WO2018127047A1 - 一种小区接入的方法、基站及终端 - Google Patents

一种小区接入的方法、基站及终端 Download PDF

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Publication number
WO2018127047A1
WO2018127047A1 PCT/CN2018/070084 CN2018070084W WO2018127047A1 WO 2018127047 A1 WO2018127047 A1 WO 2018127047A1 CN 2018070084 W CN2018070084 W CN 2018070084W WO 2018127047 A1 WO2018127047 A1 WO 2018127047A1
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WIPO (PCT)
Prior art keywords
terminal
reciprocity
transceiving
base station
preamble
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PCT/CN2018/070084
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English (en)
French (fr)
Inventor
王飞
吴丹
童辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Mobile Communications Group Co Ltd
Research Institute of China Mobile Communication Co Ltd
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China Mobile Communications Group Co Ltd
Research Institute of China Mobile Communication Co Ltd
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Publication of WO2018127047A1 publication Critical patent/WO2018127047A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel 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
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present disclosure relates to the field of mobile communications technologies, and in particular, to a method, a base station, and a terminal for cell access.
  • the 5G system design introduces the concept of multi-beam, such as the method and flow of the multi-beam based initial cell access in question.
  • the base station For multi-beam based initial cell access, the base station generally needs to transmit a new air interface-primary synchronization signal (NR-PSS) and/or a new air interface-secondary synchronization signal NR-SSS and/or a new air interface (NR) by means of beam scanning.
  • System information which may include a new air interface physical broadcast channel (NR-PBCH) and a new air interface system information block (NR-SIB).
  • the optimal transmit beam (TRP-Tx-Beam) of the base station in the downlink can be equated with the optimal receive beam (TRP-Rx-Beam) of the base station in the uplink, or in the uplink
  • the optimal receive beam (TRP-Rx-Beam) of the base station is equivalent to the optimal transmit beam (TRP-Tx-Beam) of the base station in the downlink, which is called the reciprocity of the transmit and receive beams on the base station side, that is, the base station side. Meet the Beam correspondence.
  • the optimal receive beam (UE-Rx-Beam) of the terminal in the downlink can be equated with the optimal transmit beam (UE-Tx-Beam) of the terminal in the uplink, or Relating the optimal transmit beam (UE-Tx-Beam) of the terminal in the uplink to the optimal receive beam (UE-Rx-Beam) of the terminal in the downlink is called reciprocity of the terminal with the transmit and receive beams. That is, the terminal satisfies the Beam correspondence.
  • the related art has not provided a scheme capable of supporting multi-beam based initial cell access in a 5G system for various situations in which the base station side has/has no transceiving of the transmitting and receiving beams and the reciprocity of the terminal with/without transmitting and receiving beams. .
  • the technical problem to be solved by the embodiments of the present disclosure is to provide a cell access method, a base station, and a terminal, which are used to effectively support multi-beam based initial cell access in a 5G system.
  • a method for cell access provided by an embodiment of the present disclosure includes:
  • the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • the base station detects the preamble sent by the terminal according to the combination of the transceiving and reciprocity, and determines an optimal transmit and receive beam of the uplink and downlink according to the detection result of the resource where the preamble is located.
  • the terminal determines a transceiving reciprocity combination on which the preamble is transmitted, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • the terminal transmits the preamble based on the combination of the transceiving and reciprocity.
  • the embodiment of the present disclosure further provides a base station, including:
  • a first determining unit configured to determine a transceiving reciprocity combination on which the terminal transmits the preamble, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • a detecting unit configured to detect a preamble sent by the terminal according to the transceiver reciprocity combination
  • the second determining unit is configured to determine an optimal transmit and receive beam of the uplink and downlink according to the detection result of the resource where the preamble is located.
  • the embodiment of the present disclosure further provides a terminal, including:
  • a first determining unit configured to determine a transceiving reciprocity combination on which the preamble is transmitted, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • a sending unit configured to send the preamble based on the transceiving and reciprocity combination.
  • the embodiment of the present disclosure further provides a base station, including a processor, a transceiver, and a memory;
  • the processor is configured to read a program in the memory and perform the following process:
  • the terminal Determining, by the terminal, a transceiving reciprocity combination on which the preamble is transmitted, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • the transceiver is configured to receive and transmit data
  • the memory is used to store data used by the processor to perform operations.
  • the embodiment of the present disclosure further provides a terminal, including a processor, a transceiver, and a memory;
  • the processor is configured to read a program in the memory and perform the following process:
  • the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • the transceiver is configured to receive and transmit data
  • the memory is used to store data used by the processor to perform operations.
  • Embodiments of the present disclosure also provide a non-transitory computer readable storage medium storing computer readable instructions executable by a processor, the processor executing when the computer readable instructions are executed by a processor The following operations:
  • the terminal Determining, by the terminal, a transceiving reciprocity combination on which the preamble is transmitted, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • the optimal transmit and receive beams of the uplink and downlink are determined according to the detection result of the resource where the preamble is located.
  • Embodiments of the present disclosure also provide a non-transitory computer readable storage medium storing computer readable instructions executable by a processor, the processor executing when the computer readable instructions are executed by a processor The following operations:
  • the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity assumption of the terminal;
  • a preamble is transmitted based on the combination of transceiving and reciprocity.
  • the cell access method, the base station, and the terminal provided by the embodiments of the present disclosure implement a random access preamble in a physical random access channel (PRACH) process, which may It is applicable to various situations in which the base station side has/has no transceiving of the transmitting and receiving beams and the reciprocity of the terminal with/without transmitting and receiving beams, and can effectively support the initial cell access based on multiple beams in the 5G system.
  • PRACH physical random access channel
  • FIG. 1 is a schematic flowchart of a method for cell access applied to a base station side according to some embodiments of the present disclosure
  • FIG. 2 is a schematic flowchart of a method for cell access applied to a terminal side according to some embodiments of the present disclosure
  • FIG. 3 is a schematic structural diagram of a base station according to some embodiments of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a terminal according to some embodiments of the present disclosure.
  • FIG. 5 is a schematic diagram of an application scenario of Example 1 according to some embodiments of the present disclosure.
  • FIG. 6 is a schematic diagram of an application scenario of Example 2 according to some embodiments of the present disclosure.
  • FIG. 7 is a schematic diagram of an application scenario of Example 3 according to some embodiments of the present disclosure.
  • FIG. 8 is a schematic diagram of an application scenario of Example 4 according to some embodiments of the present disclosure.
  • the form of the base station is not limited, and may be a Macro Base Station, a Pico Base Station, a Node B (a name of a 3G mobile base station), an enhanced base station (eNB), and a home enhanced type.
  • Base station Femto eNB or Home eNode B or Home eNB or HeNB
  • relay station access point
  • RRU Remote Radio Unit
  • RRH Remote Radio Head
  • 5G mobile communication system Network side nodes such as a central unit (CU, Central Unit) and a distributed unit (DU, distributed unit).
  • the terminal can be a mobile phone (or cell phone), or other device capable of transmitting or receiving wireless signals, including user equipment (UE), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, Cordless phones, wireless local loop (WLL) stations, CPE (Customer Premise Equipment) capable of converting mobile signals into WiFi signals, mobile smart hotspots, smart home appliances, or other non-human operations can spontaneously and mobilely communicate Network communication equipment, etc.
  • UE user equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • CPE Customer Premise Equipment
  • Some embodiments of the present disclosure provide a method for initial cell access in a mobile communication system, and in particular, a random access preamble transmission in a physical random access channel (PRACH) flow is proposed.
  • the scheme can be applied to various situations in which the base station side has/has no transceiving of the transmitting and receiving beams and the reciprocity of the terminal with/without transmitting and receiving beams, and can effectively support the initial cell access based on the multi-beam in the 5G system.
  • PRACH physical random access channel
  • a method for cell access provided by some embodiments of the present disclosure, when applied to a base station side, includes the following steps:
  • Step 11 The base station determines a transceiving reciprocity combination on which the terminal transmits the preamble, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal.
  • the terminal of some embodiments of the present disclosure performs transmission of a random access preamble in a PRACH procedure based on a specific combination of transceiving and reciprocity.
  • the transceiver reciprocity combination specifically includes whether the base station has transceiving beam reciprocity and whether the terminal has transceiving beam reciprocity.
  • the foregoing transceiver reciprocity combination may be a default combination configured by the base station and the terminal in advance.
  • the base station and the terminal have the same default transceiving and reciprocity combination, and in this step, the base station may directly
  • the default transceiving reciprocity combination is used as a transceiving reciprocity combination on which the terminal transmits the preamble.
  • the base station may also specify a combination of transceiving and reciprocity adopted by the terminal.
  • the base station may broadcast and send the first indication information, which may be specifically sent by using a system message (such as NR-PBCH and/or NR-SIB) or signaling, where the first indication information includes a base station.
  • a system message such as NR-PBCH and/or NR-SIB
  • the base station may determine, according to the first indication information that is sent in advance, a transceivability reciprocity combination on which the terminal transmits the preamble.
  • the terminal can independently select its own transceiving beam reciprocity assumption.
  • the base station may broadcast and send the second indication information, which may be specifically sent by using a system message (such as NR-PBCH and/or NR-SIB) or signaling, where the second indication information includes a base station.
  • the transceiving beam reciprocity hypothesis is assumed, and the terminal autonomously selects the terminal's transceiving beam reciprocity hypothesis.
  • the terminal may send the third indication information of the reciprocal beam reciprocity of the transceiver selected by the terminal to the base station by explicit transmission or implicit transmission.
  • the base station may determine, according to the second indication information and the third indication information, a transceivability reciprocity combination on which the terminal transmits the preamble.
  • An implementation manner of the explicit transmission is as follows: The terminal can send the related information in the preamble, and the preamble in the related art needs to be extended.
  • An implementation manner of the foregoing implicit transmission is: determining, by the terminal, a first preamble packet corresponding to the transceiving beam reciprocity hypothesis of the terminal according to the self-selected transceiving beam reciprocity hypothesis, and grouping from the first preamble
  • the preamble used by the terminal is selected for transmission, wherein different preamble packets correspond to different transceiving beam reciprocity assumptions of the terminal.
  • the base station can determine the transceiving beam reciprocity hypothesis corresponding to the first preamble packet according to the first preamble packet to which the preamble transmitted by the terminal belongs, and obtain the transceiving beam reciprocity hypothesis of the terminal.
  • Step 12 The base station detects the preamble sent by the terminal according to the combination of the transceiving and reciprocity.
  • the base station may determine the location of the first resource corresponding to the transceiving reciprocity combination.
  • different transceiving reciprocity combinations correspond to different predefined resources, and different transceiving and reciprocity
  • the resources corresponding to the combination have different time-frequency resource locations.
  • the resources corresponding to the transceiving reciprocity combination are predefined. For example, referring to the resource location where the PSS is located, a plurality of resources having different time-frequency resource locations are defined, and each resource corresponds to a combination of transceiving and reciprocity. It can be understood that it is usually necessary to define four kinds of resources to correspond to the four types of transceivability combinations that may exist.
  • each resource (such as the first resource) includes multiple groups of sub-resources with the same time domain location but different frequency domain locations, and different sub-resources correspond to different predefined downlink optimal beams, and
  • the terminal transmits a preamble on a sub-resource corresponding to one of the downlink optimal beams.
  • the downlink optimal beam includes a base station optimal transmit beam and/or a terminal optimal receive beam of the downlink.
  • the downlink optimal beam may include the base station optimal transmit beam and the terminal optimal receive beam at the same time. Then, the base station detects and receives the preamble sent by the terminal through each receiving beam of the base station by using a beam scanning manner on the first resource.
  • Step 13 The base station determines an optimal transmission and reception beam of the uplink and downlink according to the detection result of the resource where the preamble is located.
  • the specific optimal transmit and receive beams for the uplink and downlink may be specifically determined in the following manner, where:
  • the optimal transmit beam of the base station is obtained by the base station according to the first downlink optimal beam corresponding to the first sub-resource of the detected preamble, or according to the assumption that the base station has the reciprocity of the transmit and receive beams and the optimal receive beam of the base station. definite;
  • the optimal receiving beam of the terminal is obtained by the base station according to the first downlink optimal beam corresponding to the first sub-resource of the detected preamble, or according to the assumption that the terminal has the reciprocity of the transmitting and receiving beams and the optimal transmitting beam of the terminal. definite;
  • the optimal receiving beam of the base station is determined by the base station according to the receiving beam of the base station corresponding to the preamble with the best received signal quality, or is determined according to the assumption that the base station has the reciprocity of the transmitting and receiving beams and the optimal transmitting beam of the base station;
  • the optimal transmit beam of the terminal is determined by the base station according to the terminal receive beam corresponding to the preamble with the best received signal quality, or is determined according to the assumption that the terminal has the reciprocity of the transmit and receive beams and the optimal receive beam of the terminal.
  • the base station may detect the preamble according to the first resource position in step 13 above.
  • the first sub-resource determines the first downlink optimal beam corresponding to the first sub-resource, thereby obtaining the base station optimal transmit beam and the terminal optimal receive beam of the downlink.
  • the base station may further obtain an uplink base station optimal receive beam and a terminal optimal transmit beam according to the base station receive beam and the terminal transmit beam corresponding to the preamble with the best received signal quality on the first sub-resource.
  • some embodiments of the present disclosure implement the determination of the optimal beam in the initial cell access process, and may be applicable to the reciprocity of the base station side with/without transmitting and receiving beams and the reciprocity of the terminal with/without transmitting and receiving beams.
  • Various situations of sexuality can effectively support multi-beam based initial cell access in 5G systems.
  • the terminal needs to know the base station optimal transmit beam and the terminal optimal receive beam when transmitting the preamble. For this reason, in some embodiments of the present disclosure, the base station may use the beam scan mode before the foregoing step 11.
  • Predetermined information is separately transmitted through respective transmit beams of the base station, the predetermined information including at least one of synchronization information (such as PSS/SSS), physical broadcast channel information (PBCH), and system message (SIB).
  • synchronization information such as PSS/SSS
  • PBCH physical broadcast channel information
  • SIB system message
  • the transceiver reciprocity combination includes four different combinations:
  • the first resource includes N groups of sub-resources with the same time domain location but different frequency domain locations, where N is equal to the base station.
  • the terminal uses a beam scanning manner on the sub-resource corresponding to one of the downlink optimal beams, and separately transmits the preamble through each of the transmitting beams of the terminal.
  • the number of terminal beams refers to the number of received beams of the terminal or the number of transmitted beams of the terminal. Usually, the number of received beams of the terminal or the number of transmitted beams of the terminal are equal.
  • the number of base station beams refers to the number of receive beams of the base station or the number of transmit beams of the base station. Usually, the number of receive beams of the base station or the number of transmit beams of the base station are equal.
  • the first resource includes the M group sub-resources with the same time domain location but different frequency domain locations.
  • the M is equal to the number of the terminal beams, and the terminal uses a beam scanning manner on the sub-resources corresponding to one of the downlink optimal beams, and respectively transmits the preamble through each of the transmitting beams of the terminal.
  • the first resource includes L group sub-resources having the same time domain location but different frequency domain locations, when the transceiver reciprocity combination is that the base station does not have the transceiving beam reciprocity but the terminal has the transceiving beam reciprocity.
  • the L is equal to the product of the number of the base station beams and the number of the terminal beams.
  • the terminal transmits the preamble through the beam corresponding to the terminal corresponding to the sub-resource on the sub-resource corresponding to the one of the downlink optimal beams.
  • the terminal transmit beam corresponding to the sub-resource may be determined according to the ID of the terminal optimal receive beam included in the downlink optimal beam corresponding to the sub-resource, for example, the terminal transmit beam adopting the ID of the optimal receive beam of the terminal. Send it.
  • the first resource includes a P group sub-resource with the same time domain location but different frequency domain locations, where P is equal to the terminal beam.
  • the number of the terminal transmits a preamble by using a terminal corresponding to the sub-resource to send a preamble to the sub-resource corresponding to the downlink optimal beam.
  • the terminal transmit beam corresponding to the sub-resource may be determined according to the ID of the terminal optimal receive beam included in the downlink optimal beam corresponding to the sub-resource, for example, the terminal transmit beam adopting the ID of the optimal receive beam of the terminal. Send it.
  • a method for cell access provided by some embodiments of the present disclosure, when applied to a terminal side, includes the following steps:
  • Step 21 The terminal determines a transceiving reciprocity combination on which the preamble is transmitted, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal.
  • the terminal may combine the pre-configured default transceiving reciprocity as the transceiving reciprocity combination on which the preamble is transmitted.
  • the terminal may determine, according to the first indication information that is sent by the base station, the transceiving reciprocity combination on which the terminal sends the preamble, where the first indication information includes a reciprocal beam reciprocity hypothesis of the base station. And the terminal's transceiving beam reciprocity assumption. At this time, before the step 21, the terminal may further receive the first indication information that the base station broadcasts.
  • the terminal may determine, according to the second indication information that is sent by the base station, the reciprocal beam reciprocity hypothesis of the base station, and the terminal autonomously selects the transceiving beam reciprocity hypothesis of the terminal, and obtains the terminal transmission The combination of transceiving and reciprocity based on the preamble; wherein the second indication information includes a transceiving beam reciprocity hypothesis of the base station, and indicates that the terminal autonomously selects a transceiving beam reciprocity hypothesis of the terminal.
  • the terminal may further determine a first preamble packet corresponding to the transceiving beam reciprocity hypothesis of the terminal, and select a preamble used by the terminal from the first preamble packet for use in the subsequent step 22. The transmission, wherein different preamble packets correspond to different transceiving beam reciprocity assumptions of the terminal.
  • Step 22 The terminal sends the preamble based on the combination of the transceiving and reciprocity.
  • the terminal determines the location of the first resource corresponding to the transceiving reciprocity combination based on the transceiving reciprocity combination, wherein some embodiments of the present disclosure predefine different transceiving reciprocity combinations corresponding to different resources.
  • the different resources have different time-frequency resource locations, and each resource, such as the first resource, includes multiple groups of sub-resources with the same time domain location but different frequency domain locations, and different sub-resources corresponding to different predefined downlinks.
  • An optimal beam, the downlink optimal beam comprising a base station optimal transmit beam and/or a terminal optimal receive beam of the downlink.
  • the terminal determines, according to the predetermined first downlink optimal beam that includes the base station optimal transmit beam and/or the terminal optimal receive beam, the first corresponding to the first downlink optimal beam in the first resource. The location of a sub-resource, and then the terminal transmits a preamble on the first sub-resource.
  • the terminal needs to know in advance the downlink optimal beam of the base station and the downlink optimal beam of the optimal receiving beam of the terminal.
  • the terminal may receive the predetermined information sent by the base station.
  • the method for determining the downlink optimal beam Specifically, the terminal uses a beam scanning manner to receive predetermined information sent by the base station by using each receiving beam of the terminal, where the predetermined information is that the base station adopts a beam scanning manner.
  • the respective transmit beams of the base station are respectively sent, and the predetermined information includes at least one of synchronization information, physical broadcast channel information, and system messages, and then the terminal determines the optimal transmit beam and the base station according to the received result of the predetermined information.
  • the terminal optimally receives the beam.
  • the transceiver reciprocity combination includes four different combinations:
  • the first resource includes N groups of sub-resources with the same time domain location but different frequency domain locations, where N is equal to the base station.
  • the terminal sends a preamble on the first sub-resource. Specifically, the terminal uses a beam scanning manner on the first sub-resource, and separately transmits a preamble through each transmit beam of the terminal.
  • the first resource includes the M group sub-resources with the same time domain location but different frequency domain locations. Where M is equal to the number of terminal beams.
  • the terminal sends a preamble on the first sub-resource. Specifically, the terminal uses a beam scanning manner on the first sub-resource, and separately transmits a preamble through each transmit beam of the terminal.
  • the first resource includes L group sub-resources having the same time domain location but different frequency domain locations, when the transceiver reciprocity combination is that the base station does not have the transceiving beam reciprocity but the terminal has the transceiving beam reciprocity.
  • L is equal to the product of the number of base station beams and the number of terminal beams.
  • the first resource includes a P group sub-resource with the same time domain location but different frequency domain locations, where P is equal to the terminal beam. Quantity.
  • the terminal sends a preamble on the first sub-resource, where the terminal sends a preamble to the first sub-resource, and the pre-transmission code is sent by the terminal corresponding to the first sub-resource.
  • some embodiments of the present disclosure provide a base station, including:
  • the first determining unit 31 is configured to determine a transceiving reciprocity combination on which the terminal transmits the preamble, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal.
  • the detecting unit 32 is configured to detect a preamble sent by the terminal according to the transceiving and reciprocity combination.
  • the second determining unit 33 is configured to determine an optimal transmit and receive beam of the uplink and downlink according to the detection result of the resource where the preamble is located.
  • the first determining unit is specifically configured to use a preset pre-configured default transceiving reciprocity combination as a transceiving reciprocity combination on which the terminal transmits the preamble.
  • the first determining unit is specifically configured to: determine, according to the first indication information that is sent by the base station, the transceiving reciprocity combination on which the terminal sends the preamble, where the first indication is The information includes the transceiving beam reciprocity assumption of the base station and the transceiving beam reciprocity assumption of the terminal.
  • the base station further includes: a first sending unit, configured to broadcast and send the first indication information.
  • the first determining unit is specifically configured to: determine, according to the second indication information that is sent in advance by the base station, and the third indication information that is sent by the terminal explicitly or implicitly, to determine the sending preamble of the terminal. a combination of transceiving and reciprocity based on the code; wherein the second indication information includes a transceiving beam reciprocity hypothesis of the base station, and indicates that the terminal autonomously selects a transceiving beam reciprocity hypothesis of the terminal; the third indication information includes There are terminal transceiving beam reciprocity assumptions.
  • the first determining unit is further configured to: determine, according to the first preamble packet to which the preamble sent by the terminal belongs, determine a transceiving beam reciprocity hypothesis corresponding to the first preamble packet, and obtain a transceiving beam of the terminal. Reciprocity assumptions in which different preamble packets correspond to different transceiving beam reciprocity assumptions of the terminal.
  • the second sending unit is configured to separately transmit predetermined information by using each of the transmitting beams of the base station by using a beam scanning manner, where the predetermined information includes at least one of synchronization information, physical broadcast channel information, and system message.
  • the detecting unit includes:
  • a third determining unit configured to detect, according to the combination of the transceiving and reciprocity, the preamble sent by the terminal, including:
  • a fourth determining unit configured to determine a location of the first resource corresponding to the transceiving reciprocity combination, where different transceiving reciprocity combinations correspond to different predefined resources, and different transceiving reciprocity combinations correspond to Resources have different time-frequency resource locations;
  • a receiving unit configured to detect, by using a beam scanning manner, a preamble sent by the terminal by using each of the receiving beams of the base station;
  • the first resource includes multiple groups of sub-resources with the same time domain location but different frequency domain locations, different sub-resources corresponding to different predefined downlink optimal beams, and the terminal is optimized in one of the downlinks.
  • a preamble is transmitted on a sub-resource corresponding to the beam, where the downlink optimal beam includes a base station optimal transmit beam and/or a terminal optimal receive beam of the downlink.
  • the first resource includes N sets of sub-resources having the same time domain location but different frequency domain locations, wherein N is equal to the base station, when the transceiver reciprocity combination is such that neither the base station nor the terminal has the transceiving beam reciprocity.
  • the product of the number of the beams and the number of the terminal beams the terminal uses a beam scanning method on the sub-resources corresponding to one of the downlink optimal beams, and respectively transmits the preamble through each of the transmitting beams of the terminal.
  • the first resource includes M group sub-resources having the same time domain position but different frequency domain positions, wherein the first and second resources have the same time domain location but different frequency domain locations.
  • M is equal to the number of the terminal beams, and the terminal uses a beam scanning manner on the sub-resources corresponding to one of the downlink optimal beams, and respectively transmits the preamble through each of the transmission beams of the terminal.
  • the first resource includes an L group of sub-resources having the same time domain position but different frequency domain positions, where the receiving and reciprocating combination is that the base station does not have the transceiving beam reciprocity but the terminal has the transceiving beam reciprocity.
  • L is equal to the product of the number of base station beams and the number of terminal beams.
  • the first resource includes a group P sub-resource with the same time domain location but different frequency domain positions, where the transceiving reciprocity combination is that the base station and the terminal both have the transceiving beam reciprocity.
  • the P is equal to the number of the terminal beams, and the terminal transmits the preamble through the beam corresponding to the terminal corresponding to the first sub-resource on the sub-resource corresponding to the one of the downlink optimal beams.
  • the second determining unit is specifically configured to determine an optimal transmit and receive beam of the uplink and downlink in the following manner:
  • the optimal transmit beam of the base station is obtained according to the first downlink optimal beam corresponding to the first sub-resource of the detected preamble, or is determined according to the assumption that the base station has the reciprocity of the transmit and receive beams and the optimal receive beam of the base station. of;
  • the optimal receiving beam of the terminal is obtained according to the first downlink optimal beam corresponding to the first sub-resource of the detected preamble, or is determined according to the assumption that the terminal has the transmissive beam reciprocity and the optimal transmit beam of the terminal. of;
  • the optimal receiving beam of the base station is determined according to the receiving beam of the base station corresponding to the preamble with the best received signal quality, or is determined according to the assumption that the base station has the reciprocity of the transmitting and receiving beams and the optimal transmitting beam of the base station;
  • the optimal transmit beam of the terminal is determined according to the terminal receiving beam corresponding to the preamble with the best received signal quality, or is determined according to the assumption that the terminal has the transmissive beam reciprocity and the optimal receiving beam of the terminal.
  • the second determining unit may be configured to detect the first sub-resource of the preamble according to the first resource location. Determining a first downlink optimal beam corresponding to the first sub-resource, obtaining a downlink base station optimal transmit beam and a terminal optimal receive beam; and receiving, according to the received signal quality-preferred preamble, the base station receive beam and the terminal sending The beam obtains the base station optimal receive beam and the terminal optimal transmit beam of the uplink.
  • some embodiments of the present disclosure provide a terminal, including:
  • the first determining unit 41 is configured to determine a transceiving reciprocity combination on which the preamble is transmitted, where the transceiving reciprocity combination includes a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal.
  • the sending unit 42 is configured to send the preamble based on the transceiving and reciprocity combination.
  • the first determining unit is specifically configured to: use a pre-configured default transceiving reciprocity combination as a transceiving reciprocity combination on which the preamble is transmitted.
  • the first determining unit is specifically configured to: determine, according to the first indication information that is sent by the base station, the transceiving reciprocity combination on which the terminal sends the preamble, where the first indication information is It includes the transceiving beam reciprocity assumption of the base station and the transceiving beam reciprocity assumption of the terminal.
  • the terminal at this time further includes: a first receiving unit, configured to receive first indication information that is sent and sent by the base station.
  • the first determining unit is specifically configured to: determine, according to the second indication information that is sent by the base station, the reciprocal beam reciprocity hypothesis of the base station, and independently select the transceiving beam of the terminal a hypothesis of obtaining a transceiving reciprocity combination on which the terminal transmits a preamble; wherein the second indication information includes a transceiving beam reciprocity hypothesis of the base station, and indicates that the terminal autonomously selects the transceiving beam reciprocity of the terminal Assumption.
  • the first determining unit is further configured to: determine a first preamble packet corresponding to the transceiving beam reciprocity hypothesis of the terminal, and select a preamble used by the terminal from the first preamble packet, where Different preamble packets correspond to different transceiving beam reciprocity assumptions of the terminal.
  • the above terminals may also include:
  • a second receiving unit configured to receive predetermined information sent by the base station by using each of the receiving beams of the terminal, where the predetermined information is sent by the base station by using each of the transmitting beams of the base station.
  • the predetermined information includes at least one of synchronization information, physical broadcast channel information, and system message;
  • a second determining unit configured to determine, according to the receiving result of the predetermined information, a base station optimal transmit beam and a terminal optimal receive beam.
  • the sending unit includes:
  • a third determining unit configured to determine, according to the combination of the transceiving and reciprocity, a location of the first resource corresponding to the transceiving reciprocity combination, where different transceiving reciprocity combinations correspond to different resources defined in advance
  • the resources corresponding to the different combinations of the transceiving and reciprocity combinations have different time-frequency resource locations, and the first resources include multiple groups of sub-resources with the same time-domain location but different frequency domain locations, and different sub-resources corresponding to different predefined a downlink optimal beam, where the downlink optimal beam includes a base station optimal transmit beam and/or a terminal optimal receive beam of the downlink;
  • a fourth determining unit configured to determine, according to the predetermined first downlink optimal beam that includes the base station optimal transmit beam and/or the terminal optimal receive beam, the first downlink and the first downlink optimal The location of the first sub-resource corresponding to the beam;
  • a sending processing unit configured to send a preamble on the first sub-resource.
  • the first resource includes N sets of sub-resources having the same time domain location but different frequency domain locations, wherein N is equal to the base station, when the transceiver reciprocity combination is such that neither the base station nor the terminal has the transceiving beam reciprocity.
  • the sending processing unit is specifically configured to: use a beam scanning manner on the first sub-resource, and separately send the preamble through each transmitting beam of the terminal.
  • the first resource includes M group sub-resources having the same time domain position but different frequency domain positions, wherein the first and second resources have the same time domain location but different frequency domain locations.
  • M is equal to the number of terminal beams.
  • the sending processing unit is specifically configured to: use a beam scanning manner on the first sub-resource, and separately send the preamble through each transmitting beam of the terminal.
  • the first resource includes an L group of sub-resources having the same time domain position but different frequency domain positions, where the receiving and reciprocating combination is that the base station does not have the transceiving beam reciprocity but the terminal has the transceiving beam reciprocity.
  • L is equal to the product of the number of base station beams and the number of terminal beams.
  • the sending processing unit is specifically configured to send, by using a terminal corresponding to the first sub-resource, a beam transmission preamble on the first sub-resource.
  • the first resource includes a group P sub-resource with the same time domain location but different frequency domain locations, where P is equal to the number of terminal beams.
  • the sending processing unit is specifically configured to send, by using a terminal corresponding to the first sub-resource, a beam transmission preamble on the first sub-resource.
  • the transmission beam is simply referred to as a transmission beam
  • the reception beam is simply referred to as a reception beam.
  • the base station may indicate the terminal through a system message (such as NR-PBCH and/or NR-SIB) or other signaling, so that the terminal knows which base station side is based on the transceiving beam reciprocity assumption and which terminal's transceiving beam reciprocity. Assume that a subsequent random-access preamble is sent.
  • a system message such as NR-PBCH and/or NR-SIB
  • the base station instructs the terminal to include information including a first field of 1 bit and a second field of 2 bits:
  • the first field is used to indicate the reciprocal beam reciprocity hypothesis of the base station side, and an implementation manner of the value of the first field is as follows:
  • the second field is used to indicate the transceiving beam reciprocity hypothesis of the terminal, and an implementation method of the value of the second field is as follows:
  • the terminal selects a reasonable terminal transceiver beam reciprocity hypothesis according to its actual situation to perform subsequent random-access preamble transmission, and tells the base station its own choice through the preamble.
  • the preamble is divided into two groups in the standard, and the selection is performed.
  • the preamble of the first group means that the terminal performs preamble transmission based on the terminal having the transceiving beam reciprocity, and if the other group is selected, it means that the terminal performs preamble transmission based on the terminal not having the transceiving beam reciprocity.
  • the base station can instruct the terminal to transmit the preamble based on the combination of the transceiving beam reciprocity.
  • FIG. 5 provides a random-access preamble transmission based on the assumption that neither the base station nor the terminal has the reciprocal beam reciprocity. As shown in FIG. 5, there are three beams on the base station side and two beams on the terminal.
  • the resources corresponding to the combination shown in FIG. 5, that is, the resource regions R1_TRP_Tx, R2_TRP_Tx, and R3_TRP_Tx are defined in advance for the combination of the assumptions of the above-described transceiving beam reciprocity.
  • the resource areas R1_TRP_Tx, R2_TRP_Tx, and R3_TRP_Tx occupy the same time resource, but occupy different frequency resources, and each of them includes two parts, namely: resource areas R1_UE_Rx and R2_UE_Rx.
  • the resource regions R1_UE_Rx and R2_UE_Rx are each a sub-resource corresponding to a specific set of downlink optimal beams.
  • the resource areas R1_UE_Rx and R2_UE_Rx occupy the same time resource but occupy different frequency resources, each of which includes two parts, namely: resource areas R1_UE_Tx and R2_UE_Tx.
  • the resource areas R1_UE_Tx and R2_UE_Tx occupy the same frequency resource, but occupy different time resources, each of which includes three parts: resource areas R1_TRP_Rx, R2_TRP_Rx and R3_TRP_Rx, which occupy the same frequency resource but occupy different Time resources.
  • the base station first transmits at least one of PSS, SSS, PBCH, and SIB on each of its transmit beams by means of beam scanning.
  • the terminal may receive the foregoing information by means of beam scanning, and further determine, according to the received result, a downlink optimal beam including a base station optimal transmit beam and a terminal optimal receive beam of the downlink.
  • the terminal determines, according to the downlink optimal beam, a corresponding sub-resource, for example, the resource region R1_UE_Rx. Then, the terminal transmits the preamble in a beam scanning manner on the resource region R1_UE_Rx, for example, on the resource corresponding to the first three small rectangular blocks in the resource region R1_UE_Rx, and transmits the signal in the transmit beam 1, the last 3 in the resource region R1_UE_Rx
  • the resources corresponding to the small rectangular blocks are transmitted by the transmit beam 2.
  • the base station determines resources corresponding to the combination, that is, resource areas R1_TRP_Tx, R2_TRP_Tx, and R3_TRP_Tx according to a combination of hypotheses of transceiving beam reciprocity. Then, the base station monitors the preamble on the resource areas R1_TRP_Tx, R2_TRP_Tx, and R3_TRP_Tx, and detects the received preamble by using the respective receive beams of the base station in a beam scanning manner.
  • the optimal terminal transmit beam in the uplink is UE_Tx_B1. Specifically,
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal terminal transmit beam in the uplink is UE_Tx_B2.
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal terminal transmit beam in the uplink is UE_Tx_B1. Specifically,
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal terminal transmit beam in the uplink is UE_Tx_B2.
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal base station transmit beam in the downlink is TRP_Tx_B2.
  • the optimal terminal receive beam and the uplink optimal in the downlink can be determined.
  • the optimal base station transmit beam in the downlink is TRP_Tx_B3.
  • the optimal terminal receive beam and uplink in the downlink can be determined.
  • FIG. 6 provides a random-access preamble transmission based on the assumption that the base station side has transceiving beam reciprocity and the terminal does not have transceiving beam reciprocity. As shown in FIG. 6, there are still three beams on the base station side and two beams on the terminal.
  • the base station monitors the preamble on the standard predefined resource area R_TRP_Tx, specifically,
  • the optimal terminal transmit beam in the uplink is UE_Tx_B1. Specifically,
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal terminal transmit beam in the uplink is UE_Tx_B2.
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal terminal transmit beam in the uplink is UE_Tx_B1. Specifically,
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the optimal base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal terminal transmit beam in the uplink is UE_Tx_B2.
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal base station receiving beam in the uplink is used as the optimal base station transmitting beam in the downlink.
  • FIG. 7 provides a random access preamble transmission based on the assumption that the base station side has no transceiving beam reciprocity and the terminal has transceiving beam reciprocity. As shown in FIG. 7, there are still three beams on the base station side and two beams on the terminal.
  • the base station monitors the preamble on the resource regions R1_TRP_Tx, R2_TRP_Tx, and R3_TRP_Tx,
  • the optimal terminal receiving beam in the downlink is UE_Rx_B1. Specifically,
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the optimal base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal terminal receiving beam in the downlink is UE_Rx_B2. Specifically,
  • the optimal base station receive beam in the uplink is TRP_Rx_B1;
  • the best base station receive beam in the uplink is TRP_Rx_B3.
  • the optimal base station transmit beam in the downlink is TRP_Tx_B2.
  • the optimal terminal receive beam and the uplink optimal in the downlink can be determined.
  • the optimal base station transmit beam in the downlink is TRP_Tx_B3.
  • the optimal terminal receive beam and uplink in the downlink can be determined.
  • the optimal terminal received beam in the downlink is used as the optimal terminal beam in the uplink.
  • FIG. 8 provides a random-access preamble transmission based on the assumption that both the base station and the terminal have transceiving beam reciprocity. As shown in FIG. 8, there are still three beams on the base station side and two beams on the terminal.
  • the base station monitors the preamble on the standard predefined resource area R_TRP_Tx. Specifically,
  • the optimal base station receiving beam in the uplink is used as the optimal base station transmitting beam in the downlink; according to the reciprocity of the terminal transmitting and receiving beams, the most in the downlink is The excellent terminal receives the beam as the optimal terminal beam in the uplink.
  • the cell access method, the base station, and the terminal provided by some embodiments of the present disclosure can perform random-access preamble transmission in the PRACH process, and can be applied to the reciprocity of the base station side with/without transmitting and receiving beams. And the case where the terminal has/has no reciprocity of the transmission and reception beams, and can effectively support the initial cell access based on the multi-beam in the 5G system.

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Abstract

本公开提供了一种小区接入的方法、基站及终端。所述小区接入的方法，包括：基站确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；基站根据所述收发互易性组合，检测所述终端发送的前导码，并根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。

Description

一种小区接入的方法、基站及终端
相关申请的交叉引用
本申请主张在2017年1月6日在中国提交的中国专利申请号No.201710010434.3的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及移动通信技术领域，具体涉及一种小区接入的方法、基站及终端。
背景技术
由于5G高频段大规模天线形成的单个波束较窄，无法覆盖整个小区，因此5G系统设计引入了多波束的概念，例如正在讨论的基于多波束的初始小区接入的方法和流程。
对于基于多波束的初始小区接入，基站一般需要通过波束扫描的方法发送新空口-主同步信号(NR-PSS)和/或新空口-辅同步信号NR-SSS和/或新空口(NR)系统信息，该系统信息可能包括新空口物理广播信道(NR-PBCH)和新空口系统信息块(NR-SIB)。
下面介绍本文所涉及的收发波束的互易性(Beam correspondence)的概念：
对于基站，如果可以把下行链路中基站的最优发送波束(TRP-Tx-Beam)等同于上行链路中基站的最优接收波束(TRP-Rx-Beam)，或可以把上行链路中基站的最优接收波束(TRP-Rx-Beam)等同于下行链路中基站的最优发送波束(TRP-Tx-Beam)，则称之为基站侧具备收发波束的互易性，即基站侧满足Beam correspondence。
类似的，对于终端来说，如果可以把下行链路中终端的最优接收波束(UE-Rx-Beam)等同于上行链路中终端的最优发送波束(UE-Tx-Beam)，或可以把上行链路中终端的最优发送波束(UE-Tx-Beam)等同于下行链路中终端的最优接收波束(UE-Rx-Beam)，则称之为终端具备收发波束的互易性，即终端 满足Beam correspondence。
相关技术还没有针对基站侧具备/不具备收发波束的互易性以及终端具备/不具备收发波束的互易性的各种情况，提供能够支持5G系统中基于多波束的初始小区接入的方案。
发明内容
本公开实施例要解决的技术问题是提供一种小区接入的方法、基站及终端，用以有效支持5G系统中基于多波束的初始小区接入。
为解决上述技术问题，本公开实施例提供的小区接入的方法，包括：
基站确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
基站根据所述收发互易性组合，检测所述终端发送的前导码，并根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。
本公开实施例提供的另一种小区接入的方法，包括：
终端确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
终端基于所述收发互易性组合，发送前导码。
本公开实施例还提供了一种基站，包括：
第一确定单元，用于确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
检测单元，用于根据所述收发互易性组合，检测所述终端发送的前导码；
第二确定单元，用于根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。
本公开实施例还提供了一种终端，包括：
第一确定单元，用于确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
发送单元，用于基于所述收发互易性组合，发送前导码。
本公开实施例还提供了一种基站，包括处理器、收发机和存储器；
其中，所述处理器用于读取所述存储器中的程序，执行下列过程：
确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
根据所述收发互易性组合，检测所述终端发送的前导码；
根据前导码所在资源的检测结果，确定上下行链路的最优收发波束；
所述收发机用于接收和发送数据；
所述存储器用于保存所述处理器执行操作时所使用的数据。
本公开实施例还提供了一种终端，包括处理器、收发机和存储器；
其中，所述处理器用于读取所述存储器中的程序，执行下列过程：
确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
基于所述收发互易性组合，发送前导码；
所述收发机用于接收和发送数据；
所述存储器用于保存所述处理器执行操作时所使用的数据。
本公开实施例还提供了一种非易失性计算机可读存储介质，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器执行以下操作：
确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
根据所述收发互易性组合，检测所述终端发送的前导码；
根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。
本公开实施例还提供了一种非易失性计算机可读存储介质，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器执行以下操作：
确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
基于所述收发互易性组合，发送前导码。
与相关技术相比，本公开实施例提供的小区接入的方法、基站及终端，实现了在物理随机接入信道(PRACH)流程中随机接入前导码(random-access preamble)的发送，可以适用于基站侧具备/不具备收发波束的互易性以及终端具备/不具备收发波束的互易性的各种情况，能够有效支持5G系统中基于多 波束的初始小区接入。
附图说明
图1为本公开一些实施例的小区接入的方法应用于基站侧时的流程示意图；
图2为本公开一些实施例的小区接入的方法应用于终端侧时的流程示意图；
图3为本公开一些实施例提供的基站的结构示意图；
图4为本公开一些实施例提供的终端的结构示意图；
图5为本公开一些实施例提供的示例1的应用场景示意图；
图6为本公开一些实施例提供的示例2的应用场景示意图；
图7为本公开一些实施例提供的示例3的应用场景示意图；
图8为本公开一些实施例提供的示例4的应用场景示意图。
具体实施方式
为使本公开要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。在下面的描述中，提供诸如具体的配置和组件的特定细节仅仅是为了帮助全面理解本公开的实施例。因此，本领域技术人员应该清楚，可以对这里描述的实施例进行各种改变和修改而不脱离本公开的范围和精神。另外，为了清楚和简洁，省略了对已知功能和构造的描述。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本公开的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
在本公开的各种实施例中，应理解，下述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本公开实施例的实施过程构成任何限定。另外，本文中术语“系统”和“网络”在本文中常可互换使用。
本公开实施例中，基站的形式不限，可以是宏基站(Macro Base Station)、微基站(Pico Base Station)、Node B(3G移动基站的称呼)、增强型基站(eNB)、家庭增强型基站(Femto eNB或Home eNode B或Home eNB或HeNB)、中继站、 接入点、RRU(Remote Radio Unit，远端射频模块)、RRH(Remote Radio Head，射频拉远头)、5G移动通信系统中的网络侧节点，如中央单元(CU，Central Unit)和分布式单元(DU，Distributed Unit)等。终端可以是移动电话(或手机)，或者其他能够发送或接收无线信号的设备，包括用户设备(UE)、个人数字助理(PDA)、无线调制解调器、无线通信装置、手持装置、膝上型计算机、无绳电话、无线本地回路(WLL)站、能够将移动信号转换为WiFi信号的CPE(Customer Premise Equipment，客户终端)或移动智能热点、智能家电、或其他不通过人的操作就能自发与移动通信网络通信的设备等。
本公开一些实施例提供了一种移动通信系统中初始小区接入的方法，具体来说，提出了在物理随机接入信道(PRACH)流程中随机接入前导码(random-access preamble)的发送方案，可以适用于基站侧具备/不具备收发波束的互易性以及终端具备/不具备收发波束的互易性的各种情况，能够有效支持5G系统中基于多波束的初始小区接入。
请参照图1，本公开一些实施例提供的小区接入的方法，应用于基站侧时，包括以下步骤：
步骤11，基站确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设。
这里，本公开一些实施例的终端基于某个特定的收发互易性组合，在PRACH流程中进行随机接入前导码的发送。所述收发互易性组合具体包括基站是否具备收发波束互易性，以及终端是否具备收发波束互易性。
具体的，上述收发互易性组合可以是基站和终端双方事先配置的某种默认组合，此时，基站和终端具有相同的默认收发互易性组合，则在本步骤中，基站可以直接将该默认收发互易性组合，作为所述终端发送前导码所基于的收发互易性组合。
当然，本公开一些实施例中还可以由基站来指定终端采用的收发互易性组合。例如，在上述步骤11之前，基站可以广播发送第一指示信息，具体可以通过系统消息(如NR-PBCH和/或NR-SIB)或信令方式发送，该第一指示信息中包括有基站的收发波束互易性假设和终端的收发波束互易性假设。此时，基站可以根据预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合。
作为另外一种实现方式，终端可以自主选择其自身的收发波束互易性假设。此时，在上述步骤11之前，基站可以广播发送第二指示信息，具体可以通过系统消息(如NR-PBCH和/或NR-SIB)或信令方式发送，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设。后续，终端可以将终端自主选择的收发波束互易性假设的第三指示信息，通过显式发送或隐式发送方式，发送给基站。这样，基站可以基于第二指示信息和第三指示信息，确定所述终端发送前导码所基于的收发互易性组合。
上述显式发送的一种实现方式为：终端可以通过在前导码中携带相关指示信息的方式进行发送，此时需要对相关技术中的前导码进行扩展。
上述隐式发送的一种实现方式为：终端根据自主选择的收发波束互易性假设，确定所述终端的收发波束互易性假设所对应的第一前导码分组，并从第一前导码分组中选择本终端采用的前导码进行发送，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。这样，基站可以根据终端发送的前导码所属的第一前导码分组，确定第一前导码分组对应的收发波束互易性假设，得到所述终端的收发波束互易性假设。
步骤12，基站根据所述收发互易性组合，检测所述终端发送的前导码。
这里，基站可以确定所述收发互易性组合所对应的第一资源的位置，本公开一些实施例中，不同的收发互易性组合对应于预先定义的不同资源，且不同的收发互易性组合对应的资源具有不同的时频资源位置。这里，收发互易性组合所对应的资源，是预先定义好的。例如，以PSS所在的资源位置为参考，定义了若干具有不同时频资源位置的资源，每个资源分别对应于一种收发互易性组合。可以理解，通常需要定义4种资源，以对应可能存在的4种收发互易性组合。作为一种实现方式，每个资源(如第一资源)均包括有时域位置相同但频域位置不同的多组子资源，不同的子资源对应于预先定义的不同的下行最优波束，且所述终端在其中一种下行最优波束对应的子资源上发送前导码。所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束。作为一种实现方式，下行最优波束可以同时包括基站最优发送波束和终端最优接收波束。然后，基站在第一资源上，采用波束扫描的方式，通过基站的各个接收波束分别检测并接收终端发送的前导码。
步骤13，基站根据前导码所在资源的检测结果，确定上下行链路的最优收 发波束。
这里，针对上下行链路的各个最优收发波束，具体可以按照以下方式进行确定，其中：
基站最优发送波束，是基站根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据基站具备收发波束互易性的假设以及基站最优接收波束而确定的；
终端最优接收波束，是基站根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据终端具备收发波束互易性的假设以及终端最优发送波束而确定的；
基站最优接收波束，是基站根据接收信号质量最优的前导码所对应的基站接收波束而确定的，或者是根据基站具备收发波束互易性的假设以及基站最优发送波束而确定的；
终端最优发送波束，是基站根据接收信号质量最优的前导码所对应的终端接收波束而确定的，或者是根据终端具备收发波束互易性的假设以及终端最优接收波束而确定的。
较佳的，作为一种实现方式，当下行最优波束同时包括基站最优发送波束和终端最优接收波束，此时，在上述步骤13中，基站可以根据第一资源位置中检测到前导码的第一子资源，确定第一子资源对应的第一下行最优波束，从而得到下行链路的基站最优发送波束和终端最优接收波束。另外，基站还可以根据第一子资源上接收信号质量最优的前导码所对应的基站接收波束和终端发送波束，得到上行链路的基站最优接收波束和终端最优发送波束。
通过以上步骤，本公开一些实施例实现了初始小区接入过程中的最优波束的确定，可以适用于基站侧具备/不具备收发波束的互易性以及终端具备/不具备收发波束的互易性的各种情况，能够有效支持5G系统中基于多波束的初始小区接入。
以上步骤中，终端发送前导码时需要知道下行链路的基站最优发送波束和终端最优接收波束，为此，本公开一些实施例中，基站可以在上述步骤11之前，采用波束扫描的方式，通过基站的各个发送波束分别发送预定信息，所述预定信息包括同步信息(如PSS/SSS)、物理广播信道信息(PBCH)和系统消息(SIB)中的至少一种。这样，终端通过波束扫描方式接收上述预定信息，根 据接收结果，可以确定基站最优发送波束和终端最优接收波束。
以上步骤12中，所述收发互易性组合包括有4种不同的组合：
1)在所述收发互易性组合为基站和终端均不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的N组子资源，其中，N等于基站波束数量与终端波束数量的乘积。此时，所述终端在其中一种下行最优波束对应的子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。本文中，终端波束数量是指终端接收波束数量或终端发送波束数量，通常终端接收波束数量或终端发送波束数量是相等的。类似的，基站波束数量是指基站接收波束数量或基站发送波束数量，通常基站接收波束数量或基站发送波束数量是相等的。
2)在所述收发互易性组合为基站具备收发波束互易性但终端不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的M组子资源，其中，M等于终端波束数量，所述终端在其中一种下行最优波束对应的子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
3)在所述收发互易性组合为基站不具备收发波束互易性但终端具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的L组子资源，其中，L等于基站波束数量与终端波束数量的乘积，所述终端在其中一种下行最优波束对应的子资源上，通过该子资源对应的终端发送波束发送前导码。这里，该子资源对应的终端发送波束可以根据该子资源对应的下行最优波束所包括的终端最优接收波束的ID来确定的，例如，采用与终端最优接收波束的ID的终端发送波束进行发送。
4)在所述收发互易性组合为基站和终端均具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的P组子资源，其中，P等于终端波束数量，所述终端在其中一种下行最优波束对应的子资源上，通过该子资源对应的终端发送波束发送前导码。这里，该子资源对应的终端发送波束可以根据该子资源对应的下行最优波束所包括的终端最优接收波束的ID来确定的，例如，采用与终端最优接收波束的ID的终端发送波束进行发送。
以上从基站侧说明了本公开一些实施例的小区接入的方法，接下来将从终端侧进行说明。
请参照图2，本公开一些实施例提供的小区接入的方法，应用于终端侧时， 包括以下步骤：
步骤21，终端确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设。
与前述实施例对应的，作为一种实现方式，终端可以将预先配置的默认收发互易性组合，作为发送前导码所基于的收发互易性组合。
作为另一实现方式，终端可以根据基站预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合，所述第一指示信息包括有基站的收发波束互易性假设和终端的收发波束互易性假设。此时，在步骤21之前，终端还可能接收基站广播发送的第一指示信息。
作为又一种实现方式，终端可以根据基站预先发送的第二指示信息，确定基站的收发波束互易性假设，以及，终端自主选择所述终端的收发波束互易性假设，得到所述终端发送前导码所基于的收发互易性组合；其中，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设。此时，所述终端还可能确定所述终端的收发波束互易性假设所对应的第一前导码分组，从第一前导码分组中选择本终端采用的前导码，以用于后续步骤22中的发送，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。
步骤22，终端基于所述收发互易性组合，发送前导码。
这里，终端基于所述收发互易性组合，确定所述收发互易性组合所对应的第一资源的位置，其中，本公开一些实施例预先定义了不同的收发互易性组合对应于不同资源，这些不同资源具有不同的时频资源位置，每个资源，如第一资源，均包括有时域位置相同但频域位置不同的多组子资源，不同的子资源对应于预先定义的不同的下行最优波束，所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束。这样，终端根据预先确定的包括基站最优发送波束和/或终端最优接收波束的第一下行最优波束，确定所述第一资源中与所述第一下行最优波束对应的第一子资源的位置，然后终端在所述第一子资源上发送前导码。
以上步骤22中，终端需要预先知道下行链路的基站最优发送波束和终端最优接收波束的下行最优波束，作为一种实现方式，本公开一些实施例中终端可以接收基站发送的预定信息的方式来确定所述下行最优波束，具体的，终端 采用波束扫描的方式，通过终端的各个接收波束分别接收基站发送的预定信息，其中，所述预定信息是基站采用波束扫描的方式，通过基站的各个发送波束分别发送的，且所述预定信息包括同步信息、物理广播信道信息和系统消息中的至少一种，然后，终端根据所述预定信息的接收结果，确定基站最优发送波束和终端最优接收波束。
以上步骤22中，所述收发互易性组合包括有4种不同的组合：
1)在所述收发互易性组合为基站和终端均不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的N组子资源，其中，N等于基站波束数量与终端波束数量的乘积。此时，所述终端在所述第一子资源上发送前导码，具体为：终端在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
2)在所述收发互易性组合为基站具备收发波束互易性但终端不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的M组子资源，其中，M等于终端波束数量。此时，所述终端在所述第一子资源上发送前导码，具体为：所述终端在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
3)在所述收发互易性组合为基站不具备收发波束互易性但终端具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的L组子资源，其中，L等于基站波束数量与终端波束数量的乘积。此时，所述终端在所述第一子资源上发送前导码，具体为：所述终端在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
4)在所述收发互易性组合为基站和终端均具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的P组子资源，其中，P等于终端波束数量。此时，所述终端在所述第一子资源上发送前导码，具体为：所述终端在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
以上介绍了本公开一些实施例的小区接入方法，下面进一步接收实施上述方法的设备。请参照图3，本公开一些实施例提供了一种基站，包括：
第一确定单元31，用于确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设。
检测单元32，用于根据所述收发互易性组合，检测所述终端发送的前导码。
第二确定单元33，用于根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。
作为一种实现方式，所述第一确定单元，具体用于将预先配置的默认收发互易性组合，作为所述终端发送前导码所基于的收发互易性组合。
作为另一种实现方式，所述第一确定单元，具体用于：根据本基站预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合，所述第一指示信息包括有基站的收发波束互易性假设和终端的收发波束互易性假设。此时，所述基站还包括：第一发送单元，用于广播发送第一指示信息。
作为又一种实现方式，所述第一确定单元，具体用于：根据本基站预先发送的第二指示信息以及所述终端显式或隐式发送的第三指示信息，确定所述终端发送前导码所基于的收发互易性组合；其中，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设；所述第三指示信息包括有终端的收发波束互易性假设。此时，所述第一确定单元，还用于：根据终端发送的前导码所属的第一前导码分组，确定第一前导码分组对应的收发波束互易性假设，得到所述终端的收发波束互易性假设，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。
本公开一些实施例的上述基站还可以包括：
第二发送单元，用于采用波束扫描的方式，通过基站的各个发送波束分别发送预定信息，所述预定信息包括同步信息、物理广播信道信息和系统消息中的至少一种。
本公开一些实施例的上述基站中，所述检测单元包括：
第三确定单元，用于根据所述收发互易性组合，检测所述终端发送的前导码的步骤，包括：
第四确定单元，用于确定所述收发互易性组合所对应的第一资源的位置，其中，不同的收发互易性组合对应于预先定义的不同资源，且不同的收发互易性组合对应的资源具有不同的时频资源位置；
接收单元，用于在第一资源上，采用波束扫描的方式，通过基站的各个接收波束分别检测并接收终端发送的前导码；
其中，所述第一资源包括时域位置相同但频域位置不同的多组子资源，不 同的子资源对应于预先定义的不同的下行最优波束，且所述终端在其中一种下行最优波束对应的子资源上发送前导码，所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束。
这里，在所述收发互易性组合为基站和终端均不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的N组子资源，其中，N等于基站波束数量与终端波束数量的乘积，所述终端在其中一种下行最优波束对应的子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
在所述收发互易性组合为基站具备收发波束互易性但终端不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的M组子资源，其中，M等于终端波束数量，所述终端在其中一种下行最优波束对应的子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
在所述收发互易性组合为基站不具备收发波束互易性但终端具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的L组子资源，其中，L等于基站波束数量与终端波束数量的乘积，所述终端在其中一种下行最优波束对应的子资源上，通过该第一子资源对应的终端发送波束发送前导码。
在所述收发互易性组合为基站和终端均具备收发波束互易性时，所述第四确定单元，所述第一资源包括时域位置相同但频域位置不同的P组子资源，其中，P等于终端波束数量，所述终端在其中一种下行最优波束对应的子资源上，通过该第一子资源对应的终端发送波束发送前导码。
本公开一些实施例的上述基站中，所述第二确定单元，具体用于按照以下方式，确定上下行链路的最优收发波束：
基站最优发送波束，是根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据基站具备收发波束互易性的假设以及基站最优接收波束而确定的；
终端最优接收波束，是根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据终端具备收发波束互易性的假设以及终端最优发送波束而确定的；
基站最优接收波束，是根据接收信号质量最优的前导码所对应的基站接收波束而确定的，或者是根据基站具备收发波束互易性的假设以及基站最优发送波束而确定的；
终端最优发送波束，是根据接收信号质量最优的前导码所对应的终端接收波束而确定的，或者是根据终端具备收发波束互易性的假设以及终端最优接收波束而确定的。
例如，当下行最优波束同时包括基站最优发送波束和终端最优接收波束，此时，所述第二确定单元，可以用于根据第一资源位置中检测到前导码的第一子资源，确定第一子资源对应的第一下行最优波束，得到下行链路的基站最优发送波束和终端最优接收波束；根据接收信号质量最优的前导码所对应的基站接收波束和终端发送波束，得到上行链路的基站最优接收波束和终端最优发送波束。
请参照图4，本公开一些实施例提供了一种终端，包括：
第一确定单元41，用于确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设。
发送单元42，用于基于所述收发互易性组合，发送前导码。
作为一种实现方式，所述第一确定单元，具体用于：将预先配置的默认收发互易性组合，作为发送前导码所基于的收发互易性组合。
作为另一种实现方式，所述第一确定单元，具体用于：根据基站预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合，所述第一指示信息包括有基站的收发波束互易性假设和终端的收发波束互易性假设。此时所述的终端还包括：第一接收单元，用于接收基站广播发送的第一指示信息。
作为又一种实现方式，所述第一确定单元，具体用于：根据基站预先发送的第二指示信息，确定基站的收发波束互易性假设，以及，自主选择所述终端的收发波束互易性假设，得到所述终端发送前导码所基于的收发互易性组合；其中，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设。此时所述第一确定单元，还用于：确定所述终端的收发波束互易性假设所对应的第一前导码分组，从第一前导码分组中选择本终端采用的前导码，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。
以上终端中，还可以包括：
第二接收单元，用于采用波束扫描的方式，通过终端的各个接收波束分别 接收基站发送的预定信息，其中，所述预定信息是基站采用波束扫描的方式，通过基站的各个发送波束分别发送的，且所述预定信息包括同步信息、物理广播信道信息和系统消息中的至少一种；
第二确定单元，用于根据所述预定信息的接收结果，确定基站最优发送波束和终端最优接收波束。
以上终端中，所述发送单元包括：
第三确定单元，用于基于所述收发互易性组合，确定所述收发互易性组合所对应的第一资源的位置，其中，不同的收发互易性组合对应于预先定义的不同资源，且不同的收发互易性组合对应的资源具有不同的时频资源位置，所述第一资源包括时域位置相同但频域位置不同的多组子资源，不同的子资源对应于预先定义的不同的下行最优波束，所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束；
第四确定单元，用于根据预先确定的包括基站最优发送波束和/或终端最优接收波束的第一下行最优波束，确定所述第一资源中与所述第一下行最优波束对应的第一子资源的位置；
发送处理单元，用于在所述第一子资源上发送前导码。
这里，在所述收发互易性组合为基站和终端均不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的N组子资源，其中，N等于基站波束数量与终端波束数量的乘积。所述发送处理单元，具体用于：在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
在所述收发互易性组合为基站具备收发波束互易性但终端不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的M组子资源，其中，M等于终端波束数量。所述发送处理单元，具体用于：在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
在所述收发互易性组合为基站不具备收发波束互易性但终端具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的L组子资源，其中，L等于基站波束数量与终端波束数量的乘积。所述发送处理单元，具体用于：在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
在所述收发互易性组合为基站和终端均具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的P组子资源，其中，P等于终端波束 数量。所述发送处理单元，具体用于：在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
以上分别介绍了本公开一些实施例的小区接入方法及实施上述方法的基站和终端。接下来，进一步通过更为具体的示例，对本公开一些实施例以上方法的相关实现进行举例说明。下文中将发送波束简称为发波束，将接收波束简称为收波束。
示例1：
基站可以通过系统消息(如NR-PBCH和/或NR-SIB)或其他信令来指示终端，使得终端知道基于何种基站侧的收发波束互易性假设和何种终端的收发波束互易性假设来进行后续random-access preamble的发送。
基站指示终端如下信息，该信息包括1比特的第一字段和2比特的第二字段：
1)第一字段，用于指示基站侧的收发波束互易性假设，该第一字段的取值的一种实现方式如下：
“0”：表示基站侧具备收发波束互易性；
“1”：表示基站侧不具备收发波束互易性；
2)第二字段，用于指示终端的收发波束互易性假设，该第二字段的取值的一种实现方法如下：
“00”：表示终端具备收发波束互易性；
“01”：表示终端不具备收发波束互易性；
“10”：表示终端自主选择按照何种终端收发波束互易性假设进行后续random-access preamble的发送，并通过隐式或显式的方式告诉基站，终端后续发送random-access preamble的时候采用的何种假设。
例如，终端根据自己的实际情况选择合理的终端收发波束互易性假设进行后续random-access preamble的发送，并通过preamble来告诉基站自己的选择，如标准中预先对preamble分为两组，其中选择第一组的preamble意味着终端是基于终端具备收发波束互易性来进行preamble发送的，如果选择另一组则意味着终端是基于终端不具备收发波束互易性来进行preamble发送的。
“11”：保留。
通过以上方式，基站可以指示终端基于何种收发波束互易性的组合，来发 送前导码。
示例2：
图5提供了一种基于基站和终端都没有收发波束互易性的假设的情况下的随机接入前导码(random-access preamble)的发送。如图5所示，以基站侧有3个波束、终端有2个波束为例。
预先针对上述收发波束互易性的假设的组合，定义了图5所示的与该组合相对应的资源，即资源区域R1_TRP_Tx、R2_TRP_Tx、R3_TRP_Tx。
资源区域R1_TRP_Tx、R2_TRP_Tx、R3_TRP_Tx占用相同的时间资源，但是占用不同频率资源，它们每个都包括两个部分，分别是：资源区域R1_UE_Rx和R2_UE_Rx。资源区域R1_UE_Rx和R2_UE_Rx均为一个子资源，分别对应于一组特定的下行最优波束。
资源区域R1_UE_Rx和R2_UE_Rx，它们占用相同的时间资源，但是占用不同的频率资源，它们每个都包括两个部分，分别是：资源区域R1_UE_Tx和R2_UE_Tx。
资源区域R1_UE_Tx和R2_UE_Tx，它们占用相同的频率资源，但是占用不同的时间资源，它们每个又都包括三部分，分别是：资源区域R1_TRP_Rx、R2_TRP_Rx和R3_TRP_Rx，它们占用相同的频率资源，但是占用不同的时间资源。
图5中给出了各个资源块与收发波束之间的隐式指示关系。
在本示例中，基站首先采用波束扫描的方式，在其各个发送波束上发送PSS、SSS、PBCH和SIB中的至少一种信息。终端可以通过波束扫描的方式，接收上述信息，进而根据接收结果，确定包括下行链路的基站最优发送波束和终端最优接收波束的下行最优波束。
终端根据下行最优波束，确定一个与之对应的子资源，例如，资源区域R1_UE_Rx。然后，终端在资源区域R1_UE_Rx上以波束扫描的方式发送前导码，例如，在资源区域R1_UE_Rx中的前3个小矩形方块对应的资源上以发送波束1进行发送，在资源区域R1_UE_Rx中的后3个小矩形方块对应的资源上以发送波束2进行发送。
基站侧：基站根据收发波束互易性的假设的组合，确定与该组合相对应的资源，即资源区域R1_TRP_Tx、R2_TRP_Tx、R3_TRP_Tx。然后，基站在资源区 域R1_TRP_Tx、R2_TRP_Tx和R3_TRP_Tx上监视preamble，并以波束扫描的方式，通过本基站的各个接收波束，检测接收preamble。
●如果在R1_TRP_Tx上检测到preamble，则说明下行链路中最优的基站发波束为TRP_Tx_B1，具体的，
■如果在R1_UE_Rx上检测到preamble，则说明下行链路中最优的终端收波束为UE_Rx_B1，具体的，
◆如果在R1_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B1，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
◆如果在R2_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B2，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
■如果在R2_UE_Rx上检测到preamble，则说明下行链路中最优的终端收波束为UE_Rx_B2，具体的，
◆如果在R1_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B1，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的 preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
◆如果在R2_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B2，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
●如果在R2_TRP_Tx上检测到preamble，则说明下行链路中最优的基站发波束为TRP_Tx_B2，具体的，同理如上，可以确定下行链路中最优的终端收波束、上行链路中最优的终端发波束、上行链路中最优的基站收波束。
●如果在R3_TRP_Tx上检测到preamble，则说明下行链路中最优的基站发波束为TRP_Tx_B3，具体的，同理如上，可以确定下行链路中最优的终端收波束、上行链路中最优的终端发波束、上行链路中最优的基站收波束。
示例3：
图6提供了一种基于基站侧有收发波束互易性而终端没有收发波束互易性的假设的情况下的随机接入前导码(random-access preamble)的发送。如图6所示，仍然以基站侧有3个波束、终端有2个波束为例。
该场景下，不需要多个资源用于隐式指示下行链路中最优的基站发波束，只需要在一个默认的资源区域上监视preamble就行，该资源为基站和终端默认的或者标准预先定义好的。关于图6中各个资源的定义可以参考图5中类似的资源，此处不再赘述。
本示例中，基站在标准预先定义好的资源区域R_TRP_Tx上监视preamble，具体的，
■如果在R1_UE_Rx上检测到preamble，则说明下行链路中最优的终端收波束为UE_Rx_B1，具体的，
◆如果在R1_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B1，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
◆如果在R2_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B2，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
■如果在R2_UE_Rx上检测到preamble，则说明下行链路中最优的终端收波束为UE_Rx_B2，具体的，
◆如果在R1_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B1，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的 preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
◆如果在R2_UE_Tx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的终端发波束为UE_Tx_B2，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
●根据基站端收发波束的互易性，将上行链路中最优的基站收波束作为下行链路中最优的基站发波束。
示例4：
图7提供了一种基于基站侧没有收发波束互易性而终端有收发波束互易性的假设的情况下的随机接入前导码(random-access preamble)的发送。如图7所示，仍然以基站侧有3个波束、终端有2个波束为例。
该场景下，不需要多个资源用于隐式指示上行链路最优的终端发波束。关于图7中各个资源的定义可以参考图5中类似的资源，此处不再赘述。
示例4的方案描述：
●基站在资源区域R1_TRP_Tx、R2_TRP_Tx和R3_TRP_Tx上监视preamble，
■如果在R1_TRP_Tx上检测到preamble，则说明下行链路中最优的基站发波束为TRP_Tx_B1，具体的，
◆如果在R1_UE_Rx上检测到preamble，则说明下行链路中最优的终端收波束为UE_Rx_B1，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的 preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
◆如果在R2_UE_Rx上检测到preamble，则说明下行链路中最优的终端收波束为UE_Rx_B2，具体的，
●如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
●如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
●如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
■如果在R2_TRP_Tx上检测到preamble，则说明下行链路中最优的基站发波束为TRP_Tx_B2，具体的，同理如上，可以确定下行链路中最优的终端收波束、上行链路中最优的终端发波束、上行链路中最优的基站收波束。
■如果在R3_TRP_Tx上检测到preamble，则说明下行链路中最优的基站发波束为TRP_Tx_B3，具体的，同理如上，可以确定下行链路中最优的终端收波束、上行链路中最优的终端发波束、上行链路中最优的基站收波束。
●根据终端收发波束的互易性，将下行链路中最优的终端收波束作为上行链路中最优的终端发波束。
示例5：
图8提供了一种基于基站和终端都有收发波束互易性的假设的情况下的随机接入前导码(random-access preamble)的发送。如图8所示，仍然以基站侧有3个波束、终端有2个波束为例。
该场景下，不需要多个资源用于隐式指示下行链路中最优的基站发波束和上行链路最优的终端发波束。关于图8中各个资源的定义可以参考图5中类似的资源，此处不再赘述。
示例5的方案描述：
●基站在标准预先定义好的资源区域R_TRP_Tx上监视preamble，具体的，
■如果在R1_UE_Rx上检测到preamble，则说明下行链路中最优的 终端收波束为UE_Rx_B1，具体的，
◆如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
◆如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
◆如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
■如果在R2_UE_Rx上检测到preamble，则说明下行链路中最优的终端收波束为UE_Rx_B2，具体的，
◆如果在R1_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B1；
◆如果在R2_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B2；
◆如果在R3_TRP_Rx上检测到具有最优接收信号质量的preamble，则说明上行链路中最优的基站收波束为TRP_Rx_B3。
●根据将基站端收发波束的互易性，将上行链路中最优的基站收波束作为下行链路中最优的基站发波束；根据终端收发波束的互易性，将下行链路中最优的终端收波束作为上行链路中最优的终端发波束。
综上所述，本公开一些实施例提供的小区接入的方法、基站及终端，能够在PRACH流程中进行random-access preamble的发送，可以适用于基站侧具备/不具备收发波束的互易性以及终端具备/不具备收发波束的互易性的各种情况，能够有效支持5G系统中基于多波束的初始小区接入。
以上所述是本公开的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (50)

  1. 一种小区接入的方法，包括：
    基站确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    基站根据所述收发互易性组合，检测所述终端发送的前导码；
    基站根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。
  2. 如权利要求1所述的方法，其中，所述基站确定终端发送前导码所基于的收发互易性组合的步骤，包括：基站将预先配置的默认收发互易性组合，作为所述终端发送前导码所基于的收发互易性组合。
  3. 如权利要求1所述的方法，其中，所述基站确定终端发送前导码所基于的收发互易性组合的步骤，包括：根据本基站预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合，所述第一指示信息包括有基站的收发波束互易性假设和终端的收发波束互易性假设。
  4. 如权利要求3所述的方法，其中，在确定终端发送前导码所基于的收发互易性组合的步骤之前，还包括：基站广播发送第一指示信息。
  5. 如权利要求1所述的方法，其中，所述基站确定终端发送前导码所基于的收发互易性组合的步骤，包括：根据本基站预先发送的第二指示信息以及所述终端显式或隐式发送的第三指示信息，确定所述终端发送前导码所基于的收发互易性组合；其中，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设；所述第三指示信息包括有终端的收发波束互易性假设。
  6. 如权利要求5所述的方法，其中，所述基站确定终端发送前导码所基于的收发互易性组合的步骤，还包括：根据终端发送的前导码所属的第一前导码分组，确定第一前导码分组对应的收发波束互易性假设，得到所述终端的收发波束互易性假设，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。
  7. 如权利要求1至6任一项所述的方法，其中，在所述确定终端发送前导码所基于的收发互易性组合的步骤之前，所述方法还包括：
    基站采用波束扫描的方式，通过基站的各个发送波束分别发送预定信息，所述预定信息包括同步信息、物理广播信道信息和系统消息中的至少一种。
  8. 如权利要求1所述的方法，其中，所述基站根据所述收发互易性组合，检测所述终端发送的前导码的步骤，包括：
    基站确定所述收发互易性组合所对应的第一资源的位置，其中，不同的收发互易性组合对应于预先定义的不同资源，且不同的收发互易性组合对应的资源具有不同的时频资源位置；
    基站在第一资源上，采用波束扫描的方式，通过基站的各个接收波束分别检测并接收终端发送的前导码；
    其中，所述第一资源包括时域位置相同但频域位置不同的多组子资源，不同的子资源对应于预先定义的不同的下行最优波束，且所述终端在其中一种下行最优波束对应的子资源上发送前导码，所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束。
  9. 如权利要求8所述的方法，其中，在所述收发互易性组合为基站和终端均不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的N组子资源，其中，N等于基站波束数量与终端波束数量的乘积，所述终端在其中一种下行最优波束对应的子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
  10. 如权利要求8所述的方法，其中，在所述收发互易性组合为基站具备收发波束互易性但终端不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的M组子资源，其中，M等于终端波束数量，所述终端在其中一种下行最优波束对应的子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
  11. 如权利要求8所述的方法，其中，在所述收发互易性组合为基站不具备收发波束互易性但终端具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的L组子资源，其中，L等于基站波束数量与终端波束数量的乘积，所述终端在其中一种下行最优波束对应的子资源上，通过该子资源对应的终端发送波束发送前导码。
  12. 如权利要求8所述的方法，其中，在所述收发互易性组合为基站和终端均具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的P组子资源，其中，P等于终端波束数量，所述终端在其中一种下行最优波束对应的子资源上，通过该子资源对应的终端发送波束发送前导码。
  13. 如权利要求8所述的方法，其中，所述根据前导码所在资源的检测结果，确定上下行链路的最优收发波束的步骤，包括：
    基站最优发送波束，是基站根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据基站具备收发波束互易性的假设以及基站最优接收波束而确定的；
    终端最优接收波束，是基站根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据终端具备收发波束互易性的假设以及终端最优发送波束而确定的；
    基站最优接收波束，是基站根据接收信号质量最优的前导码所对应的基站接收波束而确定的，或者是根据基站具备收发波束互易性的假设以及基站最优发送波束而确定的；
    终端最优发送波束，是基站根据接收信号质量最优的前导码所对应的终端接收波束而确定的，或者是根据终端具备收发波束互易性的假设以及终端最优接收波束而确定的。
  14. 一种小区接入的方法，包括：
    终端确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    终端基于所述收发互易性组合，发送前导码。
  15. 如权利要求14所述的方法，其中，所述终端确定发送前导码所基于的收发互易性组合的步骤，包括：终端将预先配置的默认收发互易性组合，作为发送前导码所基于的收发互易性组合。
  16. 如权利要求14所述的方法，其中，所述终端确定发送前导码所基于的收发互易性组合的步骤，包括：终端根据基站预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合，所述第一指示信息包括有基站的收发波束互易性假设和终端的收发波束互易性假设。
  17. 如权利要求16所述的方法，其中，在确定发送前导码所基于的收发互易性组合的步骤之前，还包括：终端接收基站广播发送的第一指示信息。
  18. 如权利要求14所述的方法，其中，所述终端确定发送前导码所基于的收发互易性组合的步骤，包括：终端根据基站预先发送的第二指示信息，确定基站的收发波束互易性假设，以及，终端自主选择所述终端的收发波束互易 性假设，得到所述终端发送前导码所基于的收发互易性组合；其中，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设。
  19. 如权利要求18所述的方法，其中，所述终端确定发送前导码所基于的收发互易性组合的步骤，还包括：确定所述终端的收发波束互易性假设所对应的第一前导码分组，从第一前导码分组中选择本终端采用的前导码，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。
  20. 如权利要求14所述的方法，其中，在所述确定发送前导码所基于的收发互易性组合的步骤之前，所述方法还包括：
    终端采用波束扫描的方式，通过终端的各个接收波束分别接收基站发送的预定信息，其中，所述预定信息是基站采用波束扫描的方式，通过基站的各个发送波束分别发送的，且所述预定信息包括同步信息、物理广播信道信息和系统消息中的至少一种；
    终端根据所述预定信息的接收结果，确定基站最优发送波束和终端最优接收波束。
  21. 如权利要求14至20任一项所述的方法，其中，所述终端基于所述收发互易性组合，发送前导码的步骤，包括：
    终端基于所述收发互易性组合，确定所述收发互易性组合所对应的第一资源的位置，其中，不同的收发互易性组合对应于预先定义的不同资源，且不同的收发互易性组合对应的资源具有不同的时频资源位置，所述第一资源包括时域位置相同但频域位置不同的多组子资源，不同的子资源对应于预先定义的不同的下行最优波束，所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束；
    终端根据预先确定的包括基站最优发送波束和/或终端最优接收波束的第一下行最优波束，确定所述第一资源中与所述第一下行最优波束对应的第一子资源的位置；
    终端在所述第一子资源上发送前导码。
  22. 如权利要求21所述的方法，其中，在所述收发互易性组合为基站和终端均不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的N组子资源，其中，N等于基站波束数量与终端波束数量的乘积；所述 终端在所述第一子资源上发送前导码的步骤，包括：
    所述终端在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
  23. 如权利要求21所述的方法，其中，在所述收发互易性组合为基站具备收发波束互易性但终端不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的M组子资源，其中，M等于终端波束数量；所述终端在所述第一子资源上发送前导码的步骤，包括：
    所述终端在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
  24. 如权利要求21所述的方法，其中，在所述收发互易性组合为基站不具备收发波束互易性但终端具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的L组子资源，其中，L等于基站波束数量与终端波束数量的乘积；所述终端在所述第一子资源上发送前导码的步骤，包括：
    所述终端在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
  25. 如权利要求21所述的方法，其中，在所述收发互易性组合为基站和终端均具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的P组子资源，其中，P等于终端波束数量；所述终端在所述第一子资源上发送前导码的步骤，包括：
    所述终端在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
  26. 一种基站，包括：
    第一确定单元，用于确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    检测单元，用于根据所述收发互易性组合，检测所述终端发送的前导码；
    第二确定单元，用于根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。
  27. 如权利要求26所述的基站，其中，所述第一确定单元，具体用于将预先配置的默认收发互易性组合，作为所述终端发送前导码所基于的收发互易 性组合。
  28. 如权利要求26所述的基站，其中，所述第一确定单元，具体用于：根据本基站预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合，所述第一指示信息包括有基站的收发波束互易性假设和终端的收发波束互易性假设。
  29. 如权利要求28所述的基站，还包括：
    第一发送单元，用于广播发送第一指示信息。
  30. 如权利要求26所述的基站，其中，所述第一确定单元，具体用于：根据本基站预先发送的第二指示信息以及所述终端显式或隐式发送的第三指示信息，确定所述终端发送前导码所基于的收发互易性组合；其中，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设；所述第三指示信息包括有终端的收发波束互易性假设。
  31. 如权利要求30所述的基站，其中，所述第一确定单元，还用于：根据终端发送的前导码所属的第一前导码分组，确定第一前导码分组对应的收发波束互易性假设，得到所述终端的收发波束互易性假设，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。
  32. 如权利要求26至30任一项所述的基站，还包括：
    第二发送单元，用于采用波束扫描的方式，通过基站的各个发送波束分别发送预定信息，所述预定信息包括同步信息、物理广播信道信息和系统消息中的至少一种。
  33. 如权利要求26所述的基站，其中，所述检测单元包括：
    第三确定单元，用于根据所述收发互易性组合，检测所述终端发送的前导码的步骤，包括：
    第四确定单元，用于确定所述收发互易性组合所对应的第一资源的位置，其中，不同的收发互易性组合对应于预先定义的不同资源，且不同的收发互易性组合对应的资源具有不同的时频资源位置；
    接收单元，用于在第一资源上，采用波束扫描的方式，通过基站的各个接收波束分别检测并接收终端发送的前导码；
    其中，所述第一资源包括时域位置相同但频域位置不同的多组子资源，不同的子资源对应于预先定义的不同的下行最优波束，且所述终端在其中一种下 行最优波束对应的子资源上发送前导码，所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束。
  34. 如权利要求33所述的基站，其中，所述第二确定单元，具体用于按照以下方式，确定上下行链路的最优收发波束：
    基站最优发送波束，是根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据基站具备收发波束互易性的假设以及基站最优接收波束而确定的；
    终端最优接收波束，是根据检测到前导码的第一子资源所对应的第一下行最优波束得到的，或者是根据终端具备收发波束互易性的假设以及终端最优发送波束而确定的；
    基站最优接收波束，是根据接收信号质量最优的前导码所对应的基站接收波束而确定的，或者是根据基站具备收发波束互易性的假设以及基站最优发送波束而确定的；
    终端最优发送波束，是根据接收信号质量最优的前导码所对应的终端接收波束而确定的，或者是根据终端具备收发波束互易性的假设以及终端最优接收波束而确定的。
  35. 一种终端，包括：
    第一确定单元，用于确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    发送单元，用于基于所述收发互易性组合，发送前导码。
  36. 如权利要求35所述的终端，其中，所述第一确定单元，具体用于：将预先配置的默认收发互易性组合，作为发送前导码所基于的收发互易性组合。
  37. 如权利要求35所述的终端，其中，所述第一确定单元，具体用于：根据基站预先发送的第一指示信息，确定所述终端发送前导码所基于的收发互易性组合，所述第一指示信息包括有基站的收发波束互易性假设和终端的收发波束互易性假设。
  38. 如权利要求37所述的终端，还包括：
    第一接收单元，用于接收基站广播发送的第一指示信息。
  39. 如权利要求35所述的终端，其中，所述第一确定单元，具体用于：根据基站预先发送的第二指示信息，确定基站的收发波束互易性假设，以及， 自主选择所述终端的收发波束互易性假设，得到所述终端发送前导码所基于的收发互易性组合；其中，所述第二指示信息包括有基站的收发波束互易性假设，并指示终端自主选择终端的收发波束互易性假设。
  40. 如权利要求39所述的终端，其中，所述第一确定单元，还用于：确定所述终端的收发波束互易性假设所对应的第一前导码分组，从第一前导码分组中选择本终端采用的前导码，其中，不同的前导码分组对应于终端的不同收发波束互易性假设。
  41. 如权利要求35所述的终端，还包括：
    第二接收单元，用于采用波束扫描的方式，通过终端的各个接收波束分别接收基站发送的预定信息，其中，所述预定信息是基站采用波束扫描的方式，通过基站的各个发送波束分别发送的，且所述预定信息包括同步信息、物理广播信道信息和系统消息中的至少一种；
    第二确定单元，用于根据所述预定信息的接收结果，确定基站最优发送波束和终端最优接收波束。
  42. 如权利要求35至41任一项所述的终端，其中，所述发送单元包括：
    第三确定单元，用于基于所述收发互易性组合，确定所述收发互易性组合所对应的第一资源的位置，其中，不同的收发互易性组合对应于预先定义的不同资源，且不同的收发互易性组合对应的资源具有不同的时频资源位置，所述第一资源包括时域位置相同但频域位置不同的多组子资源，不同的子资源对应于预先定义的不同的下行最优波束，所述下行最优波束包括下行链路的基站最优发送波束和/或终端最优接收波束；
    第四确定单元，用于根据预先确定的包括基站最优发送波束和/或终端最优接收波束的第一下行最优波束，确定所述第一资源中与所述第一下行最优波束对应的第一子资源的位置；
    发送处理单元，用于在所述第一子资源上发送前导码。
  43. 如权利要求42所述的终端，其中，在所述收发互易性组合为基站和终端均不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的N组子资源，其中，N等于基站波束数量与终端波束数量的乘积；
    所述发送处理单元，具体用于：在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
  44. 如权利要求42所述的终端，其中，在所述收发互易性组合为基站具备收发波束互易性但终端不具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的M组子资源，其中，M等于终端波束数量；
    所述发送处理单元，具体用于：在第一子资源上采用波束扫描的方式，通过终端的各个发送波束分别发送前导码。
  45. 如权利要求42所述的终端，其中，在所述收发互易性组合为基站不具备收发波束互易性但终端具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的L组子资源，其中，L等于基站波束数量与终端波束数量的乘积；
    所述发送处理单元，具体用于：在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
  46. 如权利要求42所述的终端，其中，在所述收发互易性组合为基站和终端均具备收发波束互易性时，所述第一资源包括时域位置相同但频域位置不同的P组子资源，其中，P等于终端波束数量；
    所述发送处理单元，具体用于：在第一子资源上，通过该第一子资源对应的终端发送波束发送前导码。
  47. 一种基站，包括处理器、收发机和存储器；
    其中，所述处理器用于读取所述存储器中的程序，执行下列过程：
    确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    根据所述收发互易性组合，检测所述终端发送的前导码；
    根据前导码所在资源的检测结果，确定上下行链路的最优收发波束；
    所述收发机用于接收和发送数据；
    所述存储器用于保存所述处理器执行操作时所使用的数据。
  48. 一种终端，包括处理器、收发机和存储器；
    其中，所述处理器用于读取所述存储器中的程序，执行下列过程：
    确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    基于所述收发互易性组合，发送前导码；
    所述收发机用于接收和发送数据；
    所述存储器用于保存所述处理器执行操作时所使用的数据。
  49. 一种非易失性计算机可读存储介质，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器执行以下操作：
    确定终端发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    根据所述收发互易性组合，检测所述终端发送的前导码；
    根据前导码所在资源的检测结果，确定上下行链路的最优收发波束。
  50. 一种非易失性计算机可读存储介质，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器执行以下操作：
    确定发送前导码所基于的收发互易性组合，所述收发互易性组合包括基站的收发波束互易性假设和终端的收发波束互易性假设；
    基于所述收发互易性组合，发送前导码。
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