WO2018171586A1 - 一种通信方法、终端及网络设备 - Google Patents

一种通信方法、终端及网络设备 Download PDF

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Publication number
WO2018171586A1
WO2018171586A1 PCT/CN2018/079654 CN2018079654W WO2018171586A1 WO 2018171586 A1 WO2018171586 A1 WO 2018171586A1 CN 2018079654 W CN2018079654 W CN 2018079654W WO 2018171586 A1 WO2018171586 A1 WO 2018171586A1
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WIPO (PCT)
Prior art keywords
resource
terminal
signaling
radio interface
interface technology
Prior art date
Application number
PCT/CN2018/079654
Other languages
English (en)
French (fr)
Inventor
刘星
黄曲芳
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18771323.5A priority Critical patent/EP3573402B1/en
Publication of WO2018171586A1 publication Critical patent/WO2018171586A1/zh
Priority to US16/577,974 priority patent/US11044761B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a communication method, a terminal, and a network device.
  • the Random Access Radio Network Tempory Identity is a scheduling identifier used to identify and address the random access response (RAR) sent by the scheduling base station to the terminal.
  • LTE Long Term Evolution
  • PRACH physical random access channel
  • the PDCCH signaling sent by the base station a random access response window corresponding to a physical random access channel (PRACH) resource.
  • PRACH physical random access channel
  • the starting position of the random access response window is the last sent by the preamble sequence.
  • the third subframe after one subframe, the window length is indicated by the base station through system information.
  • the terminal and the base station can determine the RA-RNTI by using formula (1):
  • RA-RNTI 1+t_id+10 ⁇ f_id ⁇ (1)
  • the t_id (0 ⁇ t_id ⁇ 10) is the subframe number of the subframe in which the terminal transmits the PRACH resource of the preamble
  • the f_id is the resource index number of the PRACH resource in the frequency domain in the subframe.
  • f_id is always 0.
  • 0 ⁇ f_id ⁇ 6 In a TDD system, 0 ⁇ f_id ⁇ 6.
  • the terminal can calculate the f_id of the PRACH resource that sends the preamble, and then calculate a unique RA-RNTI according to formula (1), thereby calculating the The RA-RNTI receives PDCCH signaling for scheduling RAR.
  • next-generation wireless communication system for example, in a New Radio (NR) system, the system supports dividing the system bandwidth into multiple sub-bands and/or sub-slots, each sub-band and/or sub-slot can support Different subcarrier spacings, different Transmission Time Intervals (TTIs), etc., and PRACH resources may exist in each subband and/or subslot. If there is one downlink sub-band and/or sub-slot corresponding to more than two uplink sub-bands and/or sub-slots, that is, the terminal transmits the preamble on any of the uplink sub-bands and/or the sub-slots of the PRACH resources.
  • NR New Radio
  • the terminal cannot calculate the t_id and f_id of each PRACH resource. Therefore, when the terminal receives the PDCCH signaling across the sub-band and/or the sub-slot, the t_id and the f_id of the PRACH resource that sends the preamble cannot be estimated, and thus cannot be determined.
  • the RA-RNTI is out, so that the PDCCH signaling for scheduling the RAR cannot be received through the RA-RNTI, so that random access cannot be completed.
  • the present application provides a communication method, a terminal, and a network device, which are used to solve the problem of how a terminal detects and receives PDCCH signaling for scheduling RAR when there are multiple locations of PRACH resources.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the terminal determines the first identifier according to the resource index number of the first resource, where the resource index number of the first resource is preset or indicated by the network device, where the first resource is used to send a preamble of the random access.
  • the first identifier is used to scramble the first signaling, and the first signaling is used to schedule a random access response in the random access procedure;
  • the terminal detects the first signaling according to the first identifier.
  • the terminal determines the first identifier by using a resource index number determination number of the first resource that is preset or indicated by the network device, so as to detect, according to the first identifier, a method for scheduling random access.
  • the first signaling of the random access response so that when there are multiple locations of the first resource, the first signaling is detected and received according to the determined first identifier, thereby solving the problem that there is a plurality of locations in the first resource.
  • how the terminal detects and receives the problem for scheduling the first signaling.
  • the resource index number of the first resource is indicated by the network device, the resource index number of the first resource is determined by the terminal by using the received broadcast information, or the resource of the first resource The index number is determined by the terminal through the received dedicated signaling.
  • the radio interface technology of the first resource is the same as the radio interface technology of the second signaling, where the second signaling is used to trigger the terminal to initiate a random access process;
  • the radio interface technology of the first resource is a radio interface technology indicated by the second signaling, and the second signaling is used to trigger the terminal to initiate a random access process;
  • the radio interface technology of the first resource is a radio interface technology indicated by the handover command received by the terminal, and the handover command is forwarded after the source network device before the terminal handover receives the handover command sent by the network device.
  • the switching command is used to indicate that the terminal is handed over to the network device by the source network device.
  • the radio interface technology of the first resource and the radio interface technology of the second signaling are different radio interface technologies, and if the terminal determines that the radio interface technology indicated by the second signaling includes And at least one resource for transmitting the preamble, selecting one resource from the at least one resource for sending the preamble as the first resource.
  • the terminal detects the first signaling according to the first identifier, including:
  • the terminal detects the first signaling according to the first identifier in a first time length from a second second unit time after the first unit time, where the first time length is P third a sum of lengths of unit time, the first unit time is a unit time at which the preamble transmission ends, the length of the second unit time is a length of a unit time of a radio interface technology of the first resource, or a reference wireless
  • the length of the unit time of the interface technology is the same
  • the length of the third unit time is the same as the length of the unit time of the radio interface technology of the first resource or the length of the unit time of the reference radio interface technology
  • Q is greater than or equal to 0.
  • Positive integer, P is a positive integer greater than or equal to 1; or
  • the terminal determines that the first signaling is not detected within the first time length according to the first identifier, the terminal detects the location according to the first identifier within a second time period starting from the end of the first time length
  • the first signaling, the second time length is a sum of lengths of S fourth unit time, the length of the fourth unit time is the length of the unit time of the radio interface technology of the first resource or reference wireless
  • the interface technology has the same unit time length, and S is a positive integer greater than or equal to 1; or
  • the terminal determines that the first signaling is not detected within the first time length according to the first identifier, the terminal detects the location according to the first identifier within a third time length starting from the end of the first time length
  • the first signaling the third time length is a difference between a sum of lengths of K fifth unit time and a first time length, and a sum of lengths of the K fifth unit times is greater than or equal to the first
  • the length of the fifth unit time is the same as the length of the unit time of the radio interface technology of the first resource or the length of the unit time of the reference radio interface technology
  • K is a positive integer greater than or equal to 1.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the network device indicates, to the terminal, a resource index number of the first resource, where the first resource is a resource for sending a preamble of the random access;
  • the network device receives a preamble sent by the terminal by using the first resource.
  • the network device determines, by using the resource index number of the first resource, the terminal, so that the terminal determines the first identifier according to the resource index number of the first resource, so that the terminal can detect according to the first identifier.
  • the first signaling for scheduling a random access response in the random access procedure thereby solving the problem of how the terminal detects and receives the first signaling when there are multiple locations of the first resource.
  • the network device indicates, to the terminal, a resource index number of the first resource, including:
  • the network device indicates, by using the broadcast information, the resource index number of the first resource to the terminal, or the network device indicates, by using dedicated signaling, the resource index number of the first resource to the terminal.
  • the method further includes:
  • the network device sends a second signaling to the terminal, where the second signaling indicates a radio interface technology of the first resource.
  • the method further includes:
  • the network device sends a handover command to the source network device before the terminal handover, where the handover command indicates a radio interface technology of the first resource.
  • An embodiment of the present application provides a terminal, including:
  • a processing unit configured to determine, according to a resource index number of the first resource, a first identifier, where a resource index number of the first resource is preset or indicated by a network device, where the first resource is used to send random access a resource of the preamble, where the first identifier is used to scramble the first signaling, and the first signaling is used to schedule a random access response in the random access procedure;
  • a transceiver unit configured to detect the first signaling according to the first identifier.
  • the resource index number of the first resource is indicated by the network device, the resource index number of the first resource is determined by using the received broadcast information, or the resource index number of the first resource is Determined by the received proprietary signaling.
  • the radio interface technology of the first resource is the same as the radio interface technology of the second signaling, where the second signaling is used to trigger the terminal to initiate a random access process;
  • the radio interface technology of the first resource is a radio interface technology indicated by the second signaling, and the second signaling is used to trigger the terminal to initiate a random access process;
  • the radio interface technology of the first resource is a radio interface technology indicated by the handover command received by the terminal, and the handover command is forwarded after the source network device before the terminal handover receives the handover command sent by the network device.
  • the switching command is used to indicate that the terminal is handed over to the network device by the source network device.
  • the radio interface technology of the first resource and the radio interface technology of the second signaling are different radio interface technologies, and if the terminal determines that the radio interface technology indicated by the second signaling includes And at least one resource for transmitting the preamble, selecting one resource from the at least one resource for sending the preamble as the first resource.
  • the transceiver unit is specifically configured to:
  • the first time length is P third unit time a sum of lengths
  • the first unit time is a unit time at which the preamble transmission ends
  • the length of the second unit time is longer than a unit time of a radio interface technology of the first resource, or a reference radio interface technology
  • the length of the unit time is the same
  • the length of the third unit time is the same as the length of the unit time of the radio interface technology of the first resource or the length of the unit time of the reference radio interface technology
  • Q is a positive integer greater than or equal to 0.
  • P is a positive integer greater than or equal to 1; or
  • the second time length is a sum of lengths of S fourth unit times, a length of the fourth unit time and a length of a unit time of a radio interface technology of the first resource or a reference radio interface technology
  • S is a positive integer greater than or equal to 1;
  • the third time length is a difference between a sum of lengths of K fifth unit time and a first time length, and a sum of lengths of the K fifth unit times is greater than or equal to the first time length
  • the length of the fifth unit time is the same as the length of the unit time of the radio interface technology of the first resource or the length of the unit time of the reference radio interface technology, and K is a positive integer greater than or equal to 1.
  • the embodiment of the present application provides a network device, including:
  • a processing unit configured to indicate, by the transceiver unit, a resource index number of the first resource, where the first resource is a resource for sending a preamble of the random access;
  • the transceiver unit is configured to receive a preamble sent by the terminal by using the first resource.
  • the transceiver unit is specifically configured to:
  • the transceiver unit is further configured to:
  • the transceiver unit is further configured to:
  • An embodiment of the present application provides a terminal, including:
  • a processor configured to determine, according to a resource index number of the first resource, a first identifier, where a resource index number of the first resource is preset or indicated by a network device, where the first resource is used to send random access a resource of the preamble, where the first identifier is used to scramble the first signaling, and the first signaling is used to schedule a random access response in the random access procedure;
  • a transceiver configured to detect the first signaling according to the first identifier.
  • the resource index number of the first resource is indicated by the network device, the resource index number of the first resource is determined by using the received broadcast information, or the resource index number of the first resource is Determined by the received proprietary signaling.
  • the radio interface technology of the first resource is the same as the radio interface technology of the second signaling, where the second signaling is used to trigger the terminal to initiate a random access process;
  • the radio interface technology of the first resource is a radio interface technology indicated by the second signaling, and the second signaling is used to trigger the terminal to initiate a random access process;
  • the radio interface technology of the first resource is a radio interface technology indicated by the handover command received by the terminal, and the handover command is forwarded after the source network device before the terminal handover receives the handover command sent by the network device.
  • the switching command is used to indicate that the terminal is handed over to the network device by the source network device.
  • the radio interface technology of the first resource and the radio interface technology of the second signaling are different radio interface technologies, and if the terminal determines that the radio interface technology indicated by the second signaling includes And at least one resource for transmitting the preamble, selecting one resource from the at least one resource for sending the preamble as the first resource.
  • the transceiver is specifically configured to:
  • the first time length is P third unit time a sum of lengths
  • the first unit time is a unit time at which the preamble transmission ends
  • the length of the second unit time is longer than a unit time of a radio interface technology of the first resource, or a reference radio interface technology
  • the length of the unit time is the same
  • the length of the third unit time is the same as the length of the unit time of the radio interface technology of the first resource or the length of the unit time of the reference radio interface technology
  • Q is a positive integer greater than or equal to 0.
  • P is a positive integer greater than or equal to 1; or
  • the second time length is a sum of lengths of S fourth unit times, a length of the fourth unit time and a length of a unit time of a radio interface technology of the first resource or a reference radio interface technology
  • S is a positive integer greater than or equal to 1;
  • the third time length is a difference between a sum of lengths of K fifth unit time and a first time length, and a sum of lengths of the K fifth unit times is greater than or equal to the first time length
  • the length of the fifth unit time is the same as the length of the unit time of the radio interface technology of the first resource or the length of the unit time of the reference radio interface technology, and K is a positive integer greater than or equal to 1.
  • the embodiment of the present application provides a network device, including:
  • a BBU configured to indicate, by the RRU, a resource index number of the first resource, where the first resource is a resource for sending a preamble of the random access;
  • the RRU is configured to receive a preamble sent by the terminal by using the first resource.
  • the RRU is specifically configured to:
  • the RRU is further configured to:
  • the RRU is further configured to:
  • the network device provided by the present application may include a module for performing the behavior of the network device in the above method design.
  • the module can be software and/or hardware.
  • the terminal provided by the present application may include a module for performing a terminal behavior in the above method design.
  • the module can be software and/or hardware.
  • Yet another aspect of the present application provides a computer readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform the methods described in the above aspects.
  • Yet another aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.
  • FIG. 1 is a schematic diagram of a system network applicable to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a contention random access procedure in the prior art
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of resource distribution according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a RAR window according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a RAR window according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • Wideband Code Division Multiple Access Wideband Code Division Multiple Access
  • Code Division Multiple Access WCDMA
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • eLTE evolved Long Term Evolution
  • FIG. 1 shows a schematic diagram of a system network suitable for use in an embodiment of the present application.
  • at least one terminal 10 communicates with a radio access network (RAN).
  • the RAN comprises at least one network device 20, of which only one network device 20 and one terminal 10 are shown for clarity.
  • the RAN is connected to a core network (CN).
  • the CN may be coupled to one or more external networks, such as the Internet, a public switched telephone network (PSTN), and the like.
  • PSTN public switched telephone network
  • a terminal which may also be called a user equipment (User Equipment, UE), is a device having a communication function, and can provide voice and/or data services to users, and can include a handheld device with an wireless communication function and an in-vehicle device. , wearables, computing devices, or other processing devices connected to a wireless modem. Terminals can be called different names in different networks, such as: user equipment, mobile stations, subscriber units, stations, cellular phones, personal digital assistants, wireless modems, wireless communication devices, handheld devices, laptops, cordless phones, Wireless local loop station, etc. For convenience of description, the present application is simply referred to as a terminal.
  • a network device which may be a base station (BS), a wireless access device in a cloud network, or a relay station, and has a wireless transceiver function, and is deployed in a wireless access network to provide wireless communication functions. device of.
  • the name of the base station may be different in different wireless access systems, for example, in a Universal Mobile Telecommunications System (UMTS) network, the base station is called a Node B (NodeB), in the LTE network.
  • the base station is called an evolved Node B (abbreviated as eNB or eNodeB), and may be referred to as a Transmission Reception Point (TRP) network node or a g-Node B (gNB) in a future 5G system.
  • TRP Transmission Reception Point
  • Radio Interface Technology may also be called numerology or Long Term Evolution (LTE) technology
  • the radio interface technology may include one or more of the following: subcarrier spacing, cyclic prefix length, Multiple access mode, Modulation and Coding Scheme (MCS), frame structure, physical channel, transport channel, logical channel (Logical Channel, LCH) ), Medium Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), Radio Resource Control (RRC). Primary Synchronization Channel (P-SCH), Secondary Synchronization Channel (S-SCH), and the like.
  • MCS Modulation and Coding Scheme
  • Different wireless interface technologies can meet the different bandwidth and delay requirements of different services.
  • Different wireless interface technologies can be configured to the same terminal by frequency division or time division.
  • Different physical random access channel PRACH resources may exist on different radio interface technologies.
  • FIG. 1 there are two types of numerology in a frequency division manner in a cell.
  • the transmission time interval (TTI) of the numerology 1 is longer than the TTI of the numerology 2 , and the long period PRACH resource exists on the numerology 1 , and the numerology 2 There is a short period of PRACH resources.
  • FIG. 2 it is a schematic diagram of a contention random access procedure in the prior art.
  • S201 The terminal sends a random access preamble (preamble) to the network device, where the preamble is sent on a physical random access channel (Physical Random Access Channel, PRACH) resource.
  • This message can also be called message 1 (Message1, Msg1).
  • S202 The network device returns a random access response (RAR) message to the terminal.
  • RAR random access response
  • This message can also be referred to as Message 2 (Msg2).
  • the first PDCCH signaling in the PDCCH is monitored and detected in the RAR window, and the first PDCCH signaling is scrambled by the RA-RNTI, and is used to schedule the RAR message sent to the terminal. If the terminal determines the t_id and f_id of the PRACH resource that sends the preamble, the RA-RNTI may be determined according to formula (1), so that the first PDCCH signaling is detected according to the RA-RNTI, thereby receiving the RAR message.
  • S203 The terminal sends a message 3 (Msg3) to the network device.
  • the network device sends a contention resolution message to the terminal, and the message may also be referred to as message 4 (Msg4).
  • Msg4 message 4
  • FIG. 3 is a flowchart of a communication method according to an embodiment of the present application.
  • the method includes:
  • Step 301 The network device indicates, to the terminal, a resource index number of the first resource, where the first resource is a resource used to send a preamble of the random access.
  • the resource index number of the first resource is used to generate a first identifier that scrambles the first signaling.
  • the contents of the first signaling and the first identification are described in detail later.
  • the first resource may refer to a PRACH resource, or other resources used to send a preamble.
  • Step 302 The network device receives a preamble sent by the terminal by using the first resource.
  • Step 303 The terminal determines, according to the resource index number of the first resource, the first identifier, where the resource index number of the first resource is preset or indicated by the network device, where the first resource is used to send random access.
  • the resource of the preamble, the first identifier is used to scramble the first signaling, and the first signaling is used to schedule a random access response in the random access procedure.
  • the first identifier may refer to the RA-RNTI determined by the formula (1) or the identifier similar to the RA-RNTI.
  • the first signaling may be PDCCH signaling for scheduling RAR sent by the network device after receiving the preamble sent by the terminal in the random access procedure, or signaling similar to the PDCCH signaling.
  • Step 304 The terminal detects the first signaling according to the first identifier.
  • the network device may indicate the resource index number of the first resource to the terminal in multiple manners.
  • the network device may indicate, by using the broadcast information, the resource index number of the first resource to the terminal.
  • the network device may indicate, by using dedicated signaling, the resource index number of the first resource to the terminal.
  • the dedicated signaling may refer to signaling such as Radio Resource Control (RRC).
  • RRC Radio Resource Control
  • the network device may indicate, by using a combination of the high layer signaling and the underlying signaling, the resource index number of the first resource to the terminal.
  • the network device may indicate multiple resource index numbers through RRC signaling, and indicate, by using a Media Access Control (MAC) control element (CE) or PDCCH signaling, that the terminal uses one of the types.
  • the resource index number is used to implement the flexible modification of the resource index number of the first resource by the network device.
  • the network device may indicate, by using physical layer signaling, a resource index number of the first resource to the terminal.
  • the physical layer signaling may refer to PDCCH signaling.
  • the network device may further indicate to the terminal a radio interface technology that transmits the first resource of the preamble.
  • the network device may send the second signaling to the terminal, where the second signaling indicates the wireless interface technology of the first resource.
  • the second signaling is used to trigger the terminal to initiate a random access procedure.
  • the second signaling may be a PDCCH signaling that is sent by the network device to the terminal to trigger the terminal to initiate a random access procedure, or a signaling similar to the PDCCH signaling.
  • the network device if the terminal switches from the source network device to the network device, the network device is the destination network device that the terminal needs to switch, and the network device can send the switch to the source network device.
  • the command, the handover command indicates a radio interface technology of the first resource.
  • the source network device After receiving the handover command sent by the network device, the source network device forwards the handover command to the terminal, thereby implementing a radio interface technology for indicating to the terminal the first resource for transmitting the preamble.
  • the network device may determine the first identifier according to the resource index number of the first resource that the terminal sends the preamble, and then send the RAR message to the terminal, where the RAR message is adopted by using the A first signalling that identifies the scrambling is scheduled.
  • the terminal After the terminal first descrambles the first signaling by using the first identifier, the terminal can receive the RAR message according to the scheduling indication of the first signaling.
  • the resource index number can uniquely indicate the time-frequency location of a resource.
  • the implementation manner of the resource index number in the embodiment of the present application is not limited. For details, refer to the provisions in the system such as the LTE system, and details are not described herein. .
  • the terminal may first send the preamble to the network device by using the first resource. Before sending the preamble, the terminal may first determine the radio interface technology for sending the first resource. In this embodiment of the present application, the terminal may determine a radio interface technology for sending the first resource in multiple manners. In a first possible implementation manner, before transmitting the preamble, the terminal may receive the second signaling sent by the network device to trigger the terminal to initiate a random access procedure, where the terminal may determine the second signaling. Wireless interface technology. The terminal directly determines the radio interface technology of the second signaling as the radio interface technology of the first resource, that is, in the implementation manner, the radio interface technology of the first resource is the same as the radio interface technology of the second signaling.
  • the terminal determines the radio interface technology indicated by the second signaling as The radio interface technology of the first resource, that is, in the implementation manner, the radio interface technology of the first resource is a radio interface technology indicated by the second signaling.
  • the radio interface technology indicated by the second signaling may be a radio interface technology indicated by the PDCCH signaling, or may be a reference radio interface technology, or may be another radio interface technology, and may be determined according to actual conditions. This will not be repeated here.
  • the reference radio interface technology may refer to a radio interface technology of a primary synchronization channel or a secondary synchronization signal, or a reference radio interface technology of a certain frequency interval specified by a protocol.
  • the terminal determines the radio interface technology indicated by the second signaling And including at least one resource for sending the preamble, and selecting one resource from the at least one resource for sending the preamble as the first resource. It should be noted that the terminal may randomly select one resource as the first resource for sending the preamble, or may select the first resource according to other manners. Optionally, the terminal may not always select the first resource of the at least one resource for sending the preamble as the first resource that sends the preamble.
  • FIG. 4 it is a schematic diagram of resource distribution provided by an embodiment of the present application.
  • the TTI length of the radio interface technology 1 is T1
  • the TTI length of the radio interface technology 2 is T2
  • the length of T1 is 3 times that of T1.
  • the terminal receives the second signaling in the radio interface technology 1, and the second signaling indicates that the terminal selects the first resource to send the preamble in the radio interface technology 2. Since the radio interface technology 2 has multiple first resources, the terminal A first resource may be randomly selected as a resource for transmitting the preamble.
  • the preamble sequence may be sent to the network device.
  • the network device sends a handover command to the source network device, where the handover command is used to indicate that the terminal is handed over to the network device by the source network device.
  • the network device may indicate the radio interface technology of the first resource to the terminal by using the handover command.
  • the source network device forwards the handover command to the terminal, and the terminal determines the radio interface technology of the first resource.
  • the first identifier may be determined according to the resource index number of the first resource that sends the preamble.
  • the resource index number of the first resource may be preset, or may be indicated by the network device to the terminal, or may be determined by the terminal according to the distribution rule of the first resource.
  • the terminal may directly determine the first identifier according to the preset resource index number.
  • the terminal may send the preamble in the first resource of the reference radio interface technology, or may transmit the preamble in the first resource of any radio interface technology.
  • the terminal may determine the resource index number of the first resource by using the received dedicated signaling that is received by the broadcast information, thereby determining the first identifier. .
  • the terminal may send the preamble in the first resource of the reference radio interface technology, or may transmit the preamble in the first resource of any radio interface technology.
  • the terminal does not need to know how many kinds of first resources are shared, and the terminal only needs to determine the resource index number of the first resource through the indication of the network device.
  • the terminal may determine the resource index number of the first resource according to the order of the first resource in the frequency domain.
  • the order of the first resource in the frequency domain is to sequentially allocate the resource index number according to the frequency ascending or descending order, and the terminal may estimate the resource index number of the first resource according to the frequency of the first resource.
  • the order of the first resources in the frequency domain may be specified by a protocol, or may be indicated by the base station to the terminal by using broadcast information or proprietary signaling.
  • the terminal may determine the first identifier according to the preset resource index number of the first resource or the resource index number of the first resource indicated by the network device, so that the first resource may be used.
  • the first signaling is detected and received according to the determined first identity.
  • the terminal may detect the first signaling in the RAR window according to the first identifier.
  • the starting position and the duration of the RAR window may be implemented in multiple manners, which are separately described below.
  • the starting position of the RAR window may be the starting time of the Qth second unit time after the first unit time, and the duration of the RAR window may be the first time length.
  • the first time length is a sum of lengths of P third unit time
  • the first unit time is a unit time of the end of the preamble transmission
  • the length of the second unit time is the first
  • the length of the unit time of the radio interface technology of the resource or the length of the unit time of the reference radio interface technology is the same
  • the length of the third unit time and the length of the unit time of the radio interface technology of the first resource or the reference radio interface technology The unit time is the same length
  • Q is a positive integer greater than or equal to
  • P is a positive integer greater than or equal to 1.
  • the unit time may be a time interval of a transport block (TB), for example, a time length such as a TTI (Transmission Time Interval).
  • TB transport block
  • the unit time can also be a subframe, or a time interval between two PDCCH monitoring ooccasion.
  • the duration of the RAR window may be calculated based on the length of the unit time of the reference radio interface technology, or may be based on the unit time of the radio interface technology of the first resource transmitting the preamble.
  • the length is calculated based on the basis.
  • the starting position of the RAR window may be calculated based on the length of the unit time of the reference radio interface technology, or may be calculated based on the length of the unit time of the radio interface technology of the first resource transmitting the preamble.
  • the terminal may detect the first signaling according to the first identifier within a first time length from the second second unit time after the first unit time.
  • the specific value of the Q and the P may be pre-agreed by the terminal and the network device, or may be determined by the protocol, and is determined according to the actual situation, which is not limited by the embodiment of the present application.
  • the starting position of the RAR window may be the starting time of the Qth second unit time after the first unit time
  • the duration of the RAR window may include the first time length and the second time length.
  • the second time length is a sum of lengths of S fourth unit time, a length of the fourth unit time and a length of a unit time of a radio interface technology of the first resource or a unit of a reference radio interface technology.
  • the length of time is the same, and S is a positive integer greater than or equal to 1.
  • the terminal determines that the first signaling is not detected within the first time length according to the first identifier, the terminal according to the second time length starting from the end of the first time length
  • the first identifier detects the first signaling. Specifically, the terminal may detect the first signaling according to the first identifier in the radio resource of the radio interface technology of the first resource that sends the preamble, if the first signaling is not detected. In the first signaling, the first signaling is detected according to the first identifier in a radio resource of a reference radio interface technology in a second time length.
  • the terminal may also detect the first signaling in a radio resource of a reference radio interface technology, and if the first signaling is not detected, within a second time length, The first signaling is detected in a radio resource of a radio interface technology that transmits a first resource of a preamble.
  • the radio resource may refer to a PDCCH channel or other time-frequency resources, and is not limited herein.
  • the specific value of the S may be pre-agreed by the terminal and the network device, or may be specified by the protocol, and is determined according to the actual situation.
  • the radio interface technology 1 is a reference radio interface technology
  • the radio interface technology 2 is a radio interface technology for transmitting a first resource of a preamble.
  • the length of the unit time of the radio interface technology 1 is the length of the unit time of the radio interface technology 2. 3 times.
  • the RAR window includes a first time length T1 and a second time length T2, where T1 includes the sum of the lengths of the unit time in the six radio interface technologies 2, and T2 includes the sum of the lengths of the unit time in the three radio interface technologies 1.
  • the terminal may detect the first signaling according to the first identifier in the radio resource of the radio interface technology 2, and if the first signaling is not detected, the radio resource in the radio interface technology 1 in T2 The first signaling is detected according to the first identifier.
  • the starting position of the RAR window may be the starting time of the Qth second unit time after the first unit time
  • the duration of the RAR window may include the first time length and the third time length.
  • the third time length is a difference between the sum of the lengths of the K fifth unit times and the first time length
  • the length of the fifth unit time is the unit time of the wireless interface technology of the first resource.
  • the length or unit time of the reference radio interface technology is the same, and K is a positive integer greater than or equal to 1.
  • the sum of the lengths of the K fifth unit times may be greater than the first time length, and when the sum of the lengths of the K fifth unit times is less than or equal to the first time length, the third time The length is 0.
  • the terminal determines that the first signaling is not detected within the first time length, the terminal detects the location according to the first identifier within a third time length starting from the end of the first time length
  • the first signaling is described. Specifically, the terminal may detect the first signaling according to the first identifier in the radio resource of the radio interface technology of the first resource that sends the preamble, if the first signaling is not detected. In the first signaling, the first signaling is detected according to the first identifier in a radio resource of a reference radio interface technology in a third time length.
  • the terminal may also detect the first signaling in a radio resource of a reference radio interface technology, and if the first signaling is not detected, within a third time length, The first signaling is detected in a radio resource of a radio interface technology that transmits a first resource of a preamble. It should be noted that, when the third time length is 0, the terminal detects the first signaling only for the first time length.
  • the specific value of the K may be pre-agreed by the terminal and the network device, or may be specified by the protocol, and is determined according to the actual situation, which is not limited by the embodiment of the present application.
  • FIG. 6 a schematic diagram of a RAR window provided by an embodiment of the present application.
  • the radio interface technology 1 is a reference radio interface technology
  • the radio interface technology 2 is a radio interface technology for transmitting a first resource of a preamble.
  • the length of the radio interface technology 1 per unit time is the length of the radio interface technology 2 per unit time. 3 times.
  • the RAR window includes a first time length T1 and a third time length T2, where T1 includes a sum of lengths of unit time in six radio interface technologies 2, T2 is a difference between T3 and T1, and T3 is three radio interface technologies. The sum of the lengths of the unit time.
  • the terminal may detect the first signaling according to the first identifier in the radio resource of the radio interface technology 2, and if the first signaling is not detected, the radio resource in the radio interface technology 1 in T2 The first signaling is detected according to the first identifier.
  • T2 is the difference between the sum of the lengths of unit time in one radio interface technology 1 and T1
  • T2 is 0 at this time.
  • the terminal when the terminal does not detect the first signaling in the first time period, the terminal may continue to detect the first signaling in the second time period or the third time period, if the second time period or the third time period is detected.
  • the number of times of re-initiating the random access procedure can be reduced, thereby improving the access speed of the terminal and reducing the access delay of the terminal.
  • one subframe may include multiple unit time, and each unit time has a first resource for transmitting a preamble, one subframe may include multiple first resources, so The first method is calculated using a new method.
  • the first identifier may be calculated by using formula (2):
  • RA-RNTI 1+slot_id+(1+max_slot_id) ⁇ f_id ⁇ (2)
  • the RA-RNTI is the first identifier
  • the slot_id is the index of the first resource
  • the index value is the number of the first resource, which is used to distinguish the first resource in the time domain.
  • a first resource may be used as the starting first resource, and the index value of the starting first resource is set to 0, and then the first resource behind the starting first resource is sequentially performed in chronological order.
  • Take the value until the maximum value max_slot_id is taken, and then repeat it in turn.
  • max_slot_id is related to the starting position of the RAR window and the duration of the RAR window, and max_slot_id+1 may be greater than or equal to the maximum value of the number of first resources that may be included in the time domain within the target time period.
  • the target time period refers to a time period from the time when the terminal transmits the preamble to the time when the RAR window ends.
  • the terminal includes 10 unit time lengths from the time when the preamble is transmitted and the time when the RAR window ends, and each unit time length may include at most one PRACH resource, then the max_slot_id The value can be 9.
  • Max_slot_id can also be the maximum number of first resources in the system domain in the time domain.
  • the first identifier may also be calculated by using formula (3):
  • RA-RNTI 1+t_id+slot_id ⁇ max_t_id+(1+max_slot_id ⁇ max_t_id) ⁇ f_id ⁇ (3)
  • the slot_id is an index value of the first resource in one subframe, and is used to distinguish different first resources in the time domain in one subframe. For the first resource in any one of the subframes, the index value of the first first resource is set to 0, the index value is sequentially set to the first resource behind the first resource, and the set index value is incremented by 1 each time. Until the last first resource in the sub-frame.
  • Max_slot_id is the maximum number of the first resources in the time domain within a subframe. For example, if there is one field in a sub-frame, there are five different first resources in the time domain, and in another There are 7 different first resources in the time domain on the numerology, then the max_slot_id is 7.
  • Max_t_id is the number of subframes in a system frame. In the prior art, max_t_id is 10.
  • SPS semi-persistent scheduling
  • the HARQ Process ID down can be determined by formula (4):
  • HARQ Process ID down [floor(CURRENT_TTI/semiPersistSchedIntervalDL)]modulo numberOfConfSPS-Processes ⁇ (4)
  • CURRENT_TTI [(SFN ⁇ 10)+SN]
  • SFN is the system frame number
  • SN is the number of subframes
  • semiPersistSchedIntervalDL is the period of the downlink SPS resources
  • numberOfConfSPS_Processes is the maximum number of downlink HARQ processes
  • floor() indicates the downward value.
  • modulo is the remainder operator.
  • the HARQ Process ID up can be determined by formula (5):
  • HARQ Process ID up [floor(CURRENT_TTI/semiPersistSchedIntervalUL)]modulo numberOfConfUlSPS_Processes ⁇ (5)
  • CURRENT_TTI [(SFN ⁇ 10)+SN]
  • SFN is the system frame number
  • SN is the number of subframes
  • semiPersistSchedIntervalUL is the period of the uplink SPS resource
  • numberOfConfUlSPS_Processes is the maximum number of uplink HARQ processes
  • floor() indicates the downward value.
  • modulo is the remainder operator.
  • different SPS resources may be configured on different numerologies. It can be seen that when there are multiple SPS resources in a cell, the above formula may calculate the same HARQ process ID.
  • the different HARS process numbers calculated by different SPS resources may cause the HARQ retransmission to fail to correspond to the initial transmission.
  • the radio interface technology index number or the SPS configuration index number may be added as a new parameter, which are respectively described below:
  • the HARQ Process ID can be calculated by equation (6):
  • HARQ Process ID [floor(CURRENT_TTI/semiPersistSchedIntervalDL)]modulo numberOfConfSPS_Processes_1 ⁇ (6)
  • HARQ Process ID numberOfConfSPS_Processes_1 + [floor(CURRENT_TTI/semiPersistSchedIntervalDL)] modulo numberOfConfSPS_Processes_2 ⁇ (7)
  • the HARQ Process ID can be calculated by equation (8):
  • HARQ Process ID numberOfConfSPS_Processes_1+numberOfConfSPS_Processes_2+[floor(CURRENT_TTI/semiPersistSchedIntervalDL)]modulo numberOfConfSPS-Processes-3 ⁇ (8)
  • numberOfConfSPS_Processes_1, numberOfConfSPS_Processes_2, and numberOfConfSPS_Processes_3 refer to the maximum number of HARQ processes allowed in each downlink SPS configuration.
  • the HARQ Process ID can be calculated by equation (9):
  • HARQ Process ID [floor(CURRENT_TTI/semiPersistSchedIntervalUL)]modulo numberOfConfUlSPS_Processes_1 ⁇ (9)
  • HARQ Process ID numberOfConfSPS_Processes_1 + [floor(CURRENT_TTI/semiPersistSchedIntervalUL)] modulo numberOfConfUlSPS_Processes_2 ⁇ (10)
  • numberOfConfUlSPS_Processes_1, numberOfConfUlSPS_Processes_2, numberOfConfUlSPS_Processes_3 refer to the maximum number of HARQ processes allowed in each uplink SPS configuration.
  • the embodiment of the present application further provides a terminal, where the terminal can perform the method flow described in FIG.
  • FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • the terminal 700 includes a processor 701, a transceiver 702, an antenna 703, a memory 704, and an input/output device 705.
  • the processor 701 is mainly used for processing communication protocols and communication data, and controlling the entire terminal, executing software programs, and processing data of the software programs.
  • the memory 704 is primarily used to store software programs and data, such as the codebooks described in the above embodiments.
  • the transceiver 702 is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals.
  • the antenna 703 is mainly used for transmitting and receiving radio frequency signals in the form of electromagnetic waves.
  • the input/output device 705, such as a touch screen, a display screen or a keyboard, is mainly used for receiving data input by a user and outputting data to the user.
  • the processor 701 can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor 701 performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal, and then sends the radio frequency signal to the outside through the antenna in the form of electromagnetic waves.
  • the radio frequency circuit in the transceiver 702 receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 701, and the processor 701 converts the baseband signal into data. And process the data.
  • FIG. 7 shows only one memory and processor for ease of illustration. In an actual terminal, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, and the like.
  • the processor may include a baseband processor and a central processing unit, and the baseband processor is mainly used to process communication protocols and communication data, and the central processing unit is mainly used to control the entire terminal and execute the software.
  • the processor in FIG. 7 integrates the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit can also be independent processors and interconnected by technologies such as a bus.
  • the terminal may include multiple baseband processors to accommodate different network standards.
  • the terminal may include multiple central processors to enhance its processing capabilities, and various components of the terminal may be connected through various buses.
  • the baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the functions of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.
  • the antenna and transceiver having the transceiving function can be regarded as the transceiving unit 802 of the terminal 700, and the processor having the processing function is regarded as the processing unit 801 of the terminal 700.
  • the terminal 800 includes a transceiver unit 802 and a processing unit 801.
  • the transceiver unit 802 can also be referred to as a transceiver, a transceiver, a transceiver, or the like.
  • the device for implementing the receiving function in the transceiver unit 802 can be regarded as a receiving unit, and the device for implementing the sending function in the transceiver unit 802 is regarded as a sending unit, that is, the transceiver unit 802 includes a receiving unit and a sending unit.
  • the receiving unit may also be referred to as a receiver, a receiver or a receiving circuit, etc.
  • the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit.
  • the foregoing terminal may be used to implement the method in the foregoing method embodiment, specifically:
  • a processor configured to determine, according to a resource index number of the first resource, a first identifier, where a resource index number of the first resource is preset or indicated by a network device, where the first resource is used to send random access a resource of the preamble, where the first identifier is used to scramble the first signaling, and the first signaling is used to schedule a random access response in the random access procedure;
  • a transceiver configured to detect the first signaling according to the first identifier.
  • the embodiment of the present application further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments.
  • the method, the steps, the technical details, the technical effects and the like of the foregoing method embodiments are also applicable to the device embodiments, and will not be described in detail later.
  • the embodiment of the present application further provides a network device, where the network device can perform the method flow described in FIG.
  • FIG. 9 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 9 shows a schematic structural diagram of a network device that can be applied to the system shown in FIG. 1.
  • Network device 900 includes one or more remote radio units (RRUs) 901 and one or more baseband units (BBUs) 902.
  • the RRU 901 may be referred to as a transceiver unit, a transceiver, a transceiver circuit or a transceiver, etc., which may include at least one antenna 9011 and a radio frequency unit 9012.
  • the RRU 901 is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals, for example, for transmitting signaling indications or reference signals in the foregoing embodiments to a terminal.
  • the BBU 902 part is mainly used for baseband processing, network device control, and the like.
  • the RRU 901 and the BBU 902 may be physically disposed together or physically separated, that is, distributed base stations.
  • the BBU 902 is a control center of a network device, and may also be referred to as a processing unit, and is mainly used to perform baseband processing functions such as channel coding, multiplexing, modulation, and spreading.
  • the BBU 902 may be composed of one or more boards, and multiple boards may jointly support a single access standard radio access network (such as a 5G network), or may separately support wireless access of different access systems. network.
  • the BBU 902 also includes a memory 9021 and a processor 9022.
  • the memory 9021 is used to store necessary instructions and data.
  • the processor 9022 is configured to control the network device to perform necessary actions.
  • Memory 9021 and processor 9022 can serve one or more boards. That is, the memory and processor can be individually set on each board. It is also possible that multiple boards share the same memory and processor. In addition, the necessary circuits are also provided on each board.
  • the antenna and transceiver having the transceiving function can be regarded as the transceiving unit of the network device 900, and the processor having the processing function is regarded as the processing unit of the network device 900.
  • the network device 1000 includes a transceiver unit 1001 and a processing unit 1002.
  • the transceiver unit 1001 may also be referred to as a transceiver, a transceiver, a transceiver, or the like.
  • the device for implementing the receiving function in the transceiver unit 1001 can be regarded as a receiving unit, and the device for implementing the sending function in the transceiver unit 1001 is regarded as a sending unit, that is, the transceiver unit 1001 includes a receiving unit and a sending unit.
  • the receiving unit may also be referred to as a receiver, a receiver or a receiving circuit, etc.
  • the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit.
  • the foregoing network device may be used to implement the method in the foregoing method embodiment, specifically:
  • the BBU 902 is configured to indicate, by using the RRU 901, a resource index number of the first resource, where the first resource is a resource used to send a preamble of the random access;
  • the RRU 901 is configured to receive a preamble sent by the terminal by using the first resource.
  • the embodiment of the present application further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments.
  • the method, the steps, the technical details, the technical effects and the like of the foregoing method embodiments are also applicable to the device embodiments, and will not be described in detail later.
  • the embodiment of the present application further provides a computer readable storage medium for storing computer software instructions required to execute the foregoing processor, which includes a program for executing the above-mentioned processor.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

Abstract

一种通信方法、终端及网络设备，其中，方法包括：终端根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为所述终端发送随机接入的前导码所使用的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应；所述终端根据所述第一标识检测所述第一信令。

Description

一种通信方法、终端及网络设备
本申请要求在2017年3月20日提交国家专利局、申请号为201710167011.2、发明名称为“一种通信方法、终端及网络设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法、终端及网络设备。
背景技术
随机接入无线网络临时识别号(Random Access Radio Network Tempory Identity，RA-RNTI)是一种调度标识，用于标识和寻址调度基站向终端发送的的随机接入响应(Random Access Response，RAR)的物理下行控制信道(Physical Downlink Control Channel，PDCCH)信令(order)。在长期演进(Long Term Evolution，LTE)系统中，终端在物理随机接入信道(Physical Random Access Channel，PRACH)资源上向基站发送前导序列(preamble)后，需要在随机接入响应窗口内盲检基站发送的PDCCH信令，一个随机接入响应窗口对应一个物理随机接入信道(Physical Random Access Channel，PRACH)资源，现有技术中，随机接入响应窗口的起始位置是前导序列发送的最后一个子帧之后的第三个子帧，窗口长度由基站通过系统信息指示。
现有技术中，终端和基站可以通过公式(1)确定RA-RNTI：
RA-RNTI＝1+t_id+10×f_id······(1)
其中，t_id(0≤t_id<10)是终端发送preamble的PRACH资源所在的子帧(subframe)的子帧号，f_id是在这个子帧内这一个PRACH资源在频域上的资源索引号。在FDD系统中，每个子帧只有一个频域资源用来发送preamble，因此f_id永远为0，在TDD系统中，0≤f_id<6。由上述公式可以看出，终端在一个PRACH资源上发送preamble后，可以推算出发送preamble的PRACH资源的f_id，然后就可以根据公式(1)计算出一个唯一的RA-RNTI，从而根据计算出的RA-RNTI接收用于调度RAR的PDCCH信令。
在下一代无线通信系统中，例如：在新无线(New Radio，NR)系统中，系统支持将系统带宽划分为多个子频带和/或子时隙，每个子频带和/或子时隙可以支持不同的子载波间隔、不同的传输时间间隔(Transmission Time Interval，TTI)等，同时每个子频带和/或子时隙中都可能存在PRACH资源。如果存在一个下行子频带和/或子时隙对应两个以上的上行子频带和/或子时隙，也就是终端无论在哪一个上行子频带和/或子时隙的PRACH资源上发送preamble，都在对应的这一个下行子频带和/或子时隙上去接收PDCCH信令。此时，终端无法推算出每个PRACH资源的t_id和f_id，因此当终端跨子频带和/或子时隙接收PDCCH信令时，无法推算出发送preamble的PRACH资源的t_id和f_id，从而无法确定出RA-RNTI，从而无法通过RA-RNTI接收到用于调度RAR的PDCCH信令，从而无法完成随机接入。
目前，如何解决在PRACH资源的位置存在多个时，终端如何检测并接收用于调度RAR 的PDCCH信令，目前来说还是一个亟待解决的问题。
发明内容
本申请提供一种通信方法、终端及网络设备，用以解决在PRACH资源的位置存在多个时，终端如何检测并接收用于调度RAR的PDCCH信令的问题。
本申请实施例提供了一种通信方法，该方法包括：
终端根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为用于发送随机接入的前导码的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应；
所述终端根据所述第一标识检测所述第一信令。
根据本申请实施例提供的方法，终端通过预设的或由网络设备指示的第一资源的资源索引号确定号确定第一标识，从而根据所述第一标识检测用于调度随机接入过程中的随机接入响应的第一信令，从而可以在第一资源的位置存在多个时，根据确定出的第一标识检测并接收第一信令，从而解决了在第一资源的位置存在多个时，终端如何检测并接收用于调度第一信令的问题。
可选的，所述第一资源的资源索引号由网络设备指示时，所述第一资源的资源索引号为所述终端通过接收到的广播信息确定的，或者，所述第一资源的资源索引号为所述终端通过接收到的专有信令确定的。
可选的，所述第一资源的无线接口技术与第二信令的无线接口技术相同，所述第二信令用于触发所述终端发起随机接入过程；或者
所述第一资源的无线接口技术为所述第二信令所指示的无线接口技术，所述第二信令用于触发所述终端发起随机接入过程；或者
所述第一资源的无线接口技术为所述终端接收到的切换命令所指示的无线接口技术，所述切换命令为所述终端切换之前的源网络设备接收所述网络设备发送的切换命令之后转发的，所述切换命令用于指示所述终端由所述源网络设备切换到所述网络设备。
可选的，所述第一资源的无线接口技术与所述第二信令的无线接口技术为不同的无线接口技术，所述终端若确定所述第二信令所指示的无线接口技术中包括至少一个用于发送所述前导码的资源，则从所述至少一个用于发送所述前导码的资源中选择一个资源作为所述第一资源。
可选的，所述终端根据所述第一标识检测第一信令，包括：
所述终端在从第一单位时间之后的第Q个第二单位时间开始的第一时间长度内根据所述第一标识检测所述第一信令，所述第一时间长度为P个第三单位时间的长度的和，所述第一单位时间为所述前导码传输结束的单位时间，所述第二单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，所述第三单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，Q为大于或等于0的正整数，P为大于或等于1的正整数；或者
所述终端若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第二时间长度内根据所述第一标识检测所述第一信令，所述第二时间长度为S个第四单位时间的长度的和，所述第四单位时间的长度与所述第一资源的 无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，S为大于等于1的正整数；或者
所述终端若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第三时间长度内根据所述第一标识检测所述第一信令，所述第三时间长度为K个第五单位时间的长度的和与第一时间长度的差值，所述K个第五单位时间的长度的和大于或等于所述第一时间长度，所述第五单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，K为大于等于1的正整数。
本申请实施例提供一种通信方法，所述方法包括：
网络设备向终端指示第一资源的资源索引号，所述第一资源为用于发送随机接入的前导码的资源；
所述网络设备接收所述终端通过所述第一资源发送的前导码。
根据本申请实施例提供的方法，网络设备通过向终端指示第一资源的资源索引号，从而使得终端根据第一资源的资源索引号确定第一标识，从而使得终端可以根据所述第一标识检测用于调度随机接入过程中的随机接入响应的第一信令，从而解决了在第一资源的位置存在多个时，终端如何检测并接收用于调度第一信令的问题。
可选的，所述网络设备向终端指示第一资源的资源索引号，包括：
所述网络设备通过广播信息向所述终端指示所述第一资源的资源索引号，或者，所述网络设备通过专有信令向所述终端指示所述第一资源的资源索引号。
可选的，所述网络设备向终端指示第一资源的资源索引号之后，还包括：
所述网络设备向所述终端发送第二信令，所述第二信令指示出所述第一资源的无线接口技术。
可选的，所述方法还包括：
所述网络设备向所述终端切换之前的源网络设备发送切换命令，所述切换命令指示出所述第一资源的无线接口技术。
本申请实施例提供一种终端，包括：
处理单元，用于根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为用于发送随机接入的前导码的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应；
收发单元，用于根据所述第一标识检测所述第一信令。
可选的，所述第一资源的资源索引号由网络设备指示时，所述第一资源的资源索引号为通过接收到的广播信息确定的，或者，所述第一资源的资源索引号为通过接收到的专有信令确定的。
可选的，所述第一资源的无线接口技术与第二信令的无线接口技术相同，所述第二信令用于触发所述终端发起随机接入过程；或者
所述第一资源的无线接口技术为所述第二信令所指示的无线接口技术，所述第二信令用于触发所述终端发起随机接入过程；或者
所述第一资源的无线接口技术为所述终端接收到的切换命令所指示的无线接口技术，所述切换命令为所述终端切换之前的源网络设备接收所述网络设备发送的切换命令之后 转发的，所述切换命令用于指示所述终端由所述源网络设备切换到所述网络设备。
可选的，所述第一资源的无线接口技术与所述第二信令的无线接口技术为不同的无线接口技术，所述终端若确定所述第二信令所指示的无线接口技术中包括至少一个用于发送所述前导码的资源，则从所述至少一个用于发送所述前导码的资源中选择一个资源作为所述第一资源。
可选的，所述收发单元具体用于：
在从第一单位时间之后的第Q个第二单位时间开始的第一时间长度内根据所述第一标识检测所述第一信令，所述第一时间长度为P个第三单位时间的长度的和，所述第一单位时间为所述前导码传输结束的单位时间，所述第二单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，所述第三单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，Q为大于或等于0的正整数，P为大于或等于1的正整数；或者
若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第二时间长度内根据所述第一标识检测所述第一信令，所述第二时间长度为S个第四单位时间的长度的和，所述第四单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，S为大于等于1的正整数；或者
若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第三时间长度内根据所述第一标识检测所述第一信令，所述第三时间长度为K个第五单位时间的长度的和与第一时间长度的差值，所述K个第五单位时间的长度的和大于或等于所述第一时间长度，所述第五单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，K为大于等于1的正整数。
本申请实施例提供一种网络设备，包括：
处理单元，用于通过收发单元向终端指示第一资源的资源索引号，所述第一资源为用于发送随机接入的前导码的资源；
所述收发单元，用于接收所述终端通过所述第一资源发送的前导码。
可选的，所述收发单元具体用于：
通过广播信息向所述终端指示所述第一资源的资源索引号，或者，通过专有信令向所述终端指示所述第一资源的资源索引号。
可选的，所述收发单元还用于：
向所述终端发送第二信令，所述第二信令指示出所述第一资源的无线接口技术。
可选的，所述收发单元还用于：
向所述终端切换之前的源网络设备发送切换命令，所述切换命令指示出所述第一资源的无线接口技术。
本申请实施例提供一种终端，包括：
处理器，用于根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为用于发送随机接入的前导码的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应；
收发机，用于根据所述第一标识检测所述第一信令。
可选的，所述第一资源的资源索引号由网络设备指示时，所述第一资源的资源索引号为通过接收到的广播信息确定的，或者，所述第一资源的资源索引号为通过接收到的专有信令确定的。
可选的，所述第一资源的无线接口技术与第二信令的无线接口技术相同，所述第二信令用于触发所述终端发起随机接入过程；或者
所述第一资源的无线接口技术为所述第二信令所指示的无线接口技术，所述第二信令用于触发所述终端发起随机接入过程；或者
所述第一资源的无线接口技术为所述终端接收到的切换命令所指示的无线接口技术，所述切换命令为所述终端切换之前的源网络设备接收所述网络设备发送的切换命令之后转发的，所述切换命令用于指示所述终端由所述源网络设备切换到所述网络设备。
可选的，所述第一资源的无线接口技术与所述第二信令的无线接口技术为不同的无线接口技术，所述终端若确定所述第二信令所指示的无线接口技术中包括至少一个用于发送所述前导码的资源，则从所述至少一个用于发送所述前导码的资源中选择一个资源作为所述第一资源。
可选的，所述收发机具体用于：
在从第一单位时间之后的第Q个第二单位时间开始的第一时间长度内根据所述第一标识检测所述第一信令，所述第一时间长度为P个第三单位时间的长度的和，所述第一单位时间为所述前导码传输结束的单位时间，所述第二单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，所述第三单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，Q为大于或等于0的正整数，P为大于或等于1的正整数；或者
若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第二时间长度内根据所述第一标识检测所述第一信令，所述第二时间长度为S个第四单位时间的长度的和，所述第四单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，S为大于等于1的正整数；或者
若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第三时间长度内根据所述第一标识检测所述第一信令，所述第三时间长度为K个第五单位时间的长度的和与第一时间长度的差值，所述K个第五单位时间的长度的和大于或等于所述第一时间长度，所述第五单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，K为大于等于1的正整数。
本申请实施例提供一种网络设备，包括：
BBU，用于通过RRU向终端指示第一资源的资源索引号，所述第一资源为用于发送随机接入的前导码的资源；
所述RRU，用于接收所述终端通过所述第一资源发送的前导码。
可选的，所述RRU具体用于：
通过广播信息向所述终端指示所述第一资源的资源索引号，或者，通过专有信令向所述终端指示所述第一资源的资源索引号。
可选的，所述RRU还用于：
向所述终端发送第二信令，所述第二信令指示出所述第一资源的无线接口技术。
可选的，所述RRU还用于：
向所述终端切换之前的源网络设备发送切换命令，所述切换命令指示出所述第一资源的无线接口技术。
在一个可能的设计中，本申请提供的网络设备可以包含用于执行上述方法设计中网络设备行为相对应的模块。所述模块可以是软件和/或是硬件。
在一个可能的设计中，本申请提供的终端可以包含用于执行上述方法设计中终端行为相对应的模块。所述模块可以是软件和/或是硬件。
本申请的又一方面提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
本申请的又一方面提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
附图说明
图1为适用于本申请实施例的一种系统网络示意图；
图2为现有技术中一种竞争的随机接入过程示意图；
图3为本申请实施例提供的一种通信方法流程示意图；
图4为本申请实施例提供的一种资源分布示意图；
图5为本申请实施例提供的一种RAR窗口示意图；
图6为本申请实施例提供的一种RAR窗口示意图；
图7为本申请实施例提供的一种终端结构示意图；
图8为本申请实施例提供的一种终端结构示意图；
图9为本申请实施例提供的一种网络设备结构示意图；
图10为本申请实施例提供的一种网络设备结构示意图。
具体实施方式
本申请实施例可以应用于各种移动通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、演进的长期演进(evolved Long Term Evolution，eLTE)系统、NR系统等其它移动通信系统。
图1示出了适用于本申请实施例的一种系统网络示意图。如图1所示，至少一个终端10与无线接入网(Radio access network，RAN)进行通信。所述RAN包括至少一个网络设备20，为清楚起见，图中只示出一个网络设备20和一个终端10。所述RAN与核心网络(core network，CN)相连。可选的，所述CN可以耦合到一个或者更多的外部网络(External Network)，例如英特网，公共交换电话网(public switched telephone network，PSTN)等。
以下，对本申请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，也可以称为用户设备(User Equipment，UE)，是一种具有通信功能的设备，可以向用户提供语音和/或数据服务，可以包括具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备等。在不同的网络中终端可以叫做不同的名称，例如：用户设备，移动台，用户单元，站台，蜂窝电话，个人数字助理，无线调制解调器，无线通信设备，手持设备，膝上型电脑，无绳电话，无线本地环路台等。为描述方便，本申请中简称为终端。
2)、网络设备，可以是基站(base station,简称BS)、云网络中的无线接入设备或中继站等具有无线收发功能的设备，是一种部署在无线接入网用以提供无线通信功能的设备。在不同的无线接入系统中基站的名称可能有所不同，例如在而在通用移动通讯系统(Universal Mobile Telecommunications System，简称：UMTS)网络中基站称为节点B(NodeB),在LTE网络中的基站称为演进的节点B(evolved NodeB，简称：eNB或者eNodeB)，在未来5G系统中可以称为收发节点(Transmission Reception Point，TRP)网络节点或g节点B(g-NodeB，gNB)。
3)、无线接口技术(Radio Interface Technology，RIT)还可以称为numerology或长期演进(Long Term Evolution，LTE)技术，无线接口技术可以包括以下一项或多项：子载波间隔、循环前缀长度、多址接入(multiple access)方式、调制编码方式(Modulation and Coding Scheme，MCS)、帧结构(frame structure)、物理信道(physical channel)、传输信道(transport channel)、逻辑信道(Logical Channel,LCH)、媒体接入控制(Medium Access Control，MAC)、无线链路控制(Radio Link Control，RLC)、分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)、无线资源控制(Radio Resource Control，RRC)。主同步信道(Primary Synchronization Channel，P-SCH)、辅同步信道(Secondary Synchronization Channel，S-SCH)等。
不同的无线接口技术，可以满足不同业务的不同的带宽和时延的需求。不同的无线接口技术可以通过频分或者时分的方式，配置给同一个终端。在不同的无线接口技术上，可能存在不同的物理随机接入信道PRACH资源。如图1所示，在一个小区上通过频分的方式存在两种numerology，其中numerology1的传输时间间隔(TTI，transmission timer interval)比numerology2的TTI更长，numerology1上存在长周期的PRACH资源，numerology2上存在短周期的PRACH资源。
本申请实施例可以应用于竞争的随机接入，也可以应用于非竞争的随机接入。如图2所示，为现有技术中一种竞争的随机接入过程示意图。
S201：终端向网络设备发送随机接入前导码(preamble)，该preamble是在物理随机接入信道(Physical Random Access Channel，PRACH)资源上发送的。该消息也可以称之为消息1(Message1，Msg1)。
S202：网络设备向终端回复随机接入响应(Random Access Response，RAR)消息。
该消息也可以称之为消息2(Msg2)。
终端发送了preamble之后，将在RAR窗口内监听并检测PDCCH中的第一PDCCH信令，该第一PDCCH信令采用RA-RNTI加扰，用于调度发送给终端的RAR消息。终端若确定出发送preamble的PRACH资源的t_id和f_id，则可以根据公式(1)确定RA-RNTI，从而根据RA-RNTI检测出第一PDCCH信令，从而接收到RAR消息。
S203：终端向网络设备发送消息3(Msg3)。
S204：网络设备向终端发送竞争解决(contention resolution)消息，该消息也可以称之为消息4(Msg4)。
基于上述描述，参见图3，为本申请实施例提供的一种通信方法流程图。该方法包括：
步骤301：网络设备向终端指示第一资源的资源索引号，所述第一资源为用于发送随机接入的前导码的资源。
所述第一资源的资源索引号用于生成加扰第一信令的第一标识。第一信令以及第一标识的内容在后面详细描述。
需要说明的是，本申请实施例中，第一资源可以是指PRACH资源，或者其他用于发送前导码的资源。
步骤302：所述网络设备接收所述终端通过所述第一资源发送的前导码。
步骤303：终端根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为用于发送随机接入的前导码的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应。
本申请实施例中，第一标识可以是指通过公式(1)确定出的RA-RNTI，或者作用类似于RA-RNTI的标识。第一信令可以为在随机接入过程中，网络设备接收到终端发送的前导码之后发送的用于调度RAR的PDCCH信令，或者作用类似于该PDCCH信令的信令。
步骤304：所述终端根据所述第一标识检测所述第一信令。
步骤301中，网络设备可以通过多种方式向终端指示所述第一资源的资源索引号。一种可能的实现方式中，网络设备可以通过广播信息向所述终端指示所述第一资源的资源索引号。另一种可能的实现方式中，所述网络设备可以通过专有信令向所述终端指示所述第一资源的资源索引号。其中，专有信令可以是指无线资源控制信令(Radio Resource Control，RRC)等信令。另一种可能的实现方式中，所述网络设备可以通过高层信令和底层信令组合的方式向所述终端指示所述第一资源的资源索引号。例如，所述网络设备可以通过RRC信令指示多种资源索引号，并通过媒体接入控制(Media Access Control，MAC)控制单元(control element，CE)或PDCCH信令指示终端使用其中的一种资源索引号，以实现网络设备灵活修改第一资源的资源索引号。另一种可能实现的方式中，所述网络设备可以通过物理层信令向所述终端指示所述第一资源的资源索引号。其中，物理层信令可以是指PDCCH信令。
步骤302之前，网络设备还可以向终端指示发送前导码的第一资源的无线接口技术。一种可能的实现方式中，网络设备可以向所述终端发送第二信令，所述第二信令指示出所述第一资源的无线接口技术。
需要说明的是，所述第二信令用于触发所述终端发起随机接入过程。例如，第二信令可以为网络设备向终端发送的触发所述终端发起随机接入过程的PDCCH信令，或者作用类似于该PDCCH信令的信令。
另一种可能的实现方式中，若终端从源网络设备切换到所述网络设备，此时所述网络设备为所述终端需要切换的目的网络设备，所述网络设备可以向源网络设备发送切换命令，所述切换命令指示出所述第一资源的无线接口技术。源网络设备接收到所述网络设备发送的切换命令之后，向所述终端转发所述切换命令，从而实现向终端指示发送前导码的 第一资源的无线接口技术。
步骤302中，网络设备接收到终端发送的前导码之后，可以根据终端发送前导码的第一资源的资源索引号确定第一标识，然后向终端发送RAR消息，其中所述RAR消息是通过采用第一标识加扰的第一信令调度的。终端先通过第一标识解扰了第一信令之后，才能根据第一信令的调度指示接收到RAR消息。
需要说明的是，资源索引号可以唯一指示出一个资源的时频位置，本申请实施例对资源索引号的实现方式并不限定，具体可以参考LTE系统等系统中的规定，在此不再赘述。
步骤303中，终端确定第一标识之前，可以先通过第一资源向网络设备发送前导码。终端在发送前导码之前，可以先确定发送第一资源的无线接口技术。本申请实施例中，终端可以通过多种方式确定发送第一资源的无线接口技术。第一种可能的实现方式中，终端在发送前导码之前，可能会接收到网络设备发送的用于触发所述终端发起随机接入过程的第二信令，此时终端可以确定第二信令的无线接口技术。终端直接将第二信令的无线接口技术确定为所述第一资源的无线接口技术，即在该实现方式中，所述第一资源的无线接口技术与第二信令的无线接口技术相同。
第二种可能的实现方式中，终端在接收到网络设备发送的用于触发所述终端发起随机接入过程的第二信令之后，将所述第二信令所指示的无线接口技术确定为所述第一资源的无线接口技术，即在该实现方式中，所述第一资源的无线接口技术为所述第二信令所指示的无线接口技术。所述第二信令所指示的无线接口技术可以为所述PDCCH信令所指示的无线接口技术，也可以为参考无线接口技术，也可以为其它无线接口技术，具体可以根据实际情况确定，在此不再赘述。其中，参考无线接口技术可以是指主同步信道或辅同步信号的无线接口技术，或者由协议规定的某个频率区间的参考无线接口技术。
需要说明的是，所述第一资源的无线接口技术与所述第二信令的无线接口技术为不同的无线接口技术时，所述终端若确定所述第二信令所指示的无线接口技术中包括至少一个用于发送所述前导码的资源，则从所述至少一个用于发送所述前导码的资源中选择一个资源作为所述第一资源。需要说明的是，所述终端可以随机选择一个资源作为发送所述前导码的第一资源，也可以按照其他方式选择第一资源。可选的，所述终端可以不总是选择所述至少一个用于发送所述前导码的资源中的第一个资源作为发送所述前导码的第一资源。
举例来说，如图4所示，为本申请实施例提供的一种资源分布示意图。图4中，无线接口技术1的TTI长度为T1，无线接口技术2的TTI长度为T2，T1的长度为T1的3倍。终端在无线接口技术1中接收到第二信令，所述第二信令指示终端在无线接口技术2中选择第一资源发送前导码，由于无线接口技术2中存在多个第一资源，终端可以随机选择一个第一资源作为发送所述前导码的资源。
第三种可能的实现方式中，终端由源网络设备切换到目的的所述网络设备(即终端切换的目的网络设备)过程中，可能需要向所述网络设备发送前导序列。所述网络设备会向源网络设备发送切换命令，所述切换命令用于指示所述终端由所述源网络设备切换到所述网络设备。所述网络设备可以通过所述切换命令向终端指示所述第一资源的无线接口技术。此时，所述源网络设备接收到所述网络设备发送的切换命令之后，向所述终端转发所述切换命令，所述终端从而确定所述第一资源的无线接口技术。
终端发送前导码之后，可以根据发送前导码的第一资源的资源索引号确定第一标识。本申请实施例中，所述第一资源的资源索引号可以为预设的，也可以为网络设备向终端指 示的，还可以为终端根据第一资源的分布规律确定的。
举例来说，第一资源的资源索引号为预设的时，第一资源的位置已经固定，终端可以直接根据预设的资源索引号确定第一标识。在该情况下，终端可以是在参考无线接口技术的第一资源中发送前导码，也可以是在任意的无线接口技术的第一资源中发送前导码。
再举例来说，第一资源的资源索引号为网络设备向终端指示的时，终端可以通过接收到的广播信息接收到的专有信令确定第一资源的资源索引号，从而确定第一标识。在该情况下，终端可以是在参考无线接口技术的第一资源中发送前导码，也可以是在任意的无线接口技术的第一资源中发送前导码。这种情况下，终端不需要知道一共有多少种第一资源，终端只需要通过网络设备的指示确定第一资源的资源索引号就可以了。
再举例来说，第一资源的资源索引号为网络设备向终端指示的时，终端可以按照第一资源在频域上的顺序确定第一资源的资源索引号。例如，第一资源在频域上的顺序为按照频率升序或者降序的方式依次分配资源索引号，终端根据第一资源的频率可以推测出该第一资源的资源索引号。第一资源在频域上的顺序可以是协议规定的，也可以是基站通过广播信息或专有信令向终端指示的。
通过上述方法，终端在第一资源中发送前导码之后，可以根据预设的第一资源的资源索引号或网络设备指示的第一资源的资源索引号确定第一标识，从而可以在第一资源的位置存在多个时，根据确定出的第一标识检测并接收第一信令。
步骤304中，终端可以根据第一标识，在RAR窗口中检测第一信令。本申请实施例中，RAR窗口的起始位置以及持续长度可以有多种实现方式，下面分别描述。
第一种可能的实现方式中，RAR窗口的起始位置可以为第一单位时间之后的第Q个第二单位时间的起始时刻，RAR窗口的持续长度可以为第一时间长度。其中，所述第一时间长度为P个第三单位时间的长度的和，所述第一单位时间为所述前导码传输结束的单位时间，所述第二单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，所述第三单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，Q为大于或等于0的正整数，P为大于或等于1的正整数。
需要说明的是，单位时间可以为调度传输块(Transport Block，TB)的时间间隔，例如可以是指一个TTI(Transmission Time Interval，传输时间间隔)等时间长度。单位时间也可以为子帧，或者两次PDCCH检测时机(PDCCH monitoring ooccasion)之间的时间间隔。
结合前面的描述，在该实现方式中，RAR窗口的持续长度可以以参考无线接口技术的单位时间的长度为依据进行计算，也可以以发送前导码的第一资源的无线接口技术的单位时间的长度为依据进行计算。相应的，RAR窗口的起始位置可以以参考无线接口技术的单位时间的长度为依据进行计算，也可以以发送前导码的第一资源的无线接口技术的单位时间的长度为依据进行计算。
在该实现方式中，终端可以在从第一单位时间之后的第Q个第二单位时间开始的第一时间长度内根据所述第一标识检测所述第一信令。
需要说明的是，Q、P的具体取值可以由终端和网络设备预先约定，也可以由协议进行规定，具体根据实际情况确定，本申请实施例对此并不限定。
第二种可能的实现方式中，RAR窗口的起始位置可以为第一单位时间之后的第Q个第二单位时间的起始时刻，RAR窗口的持续长度可以包括第一时间长度和第二时间长度。 其中，所述第二时间长度为S个第四单位时间的长度的和，所述第四单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，S为大于等于1的正整数。
在该实现方式下，所述终端若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第二时间长度内根据所述第一标识检测所述第一信令。具体的，在第一时间长度内，所述终端可以在发送前导码的第一资源的无线接口技术的无线资源中，根据所述第一标识检测所述第一信令，若未检测到所述第一信令，则在第二时间长度内，在参考无线接口技术的无线资源中，根据所述第一标识检测所述第一信令。当然，在第一时间长度内，所述终端也可以在参考无线接口技术的无线资源中检测所述第一信令，若未检测到所述第一信令，则在第二时间长度内，在发送前导码的第一资源的无线接口技术的无线资源中检测所述第一信令。
需要说明的是，无线资源可以是指PDCCH信道或者其他时频资源，在此并不限定。同时，S的具体取值可以由终端和网络设备预先约定，也可以由协议进行规定，具体根据实际情况确定，本申请实施例对此并不限定。
举例来说，如图5所示，为本申请实施例提供的一种RAR窗口示意图。图5中，无线接口技术1为参考无线接口技术，无线接口技术2为发送前导码的第一资源的无线接口技术，无线接口技术1的单位时间的长度为无线接口技术2的单位时间的长度的3倍。RAR窗口包括第一时间长度T1和第二时间长度T2，其中T1包括6个无线接口技术2中的单位时间的长度的和，T2包括3个无线接口技术1中的单位时间的长度的和。在T1内，终端可以在无线接口技术2的无线资源中，根据第一标识检测第一信令，若未检测到所述第一信令，则在T2内，在无线接口技术1的无线资源中，根据第一标识检测所述第一信令。
第三种可能的实现方式中，RAR窗口的起始位置可以为第一单位时间之后的第Q个第二单位时间的起始时刻，RAR窗口的持续长度可以包括第一时间长度和第三时间长度。其中，所述第三时间长度为K个第五单位时间的长度的和与第一时间长度的差值，所述第五单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，K为大于等于1的正整数。所述K个第五单位时间的长度的和可以大于所述第一时间长度，当所述K个第五单位时间的长度的和小于或等于所述第一时间长度时，所述第三时间长度为0。
在该实现方式下，所述终端若确定在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第三时间长度内根据所述第一标识检测所述第一信令。具体的，在第一时间长度内，所述终端可以在发送前导码的第一资源的无线接口技术的无线资源中，根据所述第一标识检测所述第一信令，若未检测到所述第一信令，则在第三时间长度内，在参考无线接口技术的无线资源中，根据所述第一标识检测所述第一信令。当然，在第一时间长度内，所述终端也可以在参考无线接口技术的无线资源中检测所述第一信令，若未检测到所述第一信令，则在第三时间长度内，在发送前导码的第一资源的无线接口技术的无线资源中检测所述第一信令。需要说明的是，第三时间长度为0时，所述终端只在第一时间长度内检测所述第一信令。
需要说明的是，K的具体取值可以由终端和网络设备预先约定，也可以由协议进行规定，具体根据实际情况确定，本申请实施例对此并不限定。
举例来说，如图6所示，为本申请实施例提供的一种RAR窗口示意图。图6中，无 线接口技术1为参考无线接口技术，无线接口技术2为发送前导码的第一资源的无线接口技术，无线接口技术1的单位时间的长度为无线接口技术2的单位时间的长度的3倍。RAR窗口包括第一时间长度T1和第三时间长度T2，其中T1包括6个无线接口技术2中的单位时间的长度的和，T2为T3与T1的差值，T3为3个无线接口技术1中的单位时间的长度的和。在T1内，终端可以在无线接口技术2的无线资源中，根据第一标识检测第一信令，若未检测到所述第一信令，则在T2内，在无线接口技术1的无线资源中，根据第一标识检测所述第一信令。
再举例来说，结合图6，若T2为1个无线接口技术1中的单位时间的长度的和与T1的差值，此时T2为0。
通过上述方法，终端在第一时间段内没有检测到第一信令时，可以继续在第二时间段或第三时间段检测第一信令，如果在第二时间段或第三时间段检测到第一信令，从而可以减少重新发起随机接入过程的次数，从而提高终端的接入速度，减少终端的接入延迟。
由于不同无线接口技术的单位时间不同，当一个子帧可能包括多个单位时间，且每个单位时间都有发送前导码的第一资源时，一个子帧可能包括多个第一资源，因此需要采用新的方法计算第一标识。
本申请实施例中，可以采用公式(2)计算第一标识：
RA-RNTI＝1+slot_id+(1+max_slot_id)×f_id······(2)
其中，RA-RNTI为第一标识，slot_id是第一资源的索引值，索引值可以是指第一资源的编号，用以区分时域上不同的第一资源。在时域上，可以以一个第一资源作为起始第一资源，并将起始第一资源的索引值设为0，然后按照时间顺序，对该起始第一资源后面的第一资源依次设置索引值，且设置的索引值每次均递增1，直到索引值取到最大值max_slot_id，然后对索引值取到最大值的第一资源之后的第一资源的索引值，再重新从0开始取值，直到取到最大值max_slot_id，依次周而复始。max_slot_id的取值和RAR窗口的起始位置和RAR窗口的持续长度有关，max_slot_id+1可以大于或等于目标时间段内，在时域上可以包括的第一资源的个数的最大值。其中，目标时间段是指终端从发送前导码结束的时刻开始，到RAR窗口结束的时刻之间的时间段。
举例来说，终端从发送前导码结束的时刻开始，到RAR窗口结束的时刻之间的时间段内，包括10个单位时间长度，每个单位时间长度最多可以包括1个PRACH资源，那么max_slot_id的取值可以为9。
max_slot_id也可以是一个系统帧内第一资源在时域上的最大的个数。
本申请实施例中，还可以采用公式(3)计算第一标识：
RA-RNTI＝1+t_id+slot_id×max_t_id+(1+max_slot_id×max_t_id)×f_id······(3)
其中，slot_id是一个子帧内的第一资源的索引值，用以区分一个子帧内时域上不同的第一资源。对任意一个子帧内的第一资源，将第一个第一资源的索引值设为0，对该第一资源后面的第一资源依次设置索引值，且设置的索引值每次均递增1，直到该子帧内的最后一个第一资源。max_slot_id是一个子帧内在时域上第一资源的最大的个数，举例来说，如果在一个子帧内，在一种numerology上有5个时域上不同的第一资源，而在另一种numerology上有7个时域上不同的第一资源，那么max_slot_id为7。max_t_id是一个系统帧内子帧的个数，现有技术中，max_t_id为10。
LTE中，为了避免周期性的使用PDCCH信令对终端进行调度，提出了半静态调度 (Semi-Persistent Scheduling，SPS)的机制，SPS资源被激活后，周期性的出现，终端周期性的在SPS资源上接收下行数据或者发送上行数据。
LTE中，由于仅在主小区上存在SPS配置，且只存在一种SPS配置，因此SPS资源的混合自动重传请求(Hybrid Automatic Repeat reQuest，HARQ)进程标识(identification，ID)通过下面的公式给出：
对下行SPS资源，可以通过公式(4)确定HARQ Process ID down：
HARQ Process ID down＝[floor(CURRENT_TTI/semiPersistSchedIntervalDL)]modulo numberOfConfSPS-Processes······(4)
其中，CURRENT_TTI＝[(SFN×10)+SN]，SFN为系统帧号，SN为子帧数量，semiPersistSchedIntervalDL为下行SPS资源的周期，numberOfConfSPS_Processes为最大下行HARQ进程数，floor()表示向下取值运算，modulo为取余运算符。
对上行SPS资源，可以通过公式(5)确定HARQ Process ID up：
HARQ Process ID up＝[floor(CURRENT_TTI/semiPersistSchedIntervalUL)]modulo numberOfConfUlSPS_Processes······(5)
其中，CURRENT_TTI＝[(SFN×10)+SN]，SFN为系统帧号，SN为子帧数量，semiPersistSchedIntervalUL为上行SPS资源的周期，numberOfConfUlSPS_Processes为最大上行HARQ进程数，floor()表示向下取值运算，modulo为取余运算符。
NR中，可能不同的numerology上配置不同的SPS资源，可以看到当一个小区存在多种SPS资源时，上述公式可能计算出相同的HARQ进程号。
如果不同的numerology使用一个HARQ实体，也就是，共用这个HARQ实体中的HARQ进程，那么不同的SPS资源计算出相同的HARQ进程号就会造成HARQ重传无法和初传进行对应。
为了解决上述问题，可以在计算HARQ process ID的时候，加无线接口技术索引号或SPS配置索引号作为新的参数，下面分别描述：
对下行SPS资源：
对于SPS配置1，可以通过公式(6)计算HARQ Process ID：
HARQ Process ID＝[floor(CURRENT_TTI/semiPersistSchedIntervalDL)]modulo numberOfConfSPS_Processes_1······(6)
对于SPS配置2，可以通过公式(7)计算HARQ Process ID：HARQ Process ID＝numberOfConfSPS_Processes_1+[floor(CURRENT_TTI/semiPersistSchedIntervalDL)]modulo numberOfConfSPS_Processes_2······(7)
对于SPS配置3，可以通过公式(8)计算HARQ Process ID：
HARQ Process ID＝numberOfConfSPS_Processes_1+numberOfConfSPS_Processes_2+[floor(CURRENT_TTI/semiPersistSchedIntervalDL)]modulo numberOfConfSPS-Processes-3······(8)
上述公式(6)至公式(8)中，numberOfConfSPS_Processes_1、numberOfConfSPS_Processes_2、numberOfConfSPS_Processes_3指的是每一个下行SPS配置上允许的最大的HARQ进程数量。
对上行SPS资源：
对于SPS配置1，可以通过公式(9)计算HARQ Process ID：
HARQ Process ID＝[floor(CURRENT_TTI/semiPersistSchedIntervalUL)]modulo numberOfConfUlSPS_Processes_1······(9)
对于SPS配置2，可以通过公式(10)计算HARQ Process ID：HARQ Process ID＝numberOfConfSPS_Processes_1+[floor(CURRENT_TTI/semiPersistSchedIntervalUL)]modulo numberOfConfUlSPS_Processes_2······(10)
对于SPS配置3，可以通过公式(11)计算HARQ Process ID：HARQ Process ID＝numberOfConfSPS_Processes_1+numberOfConfSPS_Processes_2+[floor(CURRENT_TTI/semiPersistSchedIntervalUL)]modulo numberOfConfUlSPS_Processes_3······(11)
上述公式(9)至公式(11)中，numberOfConfUlSPS_Processes_1、numberOfConfUlSPS_Processes_2、numberOfConfUlSPS_Processes_3指的是每一个上行SPS配置上允许的最大的HARQ进程数量。
基于相同的技术构思，本申请实施例还提供一种终端，该终端可执行图3所述的方法流程。
如图7所示，为本申请实施例提供的一种终端的结构示意图。为了便于说明，图7仅示出了终端的主要部件。如图7所示，终端700包括处理器701、收发机702、天线703、存储器704以及输入输出装置705。处理器701主要用于对通信协议以及通信数据进行处理，以及对整个终端进行控制，执行软件程序，处理软件程序的数据。存储器704主要用于存储软件程序和数据，例如存储上述实施例中所描述的码本。收发机702主要用于基带信号与射频信号的转换以及对射频信号的处理。天线703主要用于收发电磁波形式的射频信号。具输入输出装置705，例如触摸屏、显示屏或键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端700开机后，处理器701可以读取存储单元中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器701对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端700时，收发机702中的射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器701，处理器701将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图7仅示出了一个存储器和处理器。在实际的终端中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端进行控制，执行软件程序，处理软件程序的数据。图7中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端可以包括多个基带处理器以适应不同的网络制式，终端可以包括多个中央处理器以增强其处理能力，终端的各个部件可以通过各种总线连接。基带处理器也可以表述为基带处理电路或者基带处理芯片。中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序 以实现基带处理功能。
示例性的，在申请实施例中，可以将具有收发功能的天线和收发机视为终端700的收发单元802，将具有处理功能的处理器视为终端700的处理单元801。如图8所示，终端800包括收发单元802和处理单元801。收发单元802也可以称为收发器、收发机或收发装置等。可选的，可以将收发单元802中用于实现接收功能的器件视为接收单元，将收发单元802中用于实现发送功能的器件视为发送单元，即收发单元802包括接收单元和发送单元示例性的，接收单元也可以称为接收机、接收器或接收电路等，发送单元可以称为发射机、发射器或者发射电路等。
上述终端可以用于实现前述方法实施例中的方法，具体的：
处理器，用于根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为用于发送随机接入的前导码的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应；
收发机，用于根据所述第一标识检测所述第一信令。
本申请实施例进一步给出实现上述方法实施例中各步骤及方法的装置实施例。前述方法实施例的方法、步骤、技术细节以及技术效果等同样适用于装置实施例，后续不再详细说明。
基于相同的技术构思，本申请实施例还提供一种网络设备，该网络设备可执行图3所述的方法流程。
如图9所示，为本申请实施例提供的一种网络设备的结构示意图。
图9示出一种网络设备的结构示意图，该网络设备可应用于如图1所示的系统。网络设备900包括一个或多个远端射频单元(remote radio unit,RRU)901和一个或多个基带单元(baseband unit，BBU)902。RRU901可以称为收发单元、收发机、收发电路或者收发器等等，其可以包括至少一个天线9011和射频单元9012。RRU901分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端发送上述实施例中的信令指示或参考信号。BBU902部分主要用于进行基带处理，对网络设备进行控制等。RRU901与BBU902可以是可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
BBU902为网络设备的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。在一个示例中，BBU902可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如5G网络)，也可以分别支持不同接入制式的无线接入网。BBU902还包括存储器9021和处理器9022。存储器9021用以存储必要的指令和数据。处理器9022用于控制网络设备进行必要的动作。存储器9021和处理器9022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板公用相同的存储器和处理器。此外每个单板上还设置有必要的电路。
示例性的，在申请实施例中，可以将具有收发功能的天线和收发机视为网络设备900的收发单元，将具有处理功能的处理器视为网络设备900的处理单元。如图10所示，网络设备1000包括收发单元1001和处理单元1002。收发单元1001也可以称为收发器、收发机或收发装置等。可选的，可以将收发单元1001中用于实现接收功能的器件视为接收单元，将收发单元1001中用于实现发送功能的器件视为发送单元，即收发单元1001包括 接收单元和发送单元示例性的，接收单元也可以称为接收机、接收器或接收电路等，发送单元可以称为发射机、发射器或者发射电路等。
上述网络设备可以用于实现前述方法实施例的方法，具体的：
BBU902，用于通过RRU901向终端指示第一资源的资源索引号，所述第一资源为用于发送随机接入的前导码的资源；
RRU901，用于接收所述终端通过所述第一资源发送的前导码。
本申请实施例进一步给出实现上述方法实施例中各步骤及方法的装置实施例。前述方法实施例的方法、步骤、技术细节以及技术效果等同样适用于装置实施例，后续不再详细说明。
本申请实施例还提供了一种计算机可读存储介质，用于存储为执行上述处理器所需执行的计算机软件指令，其包含用于执行上述处理器所需执行的程序。
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指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的范围。这样，倘若本申请的这些修改和变型属于本申请权利要求的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (18)

  1. 一种通信方法，其特征在于，包括：
    终端根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为用于发送随机接入的前导码的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应；
    所述终端根据所述第一标识检测所述第一信令。
  2. 根据权利要求1所述的方法，其特征在于，所述第一资源的资源索引号由网络设备指示时，所述第一资源的资源索引号为所述终端通过接收到的广播信息确定的，或者，所述第一资源的资源索引号为所述终端通过接收到的专有信令确定的。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一资源的无线接口技术与第二信令的无线接口技术相同，所述第二信令用于触发所述终端发起随机接入过程；或者
    所述第一资源的无线接口技术为所述第二信令所指示的无线接口技术，所述第二信令用于触发所述终端发起随机接入过程；或者
    所述第一资源的无线接口技术为所述终端接收到的切换命令所指示的无线接口技术，所述切换命令为所述终端切换之前的源网络设备接收所述网络设备发送的切换命令之后转发的，所述切换命令用于指示所述终端由所述源网络设备切换到所述网络设备。
  4. 根据权利要求3所述的方法，其特征在于，所述第一资源的无线接口技术与所述第二信令的无线接口技术为不同的无线接口技术，所述终端若确定所述第二信令所指示的无线接口技术中包括至少一个用于发送所述前导码的资源，则从所述至少一个用于发送所述前导码的资源中选择一个资源作为所述第一资源。
  5. 根据权利要求1至4任一项所述的方法，其特征在于，所述终端根据所述第一标识检测第一信令，包括：
    所述终端在从第一单位时间之后的第Q个第二单位时间开始的第一时间长度内根据所述第一标识检测所述第一信令，所述第一时间长度为P个第三单位时间的长度的和，所述第一单位时间为所述前导码传输结束的单位时间，所述第二单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，所述第三单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，Q为大于或等于0的正整数，P为大于或等于1的正整数；或者
    所述终端若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第二时间长度内根据所述第一标识检测所述第一信令，所述第二时间长度为S个第四单位时间的长度的和，所述第四单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，S为大于等于1的正整数；或者
    所述终端若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第三时间长度内根据所述第一标识检测所述第一信令，所述第三时间长度为K个第五单位时间的长度的和与第一时间长度的差值，所述K个第五单位时间的长度的和大于或等于所述第一时间长度，所述第五单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，K为大于 等于1的正整数。
  6. 一种通信方法，其特征在于，所述方法包括：
    网络设备向终端指示第一资源的资源索引号，所述第一资源为用于发送随机接入的前导码的资源；
    所述网络设备接收所述终端通过所述第一资源发送的前导码。
  7. 根据权利要求6所述的方法，其特征在于，所述网络设备向终端指示第一资源的资源索引号，包括：
    所述网络设备通过广播信息向所述终端指示所述第一资源的资源索引号，或者，所述网络设备通过专有信令向所述终端指示所述第一资源的资源索引号。
  8. 根据权利要求6或7所述的方法，其特征在于，所述网络设备向终端指示第一资源的资源索引号之后，还包括：
    所述网络设备向所述终端发送第二信令，所述第二信令指示出所述第一资源的无线接口技术。
  9. 根据权利要求6至8任一所述的方法，其特征在于，所述方法还包括：
    所述网络设备向所述终端切换之前的源网络设备发送切换命令，所述切换命令指示出所述第一资源的无线接口技术。
  10. 一种终端，其特征在于，包括：
    处理单元，用于根据第一资源的资源索引号确定第一标识，所述第一资源的资源索引号为预设的或由网络设备指示的，所述第一资源为用于发送随机接入的前导码的资源，所述第一标识用于对第一信令进行加扰，所述第一信令用于调度随机接入过程中的随机接入响应；
    收发单元，用于根据所述第一标识检测所述第一信令。
  11. 根据权利要求10所述的终端，其特征在于，所述第一资源的资源索引号由网络设备指示时，所述第一资源的资源索引号为通过接收到的广播信息确定的，或者，所述第一资源的资源索引号为通过接收到的专有信令确定的。
  12. 根据权利要求10或11所述的终端，其特征在于，所述第一资源的无线接口技术与第二信令的无线接口技术相同，所述第二信令用于触发所述终端发起随机接入过程；或者
    所述第一资源的无线接口技术为所述第二信令所指示的无线接口技术，所述第二信令用于触发所述终端发起随机接入过程；或者
    所述第一资源的无线接口技术为所述终端接收到的切换命令所指示的无线接口技术，所述切换命令为所述终端切换之前的源网络设备接收所述网络设备发送的切换命令之后转发的，所述切换命令用于指示所述终端由所述源网络设备切换到所述网络设备。
  13. 根据权利要求12所述的终端，其特征在于，所述第一资源的无线接口技术与所述第二信令的无线接口技术为不同的无线接口技术，所述终端若确定所述第二信令所指示的无线接口技术中包括至少一个用于发送所述前导码的资源，则从所述至少一个用于发送所述前导码的资源中选择一个资源作为所述第一资源。
  14. 根据权利要求10至13任一项所述的终端，其特征在于，所述收发单元具体用于：
    在从第一单位时间之后的第Q个第二单位时间开始的第一时间长度内根据所述第一标识检测所述第一信令，所述第一时间长度为P个第三单位时间的长度的和，所述第一单位 时间为所述前导码传输结束的单位时间，所述第二单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，所述第三单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，Q为大于或等于0的正整数，P为大于或等于1的正整数；或者
    若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第二时间长度内根据所述第一标识检测所述第一信令，所述第二时间长度为S个第四单位时间的长度的和，所述第四单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，S为大于等于1的正整数；或者
    若确定根据所述第一标识在第一时间长度内未检测到所述第一信令，则在第一时间长度结束时刻开始的第三时间长度内根据所述第一标识检测所述第一信令，所述第三时间长度为K个第五单位时间的长度的和与第一时间长度的差值，所述K个第五单位时间的长度的和大于或等于所述第一时间长度，所述第五单位时间的长度与所述第一资源的无线接口技术的单位时间的长度或者参考无线接口技术的单位时间的长度相同，K为大于等于1的正整数。
  15. 一种网络设备，其特征在于，包括处理单元和收发单元；
    所述处理单元，用于通过所述收发单元向终端指示第一资源的资源索引号，所述第一资源为用于发送随机接入的前导码的资源；
    所述收发单元，用于接收所述终端通过所述第一资源发送的前导码。
  16. 根据权利要求15所述的网络设备，其特征在于，所述收发单元具体用于：
    通过广播信息向所述终端指示所述第一资源的资源索引号，或者，通过专有信令向所述终端指示所述第一资源的资源索引号。
  17. 根据权利要求15或16所述的网络设备，其特征在于，所述收发单元还用于：
    向所述终端发送第二信令，所述第二信令指示出所述第一资源的无线接口技术。
  18. 根据权利要求15至17任一所述的网络设备，其特征在于，所述收发单元还用于：
    向所述终端切换之前的源网络设备发送切换命令，所述切换命令指示出所述第一资源的无线接口技术。
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