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WO2017024912A1 - 一种随机接入方法、设备和系统 - Google Patents

一种随机接入方法、设备和系统 Download PDF

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Publication number
WO2017024912A1
WO2017024912A1 PCT/CN2016/089421 CN2016089421W WO2017024912A1 WO 2017024912 A1 WO2017024912 A1 WO 2017024912A1 CN 2016089421 W CN2016089421 W CN 2016089421W WO 2017024912 A1 WO2017024912 A1 WO 2017024912A1
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WO
WIPO (PCT)
Prior art keywords
ack
terminal
nack feedback
msg3
rnti
Prior art date
Application number
PCT/CN2016/089421
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English (en)
French (fr)
Inventor
高雪娟
邢艳萍
Original Assignee
电信科学技术研究院
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Publication date
Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Publication of WO2017024912A1 publication Critical patent/WO2017024912A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a random access method, device, and system in a coverage enhancement scenario.
  • the contention of the random access means that the base station (eNodeB, eNB for short) does not allocate dedicated resources for the terminal (User Terminal, User Equipment, UE), and is randomly initiated by the terminal.
  • Competitive random access is applicable to all five scenarios: for the scenario of radio resource control (RRC) connection establishment, RRC connection reestablishment, and uplink data arrival, random access is completely autonomous by the terminal, and the eNB does not have any prior.
  • RRC radio resource control
  • the terminal initiates random access according to the indication of the eNB.
  • the eNB preferentially selects non-contention random access, and only when the non-contention random access resource is insufficiently allocated, Instruct the terminal to initiate a contention random access.
  • the competitive random access process is completed in four steps. As shown in Figure 1, each step is called a message (Msg for short), and these four steps are called Msg1 to Msg4. among them:
  • the message is an uplink message, which is sent by the terminal, and is received by the eNB, and the bearer is sent in a physical random access channel (Physical Random Access Channel, PRACH for short).
  • PRACH Physical Random Access Channel
  • the preamble sequence sent by the terminal is randomly selected in the specific preamble set, and the different preamble sequences have different identification information, that is, a preamble index.
  • the message is a downlink message, which is sent by the eNB and received by the terminal.
  • Msg2 is the response of the eNB to the random access initiated by the terminal after receiving the Msg1, and must be sent in the random access response window.
  • the start of the random access response window is the first available downlink subframe that satisfies n+3, and n is the last subframe transmitted by the preamble sequence, and the length is 2 to 10 ms, which is specified by the eNB in the system message.
  • the Msg2 is carried by a Downlink Shared Channel (DL-SCH) defined by a Media Access Control (MAC) layer, and corresponds to a Physical Downlink Shared Channel (PDSCH) at the physical layer.
  • DL-SCH Downlink Shared Channel
  • MAC Media Access Control
  • PDSCH Physical Downlink Shared Channel
  • An Msg2 can respond to the random access request of multiple terminals, that is, the RAR of multiple terminals at the same time. Therefore, the Msg2 does not have a Hybrid Automatic Repeat ReQuest (HARQ) process, that is, there is no feedback retransmission process.
  • HARQ Hybrid Automatic Repeat ReQuest
  • the eNB schedules Msg2, RA by using a Physical Downlink Control Channel (PDCCH) scrambled by a Random Access Radio Network Temporary Identifier (RA-RNTI) transmitted in a common search space.
  • PDCCH Physical Downlink Control Channel
  • RA-RNTI Random Access Radio Network Temporary Identifier
  • the RNTI is determined by the location of the PRACH time-frequency resource for transmitting the Msg1; the terminal that uses the same PRACH time-frequency resource calculates the same RA-RNTI, and the RAR information is packetized and sent in the same RAR message, and the RAR message is carried by the RA-
  • the RNTI scrambled PDCCH schedules the downlink shared channel, and the downlink shared channel also uses the RA-RNTI for scrambling.
  • the content of the Msg2 includes: a backoff parameter, identification information of a preamble sequence corresponding to Msg1, an uplink transmission timing advance (TA), and an uplink scheduling grant of Msg3 (UL grant, also referred to as a RAR grant at the physical layer).
  • TA uplink transmission timing advance
  • UL grant also referred to as a RAR grant at the physical layer.
  • the backoff parameter is used to indicate the average delay of the next time the terminal initiates random access if the random access fails.
  • the terminal identifies the RAR message carrying the RAR (ie, Msg2 sent in the DL-SCH) by using the RA-RNTI determined by the PRACH time-frequency domain resource used by the preamble sequence in Msg1, and the RAR message is based on itself. Identification letter of the preamble sequence sent in Msg1 The information determines the RAR sent to itself. If the terminal does not correctly receive the Msg2, the delay of the next random access is determined according to the delay limit of the backoff parameter, and the random access resource is selected to initiate the next random access. After the maximum number of random accesses is reached, the MAC layer of the terminal reports a random access problem to the RRC layer, triggering a Radio Link Failure (RLF) process.
  • RLF Radio Link Failure
  • the message is an uplink message, which is sent by the terminal and received by the eNB.
  • the terminal After receiving the Msg2, the terminal performs the uplink transmission on the uplink resource indicated by the UL grant (ie, the RAR grant) included in the obtained RAR, that is, the physical uplink shared channel is transmitted according to the scheduling information in the RAR grant of the terminal.
  • the PUSCH Physical Uplink Shared Channel
  • the PUSCH corresponds to an uplink shared channel (UL-SCH) of the MAC layer.
  • the uplink resource can transmit a minimum of 56 bits.
  • Msg3 The initial transmission of Msg3 is the only uplink transmission dynamically scheduled by the MAC layer, which requires MAC layer processing. Therefore, Msg3 and Msg2 are separated by at least 6 ms.
  • the retransmission of other Msg3 is performed by the PDCCH, and the PDCCH is transmitted in the common search space, and Scramble using TC-RNTI.
  • Msg3 contains different content:
  • the initial access carries the RRC connection request message generated by the RRC layer, and does not include a Non-Access Stratum (NAS) message; the logical channel corresponding to the MAC layer is a Common Control Channel (CCCH) transmission. ;
  • NAS Non-Access Stratum
  • CCCH Common Control Channel
  • Connection reestablishment carrying the RRC connection reestablishment request generated by the RRC layer, does not include the NAS message; the logical channel corresponding to the MAC layer is the CCCH;
  • the logical channel corresponding to the MAC layer is a dedicated control channel (Dedicate Control Channel, DCCH); the C-RNTI of the transmission terminal; if the resource is sufficient, the uplink buffer status report may be included (BSR);
  • DCCH Dedicate Control Channel
  • Uplink and downlink data arrival at least the C-RNTI of the transmission terminal.
  • the message is a downlink message, which is sent by the eNB and received by the terminal.
  • the eNB and the terminal complete the final contention resolution through Msg4.
  • the content of Msg4 is related to Msg3 The content corresponds.
  • MTC Machine Type Communication
  • LTE Long Term Evolution
  • M2M Machine to Machine
  • the MTC system has determined that the Physical Hybrid-ARQ Indicator Channel (PHICH) transmission is not supported.
  • PHICH Physical Hybrid-ARQ Indicator Channel
  • NACK Negative ACKnowledge
  • the embodiment of the present invention provides a random access method, device, and system, which are used to solve the ACK/NACK feedback by using an independent UL grant for each terminal Msg3. Big problem.
  • the terminal uses the RNTI dedicated to ACK/NACK feedback to detect a downlink control channel to obtain a downlink message for carrying ACK/NACK feedback corresponding to Msg3;
  • the terminal obtains ACK/NACK feedback of the terminal Msg3 from the downlink message according to the location of the ACK/NACK corresponding to the Msg3 of the terminal in the downlink message.
  • the terminal before the acquiring, by the terminal, the ACK/NACK feedback of the Msg3 of the terminal, the terminal further includes:
  • the terminal determines the location of the ACK/NACK corresponding to the Msg3 of the terminal in the downlink message.
  • the determining, by the terminal, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message includes:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the terminal determines the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message, including:
  • the ratio of A before the location of each ACK/NACK feedback in the downlink message is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the terminal determines the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message, including:
  • the terminal Determining, by the terminal, the Msg3 of the terminal according to at least one of the physical resource block PRB used by the terminal to transmit the Msg3, the narrowband information in which the Msg3 is transmitted, and the pilot cyclic shift information used to transmit the Msg3.
  • the corresponding ACK/NACK is fed back to the location in the downlink message.
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified by the base station to the terminal by using a system message.
  • the method further includes:
  • the terminal If the ACK/NACK feedback of the Msg3 of the terminal is NACK, the terminal retransmits the Msg3 of the terminal according to the scheduling information indicated by the RAR grant grant corresponding to the terminal.
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message;
  • the base station Determining, by the base station, that the RA-RNTI is corresponding to the corresponding relationship between the RA-RNTI corresponding to the at least two terminals and the RNTI dedicated to ACK/NACK feedback RNTI for ACK/NACK feedback;
  • the base station scrambles the downlink message by using the RNTI dedicated to ACK/NACK feedback, and sends the scrambled downlink message through the downlink control channel.
  • the base station mapping the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message including:
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message according to the location of the RAR corresponding to the at least two terminals in the RAR message;
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message, including:
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message according to the identifier information of the preamble sequence of the at least two terminals;
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the base station mapping the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message including:
  • the base station according to at least one of the PRB used by the at least two terminals to transmit the Msg3, the narrowband information in which the Msg3 is transmitted, and the pilot cyclic shift information used to transmit the Msg3, the at least two terminals
  • the ACK/NACK feedback corresponding to Msg3 is mapped to the downlink message.
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the method further includes:
  • the base station re-receives the Msg3 retransmitted by the terminal with the ACK/NACK feedback as the NACK according to the scheduling information indicated by the RAR grant of the terminal whose ACK/NACK feedback is NACK.
  • a determining module configured to determine, according to a correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback, an RNTI dedicated to the ACK/NACK feedback corresponding to the RA-RNTI of the terminal to which the terminal belongs;
  • a downlink message obtaining module configured to detect, by using the RNTI dedicated to ACK/NACK feedback, a downlink control channel, to obtain a downlink message for carrying ACK/NACK feedback corresponding to Msg3;
  • the processing module is configured to obtain, according to the location of the ACK/NACK corresponding to the Msg3 of the terminal, the ACK/NACK feedback of the terminal Msg3 from the downlink message.
  • the processing module before the processing module acquires the ACK/NACK feedback of the terminal Msg3 from the downlink message, the processing module is further configured to:
  • the processing module is specifically configured to:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the processing module is specifically configured to:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the processing module is specifically configured to:
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified by the base station to the terminal by using a system message.
  • the terminal further includes:
  • a retransmission module configured to retransmit the Msg3 of the terminal according to the scheduling information indicated by the RAR grant when the ACK/NACK feedback of the Msg3 of the terminal is NACK.
  • a receiving module configured to receive Msg3 sent by at least two terminals
  • a feedback information generating module configured to generate ACK/NACK feedback corresponding to the Msg3 of the at least two terminals
  • mapping module configured to map ACK/NACK feedback corresponding to the Msg3 of the at least two terminals into a downlink message
  • a determining module configured to determine, according to a correspondence between the RA-RNTI corresponding to the at least two terminals and an RNTI dedicated to ACK/NACK feedback, that the RA-RNTI is dedicated to RNTI for ACK/NACK feedback;
  • a sending module configured to scramble the downlink message by using the RNTI dedicated to ACK/NACK feedback, and send the scrambled downlink message by using a downlink control channel.
  • mapping module is specifically configured to:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • mapping module is specifically configured to:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • mapping module is specifically configured to:
  • Msg3 corresponding to the at least two terminals according to at least one of the PRB used by the at least two terminals to transmit the Msg3, the narrowband information in which the Msg3 is transmitted, and the pilot cyclic shift information used to transmit the Msg3
  • the ACK/NACK feedback is mapped into the downlink message.
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the receiving module is further configured to:
  • the Msg3 retransmitted by the terminal whose ACK/NACK feedback is NACK is re-received according to the scheduling information indicated by the RAR grant of the terminal whose ACK/NACK feedback is NACK.
  • Another terminal provided by the embodiment of the present invention includes: a transceiver, and at least one processor connected to the transceiver, where:
  • the processor is configured to read a program in the memory and perform the following process:
  • the transceiver is configured to receive and transmit data under the control of the processor.
  • the processor obtains the ACK/NACK feedback of the terminal Msg3 from the downlink message.
  • the following process is also performed:
  • the determining, by the processor, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message includes:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the determining, by the processor, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message includes:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the determining, by the processor, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message includes:
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the transceiver also performs the following processes:
  • the Msg3 of the terminal is retransmitted according to the scheduling information indicated by the RAR grant corresponding to the terminal.
  • Another base station provided by the embodiment of the present invention includes: a transceiver, and at least one processor connected to the transceiver, where:
  • a processor for reading a program in the memory performing the following process:
  • the processor specifically performs the following processes:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the processor specifically performs the following processes:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the processor specifically performs the following processes:
  • Msg3 corresponding to the at least two terminals according to at least one of the PRB used by the at least two terminals to transmit the Msg3, the narrowband information in which the Msg3 is transmitted, and the pilot cyclic shift information used to transmit the Msg3
  • the ACK/NACK feedback is mapped into the downlink message.
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the transceiver also performs the following processes:
  • the Msg3 retransmitted by the terminal whose ACK/NACK feedback is NACK is re-received according to the scheduling information indicated by the RAR grant of the terminal whose ACK/NACK feedback is NACK.
  • a base station configured to receive Msg3 sent by at least two terminals, and generate ACK/NACK feedback corresponding to Msg3 of the at least two terminals; and map ACK/NACK feedback corresponding to Msg3 of the at least two terminals to a downlink message Determining an RNTI dedicated to ACK/NACK feedback corresponding to the RA-RNTI according to a correspondence between an RA-RNTI corresponding to the at least two terminals and an RNTI dedicated to ACK/NACK feedback; using the dedicated The RNTI fed back by the ACK/NACK scrambles the downlink message, and sends the scrambled downlink message through the downlink control channel;
  • a terminal configured to determine, according to a correspondence between the RA-RNTI and an RNTI dedicated to ACK/NACK feedback, an RNTI dedicated to ACK/NACK feedback corresponding to the RA-RNTI of the terminal; and using the dedicated ACK/NACK feedback
  • the RNTI detects the downlink control channel to obtain a downlink message for carrying the ACK/NACK feedback corresponding to the Msg3; and the location of the ACK/NACK corresponding to the Msg3 of the terminal in the downlink message, from the downlink message Obtaining ACK/NACK feedback of the terminal Msg3.
  • the embodiment of the present invention provides a scheme for transmitting an ACK/NACK feedback of a Msg3 of a downlink control channel for a downlink control channel dedicated to RN/NACK feedback ACK/NACK feedback corresponding to the RA-RNTI of the terminal, and implementing multiple The multicast of the ACK/NACK feedback of the terminal's Msg3 improves the feedback efficiency and saves system resources.
  • FIG. 2 is a schematic diagram of a method for random access on a terminal side according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a mapping manner of RARs of different terminals in a downlink shared channel carrying RAR according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of mapping manners of ACK/NACK feedback corresponding to Msg3 of a first terminal in a downlink message according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of mapping manners of ACK/NACK feedback corresponding to Msg3 of a second terminal in a downlink message according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a PRB used by a terminal to transmit Msg3 according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of mapping manners of ACK/NACK feedback corresponding to Msg3 of a third terminal in a downlink message according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of a method for random access on a terminal side according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of a first terminal according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of a first type of base station according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram of a second terminal according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic diagram of a second base station according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of a communication system according to an embodiment of the present invention.
  • a random access method on the terminal side is provided in the embodiment of the present invention. As shown in FIG. 2, the method includes the following process:
  • the terminal determines, according to the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback, the RNTI dedicated to the ACK/NACK feedback corresponding to the RA-RNTI of the terminal;
  • the terminal detects the downlink control channel by using the determined RNTI dedicated to ACK/NACK feedback, to obtain a downlink message for carrying the ACK/NACK feedback corresponding to the Msg3.
  • the terminal obtains ACK/NACK feedback of the terminal Msg3 from the downlink message according to the location of the ACK/NACK corresponding to the Msg3 of the terminal in the downlink message.
  • the terminal determines, according to the correspondence between the RA-RNTI and the RNTI dedicated to ACK/NACK feedback, that the RA-RNTI corresponding to the terminal is dedicated to ACK/NACK feedback.
  • RNTI using the determined RNTI dedicated to ACK/NACK feedback, detecting a downlink control channel to obtain a downlink message for carrying ACK/NACK feedback corresponding to Msg3; and ACK/NACK feedback corresponding to Msg3 of the terminal is in the downlink
  • the location in the message, the ACK/NACK feedback of the terminal's Msg3 is obtained from the downlink message.
  • the embodiment of the present invention provides a scheme for transmitting an ACK/NACK feedback of a Msg3 of a downlink control channel for a downlink control channel dedicated to RN/NACK feedback ACK/NACK feedback corresponding to the RA-RNTI of the terminal, and implementing multiple The multicast of the ACK/NACK feedback of the terminal's Msg3 improves the feedback efficiency and saves system resources.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message, such as by using a system information block (System Information Block, referred to as SIB) Notice.
  • SIB System Information Block
  • the embodiment of the present invention does not limit the specific implementation manner of the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback, and the corresponding relationship may be implemented by using the correspondence relationship list shown in Table 1;
  • RA-RNTI AN-RNTI (RNTI dedicated to ACK/NACK feedback) RA-RNTI-1 AN-RNTI-1 RA-RNTI-2 AN-RNTI-2 RA-RNTI-3 AN-RNTI-3 RA-RNTI-4 AN-RNTI-4 RA-RNTI-5 AN-RNTI-5 RA-RNTI-6 AN-RNTI-6 RA-RNTI-7 AN-RNTI-7 RA-RNTI-8 RA-RNTI-9 AN-RNTI-9
  • AN-RNTI RA-RNTI+X
  • AN-RNTI represents an RNTI dedicated to ACK/NACK feedback
  • X represents an RA-RNTI offset value
  • the downlink control channel detected in S22 is an enhanced physical downlink control channel (Enhanced PDCCH, referred to as EPDCCH).
  • Enhanced PDCCH enhanced physical downlink control channel
  • the downlink control channel detected in S22 is transmitted in a common search space.
  • the downlink message obtained in S22 is Downlink Control Information (DCI) dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information It is divided into N information fields, and each of the N information fields is used to carry one ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • DCI Downlink Control Information
  • the downlink message is always sent according to a fixed size, for example, always transmitted according to M bits, where M bits are divided into N regions, and each of the N regions is used to carry one ACK/NACK feedback.
  • the number of terminals that are RNTI scrambled and transmit RAR in the same physical downlink shared channel is the same. If the number of RARs transmitted is less than N, then the other areas in the N areas are set to 0 placeholders, indicating no information.
  • the terminal before the terminal obtains the ACK/NACK feedback of the Msg3 of the terminal from the downlink message, the terminal further includes:
  • the terminal determines the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message.
  • the terminal determines that the ACK/NACK corresponding to the Msg3 of the terminal is in the downlink message.
  • the location in the middle includes the following three preferred implementations:
  • the terminal determines the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message according to the location of the RAR of the terminal in the RAR message (hereinafter abbreviated as Msg2).
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the Msg2, and the Msg2 is scrambled by the RA-RNTI of the terminal (that is, the PDSCH carrying the Msg2)
  • the scrambling initialization is determined by the RA-RNTI); in addition, the PDCCH/EPDCCH (ie, the PDCCH/EPDCCH carrying the Msg2 scheduling information, the scheduling information used to indicate the transmission resource and the transmission mode of the Msg2, etc.) of the Msg2 is also used.
  • -RNTI scrambling ie, the PDCCH/EPDCCH carrying the Msg2 scheduling information, the scheduling information used to indicate the transmission resource and the transmission mode of the Msg2, etc.
  • the mapping manner of the RARs of different terminals using the same PRACH time-frequency domain resources (that is, the determined RA-RNTIs are the same) in the RAR message of the RARs of multiple terminals carried by the physical downlink shared channel is as shown in FIG.
  • the RAR of the terminal 1 is in the first position, that is, the MAC RAR1 in FIG. 3, the RAR of the terminal 2 is in the second position, that is, the MAC RAR2 in FIG. 3, and the RAR of the terminal 3 is in the third position. That is, MAC RAR3 in FIG. 3, RAR ordering of other terminals, and so on.
  • the mapping manner of the ACK/NACK feedback corresponding to the Msg3 of the different terminal in the downlink message is the same as that of the RAR corresponding to the terminal in the Msg2, and the downlink message of the ACK/NACK feedback corresponding to the Msg3 of the different terminal is as shown in FIG. 4 It is shown that the ACK/NACK feedback corresponding to Msg3 of terminal 1 is at the first position, the ACK/NACK feedback corresponding to Msg3 of terminal 2 is at the second position, and the ACK/NACK feedback corresponding to Msg3 of terminal 3 is at the third position.
  • the ordering of ACK/NACK feedback corresponding to Msg3 of other terminals is similar.
  • the mode 2 determines, according to the identifier information of the preamble sequence of the terminal, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message.
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the A bit information or the subsequent A bit information before the location of the ACK/NACK feedback of each terminal in the downlink message is an indication field, and the indication field is used to indicate the end.
  • Identification information of the preamble sequence of the terminal (such as the number, index, etc. of the preamble sequence), as shown in FIG. 5, the indication field of the A bit information before the ACK/NACK feedback corresponding to the Msg3 of the terminal 1 indicates the index of the preamble sequence of the terminal 1.
  • the indication field of the A bit information before the ACK/NACK feedback corresponding to the Msg3 of the terminal 2 indicates the index of the preamble sequence of the terminal 2, that is, the preamble index 2; the A before the ACK/NACK feedback corresponding to the Msg3 of the terminal 3
  • the indication field of the bit information indicates the index of the preamble sequence of the terminal 3, that is, the preamble index 3, the ACK/NACK feedback corresponding to the Msg3 of the other terminal, and the like.
  • Manner 3 The terminal determines, according to at least one of a physical resource block (PRB) used by the terminal to transmit Msg3, narrowband information in which Msg3 is transmitted, and pilot cyclic shift information used in transmitting Msg3. The location of the ACK/NACK corresponding to the Msg3 of the terminal in the downlink message.
  • PRB physical resource block
  • the order of the ACK/NACK feedback corresponding to the Msg3 of the different terminals in the downlink message is the order in which the numbers of the PRBs used by the different terminals to transmit the Msg3 are from large to small or from small to large. Since the downlink message of the ACK/NACK feedback corresponding to the Msg3 carrying the different terminals is defined according to all the narrowband positions in the system, which narrowband is used by the terminal to transmit its Msg3, the ACK/ corresponding to the Msg3 of the terminal is The NACK feedback is mapped to the corresponding location in the downlink message. The order of the ACK/NACK feedback corresponding to the Msg3 of the different terminals in the downlink message is the same as the order of the pilot cyclic shift information used by the different terminal to transmit the Msg3.
  • the PRBs used by the terminal 1 to the terminal 6 to transmit the Msg3 are the PRBs 1 to the PRBs in the same subband.
  • the terminal may also use the PRBs in different subbands, which is not limited in this embodiment of the present invention.
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the terminal 1 to the terminal 6 in the downlink message according to the sequence of the PRB from small to large.
  • the ACK/NACK corresponding to the Msg3 of the terminal 1 of the PRB1 is used.
  • the ACK/NACK feedback corresponding to Msg3 of terminal 2 using PRB2 is in the second position, and the ACK/NACK feedback corresponding to Msg3 of terminal 3 using PRB3 is in the third position, and Msg3 corresponding to other terminals is corresponding.
  • the terminal after the terminal obtains the ACK/NACK feedback of the Msg3 of the terminal from the downlink message, the terminal further includes:
  • the terminal retransmits the Msg3 of the terminal according to the scheduling information indicated by the RAR grant corresponding to the terminal, where the RAR grant is carried in the RAR obtained by the terminal in the Msg2.
  • the UL grant, the scheduling information includes information such as a transmission resource location, a modulation and coding scheme, and the like.
  • the embodiment of the present invention further provides a random access method on the base station side.
  • the method for solving the problem corresponds to the random access method on the terminal side. Therefore, the implementation of the method can be found on the terminal side. The implementation of the method, the repetition will not be repeated.
  • a base station side random access method is provided in the embodiment of the present invention. As shown in FIG. 8, the method includes the following process:
  • the base station receives the Msg3 sent by the at least two terminals, and generates ACK/NACK feedback corresponding to the Msg3 of the at least two terminals.
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message.
  • the base station determines, according to the correspondence between the RA-RNTI corresponding to the at least two terminals and the RNTI dedicated to the ACK/NACK feedback, that the RA-RNTI corresponding to the at least two terminals is dedicated to the ACK/NACK feedback.
  • the base station scrambles the downlink message by using the determined RNTI dedicated to ACK/NACK feedback, and sends the scrambled downlink message through the downlink control channel.
  • the embodiment of the present invention provides a scheme for transmitting an ACK/NACK feedback of a Msg3 of a downlink control channel for a downlink control channel dedicated to RN/NACK feedback ACK/NACK feedback corresponding to the RA-RNTI of the terminal, and implementing multiple The multicast of the ACK/NACK feedback of the terminal's Msg3 improves the feedback efficiency and saves system resources.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the downlink control channel in S84 is an EPDCCH.
  • the downlink control channel in S84 is transmitted in a common search space.
  • the downlink messages in S82 and S84 are DCIs dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N Each information field in each information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the S82 terminal base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals into the downlink message, and includes the following three preferred implementation manners:
  • the first method corresponds to the foregoing method 1, and specifically:
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message according to the location of the RAR corresponding to the at least two terminals in the Msg2;
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the Msg2, and the Msg2 is scrambled by the RA-RNTI (that is, the scrambling initialization of the PDSCH carrying the Msg2)
  • the PDCCH/EPDCCH ie, the PDCCH/EPDCCH carrying the Msg2 scheduling information, the scheduling information used to indicate the transmission resource and the transmission mode of the Msg2, etc.
  • the Msg2 is also used to also use the RA-RNTI plus Disturb.
  • the second method corresponds to the foregoing method 2, and specifically:
  • the base station maps the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink message according to the identifier information of the preamble sequence of the at least two terminals;
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the third method corresponds to the foregoing method 3, and specifically:
  • the base station corresponds to the Msg3 of the at least two terminals according to at least one of the PRB used by the at least two terminals to transmit the Msg3, the narrowband information in which the Msg3 is transmitted, and the pilot cyclic shift information used to transmit the Msg3.
  • the ACK/NACK feedback is mapped into the downlink message.
  • the method further includes:
  • the base station indicates according to the RAR grant of the terminal whose NACK is NACK corresponding to the ACK/NACK feedback.
  • Scheduling information, re-receiving Msg3 retransmitted by the ACK/NACK feedback NACK terminal, the RAR grant is the UL grant carried in the RAR of the terminal transmitted by the eNB in Msg2, and the scheduling information includes the transmission resource location, modulation and coding mode, and the like. information.
  • the base station maps the received ACK/NACK feedback corresponding to the Msg3 retransmitted by the terminal to the downlink message, where the last ACK/ corresponding to the Msg3
  • the ACK/NACK feedback corresponding to the ACK/NACK feedback of the terminal whose NACK feedback is ACK is set to 0 as the placeholder information.
  • the terminal is in the subframes n1 to n2 (including at least one subframe, whether the PRACH is repeatedly transmitted and the number of repeated transmissions is matched, and the concept of the following subframe interval is similar here), in the same PRACH time-frequency domain resource
  • the terminal 1 repeatedly transmits the preamble 1 (that is, the preamble sequence number is preamble 1), and the terminal 2 repeatedly transmits the preamble 2 (that is, the preamble sequence number is preamble 2).
  • the terminal 3 repeatedly transmits the preamble 3 (that is, the preamble sequence number is preamble 3).
  • the base station receives the preamble sequence on the corresponding PRACH time-frequency domain resource, and combines the preamble sequences in the multiple subframes to obtain the preamble1 sent by the terminal 1, the terminal 2, and the terminal 3 respectively.
  • RA-RNTI 1+t_id+10*f_id, where: t_id is the number of the first subframe corresponding to the specific PRACH resource, 0 ⁇ t_id ⁇ 10; f_id The number of a specific PRACH resource in a subframe is numbered in ascending order of frequency domain, 0 ⁇ f_id ⁇ 6, and the same RA-RNTI-1 is calculated; in the subframes n3 to n4, the base station passes through the downlink in the common search space.
  • the control channel repeatedly transmits a Downlink grant (DL grant) that is scrambled by the RA-RNTI-1, and in the subframes n5 to n6, according to the RA-RNTI-1
  • DL grant Downlink grant
  • the scheduling information in the downlink control channel is scrambled, and the RAR message carrying at least the terminals 1 and 2 and the terminal 3 is repeatedly transmitted on the downlink shared channel, and the mapping manner of the RAR of the different terminal in the downlink shared channel is performed.
  • DL grant Downlink grant
  • the terminal 1, the terminal 2, and the terminal 3 determine the RA-RNTI in the same manner as the above-mentioned base station; in the subframes n3 to n4, in the common search space, detect the downlink control channel scrambled by the RA-RNTI-1, and merge Obtaining the scheduling information carried by the downlink control channel according to the information in the multiple subframes, and receiving the RAR through the downlink shared channel in the subframes n5 to n6 according to the scheduling information, and combining the information in the multiple subframes to obtain the downlink shared channel.
  • the terminal 1 determines that its RAR is in the first position, that is, the MAC RAR1 in FIG.
  • the terminal 2 determines that its RAR is in the second position, that is, the MAC RAR2 in FIG. 3, and the terminal 3 determines that its RAR is in the third position, that is, the MAC RAR3 in FIG. 3, and the RAR order of other terminals and so on.
  • the terminal 1, the terminal 2, and the terminal 3 respectively repeat the transmission of the respective Msg3 in the subframes n7 to n8 according to the scheduling information of the UL grant carried in the respective RARs determined in the Msg2, for example, the terminal 1 is in the subband 1 PRB2 transmission, using Modulation and Coding Scheme (MCS) 1, terminal 2 transmission in PRB3 in subband 1, using MCS2, terminal 3 transmitting in PRB5 in subband 1, using MCS3, one of the subbands
  • MCS Modulation and Coding Scheme
  • the PRB in the middle is shown in Figure 6; the way of shifting in different sub-bands and using the same or different DMRS cyclic shifts is not excluded.
  • the base station also receives the Msg3 of each terminal in the subframes n7 to n8 according to the scheduling information of the UL grant corresponding to the terminal 1, the terminal 2, and the terminal 3, respectively, and obtains the final Msg3 message, and generates the Msg3 of each terminal.
  • ACK/NACK feedback mapped to a specific location in the DCI dedicated to transmitting ACK/NACK feedback in a specific order: for example, mapping ACK/NACK according to the order of each terminal RAR, as shown in FIG. 4, or as shown in FIG.
  • the ACK/NACK information of each terminal corresponds to an indication field, which is used to indicate the number of the preamble sequence of different terminals, or to be sequentially mapped according to the PRB number from small to large (also from large to small).
  • Different sub-bands The mapping may be performed in the same DCI, as shown in FIG. 7; the base station determines the RA-RNTI according to the correspondence between the RA-RNTI-1 and the RNTI (hereinafter referred to as AN-RNTI) dedicated to ACK/NACK feedback.
  • the base station in the subframes n9 to n10, the base station repeatedly transmits the downlink control channel scrambled by the AN-RNTI-1 in the common search space, and the downlink control channel carries the dedicated bearer for the bearer
  • the DCI of the ACK/NACK feedback corresponding to the Msg3 of the terminal.
  • the terminal 1, the terminal 2, and the terminal 3 determine the AN-RNTI-1 in the same manner as the base station side, and in the subframes n9 to n10, detect the downlink control using the AN-RNTI-1 scrambling in the common search space.
  • the channel combines the information in the multiple subframes to obtain the DCI carrying the ACK/NACK feedback, and determines the specific location of the feedback information in the DCI according to the method consistent with the ACK/NACK feedback of the base station side mapping; further determining whether the feedback information is based on the feedback information Retransmission, if it is ACK, Msg3 accepts correctly and does not need to retransmit. Otherwise, in subframes n11 ⁇ n12, the Msg3 (ie, non-adaptive retransmission) is retransmitted according to the scheduling information of the first Msg3 transmission.
  • the feedback information of the terminal 1 is ACK
  • the feedback of the terminal 2 and the terminal 3 is NACK
  • the terminal 2 and the terminal 3 need to retransmit the Msg3; the base station repeats the steps in the above 2) to receive the Msg3 of the terminal 2 and the terminal 3.
  • the information is transmitted, and ACK/NACK feedback is generated, and is mapped to the DCI in the same manner, that is, the mapping position of the ACK/NACK feedback of the terminal 2 and the terminal 3 in the DCI does not change.
  • the ACK/NACK feedback of the corresponding terminal 1 in the DCI can be set to 0 as the placeholder information; correspondingly, on the terminal side, the terminal 1 no longer needs to listen to the downlink control channel scrambled by the AN-RNTI-1, Terminal 2 and terminal 3 also need to obtain the ACK/NACK feedback of their Msg3 retransmission according to the same steps in 3) above, and so on, until the Msg3 transmission is correct or the maximum number of retransmissions of Msg3 is reached.
  • the above method processing flow can be implemented by a software program, which can be stored in a storage medium, and when the stored software program is called, the above method steps are performed.
  • a terminal is provided in the embodiment of the present invention.
  • the principle of solving the problem is similar to the random access method on the terminal side shown in FIG. 2, so the implementation of the terminal can be seen in the figure.
  • the implementation of the method shown in 2 will not be repeated here.
  • a terminal provided by the embodiment of the present invention, as shown in FIG. 9, the terminal includes:
  • the determining module 91 is configured to determine, according to the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback, the RNTI dedicated to the ACK/NACK feedback corresponding to the RA-RNTI of the terminal to which the UE belongs.
  • the downlink message obtaining module 92 is configured to detect the downlink control channel by using the RNTI dedicated to ACK/NACK feedback to obtain a downlink message for carrying the ACK/NACK feedback corresponding to the Msg3.
  • the processing module 93 is configured to obtain ACK/NACK feedback of the terminal Msg3 from the downlink message according to the location of the ACK/NACK corresponding to the Msg3 of the terminal in the downlink message.
  • the processing module 93 before the processing module 93 obtains the ACK/NACK feedback of the terminal Msg3 from the downlink message, the processing module 93 is further configured to:
  • the processing module 93 is specifically configured to:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the processing module 93 is specifically configured to:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the processing module 93 is specifically configured to:
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the terminal further includes:
  • a retransmission module (not shown in the figure), configured to retransmit the Msg3 of the terminal according to scheduling information indicated by the RAR grant corresponding to the terminal when the ACK/NACK feedback of the Msg3 of the terminal is NACK .
  • a base station is further provided in the embodiment of the present invention.
  • the principle of the base station solving the problem is similar to the random access method on the base station side shown in FIG. 8 above. Therefore, the implementation of the base station can be seen in the figure. The implementation of the method shown in Fig. 8 will not be repeated here.
  • the receiving module 101 is configured to receive Msg3 sent by at least two terminals;
  • the feedback information generating module 102 is configured to generate ACK/NACK feedback corresponding to the Msg3 of the at least two terminals;
  • the mapping module 103 is configured to map the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals into the downlink message;
  • the determining module 104 is configured to determine, according to the correspondence between the RA-RNTI corresponding to the at least two terminals and the RNTI dedicated to the ACK/NACK feedback, the RNTI dedicated to the ACK/NACK feedback corresponding to the RA-RNTI;
  • a sending module 105 configured to use the RNTI dedicated to ACK/NACK feedback
  • the line message is scrambled, and the scrambled downlink message is sent through the downlink control channel.
  • mapping module 103 is specifically configured to:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • mapping module 103 is specifically configured to:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • mapping module 103 is specifically configured to:
  • Msg3 corresponding to the at least two terminals according to at least one of the PRB used by the at least two terminals to transmit the Msg3, the narrowband information in which the Msg3 is transmitted, and the pilot cyclic shift information used to transmit the Msg3
  • the ACK/NACK feedback is mapped into the downlink message.
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N information fields, and the N pieces Each information field in the information domain is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the receiving module 101 is further configured to:
  • the terminal provided by the embodiment of the present invention includes a transceiver 111 and at least one processor 112 connected to the transceiver 111, where:
  • the processor 112 is configured to read a program in the memory 113 and perform the following process:
  • the transceiver 111 is configured to receive and transmit data under the control of the processor 112.
  • bus 110 may include any number of interconnected buses and bridges, and bus 110 will include one or more processors and memory 113 represented by general purpose processor 112. The various circuits of the memory are linked together.
  • the bus 110 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein.
  • Bus interface 114 provides an interface between bus 110 and transceiver 111.
  • the transceiver 111 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. For example, the transceiver 111 receives external data from other devices.
  • the transceiver 111 is configured to transmit the processed data of the processor 112 to other devices.
  • a user interface 115 can also be provided, such as a keypad, display, speaker, microphone, joystick.
  • the processor 112 is responsible for managing the bus 110 and the usual processing, running a general purpose operating system as described above.
  • the memory 113 can be used to store data used by the processor 112 when performing operations.
  • the processor 112 may be a central processing unit (CPU) or an application specific integrated circuit (ASIC). Field Programmable Gate Array (FPGA), or Complex Programmable Logic Device (CPLD).
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • CPLD Complex Programmable Logic Device
  • the processor 112 obtains the ACK/NACK feedback of the terminal Msg3 from the downlink message.
  • the following process is also performed:
  • the determining, by the processor 112, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message includes:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the determining, by the processor 112, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message includes:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the determining, by the processor 112, the location of the ACK/NACK feedback corresponding to the Msg3 of the terminal in the downlink message includes:
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback.
  • the DCI includes M bit information, and the M bit information is divided into N information fields, and each of the N information fields is used to carry an ACK/NACK feedback, where M And N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the transceiver 111 also performs the following processes:
  • the Msg3 of the terminal is retransmitted according to the scheduling information indicated by the RAR grant corresponding to the terminal.
  • a base station provided by an embodiment of the present invention includes a transceiver 121 and at least one processor 122 connected to the transceiver 121, where:
  • the processor 122 is configured to read a program in the memory 123 and perform the following process:
  • bus 120 may include any number of interconnected buses and bridges, and bus 120 will include one or more processors represented by processor 122 and memory represented by memory 123.
  • the various circuits are linked together.
  • the bus 120 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein.
  • Bus interface 124 provides an interface between bus 120 and transceiver 121.
  • the transceiver 121 can be a component or Thus, a plurality of components, such as a plurality of receivers and transmitters, provide means for communicating with various other devices on a transmission medium.
  • Data processed by processor 122 is transmitted over wireless medium via antenna 125. Further, antenna 125 also receives the data and transmits the data to processor 122.
  • the processor 122 is responsible for managing the bus 120 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the memory 123 can be used to store data used by the processor 122 when performing operations.
  • the processor 122 can be a CPU, an ASIC, an FPGA, or a CPLD.
  • the processor 122 specifically performs the following processes:
  • the ACK/NACK feedback corresponding to the Msg3 of the different terminals is sorted in the downlink message in the same manner as the RAR corresponding to the terminal in the RAR message, and the RAR message is scrambled by the RA-RNTI.
  • the processor 122 specifically performs the following processes:
  • the A bit information before the location of each ACK/NACK feedback in the downlink message or the subsequent A bit information is the identification information of the preamble sequence of the terminal corresponding to the ACK/NACK feedback, and A is a natural number.
  • the processor 122 specifically performs the following processes:
  • Msg3 corresponding to the at least two terminals according to at least one of the PRB used by the at least two terminals to transmit the Msg3, the narrowband information in which the Msg3 is transmitted, and the pilot cyclic shift information used to transmit the Msg3
  • the ACK/NACK feedback is mapped into the downlink message.
  • the downlink control channel is an EPDCCH.
  • the downlink message is a DCI dedicated to transmitting ACK/NACK feedback, where the DCI includes M bit information, and the M bit information is divided into N pieces of information. Each of the N information fields is used to carry an ACK/NACK feedback, where M and N are integers greater than or equal to 1.
  • the downlink control channel is transmitted in a common search space.
  • the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback is predefined by the terminal and the base station, or is notified to the terminal by the base station through a system message.
  • the transceiver 121 also performs the following processes:
  • the Msg3 retransmitted by the terminal whose ACK/NACK feedback is NACK is re-received according to the scheduling information indicated by the RAR grant of the terminal whose ACK/NACK feedback is NACK.
  • an embodiment of the present invention further provides a communication system. As shown in FIG. 13, the system includes:
  • the base station 131 is configured to receive the Msg3 sent by the at least two terminals, and generate ACK/NACK feedback corresponding to the Msg3 of the at least two terminals, and map the ACK/NACK feedback corresponding to the Msg3 of the at least two terminals to the downlink. And determining, according to the correspondence between the RA-RNTI corresponding to the at least two terminals and the RNTI dedicated to the ACK/NACK feedback, the RNTI dedicated to the ACK/NACK feedback corresponding to the RA-RNTI; The RNTI dedicated to the ACK/NACK feedback scrambles the downlink message, and sends the scrambled downlink message through the downlink control channel;
  • the terminal 132 is configured to determine, according to the correspondence between the RA-RNTI and the RNTI dedicated to the ACK/NACK feedback, the RNTI dedicated to the ACK/NACK feedback corresponding to the RA-RNTI of the terminal; and use the dedicated ACK/NACK
  • the RNTI of the feedback detects the downlink control channel to obtain a downlink message for carrying the ACK/NACK feedback corresponding to the Msg3; and the position of the ACK/NACK corresponding to the Msg3 of the terminal in the downlink message, from the downlink Obtaining ACK/NACK feedback of the terminal's Msg3 in the message.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention may employ computer-usable storage media (including but not limited to disks) in one or more of the computer-usable program code embodied therein. The form of a computer program product implemented on a memory, CD-ROM, optical memory, or the like.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明公开了一种随机接入方法、设备和系统，用于解决覆盖增强场景下，若针对每个终端的Msg3都采用一个独立的UL grant进行ACK/NACK反馈，会导致反馈开销较大的问题。方法包括：终端根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出该终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用该专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；根据该终端的Msg3对应的ACK/NACK反馈在该下行消息中的位置，从该下行消息中获取该终端的Msg3的ACK/NACK反馈，从而节省了系统资源。

Description

一种随机接入方法、设备和系统
本申请要求在2015年8月11日提交中国专利局、申请号为201510491483.4、发明名称为“一种随机接入方法、设备和系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，特别涉及一种覆盖增强场景下的随机接入方法、设备和系统。
背景技术
竞争随机接入是指基站(eNodeB，简称eNB)没有为终端(User Terminal，又称用户设备，User Equipment，UE)分配专用资源，完全由终端随机发起的随机接入过程。竞争随机接入适用于所有五种场景：对于无线资源控制(Radio Resource Control，简称RRC)连接建立、RRC连接重建和上行数据到达的场景，随机接入完全是由终端自发的，eNB没有任何先验信息；对于切换和下行数据到达场景，终端根据eNB指示发起随机接入，一般说来，eNB会优先选择非竞争随机接入，只有在非竞争随机接入资源不够分配的情况下，才会指示终端发起竞争随机接入。竞争随机接入过程分四步完成，如图1所示，每一步称为一条消息(Message，简称Msg)，将这四个步骤称为Msg1～Msg4。其中：
(1)Msg1：前导(preamble)序列
该消息为上行消息，由终端发送，eNB接收，承载在物理随机接入信道(Physical Random Access Channel，简称PRACH)中发送。对于竞争随机接入，终端发送的preamble序列是在特定preamble集合中随机选择的一个，不同preamble序列的具有不同的标识信息，即前导索引(preamble index)。
(2)Msg2：随机接入响应(Random Access Response，简称RAR)
该消息为下行消息，由eNB发送，终端接收。
Msg2是eNB在接收到Msg1之后对终端发起的随机接入的响应，必须在随机接入响应窗中发送。随机接入响应窗起点为满足n+3的第一个可用下行子帧，n为preamble序列发送的最后一个子帧，长度为2～10ms，由eNB在系统消息中指定。
Msg2在媒体接入控制(Media Access Control，简称MAC)层定义的下行共享信道(Downlink Shared Channel，简称DL-SCH)承载，在物理层对应物理下行共享信道(Physical Downlink Shared Channel，简称PDSCH)。一条Msg2可以响应多个终端的随机接入请求，即同时承载多个终端的RAR，因此Msg2没有混合自动重传请求(Hybrid Automatic Repeat reQuest，简称HARQ)过程，即没有反馈重传过程。
eNB用由在公共搜索空间中传输的随机接入无线网络临时标识(Random Access Radio Network Temporary Identifier，简称RA-RNTI)加扰的物理下行控制信道(Physical Downlink Control Channel，简称PDCCH)调度Msg2，RA-RNTI由发送Msg1的PRACH时频资源位置确定；使用相同PRACH时频资源的终端计算得到相同的RA-RNTI，其RAR信息打包在同一个RAR消息中发送，该RAR消息承载在由该RA-RNTI加扰的PDCCH调度的下行共享信道中传输，且该下行共享信道也使用该RA-RNTI进行加扰。
Msg2中的内容包括：回退(backoff)参数、与Msg1对应的preamble序列的标识信息、上行传输定时提前量(TA)、Msg3的上行调度许可(UL grant，在物理层又称为RAR grant)、临时(Temporary)小区级无线网络临时标识(Cell-Radio Network Temporary Identifier，简称C-RNTI)，简称TC-RNTI。其中，backoff参数用于指示如果本次随机接入失败，终端下次发起随机接入的时延均值。
终端通过自身在Msg1中发送preamble序列所使用的PRACH时频域资源确定的RA-RNTI，识别承载自身RAR的RAR消息(即在DL-SCH中发送的Msg2)，在该RAR消息中根据自身在Msg1中发送的preamble序列的标识信 息确定发送给自己的RAR。如果终端没有正确接收到Msg2，则依据backoff参数的时延限制确定下一次发起随机接入的时延，另外选择随机接入资源发起下一次随机接入。达到最大随机接入次数后，终端的MAC层向RRC层上报随机接入问题，触发无线链路失败(Radio Link Failure，简称RLF)过程。
(3)Msg3：第一次调度上行传输
该消息为上行消息，由终端发送，eNB接收。
终端在接收到Msg2后，在获得的自身的RAR中所包含的UL grant(即RAR grant)所指示的上行资源上进行的上行传输，即根据自身的RAR grant中的调度信息传输物理上行共享信道(Physical Uplink Shared Channel，简称PUSCH)，该PUSCH对应MAC层的上行共享信道(Uplink Shared Channel，简称UL-SCH)。采用HARQ过程，上行资源最小可以传输56比特。
Msg3的初始传输是唯一由MAC层动态调度的上行传输，需要MAC层处理，因此Msg3与Msg2至少间隔6ms，其他Msg3的重传都是由PDCCH完成的，该PDCCH在公共搜索空间中传输，且使用TC-RNTI加扰。
针对不同的场景，Msg3中包含不同的内容：
初始接入：携带RRC层生成的RRC连接请求消息，不包含非接入层(Non Access Stratum，简称NAS)消息；在MAC层对应的逻辑信道为公共控制信道(Common Control Channel，简称CCCH)传输；
连接重建：携带RRC层生成的RRC连接重建请求，不包含NAS消息；在MAC层对应的逻辑信道为CCCH；
切换：传输RRC层生成的RRC切换完成消息，在MAC层对应的逻辑信道为用专属控制信道(Dedicate Control Channel，简称DCCH)；传输终端的C-RNTI；如果资源足够，可以包含上行缓存状态报告(BSR)；
上下行数据到达：至少传输终端的C-RNTI。
(4)Msg4：竞争解决
该消息为下行消息，由eNB发送，终端接收。
eNB和终端通过Msg4完成最终的竞争解决。Msg4的内容是与Msg3的 内容相对应的。
随着物联网的兴起，在长期演进系统(Long Term Evolution，简称LTE)系统中支持机器类通信(Machine Type Communication，简称MTC)越来越受到重视。在3GPP Release 13立项了针对MTC的物理层增强项目。一台MTC设备(也称为MTC终端)可能具有多种机器与机器(Machine to Machine，简称M2M)通信特性中的部分特性，如低移动性、传输数据量小、对通信时延不敏感、要求极低功耗等。
现有网络中，运营商发现某些场景下工作的终端，比如工作于地下室、商场或者建筑角落的终端，由于无线信号被严重遮挡，信号受到很大的衰减，无法与网络进行通信，而针对这些场景下进行网络的深度覆盖会大大增加网络的建网成本。经过测试，认为需要对现有覆盖进行一定程度的增强。实现覆盖增强，一种较为可行的方法是对现有信道采用重复传输或类似技术，理论上可以通过对现有物理信道进行几十次至几百次重复传输获得一定程度的覆盖增益。
在进行覆盖增强传输时，为了提高传输性能，需要进行多次重复传输。对于上述随机接入过程，每个步骤中的消息的调度信令和消息本身以及相应的反馈信息都需要进行重复传输。对于公共搜索空间，大量的重复传输导致不能支持多个终端同时进行控制信息传输；另一方面，MTC系统中已经确定不支持物理混合重传指示信道(Physical Hybrid-ARQ Indicator Channel，简称PHICH)传输，若针对每个Msg3都采用一个独立的UL grant进行肯定确认(ACKnowledgement，简称ACK)/否定确认(Negative ACKnowledgement，简称NACK)反馈，由于UL grant主要用于调度数据传输，其中包含大量与数据传输相关的信息域，如资源分配、调制等级等信息，UL grant中仅1比特的新信息指示域是用来反馈ACK/NACK的，因此，即使仅需要反馈ACK/NACK而不需要指示资源分配、调制等级等信息，也需要重复发送一次UL grant，反馈开销较大，需要考虑对Msg3的ACK/NACK反馈设计新的反馈方式，以提高反馈效率，节省资源开销。
发明内容
本发明实施例提供了一种随机接入方法、设备和系统，用于解决覆盖增强场景下，若针对每个终端的Msg3都采用一个独立的UL grant进行ACK/NACK反馈，会导致反馈开销较大的问题。
本发明实施例提供的一种随机接入方法，包括：
终端根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
所述终端使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；
所述终端根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
在实施中，所述终端从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之前，还包括：
所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
在实施中，作为第一种优选的实现方式，所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
所述终端根据所述终端的随机接入响应RAR在RAR消息中的位置，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
所述终端根据所述终端的前导preamble序列的标识信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比 特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
所述终端根据所述终端传输Msg3所使用的物理资源块PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为所述终端和基站预先定义的，或者由基站通过系统消息通知给所述终端。
基于上述任一实施例，所述终端从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之后，还包括：
若所述终端的Msg3的ACK/NACK反馈为NACK，所述终端按照所述终端对应的RAR许可grant所指示的调度信息，重新传输所述终端的Msg3。
本发明实施例提供的另一种随机接入方法，包括：
基站接收到至少两个终端发送的Msg3，并产生所述至少两个终端的Msg3对应的ACK/NACK反馈；
所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
所述基站根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于 ACK/NACK反馈的RNTI；
所述基站使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息。
在实施中，作为第一种优选的实现方式，所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到所述下行消息中，包括：
所述基站根据所述至少两个终端对应的RAR在RAR消息中的位置，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到所述下行消息中，包括：
所述基站根据所述至少两个终端的preamble序列的标识信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到所述下行消息中，包括：
所述基站根据所述至少两个终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，该方法还包括：
所述基站按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的调度信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3。
本发明实施例提供的一种终端，包括：
确定模块，用于根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出自身所属的终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
下行消息获取模块，用于使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；
处理模块，用于根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
在实施中，所述处理模块从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之前，还用于：
确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
在实施中，作为第一种优选的实现方式，所述处理模块，具体用于：
根据所述终端的随机接入响应RAR在RAR消息中的位置，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述处理模块，具体用于：
根据所述终端的前导preamble序列的标识信息，确定出所述终端的Msg3 对应的ACK/NACK反馈在所述下行消息中的位置；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述处理模块，具体用于：
根据所述终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为所述终端和基站预先定义的，或者由基站通过系统消息通知给所述终端。
基于上述任一实施例，所述终端还包括：
重传模块，用于在所述终端的Msg3的ACK/NACK反馈为NACK时，按照RAR grant所指示的调度信息，重新传输所述终端的Msg3。
本发明实施例提供的一种基站，包括：
接收模块，用于接收到至少两个终端发送的Msg3；
反馈信息生成模块，用于产生所述至少两个终端的Msg3对应的ACK/NACK反馈；
映射模块，用于将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
确定模块，用于根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于 ACK/NACK反馈的RNTI；
发送模块，用于使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息。
在实施中，作为第一种优选的实现方式，所述映射模块具体用于：
根据所述至少两个终端对应的RAR在RAR消息中的位置，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述映射模块具体用于：
根据所述至少两个终端的preamble序列的标识信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述映射模块具体用于：
根据所述至少两个终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，所述接收模块还用于：
按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的调度信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3。
本发明实施例提供的另一种终端，包括：收发机、以及与所述收发机连接的至少一个处理器，其中：
所述处理器，用于读取存储器中的程序，执行下列过程：
根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出自身所属的终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈；
所述收发机，用于在所述处理器的控制下接收和发送数据。
在实施中，所述处理器从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之前，还执行下列过程：
确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
在实施中，作为第一种优选的实现方式，所述处理器执行确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
根据所述终端的随机接入响应RAR在RAR消息中的位置，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述处理器执行确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
根据所述终端的前导preamble序列的标识信息，确定出所述终端的Msg3 对应的ACK/NACK反馈在所述下行消息中的位置；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述处理器执行确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
根据所述终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，所述收发机还执行下列过程：
在所述终端的Msg3的ACK/NACK反馈为NACK时，按照所述终端对应的RAR grant所指示的调度信息，重新传输所述终端的Msg3。
本发明实施例提供的另一种基站，包括：收发机、以及与该收发机连接的至少一个处理器，其中：
处理器，用于读取存储器中的程序，执行下列过程：
通过收发机接收到至少两个终端发送的Msg3，产生所述至少两个终端的Msg3对应的ACK/NACK反馈；将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述 RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并控制所述收发机通过下行控制信道，发送加扰后的下行消息。
在实施中，作为第一种优选的实现方式，所述处理器具体执行下列过程：
根据所述至少两个终端对应的RAR在RAR消息中的位置，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述处理器具体执行下列过程：
根据所述至少两个终端的preamble序列的标识信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述处理器具体执行下列过程：
根据所述至少两个终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，所述收发机还执行下列过程：
按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的调度信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3。
本发明实施例提供的一种通信系统，包括：
基站，用于接收到至少两个终端发送的Msg3，并产生所述至少两个终端的Msg3对应的ACK/NACK反馈；将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息；
终端，用于根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
本发明实施例提供了一种通过与终端的RA-RNTI一一对应的专用于ACK/NACK反馈的RNTI加扰的下行控制信道传输终端的Msg3的ACK/NACK反馈的方案，实现了对多个终端的Msg3的ACK/NACK反馈的组播，从而提高了反馈效率，节省了系统资源。
附图说明
图1为现有技术中竞争随机接入过程的流程示意图；
图2为本发明实施例提供的一种终端侧的随机接入方法的示意图；
图3为本发明实施例提供的承载RAR的下行共享信道中不同终端的RAR的映射方式的示意图；
图4为本发明实施例提供的第一种终端的Msg3对应的ACK/NACK反馈在下行消息中的映射方式的示意图；
图5为本发明实施例提供的第二种终端的Msg3对应的ACK/NACK反馈在下行消息中的映射方式的示意图；
图6为本发明实施例提供的终端传输Msg3时使用的PRB的示意图；
图7为本发明实施例提供的第三种终端的Msg3对应的ACK/NACK反馈在下行消息中的映射方式的示意图；
图8为本发明实施例提供的一种终端侧的随机接入方法的示意图；
图9为本发明实施例提供的第一种终端的示意图；
图10为本发明实施例提供的第一种基站的示意图；
图11为本发明实施例提供的第二种终端的示意图；
图12为本发明实施例提供的第二种基站的示意图；
图13为本发明实施例提供的通信系统的示意图。
具体实施方式
下面结合说明书附图对本发明实施例作进一步详细描述。应当理解，此处所描述的实施例仅用于说明和解释本发明，并不用于限定本发明。
本发明实施例提供的一种终端侧的随机接入方法，如图2所示，该方法包括如下过程：
S21、终端根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出该终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
S22、终端使用确定出的专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；
S23、终端根据该终端的Msg3对应的ACK/NACK反馈在该下行消息中的位置，从该下行消息中获取该终端的Msg3的ACK/NACK反馈。
本发明实施例中，终端根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出该终端的RA-RNTI对应的专用于ACK/NACK反馈的 RNTI；使用确定出的专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；根据该终端的Msg3对应的ACK/NACK反馈在该下行消息中的位置，从该下行消息中获取该终端的Msg3的ACK/NACK反馈。本发明实施例提供了一种通过与终端的RA-RNTI一一对应的专用于ACK/NACK反馈的RNTI加扰的下行控制信道传输终端的Msg3的ACK/NACK反馈的方案，实现了对多个终端的Msg3的ACK/NACK反馈的组播，从而提高了反馈效率，节省了系统资源。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端，如通过系统信息块(System Information Block，简称SIB)通知。
具体的，本发明实施例不限定RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系的具体实现方式，该对应关系可以采用表1所示的对应关系列表实现；
表1
RA-RNTI AN-RNTI(专用于ACK/NACK反馈的RNTI)
RA-RNTI-1 AN-RNTI-1
RA-RNTI-2 AN-RNTI-2
RA-RNTI-3 AN-RNTI-3
RA-RNTI-4 AN-RNTI-4
RA-RNTI-5 AN-RNTI-5
RA-RNTI-6 AN-RNTI-6
RA-RNTI-7 AN-RNTI-7
RA-RNTI-8 AN-RNTI-8
RA-RNTI-9 AN-RNTI-9
RA-RNTI-10 AN-RNTI-10
…… ……
该对应关系也可以采用如下公式的方式实现：AN-RNTI＝RA-RNTI+X，其中，AN-RNTI表示专用于ACK/NACK反馈的RNTI，X表示RA-RNTI偏移值。
本发明实施例中，S22中所检测的下行控制信道为增强物理下行控制信道(Enhanced PDCCH，简称EPDCCH)。
本发明实施例中，S22中所检测的下行控制信道在公共搜索空间中传输。
本发明实施例中的，S22中获取到的下行消息为专用于传输ACK/NACK反馈的下行控制信息(Downlink Control Information，简称DCI)，其中，该DCI包含M个比特信息，该M个比特信息被划分为N个信息域，该N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
具体的，下行消息总是按照固定大小发送，例如总是按照M个比特发送，其中M个比特被划分为N个区域，该N个区域中的每个区域用于承载一个ACK/NACK反馈，在一次发送中，该下行消息中实际承载的ACK/NACK反馈的个数，与Msg2中使用RA-RNTI加扰的且在同一个物理下行共享信道中传输的RAR的个数(即使用RA-RNTI加扰的且在同一个物理下行共享信道中传输RAR的终端个数)相同。如果传输的RAR个数不足N个，那么N个区域中的其他区域置为0占位，表示无信息。
在实施中，S23中，终端从下行消息中获取该终端的Msg3的ACK/NACK反馈之前，还包括：
终端确定出该终端的Msg3对应的ACK/NACK反馈在下行消息中的位置。
进一步，终端确定出该终端的Msg3对应的ACK/NACK反馈在下行消息 中的位置，包括以下三种优选的实现方式：
方式1、终端根据该终端的RAR在RAR消息(后续简称为Msg2)中的位置，确定出该终端的Msg3对应的ACK/NACK反馈在下行消息中的位置。
其中，不同终端的Msg3对应的ACK/NACK反馈在下行消息中的排序方式与该终端对应的RAR在Msg2中的排序方式相同，Msg2由该终端的RA-RNTI加扰(即承载Msg2的PDSCH的加扰初始化由RA-RNTI确定)；另外，调度该Msg2的PDCCH/EPDCCH(即承载该Msg2调度信息的PDCCH/EPDCCH，调度信息用于指示Msg2的传输资源和传输方式等信息)也使用该RA-RNTI加扰。
举例说明，假设使用相同PRACH时频域资源(即确定的RA-RNTI相同)的不同终端的RAR在物理下行共享信道所承载的包含多个终端的RAR的RAR消息中的映射方式如图3所示，其中，终端1的RAR在第1个位置，即图3中的MAC RAR1，终端2的RAR在第2个位置，即图3中的MAC RAR2，终端3的RAR在第3个位置，即图3中的MAC RAR3，其他终端的RAR排序以此类推。该不同终端的Msg3对应的ACK/NACK反馈在下行消息中的映射方式与该终端对应的RAR在Msg2中的排序方式相同，承载不同终端的Msg3对应的ACK/NACK反馈的下行消息如图4所示，终端1的Msg3对应的ACK/NACK反馈在第1个位置，终端2的Msg3对应的ACK/NACK反馈在第2个位置，终端3的Msg3对应的ACK/NACK反馈在第3个位置，其他终端的Msg3对应的ACK/NACK反馈的排序以此类推。
方式2、终端根据该终端的preamble序列的标识信息，确定出该终端的Msg3对应的ACK/NACK反馈在下行消息中的位置。
其中，下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
举例说明，该下行消息中每个终端的ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为一个指示域，该指示域用于指示该终 端的preamble序列的标识信息(如preamble序列的编号、索引等)，如图5所示，终端1的Msg3对应的ACK/NACK反馈之前的A个比特信息的指示域指示终端1的preamble序列的索引，即preamble index1；终端2的Msg3对应的ACK/NACK反馈之前的A个比特信息的指示域指示终端2的preamble序列的索引，即preamble index2；终端3的Msg3对应的ACK/NACK反馈之前的A个比特信息的指示域指示终端3的preamble序列的索引，即preamble index3，其他终端的Msg3对应的ACK/NACK反馈以此类推。
方式3、终端根据该终端传输Msg3所使用的物理资源块(Physical Resource Block，PRB)、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出该终端的Msg3对应的ACK/NACK反馈在下行消息中的位置。
具体的，不同终端的Msg3对应的ACK/NACK反馈在下行消息中的位置的排序为该不同终端传输Msg3所使用的PRB的编号从大到小或从小到大的顺序。由于在定义承载不同终端的Msg3对应的ACK/NACK反馈的下行消息时，是按照系统中的所有窄带位置顺序定义的，那么终端使用了哪个窄带传输其Msg3，则该终端的Msg3对应的ACK/NACK反馈就映射在该下行消息中的对应的位置上。不同终端的Msg3对应的ACK/NACK反馈在下行消息中的位置的排序与该不同终端传输Msg3所使用的导频循环移位信息的顺序一致。
举例说明，假设终端1～终端6传输Msg3所使用的PRB为同一个子带中的PRB1～PRB6，如图6所示，终端也可以使用不同子带中的PRB，本发明实施例不对此进行限定；基站按照PRB的编号从小到大的顺序，将终端1～终端6的Msg3对应的ACK/NACK反馈映射在下行消息中，如图7所示，使用PRB1的终端1的Msg3对应的ACK/NACK反馈在第1个位置，使用PRB2的终端2的Msg3对应的ACK/NACK反馈在第2个位置，使用PRB3的终端3的Msg3对应的ACK/NACK反馈在第3个位置，其他终端的Msg3对应的ACK/NACK反馈的排序以此类推。
基于上述任一实施例，S23中终端从下行消息中获取该终端的Msg3的ACK/NACK反馈之后，还包括：
若终端的Msg3的ACK/NACK反馈为NACK，该终端按照该终端对应的RAR grant所指示的调度信息，重新传输该终端的Msg3，该RAR grant即该终端在Msg2中获得的自身RAR中所携带的UL grant，调度信息包括传输资源位置，调制编码方式等信息。
基于同一发明构思，本发明实施例中还提供了一种基站侧的随机接入方法，由于该方法解决问题的原理与上述终端侧的随机接入方法对应，因此该方法的实施可以参见终端侧方法的实施，重复之处不再赘述。
本发明实施例提供的一种基站侧随机接入方法，如图8所示，该方法包括如下过程：
S81、基站接收到至少两个终端发送的Msg3，并产生该至少两个终端的Msg3对应的ACK/NACK反馈；
S82、基站将该至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
S83、基站根据该至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出该至少两个终端所对应的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
S84、基站使用确定出的专用于ACK/NACK反馈的RNTI对该下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息。
本发明实施例提供了一种通过与终端的RA-RNTI一一对应的专用于ACK/NACK反馈的RNTI加扰的下行控制信道传输终端的Msg3的ACK/NACK反馈的方案，实现了对多个终端的Msg3的ACK/NACK反馈的组播，从而提高了反馈效率，节省了系统资源。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
本发明实施例中，S84中的下行控制信道为EPDCCH。
本发明实施例中，S84中的下行控制信道在公共搜索空间中传输。
本发明实施例中的，S82和S84中的下行消息为专用于传输ACK/NACK反馈的DCI，其中，该DCI包含M个比特信息，该M个比特信息被划分为N个信息域，该N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
在实施中，S82终基站将该至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中，包括以下三种优选的实现方式：
方式一、与上述方式1对应，具体为：
基站根据该至少两个终端对应的RAR在Msg2中的位置，将该至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，不同终端的Msg3对应的ACK/NACK反馈在下行消息中的排序方式与该终端对应的RAR在Msg2中的排序方式相同，Msg2由RA-RNTI加扰(即承载Msg2的PDSCH的加扰初始化由RA-RNTI确定)；另外，调度该Msg2的PDCCH/EPDCCH(即承载该Msg2调度信息的PDCCH/EPDCCH，调度信息用于指示Msg2的传输资源和传输方式等信息)也使用该RA-RNTI加扰。
方式二、与上述方式2对应，具体为：
基站根据该至少两个终端的preamble序列的标识信息，将该至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
方式三、与上述方式3对应，具体为：
基站根据该至少两个终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
基于上述任一实施例，该方法还包括：
基站按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的 调度信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3，该RAR grant即eNB在Msg2中发送的该终端的RAR中所携带的UL grant，调度信息包括传输资源位置，调制编码方式等信息。
进一步，基站接收到ACK/NACK反馈为NACK的终端重新发送的Msg3之后，基站将接收到的终端重传的Msg3对应的ACK/NACK反馈映射到下行消息中，其中，上一次Msg3对应的ACK/NACK反馈为ACK的终端对应的ACK/NACK反馈在下行消息中的位置上的ACK/NACK反馈被置为0，作为占位信息。
下面通过一个完整的随机接入过程，从基站和终端的交互来说明本发明实施例提供的方案。具体过程如下：
(1)Msg1传输：
1)终端在子帧n1～n2(包含至少一个子帧，与PRACH是否重复传输以及重复传输次数匹配，下面的子帧区间的概念与此处类似)中，在相同的PRACH时频域资源上，终端1重复发送了preamble1(即preamble序列的编号为preamble1)，终端2重复发送了preamble2，(即preamble序列的编号为preamble2)终端3重复发送了preamble3(即preamble序列的编号为preamble3)。
2)基站在子帧n1～n2中，在相应的PRACH时频域资源上的接收上述preamble序列，合并多个子帧中的preamble序列，以获得终端1、终端2、终端3分别发送的preamble1、preamble2、preamble 3。
(2)Msg2传输：
1)基站根据相同的PRACH时频域资源，按照公式RA-RNTI＝1+t_id+10*f_id，其中：t_id为特定PRACH资源对应的第一个子帧的编号，0≤t_id<10；f_id为一个子帧内特定PRACH资源的编号，按照频域升序编号，0≤f_id<6，计算得到相同的RA-RNTI-1；基站在子帧n3～n4中，在公共搜索空间中，通过下行控制信道重复发送采用该RA-RNTI-1加扰的下行调度许可(Downlink grant，简称DL grant)，在子帧n5～n6中，根据由该RA-RNTI-1 加扰的下行控制信道中调度信息，在相应的资源上，通过下行共享信道重复发送承载至少终端1、2、终端3的RAR的消息，其中不同终端的RAR在该下行共享信道中的映射方式如图3所示。
2)终端1、终端2和终端3根据上述基站同样方式确定RA-RNTI；在子帧n3～n4中，在公共搜索空间中，检测采用该RA-RNTI-1加扰的下行控制信道，合并多个子帧中的信息，得到该下行控制信道所承载的调度信息，根据该调度信息，在子帧n5～n6中通过下行共享信道接收RAR，合并多个子帧中的信息，得到该下行共享信道所承载的RAR，并在该下行共享信道中根据自身所发送的preamble序列的编号，确定其对应的RAR信息；其中，终端1确定其RAR在第1个位置，即图3中的MAC RAR1，终端2确定其RAR在第2个位置，即图3中的MAC RAR2，终端3确定其RAR在第3个位置，即图3中的MAC RAR3，其他终端的RAR排序以此类推。
(3)Msg3：
第一次传输：
1)终端1、终端2、终端3分别根据在Msg2中确定的各自的RAR中携带的UL grant的调度信息，在子帧n7～n8重复传输各自的Msg3，例如终端1在子带1中的PRB2传输，使用调制编码方式(Modulation and Coding Scheme，简称MCS)1，终端2在子带1中的PRB3传输，使用MCS2，终端3在子带1中的PRB5传输，使用MCS3，其中一个子带中的PRB如图6所示；不排除在不同子带以及采用相同或者不同DMRS循环移位的方式。
2)相应的，基站同样根据终端1、终端2、终端3分别对应的UL grant的调度信息，在子帧n7～n8接收各终端的Msg3，合并得到最终的Msg3消息，并产生各终端的Msg3的ACK/NACK反馈，按照特定顺序映射到专用于传输ACK/NACK反馈的DCI中的特定位置：例如根据各终端RAR的顺序映射ACK/NACK，则如图4所示，或者，按照如图5所示，每个终端的ACK/NACK信息都对应一个指示域，该指示域用于指示不同终端的preamble序列的编号，或者，根据PRB编号从小到大(也可从大到小)顺序映射，不同子带也 可以放在同一个DCI中，顺序映射，如图7所示；基站根据RA-RNTI-1与专用于ACK/NACK反馈的RNTI(以下简称为AN-RNTI)的对应关系，确定与RA-RNTI-1对应的AN-RNTI-1；基站在子帧n9～n10中，在公共搜索空间中，重复发送由该AN-RNTI-1加扰的下行控制信道，该下行控制信道承载上述专用于承载终端的Msg3对应的ACK/NACK反馈的DCI。
3)终端1、终端2、终端3按照上述基站侧的同样方式确定AN-RNTI-1，在子帧n9～n10中，在公共搜索空间中，检测采用AN-RNTI-1加扰的下行控制信道，将多个子帧中的信息合并，得到承载ACK/NACK反馈的DCI，根据与基站侧映射ACK/NACK反馈一致的方法确定其反馈信息在该DCI中的具体位置；进一步根据反馈信息确定是否重传，如果为ACK，则Msg3接受正确，不需要重传，否则，在子帧n11～n12中，按照第一次Msg3传输的调度信息，重传该Msg3(即非自适应重传)。
例如，终端1的反馈信息为ACK，终端2和终端3的反馈为NACK，则终端2和终端3需要重传其Msg3；基站则重复上述2)中的步骤接收终端2和终端3的Msg3重传信息，并产生ACK/NACK反馈，按照同样的方式映射到DCI中发送，即终端2和终端3的ACK/NACK反馈在DCI中的映射位置不改变，此时，由于不需要反馈终端1的ACK/NACK反馈，DCI中对应终端1的ACK/NACK反馈可被置为0，作为占位信息；相应的，终端侧，终端1不再需要监听AN-RNTI-1加扰的下行控制信道，终端2和终端3还需要按照上述3)中的相同步骤获得其Msg3重传的ACK/NACK反馈，以此类推，直到Msg3传输正确或者达到Msg3的最大重传次数。
上述方法处理流程可以用软件程序实现，该软件程序可以存储在存储介质中，当存储的软件程序被调用时，执行上述方法步骤。
基于同一发明构思，本发明实施例中还提供了一种终端，由于该终端解决问题的原理与上述图2所示的一种终端侧的随机接入方法相似，因此该终端的实施可以参见图2所示的方法的实施，重复之处不再赘述。
本发明实施例提供的一种终端，如图9所示，该终端包括：
确定模块91，用于根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出自身所属的终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
下行消息获取模块92，用于使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；
处理模块93，用于根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
在实施中，所述处理模块93从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之前，还用于：
确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
在实施中，作为第一种优选的实现方式，所述处理模块93，具体用于：
根据所述终端的随机接入响应RAR在RAR消息中的位置，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述处理模块93，具体用于：
根据所述终端的前导preamble序列的标识信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述处理模块93，具体用于：
根据所述终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以 及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，所述终端还包括：
重传模块(未在图中示出)，用于在所述终端的Msg3的ACK/NACK反馈为NACK时，按照所述终端对应的RAR grant所指示的调度信息，重新传输所述终端的Msg3。
基于同一发明构思，本发明实施例中还提供了一种基站，由于该基站解决问题的原理与上述图8所示的一种基站侧的随机接入方法相似，因此该基站的实施可以参见图8所示的方法的实施，重复之处不再赘述。
本发明实施例提供的一种基站，如图10所示，该基站包括：
接收模块101，用于接收到至少两个终端发送的Msg3；
反馈信息生成模块102，用于产生所述至少两个终端的Msg3对应的ACK/NACK反馈；
映射模块103，用于将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
确定模块104，用于根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
发送模块105，用于使用所述专用于ACK/NACK反馈的RNTI对所述下 行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息。
在实施中，作为第一种优选的实现方式，所述映射模块103具体用于：
根据所述至少两个终端对应的RAR在RAR消息中的位置，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述映射模块103具体用于：
根据所述至少两个终端的preamble序列的标识信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述映射模块103具体用于：
根据所述至少两个终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，所述接收模块101还用于：
按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的调度 信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3。
下面结合优选的硬件结构，对本发明实施例提供的终端的结构、处理方式进行说明。
如图11所示，本发明实施例提供的终端包括收发机111、以及与该收发机111连接的至少一个处理器112，其中：
处理器112，用于读取存储器113中的程序，执行下列过程：
根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出自身所属的终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈；
收发机111，用于在处理器112的控制下接收和发送数据。
在图11中，总线架构(用总线110来代表)，总线110可以包括任意数量的互联的总线和桥，总线110将包括由通用处理器112代表的一个或多个处理器和存储器113代表的存储器的各种电路链接在一起。总线110还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口114在总线110和收发机111之间提供接口。收发机111可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。例如：收发机111从其他设备接收外部数据。收发机111用于将处理器112处理后的数据发送给其他设备。取决于计算系统的性质，还可以提供用户接口115，例如小键盘、显示器、扬声器、麦克风、操纵杆。
处理器112负责管理总线110和通常的处理，如前述所述运行通用操作系统。而存储器113可以被用于存储处理器112在执行操作时所使用的数据。
可选的，处理器112可以是中央处理器(Central Processing Unit，简称CPU)、特定用途集成电路(Application Specific Integrated Circuit，简称ASIC)、 现场可编程门阵列(Field Programmable Gate Array，简称FPGA)，或复杂可编程逻辑器件(Complex Programmable Logic Device，简称CPLD)。
在实施中，所述处理器112从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之前，还执行下列过程：
确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
在实施中，作为第一种优选的实现方式，所述处理器112执行确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
根据所述终端的随机接入响应RAR在RAR消息中的位置，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述处理器112执行确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
根据所述终端的前导preamble序列的标识信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述处理器112执行确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
根据所述终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI， 其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，所述收发机111还执行下列过程：
在所述终端的Msg3的ACK/NACK反馈为NACK时，按照所述终端对应的RAR grant所指示的调度信息，重新传输所述终端的Msg3。
下面结合优选的硬件结构，对本发明实施例提供的基站的结构、处理方式进行说明。
如图12所示，本发明实施例提供的基站包括收发机121、以及与该收发机121连接的至少一个处理器122，其中：
处理器122，用于读取存储器123中的程序，执行下列过程：
通过收发机121接收到至少两个终端发送的Msg3；产生所述至少两个终端的Msg3对应的ACK/NACK反馈；将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并控制所述收发机121通过下行控制信道，发送加扰后的下行消息。
在图12中，总线架构(用总线120来代表)，总线120可以包括任意数量的互联的总线和桥，总线120将包括由处理器122代表的一个或多个处理器和存储器123代表的存储器的各种电路链接在一起。总线120还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口124在总线120和收发机121之间提供接口。收发机121可以是一个元件，也可 以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器122处理的数据通过天线125在无线介质上进行传输，进一步，天线125还接收数据并将数据传送给处理器122。
处理器122负责管理总线120和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器123可以被用于存储处理器122在执行操作时所使用的数据。
可选的，处理器122可以是CPU、ASIC、FPGA或CPLD。
在实施中，作为第一种优选的实现方式，所述处理器122具体执行下列过程：
根据所述至少两个终端对应的RAR在RAR消息中的位置，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
作为第二种优选的实现方式，所述处理器122具体执行下列过程：
根据所述至少两个终端的preamble序列的标识信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
作为第三种优选的实现方式，所述处理器122具体执行下列过程：
根据所述至少两个终端传输Msg3所使用的PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
本发明实施例中，所述下行控制信道为EPDCCH。
本发明实施例中，所述下行消息为专用于传输ACK/NACK反馈的DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息 域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
本发明实施例中，所述下行控制信道在公共搜索空间中传输。
本发明实施例中，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
基于上述任一实施例，所述收发机121还执行下列过程：
按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的调度信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3。
基于同一发明构思，本发明实施例还提供了一种通信系统，如图13所示，该系统包括：
基站131，用于接收到至少两个终端发送的Msg3，并产生所述至少两个终端的Msg3对应的ACK/NACK反馈；将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息；
终端132，用于根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘 存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (41)

  1. 一种随机接入方法，其特征在于，该方法包括：
    终端根据随机接入无线网络临时标识RA-RNTI与专用于肯定确认ACK/否定确认NACK反馈的RNTI的对应关系，确定出所述终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
    所述终端使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；
    所述终端根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
  2. 如权利要求1所述的方法，其特征在于，所述终端从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之前，还包括：
    所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
  3. 如权利要求2所述的方法，其特征在于，所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
    所述终端根据所述终端的随机接入响应RAR在RAR消息中的位置，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
    其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
  4. 如权利要求2所述的方法，其特征在于，所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
    所述终端根据所述终端的前导preamble序列的标识信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
    其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble 序列的标识信息，A为自然数。
  5. 如权利要求2所述的方法，其特征在于，所述终端确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，包括：
    所述终端根据所述终端传输Msg3所使用的物理资源块PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
  6. 如权利要求1所述的方法，其特征在于，所述下行控制信道为增强物理下行控制信道EPDCCH。
  7. 如权利要求1所述的方法，其特征在于，所述下行消息为专用于传输ACK/NACK反馈的下行控制信息DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
  8. 如权利要求1所述的方法，其特征在于，所述下行控制信道在公共搜索空间中传输。
  9. 如权利要求1所述的方法，其特征在于，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为所述终端和基站预先定义的，或者由基站通过系统消息通知给所述终端。
  10. 如权利要求1～9任一项所述的方法，其特征在于，所述终端从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之后，还包括：
    若所述终端的Msg3的ACK/NACK反馈为NACK，所述终端按照所述终端对应的RAR许可grant所指示的调度信息，重新传输所述终端的Msg3。
  11. 一种随机接入方法，其特征在于，该方法包括：
    基站接收到至少两个终端发送的Msg3，并产生所述至少两个终端的Msg3对应的肯定确认ACK/否定确认NACK反馈；
    所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
    所述基站根据所述至少两个终端所对应的随机接入无线网络临时标识RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
    所述基站使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息。
  12. 如权利要求11所述的方法，其特征在于，所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到所述下行消息中，包括：
    所述基站根据所述至少两个终端对应的随机接入响应RAR在RAR消息中的位置，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
    其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
  13. 如权利要求11所述的方法，其特征在于，所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到所述下行消息中，包括：
    所述基站根据所述至少两个终端的preamble序列的标识信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
    其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
  14. 如权利要求11所述的方法，其特征在于，所述基站将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到所述下行消息中，包括：
    所述基站根据所述至少两个终端传输Msg3所使用的物理资源块PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
  15. 如权利要求11所述的方法，其特征在于，所述下行控制信道为增强 物理下行控制信道EPDCCH。
  16. 如权利要求11所述的方法，其特征在于，所述下行消息为专用于传输ACK/NACK反馈的下行控制信息DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
  17. 如权利要求11所述的方法，其特征在于，所述下行控制信道在公共搜索空间中传输。
  18. 如权利要求11所述的方法，其特征在于，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
  19. 如权利要求11～18任一项所述的方法，其特征在于，该方法还包括：
    所述基站按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的调度信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3。
  20. 一种终端，其特征在于，该终端包括：
    确定模块，用于根据随机接入无线网络临时标识RA-RNTI与专用于肯定确认ACK/否定确认NACK反馈的RNTI的对应关系，确定出自身所属的终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
    下行消息获取模块，用于使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；
    处理模块，用于根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
  21. 如权利要求20所述的终端，其特征在于，所述处理模块从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈之前，还用于：
    确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
  22. 如权利要求21所述的终端，其特征在于，所述处理模块，具体用于：
    根据所述终端的随机接入响应RAR在RAR消息中的位置，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
    其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
  23. 如权利要求21所述的终端，其特征在于，所述处理模块，具体用于：
    根据所述终端的前导preamble序列的标识信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置；
    其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble序列的标识信息，A为自然数。
  24. 如权利要求21所述的终端，其特征在于，所述处理模块，具体用于：
    根据所述终端传输Msg3所使用的物理资源块PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，确定出所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置。
  25. 如权利要求20所述的终端，其特征在于，所述下行控制信道为增强物理下行控制信道EPDCCH。
  26. 如权利要求20所述的终端，其特征在于，所述下行消息为专用于传输ACK/NACK反馈的下行控制信息DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
  27. 如权利要求20所述的终端，其特征在于，所述下行控制信道在公共搜索空间中传输。
  28. 如权利要求20所述的终端，其特征在于，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为所述终端和基站预先定义的，或者由 基站通过系统消息通知给所述终端。
  29. 如权利要求20～28任一项所述的终端，其特征在于，所述终端还包括：
    重传模块，用于在所述终端的Msg3的ACK/NACK反馈为NACK时，按照RAR grant所指示的调度信息，重新传输所述终端的Msg3。
  30. 一种基站，其特征在于，该基站包括：
    接收模块，用于接收到至少两个终端发送的Msg3；
    反馈信息生成模块，用于产生所述至少两个终端的Msg3对应的ACK/NACK反馈；
    映射模块，用于将所述至少两个终端的Msg3对应的肯定确认ACK/否定确认NACK反馈映射到下行消息中；
    确定模块，用于根据所述至少两个终端所对应的RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
    发送模块，用于使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息。
  31. 如权利要求30所述的基站，其特征在于，所述映射模块具体用于：
    根据所述至少两个终端对应的随机接入响应RAR在RAR消息中的位置，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
    其中，不同终端的Msg3对应的ACK/NACK反馈在所述下行消息中的排序方式与该终端对应的RAR在RAR消息中的排序方式相同，所述RAR消息由所述RA-RNTI加扰。
  32. 如权利要求30所述的基站，其特征在于，所述映射模块具体用于：
    根据所述至少两个终端的preamble序列的标识信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
    其中，所述下行消息中的每个ACK/NACK反馈所在位置之前的A个比特信息或者之后的A个比特信息为该ACK/NACK反馈对应的终端的preamble 序列的标识信息，A为自然数。
  33. 如权利要求30所述的基站，其特征在于，所述映射模块具体用于：
    根据所述至少两个终端传输Msg3所使用的物理资源块PRB、传输Msg3所在的窄带信息、以及传输Msg3所使用的导频循环移位信息中的至少一种信息，将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中。
  34. 如权利要求30所述的基站，其特征在于，所述下行控制信道为增强物理下行控制信道EPDCCH。
  35. 如权利要求30所述的基站，其特征在于，所述下行消息为专用于传输ACK/NACK反馈的下行控制信息DCI，其中，所述DCI包含M个比特信息，所述M个比特信息被划分为N个信息域，所述N个信息域中的每个信息域分别用来承载一个ACK/NACK反馈，其中，M和N均为大于等于1的整数。
  36. 如权利要求30所述的基站，其特征在于，所述下行控制信道在公共搜索空间中传输。
  37. 如权利要求30所述的基站，其特征在于，RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系为终端和基站预先定义的，或者由基站通过系统消息通知给终端。
  38. 如权利要求30～37任一项所述的基站，其特征在于，所述接收模块还用于：
    按照对应ACK/NACK反馈为NACK的终端的RAR grant所指示的调度信息，重新接收ACK/NACK反馈为NACK的终端重新发送的Msg3。
  39. 一种通信系统，其特征在于，该系统包括：
    基站，用于接收到至少两个终端发送的Msg3，并产生所述至少两个终端的Msg3对应的肯定确认ACK/否定确认NACK反馈；将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；根据所述至少两个终端所对应的接入无线网络临时标识RA-RNTI与专用于ACK/NACK反馈的无线网络临时标识RNTI的对应关系，确定出所述RA-RNTI对应的专用于 ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并通过下行控制信道，发送加扰后的下行消息；
    终端，用于根据RA-RNTI与专用于ACK/NACK反馈的RNTI的对应关系，确定出所述终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈。
  40. 一种终端，其特征在于，包括：收发机、以及与所述收发机连接的至少一个处理器，其中：
    所述处理器，用于读取存储器中的程序，执行下列过程：
    根据随机接入无线网络临时标识RA-RNTI与专用于肯定确认ACK/否定确认NACK反馈的RNTI的对应关系，确定出所述终端的RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
    使用所述专用于ACK/NACK反馈的RNTI，检测下行控制信道，以获得用于承载Msg3对应的ACK/NACK反馈的下行消息；
    根据所述终端的Msg3对应的ACK/NACK反馈在所述下行消息中的位置，从所述下行消息中获取所述终端的Msg3的ACK/NACK反馈；
    所述收发机，用于在所述处理器的控制下接收和发送数据。
  41. 一种基站，其特征在于，包括：收发机、以及与该收发机连接的至少一个处理器，其中：
    所述处理器，用于读取存储器中的程序，执行下列过程：
    通过收发机接收到至少两个终端发送的Msg3，并产生所述至少两个终端的Msg3对应的肯定确认ACK/否定确认NACK反馈；
    将所述至少两个终端的Msg3对应的ACK/NACK反馈映射到下行消息中；
    根据所述至少两个终端所对应的接入无线网络临时标识RA-RNTI与专用 于ACK/NACK反馈的RNTI的对应关系，确定出所述RA-RNTI对应的专用于ACK/NACK反馈的RNTI；
    使用所述专用于ACK/NACK反馈的RNTI对所述下行消息进行加扰，并控制所述收发机通过下行控制信道，发送加扰后的下行消息。
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CN114257274A (zh) * 2020-09-21 2022-03-29 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
CN114257274B (zh) * 2020-09-21 2023-02-17 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
CN114287166A (zh) * 2021-12-06 2022-04-05 北京小米移动软件有限公司 一种基于四步随机接入的第三条消息重复的覆盖增强方法
CN114287166B (zh) * 2021-12-06 2024-04-05 北京小米移动软件有限公司 一种基于四步随机接入的第三条消息重复的覆盖增强方法

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