WO2017049894A1 - 一种随机接入方法、装置及系统 - Google Patents

一种随机接入方法、装置及系统 Download PDF

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Publication number
WO2017049894A1
WO2017049894A1 PCT/CN2016/079065 CN2016079065W WO2017049894A1 WO 2017049894 A1 WO2017049894 A1 WO 2017049894A1 CN 2016079065 W CN2016079065 W CN 2016079065W WO 2017049894 A1 WO2017049894 A1 WO 2017049894A1
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Prior art keywords
real
ultra
prach
time service
dedicated
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PCT/CN2016/079065
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English (en)
French (fr)
Inventor
刘旭
戴谦
艾建勋
邹伟
Original Assignee
中兴通讯股份有限公司
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Priority to US15/761,793 priority Critical patent/US10638518B2/en
Publication of WO2017049894A1 publication Critical patent/WO2017049894A1/zh

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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
    • H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
    • 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
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • 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

Definitions

  • This document relates to wireless communication technologies, and in particular, to a random access method, apparatus and system.
  • the LTE-Advanced technology standard is mainly formulated by the International Organization for Standardization of the 3rd Generation Partnership Project (3GPP).
  • 3GPP 3rd Generation Partnership Project
  • MTC Machine Type Communication
  • massive connections low power consumption, low latency, and high reliability.
  • the huge number of connections is reflected in the number of MTC devices is more than 10 times that of human-to-human communication terminals; low energy consumption is reflected in the fact that MTC terminals have a huge amount of features, so the significance of energy saving is extraordinary; low latency and high reliability are reflected in
  • the MTC device has an end-to-end delay of 1 millisecond or less.
  • MTC equipment often needs to transmit ultra-real-time business data, so that the data processing center can analyze and process the business data in time or make corresponding actions; therefore, research on ultra-real-time services and delay will become an important technology in the MTC research process. point.
  • Mode 1 physical downlink control channel (PDCCH, Physical Downlink) Control Channel) triggering; mode 2, media access control layer (MAC, Media Access Control) trigger; mode 3, upper layer trigger.
  • PDCCH Physical Downlink control channel
  • MAC media access control layer
  • mode 3 upper layer trigger.
  • RRC Radio Resource Control
  • the user when the user has uplink data to be sent, and the user is in an out-of-synchronization state or does not have a physical uplink control channel (PUCCH, Physical Uplink Control Channel) resource for sending a scheduling request (SR), at this time,
  • PUCCH Physical Uplink Control Channel
  • SR scheduling request
  • the user will be triggered to initiate an RRC connection reconfiguration process.
  • the random access procedure triggered by the upper layer includes initial random access, RRC connection reestablishment, and handover.
  • TTI Transmission Time Interval
  • short TTI Transmission Time Interval
  • the related art does not provide a scheme for triggering a base station to allocate short TTI resources for a user equipment of a super real-time service and perform signaling interaction with a user equipment by using a short TTI resource in a random access procedure.
  • the embodiment of the present invention provides a random access method, device, and system, which can implement a user equipment with ultra-real-time service and short transmission time interval (TTI) support capability to trigger a base station to allocate a short TTI to a user equipment in a random access procedure. Resources.
  • TTI transmission time interval
  • the embodiment of the invention provides a random access method, including:
  • the user equipment receives the configuration information of the physical random access channel (PRACH) dedicated to the ultra-real time service and the configuration information of the preamble dedicated to the ultra real-time service notified by the base station; when the user equipment has the ultra real-time service and has the short TTI
  • the user equipment sends the preamble sequence to the base station through the PRACH resource dedicated to the ultra-real-time service according to the configuration information of the PRACH dedicated to the ultra-real-time service and/or the configuration information of the preamble sequence dedicated to the ultra-real-time service, or transmits the ultra-real-time service.
  • a dedicated preamble sequence is sent to the base station to trigger the base station to allocate short TTI resources for the user equipment.
  • the embodiment of the present invention further provides a random access method, including: the base station identifies the preamble sequence sent by the user equipment; when the base station recognizes that the received preamble sequence is sent by the user equipment through the PRACH resource dedicated to the ultra real-time service, or When the preamble sequence is dedicated to the ultra-real time service, the base station sends a random access response (RAR) carrying the short TTI resource allocation information to the user equipment.
  • a random access response including: the base station identifies the preamble sequence sent by the user equipment; when the base station recognizes that the received preamble sequence is sent by the user equipment through the PRACH resource dedicated to the ultra real-time service, or When the preamble sequence is dedicated to the ultra-real time service, the base station sends a random access response (RAR) carrying the short TTI resource allocation information to the user equipment.
  • RAR random access response
  • the embodiment of the present invention further provides a random access device, which is disposed on the user equipment, and includes: a first receiving module, configured to receive configuration information of the PRACH dedicated to the ultra-real time service and/or a preamble dedicated to the ultra-real time service, which is notified by the base station.
  • a random access device which is disposed on the user equipment, and includes: a first receiving module, configured to receive configuration information of the PRACH dedicated to the ultra-real time service and/or a preamble dedicated to the ultra-real time service, which is notified by the base station.
  • the first sending module is configured to: when the user equipment has ultra-real-time services and has short TTI support capability, according to the configuration information of the PRACH dedicated to the ultra-real-time service and/or the configuration information of the preamble sequence dedicated to the ultra-real-time service,
  • the preamble sequence is sent to the base station by using the PRACH resource dedicated to the real-time service, or the preamble sequence dedicated to the ultra-real-time service is sent to the base station to trigger the base station to allocate the short TTI resource to the user equipment.
  • the embodiment of the present invention further provides a random access device, which is disposed at the base station, and includes: a second receiving module, configured to identify a preamble sequence sent by the user equipment; and a second sending module, configured to be recognized by the second receiving module
  • the received preamble sequence is an RAR that carries short TTI resource allocation information to the user equipment when the user equipment transmits the PRACH resource dedicated to the ultra real-time service or is a preamble sequence dedicated to the ultra-real time service.
  • the embodiment of the present invention further provides a random access system, including: a user equipment and a base station; and a user equipment, configured to receive configuration information of a PRACH dedicated to real-time services and/or a configuration of a preamble sequence dedicated to an ultra-real-time service.
  • Information when the user equipment has ultra-real-time services and has short TTI support capability, the user equipment passes the PRACH dedicated to the ultra-real-time service according to the configuration information of the PRACH dedicated to the ultra-real-time service and/or the configuration information of the preamble sequence dedicated to the ultra-real-time service.
  • the resource sends a preamble sequence to the base station, or sends a preamble sequence dedicated to the ultra real-time service to the base station; the base station identifies the preamble sequence sent by the user equipment; when the base station recognizes that the received preamble sequence is dedicated by the user equipment through the ultra real-time service
  • the base station sends the RAR carrying the short TTI resource allocation information to the user equipment.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the above method.
  • the user equipment receives the PRACH dedicated to the ultra-real time service notified by the base station.
  • Configuration information and/or configuration information of a preamble sequence dedicated to ultra-real-time services when the user equipment has ultra-real-time services and has short TTI support capability, the user equipment is configured according to the PRACH configuration information and/or ultra-real-time service dedicated to the ultra-real-time service.
  • the configuration information of the dedicated preamble sequence is sent to the base station by using the PRACH resource dedicated to the real-time service, or the preamble sequence dedicated to the ultra-real-time service is sent to the base station to trigger the base station to allocate the short TTI resource to the user equipment.
  • the ultra-real-time service-specific may be selected in the process of initiating random access.
  • the preamble dedicated to the PRACH or the ultra-real-time service triggers the base station to use the short TTI resource in the next signaling interaction, and allocates the short TTI resource to the user equipment, thereby effectively reducing the user plane and the control plane delay to meet The need for delay in user ultra-real-time services.
  • FIG. 1 is a schematic diagram of PRACH time-frequency resource configuration in an LTE system
  • 3a-3d are schematic diagrams of configuring PRACH time-frequency resources dedicated to ultra-real-time services according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a MAC PDU of an RAR according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a random access procedure according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of another random access method according to an embodiment of the present invention.
  • FIG. 7 is a block diagram of a component of a random access device installed in a user equipment according to an embodiment of the present disclosure
  • FIG. 8 is a schematic structural diagram of a random access device installed in a base station according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a random access method according to an embodiment of the present invention. As shown in FIG. 2, the random access method provided in this embodiment includes the following steps:
  • Step 11 The user equipment receives the configuration information of the physical random access channel (PRACH) dedicated to the ultra-real time service and the configuration information of the preamble dedicated to the ultra real-time service notified by the base station.
  • PRACH physical random access channel
  • the configuration information of the PRACH dedicated to the ultra real-time service includes any one of the following:
  • the PRACH dedicated to the ultra-real-time service and the existing PRACH occupy the same TTI with a time domain position of 1 millisecond, the frequency domain resource location is different, and the frame structure of the PRACH dedicated to the ultra-real time service is a TTI of 1 millisecond;
  • the PRACH dedicated to the ultra-real-time service and the existing PRACH occupy the same TTI with a time domain position of 1 millisecond, the frequency domain resource location is different, and the frame structure of the PRACH dedicated to the ultra-real time service is a short TTI less than 1 millisecond;
  • the PRACH dedicated to the ultra-real-time service occupies a different time domain location than the existing PRACH, and the frame structure of the PRACH dedicated to the ultra-real-time service is a TTI of 1 millisecond;
  • the PRACH dedicated to the ultra-real-time service occupies a different time domain location than the existing PRACH, and the frame structure of the PRACH dedicated to the ultra-real-time service is a short TTI of less than 1 millisecond.
  • the configuration information of the preamble sequence dedicated to the ultra real-time service includes: an index of a preamble sequence dedicated to the ultra real-time service in the existing preamble sequence for random access.
  • the ultra-real-time service refers to a service whose service indicator is a packet delay of less than 50 milliseconds.
  • a QoS class identifier QCI
  • PCEF Policy and Charging Enforcement Function
  • Step 12 When the user equipment has ultra-real-time services and has short TTI support capability, the user equipment is dedicated to the ultra-real-time service according to the configuration information of the PRACH dedicated to the ultra-real-time service and/or the configuration information of the pre-order sequence dedicated to the ultra-real-time service.
  • the PRACH resource sends a preamble sequence to the base station, or sends a preamble sequence dedicated to the ultra-real time service to the base station to trigger the base station to allocate short TTI resources for the user equipment.
  • the embodiment of the present invention further provides a random access method.
  • the method includes: the base station identifies the preamble sequence sent by the user equipment; and when the base station recognizes that the received preamble sequence is used by the user equipment through the ultra real-time service.
  • the base station sends a random access response (RAR, Random Access Response) carrying the short TTI resource allocation information to the user equipment.
  • RAR Random Access Response
  • the short TTI resource allocation information is uplink grant information of a short TTI carried by a MAC RAR control information element in a Media Access Control Protocol Data Unit (MAC PDU) of the RAR.
  • MAC PDU Media Access Control Protocol Data Unit
  • the method further includes: determining, by the base station, the resource for sending the RAR according to the short TTI support capability of all user equipments that initiate the random access request.
  • the user equipment that initiates the random access request at a time does not all have the short TTI support capability, or the physical downlink shared channel (PDSCH) resource for transmitting the RAR has no short TTI resource, and the base station The RAR is sent on the PDSCH resource with the TTI length of 1 millisecond.
  • PDSCH physical downlink shared channel
  • the user equipments that initiate the random access request at a time all have the short TTI support capability, and the PDSCH resources used for transmitting the RAR at this time have short TTI resources, and the base station is at the TTI length.
  • the RAR is transmitted on the PDSCH resource of less than 1 millisecond.
  • FIG. 1 is a schematic diagram of configuration of PRACH time-frequency resources in an LTE system.
  • the S-PRACH and the existing PRACH occupy the same TTI with a time domain position of 1 millisecond, the frequency domain resource location is different, and the frame structure of the S-PRACH is also a TTI of 1 millisecond.
  • a random access Radio Network Temporary Identifier
  • RA-RNTI 1+t-id+10*f-id
  • t_id represents the first subframe number in which the PRACH of the preamble is transmitted
  • f_id represents the sub-frame number
  • the frame sends the index of the PRACH of the preamble in the frequency domain.
  • FDD frequency division duplex
  • embodiments of the present invention are not limited to such a calculation method, as long as other methods of distinguishing the time-frequency resources of the PRACH and the S-PRACH in the value range may be used.
  • the S-PRACH and the existing PRACH occupy the same TTI with a time domain position of 1 millisecond, the frequency domain resource location is different, and the frame structure of the S-PRACH is a short TTI less than 1 millisecond. That is, in a PRACH time domain with a TTI length of 1 millisecond, the S-PRACH has multiple short TTI resources as a time domain resource of the S-PRACH.
  • the S-PRACH time-frequency resource locations need to be distinguished, but also the S-PRACH time-frequency resource location on the short TTI in the 1 millisecond subframe (ie, the S-PRACH is used to send the preamble).
  • the shadow is short TTI time-frequency position, as shown in Figure 3b).
  • the t_id indicates the first subframe number of the PRACH that sends the preamble
  • the f_id indicates the index of the PRACH in the frequency domain in which the preamble is transmitted
  • the st-id indicates the subframe number of the S-PRACH used to transmit the preamble.
  • embodiments of the present invention are not limited to such a calculation method as long as other calculation methods capable of distinguishing between PRACH and S-PRACH resources in the range of values can be used.
  • the S-PRACH and the existing PRACH occupy different time domain locations, and the frame structure of the S-PRACH is a TTI of 1 millisecond.
  • f_id indicates sending The index of the PRACH of the preamble in the frequency domain
  • the st-id represents the subframe number of the S-PRACH used to transmit the preamble.
  • embodiments of the present invention are not limited to such a calculation method as long as other calculation methods capable of distinguishing between PRACH and S-PRACH resources in the range of values can be used.
  • the S-PRACH and the existing PRACH occupy different time domain locations
  • the frame structure of S-PRACH is a short TTI of less than 1 millisecond. Multiple short TTIs in 1 millisecond time may be used in part or in full as the time domain resources of the S-PRACH.
  • t_id represents the first subframe number in which the PRACH of the preamble is transmitted
  • f_id represents the index of the PRACH in the frequency domain in which the preamble is transmitted
  • st-id represents the subframe of the S-PRACH used to transmit the preamble. number.
  • embodiments of the present invention are not limited to such a calculation method as long as other calculation methods capable of distinguishing between PRACH and S-PRACH resources in the range of values can be used.
  • the base station adds the configuration information of the S-PRACH to the system information block 2 (SIB-2, System Information Block-2), and notifies all user equipments in the cell by broadcasting.
  • SIB-2 System Information Block-2
  • This embodiment describes a method for dividing a preamble in an existing preamble for mapping a super real-time service.
  • a preamble for random access is carried on the PRACH.
  • the base station can obtain the service feature information of the user equipment, so that the base station can allocate the uplink grant resource reasonably, and divide the preamble for the random access in the existing one cell into a part of the preamble. Used to map ultra-real time services.
  • the system determines, according to a ratio of the number of user equipments with ultra-real-time services and short TTI support capabilities in the cell to the total number of user equipments, the proportion of preambles that map the ultra-real-time services.
  • the base station adds configuration information of the preamble dedicated to the ultra real-time service to the system information block 2 (SIB-2, System Information Block-2), and notifies all user equipments in the cell by broadcasting.
  • the configuration information of the preamble dedicated to the ultra-real-time service includes: an index of a preamble dedicated to the ultra-real-time service in the existing preamble for random access, for example, dividing in 64 preambles for random access in an existing cell. An index of the preamble used to map the ultra-real time service.
  • the base station after the base station receives the preamble sent by the user equipment, the base station sends a random access response (RAR, Random Access Response) to specifically describe the manner.
  • RAR Random Access Response
  • the manner in which the base station sends a random access response includes one of the following:
  • the base station sends the RAR to the user equipment on the subframe resource with the TTI length of 1 millisecond.
  • the base station sends the RAR to the user equipment on the subframe resource with the TTI length of 1 millisecond.
  • the user equipments that initiate the random access request at one time have the short TTI support capability, or the time is used to send the RAR.
  • the physical downlink shared channel (PDSCH) resource has no short TTI resource, and the base station will send the RAR on the subframe resource with the TTI length of 1 millisecond.
  • PDSCH physical downlink shared channel
  • the base station sends the RAR to the user equipment on the subframe resource whose TTI length is less than 1 millisecond.
  • all the user equipments that initiate the random access request at one time have the short TTI support capability, and the time is used to send the PDSCH of the RAR. If the resource has a short TTI resource, the base station will send the RAR on the subframe resource whose TTI length is less than 1 millisecond.
  • the MAC RAR control information unit in the RAR MAC PDU sent by the base station carries the uplink grant information of the short TTI.
  • the schematic diagram of the composition of the RAR MAC PDU in the embodiment of the present invention is shown in FIG. 4 .
  • FIG. 5 is a schematic diagram of a random access procedure according to an embodiment of the present invention. As shown in FIG. 5, this embodiment is specifically described as follows:
  • Step 501 When the user equipment initiates random access, select a suitable PRACH resource for sending a preamble (such as S-PRACH or a normal PRACH) or select a suitable preamble (such as a preamble or non-super real-time service dedicated for ultra-real time services). Preamble) completes sending the preamble to the base station;
  • a preamble such as S-PRACH or a normal PRACH
  • a suitable preamble such as a preamble or non-super real-time service dedicated for ultra-real time services.
  • Preamble completes sending the preamble to the base station;
  • Step 502 The base station determines, according to the support capability of the TTI that all the user equipments that initiate the random access request at the moment, select the PDSCH resource with the TTI length of 1 millisecond to send the RAR or the PDSCH resource with the TTI length less than 1 millisecond to send the RAR.
  • a real-time service-specific S-PRACH or preamble user equipment, the base station will carry the short TTI uplink grant information in its MAC RAR control information unit;
  • the user equipment detects whether there is a corresponding RA-RNTI on the physical downlink control channel (PDCCH, Physical Downlink Control Channel); if yes, according to the indication on the PDCCH. Reading the RAR message on the PDSCH;
  • PDCCH Physical Downlink Control Channel
  • Step 503 Since in step 501, a plurality of user equipments may select the same random access resource to complete the transmission of the preamble; that is, a collision occurs, in order to resolve the conflict, the user equipment needs to send the RRC connection setup message by using the resource allocated in step 502. And carrying the identification (ID) of the user equipment;
  • Step 504 The base station sends a contention resolution message, if the ID for contention cancellation included in the control message of the MAC PDU matches the ID for contention cancellation sent by the user equipment, the contention is successful; if the user equipment selects the super device in step 501 Real-time service-specific S-PRACH or dedicated preamble, then the base station can select short TTI resources to transmit this message to reduce the signaling transmission delay.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the above method.
  • the embodiment of the present invention further provides a random access device, which is disposed on the user equipment, as shown in FIG. 7, and includes:
  • a first receiving module configured to receive configuration information of a PRACH dedicated to the ultra-real time service and/or configuration information of a preamble sequence dedicated to the ultra real-time service, which is notified by the base station;
  • a first sending module configured to: when the user equipment has an ultra-real-time service and has a short TTI support capability, according to the configuration information of the PRACH dedicated to the ultra-real-time service and/or the configuration information of the preamble sequence dedicated to the ultra-real-time service,
  • the preamble sequence is sent to the base station by using the PRACH resource dedicated to the real-time service, or the preamble sequence dedicated to the ultra-real-time service is sent to the base station, so that the base station is triggered to allocate the short TTI resource to the user equipment.
  • the configuration information of the PRACH dedicated to the ultra real-time service includes any one of the following:
  • the PRACH dedicated to the ultra-real-time service and the existing PRACH occupy the same TTI with a time domain position of 1 millisecond, the frequency domain resource location is different, and the frame structure of the PRACH dedicated to the ultra-real time service is a TTI of 1 millisecond;
  • the PRACH dedicated to the ultra-real-time service and the existing PRACH occupy the same TTI with a time domain position of 1 millisecond, the frequency domain resource location is different, and the frame structure of the PRACH dedicated to the ultra-real time service is a short TTI less than 1 millisecond;
  • the PRACH dedicated to the ultra-real-time service occupies a different time domain location than the existing PRACH, and the frame structure of the PRACH dedicated to the ultra-real-time service is a TTI of 1 millisecond;
  • the PRACH dedicated to the ultra-real-time service occupies a different time domain location than the existing PRACH, and the frame structure of the PRACH dedicated to the ultra-real-time service is a short TTI of less than 1 millisecond.
  • the configuration information of the super-real-time service-specific preamble sequence includes: an index of a super-real-time service-specific preamble sequence in a preamble sequence existing for random access.
  • the ultra-real-time service refers to a service whose service indicator is a packet delay of less than 50 milliseconds.
  • an embodiment of the present invention further provides a random access device, which is disposed at a base station, as shown in FIG.
  • a second receiving module configured to identify a preamble sequence sent by the user equipment
  • a second sending module configured to: when the second receiving module detects that the received preamble sequence is sent by the user equipment through a PRACH resource dedicated to the ultra real-time service or is a preamble sequence dedicated to the ultra-real time service, sending the sequence to the user equipment RAR carrying short TTI resource allocation information.
  • the short TTI resource allocation information is uplink grant information of a short TTI carried by a MAC RAR control information element in a MAC PDU of the RAR.
  • the second sending module is further configured to: determine, according to the short TTI support capability of all user equipments that initiate the random access request, the resource that sends the RAR.
  • the RAR is sent on the PDSCH resource with the TTI length of 1 millisecond.
  • the user equipments that initiate the random access request at a time all have short TTI support capability, and the PDSCH resources used for transmitting the RAR at this time have short TTI resources, and the RAR is transmitted on the PDSCH resources whose TTI length is less than 1 millisecond.
  • the first receiving module and the second receiving module are, for example, a communication component having a receiving capability such as a receiver, and the first sending module and the second sending module are, for example, a transmitter and the like. Communication component of the transmission capability.
  • the invention is not limited thereto.
  • the above modules are, for example, a combination of software and/or hardware that can implement predetermined functions.
  • an embodiment of the present invention further provides a random access system, including: a user equipment and a base station;
  • the user equipment is configured to receive configuration information of a PRACH dedicated to the ultra-real-time service and/or configuration information of a preamble sequence dedicated to the ultra-real-time service notified by the base station; when the user equipment has an ultra-real-time service and has a short TTI support capability And the user equipment sends the preamble sequence to the base station by using the PRACH resource dedicated to the ultra real-time service according to the configuration information of the PRACH dedicated to the ultra-real-time service and/or the configuration information of the preamble sequence dedicated to the ultra-real-time service, or sends the ultra-real time a service-specific preamble sequence to the base station;
  • the base station is configured to identify a preamble sequence sent by the user equipment; when the base station recognizes that the received preamble sequence is sent by the user equipment through a PRACH resource dedicated to the ultra real-time service or is a preamble sequence dedicated to the ultra-real time service And the base station sends, to the user equipment, an RAR that carries short TTI resource allocation information.
  • the integrated modules of the present invention may also be stored in a computer readable storage medium.
  • the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the method of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
  • embodiments of the invention are not limited to any specific combination of hardware and software.
  • the above technical solution effectively reduces the delay of the user plane and the control plane, and satisfies the requirement of the user for the ultra-real time service delay.

Abstract

一种随机接入方法、装置及系统，包括：用户设备接收基站通知的超实时业务专用的物理随机接入信道(PRACH)的配置信息和/或超实时业务专用的前导序列(preamble)的配置信息；当用户设备具有超实时业务并具备短传输时间间隔(TTI)支持能力时，用户设备根据超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发基站为用户设备分配短TTI资源。上述技术方案公开的随机接入方法、装置及系统，能够实现具有超实时业务且具备短TTI支持能力的用户设备在随机接入过程中触发基站为用户设备分配短TTI资源。

Description

一种随机接入方法、装置及系统 技术领域
本文涉及无线通信技术，尤其涉及一种随机接入方法、装置及系统。
背景技术
移动互联网、物联网以及其他业务应用的迅猛发展已经成为推动第五代移动通信技术(5G)发展的主要驱动力。他们迫切要求5G具有媲美光纤的接入速率、千亿设备的连接能力、完美的实时体验以及随时随地的无线宽带接入能力。此外，能耗效率、频谱效率和峰值速率等重要指标也需要在5G系统设计时综合考虑。中国在2013年就已经成立了IMT-2020(5G)推进组来推动5G技术的发展。根据国际整体情况，预计2015年将形成5G愿景、关键能力需求及频谱规划；之后将启动5G标准化工作，计划在2020年后开始商用。国际标准方面，长期演进升级(LTE-Advanced)技术标准主要是在第三代合作伙伴计划(3GPP，3rd Generation Partnership Project)国际标准化组织制订。业界初步认为在3GPP Release 14(R14)版本阶段(预计于2016年)将启动面向5G的标准研究工作。
在未来的移动网络应用中，对业务量需求、终端数目以及终端种类都将会呈现爆发时的增长趋势。作为5G的重要场景和技术手段之一，机器间通信(MTC，Machine Type Communication)正受到越来越多的关注。总的来说，机器间通信有四大主流需求：巨量连接、低能耗、低时延、高可靠。巨量连接体现在MTC设备的数量是目前人对人通信终端的10倍以上；低能耗体现在MTC终端由于具有巨量的特点，因此节能的意义非同一般；低时延和高可靠体现在MTC设备具有1毫秒或者更短的端到端时延。MTC设备经常需要传输超实时业务数据，使数据处理中心便于及时的对业务数据进行分析处理或进而做出相应的动作；因此对超实时业务和时延的研究将成为MTC研究过程中的重要技术点。
在相关长期演进(LTE，Long Term Evolution)系统中，触发随机接入过程的方式有以下三种：方式一，物理下行控制信道(PDCCH，Physical Downlink  Control Channel)触发；方式二，媒体接入控制层(MAC，Media Access Control)触发；方式三，上层触发。对于方式一，当下行数据到达，若用户处于连接态且已经处于非同步状态(失步)，将触发用户发起无线资源控制(RRC，Radio Resource Control)重连接过程；若用户处于空闲状态，则触发用户发起初始随机接入过程。对于方式二，当用户有上行数据需要发送，而用户处于失步状态或者没有用于发送调度请求(SR，Scheduling Request)所需的物理上行控制信道(PUCCH，Physical Uplink Control Channel)资源，此时将触发用户发起RRC连接重配置过程。对于方式三，上层触发的随机接入过程包括初始随机接入、RRC连接重建、切换。
对于具有超实时业务的用户设备，如果能够利用传输时间间隔(TTI，Transmission Time Interval)小于1毫秒(即，短TTI)的资源进行数据传输、信令交互，可有效地降低用户数据的传输时延和信令交互的时延。然而，相关技术未提供在随机接入过程中，触发基站为超实时业务的用户设备分配短TTI资源并利用短TTI资源与用户设备进行信令交互的方案。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供一种随机接入方法、装置及系统，能够实现具有超实时业务且具备短传输时间间隔(TTI)支持能力的用户设备在随机接入过程中触发基站为用户设备分配短TTI资源。
本发明实施例提供一种随机接入方法，包括：
用户设备接收基站通知的超实时业务专用的物理随机接入信道(PRACH)的配置信息和/或超实时业务专用的前导序列(preamble)的配置信息；当用户设备具有超实时业务并具备短TTI支持能力时，用户设备根据超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发基站为用户设备分配短TTI资源。
本发明实施例还提供一种随机接入方法，包括：基站对用户设备发送的前导序列进行识别；当基站识别出接收到的前导序列是由用户设备通过超实时业务专用的PRACH资源发送的或者为超实时业务专用的前导序列时，基站向所述用户设备发送携带短TTI资源分配信息的随机接入响应(RAR)。
本发明实施例还提供一种随机接入装置，设置于用户设备，包括：第一接收模块，设置为接收基站通知的超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息；第一发送模块，设置为当用户设备具有超实时业务并具备短TTI支持能力时，根据超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发基站为用户设备分配短TTI资源。
本发明实施例还提供一种随机接入装置，设置于基站，包括：第二接收模块，设置为对用户设备发送的前导序列进行识别；第二发送模块，设置为当第二接收模块识别出接收到的前导序列是由用户设备通过超实时业务专用的PRACH资源发送的或者为超实时业务专用的前导序列时，向用户设备发送携带短TTI资源分配信息的RAR。
本发明实施例还提供一种随机接入系统，包括：用户设备以及基站；用户设备，设置为接收基站通知的超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息；当用户设备具有超实时业务并具备短TTI支持能力时，用户设备根据超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站；基站对用户设备发送的前导序列进行识别；当基站识别出接收到的前导序列是由用户设备通过超实时业务专用的PRACH资源发送的或者为超实时业务专用的前导序列时，基站向用户设备发送携带短TTI资源分配信息的RAR。
本发明实施例还提供了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述方法。
在本发明实施例中，用户设备接收基站通知的超实时业务专用的PRACH 的配置信息和/或超实时业务专用的前导序列的配置信息；当用户设备具有超实时业务并具备短TTI支持能力时，用户设备根据超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发基站为用户设备分配短TTI资源。可见，在本发明实施例中，通过配置超实时业务专用的PRACH或preamble，对于具有超实时业务并具备短TTI支持能力的用户设备，在发起随机接入的过程中可选用超实时业务专用的PRACH或超实时业务专用的preamble，进而触发基站在接下来的信令交互中使用短TTI资源，并为该用户设备分配短TTI资源，从而有效地降低了用户面和控制面时延，以满足用户超实时业务对时延的需求。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为相关LTE系统中PRACH时频资源配置示意图；
图2为本发明实施例提供的随机接入方法的流程图；
图3a-3d为本发明实施例提供的超实时业务专用的PRACH时频资源配置示意图；
图4为本发明实施例中RAR的MAC PDU的组成示意图；
图5为本发明实施例中随机接入过程的示意图；
图6为本发明实施例提供的另一种随机接入方法流程图；
图7为本发明实施例提供的一种设置于用户设备的随机接入装置组成模块图；
图8为本发明实施例提供的一种设置于基站的随机接入装置组成模块图。
本发明的实施方式
以下结合附图对本发明的实施例进行详细说明，应当理解，以下所说明的实施例仅用于说明和解释本发明，并不用于限定本发明。
图2为本发明实施例提供的随机接入方法的流程图。如图2所示，本实施例提供的随机接入方法包括以下步骤：
步骤11：用户设备接收基站通知的超实时业务专用的物理随机接入信道(PRACH)的配置信息和/或超实时业务专用的前导序列(preamble)的配置信息。
于此，超实时业务专用的PRACH的配置信息包括以下任一种：
超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI；
超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI。
于此，超实时业务专用的前导序列的配置信息包括：在现有用于随机接入的前导序列中超实时业务专用的前导序列的索引。
其中，超实时业务是指业务指标为数据包的延时小于50毫秒的业务。可选的，在LTE系统中，服务质量(QoS，Quality of Service)的等级标识(QCI，QoS class identifier)用于描述用户与策略控制执行功能(PCEF，Policy and Charging Enforcement Function)之间的数据传输的特性。对于超实时业务映射的QCI要求为数据包延时小于50毫秒。
步骤12：当用户设备具有超实时业务并具备短TTI支持能力时，用户设备根据超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发基站为用户设备分配短TTI资源。
本发明实施例还提供一种随机接入方法，如图6所示，包括：基站对用户设备发送的前导序列进行识别；当基站识别出接收到的前导序列是由用户设备通过超实时业务专用的PRACH资源发送的或者为超实时业务专用的前导序列时，基站向用户设备发送携带短TTI资源分配信息的随机接入响应(RAR，Random Access Response)。
其中，所述短TTI资源分配信息为由所述RAR的媒体接入控制协议数据单元(MAC PDU，Media Access Control Protocol Data Unit)中的MAC RAR控制信息单元携带的短TTI的上行授权信息。
可选地，所述基站对用户设备发送的前导序列进行识别之后，该方法还包括：基站根据发起随机接入请求的所有用户设备的短TTI支持能力确定发送RAR的资源。可选的，当一时刻发起随机接入请求的用户设备未全部具备短TTI支持能力，或者该时刻用于发送RAR的物理下行共享信道(PDSCH，Physical Downlink Shared Channel)资源无短TTI资源，基站在TTI长度为1毫秒的PDSCH资源上发送RAR；当一时刻发起随机接入请求的用户设备全部具备短TTI支持能力，且该时刻用于发送RAR的PDSCH资源有短TTI资源，基站在TTI长度小于1毫秒的PDSCH资源上发送RAR。
以下通过多个具体实施例对本发明进行具体说明。
实施例一
本实施例对在现有PRACH时频资源之外定义的超实时业务专用的PRACH(以下简称S-PRACH)进行说明。其中，图1为相关LTE系统中PRACH时频资源的配置示意图。
可选地，如图3a所示，S-PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，并且S-PRACH的帧结构也为1毫秒的TTI。
可选的，在相关的LTE系统中，随机接入无线网络临时标识(RA-RNTI，Random Access–Radio Network Temporary Identifier)用于标识用户设备发送前导序列(preamble)所利用的时频资源位置。RA-RNTI＝1+t-id+10*f-id，其中，t_id表示发送preamble的PRACH所在的第一个子帧号，f_id表示在该子 帧发送preamble的PRACH在频域上的索引。在频分双工(FDD，Frequency Division Duplexing)系统中f-id＝0，因此，在此种S-PRACH与PRACH的资源配置方式下，可能出现两个用户设备选择不同的资源位置(例如，一个用S-PRACH，一个用PRACH)，而导致计算出来的RA-RNTI相同的情况。为避免发生这种情况，于此，定义利用S-PRACH资源发送preamble的RA-RNTI的计算方法为：S-RA-RNTI＝1+t-id+10*f-id+60。然而，本发明实施例并不限于该种计算方法，只要能在值域上区分开PRACH和S-PRACH的时频资源的其他方法均可。
可选地，如图3b所示，S-PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，并且S-PRACH的帧结构为小于1毫秒的短TTI。即在一个TTI长度为1毫秒的PRACH时域内，S-PRACH具有多个短TTI资源可作为S-PRACH的时域资源。
在该种配置方式下，不但要区分PRACH和S-PRACH时频资源位置，还需区分在1毫秒子帧中短TTI上的S-PRACH时频资源位置(即S-PRACH中用于发送preamble的阴影短TTI时频位置，如图3b所示)。于此，定义利用S-PRACH资源发送preamble的RA-RNTI的计算方法为：S-RA-RNTI＝1+(t-id+1)*10+s-t-id+10*f-id+60，其中，t_id表示发送preamble的PRACH所在的第一个子帧号，f_id表示在该子帧发送preamble的PRACH在频域上的索引，s-t-id表示用于发送preamble的S-PRACH的子帧号。然而，本发明实施例并不限于该种计算方法，只要能在值域上区分开PRACH和S-PRACH资源的其他计算方法均可。
可选地，如图3c所示，S-PRACH与现有PRACH占用不同的时域位置，S-PRACH的帧结构为1毫秒的TTI。
在该种配置方式下，可定义利用S-PRACH资源发送preamble的RA-RNTI的计算方法为：S-RA-RNTI＝1+s-t-id+10*f-id+60，其中，f_id表示发送preamble的PRACH在频域上的索引，s-t-id代表用于发送preamble的S-PRACH的子帧号。然而，本发明实施例并不限于该种计算方法，只要能在值域上区分开PRACH和S-PRACH资源的其他计算方法均可。
可选地，如图3d所示，S-PRACH与现有PRACH占用不同的时域位置， S-PRACH的帧结构为小于1毫秒的短TTI。在1毫秒时间内的多个短TTI可选用部分或全部用作S-PRACH的时域资源。
在该种配置方式下，可定义利用S-PRACH资源发送preamble的RA-RNTI的计算方法为：S-RA-RNTI＝1+t-id*10+s-t-id+10*f-id+60，其中，t_id表示发送preamble的PRACH所在的第一个子帧号，f_id表示在该子帧发送preamble的PRACH在频域上的索引，s-t-id代表用于发送preamble的S-PRACH的子帧号。然而，本发明实施例并不限于该种计算方法，只要能在值域上区分开PRACH和S-PRACH资源的其他计算方法均可。
于本实施例中，基站在系统信息块2(SIB-2，System Information Block-2)中加入S-PRACH的配置信息，并通过广播通知小区内的所有用户设备。
实施例二
本实施例对在现有preamble中划分部分preamble用于映射超实时业务进行说明。
在LTE系统中，用于随机接入的preamble承载于PRACH上。为了在用户设备发送preamble的过程中，基站可获得用户设备的业务特征信息，以便于基站合理分配上行授权资源，将现有的一个小区中的64个用于随机接入的preamble划分出部分preamble用于映射超实时业务。可选的，系统根据小区中具有超实时业务且具备短TTI支持能力的用户设备数目占总用户设备数目的比例来确定划分映射超实时业务的preamble所占的比例。
于本实施例中，基站在系统信息块2(SIB-2，System Information Block-2)中加入超实时业务专用的preamble的配置信息，并通过广播通知小区内的所有用户设备。其中，超实时业务专用的preamble的配置信息包括：在现有用于随机接入的preamble中超实时业务专用的preamble的索引，例如，在现有一个小区的64个用于随机接入的preamble中划分出的用于映射超实时业务的preamble的索引。
实施例三
本实施例对基站收到用户设备发送的preamble后，基站发送随机接入响应(RAR，Random Access Response)的方式进行具体说明。
可选的，基站收到用户设备发送的preamble后，基站发送随机接入响应(RAR，Random Access Response)的方式包括以下任一种：
基站在TTI长度为1毫秒的子帧资源上发送RAR给用户设备，可选的，当一个时刻发起随机接入请求的用户设备并非全部都具备短TTI支持能力，或者，该时刻用于发送RAR的物理下行共享信道(PDSCH，Physical Downlink Shared Channel)资源无短TTI资源，则基站将在TTI长度为1毫秒的子帧资源上发送RAR；
基站在TTI长度小于1毫秒的子帧资源上发送RAR给用户设备，可选的，当一个时刻发起随机接入请求的用户设备全部都具备短TTI支持能力，并且该时刻用于发送RAR的PDSCH资源有短TTI资源，则基站将在TTI长度小于1毫秒的子帧资源上发送RAR。
可选地，对于利用S-PRACH资源发送preamble或者选用超实时专用的preamble的用户设备，基站发送的RAR的MAC PDU中的MAC RAR控制信息单元携带短TTI的上行授权信息。其中，本发明实施例中RAR的MAC PDU的组成示意图如图4所示。
实施例四
本实施例对引入超实时业务专用的S-PRACH或preamble后的随机接入过程进行说明。图5为本发明实施例中随机接入过程的示意图。如图5所示，本实施例具体说明如下：
步骤501：用户设备发起随机接入时，选择合适的用于发送preamble的PRACH资源(如S-PRACH或普通PRACH)或选择合适的preamble(如超实时业务专用的preamble或非超实时业务专用的preamble)完成发送preamble给基站；
步骤502：基站根据该时刻发起随机接入请求的所有用户设备对TTI的支持能力确定选用TTI长度为1毫秒的PDSCH资源发送RAR或TTI长度小于1毫秒的PDSCH资源发送RAR；其中，对于利用超实时业务专用的S-PRACH或preamble的用户设备，基站将在其MAC RAR控制信息单元携带短TTI的上行授权信息；
根据实施例一所述的RA-RNTI的计算方法，用户设备在物理下行控制信道(PDCCH，Physical Downlink Control Channel)上检测是否有自己对应的RA-RNTI；若有，再依据PDCCH上的指示去读取PDSCH上的RAR消息；
步骤503：由于在步骤501中可能有多个用户设备选择了相同的随机接入资源完成发送preamble；即出现冲突，为了解决冲突，用户设备需利用在步骤502中分配的资源发送RRC连接建立消息，并携带用户设备的标识(ID)；
步骤504：基站发送竞争解决消息，如果MAC PDU的控制消息中包含的用于竞争消除的ID跟用户设备发送的用于竞争消除的ID相匹配，则竞争成功；若步骤501中用户设备选用超实时业务专用的S-PRACH或专用的preamble，那么此时基站可选择短TTI资源传输此消息以降低该信令传输时延。
本发明实施例还提供了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述方法。
此外，本发明实施例还提供一种随机接入装置，设置于用户设备，如图7所示，包括：
第一接收模块，设置为接收基站通知的超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息；
第一发送模块，设置为当所述用户设备具有超实时业务并具备短TTI支持能力时，根据所述超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发所述基站为所述用户设备分配短TTI资源。
可选地，所述超实时业务专用的PRACH的配置信息包括以下任一种：
超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI；
超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI。
可选地，所述超实时业务专用的前导序列的配置信息包括：在现有用于随机接入的前导序列中超实时业务专用的前导序列的索引。
可选地，所述超实时业务是指业务指标为数据包的延时小于50毫秒的业务。
此外，本发明实施例还提供一种随机接入装置，设置于基站，如图8所示，包括：
第二接收模块，设置为对用户设备发送的前导序列进行识别；
第二发送模块，设置为当第二接收模块识别出接收到的前导序列是由用户设备通过超实时业务专用的PRACH资源发送的或者为超实时业务专用的前导序列时，向所述用户设备发送携带短TTI资源分配信息的RAR。
其中，所述短TTI资源分配信息为由所述RAR的MAC PDU中的MAC RAR控制信息单元携带的短TTI的上行授权信息。
可选地，所述第二发送模块，还设置为：根据发起随机接入请求的所有用户设备的短TTI支持能力确定发送RAR的资源。可选的，当一时刻发起随机接入请求的用户设备未全部具备短TTI支持能力，或者该时刻用于发送RAR的PDSCH资源无短TTI资源，在TTI长度为1毫秒的PDSCH资源上发送RAR；当一时刻发起随机接入请求的用户设备全部具备短TTI支持能力，且该时刻用于发送RAR的PDSCH资源有短TTI资源，在TTI长度小于1毫秒的PDSCH资源上发送RAR。
于实际应用中，第一接收模块及第二接收模块例如为接收器等具有信息接收能力的通信元件，第一发送模块及第二发送模块例如为发射器等具有信 息传输能力的通信元件。然而，本发明并不限定于此。上述模块例如为可以实现预定功能的软件和/或硬件的组合。
此外，本发明实施例还提供一种随机接入系统，包括：用户设备以及基站；
所述用户设备，设置为接收基站通知的超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息；当所述用户设备具有超实时业务并具备短TTI支持能力时，所述用户设备根据所述超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站；
所述基站设置为对用户设备发送的前导序列进行识别；当所述基站识别出接收到的前导序列是由用户设备通过超实时业务专用的PRACH资源发送的或者为超实时业务专用的前导序列时，所述基站向所述用户设备发送携带短TTI资源分配信息的RAR。
关于上述装置及系统的具体处理流程同上述方法所述，故于此不再赘述。
本发明所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明实施例的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机、服务器、或者网络设备等)执行本发明所述方法的全部或部分。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。这样，本发明实施例不限制于任何特定的硬件和软件结合。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的 原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。
工业实用性
上述技术方案有效地降低了用户面和控制面时延，满足了用户超实时业务对时延的需求。

Claims (17)

  1. 一种随机接入方法，包括：
    用户设备接收基站通知的超实时业务专用的物理随机接入信道PRACH的配置信息和/或超实时业务专用的前导序列preamble的配置信息；
    当所述用户设备具有超实时业务并具备短传输时间间隔TTI支持能力时，所述用户设备根据所述超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发所述基站为所述用户设备分配短TTI资源。
  2. 如权利要求1所述的方法，其中，所述超实时业务专用的PRACH的配置信息包括以下任一种：
    超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
    超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI；
    超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
    超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI。
  3. 如权利要求1所述的方法，其中，所述超实时业务专用的前导序列的配置信息包括：
    在现有用于随机接入的前导序列中超实时业务专用的前导序列的索引。
  4. 如权利要求1至3任一项所述的方法，其中，
    所述超实时业务是指业务指标为数据包的延时小于50毫秒的业务。
  5. 一种随机接入方法，包括：
    基站对用户设备发送的前导序列进行识别；
    当所述基站识别出接收到的前导序列是由用户设备通过超实时业务专用的物理随机接入信道PRACH资源发送的或者为超实时业务专用的前导序列时，所述基站向所述用户设备发送携带短传输时间间隔TTI资源分配信息的随机接入响应RAR。
  6. 如权利要求5所述的方法，其中，
    所述短TTI资源分配信息为由所述RAR的媒体接入控制协议数据单元MAC PDU中的MAC RAR控制信息单元携带的短TTI的上行授权信息。
  7. 如权利要求5所述的方法，还包括：
    所述基站对用户设备发送的前导序列进行识别之后，所述基站根据发起随机接入请求的所有用户设备的短TTI支持能力确定发送RAR的资源。
  8. 如权利要求7所述的方法，其中，所述基站根据发起随机接入请求的所有用户设备的短TTI支持能力确定发送RAR的资源包括：
    当一时刻发起随机接入请求的用户设备未全部具备短TTI支持能力，或者该时刻用于发送RAR的物理下行共享信道PDSCH资源无短TTI资源，所述基站在TTI长度为1毫秒的PDSCH资源上发送RAR；
    当一时刻发起随机接入请求的用户设备全部具备短TTI支持能力，且该时刻用于发送RAR的PDSCH资源有短TTI资源，所述基站在TTI长度小于1毫秒的PDSCH资源上发送RAR。
  9. 一种随机接入装置，设置于用户设备，包括：
    第一接收模块，设置为接收基站通知的超实时业务专用的物理随机接入信道PRACH的配置信息和/或超实时业务专用的前导序列的配置信息；
    第一发送模块，设置为当所述用户设备具有超实时业务并具备短传输时间间隔TTI支持能力时，根据所述超实时业务专用的PRACH的配置信息和/或超实时业务专用的前导序列的配置信息，通过超实时业务专用的PRACH资源发送前导序列给基站，或者，发送超实时业务专用的前导序列给基站，以触发所述基站为所述用户设备分配短TTI资源。
  10. 如权利要求9所述的装置，其中，所述超实时业务专用的PRACH 的配置信息包括以下任一种：
    超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
    超实时业务专用的PRACH与现有PRACH占用同一个TTI为1毫秒的时域位置，频域资源位置不同，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI；
    超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为1毫秒的TTI；
    超实时业务专用的PRACH与现有PRACH占用不同的时域位置，且超实时业务专用的PRACH的帧结构为小于1毫秒的短TTI。
  11. 如权利要求9所述的装置，其中，所述超实时业务专用的前导序列的配置信息包括：
    在现有用于随机接入的前导序列中超实时业务专用的前导序列的索引。
  12. 如权利要求9至11任一项所述的装置，其中，
    所述超实时业务是指业务指标为数据包的延时小于50毫秒的业务。
  13. 一种随机接入装置，设置于基站，包括：
    第二接收模块，设置为对用户设备发送的前导序列进行识别；
    第二发送模块，设置为当所述第二接收模块识别出接收到的前导序列是由用户设备通过超实时业务专用的物理随机接入信道PRACH资源发送的或者为超实时业务专用的前导序列时，向所述用户设备发送携带短传输时间间隔TTI资源分配信息的随机接入响应RAR。
  14. 如权利要求13所述的装置，其中，
    所述短TTI资源分配信息为由所述RAR的媒体接入控制协议数据单元MAC PDU中的MAC RAR控制信息单元携带的短TTI的上行授权信息。
  15. 如权利要求13所述的装置，
    所述第二发送模块，还设置为根据发起随机接入请求的所有用户设备的 短TTI支持能力确定发送RAR的资源。
  16. 如权利要求15所述的装置，其中，
    所述第二发送模块，是设置为通过如下方式实现根据发起随机接入请求的所有用户设备的短TTI支持能力确定发送RAR的资源：
    当一时刻发起随机接入请求的用户设备未全部具备短TTI支持能力，或者该时刻用于发送RAR的物理下行共享信道PDSCH资源无短TTI资源，在TTI长度为1毫秒的PDSCH资源上发送RAR；
    当一时刻发起随机接入请求的用户设备全部具备短TTI支持能力，且该时刻用于发送RAR的PDSCH资源有短TTI资源，在TTI长度小于1毫秒的PDSCH资源上发送RAR。
  17. 一种随机接入系统，包括：
    如权利要求9至12任一项所述的用户设备以及如权利要求13至16任一项所述的基站。
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