message may include MAC CE and RRC signaling.
  • the first information may indicate the system information requested by the terminal device. Three possible ways are described below.
  • the first information may include a bitmap.
  • the bitmap includes multiple bits. Each bit may correspond to a system information block. The value of each bit is used to indicate whether the corresponding system information block is requested; As an example, if the value of bit 1 is 1, it means that the system information block corresponding to bit 1 is requested, and if the value of bit 1 is 0, it means that the system information block corresponding to bit 1 is not requested.
  • the number of bits included in the first information may be related to the number of system information blocks configured in system information block 1. For example, the number of bits included in the first information is equal to that in system information block 1. The number of configured system information blocks.
  • the first information carried in the MAC CE may include K bits (represented as T 0 to T K ), and then Know the number of bytes included in MAC CE among them, Represents rounding up; the length of one byte is equal to the length of one octet, which is 8 bits.
  • Figure 8a which is an example of a format of MAC CE.
  • the last 3 bits (that is, the last 3 bits from right to left) in Oct N can be reserved bits ( reserved).
  • the first information may include a bitmap, the bitmap includes multiple bits, each bit may correspond to a system message, and the value of each bit is used to indicate whether the corresponding system message is requested; for example, bit 1 is For example, if the value of bit 1 is 1, it means that the system message corresponding to bit 1 is requested, and if the value of bit 1 is 0, it means that the system message corresponding to bit 1 is not requested.
  • the number of bits included in the first information may be related to the number of system messages configured in system information block 1. For example, the number of bits included in the first information is equal to the number of bits configured in system information block 1. The number of system messages.
  • the first information carried in the MAC CE may include P bits (represented as T 0 to T P ), and then it can be seen Number of bytes included in MAC CE Refer to Figure 8b, which is an example of a format of MAC CE.
  • the last 3 bits (that is, the last 3 bits from right to left) in Oct L can be reserved bits ( reserved).
  • the first information may include a bitmap and indication information.
  • the bitmap includes multiple bits.
  • the indication information is used to indicate the granularity of the system information corresponding to each bit.
  • the granularity of the system information may be a system information block or a system message. If the indication information indicates that the granularity of the system information corresponding to each bit is a system information block, then each bit can correspond to one system information block; if the indication information indicates that the granularity of the system information corresponding to each bit is a system message, then each bit Can correspond to a system message.
  • the indication information may include 1 bit.
  • the granularity of the system information corresponding to each bit is a system information block; when the value of this bit is 0, it means The granularity of the system information corresponding to each bit is the system message. It should be noted that the granularity of the system information may also be other possible units. Here, the granularity of the system information is a system information block or a system message as an example for description.
  • field I is used to carry indication information
  • field I may include 1 bit
  • R represents a reserved bit.
  • the first information may also indicate the requested system information in other possible manners, which is not limited in the embodiment of the present application.
  • the terminal device can send a request message to the network device through a random access process (for ease of description, here is called the second random access process; the second random access process can be a contention-based random access process).
  • the specific implementation may include the following steps:
  • Step 1 The terminal device can send a random access request for the second random access process to the network device.
  • the random access request includes a random access preamble.
  • the access request at any time can be used to initiate random access; and the network device can receive it. Random access preamble from terminal equipment.
  • Step 2 After receiving the random access request, the network device can send an access response at any time, and the random access response can include uplink authorization; then the terminal device can receive the access response at any time from the network device.
  • the random access response may also include TC-RNTI (referred to as the second TC-RNTI for ease of description), and the second TC-RNTI may be different from the first TC-RNTI, or in other words, the second TC-RNTI.
  • the RNTI may be different from the C-RNTI of the terminal equipment.
  • the random access response may also include a timing advance command.
  • the terminal device can update the timing advance of the terminal device according to the timing advance command, and start or restart the timer. Before the timer expires, the updated timing advance is valid. Similarly, after the network device sends a random response, it can also start or restart the timer.
  • the terminal device may update the timing advance of the terminal device according to the timing advance command in various implementation manners.
  • a timing advance can be maintained in the terminal device, and after receiving the timing advance command, the timing advance can be updated according to the timing advance command.
  • the terminal device supports multiple uplink carriers (for example, in a carrier aggregation scenario)
  • multiple timing advances may be maintained in the terminal device.
  • the so-called carrier aggregation is the aggregation of multiple component carriers (CC) together to serve one terminal device, and the carrier aggregation may also be referred to as the aggregation of cells.
  • the aggregated multiple cells include one primary cell (primary component cell, PCell)), and may also include one primary and secondary cell (primary secondary cell, PSCell) and one or more secondary cells (secondary component cell, SCell).
  • the multiple uplink carriers may not co-site on the network side, or the beam directions on different carriers may be different, etc., which may cause the terminal device to be on different uplink carriers.
  • the transmission timing advances are different, so different carriers can be divided into different timing advance groups (timing advance group, TAG), and all carriers in a TAG can use the same timing advance. If a TAG contains PCell or PSCell, this TAG is referred to as the primary timing advance group (pTAG) in the embodiment of this application.
  • TAG timing advance group
  • pTAG primary timing advance group
  • the embodiment of this application is referred to as the secondary timing advance group sTAG. It can be seen from this that in the carrier aggregation scenario, the terminal device can maintain two timing advances, which are the timing advance corresponding to pTAG and the timing advance corresponding to sTAG.
  • the terminal device After the terminal device receives the timing advance command, if it is determined that the timing advance corresponding to pTAG is invalid, it can update the timing advance corresponding to pTAG according to the timing advance command; or, if it is determined that the timing advance corresponding to pTAG is valid, And the timing advance corresponding to the sTAG is invalid, the timing advance corresponding to the sTAG can be updated according to the timing advance command.
  • the network device may first send downlink control information (DCI) for scheduling the random access response, and the DCI may use the random access wireless network temporary identifier ( random access-radio network temporary identifier, RA-RNTI) scrambling, the DCI is used to indicate the resource carrying the random access response; and then the random access response is sent on the resource indicated by the DCI.
  • DCI downlink control information
  • the terminal device can receive a random access response on the resource indicated by the DCI.
  • Step 3 The terminal device can use the uplink authorization to send a request message to the network device, or in other words, send a request message to the network device on the resource indicated by the uplink authorization, and then the network device can receive the request message from the terminal device.
  • step 4 the network device sends a contention resolution message to the terminal device, and then the terminal device receives the contention resolution message from the network device.
  • the terminal device determines that the contention resolution is successful, it can determine that the system information request is successful and can receive system information; if it is determined that the contention resolution has failed, it can request system information again.
  • the second TC-RNTI can be ignored, and "ignore" here can also be understood as "discard”.
  • a possible implementation manner for the network device to send the contention resolution message to the terminal device is that the network device sends the second DCI for scheduling the contention resolution message, and the second DCI can be through the C-RNTI or the second TC- of the terminal device. RNTI scrambling, the second DCI can be used to indicate the resource carrying the contention resolution message; and, the contention resolution message is sent on the resource indicated by the second DCI.
  • the terminal device may receive the contention resolution message on the resource indicated by the second DCI according to the second DCI.
  • whether the second DCI is scrambled by the C-RNTI of the terminal device or the second TC-RNTI may be agreed upon by a protocol, or may also be instructed by the network device to the terminal device, which is not specifically limited.
  • the terminal device may, after receiving the second DCI scrambled by the C-RNTI or the second TC-RNTI, be able to descramble the C-RNTI or the second TC-RNTI according to whether the C-RNTI or the second TC-RNTI can be descrambled.
  • the second DCI scrambled by RNTI is used to determine whether the contention conflict resolution is successful; if the identity of the terminal device is carried in the RRC signaling, the terminal device can be based on the received C-RNTI or the second TC-RNTI scrambled by the second DCI. Whether the carried contention conflict resolution MAC CE is consistent with the first 48 bits of the request message determines whether the contention resolution is successful.
  • step 1 and step 2 described above can be the same as that of step 401 and step 402 described in FIG. 4, and step 401 and step 402 can be referred to.
  • the difference between the request message involved in step 3 and the third message in step 403 is that the request message includes the C-RNTI of the terminal device.
  • the second DCI may be scrambled by the C-RNTI or TC-RNTI (for example, the second TC-RNTI) of the terminal device, and the DCI of the contention resolution message used for scheduling in step 404 is through the TC-RNTI
  • step 404 For other content other than this difference, please refer to step 404.
  • Step 704 The network device sends the requested system information to the terminal device according to the identification of the terminal device.
  • the terminal device receives system information from the network device.
  • the network device may send the requested system information to the terminal device in various ways according to the identification of the terminal device.
  • the network device may send the first DCI used for scheduling system information, the first DCI is scrambled by the C-RNTI of the terminal device, and the first DCI is used to indicate the resource carrying the system information; and, Send system information on the resource indicated by the first DCI.
  • the terminal device can receive system information on the resource indicated by the first DCI.
  • the terminal device can receive the first DCI through the blind detection process based on the C-RNTI, and other terminal devices except the terminal device are not Without knowing the C-RNTI of the terminal device, the first DCI cannot be received, and therefore the system information cannot be received on the resource indicated by the first DCI. Therefore, the network device uses the C-RNTI of the terminal device in the above manner. Realize the unicast of system information to the terminal device.
  • the network device may send the first downlink control information (downlink control information, DCI) to the terminal device through the downlink control channel.
  • the downlink control channel may be a physical downlink control channel (PDCCH), or an enhanced physical downlink control channel (ePDCCH), or other possible downlink control channels, which are not specifically limited.
  • the first DCI is scrambled by C-RNTI, which can also be described as the first DCI scrambled by C-RNTI, or the cyclic redundancy check (CRC) check in the first DCI
  • C-RNTI cyclic redundancy check
  • the information is scrambled using C-RNTI.
  • the DCI encoding process includes: Step 1.
  • DCI format DCI format
  • an information sequence such as a 0 , a 1 , a 2 , a 3 ,...,
  • Step 4 Perform channel coding and rate matching, complete the coding process, and obtain the coded DCI. It is understandable that the foregoing second DCI scrambled by the C-RNTI or the second TC-RNTI of the terminal device can also refer to the description here.
  • the network device can send the system information requested by the terminal device through unicast according to the identification of the terminal device, avoiding broadcasting The problem that the terminal device may not be able to receive the system information due to the way that the system information is sent.
  • the terminal device when it requests system information through the third message of the random access process, after the contention is resolved successfully, the terminal device usually no longer maintains the timing advance, such as stopping the timing Device.
  • the uplink data transmission is usually performed after accessing the network device through the random access process, or in the third message of the random access process.
  • a small amount of uplink data transmission that is, uplink data transmission is performed during the process of accessing network equipment, and when the terminal device does not need to perform uplink data transmission, it is not necessary to obtain or maintain the timing advance.
  • the terminal device passes through at any time When the access process requests system information, even if the prompt advance is obtained, there is no need to maintain it.
  • the terminal device can continue to maintain the timing advance, that is, the timing advance is always valid before the timer expires, which can effectively avoid the timing advance.
  • the amount of data is invalid and affects the uplink data transmission.
  • FIG. 9 is a schematic flowchart corresponding to the communication method provided in the second embodiment of the application, as shown in FIG. 9, including:
  • Step 901 The terminal device establishes a connection with the network device.
  • Step 902 The terminal device sends a request message to the network device, the request message is used to request system information, and the request message is carried on the random access resource corresponding to the system information.
  • the random access resource may be a physical random access channel (PRACH) resource; the request message may be a random access request, and the request message may include a random access preamble.
  • the request message may be a random access request in a contention-based random access process, or may also be a random access request in a non-contention-based random access process.
  • Step 903 The network device receives the request message.
  • the network device can configure a PRACH resource dedicated to requesting system information in the system message block 1.
  • the terminal device can request system information from the network device through the PRACH resource configured by the network device.
  • the network device is configured with a PRACH resource dedicated to requesting system information, which can be understood as the network device is configured with a mapping relationship (or corresponding relationship) between the PRACH resource and the system information.
  • the terminal device can use the PRACH resource corresponding to the requested system information (such as system information 1) to send a request message to the network device according to the mapping relationship between the PRACH resource and the system information, and then the network device can send a request message to the network device after receiving the request message on the PRACH resource.
  • the system information 1 is sent according to the mapping relationship between the PRACH resource and the system information.
  • Table 1 is an example of the mapping relationship between PRACH resources and system information.
  • Table 1 Example of the mapping relationship between PRACH resources and system information
  • PRACH resources system message PRACH resource 1 System Information 1 PRACH resources 2 System Information 2 and System Information 3
  • PRACH resource 1 corresponds to system information 1
  • PRACH resource 2 corresponds to system information 2 and system information 3. If the terminal device uses PRACH resource 1 when sending the first message, it indicates that the terminal device requests system information 1, and if the terminal device uses PRACH resource 2 when sending the first message, it indicates that the terminal device requests It is system information 2 and system information 3.
  • the system information in Table 1 can be understood as a system information block or system message, which is not specifically limited.
  • Step 904 The network device sends a response message according to the request message, and the response message may include a timing advance command.
  • Step 905 The terminal device receives a response message from the network device.
  • the response message here can be understood as a random access response.
  • step 906 the terminal device updates the timing advance of the terminal device according to the timing advance command, and starts or restarts the timer. Before the timer expires, the updated timing advance is valid.
  • Step 907 The network device sends system information.
  • the network device can send system information by broadcasting.
  • Step 908 The terminal device receives the system information from the network device.
  • the terminal device since the terminal device receives the response message after sending the request message, it can be considered that the system information request is successful and starts to receive the system information. If the terminal device does not receive the response message in the corresponding random access response window after sending the request message, it can be considered that the system information request has failed. In this case, the terminal device can re-initiate the random access process to request system information.
  • the network device after the network device receives the first message sent by the terminal device for requesting system information, it can send a response message according to the first message. Including the timing advance command, the terminal device may be a terminal device in a connected state or a terminal device in an inactive state or an idle state.
  • the network device after the network device receives the first message sent by the terminal device for requesting system information, it can determine whether the terminal device is a connected terminal device. If it is a connected terminal device, it can determine whether it is a connected terminal device. 1 message to send a response message, the response message includes a timing advance command; if it is an idle or inactive terminal device, a response message can be sent according to the first message, and the response message may not include a timing advance command.
  • the terminal device in the connected state can request system information through the first message of the random access process, so that the terminal device in the connected state can obtain unnecessary system information.
  • the random access response sent by the network device usually only contains the random access preamble identifier. It does not include other information, such as timing advance commands. This is because for idle or inactive terminal devices, the uplink data transmission is usually performed after accessing the network device through the random access process, or in the third message of the random access process. A small amount of uplink data transmission, and when the terminal device does not need to perform uplink data transmission, it is not necessary to obtain or maintain the timing advance.
  • the network device does not need to estimate the timing advance of the terminal device, and the random access response sent by the network device does not include the timing advance command.
  • the response message sent according to the first message may include a timing advance command, so that the terminal device can update the timing advance in time to ensure uplink data Transmission is normal.
  • step numbers involved in FIG. 7 or FIG. 9 are only a possible example of the execution process, and do not constitute a restriction on the order of execution of each step.
  • the foregoing step 907 may be performed before step 906, or step 907 may be performed simultaneously with step 906, which is not specifically limited.
  • the first embodiment above describes the realization of the connected terminal device requesting system information through the third message of the random access process
  • the second embodiment describes the first message of the connected terminal device through the random access process. Request the realization of system information.
  • the first embodiment and the second embodiment may refer to each other.
  • the network device or the terminal device may include a corresponding hardware structure and/or software module for performing each function.
  • the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiment of the present application may divide the terminal device and the network device into functional units according to the foregoing method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • FIG. 10 shows a possible exemplary block diagram of a device involved in an embodiment of the present application.
  • the apparatus 1000 may include: a processing unit 1002 and a communication unit 1003.
  • the processing unit 1002 is used to control and manage the actions of the device 1000.
  • the communication unit 1003 is used to support communication between the apparatus 1000 and other devices.
  • the communication unit 1003 is also called a transceiving unit, and may include a receiving unit and/or a sending unit, which are used to perform receiving and sending operations, respectively.
  • the device 1000 may further include a storage unit 1001 for storing program codes and/or data of the device 1000.
  • the apparatus 1000 may be the terminal device in any of the foregoing embodiments, or may also be a chip provided in the terminal device.
  • the processing unit 1002 may support the apparatus 1000 to perform the actions of the terminal device in the foregoing method examples.
  • the processing unit 1002 mainly executes the internal actions of the terminal device in the method example, and the communication unit 1003 can support communication between the apparatus 1000 and the network device.
  • the processing unit 1002 is used to perform step 906 in FIG. 9; the communication unit 1003 can be used to perform step 701, step 702, and step 705 in FIG. 7, and step 901, step 902, step 905, and step 908 in FIG. 9 .
  • the communication unit 1003 is configured to: obtain the identity of the terminal device, and then send a request message to the network device, the request message includes the identity of the terminal device and first information, and the first information is used to indicate the identity of the terminal device and the first information.
  • the system information requested by the terminal device and then receive the system information from the network device.
  • the communication unit 1003 is specifically configured to: receive first downlink control information used for scheduling system information from a network device, and the first downlink control information is scrambled by the identification of the terminal device; According to the first downlink control information, system information from the network device is received.
  • the first information includes multiple bits, each bit corresponds to a system information block or corresponds to a system message, and the value of the bit is used to indicate whether the corresponding system information block or system message is request.
  • the first information further includes indication information, and the indication information is used to indicate the granularity of the system information corresponding to the bit.
  • the first information is carried in the MAC CE.
  • the communication unit 1003 is specifically configured to: send a random access request to the network device; receive a random access response of the random access request, where the random access response includes an uplink authorization; use the uplink authorization to send to the network device Request message.
  • the communication unit 1003 is further configured to: receive second downlink control information for scheduling contention resolution messages from the network device, and the second downlink control information is through the identification of the terminal device or the TC-RNTI of the terminal device. Scrambling; receiving a contention resolution message according to the second downlink control information.
  • the random access response further includes a timing advance command; the processing unit 1002 is configured to: update the timing advance of the terminal device according to the timing advance command, and start or restart a timer.
  • the identifier of the terminal device is the C-RNTI of the terminal device.
  • the communication unit 1003 is configured to: establish a connection with a network device, and send a request message to the network device, the request message is used to request system information, and the request message is carried on the random access resource corresponding to the system information And then receive a response message sent by the network device according to the request message, the response message includes a timing advance command; the processing unit 1002 is configured to: according to the timing advance command, update the timing advance of the terminal device, start or restart the timer; communication unit 1003 Also used to: receive system information sent by network devices.
  • the apparatus 1000 may also be the network device in any of the foregoing embodiments, or may also be a chip set in the network device.
  • the processing unit 1002 may support the apparatus 1000 to perform the actions of the network device in the above method examples.
  • the processing unit 1002 mainly executes the internal actions of the network device in the method example, and the communication unit 1003 can support communication between the apparatus 1000 and the terminal device.
  • the communication unit 1003 may be used to perform step 703 and step 704 in FIG. 7 and step 901, step 903, step 904, and step 907 in FIG. 9.
  • the communication unit 1003 is configured to: receive a request message from a terminal device, the terminal device is in a connected state, and the request message includes the identification of the terminal device and the first information. A piece of information is used to indicate the system information requested by the terminal device; and then the system information is sent according to the identifier of the terminal device.
  • the communication unit 1003 is specifically configured to: send first downlink control information used for scheduling the system information, and the first downlink control information is scrambled by the identifier of the terminal device; and send; The system information.
  • the first information includes multiple bits, each bit corresponds to a system information block or corresponds to a system message, and the value of the bit is used to indicate whether the corresponding system information block or system message is request.
  • the first information further includes indication information, and the indication information is used to indicate the granularity of the system information corresponding to the bit.
  • the first information is carried in the MAC CE.
  • the communication unit 1003 is specifically configured to: receive a random access request from the terminal device; send a random access response of the random access request, where the random access response includes an uplink authorization; Receiving the request message sent by the terminal device using the uplink authorization.
  • the communication unit 1003 is further configured to send second downlink control information for scheduling contention resolution messages, where the second downlink control information passes through the identification of the terminal device or the TC of the terminal device. -RNTI scrambling; sending the contention resolution message.
  • the random access response further includes a timing advance command; the processing unit 1002 is configured to: start or restart a timer.
  • the identifier of the terminal device is the C-RNTI of the terminal device.
  • the communication unit 1003 is used to establish a connection with a terminal device and receive a request message sent by the terminal device.
  • the request message is used to request system information, and the request message is carried in the random access resource corresponding to the system information. Up; Send a response message to the terminal device, the response message includes a timing advance command; and, send system information.
  • each unit in the device can be all implemented in the form of software called by processing elements; they can also be all implemented in the form of hardware; part of the units can also be implemented in the form of software called by the processing elements, and some of the units can be implemented in the form of hardware.
  • each unit can be a separate processing element, or it can be integrated in a certain chip of the device for implementation.
  • it can also be stored in the memory in the form of a program, which is called and executed by a certain processing element of the device.
  • each step of the above method or each of the above units may be implemented by an integrated logic circuit of hardware in a processor element or implemented in a form of being called by software through a processing element.
  • the unit in any of the above devices may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (ASICs), or, one or Multiple microprocessors (digital singnal processors, DSPs), or, one or more field programmable gate arrays (Field Programmable Gate Arrays, FPGAs), or a combination of at least two of these integrated circuits.
  • ASICs application specific integrated circuits
  • DSPs digital singnal processors
  • FPGAs Field Programmable Gate Arrays
  • the unit in the device can be implemented in the form of a processing element scheduler
  • the processing element can be a processor, such as a general-purpose central processing unit (central processing unit, CPU), or other processors that can call programs.
  • CPU central processing unit
  • these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).
  • the above receiving unit is an interface circuit of the device for receiving signals from other devices.
  • the receiving unit is an interface circuit used by the chip to receive signals from other chips or devices.
  • the above unit for sending is an interface circuit of the device for sending signals to other devices.
  • the sending unit is an interface circuit used by the chip to send signals to other chips or devices.
  • FIG. 11 is a schematic structural diagram of a terminal device according to an embodiment of the application. It may be the terminal device in the above embodiment, and is used to implement the operation of the terminal device in the above embodiment.
  • the terminal device includes: an antenna 1110, a radio frequency part 1120, and a signal processing part 1130.
  • the antenna 1110 is connected to the radio frequency part 1120.
  • the radio frequency part 1120 receives the information sent by the network device through the antenna 1110, and sends the information sent by the network device to the signal processing part 1130 for processing.
  • the signal processing part 1130 processes the information of the terminal equipment and sends it to the radio frequency part 1120
  • the radio frequency part 1120 processes the information of the terminal equipment and sends it to the network equipment via the antenna 1110.
  • the signal processing part 1130 may include a modem subsystem, which is used to process the various communication protocol layers of the data; it may also include a central processing subsystem, which is used to process the terminal device operating system and application layer; in addition, it may also Including other subsystems, such as multimedia subsystems, peripheral subsystems, etc., where the multimedia subsystem is used to control the terminal device camera, screen display, etc., and the peripheral subsystem is used to realize the connection with other devices.
  • the modem subsystem can be a separate chip.
  • the modem subsystem may include one or more processing elements 1131, for example, including a main control CPU and other integrated circuits.
  • the modem subsystem may also include a storage element 1132 and an interface circuit 1133.
  • the storage element 1132 is used to store data and programs, but the program used to execute the method executed by the terminal device in the above method may not be stored in the storage element 1132, but is stored in a memory outside the modem subsystem, When in use, the modem subsystem is loaded and used.
  • the interface circuit 1133 is used to communicate with other subsystems.
  • the modem subsystem can be implemented by a chip, which includes at least one processing element and an interface circuit, where the processing element is used to execute each step of any method executed by the above terminal device, and the interface circuit is used to communicate with other devices.
  • the unit for the terminal device to implement each step in the above method can be implemented in the form of a processing element scheduler.
  • the device for the terminal device includes a processing element and a storage element, and the processing element calls the program stored by the storage element to Perform the method performed by the terminal device in the above method embodiment.
  • the storage element may be a storage element whose processing element is on the same chip, that is, an on-chip storage element.
  • the program used to execute the method executed by the terminal device in the above method may be a storage element on a different chip from the processing element, that is, an off-chip storage element.
  • the processing element calls or loads a program from the off-chip storage element on the on-chip storage element to call and execute the method executed by the terminal device in the above method embodiment.
  • the unit of the terminal device that implements each step in the above method may be configured as one or more processing elements, and these processing elements are arranged on the modem subsystem, where the processing elements may be integrated circuits, For example: one or more ASICs, or, one or more DSPs, or, one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits can be integrated together to form a chip.
  • the units of the terminal device that implement each step in the above method can be integrated together and implemented in the form of an SOC, and the SOC chip is used to implement the above method.
  • the chip can integrate at least one processing element and a storage element, and the processing element can call the stored program of the storage element to implement the method executed by the above terminal device; or, the chip can integrate at least one integrated circuit to implement the above terminal The method executed by the device; or, it can be combined with the above implementations.
  • the functions of some units are implemented in the form of calling programs by processing elements, and the functions of some units are implemented in the form of integrated circuits.
  • the above apparatus for terminal equipment may include at least one processing element and an interface circuit, wherein at least one processing element is used to execute any of the methods performed by the terminal equipment provided in the above method embodiments.
  • the processing element can execute part or all of the steps executed by the terminal device in the first way: calling the program stored in the storage element; or in the second way: combining instructions through the integrated logic circuit of the hardware in the processor element Part or all of the steps executed by the terminal device are executed in a manner; of course, part or all of the steps executed by the terminal device may also be executed in combination with the first manner and the second manner.
  • the processing element here is the same as that described above, and can be implemented by a processor, and the function of the processing element can be the same as the function of the processing unit described in FIG. 10.
  • the processing element may be a general-purpose processor, such as a CPU, or one or more integrated circuits configured to implement the above method, such as: one or more ASICs, or, one or more microprocessors DSP , Or, one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms.
  • the storage element may be realized by a memory, and the function of the storage element may be the same as the function of the storage unit described in FIG. 12.
  • the storage element may be realized by a memory, and the function of the storage element may be the same as the function of the storage unit described in FIG. 10.
  • the storage element can be one memory or a collective term for multiple memories.
  • the terminal device shown in FIG. 11 can implement various processes related to the terminal device in the method embodiment shown in FIG. 7 or FIG. 9.
  • the operations and/or functions of each module in the terminal device shown in FIG. 11 are used to implement the corresponding processes in the foregoing method embodiments.
  • FIG. 12 is a schematic structural diagram of a network device provided by an embodiment of this application. It is used to implement the operation of the network device in the above embodiment.
  • the network equipment includes: an antenna 1201, a radio frequency device 1202, and a baseband device 1203.
  • the antenna 1201 is connected to the radio frequency device 1202.
  • the radio frequency device 1202 receives the information sent by the terminal device through the antenna 1201, and sends the information sent by the terminal device to the baseband device 1203 for processing.
  • the baseband device 1203 processes the information of the terminal device and sends it to the radio frequency device 1202, and the radio frequency device 1202 processes the information of the terminal device and sends it to the terminal device via the antenna 1201.
  • the baseband device 1203 may include one or more processing elements 12031, for example, a main control CPU and other integrated circuits.
  • the baseband device 1203 may also include a storage element 12032 and an interface 12033.
  • the storage element 12032 is used to store programs and data; the interface 12033 is used to exchange information with the radio frequency device 1202.
  • the interface is, for example, a common public radio interface. , CPRI).
  • the above apparatus for network equipment may be located in the baseband apparatus 1203.
  • the above apparatus for network equipment may be a chip on the baseband apparatus 1203.
  • the chip includes at least one processing element and an interface circuit, wherein the processing element is used to execute the above network. For each step of any method executed by the device, the interface circuit is used to communicate with other devices.
  • the unit for the network device to implement each step in the above method can be implemented in the form of a processing element scheduler.
  • the device for the network device includes a processing element and a storage element, and the processing element calls the program stored by the storage element to Perform the method performed by the network device in the above method embodiment.
  • the storage element may be a storage element with the processing element on the same chip, that is, an on-chip storage element, or a storage element on a different chip from the processing element, that is, an off-chip storage element.
  • the unit of the network device that implements each step in the above method may be configured as one or more processing elements, and these processing elements are arranged on the baseband device.
  • the processing elements here may be integrated circuits, such as one Or multiple ASICs, or, one or more DSPs, or, one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits can be integrated together to form a chip.
  • the units for the network equipment to implement each step in the above method can be integrated together and implemented in the form of a system-on-a-chip (SOC).
  • the baseband device includes the SOC chip for implementing the above method.
  • At least one processing element and storage element can be integrated in the chip, and the processing element can call the stored program of the storage element to implement the method executed by the above network device; or, at least one integrated circuit can be integrated in the chip to implement the above network The method executed by the device; or, it can be combined with the above implementations.
  • the functions of some units are implemented in the form of calling programs by processing elements, and the functions of some units are implemented in the form of integrated circuits.
  • the above apparatus for a network device may include at least one processing element and an interface circuit, wherein at least one processing element is used to execute any method performed by the network device provided in the above method embodiments.
  • the processing element can execute part or all of the steps executed by the network device in the first way: calling the program stored in the storage element; or in the second way: combining instructions through the integrated logic circuit of the hardware in the processor element Part or all of the steps performed by the network device are executed in the method; of course, part or all of the steps executed by the network device above can also be executed in combination with the first method and the second method.
  • the processing element here is the same as that described above, and can be implemented by a processor, and the function of the processing element can be the same as the function of the processing unit described in FIG. 10.
  • the processing element may be a general-purpose processor, such as a CPU, or one or more integrated circuits configured to implement the above method, such as: one or more ASICs, or, one or more microprocessors DSP , Or, one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms.
  • the storage element may be realized by a memory, and the function of the storage element may be the same as the function of the storage unit described in FIG. 12.
  • the storage element may be realized by a memory, and the function of the storage element may be the same as the function of the storage unit described in FIG. 10.
  • the storage element can be one memory or a collective term for multiple memories.
  • the network device shown in FIG. 12 can implement various processes related to the network device in the method embodiment shown in FIG. 7 or FIG. 9.
  • the operations and/or functions of the various modules in the network device shown in FIG. 12 are used to implement the corresponding processes in the foregoing method embodiments.
  • each step in the method provided in this embodiment can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • 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 or storage unit in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • 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 programs or instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer program or instruction may be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium.
  • the 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 integrating one or more available media.
  • the usable medium may be a magnetic medium, such as a floppy disk, a hard disk, and a magnetic tape; it may also be an optical medium, such as a DVD; and it may also be a semiconductor medium, such as a solid state disk (SSD).
  • the various illustrative logic units and circuits described in the embodiments of this application can be implemented by general-purpose processors, digital signal processors, application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, Discrete gates or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the described functions.
  • the general-purpose processor may be a microprocessor.
  • the general-purpose processor may also be any traditional processor, controller, microcontroller, or state machine.
  • the processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration. achieve.
  • the steps of the method or algorithm described in the embodiments of the present application can be directly embedded in hardware, a software unit executed by a processor, or a combination of the two.
  • the software unit can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other storage medium in the art.
  • the storage medium may be connected to the processor, so that the processor can read information from the storage medium, and can store and write information to the storage medium.
  • the storage medium may also be integrated into the processor.
  • the processor and the storage medium can be arranged in an ASIC, and the ASIC can be arranged in a terminal device.
  • the processor and the storage medium may also be provided in different components in the terminal device.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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Abstract

一种通信方法及装置，用于实现连接态的终端设备获取非必要系统信息。其中方法包括：获取终端设备的标识，向网络设备发送请求消息，请求消息包括所述终端设备的标识和第一信息，第一信息用于指示所述终端设备请求的系统信息；进而接收来自网络设备的系统信息。采用上述方法，一方面，连接态的终端设备可以通过向网络设备发送请求消息来获取系统信息；另一方面，由于终端设备向网络设备发送的请求消息中包括终端设备的标识，进而网络设备可以根据终端设备的标识，通过单播的方式发送终端设备请求的系统信息，避免通过广播方式发送系统信息而导致终端设备可能无法接收到系统信息的问题。

Description

一种通信方法及装置 技术领域
本申请涉及无线通信技术领域，特别涉及一种通信方法及装置。
背景技术
在无线通信系统中，网络设备可以向终端设备发送系统信息(system information，SI)，以通知终端设备有关系统的各种信息，例如，终端设备所处小区的网络信息、注册区域的信息、公共信道的信息、以及其它小区的信息等。
第五代(5th-generation，5G)通信系统中，根据网络设备发送SI的方式，可以将SI分为两种类型，即必要系统信息和非必要系统信息。其中，必要系统信息为网络设备通过周期性广播发送的系统信息，比如小区选择和初始接入信息；非必要系统信息为基于终端设备的需求而提供给终端设备的系统信息，比如用于定位的系统信息。
目前，主要是由空闲态的终端设备或非激活态的终端设备来请求非必要系统信息。然而，随着车对一切(vehicle to everything，V2X)技术的出现，对于连接态的终端设备也需要请求非必要系统信息，比如请求用于定位的系统信息。因此，针对于连接态的终端设备，如何获取非必要系统信息仍需进一步的研究。
发明内容
本申请提供了一种通信方法及装置，用于实现连接态的终端设备获取非必要系统信息。
第一方面，本申请实施例提供一种通信方法，该方法可以应用于终端设备，或者也可以应用于终端设备内部的芯片。在该方法中，可以先获取终端设备的标识，然后向网络设备发送请求消息，请求消息包括所述终端设备的标识和第一信息，第一信息用于指示所述终端设备请求的系统信息；进而接收来自网络设备的系统信息。其中，获取终端设备的标识，可以理解为与网络设备建立连接，或者，终端设备进入或处于连接态。
采用上述方法，一方面，连接态的终端设备可以通过向网络设备发送请求消息来获取系统信息；另一方面，由于终端设备向网络设备发送的请求消息中包括终端设备的标识，进而网络设备可以根据终端设备的标识，通过单播的方式发送终端设备请求的系统信息，避免通过广播方式发送系统信息而导致终端设备可能无法接收到系统信息的问题。
在一种可能的设计中，接收来自网络设备的所述系统信息，包括：接收来自网络设备的用于调度系统信息的第一下行控制信息，第一下行控制信息通过所述终端设备的标识加扰；进而根据第一下行控制信息，接收来自网络设备的系统信息。或者，接收来自网络设备的系统信息，包括：接收来自网络设备的第一下行控制信息，第一下行控制信息通过终端设备的标识加扰；进而在第一下行控制信息所指示的资源上，接收来自网络设备的系统信息。
采用上述方法，由于第一下行控制信息通过终端设备的标识加扰，因此该终端设备可以基于该终端设备的标识通过盲检过程接收到第一下行控制信息，而除该终端设备以外的其它终端设备，由于并不知晓该终端设备的标识，从而无法接收到第一下行控制信息，进而也无法在第一下行控制信息所指示的资源上接收系统信息，从而通过上述方式实现了将 系统信息单播给该终端设备。
在一种可能的设计中，第一信息包括多个比特，每个比特对应一个系统信息块或者对应一个系统消息，且所述比特的取值用于指示对应的系统信息块或系统消息是否被请求。
采用上述方法，能够明确指示出被请求的系统信息块或系统消息，且实现较为简单方便。
在一种可能的设计中，第一信息还包括指示信息，指示信息用于指示所述比特对应的系统信息的粒度。
采用上述方法，通过指示信息来指示比特对应的系统信息的粒度，从而使得指示方式更加灵活。
在一种可能的设计中，第一信息承载在MAC CE中。
采用上述方法，由于MAC CE的时延明显短于RRC信令的时延，从而能够有效提高请求系统信息的效率。
在一种可能的设计中，向网络设备发送请求信息，包括：向网络设备发送随机接入请求；接收随机接入请求的随机接入响应，随机接入响应包括上行授权；利用上行授权向网络设备发送请求消息。
在一种可能的设计中，该方法还包括：接收来自网络设备的用于调度竞争解决消息的第二下行控制信息，第二下行控制信息通过终端设备的标识或终端设备的TC-RNTI加扰；根据第二下行控制信息，接收竞争解决消息。
在一种可能的设计中，所述随机接入响应还包括定时提前命令；该方法还包括：根据所述定时提前命令，更新所述终端设备的定时提前量，并启动或重启定时器。在定时器超时之前，更新后的定时提前量有效。
采用上述方法，对于空闲态或非激活态的终端设备，当其通过随机接入过程的第3消息请求系统信息时，在竞争解决成功后，终端设备通常不再维护定时提前量，比如停止定时器。而本申请实施例中，对于连接态的终端设备，在竞争解决成功后，终端设备可以继续维护定时提前量，即在定时器超时前，定时提前量始终是有效的，从而能够有效避免定时提前量失效而影响上行数据传输。
在一种可能的设计中，终端设备的标识为所述终端设备的C-RNTI。
第二方面，本申请实施例提供一种通信方法，该方法可以应用于网络设备，或者也可以应用于网络设备内部的芯片。在该方法中，接收来自终端设备的请求消息，所述终端设备处于连接态，所述请求消息包括所述终端设备的标识和第一信息，所述第一信息用于指示所述终端设备请求的系统信息；进而根据所述终端设备的标识，发送所述系统信息。
采用上述方法，一方面，连接态的终端设备可以通过向网络设备发送请求消息来获取系统信息；另一方面，由于请求消息中包括终端设备的标识，进而网络设备可以根据终端设备的标识，通过单播的方式发送终端设备请求的系统信息，避免通过广播方式发送系统信息而导致终端设备可能无法接收到系统信息的问题。
在一种可能的设计中，根据所述终端设备的标识，发送所述系统信息，包括：发送用于调度所述系统信息的第一下行控制信息，所述第一下行控制信息通过所述终端设备的标识加扰；发送所述系统信息。或者，根据所述终端设备的标识，发送所述系统信息，包括：发送第一下行控制信息，第一下行控制信息通过所述终端设备的标识加扰；在第一控制信息所指示的资源上发送所述系统信息。
采用上述方法，由于第一下行控制信息通过终端设备的标识加扰，因此该终端设备可以基于该终端设备的标识通过盲检过程接收到第一下行控制信息，而除该终端设备以外的其它终端设备，由于并不知晓该终端设备的标识，从而无法接收到第一下行控制信息，进而也无法在第一下行控制信息所指示的资源上接收系统信息，因此，网络设备通过使用终端设备的标识对第一下行控制信息进行加扰，实现了将系统信息单播给该终端设备。
在一种可能的设计中，第一信息包括多个比特，每个比特对应一个系统信息块或者对应一个系统消息，且所述比特的取值用于指示对应的系统信息块或系统消息是否被请求。
在一种可能的设计中，所述第一信息还包括指示信息，所述指示信息用于指示所述比特对应的系统信息的粒度。
在一种可能的设计中，所述第一信息承载在MAC CE中。
在一种可能的设计中，接收来自所述终端设备的请求消息，包括：接收来自所述终端设备的随机接入请求；发送所述随机接入请求的随机接入响应，所述随机接入响应包括上行授权；接收所述终端设备利用所述上行授权发送的所述请求消息。
在一种可能的设计中，所述方法还包括：发送用于调度竞争解决消息的第二下行控制信息，所述第二下行控制信息通过所述终端设备的标识或所述终端设备的TC-RNTI加扰；发送所述竞争解决消息。
在一种可能的设计中，所述随机接入响应还包括定时提前命令；所述方法还包括：启动或重启定时器。
在一种可能的设计中，所述终端设备的标识为所述终端设备的C-RNTI。
需要说明的是，由于第二方面所描述的通信方法与第一方面所描述的通信方法相对应，因此第二方面所涉及的相关技术特征的有益效果可以参见第一方面的描述，上文中未再赘述。
第三方面，本申请实施例提供一种通信方法，该方法可以应用于终端设备，或者也可以应用于终端设备内部的芯片。在该方法中，可以先与网络设备建立连接，并向网络设备发送请求消息，请求消息用于请求系统信息，请求消息承载在所述系统信息对应的随机接入资源上；进而接收网络设备根据所述请求消息发送的响应消息，响应消息包括定时提前命令；根据定时提前命令，更新终端设备的定时提前量，启动或重启定时器；以及，接收网络设备发送的系统信息。
采用上述方法，终端设备向网络设备发送请求消息，请求信息承载在请求的系统信息对应的随机接入资源上，并接收网络设备发送的响应消息，响应消息中包括定时提前命令，从而使得终端设备可以及时更新定时提前量，保证上行数据传输正常。
第四方面，本申请实施例提供一种通信方法，该方法可以应用于网络设备，或者也可以应用于网络设备内部的芯片。在该方法中，所述方法包括：与终端设备建立连接，并接收终端设备发送的请求消息，请求消息用于请求系统信息，请求消息承载在所述系统信息对应的随机接入资源上；向终端设备发送响应消息，响应消息包括定时提前命令；以及，发送系统信息。
采用上述方法，网络设备发送的响应消息包括定时提前命令，从而使得终端设备可以及时更新定时提前量，保证上行数据传输正常。
第五方面，本申请提供一种通信装置，所述通信装置可以为终端设备或者设置在终端设备内部的芯片。所述通信装置具备实现上述第一方面或第三方面的功能，比如，所述通 信装置包括执行上述第一方面或第三方面涉及步骤所对应的模块或单元或手段(means)，所述功能或单元或手段可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现。
在一种可能的设计中，所述通信装置包括处理单元、通信单元，其中，通信单元可以用于收发信号，以实现该通信装置和其它装置之间的通信，比如，通信单元用于接收来自网络设备的系统信息；处理单元可以用于执行该通信装置的一些内部操作。处理单元、通信单元执行的功能可以和上述第一方面或第三方面涉及的步骤相对应。
在一种可能的设计中，所述通信装置包括处理器，还可以包括收发器，所述收发器用于收发信号，所述处理器执行程序指令，以完成上述第一方面或第三方面中任意可能的设计或实现方式中的方法。其中，所述通信装置还可以包括一个或多个存储器，所述存储器用于与处理器耦合。所述一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置，本申请并不限定。存储器可以保存实现上述第一方面或第三方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第一方面或第三方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和存储器，存储器可以保存实现上述第一方面或第三方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第一方面或第三方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括至少一个处理器和接口电路，其中，至少一个处理器用于通过所述接口电路与其它装置通信，并执行上述第一方面或第三方面任意可能的设计或实现方式中由终端设备执行的方法。
第六方面，本申请提供一种通信装置，所述通信装置可以为网络设备或者设置在网络设备内部的芯片。所述通信装置具备实现上述第二方面或第四方面涉及的功能，比如，所述通信装置包括执行上述第二方面或第四方面涉及步骤所对应的模块或单元或手段，所述功能或单元或手段可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现。
在一种可能的设计中，所述通信装置包括处理单元、通信单元，其中，通信单元可以用于收发信号，以实现该通信装置和其它装置之间的通信，比如，通信单元用于向终端设备发送系统信息；处理单元可以用于执行该通信装置的一些内部操作。处理单元、通信单元执行的功能可以和上述第二方面或第四方面涉及的步骤相对应。
在一种可能的设计中，所述通信装置包括处理器，还可以包括收发器，所述收发器用于收发信号，所述处理器执行程序指令，以完成上述第二方面或第四方面中任意可能的设计或实现方式中的方法。其中，所述通信装置还可以包括一个或多个存储器，所述存储器用于与处理器耦合。所述一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置，本申请并不限定。存储器可以保存实现上述第二方面或第四方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第二方面或第四方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和存储器，存储器可以保存实现上述 第二方面或第四方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第二方面或第四方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括至少一个处理器和接口电路，其中，至少一个处理器用于通过所述接口电路与其它装置通信，并执行上述第二方面或第四方面任意可能的设计或实现方式中的方法。
第七方面，本申请提供一种计算机可读存储介质，所述计算机存储介质中存储有计算机可读指令，当计算机读取并执行所述计算机可读指令时，使得计算机执行上述第一方面至第四方面的任一种可能的设计中的方法。
第八方面，本申请提供一种计算机程序产品，当计算机读取并执行所述计算机程序产品时，使得计算机执行上述第一方面至第四方面的任一种可能的设计中的方法。
第九方面，本申请提供一种芯片，所述芯片包括处理器，所述处理器与存储器耦合，用于读取并执行所述存储器中存储的软件程序，以实现上述第一方面至第四方面的任一种可能的设计中的方法。
本申请的这些方面或其它方面在以下实施例的描述中会更加简明易懂。
附图说明
图1为本申请实施例适用的一种网络架构示意图；
图2为本申请实施例适用的又一种网络架构示意图；
图3为本申请实施例适用的又一种网络架构示意图；
图4为本申请实施例提供的一种随机接入过程示意图；
图5为本申请实施例提供的又一种随机接入过程示意图；
图6为本申请实施例提供的上行同步示意图；
图7为本申请实施例一提供的通信方法所对应的流程示意图；
图8a为本申请实施例提供的承载第一信息的MAC CE的一种格式示意图；
图8b为本申请实施例提供的承载第一信息的MAC CE的又一种格式示意图；
图8c为本申请实施例提供的承载第一信息的MAC CE的又一种格式示意图；
图9为本申请实施例二提供的通信方法所对应的流程示意图；
图10为本申请实施例中所涉及的装置的可能的示例性框图；
图11为本申请实施例提供的一种终端设备的结构示意图；
图12为本申请实施例提供的一种网络设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。
首先，对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
(1)终端设备：可以是能够接收网络设备调度和指示信息的无线终端设备，无线终端设备可以是指向用户提供语音和/或数据连通性的设备，或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其他处理设备。终端设备可以经无线接入网(如，radio access  network，RAN)与一个或多个核心网或者互联网进行通信，终端设备可以是移动终端设备，如移动电话(或称为“蜂窝”电话，手机(mobile phone))、计算机和数据卡，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。例如，个人通信业务(personal communication service，PCS)电话、无绳电话、会话发起协议(SIP)话机、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、平板电脑(Pad)、带无线收发功能的电脑等设备。无线终端设备也可以称为系统、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、移动台(mobile station，MS)、远程站(remote station)、接入点(access point，AP)、远程终端设备(remote terminal)、接入终端设备(access terminal)、用户终端设备(user terminal)、用户代理(user agent)、用户站(subscriber station，SS)、用户端设备(customer premises equipment，CPE)、终端(terminal)、用户设备(user equipment，UE)、移动终端(mobile terminal，MT)等。终端设备也可以是可穿戴设备以及下一代通信系统，例如，5G通信系统中的终端设备或者未来演进的公共陆地移动网络(public land mobile network，PLMN)中的终端设备等。
(2)网络设备：是无线网络中的设备，例如网络设备可以为将终端设备接入到无线网络的无线接入网(radio access network，RAN)节点(或设备)，又可以称为基站。目前，一些RAN设备的举例为：5G通信系统中的新一代基站(generation Node B，gNodeB)、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wi-Fi)接入点(access point，AP)等。另外，在一种网络结构中，网络设备可以包括集中单元(centralized unit，CU)节点、或分布单元(distributed unit，DU)节点、或包括CU节点和DU节点的RAN设备。此外，在其它可能的情况下，网络设备可以是其它为终端设备提供无线通信功能的装置。本申请的实施例对网络设备所采用的具体技术和具体设备形态不做限定。为方便描述，本申请实施例中，为终端设备提供无线通信功能的装置称为网络设备。
(3)本申请实施例中的术语“系统”和“网络”可被互换使用。“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“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的情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如“A，B和C中的至少一个”包括A，B，C，AB，AC，BC或ABC。
以及，除非有特别说明，本申请实施例提及“第一”、“第二”等序数词是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。例如，第一信息和第二信息，只是为了区分不同的信息，而并不是表示这两种信息的优先级或者重要程度等的不同。
图1为本申请实施例适用的一种网络架构示意图。如图1所示，终端设备130可接入 到无线网络，以通过无线网络获取外网(例如因特网)的服务，或者通过无线网络与其它设备通信，如可以与其它终端设备通信。该无线网络包括无线接入网(radio access network，RAN)设备110和核心网(core network，CN)设备120，其中RAN设备110用于将终端设备130接入到无线网络，CN设备120用于对终端设备进行管理并提供与外网通信的网关。应理解，图1所示的通信系统中各个设备的数量仅作为示意，本申请实施例并不限于此，实际应用中在通信系统中还可以包括更多的终端设备130、更多的RAN设备110，还可以包括其它设备。
CN中可以包括多个CN设备120，当图1所示的网络架构适用于5G通信系统时，CN设备120可以为接入和移动性管理功能(access and mobility management function，AMF)实体、会话管理功能(session management function，SMF)实体或用户面功能(user plane function，UPF)实体等，当图1所示的网络架构适用于长期演进(long term evolution，LTE)通信系统时，CN设备120可以为移动性管理实体(mobility management entity，MME)和服务网关(serving gateway，S-GW)等。
图2为本申请实施例适用的又一种网络架构示意图。如图2所示，该网络架构包括CN设备、RAN设备和终端设备。其中，RAN设备包括基带装置和射频装置，其中基带装置可以由一个节点实现，也可以由多个节点实现，射频装置可以从基带装置拉远独立实现，也可以集成在基带装置中，或者部分拉远部分集成在基带装置中。例如，在LTE通信系统中，RAN设备(eNB)包括基带装置和射频装置，其中射频装置可以相对于基带装置拉远布置，例如射频拉远单元(remote radio unit，RRU)相对于BBU拉远布置。
RAN设备和终端设备之间的通信遵循一定的协议层结构，例如控制面协议层结构可以包括无线资源控制(radio resource control，RRC)层、分组数据汇聚层协议(packet data convergence protocol，PDCP)层、无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理层等协议层的功能；用户面协议层结构可以包括PDCP层、RLC层、MAC层和物理层等协议层的功能；在一种可能的实现中，PDCP层之上还可以包括业务数据适配(service data adaptation protocol，SDAP)层。
RAN设备可以由一个节点实现RRC、PDCP、RLC和MAC等协议层的功能，或者可以由多个节点实现这些协议层的功能。例如，在一种演进结构中，RAN设备可以包括CU)和DU，多个DU可以由一个CU集中控制。如图2所示，CU和DU可以根据无线网络的协议层划分，例如PDCP层及以上协议层的功能设置在CU，PDCP以下的协议层，例如RLC层和MAC层等的功能设置在DU。
这种协议层的划分仅仅是一种举例，还可以在其它协议层划分，例如在RLC层划分，将RLC层及以上协议层的功能设置在CU，RLC层以下协议层的功能设置在DU；或者，在某个协议层中划分，例如将RLC层的部分功能和RLC层以上的协议层的功能设置在CU，将RLC层的剩余功能和RLC层以下的协议层的功能设置在DU。此外，也可以按其它方式划分，例如按时延划分，将处理时间需要满足时延要求的功能设置在DU，不需要满足该时延要求的功能设置在CU。
此外，射频装置可以拉远，不放在DU中，也可以集成在DU中，或者部分拉远部分集成在DU中，在此不作任何限制。
图3为本申请实施例适用的又一种网络架构示意图。相对于图2所示的网络架构，图3中还可以将CU的控制面(CP)和用户面(UP)分离，分成不同实体来实现，分别为控 制面(control plane，CP)CU实体(即CU-CP实体)和用户面(user plane，UP)CU实体(即CU-UP实体)。
在以上网络架构中，CU产生的信令可以通过DU发送给终端设备，或者终端设备产生的信令可以通过DU发送给CU。DU可以不对该信令进行解析而直接通过协议层封装而透传给终端设备或CU。以下实施例中如果涉及这种信令在DU和终端设备之间的传输，此时，DU对信令的发送或接收包括这种场景。例如，RRC或PDCP层的信令最终会处理为PHY层的信令发送给终端设备，或者，由接收到的PHY层的信令转变而来。在这种架构下，该RRC或PDCP层的信令，即也可以认为是由DU发送的，或者，由DU和射频装载发送的。
上述图1、图2或图3所示意的网络架构可以适用于各种无线接入技术(radio access technology，RAT)的通信系统中，例如可以是LTE通信系统，也可以是5G(或者称为新无线(new radio，NR))通信系统，也可以是LTE通信系统与5G通信系统之间的过渡系统，该过渡系统也可以称为4.5G通信系统，当然也可以是未来的通信系统。本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着通信网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。本申请以下实施例中的装置，根据其实现的功能，可以位于终端设备或网络设备。当采用以上CU-DU的结构时，网络设备可以为CU或DU或包括CU和DU的RAN设备。
下面对本申请实施例所涉及的相关技术特征进行介绍。
一、随机接入过程
随机接入过程是指从终端设备发送随机接入信号开始尝试接入网络，到与网络设备建立起基本的信令连接之前的过程。随机接入信号可用于发起随机接入过程，例如随机接入信号可以为随机接入前导码(random access preamble)。可选地，随机接入信号还可以为解调参考信号(demodulation reference signal，DMRS)。终端设备可通过随机接入过程与网络设备进行信息交互，实现与通信系统的上行时间同步。本申请实施例中，随机接入过程也可以称为随机接入或随机接入信道过程或随机接入方式，本申请对此不做区分，下文描述中可替代使用。
(1)随机接入过程的触发
触发随机接入过程的事件(或场景)可以有多种，比如：①终端设备初始接入，即终端设备由无线资源控制(radio resource control，RRC)空闲(idle)态到RRC连接(connection)态时建立无线连接；②非激活(Inactive)态下上行(uplink，UL)数据到达，此时上行处于“不同步”状态；或，非激活态下下行(downlink，DL)数据到达，此时上行处于“不同步”状态。
下面对空闲态、连接态和非激活态进行说明。
空闲态：终端设备经过初始随机接入过程接入网络设备后，网络设备可以存储该终端设备的设备参数，如果终端设备较长时间未与网络设备通信，网络设备便将存储的终端设备的设备参数删除，此时终端设备所处的状态即为空闲态。处于空闲状态的终端设备如果需要与网络设备通信，需要再次发起随机接入过程。
连接态：终端设备经过初始随机接入过程接入网络设备后，网络设备中可以存储该终端设备的设备参数，在此期间，终端设备可以与网络设备通信，此时终端设备所处的状态即为连接态。通常，终端设备处于连接态的时间较短，网络设备检测到终端设备在一段时间内未与网络设备通信后，会删除网络设备中存储的终端设备的设备参数，即终端设备由连接态转变为空闲态。
非激活态：处于非激活态的终端设备与网络设备断开了RRC连接，不需要连续监听下行数据，从而达到与空闲态一样的省电效果，但处于非激活态的终端设备和网络设备均保存终端设备的上下文信息，当终端设备需要进入连接态时，网络设备可以基于保存的上下文信息配置非激活态的终端设备进入到连接态，从而减少时延和节省信令开销。
(2)随机接入过程包括的步骤
根据终端设备发送的前导码是否是由终端设备自身选择，可以将随机接入过程划分为基于竞争的随机接入过程和基于非竞争的随机接入过程。其中，基于竞争的随机接入过程，可以由终端设备选择前导码；基于非竞争的随机接入过程，可以由网络设备为终端设备分配前导码。
针对基于竞争的随机接入过程，下面结合图4描述空闲态或非激活态的终端设备发起的随机接入过程所包括的一些步骤。图4为本申请实施例提供的一种随机接入过程示意图。如图4所示，本申请实施例提供的随机接入过程包括如下步骤。
步骤400：网络设备向终端设备发送随机接入配置信息，则终端设备可接收来自网络设备的随机接入配置信息。该步骤可以为用于执行随机接入过程之前的准备工作，不属于随机接入过程包括的步骤。
此处，随机接入配置信息可用于配置随机接入参数，随机接入参数可以包括随机接入前导码集合。
步骤401：终端设备向网络设备发送随机接入请求，随机接入请求可以包括随机接入前导码，则网络设备从终端设备接收随机接入前导码。其中，该随机接入请求又被称为随机接入过程中的第1消息或消息1(MSG1)。
此处，终端设备向网络设备发送的随机接入前导码可以为终端设备从步骤400中获取到的用于随机接入的随机接入前导码集合中选择的一个随机接入前导码。
步骤402：网络设备在检测到终端设备发送的随机接入前导码后，向终端设备发送随机接入响应(random access response，RAR)，则终端设备从网络设备接收随机接入响应，其中，随机接入响应又被称为随机接入过程中的第2消息或消息2(MSG2)。
示例性地，第2消息可以包括定时提前命令(timing advance command，TAC)、上行授权(uplinkgrant)和临时小区无线网络临时标识(temporary cell-radio network temporary identifier，TC-RNTI)等。其中，上行授权即网络设备为该终端装置分配的上行资源的指示信息或者说上行授权用于指示网络设备为终端设备分配的上行资源，TC-RNTI为网络设备为终端设备分配的临时标识。
步骤403：终端设备向网络设备发送上行信令，则网络设备从终端设备接收该上行信令。其中，该上行信令又被称为随机接入过程中的第3消息或消息3(MSG3)。
示例性地，终端设备可以根据TAC所指示的定时提前(timing advance，TA)量，在上行授权所指示的上行资源上发送第3消息。
此处，针对于处于空闲态或者非激活态的终端设备来说，其发送的第3消息可以包括 公用控制信道(common control channel，CCCH)信息。
步骤404：网络设备检测到第3消息，并向终端设备发送竞争解决消息(contention resolution message，CRM)，相应地，终端设备可以从网络设备接收竞争解决消息，其中，竞争解决消息又被称为第4消息或消息4(MSG4)。
此处，网络设备在向终端设备发送竞争解决消息时，可采用TC-RNTI对用于调度竞争解决消息的下行控制信息进行加扰。相应地，终端设备若在竞争解决计时器超时前，监听到该TC-RNTI加扰的下行控制信息，则可以将竞争解决标识(contention resolution identifier，CRID)与终端设备的第3消息携带的公共控制信道信息进行匹配，如果匹配成功，则终端设备认为竞争解决成功，即随机接入成功；否则，终端设备认为此次随机接入失败。
针对基于非竞争的随机接入过程，下面结合图5描述空闲态或非激活态的终端设备发起的随机接入过程所包括的一些步骤。图5为本申请实施例提供的又一种随机接入过程示意图。如图5所示，本申请实施例提供的随机接入过程包括如下步骤。
步骤500，网络设备向终端设备发送随机接入配置信息，则终端设备可接收来自网络设备的随机接入配置信息。该步骤可以为用于执行随机接入过程之前的准备工作，不属于随机接入过程包括的步骤。
此处，随机接入配置信息可用于为终端设备分配专用的随机接入前导码。
步骤501：终端设备向网络设备发送随机接入请求，随机接入请求可以包括随机接入前导码，则网络设备从终端设备接收随机接入前导码。其中，该随机接入请求又被称为随机接入过程中的第1消息或消息1。
此处，终端设备向网络设备发送的随机接入前导码可以为网络设备为终端设备分配的专用的随机接入前导码。
步骤502：网络设备在检测到终端设备发送的随机接入前导码后，向终端设备发送随机接入响应，则终端设备从网络设备接收随机接入响应，并确定此次随机接入成功。其中，随机接入响应又被称为随机接入过程中的第2消息或消息2。
由此可以看出，基于非竞争的随机接入过程可以不包括第3消息和第4消息。
需要说明的是，空闲态的终端设备可以通过图4或图5所描述的随机接入过程完成初始接入，非激活态的终端设备可以通过图4或图5所描述的随机接入过程与网络设备建立上行同步。在其它可能的情形中，空闲态或非激活态的终端设备还可以通过随机接入过程请求系统信息，可以参见下文的描述。
二、定时提前
上行数据传输的一个重要特征是不同终端设备在时频上正交多址接入，即来自同一小区的不同终端设备的上行数据传输之间互不干扰。为了保证上行数据传输的正交性，避免小区内干扰，网络设备要求来自同一子帧但不同频域资源的不同终端设备的信号到达网络设备的时间基本上是对齐的。若网络设备在循环前缀(cyclic prefix，CP)范围内接收到终端设备发送的上行数据，则能够正确地解码上行数据，因此，上行同步要求来自同一子帧的不同终端设备的信号到达网络的时间都落在CP之内。
为实现上行同步，终端设备可以根据定时提前(timing advance，TA)量调整上行传输时间，从而使得各个终端设备发送的上行数据到达网络设备的时间是对齐的。比如图6为上行同步的一种示例图，如图6所示，为了使网络设备在T0时刻接收到上行数据，终端设备1需要根据TA1在T1时刻进行上行传输，终端设备2需要根据TA2在T2时刻进行 上行传输。
示例性地，网络设备可以向终端设备发送定时提前命令，比如网络设备可以根据终端设备发送的随机接入前导码来估计终端设备的定时提前量，进而向终端设备发送定时提前命令；相应地，终端设备可以根据定时提前命令得到定时提前量。网络设备在给终端设备发送定时提前命令后会开启一个定时提前定时器(time advance timer，TA timer)，终端设备得到定时提前量后也会开启一个相同的TA timer，网络设备和终端设备均维持TA timer，可以根据TA timer是否超时来判断定时提前量是否有效。如果TA timer未超时，则认为定时提前量是有效的，反之，认为定时提前量是无效的。当终端设备有上行数据要进行传输时，若确定TA timer未超时，即确定定时提前量有效，则可以在预配置的上行资源上按照预先规定的发送方式进行上行数据传输。需要说明的是，本申请实施例中所涉及的“定时提前量是有效的”或“定时提前量有效”可以理解为定时提前量是准确的，即可以保证终端设备采用该定时提前量发送的上行数据可以与其他终端设备发送的上行数据到达网络设备的时间相同，从而避免终端设备之间的干扰。本申请实施例中所涉及的“定时提前量是无效的”或“定时提前量无效”可以理解为定时提前量是不准确的，终端设备采用该定时提前量发送的上行数据与其他终端设备发送的上行数据到达网络设备的时间不相同，从而可能造成终端设备之间的干扰。
三、系统信息
在图1、图2或图3所示意的网络架构中，网络设备可以向终端设备发送系统信息，以通知终端设备有关系统的各种信息，具体来说，网络设备可以采用广播的方式，将系统信息发送给终端设备。然而，考虑到若是所有的系统信息都通过广播的方式来发送，则会占用大量资源，因此，5G通信系统中提出将系统信息划分为两种类型，即为必要系统信息和非必要系统信息，必要系统信息可以周期性广播，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，以节约资源。非必要系统信息也可以称为按需(on demand)系统信息。
(1)系统信息块
系统信息可以包括主信息块(master information block，MIB)、系统信息块一(system information block 1，SIB1)和除系统信息块一之外的其他系统信息块(比如用于定位的系统信息块)；系统信息块一中可以包括其它系统信息块的调度信息，用于定位的系统信息块也可以称为定位系统信息块(positioning system information block，posSIB)。其中，主信息块和系统信息块一为必要系统信息，必要系统信息也可以称为最小系统信息(minimum SI)；除了SIB1之外的其他系统信息块为非必要系统信息，非必要系统信息也可以称为其他系统信息(other SI)。
(2)系统消息
系统消息也可以称为系统信息消息(SI message)，用于承载系统信息块。一个系统消息中可以包括一个或多个系统信息块，系统信息块和系统消息之间的映射关系(即一个系统消息中包括哪些系统信息块)可以包括在系统信息块一中。
(3)非必要系统信息的发送
网络设备可以通过按需方式发送非必要系统信息，对此可以理解为是根据终端设备的请求来发送非必要系统信息。例如，在终端设备需要获得系统信息a、且系统信息a的广播状态为“不广播”的情况下，终端设备可以向网络设备发起系统信息a的获取请求，进 而网络设备可以根据获取请求发送系统信息a。其中，系统信息的广播状态可以为网络设备预先配置给终端设备的，如果系统信息的广播状态为“不广播”，也就表明网络设备不会周期性广播该系统信息。
考虑到非必要系统信息通常为空闲态或非激活态的终端设备需要请求的系统信息，因此，5G通信系统中只支持空闲态或非激活态的终端设备请求非必要系统信息。示例性地，对于空闲态或非激活态的终端设备来说，可以在随机接入过程中向网络设备请求系统信息，进而网络设备可以通过广播的方式发送终端设备请求的系统信息。例如，终端设备可以通过随机接入过程中的第1消息(可以是基于竞争的随机接入过程中的第1消息，或者也可以是基于非竞争的随机接入过程中的第1消息)向网络设备请求系统信息，或者可以通过随机接入过程中的第3消息(可以是基于竞争的随机接入过程中的第3消息)向网络设备请求系统信息。其中，终端设备通过随机接入过程中的第1消息向网络设备请求系统信息的方式也可以称为基于Msg1(Msg1 based)的方式，终端设备通过随机接入过程中的第3消息向网络设备请求系统信息的方式也可以称为基于Msg3(Msg3 based)的方式。
基于上述对相关技术特征的描述可知，目前针对于连接态的终端设备，如何请求系统信息，尚没有明确的方案。若是沿用上述空闲态或非激活态的终端设备请求系统信息的方式，可能会存在一些问题。比如，终端设备a处于连接态，当终端设备a通过随机接入过程中的第3消息来请求系统信息时，网络设备是通过广播方式来发送终端设备a请求的系统信息，从而可能导致终端设备a接收不到其所请求的系统信息(比如若网络设备为终端设备a激活的带宽部分(bandwidth part，BWP)并未配置系统信息的公共搜索空间，则终端设备将无法获得网络设备通过广播方式发送的系统信息)。又比如，终端设备b处于连接态，当终端设备b通过随机接入过程中的第1消息来请求系统信息时，可能导致终端设备b无法及时更新定时提前量，进而影响上行数据传输。
基于此，本申请实施例提供一种通信方法，用于实现连接态的终端设备获取非必要系统信息。示例性地，本申请实施例提供的通信方法可以包括两种可能的方案，为便于描述，称为方案一、方案二。在方案一中，终端设备(处于连接态)向网络设备发送用于请求系统信息的请求消息，请求消息中包括终端设备的标识，从而使得网络设备可以基于终端设备的标识通过单播的方式发送终端设备请求的系统信息，避免通过广播方式发送系统信息而导致终端设备可能无法接收到系统信息的问题。在方案二中，终端设备(处于连接态)向网络设备发送请求消息，请求信息承载在请求的系统信息对应的随机接入资源上，并接收网络设备发送的响应消息，响应消息中包括定时提前命令，从而使得终端设备可以及时更新定时提前量，保证上行数据传输正常。
实施例一
在实施例一中，将基于上述方案一描述通信方法的一种可能的实现。
图7为本申请实施例一提供的通信方法所对应的流程示意图，如图7所示，包括：
步骤701，终端设备获取终端设备的标识。
此处，终端设备的标识可以为终端设备的小区无线网络临时标识(cell radio network temporary identifier，C-RNTI)。
示例性地，终端设备可以通过随机接入过程(为便于描述，此处称为第一随机接入过 程；第一随机接入过程可以为基于竞争的随机接入过程或基于非竞争的随机接入过程)获取终端设备的标识。以第一随机接入过程为基于竞争的随机接入过程为例，终端设备可以向网络设备发送第一随机接入过程的随机接入请求，进而接收来自网络设备的随机接入响应，随机接入响应中包括TC-RNTI(为便于描述，称为第一TC-RNTI)和上行授权；终端设备可以在上行授权所指示的资源上向网络设备发送上行信令，进而根据第一TC-RNTI接收网络设备发送的竞争解决消息；当竞争解决成功后，终端设备的第一TC-RNTI转变为终端设备的C-RNTI，也就是说，终端设备获取到了C-RNTI。
本申请实施例中，竞争解决成功意味着随机接入成功，也意味着终端设备与网络设备建立了连接，也意味着终端设备由空闲态或非激活态进入连接态。因此，上述终端设备获取终端设备的标识，也可以理解为，终端设备与网络设备建立连接，或者终端设备进入或处于连接态。
步骤702，终端设备向网络设备发送请求消息，请求消息包括终端设备的C-RNTI和第一信息，第一信息可以用于指示终端设备请求的系统信息。
相应地，在步骤703中，网络设备接收来自终端设备的请求消息。
此处，终端设备的C-RNTI可以承载在媒体接入控制控制元素(medium access control control element，MAC CE)中，或者也可以承载在RRC信令中，具体不做限定。第一信息可以承载在MAC CE中，或者也可以承载在RRC信令中，具体不做限定。在一个示例中，若终端设备的C-RNTI和第一信息均承载在MAC CE中，则终端设备的C-RNTI和第一信息可以承载在同一MAC CE中，或者也可以承载在不同MAC CE中。在又一个示例中，若终端设备的C-RNTI和第一信息均承载在RRC信令中，则终端设备的C-RNTI和第一信息可以承载在同一RRC信令中，或者也可以承载在不同RRC信令中。在又一个示例中，终端设备的C-RNTI可以承载在MAC CE中，而第一信息承载在RRC信令中；或者，终端设备的C-RNTI可以承载在RRC信令中，而第一信息承载在MAC CE中；此种情形下，请求消息可以包括MAC CE和RRC信令。
示例性地，第一信息指示终端设备请求的系统信息的方式可以有多种，下面描述三种可能的方式。
方式1
第一信息可以包括比特位图，比特位图中包括多个比特，每个比特可以对应一个系统信息块，每个比特的取值用于指示对应的系统信息块是否被请求；比如，以比特1为例，若比特1的取值为1，则表示比特1对应的系统信息块被请求，若比特1的取值为0，则表示比特1对应的系统信息块未被请求。此种情形下，第一信息所包括的比特的个数可以与系统信息块一中配置的系统信息块的个数有关，比如，第一信息所包括的比特的个数等于系统信息块一中配置的系统信息块的个数。
以第一信息承载在MAC CE中为例，假设系统信息块一中配置的系统信息块的个数为K，则第一信息可以包括K个比特(分别表示为T 0至T K)，进而可知MAC CE包括的字节个数
Figure PCTCN2019116333-appb-000001
其中，
Figure PCTCN2019116333-appb-000002
表示向上取整；一个字节的长度等于1个八位组(octet)的长度，即为8个比特。参见图8a所示，为MAC CE的一种格式示例。
举个例子，K＝20，则N＝3，此种情形下，Oct N(即第N个字节)中最后3个比特(即从右往左的最后3个比特)可以为保留位(reserved)。
方式2
第一信息可以包括比特位图，比特位图中包括多个比特，每个比特可以对应一个系统消息，每个比特的取值用于指示对应的系统消息是否被请求；比如，以比特1为例，若比特1的取值为1，则表示比特1对应的系统消息被请求，若比特1的取值为0，则表示比特1对应的系统消息未被请求。此种情形下，第一信息所包括的比特的个数可以与系统信息块一中配置的系统消息的个数有关，比如，第一信息所包括的比特的个数等于系统信息块一中配置的系统消息的个数。
以第一信息承载在MAC CE中为例，假设系统信息块一中配置的系统消息的个数为P，则第一信息可以包括P个比特(分别表示为T 0至T P)，进而可知MAC CE包括的字节个数
Figure PCTCN2019116333-appb-000003
参见图8b所示，为MAC CE的一种格式示例。
举个例子，P＝20，则L＝3，此种情形下，Oct L(即第L个字节)中最后3个比特(即从右往左的最后3个比特)可以为保留位(reserved)。
方式3
第一信息可以包括比特位图和指示信息，比特位图中包括多个比特，指示信息用于指示每个比特对应的系统信息的粒度，系统信息的粒度可以为系统信息块或系统消息。若指示信息指示每个比特对应的系统信息的粒度为系统信息块，则每个比特可以对应一个系统信息块；若指示信息指示每个比特对应的系统信息的粒度为系统消息，则每个比特可以对应一个系统消息。示例性地，指示信息可以包括1个比特，比如，当该比特的取值为1时，表示每个比特对应的系统信息的粒度为系统信息块；当该比特的取值为0时，表示每个比特对应的系统信息的粒度为系统消息。需要说明的是，系统信息的粒度还可以为其它可能的单位，此处是以系统信息的粒度为系统信息块或系统消息为例进行说明。
以第一信息承载在MAC CE中为例，假设MAC CE包括的字节个数为J。如图8c所示，为MAC CE的一种格式示例。图8c中，字段I用于承载指示信息，字段I可以包括1个比特，R表示保留位。当指示信息指示每个比特对应的系统信息的粒度为系统信息块时，J等于N；当指示信息指示每个比特对应的系统信息的粒度为系统消息时，J等于L。
需要说明的是，上述示例性描述了三种可能的方式，在其它实施例中，第一信息还可以通过其它可能的方式来指示请求的系统信息，本申请实施例对此不做限定。
示例性地，终端设备向网络设备发送请求消息的方式可以有多种。比如终端设备可以通过随机接入过程(为便于描述，此处称为第二随机接入过程；第二随机接入过程可以为基于竞争的随机接入过程)向网络设备发送请求消息，此种情形下，具体实现可以包括如下步骤：
步骤1，终端设备可以向网络设备发送第二随机接入过程的随机接入请求，随机接入请求包括随机接入前导码，随时接入请求可以用于发起随机接入；进而网络设备可接收来自终端设备的随机接入前导码。
步骤2，网络设备接收到随机接入请求后，可以发送随时接入响应，随机接入响应中可以包上行授权；进而终端设备可接收来自网络设备的随时接入响应。
示例性地，随机接入响应中还可以包括TC-RNTI(为便于描述，称为第二TC-RNTI)，第二TC-RNTI可以不同于第一TC-RNTI，或者说，第二TC-RNTI可以不同于终端设备的C-RNTI。
示例性地，随机接入响应中还可以包括定时提前命令，终端设备接收到随机接入响应后，可以根据定时提前命令更新终端设备的定时提前量，并启动或重启定时器。在定时器 超时之前，更新后的定时提前量有效。同样地，网络设备发送随机响应后，也可以启动或重启定时器。
本申请实施例中，终端设备根据定时提前命令更新终端设备的定时提前量的实现方式可以有多种。在一个示例中，若终端设备支持单个上行载波，则终端设备中可以维护一个定时提前量，接收到定时提前命令后，可以根据定时提前命令更新该定时提前量。
在又一个示例中，若终端设备支持多个上行载波(比如载波聚合场景)，则终端设备中可能维护多个定时提前量。所谓载波聚合是将多个载波单元(component carrier，CC)聚合在一起为一个终端设备服务，载波聚合也可以称为小区的聚合。聚合的多个小区中包含一个主小区(primary component cell，PCell))，还可以包含一个主辅小区(primary secondary cell，PSCell)以及一个或多个辅小区(secondary component cell，SCell)。在载波聚合场景下，当终端设备配置有多个上行载波时，因多个上行载波在网络侧可能不共站，或者不同载波上的波束方向不同等原因，进而导致终端设备在不同上行载波上传输的定时提前量不同，因此可以将不同载波划分为不同的定时提前组(timing adavance group，TAG)，一个TAG内的所有载波可以使用相同的定时提前量。如果一个TAG中包含了PCell或者PSCell，本申请实施例中称这种TAG为主定时提前组(pTAG)，如果一个TAG中不包含PCell或者PSCell，即该TAG中只包含SCell，本申请实施例中称该TAG为辅定时提前组sTAG。由此可以看出，在载波聚合场景中，终端设备可以维护两个定时提前量，分别为pTAG对应的定时提前量和sTAG对应的定时提前量。此种情形下，终端设备接收到定时提前命令后，若确定pTAG对应的定时提前量失效，则可以根据定时提前命令更新pTAG对应的定时提前量；或者，若确定pTAG对应的定时提前量有效，且sTAG对应的定时提前量失效，则可以根据定时提前命令更新sTAG对应的定时提前量。
示例性地，网络设备向终端设备发送随机接入响应之前，可以先发送用于调度随机接入响应的下行控制信息(downlink control information，DCI)，该DCI可以采用随机接入无线网络临时标识(random acess-radio network temporary identifier，RA-RNTI)加扰，该DCI用于指示承载随机接入响应的资源；进而在该DCI指示的资源上发送随机接入响应。相应地，终端设备接收到DCI后，可以在DCI所指示的资源上接收随机接入响应。
步骤3，终端设备可以利用上行授权向网络设备发送请求消息，或者说在上行授权所指示的资源上向网络设备发送请求消息，进而网络设备可以接收来自终端设备的请求消息。
进一步地，还可以包括：步骤4，网络设备向终端设备发送竞争解决消息，进而终端设备接收来自网络设备的竞争解决消息。其中，终端设备若确定竞争解决成功，则可以确定系统信息请求成功，并可以接收系统信息；若确定竞争解决失败，则可以再次请求系统信息。示例性地，终端设备确定竞争解决成功后，可以忽略第二TC-RNTI，此处的“忽略”也可以理解为“丢弃”。
其中，网络设备向终端设备发送竞争解决消息的一种可能的实现方式为，网络设备发送用于调度竞争解决消息的第二DCI，第二DCI可以通过终端设备的C-RNTI或第二TC-RNTI加扰，第二DCI可以用于指示承载竞争解决消息的资源；以及，在第二DCI所指示的资源上发送竞争解决消息。相应地，终端设备接收到第二DCI后，可以根据第二DCI，在第二DCI所指示的资源上接收竞争解决消息。其中，第二DCI具体是通过终端设备的C-RNTI还是第二TC-RNTI加扰，可以由协议约定，或者也可以由网络设备指示给终端设备，具体不做限定。
进一步地，若终端设备的标识承载在MAC CE中，则终端设备接收到C-RNTI或第二TC-RNTI加扰的第二DCI后，可以根据是否能解扰C-RNTI或第二TC-RNTI加扰的第二DCI来确定竞争冲突解决是否成功；若终端设备的标识承载在RRC信令中，则终端设备可以根据接收到C-RNTI或第二TC-RNTI加扰的第二DCI所携带的竞争冲突解决MAC CE与请求消息的前48个比特是否一致来确定竞争解决是否成功。
需要说明的是，上述步骤1和步骤2与图4中所描述的步骤401和步骤402的实现过程可以相同，可以参照步骤401和步骤402。步骤3中所涉及的请求消息与步骤403中的第3消息的区别在于，请求消息中包括终端设备的C-RNTI，除此差异之外的其它内容，可以参照步骤403。步骤4中第二DCI可以通过终端设备的C-RNTI或TC-RNTI(比如可以为第二TC-RNTI)加扰，而步骤404中的用于调度的竞争解决消息的DCI是通过TC-RNTI，除此差异之外的其它内容，可以参照步骤404。
步骤704，网络设备根据终端设备的标识，向终端设备发送请求的系统信息。
相应地，在步骤705中，终端设备接收来自网络设备的系统信息。
本申请实施例中，网络设备根据终端设备的标识，向终端设备发送请求的系统信息的方式可以有多种。在一种可能的实现方式中，网络设备可以发送用于调度系统信息的第一DCI，第一DCI通过终端设备的C-RNTI加扰，第一DCI用于指示承载系统信息的资源；以及，在第一DCI所指示的资源上发送系统信息。相应地，终端设备接收到第一DCI后，可以在第一DCI所指示的资源上接收系统信息。可以理解地，由于第一DCI通过终端设备的C-RNTI加扰，因此该终端设备可以基于C-RNTI通过盲检过程接收到第一DCI，而除该终端设备以外的其它终端设备，由于并不知晓该终端设备的C-RNTI，从而无法接收到第一DCI，进而也无法在第一DCI所指示的资源上接收系统信息，因此，网络设备根据该终端设备的C-RNTI，通过上述方式实现了将系统信息单播给该终端设备。
其中，网络设备可以通过下行控制信道向终端设备发送第一下行控制信息(downlink control information，DCI)。下行控制信道可以为物理下行控制信道(physical downlink control channel，PDCCH)，或者增强的物理下行控制信道(enhanced physical downlink control channel，ePDCCH)，或者是其它可能的下行控制信道，具体不做限制。
示例性地，第一DCI通过C-RNTI加扰，也可以描述为第一DCI使用C-RNTI加扰，或者，第一DCI中的循环冗余校验码(cyclic redundancy check，CRC)校验信息使用C-RNTI加扰。下面将简要描述DCI的编码过程以说明DCI使用C-RNTI加扰的含义。DCI的编码过程包括：步骤1，信息比特按照一定的DCI格式(DCI format)组成信息块，或称为信息序列，如a 0,a 1,a 2,a 3,...,a A-1；步骤2，根据信息块a 0,a 1,a 2,a 3,...,a A-1生成CRC校验信息p 0,p 1,p 2,p 3,...,p L-1，在信息块上附加上CRC校验信息生成b 0,b 1,b 2,b 3,...,b K-1，其中：b k＝a k，for k＝0,1,2,...,A-1；b k＝p k-A，for k＝A,A+1,A+2,...,A+L-1。步骤3，附加后，CRC校验信息可以用C-RNTI(比如x rnti,0,x rnti,1,...,x rnti,15)进行加扰生成信息序列c 0,c 1,c 2,c 3,...,c K-1，比如可以是指进行如下运算：c k＝b k，for k＝0,1,2,…,A+7；c k＝(b k+x rnti,k-A-8)mod 2，for k＝A+8,A+9,A+10,...,A+23。步骤4，进行信道编码和速率匹配，完成编码过程，得到编码后的DCI。可以理解地，前文所述的第二DCI通过终端设备的C-RNTI或第二TC-RNTI加扰也可以参照此处的描述。
采用上述方法，一方面，由于终端设备向网络设备发送的请求消息中包括终端设备的标识，进而网络设备可以根据终端设备的标识，通过单播的方式发送终端设备请求的系统 信息，避免通过广播方式发送系统信息而导致终端设备可能无法接收到系统信息的问题。
另一方面，对于空闲态或非激活态的终端设备，当其通过随机接入过程的第3消息请求系统信息时，在竞争解决成功后，终端设备通常不再维护定时提前量，比如停止定时器。这是由于对于空闲态或非激活态的终端设备来说，其上行数据传输通常是在通过随机接入过程接入网络设备后进行上行数据传输，或者在随机接入过程的第3消息中进行少量的上行数据传输(即在接入网络设备的过程中进行上行数据传输)，而当终端设备不需要进行上行数据传输时，其没有必要获取或维护定时提前量，因此，当终端设备通过随时接入过程请求系统信息时，即便是获取到了提示提前量，也没有必要维护。而本申请实施例中，对于连接态的终端设备，在竞争解决成功后，终端设备可以继续维护定时提前量，即在定时器超时前，定时提前量始终是有效的，从而能够有效避免定时提前量失效而影响上行数据传输。
实施例二
在实施例二中，将基于上述方案二描述通信方法的一种可能的实现。
图9为本申请实施例二提供的通信方法所对应的流程示意图，如图9所示，包括：
步骤901，终端设备与网络设备建立连接。
步骤902，终端设备向网络设备发送请求消息，请求消息用于请求系统信息，请求消息承载在系统信息对应的随机接入资源上。
其中，随机接入资源可以为物理随机接入信道(physical random access channel，PRACH)资源；请求消息可以为随机接入请求，请求消息中可以包括随机接入前导码。示例性地，请求消息可以为基于竞争的随机接入过程中的随机接入请求，或者也可以为基于非竞争的随机接入过程中的随机接入请求。
步骤903，网络设备接收请求消息。
示例性地，网络设备可以在系统消息块一中配置专用于请求系统信息的PRACH资源，如此，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系统信息。其中，网络设备配置了专用于请求系统信息的PRACH资源，可以理解为，网络设备配置了PRACH资源与系统信息之间的映射关系(或对应关系)。进而，终端设备可以根据PRACH资源与系统信息的映射关系，使用请求的系统信息(比如系统信息1)对应的PRACH资源向网络设备发送请求消息，进而网络设备在PRACH资源上接收到请求消息后可以根据PRACH资源与系统信息之间的映射关系发送系统信息1。
举个例子，参见表1所示，为PRACH资源与系统信息之间的映射关系示例。
表1：PRACH资源与系统信息之间的映射关系示例
PRACH资源 系统信息
PRACH资源1 系统信息1
PRACH资源2 系统信息2和系统信息3
根据表1可以看出，PRACH资源1对应于系统信息1，PRACH资源2对应于系统信息2和系统信息3。如果终端设备在发送第1消息时使用的是PRACH资源1，则表明终端设备请求的是系统信息1，而如果终端设备在发送第1消息时使用的是PRACH资源2，则表明终端设备请求的是系统信息2和系统信息3。表1中的系统信息可以包括理解为系统 信息块或系统消息，具体不做限定。
步骤904，网络设备根据请求消息发送响应消息，响应消息可以包括定时提前命令。
步骤905，终端设备接收来自网络设备的响应消息。
此处的响应消息可以理解为随机接入响应。
步骤906，终端设备根据定时提前命令，更新终端设备的定时提前量，启动或重启定时器。在定时器超时之前，更新后的定时提前量有效。
此处，终端设备更新终端设备的定时提前量的具体实现可以参照实施例一中的描述，不再赘述。
步骤907，网络设备发送系统信息。
此处，网络设备可以通过广播的方式来发送系统信息。
步骤908，终端设备接收来自网络设备的系统信息。
示例性地，由于终端设备发送请求消息后，接收到了响应消息，因此可以认为系统信息请求成功，并开始接收系统信息。若终端设备发送请求消息后，在相应的随机接入响应窗内未接收到响应消息，则可以认为系统信息请求失败，此种情形下，终端设备可以重新发起随机接入过程来请求系统信息。
需要说明的是，从网络设备的角度来看，在一个示例中，当网络设备接收到终端设备发送的用于请求系统信息的第1消息后，可以根据第1消息发送响应消息，响应消息中包括定时提前命令，该终端设备可以为连接态的终端设备或者也可以为非激活态或空闲态的终端设备。在又一个示例中，当网络设备接收到终端设备发送的用于请求系统信息的第1消息后，可以判断该终端设备是否为连接态的终端设备，若是连接态的终端设备，则可以根据第1消息发送响应消息，响应消息中包括定时提前命令；若是空闲态或非激活态的终端设备，则可以根据第1消息发送响应消息，响应消息中可以不包括定时提前命令。
采用上述方法，一方面，连接态的终端设备可以通过随机接入过程的第1消息请求系统信息，从而实现了连接态的终端设备获取非必要系统信息。
另一方面，对于空闲态或非激活态的终端设备，当其通过随机接入过程的第1消息请求系统信息时，网络设备发送的随机接入响应中通常只包含随机接入前导码标识，而不包括其它信息，比如不包括定时提前命令。这是由于对于空闲态或非激活态的终端设备来说，其上行数据传输通常是在通过随机接入过程接入网络设备后进行上行数据传输，或者在随机接入过程的第3消息中进行少量的上行数据传输，而当终端设备不需要进行上行数据传输时，其没有必要获取或维护定时提前量，因此，当空闲态或非激活态的终端设备通过随机接入过程的第1消息请求系统信息时，网络设备没有必要对终端设备的定时提前进行估计，进而网络设备发送的随机接入响应中不包括定时提前命令。而本申请实施例中，网络设备接收到请求系统信息的第1消息后，根据第1消息所发送的响应消息中可以包括定时提前命令，从而使得终端设备可以及时更新定时提前量，保证上行数据传输正常。
针对于上述实施例一和实施例二，需要说明的是：
(1)上述图7或图9中所涉及的步骤编号仅为执行流程的一种可能的示例，并不构成对各个步骤的执行先后顺序的限制。本申请实施例中，相互之间没有时序依赖关系的步骤之间没有严格的执行顺序。比如，上述步骤907可以在步骤906之前执行，或者步骤907也可以和步骤906同时执行，具体不做限定。
(2)上述实施例一中描述了连接态的终端设备通过随机接入过程的第3消息请求系统信息的实现，实施例二中描述了连接态的终端设备通过随机接入过程的第1消息请求系统信息的实现。除上文中所描述的差异之外的其它内容，实施例一和实施例二可以相互参照。
上述主要从网络设备和终端设备之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，为了实现上述功能，网络设备或终端设备可以包括执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请的实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对终端设备和网络设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
在采用集成的单元的情况下，图10示出了本申请实施例中所涉及的装置的可能的示例性框图。如图10所示，装置1000可以包括：处理单元1002和通信单元1003。处理单元1002用于对装置1000的动作进行控制管理。通信单元1003用于支持装置1000与其他设备的通信。可选地，通信单元1003也称为收发单元，可以包括接收单元和/或发送单元，分别用于执行接收和发送操作。装置1000还可以包括存储单元1001，用于存储装置1000的程序代码和/或数据。
该装置1000可以为上述任一实施例中的终端设备、或者还可以为设置在终端设备中的芯片。处理单元1002可以支持装置1000执行上文中各方法示例中终端设备的动作。或者，处理单元1002主要执行方法示例中的终端设备的内部动作，通信单元1003可以支持装置1000与网络设备之间的通信。例如，处理单元1002用于执行图9中的步骤906；通信单元1003可以用于执行图7的步骤701、骤702、步骤705，以及图9中的步骤901、步骤902、步骤905、步骤908。
具体地，在一个实施例中，通信单元1003用于：获取终端设备的标识，然后向网络设备发送请求消息，请求消息包括所述终端设备的标识和第一信息，第一信息用于指示所述终端设备请求的系统信息；进而接收来自网络设备的系统信息。
在一种可能的设计中，通信单元1003具体用于：接收来自网络设备的用于调度系统信息的第一下行控制信息，第一下行控制信息通过所述终端设备的标识加扰；进而根据第一下行控制信息，接收来自网络设备的系统信息。
在一种可能的设计中，第一信息包括多个比特，每个比特对应一个系统信息块或者对应一个系统消息，且所述比特的取值用于指示对应的系统信息块或系统消息是否被请求。
在一种可能的设计中，第一信息还包括指示信息，指示信息用于指示所述比特对应的系统信息的粒度。
在一种可能的设计中，第一信息承载在MAC CE中。
在一种可能的设计中，通信单元1003具体用于：向网络设备发送随机接入请求；接收随机接入请求的随机接入响应，随机接入响应包括上行授权；利用上行授权向网络设备 发送请求消息。
在一种可能的设计中，通信单元1003还用于：接收来自网络设备的用于调度竞争解决消息的第二下行控制信息，第二下行控制信息通过终端设备的标识或终端设备的TC-RNTI加扰；根据第二下行控制信息，接收竞争解决消息。
在一种可能的设计中，所述随机接入响应还包括定时提前命令；处理单元1002用于：根据所述定时提前命令，更新所述终端设备的定时提前量，并启动或重启定时器。
在一种可能的设计中，终端设备的标识为终端设备的C-RNTI。
在又一个实施例中，通信单元1003用于：与网络设备建立连接，并向网络设备发送请求消息，请求消息用于请求系统信息，请求消息承载在所述系统信息对应的随机接入资源上；进而接收网络设备根据所述请求消息发送的响应消息，响应消息包括定时提前命令；处理单元1002用于：根据定时提前命令，更新终端设备的定时提前量，启动或重启定时器；通信单元1003还用于：接收网络设备发送的系统信息。
该装置1000还可以为上述任一实施例中的网络设备、或者还可以为设置在网络设备中的芯片。处理单元1002可以支持装置1000执行上文中各方法示例中网络设备的动作。或者，处理单元1002主要执行方法示例中的网络设备的内部动作，通信单元1003可以支持装置1000与终端设备之间的通信。例如，通信单元1003可以用于执行图7的步骤703、骤704，以及图9中的步骤901、步骤903、步骤904、步骤907。
具体地，在一个实施例中，通信单元1003用于：接收来自终端设备的请求消息，所述终端设备处于连接态，所述请求消息包括所述终端设备的标识和第一信息，所述第一信息用于指示所述终端设备请求的系统信息；进而根据所述终端设备的标识，发送所述系统信息。
在一种可能的设计中，通信单元1003具体用于：发送用于调度所述系统信息的第一下行控制信息，所述第一下行控制信息通过所述终端设备的标识加扰；发送所述系统信息。
在一种可能的设计中，第一信息包括多个比特，每个比特对应一个系统信息块或者对应一个系统消息，且所述比特的取值用于指示对应的系统信息块或系统消息是否被请求。
在一种可能的设计中，所述第一信息还包括指示信息，所述指示信息用于指示所述比特对应的系统信息的粒度。
在一种可能的设计中，所述第一信息承载在MAC CE中。
在一种可能的设计中，通信单元1003具体用于：接收来自所述终端设备的随机接入请求；发送所述随机接入请求的随机接入响应，所述随机接入响应包括上行授权；接收所述终端设备利用所述上行授权发送的所述请求消息。
在一种可能的设计中，通信单元1003还用于：发送用于调度竞争解决消息的第二下行控制信息，所述第二下行控制信息通过所述终端设备的标识或所述终端设备的TC-RNTI加扰；发送所述竞争解决消息。
在一种可能的设计中，所述随机接入响应还包括定时提前命令；处理单元1002用于：启动或重启定时器。
在一种可能的设计中，终端设备的标识为所述终端设备的C-RNTI。
在又一个实施例中，通信单元1003用于：与终端设备建立连接，并接收终端设备发送的请求消息，请求消息用于请求系统信息，请求消息承载在所述系统信息对应的随机接入资源上；向终端设备发送响应消息，响应消息包括定时提前命令；以及，发送系统信息。
应理解以上装置中单元的划分仅仅是一种逻辑功能的划分，实际实现时可以全部或部分集成到一个物理实体上，也可以物理上分开。且装置中的单元可以全部以软件通过处理元件调用的形式实现；也可以全部以硬件的形式实现；还可以部分单元以软件通过处理元件调用的形式实现，部分单元以硬件的形式实现。例如，各个单元可以为单独设立的处理元件，也可以集成在装置的某一个芯片中实现，此外，也可以以程序的形式存储于存储器中，由装置的某一个处理元件调用并执行该单元的功能。此外这些单元全部或部分可以集成在一起，也可以独立实现。这里所述的处理元件又可以成为处理器，可以是一种具有信号的处理能力的集成电路。在实现过程中，上述方法的各步骤或以上各个单元可以通过处理器元件中的硬件的集成逻辑电路实现或者以软件通过处理元件调用的形式实现。
在一个例子中，以上任一装置中的单元可以是被配置成实施以上方法的一个或多个集成电路，例如：一个或多个特定集成电路(Application Specific Integrated Circuit，ASIC)，或，一个或多个微处理器(digital singnal processor，DSP)，或，一个或者多个现场可编程门阵列(Field Programmable Gate Array，FPGA)，或这些集成电路形式中至少两种的组合。再如，当装置中的单元可以通过处理元件调度程序的形式实现时，该处理元件可以是处理器，比如通用中央处理器(central processing unit，CPU)，或其它可以调用程序的处理器。再如，这些单元可以集成在一起，以片上系统(system-on-a-chip，SOC)的形式实现。
以上用于接收的单元是一种该装置的接口电路，用于从其它装置接收信号。例如，当该装置以芯片的方式实现时，该接收单元是该芯片用于从其它芯片或装置接收信号的接口电路。以上用于发送的单元是一种该装置的接口电路，用于向其它装置发送信号。例如，当该装置以芯片的方式实现时，该发送单元是该芯片用于向其它芯片或装置发送信号的接口电路。
请参考图11，其为本申请实施例提供的一种终端设备的结构示意图。其可以为以上实施例中的终端设备，用于实现以上实施例中终端设备的操作。如图11所示，该终端设备包括：天线1110、射频部分1120、信号处理部分1130。天线1110与射频部分1120连接。在下行方向上，射频部分1120通过天线1110接收网络设备发送的信息，将网络设备发送的信息发送给信号处理部分1130进行处理。在上行方向上，信号处理部分1130对终端设备的信息进行处理，并发送给射频部分1120，射频部分1120对终端设备的信息进行处理后经过天线1110发送给网络设备。
信号处理部分1130可以包括调制解调子系统，用于实现对数据各通信协议层的处理；还可以包括中央处理子系统，用于实现对终端设备操作系统以及应用层的处理；此外，还可以包括其它子系统，例如多媒体子系统，周边子系统等，其中多媒体子系统用于实现对终端设备相机，屏幕显示等的控制，周边子系统用于实现与其它设备的连接。调制解调子系统可以为单独设置的芯片。
调制解调子系统可以包括一个或多个处理元件1131，例如，包括一个主控CPU和其它集成电路。此外，该调制解调子系统还可以包括存储元件1132和接口电路1133。存储元件1132用于存储数据和程序，但用于执行以上方法中终端设备所执行的方法的程序可能不存储于该存储元件1132中，而是存储于调制解调子系统之外的存储器中，使用时调制解调子系统加载使用。接口电路1133用于与其它子系统通信。
该调制解调子系统可以通过芯片实现，该芯片包括至少一个处理元件和接口电路，其 中处理元件用于执行以上终端设备执行的任一种方法的各个步骤，接口电路用于与其它装置通信。在一种实现中，终端设备实现以上方法中各个步骤的单元可以通过处理元件调度程序的形式实现，例如用于终端设备的装置包括处理元件和存储元件，处理元件调用存储元件存储的程序，以执行以上方法实施例中终端设备执行的方法。存储元件可以为处理元件处于同一芯片上的存储元件，即片内存储元件。
在另一种实现中，用于执行以上方法中终端设备所执行的方法的程序可以在与处理元件处于不同芯片上的存储元件，即片外存储元件。此时，处理元件从片外存储元件调用或加载程序于片内存储元件上，以调用并执行以上方法实施例中终端设备执行的方法。
在又一种实现中，终端设备实现以上方法中各个步骤的单元可以是被配置成一个或多个处理元件，这些处理元件设置于调制解调子系统上，这里的处理元件可以为集成电路，例如：一个或多个ASIC，或，一个或多个DSP，或，一个或者多个FPGA，或者这些类集成电路的组合。这些集成电路可以集成在一起，构成芯片。
终端设备实现以上方法中各个步骤的单元可以集成在一起，以SOC的形式实现，该SOC芯片，用于实现以上方法。该芯片内可以集成至少一个处理元件和存储元件，由处理元件调用存储元件的存储的程序的形式实现以上终端设备执行的方法；或者，该芯片内可以集成至少一个集成电路，用于实现以上终端设备执行的方法；或者，可以结合以上实现方式，部分单元的功能通过处理元件调用程序的形式实现，部分单元的功能通过集成电路的形式实现。
可见，以上用于终端设备的装置可以包括至少一个处理元件和接口电路，其中至少一个处理元件用于执行以上方法实施例所提供的任一种终端设备执行的方法。处理元件可以以第一种方式：即调用存储元件存储的程序的方式执行终端设备执行的部分或全部步骤；也可以以第二种方式：即通过处理器元件中的硬件的集成逻辑电路结合指令的方式执行终端设备执行的部分或全部步骤；当然，也可以结合第一种方式和第二种方式执行终端设备执行的部分或全部步骤。
这里的处理元件同以上描述，可以通过处理器实现，处理元件的功能可以和图10中所描述的处理单元的功能相同。示例性地，处理元件可以是通用处理器，例如CPU，还可以是被配置成实施以上方法的一个或多个集成电路，例如：一个或多个ASIC，或，一个或多个微处理器DSP，或，一个或者多个FPGA等，或这些集成电路形式中至少两种的组合。存储元件可以通过存储器实现，存储元件的功能可以和图12中所描述的存储单元的功能相同。存储元件可以通过存储器实现，存储元件的功能可以和图10中所描述的存储单元的功能相同。存储元件可以是一个存储器，也可以是多个存储器的统称。
图11所示的终端设备能够实现图7或图9所示意的方法实施例中涉及终端设备的各个过程。图11所示的终端设备中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详述描述。
请参考图12，其为本申请实施例提供的一种网络设备的结构示意图。用于实现以上实施例中网络设备的操作。如图12所示，该网络设备包括：天线1201、射频装置1202、基带装置1203。天线1201与射频装置1202连接。在上行方向上，射频装置1202通过天线1201接收终端设备发送的信息，将终端设备发送的信息发送给基带装置1203进行处理。 在下行方向上，基带装置1203对终端设备的信息进行处理，并发送给射频装置1202，射频装置1202对终端设备的信息进行处理后经过天线1201发送给终端设备。
基带装置1203可以包括一个或多个处理元件12031，例如，包括一个主控CPU和其它集成电路。此外，该基带装置1203还可以包括存储元件12032和接口12033，存储元件12032用于存储程序和数据；接口12033用于与射频装置1202交互信息，该接口例如为通用公共无线接口(common public radio interface，CPRI)。以上用于网络设备的装置可以位于基带装置1203，例如，以上用于网络设备的装置可以为基带装置1203上的芯片，该芯片包括至少一个处理元件和接口电路，其中处理元件用于执行以上网络设备执行的任一种方法的各个步骤，接口电路用于与其它装置通信。在一种实现中，网络设备实现以上方法中各个步骤的单元可以通过处理元件调度程序的形式实现，例如用于网络设备的装置包括处理元件和存储元件，处理元件调用存储元件存储的程序，以执行以上方法实施例中网络设备执行的方法。存储元件可以为处理元件处于同一芯片上的存储元件，即片内存储元件，也可以为与处理元件处于不同芯片上的存储元件，即片外存储元件。
在另一种实现中，网络设备实现以上方法中各个步骤的单元可以是被配置成一个或多个处理元件，这些处理元件设置于基带装置上，这里的处理元件可以为集成电路，例如：一个或多个ASIC，或，一个或多个DSP，或，一个或者多个FPGA，或者这些类集成电路的组合。这些集成电路可以集成在一起，构成芯片。
网络设备实现以上方法中各个步骤的单元可以集成在一起，以片上系统(system-on-a-chip，SOC)的形式实现，例如，基带装置包括该SOC芯片，用于实现以上方法。该芯片内可以集成至少一个处理元件和存储元件，由处理元件调用存储元件的存储的程序的形式实现以上网络设备执行的方法；或者，该芯片内可以集成至少一个集成电路，用于实现以上网络设备执行的方法；或者，可以结合以上实现方式，部分单元的功能通过处理元件调用程序的形式实现，部分单元的功能通过集成电路的形式实现。
可见，以上用于网络设备的装置可以包括至少一个处理元件和接口电路，其中至少一个处理元件用于执行以上方法实施例所提供的任一种网络设备执行的方法。处理元件可以以第一种方式：即调用存储元件存储的程序的方式执行网络设备执行的部分或全部步骤；也可以以第二种方式：即通过处理器元件中的硬件的集成逻辑电路结合指令的方式执行网络设备执行的部分或全部步骤；当然，也可以结合第一种方式和第二种方式执行以上网络设备执行的部分或全部步骤。
这里的处理元件同以上描述，可以通过处理器实现，处理元件的功能可以和图10中所描述的处理单元的功能相同。示例性地，处理元件可以是通用处理器，例如CPU，还可以是被配置成实施以上方法的一个或多个集成电路，例如：一个或多个ASIC，或，一个或多个微处理器DSP，或，一个或者多个FPGA等，或这些集成电路形式中至少两种的组合。存储元件可以通过存储器实现，存储元件的功能可以和图12中所描述的存储单元的功能相同。存储元件可以通过存储器实现，存储元件的功能可以和图10中所描述的存储单元的功能相同。存储元件可以是一个存储器，也可以是多个存储器的统称。
图12所示的网络设备能够实现图7或图9所示意的方法实施例中涉及网络设备的各个过程。图12所示的网络设备中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详述描述。
在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
在实现过程中，本实施例提供的方法中的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。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。
应注意，本申请实施例中的存储器或存储单元可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
在上述实施例中，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程序或指令。在计算机上加载和执行所述计算机程序或指令时，全部或部分地执行本申请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、或者其他可编程装置。所述计算机程序或指令可以存储在计算机可读存储介质中，或者通过所述计算机可读存储介质进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是集成一个或多个可用介质的服务器等数据存储设备。所述可用介质可以是磁性介质，例如，软盘、硬盘、磁带；也可以是光介质，例如，DVD；还可以是半导体介质，例如，固态硬盘(solid state disk，SSD)。
本申请实施例中所描述的各种说明性的逻辑单元和电路可以通过通用处理器，数字信号处理器，专用集成电路(ASIC)，现场可编程门阵列(FPGA)或其它可编程逻辑装置，离散门或晶体管逻辑，离散硬件部件，或上述任何组合的设计来实现或操作所描述的功能。通用处理器可以为微处理器，可选地，该通用处理器也可以为任何传统的处理器、控制器、微控制器或状态机。处理器也可以通过计算装置的组合来实现，例如数字信号处理器和微处理器，多个微处理器，一个或多个微处理器联合一个数字信号处理器核，或任何其它类似的配置来实现。
本申请实施例中所描述的方法或算法的步骤可以直接嵌入硬件、处理器执行的软件单元、或者这两者的结合。软件单元可以存储于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、可移动磁盘、CD-ROM或本领域中其它任意形式的存储媒介中。示例性地，存储媒介可以与处理器连接，以使得处理器可以从存储媒介中读取信息，并可以向存储媒介存写信息。可选地，存储媒介还可以集成到处理器中。 处理器和存储媒介可以设置于ASIC中，ASIC可以设置于终端设备中。可选地，处理器和存储媒介也可以设置于终端设备中的不同的部件中。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管结合具体特征对本申请实施例进行了描述，显而易见的，在不脱离本申请实施例的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请实施例的示例性说明，且视为已覆盖本申请实施例范围内的任意和所有修改、变化、组合或等同物。

Claims (29)

  1. 一种通信方法，其特征在于，所述方法包括：
    获取终端设备的标识；
    向网络设备发送请求消息，所述请求消息包括所述终端设备的标识和第一信息，所述第一信息用于指示所述终端设备请求的系统信息；
    接收来自所述网络设备的所述系统信息。
  2. 根据权利要求1所述的方法，其特征在于，接收来自所述网络设备的所述系统信息，包括：
    接收来自所述网络设备的用于调度所述系统信息的第一下行控制信息，所述第一下行控制信息通过所述终端设备的标识加扰；
    根据所述第一下行控制信息，接收来自所述网络设备的所述系统信息。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一信息包括多个比特，每个比特对应一个系统信息块或者对应一个系统消息，且所述比特的取值用于指示对应的系统信息块或系统消息是否被请求。
  4. 根据权利要求3所述的方法，其特征在于，所述第一信息还包括指示信息，所述指示信息用于指示所述比特对应的系统信息的粒度。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第一信息承载在媒体接入控制控制元素MAC CE中。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，向所述网络设备发送请求信息，包括：
    向所述网络设备发送随机接入请求；
    接收所述随机接入请求的随机接入响应，所述随机接入响应包括上行授权；
    利用所述上行授权向所述网络设备发送所述请求消息。
  7. 根据权利要求6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用于调度竞争解决消息的第二下行控制信息，所述第二下行控制信息通过所述终端设备的标识或所述终端设备的临时小区无线网络临时标识TC-RNTI加扰；
    根据所述第二下行控制信息，接收所述竞争解决消息。
  8. 根据权利要求6或7所述的方法，其特征在于，所述随机接入响应还包括定时提前命令；
    所述方法还包括：
    根据所述定时提前命令，更新所述终端设备的定时提前量，并启动或重启定时器。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述终端设备的标识为所述终端设备的小区无线网络临时标识C-RNTI。
  10. 一种通信方法，其特征在于，所述方法包括：
    接收来自终端设备的请求消息，所述终端设备处于连接态，所述请求消息包括所述终端设备的标识和第一信息，所述第一信息用于指示所述终端设备请求的系统信息；
    根据所述终端设备的标识，发送所述系统信息。
  11. 根据权利要求10所述的方法，其特征在于，根据所述终端设备的标识，发送所述 系统信息，包括：
    发送用于调度所述系统信息的第一下行控制信息，所述第一下行控制信息通过所述终端设备的标识加扰；
    发送所述系统信息。
  12. 根据权利要求10或11所述的方法，其特征在于，所述第一信息包括多个比特，每个比特对应一个系统信息块或者对应一个系统消息，且所述比特的取值用于指示对应的系统信息块或系统消息是否被请求。
  13. 根据权利要求12所述的方法，其特征在于，所述第一信息还包括指示信息，所述指示信息用于指示所述比特对应的系统信息的粒度。
  14. 根据权利要求10至13中任一项所述的方法，其特征在于，所述第一信息承载在MAC CE中。
  15. 根据权利要求10至14中任一项所述的方法，其特征在于，接收来自所述终端设备的请求消息，包括：
    接收来自所述终端设备的随机接入请求；
    发送所述随机接入请求的随机接入响应，所述随机接入响应包括上行授权；
    接收所述终端设备利用所述上行授权发送的所述请求消息。
  16. 根据权利要求15所述的方法，其特征在于，所述方法还包括：
    发送用于调度竞争解决消息的第二下行控制信息，所述第二下行控制信息通过所述终端设备的标识或所述终端设备的TC-RNTI加扰；
    发送所述竞争解决消息。
  17. 根据权利要求15或16所述的方法，其特征在于，所述随机接入响应还包括定时提前命令；
    所述方法还包括：启动或重启定时器。
  18. 根据权利要求10至17中任一项所述的方法，其特征在于，所述终端设备的标识为所述终端设备的C-RNTI。
  19. 一种通信方法，其特征在于，所述方法包括：
    与网络设备建立连接；
    向所述网络设备发送请求消息，所述请求消息用于请求系统信息，所述请求消息承载在所述系统信息对应的随机接入资源上；
    接收所述网络设备根据所述请求消息发送的响应消息，所述响应消息包括定时提前命令；
    根据所述定时提前命令，更新终端设备的定时提前量，启动或重启定时器；以及，接收所述网络设备发送的所述系统信息。
  20. 一种通信方法，其特征在于，所述方法包括：
    与终端设备建立连接；
    接收所述终端设备发送的请求消息，所述请求消息用于请求系统信息，所述请求消息承载在所述系统信息对应的随机接入资源上；
    向所述终端设备发送响应消息，所述响应消息包括定时提前命令；
    发送所述系统信息。
  21. 一种装置，其特征在于，包括用于执行如权利要求1至9中任一项所述的方法的 各步骤或者如权利要求19中任一项所述的方法的各步骤的单元。
  22. 一种装置，其特征在于，包括用于执行如权利要求10至18中任一项所述的方法的各步骤或者如权利要求20中任一项所述的方法的各步骤的单元。
  23. 一种装置，其特征在于，包括至少一个处理器和接口电路，其中，所述至少一个处理器用于通过所述接口电路与其它装置通信，并执行如权利要求1至9中任一项所述的方法或者如权利要求19中任一项所述的方法。
  24. 一种装置，其特征在于，包括至少一个处理器和接口电路，其中，所述至少一个处理器用于通过所述接口电路与其它装置通信，并执行如权利要求10至18中任一项所述的方法或者如权利要求20中任一项所述的方法。
  25. 一种装置，其特征在于，包括处理器，用于调用存储器中存储的程序，以执行如权利要求1至9中任一项所述的方法或者如权利要求19中任一项所述的方法。
  26. 一种装置，其特征在于，包括处理器，用于调用存储器中存储的程序，以执行如权利要求10至18中任一项所述的方法或者如权利要求20中任一项所述的方法。
  27. 一种终端设备，其特征在于，包括如权利要求21或权利要求23或权利要求25所述的装置。
  28. 一种网络设备，其特征在于，包括如权利要求22或权利要求24或权利要求26所述的装置。
  29. 一种计算机可读存储介质，其特征在于，包括程序，当所述程序被处理器运行时，如权利要求1至20中任一项所述的方法被执行。
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