WO2016119591A1 - 随机接入响应消息发送方法和节点 - Google Patents

随机接入响应消息发送方法和节点 Download PDF

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Publication number
WO2016119591A1
WO2016119591A1 PCT/CN2016/070715 CN2016070715W WO2016119591A1 WO 2016119591 A1 WO2016119591 A1 WO 2016119591A1 CN 2016070715 W CN2016070715 W CN 2016070715W WO 2016119591 A1 WO2016119591 A1 WO 2016119591A1
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Prior art keywords
random access
type
node
information
access response
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PCT/CN2016/070715
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English (en)
French (fr)
Inventor
刘锟
戴博
鲁照华
夏树强
陈宪明
石靖
方惠英
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中兴通讯股份有限公司
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Priority to US15/546,378 priority Critical patent/US10433341B2/en
Publication of WO2016119591A1 publication Critical patent/WO2016119591A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application relates to, but is not limited to, the field of communications.
  • MTC UE Machine Type Communication (MTC) User Terminal (MTC UE), also known as Machine-to-Machine (M2M) user communication equipment, is the main application form of the Internet of Things at this stage. .
  • M2M devices currently deployed on the market are mainly based on the Global System of Mobile communication (GSM) system.
  • GSM Global System of Mobile communication
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution/LTE Evolution
  • M2M multi-class data services based on LTE/LTE-A will also be more attractive. Only when the cost of the LTE-M2M device can be lower than the MTC terminal of the GSM system can the M2M service be truly transferred from the GSM to the LTE system.
  • the main alternative methods for reducing the cost of the MTC user terminal include: reducing the number of terminal receiving antennas, reducing the baseband processing bandwidth of the terminal, reducing the peak rate supported by the terminal, adopting a half-duplex mode, and the like.
  • the reduction in cost means a decrease in performance.
  • the demand for cell coverage in the LTE/LTE-A system cannot be reduced. Therefore, the MTC terminal with low-cost configuration needs to take some measures to achieve the coverage performance requirement of the LTE terminal.
  • the MTC terminal may be located in a basement, a corner, etc., and the scene is worse than that of a normal LTE UE. In order to compensate for the decrease in coverage caused by the penetration loss, some MTC UEs need higher performance improvement.
  • the terminal transmits the random access sequence (Preamble) on the PRACH, it receives the random access response message sent by the base station (Random Access). Response, referred to as RAR).
  • the scheduling information of the RAR is included in the downlink control information (Downlink Control Information, DCI for short) and is transmitted through a physical downlink control channel (Physical Downlink Control Channel, PDCCH for short), wherein the DCI information further includes 16 bits.
  • a Cyclic Redundancy Check (CRC) and the CRC is scrambled by a 16-bit Random Access Radio Network Temporary Identity (RA-RNTI), and the scrambling method is :
  • the value of the RA-RNTI is determined by the PRACH occupied by the Preamble sequence sent by the terminal, as follows:
  • RA_RNTI 1+t_id+10*f_id
  • t_id (0 ⁇ t_id ⁇ 10) is an index of a subframe in which the first PRACH occupied by the Preamble sequence transmitted by the terminal is located; and f_id is a frequency domain resource index of the transmitted PRACH allocated to the terminal in the subframe indicated by t_id ( Arranged in ascending order and 0 ⁇ f_id ⁇ 6)
  • the UE receives the RAR message and obtains uplink time synchronization.
  • the random access response of the LTE/LTE-A system is enhanced by the enhanced design of the Physical Access Access Channel (PRACH) of the LTE/LTE-A system to ensure that the MTC UE can access the system normally.
  • PRACH Physical Access Access Channel
  • the message (Random Access Response, RAR for short) also needs to be enhanced to ensure that the MTC UE can receive it normally.
  • This paper provides a RAR transmission method and node to solve the problem of RAR enhanced design.
  • a RAR transmission method includes:
  • the first type of node sends a random access response message (RAR) through the downlink channel, in the RAR
  • RAR random access response message
  • the method before the step of sending, by the first type of node, the RAR by using the downlink channel, the method further includes:
  • the first type of node receives random access signaling sent by the second type of node.
  • the method further includes: the scheduling information of the RAR is included in downlink control information (DCI), and is sent by using a physical downlink control channel (PDCCH) and/or an enhanced physical downlink control channel (EPDCCH).
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • EPDCCH enhanced physical downlink control channel
  • the scheduling information of the RAR includes resource allocation information of the random access response information of the N-type second-type nodes in the RAR, where N is greater than or equal to 1.
  • the resource allocation information is indicated by the first index information, where the first index information is described by K bits, and K is greater than or equal to 1.
  • any one or any of the following information is indicated by the first index information:
  • the number of random access response information sent to the second type of nodes of each of the levels supported by the RAR is proportional information of the number of random access response information that can be supported in the RAR.
  • the random access response information of the second type of node includes the level information of the second type of node.
  • the method further includes:
  • the first type of node sends back indication indication (BI) index information to the second type of node.
  • BI back indication indication
  • the BI index information is sent in the RAR.
  • the method further includes: the second type of node obtaining the first information according to the BI index information A back-off parameter (BP), wherein the mapping relationship between the BI index information and the first BP is configured by a standard default.
  • BP back-off parameter
  • the method further includes: determining, by the second type of node, the second BP according to any one of the following expressions:
  • Second BP first BP x A x B
  • Second BP first BP x A
  • Second BP first BP x B
  • Second BP first BP
  • the value of A has a mapping relationship with the level of the second type of node.
  • B is the number of repetitions of the last transmission of the Preamble by the second type of node or the number of subframes (Subframes) occupied by the second type of node for the last time the Preamble is sent or the Subframe of the last time the second type of node sends the Preamble.
  • the BI index information is indicated in system information (SI).
  • the BI index information is sent by the first type of node by using a message, where the scheduling information of the message is included in the DCI and sent by using a PDCCH and/or an EPDCCH.
  • a cyclic redundancy check code is further included in the DCI, and the CRC is scrambled by using a BI-specific access radio network temporary identifier (RNTI).
  • RNTI BI-specific access radio network temporary identifier
  • the BI index information is included in the DCI and sent by using a PDCCH and/or an EPDCCH.
  • the DCI is further included in the DCI, and the CRC is scrambled by using a BI-specific RNTI.
  • only one random access response information of the second type of node is carried in the RAR.
  • the method further includes:
  • mapping table of BI index information and BP is defined in advance, wherein mapping tables corresponding to different levels are different.
  • the method further includes: the second type node selects a corresponding mapping table according to the level information, and obtains a corresponding BP according to the BI index information in the selected mapping table.
  • mapping relationship between the BI index information and the BP of the second type node of different levels is predefined in the same mapping table.
  • the value range of the BI index information of the second type of nodes of different levels is notified by the first type of node or determined by a predefined manner.
  • the value ranges of the BI index information of the second type of nodes of different levels have an intersection.
  • the random access response information of the second type of node includes uplink delay (UL Delay) information of the second type of node, and the method further includes:
  • the second type of node determines whether to delay sending the Msg3 message according to the UL Delay information.
  • the method further includes: when the UL Delay information indicates that the Msg3 message is delayed to be sent, the second type node determines the delay time T of the Msg3 message transmission according to the following expression:
  • the mapping between the value of D and the level of the second type of node is determined by the number of repeated transmissions of the PUSCH of the second type of node, and the unit of measurement of D is a Subframe or a frame.
  • the method further includes:
  • mapping table of UL Delay information Pre-defining a mapping table of UL Delay information and a time T of delayed transmission, wherein different mapping tables corresponding to different levels are different;
  • the second type of node first selects the corresponding mapping table according to the level information, and then obtains a time T of delayed transmission according to the UL Delay information in the selected mapping table.
  • the time T of the second type of node obtaining the delayed transmission is 0, indicating that the second type of node does not enable the delayed sending of the Msg3 message.
  • the Msg3 message message includes at least one of the following:
  • RRCConnectionReestablishmentRequest a radio resource control connection reestablishment request message
  • the random access response information of the second type of node includes resource allocation information required by the second type of node to send an Msg3 message.
  • the index of the resource allocation information is 0 to M-1, and an index of each resource allocation information indicates any one or any of the following:
  • the transport block size (TBS) of the Msg3 message is the transport block size (TBS) of the Msg3 message.
  • the frequency band location information occupied by the second type of node sending the Msg3 message is determined by at least one of the following manners:
  • the random access signaling sent by the second type of node occupies the same frequency band
  • the determining, by the second type of node, the frequency band occupied by the random access signaling includes:
  • the frequency band occupied by the random access signaling sent by the second type of node has a mapping relationship with the frequency band occupied by the second type of node for transmitting the Msg3 message, and the frequency band position information occupied by the Msg3 message is determined according to the mapping relationship.
  • the mapping relationship is configured by a standard default or sent by the first type of node to the second type of node.
  • the frequency band location information of the UE-specific search space (USS) of the DCI of the second type of node is in the random access response information of the second type of node.
  • the frequency band location information of the UE-specific search space (USS) of the DCI of the second type of node is reported by the second type of node in the Msg3 message;
  • the level of the second type of node includes at least one of the following:
  • the PRACH channel repeats the transmission level.
  • the first type of node is any of the following devices:
  • the second type of node is any of the following devices:
  • One or more person-to-person (H2H) communication terminals are provided.
  • M2M machine-to-machine
  • One or more device-to-device (D2D) communication terminals are provided.
  • D2D device-to-device
  • One or more machine type communication (MTC) communication terminals are One or more machine type communication (MTC) communication terminals.
  • MTC machine type communication
  • the response message sending module is configured to: send the RAR through the downlink channel, and carry the random access response information of the one or more second type nodes in the RAR.
  • the node further includes:
  • the signaling receiving module is configured to: receive the random access signaling sent by the second type of node.
  • the node is integrated into any of the following devices:
  • Macrocell Microcell, Picocell, Femtocell, LPN, Relay.
  • a computer readable storage medium storing computer executable instructions for performing the method of any of the above.
  • the embodiment of the present invention provides a RAR sending method and a node.
  • the first type of node sends an RAR through a downlink channel, and carries random access response information of one or more second type nodes in the RAR.
  • the enhanced design of RAR is realized, and the problem of RAR enhanced design is solved.
  • FIG. 1 is a schematic structural diagram of a RAR message according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of another RAR message according to Embodiment 1 of the present invention.
  • Embodiment 3 is a schematic structural diagram of RAR messages according to Embodiment 2, Embodiment 6, Embodiment 7, Embodiment 8, Embodiment 11 and Embodiment 12 of the present invention;
  • Embodiment 4 is a schematic structural diagram of RAR messages according to Embodiment 3, Embodiment 9, and Embodiment 10 of the present invention.
  • FIG. 5 is a flowchart of a RAR sending method according to Embodiment 13 of the present invention.
  • FIG. 6 is a schematic structural diagram of a node according to Embodiment 14 of the present invention.
  • the RAR of the LTE/LTE-A system needs to be enhanced to ensure that the MTC UE can receive it normally.
  • an embodiment of the present invention provides a method and a node for sending a random access response message. After receiving the random access signaling sent by the second type of node, the first type of node sends the RAR through the downlink channel.
  • the RAR carries random access response information of one or more second type nodes.
  • the first type of node can be any of the following devices:
  • the second type of node can be any of the following devices:
  • One or more person-to-person (H2H) communication terminals are provided.
  • M2M machine-to-machine
  • One or more device-to-device (D2D) communication terminals are provided.
  • D2D device-to-device
  • One or more machine type communication (MTC) communication terminals are One or more machine type communication (MTC) communication terminals.
  • MTC machine type communication
  • the second type of node is used as an example for the MTC communication terminal (MTC UE).
  • MTC UE MTC communication terminal
  • the implementation principle is the same, and the description is not repeated.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the UE1 to the UE3 need to receive the random access response information sent by the eNB, and the random access response information is sent in the RAR.
  • the scheduling information of the RAR is included in the downlink control information (Downlink Control Information, DCI for short) and the physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) and/or the enhanced physical downlink control channel.
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • EPDCCH Enhanced Physical Downlink Control Channel
  • the DCI includes resource allocation information of the random access response information of the MTC UEs of the three CELs in the RAR.
  • the resource allocation information indicates that there are five random access response information of CEL0 in the RAR, three random access response information of CEL1, and two random access response information of CEL2; and in the RAR.
  • the random access response information is arranged in the order of CEL from low to high. In this embodiment, first, the random access response information of CEL0, followed by the random access response information of CEL1, and finally the random access response information of CEL2, as shown in FIG.
  • the UE1 to the UE3 determine the range of the random access response information in the RAR according to the resource allocation information, and each random access response information and the Preamble index have a one-to-one mapping in the random access response information of the same CEL. relationship.
  • the UE determines the location of its own random access response information according to the index of the Preamble itself, and decodes the random access response information.
  • the DCI includes resource allocation information of the random access response information of the MTC UEs of the two CELs in the RAR.
  • the resource allocation information first includes indexes of two CELs, such as CEL0 and CEL1.
  • the resource allocation information further includes that the ratio information of the random access response information of the CEL0 and the CEL1 in the RAR is 5:3, and the ratio information indicates that there are five random access response information of the CEL0 in the RAR.
  • There are 3 random access response information of CEL1 (assuming that the number of random access response information that can be supported in RAR is 8); and the order of random access response information in RAR is: according to CEL low Arrange in high order.
  • the random access response information of CEL0 followed by the random access response information of CEL1, as shown in FIG. 2 .
  • the UE1 to the UE2 determine the range of the random access response information in the RAR according to the resource allocation information, and each random access response information and the Preamble index have a one-to-one mapping in the random access response information of the same CEL. relationship.
  • the UE determines the location of its own random access response information according to the index of the Preamble itself, and decodes the random access response information.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three coverage increases.
  • Coverage Enhancement level CEL
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the order of random access response information in RAR is: according to CEL from low to high order arrangement.
  • the random access response information of CEL0 followed by the random access response information of CEL1, as shown in FIG.
  • the random access response information includes the indication information of the CEL, and the UE1 finds the random access response information that is the same as the own CEL, that is, the random access response information that the eNB sends to itself.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the random access response information is sent in the RAR.
  • the RAR only includes eight random access response information of CEL0, as shown in FIG.
  • BP1 Backoff Parameter 1, BP1
  • UE1 determines the second backoff parameter (Backoff Parameter 2, BP2) according to the following formula:
  • BP2 BP1x A x B
  • the value of A has a mapping relationship with the CEL of the UE, as shown in Table 2.
  • B is the number of repetitions of the last transmission of the Preamble by UE1, or B is the number of subframes (Subframe) occupied by the UE1 for the most recent transmission of the Preamble, or B is the time corresponding to the subframe in which the UE1 last transmitted the Preamble; or B is The number of times the UE1 sends the number of repetitions of the Preamble, or B is the number of times that the UE1 sends the subframes occupied by the Preamble, or B is the time that the UE1 sends the subframes occupied by the Preamble.
  • the time of transmission is the delay T(ms) after the end of the RAR detection window, where the time T is 0 by UE1. Between ⁇ BP2 randomly selects a moment by random.
  • UE1 can also determine Backoff Parameter 2 (BP2) according to the following formula:
  • BP2 BP1x A
  • the value of A has a mapping relationship with the CEL of the UE, as shown in Table 3.
  • UE1 can also determine Backoff Parameter 2 (BP2) according to the following formula:
  • BP2 BP1x B
  • B is the number of repetitions of the last transmission of the Preamble by UE1, or B is the number of subframes (Subframe) occupied by the UE1 for the most recent transmission of the Preamble, or B is the time corresponding to the subframe in which the UE1 last transmitted the Preamble; or B is The number of times the UE1 sends the number of repetitions of the Preamble, or B is the number of times that the UE1 sends the subframes occupied by the Preamble, or B is the time that the UE1 sends the subframes occupied by the Preamble.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • each RAR includes only one random access response information of the UE; UE1 does not detect the random access response information sent to itself in the RAR detection time window, and the UE1 needs to resend the PRACH Preamble.
  • the backoff indicator (BI) which is information related to the retransmission of the PRACH Preamble time, is transmitted in System Information (SI).
  • SI System Information
  • UE1 obtains the retransmission PRACH Preamble time T according to the following rules:
  • UE1 determines Backoff Parameter 2 (BP2) according to the following formula:
  • BP2 BP1x B
  • B is the number of repetitions of the last transmission of the Preamble by UE1, or B is the number of subframes (Subframe) occupied by the UE1 for the most recent transmission of the Preamble, or B is the time corresponding to the subframe in which the UE1 last transmitted the Preamble; or B is The number of times the UE1 sends the number of repetitions of the Preamble, or B is the number of times that the UE1 sends the subframes occupied by the Preamble, or B is the time that the UE1 sends the subframes occupied by the Preamble.
  • the retransmission of the PRACH Preamble time is a delay T (ms) after the end of the RAR detection window, wherein the time T is uniformly selected by the UE 1 between 0 and BP2.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • each RAR includes only one random access response information of the UE; UE1 does not detect the random access response information sent to itself in the RAR detection time window, and the UE1 needs to resend the PRACH Preamble. .
  • the information related to the retransmission of the PRACH Preamble time that is, the backoff indicator (BI) is sent by the message, where the scheduling information of the message is included in the downlink control information (Downlink Control Information, DCI for short) and passes through the physical The downlink control channel (Physical Downlink Control Channel, referred to as PDCCH) and/or an Enhanced Physical Downlink Control Channel (EPDCCH);
  • PDCCH Physical Downlink Control Channel
  • EPDCCH Enhanced Physical Downlink Control Channel
  • the DCI information further includes a Cyclic Redundancy Check (CRC), and the CRC is scrambled by using a BI-specific Radio Network Temporary Identity (BI-RNTI);
  • CRC Cyclic Redundancy Check
  • BI-RNTI BI-specific Radio Network Temporary Identity
  • Backoff Parameter 1, BP1 Backoff Parameter 1, BP1
  • UE1 obtains the retransmission PRACH Preamble time T according to the following rules:
  • UE1 determines Backoff Parameter 2 (BP2) according to the following formula:
  • BP2 BP1x B
  • B is the number of repetitions of the last transmission of the Preamble by UE1, or B is the number of subframes (Subframe) occupied by the UE1 for the most recent transmission of the Preamble, or B is the time corresponding to the subframe in which the UE1 last transmitted the Preamble; or B is The number of times the UE1 sends the number of repetitions of the Preamble, or B is the number of times that the UE1 sends the subframes occupied by the Preamble, or B is the time that the UE1 sends the subframes occupied by the Preamble.
  • the retransmission of the PRACH Preamble time is a delay T (ms) after the end of the RAR detection window, wherein the time T is uniformly selected by the UE 1 between 0 and BP2.
  • the backoff indicator (BI) may also be included in the downlink control information (Downlink Control Information, DCI for short) and the physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) and/or enhanced physics.
  • the downlink physical control channel (Enhanced Physical Downlink Control Channel, referred to as EPDCCH) is transmitted.
  • the DCI information further includes a Cyclic Redundancy Check (CRC), and the CRC is scrambled by using a BI-specific Radio Network Temporary Identity (BI-RNTI);
  • CRC Cyclic Redundancy Check
  • BI-RNTI BI-specific Radio Network Temporary Identity
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the order of random access response information in RAR is: according to CEL from low to high order arrangement.
  • the random access response information of CEL0 followed by the random access response information of CEL1, as shown in FIG.
  • the random access response information includes the indication information of the CEL, and the UE1 finds the random access response information that is the same as the own CEL, that is, the random access response information that the eNB sends to itself.
  • the UE1 decodes the random access response information sent by the eNB to itself to obtain an uplink delay (UL Delay). The UE1 determines whether to delay sending the Msg3 message according to the uplink delay information. In this embodiment, “1” represents delayed transmission, and “0” represents no delayed transmission.
  • the UE1 determines the delay time T of the Msg3 transmission according to the following formula:
  • the value of D is mapped to the CEL of the UE; or the value of D is determined by at least the number of repeated PUSCH transmissions of the UE.
  • the Msg3 message includes at least one of the following:
  • RRCConnectionReestablishmentRequest a radio resource control connection reestablishment request message
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • random access response information of CEL0 in RAR there are 5 random access response information of CEL0 in RAR, and 3 random access response information of CEL1; and the order of random access response information in RAR is: according to CEL from low to high order arrangement.
  • the first is a random access response letter of CEL0.
  • the random access response information includes the indication information of the CEL, and the UE1 finds the random access response information that is the same as the own CEL, that is, the random access response information that the eNB sends to itself.
  • the UE1 decodes the random access response information sent by the eNB to itself to obtain uplink delay (UL Delay) information; the UE1 determines whether to delay sending the Msg3 message according to the uplink delay information; in this embodiment, “1” represents delayed transmission, “0” The delegate does not delay sending.
  • UL Delay uplink delay
  • the UE1 decodes the random access response information transmitted by the eNB to itself to obtain resource allocation information required for the Msg3 message.
  • the resources that the UE1 can send the Msg3 message are distributed on one or more narrowbands.
  • each resource allocation information index may indicate at least one of the following:
  • the transport block size (TBS) of the Msg3 message is the transport block size (TBS) of the Msg3 message.
  • the Msg3 message includes at least one of the following:
  • RRCConnectionReestablishmentRequest a radio resource control connection reestablishment request message
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the order of random access response information in RAR is: according to CEL from low to high order arrangement.
  • the random access response information of CEL0 followed by the random access response information of CEL1, as shown in FIG.
  • the random access response information includes the indication information of the CEL, and the UE1 finds the random access response information that is the same as the own CEL, that is, the random access response information that the eNB sends to itself.
  • the UE1 decodes the random access response information sent by the eNB to itself to obtain uplink delay (UL Delay) information; the UE1 determines whether to delay sending the Msg3 message according to the uplink delay information; in this embodiment, “1” represents delayed transmission, “0” The delegate does not delay sending.
  • UL Delay uplink delay
  • the UE1 decodes the random access response information transmitted by the eNB to itself to obtain resource allocation information required for the Msg3 message.
  • the index of the resource allocation information ranges from 0 to 63, and is configured by default.
  • the index of each resource allocation information has a mapping relationship with the I TBS and N PRB combinations, where N PRB is the number of PRBs allocated for the Msg3 message. ; I TBS is the TBS size related variable of the Msg3 message.
  • the TBS of the Msg3 message is 88 bits from the mapping table of the combination of TBS and I TBS , N PRB .
  • the index information of the four PRBs required for transmitting the Msg3 message is indicated by the eNB.
  • the modulation and coding mode used for transmitting the Msg3 message is configured by default by the system.
  • the Msg3 message includes at least one of the following:
  • RRCConnectionReestablishmentRequest a radio resource control connection reestablishment request message
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the RAR only includes eight random access response information of CEL0, as shown in FIG.
  • the UE1 decodes the BI information in the message header.
  • UE1 determines the backoff time (BT) according to the following formula:
  • the value of A has a mapping relationship with the CEL of the UE, as shown in Table 2.
  • B is the number of repetitions of the last transmission of the Preamble by UE1, or B is the number of subframes (Subframe) occupied by the UE1 for the most recent transmission of the Preamble, or B is the time corresponding to the subframe in which the UE1 last transmitted the Preamble; or B is The number of times the UE1 sends the number of repetitions of the Preamble, or B is the number of times that the UE1 sends the subframes occupied by the Preamble, or B is the time that the UE1 sends the subframes occupied by the Preamble.
  • the time of transmission is the delay T(ms) after the end of the RAR detection window, where the time T is 0 by UE1. Between BT, select a moment randomly and randomly.
  • the sub-table of Table 1 can also be as shown in Table 7.
  • BP1 Backoff Parameter1
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the RAR only includes eight random access response information of CEL0, as shown in FIG.
  • mapping table of the BI index and the backoff parameter (BP) is as shown in Table 8, Table 9, and Table 10, respectively corresponding to CEL0, CEL1, and CEL2;
  • BP Backoff Parameter
  • the time of transmission is the delay T(ms) after the end of the RAR detection window, where the time T is 0 by UE1. Between BP and BP select a moment by random.
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • random access response information of CEL0 in RAR there are 5 random access response information of CEL0 in RAR, and 3 random access response information of CEL1; and the order of random access response information in RAR is: according to CEL from low to high order arrangement.
  • the first is a random access response letter of CEL0.
  • the random access response information includes the indication information of the CEL, and the UE1 finds the random access response information that is the same as the own CEL, that is, the random access response information that the eNB sends to itself.
  • the UE1 decodes the random access response information sent by the eNB to itself to obtain uplink delay (UL Delay) information; and the UE1 determines, according to the uplink delay information, whether to delay sending the Msg3 message, including at least one of the following steps:
  • a mapping table of uplink delay (UL Delay) information and a time T of delayed transmission is defined in advance, wherein the mapping tables corresponding to different CELs are different.
  • the UE first selects the corresponding mapping table according to the CEL level information; then, in the selected mapping table, the time T of delayed transmission is obtained according to the uplink delay (UL Delay) information.
  • UL Delay uplink delay
  • the UE When the time T at which the delayed transmission is obtained is 0, the UE is instructed not to enable the delayed transmission of the Msg3 message.
  • the UE first selects the corresponding mapping table according to its own CEL level CEL0, for example, Table 11.
  • UE1 sends an Msg3 message on the first available uplink subframe after 4 ms delay after the first subframe in which the Msg3 message can be sent.
  • the Msg3 message includes at least one of the following:
  • RRCConnectionReestablishmentRequest a radio resource control connection reestablishment request message
  • MTC UEs there are MTC UEs in the LTE system, and the MTC UEs can support Coverage Enhancement (CE).
  • PRACH supports a total of three Coverage Enhancement Levels (CELs), namely CEL0, CEL1 and CEL2.
  • UE1 is an MTC UE of CEL0
  • UE2 is an MTC UE of CEL1
  • UE3 is an MTC UE of CEL2.
  • the base station (eNB) allocates PRACH resources for each CEL UE, including a random access sequence (Preamble) used for transmitting random access signaling, and a subframe (Subframe) and a physical resource block (PRB) used for transmitting the Preamble.
  • the MTC UE may be allocated PRACH resources by means of time division multiplexing and/or frequency division multiplexing and/or code division multiplexing.
  • the order of random access response information in RAR is: according to CEL from low to high order arrangement.
  • the random access response information of CEL0 followed by the random access response information of CEL1, as shown in FIG.
  • the random access response information includes the indication information of the CEL, and the UE1 finds the random access response information that is the same as the own CEL, that is, the random access response information that the eNB sends to itself.
  • the UE1 decodes the random access response information sent by the eNB to itself to obtain uplink delay (UL Delay) information; the UE1 determines whether to delay sending the Msg3 message according to the uplink delay information; in this embodiment, “1” represents delayed transmission, “0” The delegate does not delay sending.
  • UL Delay uplink delay
  • the UE1 decodes the random access response information transmitted by the eNB to itself to obtain resource allocation information required for the Msg3 message.
  • each resource allocation information index may indicate at least one of the following:
  • the transport block size (TBS) of the Msg3 message is the transport block size (TBS) of the Msg3 message.
  • the Msg3 message includes at least one of the following:
  • RRCConnectionReestablishmentRequest a radio resource control connection reestablishment request message
  • the resources that the UE1 can send the Msg3 message are distributed on one or more narrowbands.
  • the Narrowband location information occupied by the UE1 to send the Msg3 message is determined by at least one of the following:
  • the same Narrowband is occupied by the UE1 sending the Preamble
  • the Narrowband determination occupied by the Preamble is sent by the UE1.
  • the Narrowband occupied by the Preamble by the UE1 determines the Narrowband occupied by the UE1 to send the Msg3 message, including:
  • the Narrowband index occupied by the Preamble sent by UE1 is Index A
  • UE1 The index of the Narrowband occupied by the Msg3 message is Index (A+K), where K is configured by the standard default or configured by the eNB.
  • the Narrowband location information of the UE-specific search space (USS) of the Downlink Control Information (DCI) of the UE1 is reported in the Msg3 message sent by the UE1.
  • the Narrowband location information in which the UE-specific search space (USS) of the Downlink Control Information (DCI) of the UE1 is located may also be indicated in the random access response information sent by the eNB to the UE1.
  • USS UE-specific search space
  • DCI Downlink Control Information
  • an embodiment of the present invention provides a method for sending a random access response message, including:
  • Step 501 The first type of node sends a random access response message (RAR) through the downlink channel, and carries random access response information of one or more second type nodes in the RAR.
  • RAR random access response message
  • the method further includes:
  • Step 500 The first type of node receives the random access signaling sent by the second type of node.
  • the scheduling information of the RAR is included in downlink control information (DCI) and is sent by a physical downlink control channel (PDCCH) and/or an enhanced physical downlink control channel (EPDCCH).
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • EPDCCH enhanced physical downlink control channel
  • the scheduling information of the RAR includes resource allocation information of the random access response information of the N-type second-type nodes in the RAR, where N is greater than or equal to 1.
  • the resource allocation information is indicated by the first index information, where the first index information is described by K bits, and K is greater than or equal to 1.
  • any one or any of the following information is indicated by the first index information:
  • the number of random access response information sent to the second type of nodes of each of the levels supported by the RAR is proportional information of the number of random access response information that can be supported in the RAR.
  • the random access response information of the second type of node includes the level information of the second type of node.
  • backoff indication (BI) index information is sent in the RAR.
  • the second type of node obtains a first backoff parameter (BP) according to the BI index information, where a mapping relationship between the BI index information and the first BP is configured by a standard default.
  • BP backoff parameter
  • the second type of node determines the second BP according to any one of the following expressions:
  • Second BP first BP x A x B
  • Second BP first BP x A
  • Second BP first BP x B
  • Second BP first BP
  • the value of A has a mapping relationship with the level of the second type of node.
  • B is the number of repetitions of the last transmission of the Preamble by the second type of node or the number of subframes (Subframes) occupied by the second type of node for the last time the Preamble is sent or the Subframe of the last time the second type of node sends the Preamble.
  • the BI index information is indicated in system information (SI).
  • the RAR carries only one random access response letter of the second type of node
  • the BI index information is sent by the first type of node by a message, wherein the scheduling information of the message is included in the DCI and transmitted through the PDCCH and/or the EPDCCH.
  • a cyclic redundancy check code is further included in the DCI, and the CRC is scrambled by using a BI-specific access radio network temporary identifier (RNTI).
  • RNTI BI-specific access radio network temporary identifier
  • the BI index information is included in the DCI and sent by using a PDCCH and/or an EPDCCH.
  • the DCI is further included in the DCI, and the CRC is scrambled by using a BI-specific RNTI.
  • the BI index information is sent in the RAR.
  • the mapping table of the BI index information and the BP may also be predefined, wherein the mapping tables corresponding to different levels are different.
  • the second type of node first selects a corresponding mapping table according to the level information, and then obtains a corresponding BP according to the BI index information in the selected mapping table.
  • the mapping relationship between the BI index information and the BP of the second type node of different levels may be pre-defined in the same mapping table.
  • the value range of the BI index information of the different types of nodes of the second type is notified by the first type of node or determined by a predefined manner.
  • the value range of the BI index information of the second type of nodes of different levels may have an intersection.
  • the random access response information of the second type of node includes uplink delay (UL Delay) information of the second type of node, and the method further includes:
  • the second type of node determines whether to delay sending the Msg3 message according to the UL Delay information.
  • the second type node determines the delay time T of the Msg3 message transmission according to the following expression:
  • the mapping between the value of D and the level of the second type of node is determined by the number of repeated transmissions of the PUSCH of the second type of node, and the unit of measurement of D is a Subframe or a frame.
  • the second type of node determines, according to the UL Delay information, a time T for delaying the sending of the Msg3 message, including:
  • mapping table of UL Delay information Pre-defining a mapping table of UL Delay information and a time T of delayed transmission, wherein different mapping tables corresponding to different levels are different;
  • the second type of node first selects the corresponding mapping table according to the level information, and then obtains a time T of delayed transmission according to the UL Delay information in the selected mapping table.
  • the time T of obtaining the delayed transmission is 0, indicating that the second type of node does not enable the delay to send the Msg3 message.
  • the Msg3 message includes at least one of the following:
  • RRCConnectionReestablishmentRequest a radio resource control connection reestablishment request message
  • the random access response information of the second type of node includes resource allocation information required by the second type of node to send an Msg3 message.
  • the index of the resource allocation information is 0 to M-1, and an index of each resource allocation information indicates any one or any of the following:
  • the transport block size (TBS) of the Msg3 message is the transport block size (TBS) of the Msg3 message.
  • the frequency band location information occupied by the second type node sending the Msg3 message is as follows At least one of the ways to determine:
  • the random access signaling sent by the second type of node occupies the same frequency band
  • the frequency band occupied by the random access signaling sent by the second type of node is determined as:
  • the frequency band occupied by the random access signaling sent by the second type of node has a mapping relationship with the frequency band occupied by the second type of node for transmitting the Msg3 message, and the frequency band position information occupied by the Msg3 message is determined according to the mapping relationship.
  • the mapping relationship is configured by a standard default or sent by the first type of node to the second type of node.
  • the frequency band location information in which the UE-specific search space (USS) of the DCI of the second type of node is located is indicated in the random access response information of the second type of node.
  • the frequency band location information of the UE-specific search space (USS) of the DCI of the second type of node is reported by the second type of node in the Msg3;
  • the level of the second type of node involved in the embodiment of the present invention includes at least one of the following:
  • the PRACH channel repeats the transmission level.
  • the first type of node is any of the following devices:
  • the second type of node is any of the following devices:
  • One or more person-to-person (H2H) communication terminals are provided.
  • M2M machine-to-machine
  • One or more device-to-device (D2D) communication terminals are provided.
  • D2D device-to-device
  • One or more machine type communication (MTC) communication terminals are One or more machine type communication (MTC) communication terminals.
  • MTC machine type communication
  • An embodiment of the present invention provides a node, and the structure thereof is as shown in FIG. 6, and includes:
  • the response message sending module 601 is configured to: send the RAR through the downlink channel, and carry the random access response information of the one or more second type nodes in the RAR.
  • the node further includes:
  • the signaling receiving module 600 is configured to: receive random access signaling sent by the second type of node.
  • Embodiments 1 to 13 of the present invention The flow of performing RAR transmission using the above node as the first type of node is referred to Embodiments 1 to 13 of the present invention.
  • the above nodes can be integrated into any of the following devices:
  • Macrocell Microcell, Picocell, Femtocell, LPN, Relay.
  • An embodiment of the present invention provides a RAR method and a node.
  • the first type of node sends an RAR through a downlink channel, and carries random access response information of one or more second type nodes in the RAR.
  • the enhanced design of RAR is realized, and the problem of RAR enhanced design is solved.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the enhanced design of the RAR is realized, and the problem of the RAR enhanced design is solved.

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Abstract

本文公布一种随机接入响应消息发送方法和节点，该方法包括：第一类节点通过下行信道发送RAR，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。

Description

随机接入响应消息发送方法和节点 技术领域
本申请涉及但不限于通信领域。
背景技术
机器类型通信(Machine Type Communication，MTC)用户终端(MTC User Equipment，简称MTC UE)，又称机器到机器(Machine-to-Machine，简称M2M)用户通信设备，是现阶段物联网的主要应用形式。低功耗低成本是其可大规模应用的重要保障。目前市场上部署的M2M设备主要基于全球移动通信(Global System of Mobile communication，GSM)系统。近年来，由于长期演进(Long Term Evolution，LTE)/LTE的后续演进(LTE-A)的频谱效率的提高，越来越多的移动运营商选择LTE/LTE-A作为未来宽带无线通信系统的演进方向。基于LTE/LTE-A的M2M多种类数据业务也将更具吸引力。只有当LTE-M2M设备的成本能做到比GSM系统的MTC终端低时，M2M业务才能真正从GSM转到LTE系统上。
相关技术对于降低MTC用户终端成本的主要备选方法包括：减少终端接收天线的数目、降低终端基带处理带宽、降低终端支持的峰值速率、采用半双工模式等等。然而成本的降低意味着性能的下降，对于LTE/LTE-A系统小区覆盖的需求是不能降低的，因此采用低成本配置的MTC终端需要采取一些措施才能达到LTE终端的覆盖性能需求。另外，MTC终端可能位于地下室、墙角等位置，所处场景要比普通LTE UE恶劣。为了弥补穿透损耗导致的覆盖下降，部分MTC UE需要更高的性能提升，因此针对这种场景进行部分MTC UE的上下行覆盖增强是必要的。如何保证用户的接入质量则是首先需要考虑的问题，有必要针对LTE/LTE-A系统的随机接入信道(Physical Random Access Channel，简称为PRACH)进行增强设计，保证MTC UE可以正常接入系统。
LTE/LTE-A系统中，当终端在PRACH上发送完随机接入序列(Preamble)之后，就会接收基站发送的随机接入响应消息(Random Access  Response，简称为RAR)。RAR的调度信息是包含在下行控制信息(Downlink Control Information，简称为DCI)中且通过物理下行控制信道(Physical Downlink Control Channel，简称为PDCCH)发送的，其中，所述DCI信息中还包括16比特的循环冗余校验码(Cyclic Redundancy Check，CRC)，并且所述CRC采用16比特的随机接入无线网络临时标识(Random Access Radio Network Temporary Identity，RA-RNTI)进行加扰，加扰方式为：
ck＝(bk+ak)mod2k＝0,1,…,15。
其中，bk为CRC中的第k+1个比特；ak为RA-RNTI中的第k+1个比特；ck为加扰后生成的第k+1个比特。
其中，RA-RNTI的取值是由终端发送的Preamble序列占用的PRACH确定的，如下式：
RA_RNTI＝1+t_id+10*f_id
其中，t_id(0≤t_id<10)是终端发送的Preamble序列占用的第一个PRACH所在的子帧的索引；f_id是t_id所指示的子帧中为终端分配的发送PRACH的频域资源索引(按照升序排列且0≤f_id<6)
UE接收到RAR消息，获得上行的时间同步。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
由于对LTE/LTE-A系统的随机接入信道(Physical Random Access Channel，简称为PRACH)进行了增强设计，以保证MTC UE可以正常接入系统，所以LTE/LTE-A系统的随机接入响应消息(Random Access Response，简称为RAR)也需要进行增强设计，保证MTC UE可以正常接收到。
本文提供了一种RAR发送方法和节点，解决了RAR增强设计的问题。
一种RAR发送方法，包括：
第一类节点通过下行信道发送随机接入响应消息(RAR)，在所述RAR 中携带一个或多个第二类节点的随机接入响应信息。
可选的，所述第一类节点通过下行信道发送RAR的步骤之前，还包括：
所述第一类节点接收所述第二类节点发送的随机接入信令。
可选的，该方法还包括：所述RAR的调度信息包含在下行控制信息(DCI)中且通过物理下行控制信道(PDCCH)和/或增强型物理下行控制信道(EPDCCH)发送。
可选的，所述RAR的调度信息中包括N个等级的第二类节点的随机接入响应信息在所述RAR中的资源分配信息，N大于等于1。
可选的，所述资源分配信息通过第一索引信息指示，所述第一索引信息由K个bit描述，K大于等于1。
可选的，通过所述第一索引信息指示以下信息中的任一或任意多个：
在所述RAR中发送的随机接入响应信息所属的所述第二类节点的等级数量信息，
在所述RAR中发送的随机接入响应信息所属的所述第二类节点的等级索引信息，
在所述RAR中支持的发送给每个所述等级的所述第二类节点的随机接入响应信息的数量信息，
在所述RAR中支持的发送给每个所述等级的所述第二类节点的随机接入响应信息的数量占所述RAR中一共可以支持的随机接入响应信息数量的比例信息。
可选的，所述第二类节点的随机接入响应信息中包括所述第二类节点的等级信息。
可选的，该方法还包括：
所述第一类节点向所述第二类节点发送回退指示(BI)索引信息。
可选的，所述BI索引信息在所述RAR中发送。
可选的，该方法还包括：所述第二类节点根据所述BI索引信息获得第 一回退参数(BP)，其中所述BI索引信息与所述第一BP的映射关系由标准默认配置。
可选的，该方法还包括：所述第二类节点按照以下任一表达式确定第二BP：
第二BP＝第一BP x A x B，
第二BP＝第一BP x A，
第二BP＝第一BP x B，
第二BP＝第一BP，
其中，A的取值与所述第二类节点的等级存在映射关系，
B为所述第二类节点最近一次发送Preamble的重复次数或所述第二类节点最近一次发送Preamble的占用的子帧(Subframe)数量或所述第二类节点最近一次发送Preamble的占用的Subframe所对应的时间或所述第二类节点发送Preamble的重复次数或所述第二类节点发送Preamble的占用的Subframe数量或所述第二类节点发送Preamble的占用的Subframe所对应的时间。
可选的，当所述RAR中只携带一个所述第二类节点的随机接入响应信息时，所述BI索引信息在系统信息(SI)中指示。
可选的，所述BI索引信息由所述第一类节点通过消息发送，其中，所述消息的调度信息包含在DCI中且通过PDCCH和/或EPDCCH发送。
可选的，所述DCI中还包括循环冗余校验码(CRC)，并且所述CRC采用BI专用的接入无线网络临时标识(RNTI)进行加扰。
可选的，所述BI索引信息包含在DCI中且通过PDCCH和/或EPDCCH发送。
可选的，所述DCI中还包括CRC，并且所述CRC采用BI专用的RNTI进行加扰。
可选的，所述RAR中只携带一个所述第二类节点的随机接入响应信息。
可选的，该方法还包括：
预先定义BI索引信息与BP的映射表格，其中，不同等级对应的映射表格不同。
可选的，该方法还包括：所述第二类节点根据所述等级信息选择相应的映射表格，在选择的映射表格中，根据所述BI索引信息获得相应的BP。
可选的，不同等级的所述第二类节点的BI索引信息与BP的映射关系预先定义在同一映射表格中。
可选的，不同等级的所述第二类节点的BI索引信息的取值范围由所述第一类节点通知或者通过预定义的方式确定。
可选的，不同等级的所述第二类节点的BI索引信息的取值范围有交集。
可选的，所述第二类节点的随机接入响应信息中包括所述第二类节点的上行延迟(UL Delay)信息，该方法还包括：
所述第二类节点根据所述UL Delay信息确定是否延迟发送Msg3消息。
可选的，该方法还包括：当所述UL Delay信息指示为延迟发送Msg3消息时，所述第二类节点按照下面表达式确定Msg3消息发送的延迟时间T:
T＝D，
其中，D的取值与所述第二类节点的等级存在映射关系，由所述第二类节点的PUSCH的重复发送次数确定，D的度量单位为Subframe或帧(Frame)。
可选的，该方法还包括：
预先定义UL Delay信息与延迟发送的时间T的映射表格，其中，不同的所述等级对应的所述映射表格不同；
所述第二类节点首先根据所述等级信息选择相应的所述映射表格，然后在选择的所述映射表格中，根据所述UL Delay信息获得延迟发送的时间T。
可选的，所述第二类节点获得延迟发送的时间T为0时，指示所述第二类节点不使能延迟发送Msg3消息。
可选的，所述Msg3消息消息至少包括以下之一：
无线资源控制连接请求消息(RRCConnectionRequest)，
无线资源控制连接重建请求消息(RRCConnectionReestablishmentRequest)，
无线资源控制连接重配置完成消息(RRCConnectionReconfigurationComplete)。
可选的，所述第二类节点的随机接入响应信息中包括所述第二类节点发送Msg3消息所需的资源分配信息。
可选的，所述资源分配信息的索引为0至M-1，每个资源分配信息的索引指示以下任一或任意多项内容：
发送Msg3消息所需的物理资源块数量，
发送Msg3消息所需的物理资源块索引，
发送Msg3消息所使用的调制编码方式，
Msg3消息的传输块大小(TBS)。
可选的，所述第二类节点发送Msg3消息所占用的频带位置信息由以下方式中至少之一确定：
采用预定义的方式确定，
在所述第二类节点的随机接入响应信息中指示，
与所述第二类节点发送的所述随机接入信令占用相同的频带，
由所述第二类节点发送的所述随机接入信令占用的频带确定，
可选的，所述由所述第二类节点发送的所述随机接入信令占用的频带确定包括：
所述第二类节点发送的所述随机接入信令占用的频带与所述第二类节点发送Msg3消息所占用的频带存在映射关系，根据该映射关系确定发送Msg3消息所占用的频带位置信息，所述映射关系由标准默认配置或者由所述第一类节点发送给所述第二类节点。
可选的，所述第二类节点的DCI的用户专用检测空间(UE-specific search space，USS)所在的频带位置信息在所述第二类节点的随机接入响应信息中 指示。
可选的，所述第二类节点的DCI的用户专用检测空间(UE-specific search space，USS)所在的频带位置信息由所述第二类节点在Msg3消息中上报；
可选的，所述第二类节点的等级包括以下至少之一：
覆盖增强等级，
PRACH信道覆盖增强等级，
PRACH信道重复发送等级。
可选的，所述第一类节点为任一下列设备：
宏基站(Macrocell)、微基站(Microcell)、微微基站(Picocell)、毫微微基站(Femtocell)、低功率节点(LPN)、中继站(Relay)。
可选的，所述第二类节点为任一下列设备：
一个或多个人到人(H2H)通信终端，
一个或多个机器到机器(M2M)通信终端，
一个或多个设备到设备(D2D)通信终端，
一个或多个机器类型通信(MTC)通信终端。
一种节点，包括：
响应消息发送模块，设置为：通过下行信道发送RAR，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。
可选的，该节点还包括：
信令接收模块，设置为：接收所述第二类节点发送的随机接入信令。
可选的，该节点集成于任一下列设备中：
Macrocell、Microcell、Picocell、Femtocell、LPN、Relay。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于执行上述任一项的方法。
本发明实施例提供了一种RAR发送方法和节点，第一类节点通过下行信道发送RAR，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。实现了RAR的增强设计，解决了RAR增强设计的问题。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为本发明的实施例一提供的一种RAR消息结构示意图；
图2为本发明的实施例一提供的的另一种RAR消息结构示意图；
图3为本发明的实施例二、实施例六、实施例七、实施例八、实施例十一和实施例十二的RAR消息结构示意图；
图4为本发明的实施例三、实施例九和实施例十的RAR消息结构示意图；
图5为本发明的实施例十三提供的RAR发送方法流程图；
图6为本发明的实施例十四提供的一种节点的结构示意图。
本发明的实施方式
由于对LTE/LTE-A系统的PRACH进行了增强设计，以保证MTC UE可以正常接入系统，所以LTE/LTE-A系统的RAR也需要进行增强设计，保证MTC UE可以正常接收到。
为了解决上述问题，本发明的实施例提供了一种随机接入响应消息发送方法和节点，第一类节点在接收到第二类节点发送的随机接入信令后，通过下行信道发送RAR，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。
第一类节点可以为任一下列设备：
宏基站(Macrocell)、微基站(Microcell)、微微基站(Picocell)、毫微微基站(Femtocell)、低功率节点(LPN)、中继站(Relay)。
第二类节点可以为任一下列设备：
一个或多个人到人(H2H)通信终端，
一个或多个机器到机器(M2M)通信终端，
一个或多个设备到设备(D2D)通信终端，
一个或多个机器类型通信(MTC)通信终端。
本发明的实施例中，以第二类节点为MTC通信终端(MTC UE)为例进行说明，对于其他类型的第二类节点和第一类节点，其实现原理相同，不作重复说明。
下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
实施例一：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1～UE3按照eNB的配置信息在PRACH上发送完Preamble之后，需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR的调度信息是包含在下行控制信息(Downlink Control Information，简称为DCI)中且通过物理下行控制信道(Physical Downlink Control Channel，简称为PDCCH)和/或增强型物理下行控制信道(Enhanced Physical Downlink Control Channel，简称为EPDCCH)发送的。
所述DCI中包括3个CEL的MTC UE的随机接入响应信息在所述RAR中的资源分配信息。
本实施例中，所述资源分配信息指示RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个，CEL2的随机接入响应信息有2个；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信息，接下来是CEL1的随机接入响应信息，最后是CEL2的随机接入响应信息，如图1所示。
UE1～UE3根据所述资源分配信息确定自己的随机接入响应信息在RAR中的范围，并且在同一个CEL的随机接入响应信息内，每个随机接入响应信息与Preamble索引存在一一映射关系。UE根据自己发送Preamble的索引确定自己的随机接入响应信息的位置，并且解码所述随机接入响应信息。
除本实施例外，
所述DCI中包括3个CEL中的2个CEL的MTC UE的随机接入响应信息在所述RAR中的资源分配信息。
本实施例中，所述资源分配信息首先包括2个CEL的索引，例如CEL0和CEL1。所述资源分配信息还包括在所述RAR中CEL0和CEL1的随机接入响应信息的比例信息为5：3，则通过所述比例信息可以获知：RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个(假设已知RAR中一共可以支持的随机接入响应信息数量为8个)；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信息，接下来是CEL1的随机接入响应信息，如图2所示。
UE1～UE2根据所述资源分配信息确定自己的随机接入响应信息在RAR中的范围，并且在同一个CEL的随机接入响应信息内，每个随机接入响应信息与Preamble索引存在一一映射关系。UE根据自己发送Preamble的索引确定自己的随机接入响应信息的位置，并且解码所述随机接入响应信息。
实施例二：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增 强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝1，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信息，接下来是CEL1的随机接入响应信息，如图3所示。
UE1按顺序解码RAR消息头中的PID信息，发现有两个PID＝1的，则UE1会去尝试解码这两个PID对应的随机接入响应信息。所述随机接入响应信息中包括CEL的指示信息，则UE1找到与自己CEL相同的所述随机接入响应信息即为eNB发送给自己的随机接入响应信息。
实施例三：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝12，然后UE1需要接收eNB发送的随机接入响应信 息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR只包含CEL0的随机接入响应信息8个，如图4所示。
UE1解码消息头中的BI信息，本实施例中，获知BI Index＝3，则UE1通过查找表1获知第一回退参数BP1(Backoff Parameter 1，BP1)＝30ms。
表1
Index Value(ms)
0 0
1 10
2 20
3 30
4 40
5 60
6 80
7 120
8 160
9 240
10 320
11 480
12 960
13 Reserved
14 Reserved
15 Reserved
UE1按照下面公式确定第二回退参数(Backoff Parameter 2，BP2)：
BP2＝BP1x A x B；
其中，A的取值与UE的CEL存在映射关系，如表2所示。
本实施例中，UE1的CEL为CEL0，则A取值为1。
表2
CEL Value(ms)
0 1
1 2
2 3
其中，B为UE1最近一次发送Preamble的重复次数，或B为UE1最近一次发送Preamble占用的子帧(Subframe)数量，或B为UE1最近一次发送Preamble占用的子帧所对应的时间；或B为UE1发送Preamble的重复次数，或B为UE1发送Preamble占用的子帧(Subframe)数量，或B为UE1发送Preamble占用的子帧所对应的时间。
UE1按顺序解码RAR消息头中的PID信息，没有发现PID＝12的，则UE1需要重新发送PRACH Preamble，发送的时刻为RAR检测窗结束后延迟T(ms)，其中，时刻T由UE1在0～BP2之间通过均匀随机选择一个时刻。
除本实施例外，
UE1还可以按照下面公式确定回退参数2(Backoff Parameter 2，BP2)：
BP2＝BP1x A；
其中，A的取值与UE的CEL存在映射关系，如表3所示。
本实施例中，UE1的CEL为CEL0，则A取值为1。
表3
CEL Value(ms)
0 2
1 4
2 6
除本实施例外，
UE1还可以按照下面公式确定回退参数2(Backoff Parameter 2，BP2)：
BP2＝BP1x B；
其中，B为UE1最近一次发送Preamble的重复次数，或B为UE1最近一次发送Preamble占用的子帧(Subframe)数量，或B为UE1最近一次发送Preamble占用的子帧所对应的时间；或B为UE1发送Preamble的重复次数，或B为UE1发送Preamble占用的子帧(Subframe)数量，或B为UE1发送Preamble占用的子帧所对应的时间。
实施例四：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝12，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，每个RAR中只包含1个UE的随机接入响应信息；UE1在RAR的检测时间窗内并没有检测到发送给自己的随机接入响应信息，则UE1需要重新发送PRACH Preamble。与重新发送PRACH Preamble时刻相关的信息即回退信息(backoff Indicator，BI)在系统信息(System Information，SI)中发送。UE1获得BI信息后，本实施例中，获知BI Index＝3，则UE1通过查找表1获知回退参数1(Backoff Parameter 1，BP1)＝30ms。
UE1按照下面规则获得重新发送PRACH Preamble时刻T：
(1)UE1按照下面公式确定回退参数2(Backoff Parameter 2，BP2)：
BP2＝BP1x B；
其中，B为UE1最近一次发送Preamble的重复次数，或B为UE1最近一次发送Preamble占用的子帧(Subframe)数量，或B为UE1最近一次发送Preamble占用的子帧所对应的时间；或B为UE1发送Preamble的重复次数，或B为UE1发送Preamble占用的子帧(Subframe)数量，或B为UE1发送Preamble占用的子帧所对应的时间；
(2)重新发送PRACH Preamble时刻为RAR检测窗结束后延迟T(ms)，其中，时刻T由UE1在0～BP2之间通过均匀随机选择一个时刻。
实施例五：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝12，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，每个RAR中只包含1个UE的随机接入响应信息；UE1在RAR的检测时间窗内并没有检测到发送给自己的随机接入响应信息，则UE1需要重新发送PRACH Preamble。与重新发送PRACH Preamble时刻相关的信息即回退信息(backoff Indicator，BI)通过消息发送，其中，所述消息的调度信息是包含在下行控制信息(Downlink Control Information，简称为DCI)中且通过物理下行控制信道(Physical Downlink Control Channel，简称为 PDCCH)和/或增强型物理下行控制信道(Enhanced Physical Downlink Control Channel，简称为EPDCCH)发送的；
所述DCI信息中还包括循环冗余校验码(Cyclic Redundancy Check，CRC)，并且所述CRC采用BI专用的接入无线网络临时标识(BI Radio Network Temporary Identity，BI-RNTI)进行加扰；加扰方式为：
ck＝(bk+ak)mod2k＝0,1,…,q
其中，bk为CRC中的第k+1个比特；ak为BI-RNTI中的第k+1个比特；ck为加扰后生成的第k+1个比特。
UE1通过解码所述消息，获得BI信息后，本实施例中，获知BI Index＝3，则UE1通过查找表1获知回退参数1(Backoff Parameter 1，BP1)＝30ms。
UE1按照下面规则获得重新发送PRACH Preamble时刻T：
(1)UE1按照下面公式确定回退参数2(Backoff Parameter 2，BP2)：
BP2＝BP1x B；
其中，B为UE1最近一次发送Preamble的重复次数，或B为UE1最近一次发送Preamble占用的子帧(Subframe)数量，或B为UE1最近一次发送Preamble占用的子帧所对应的时间；或B为UE1发送Preamble的重复次数，或B为UE1发送Preamble占用的子帧(Subframe)数量，或B为UE1发送Preamble占用的子帧所对应的时间；
(2)重新发送PRACH Preamble时刻为RAR检测窗结束后延迟T(ms)，其中，时刻T由UE1在0～BP2之间通过均匀随机选择一个时刻。
除本实施例外，
所述回退信息(backoff Indicator，BI)还可以包含在下行控制信息(Downlink Control Information，简称为DCI)中且通过物理下行控制信道(Physical Downlink Control Channel，简称为PDCCH)和/或增强型物理下行控制信道(Enhanced Physical Downlink Control Channel，简称为EPDCCH)发送。
所述DCI信息中还包括循环冗余校验码(Cyclic Redundancy Check，CRC)，并且所述CRC采用BI专用的接入无线网络临时标识(BI Radio Network Temporary Identity，BI-RNTI)进行加扰；加扰方式为：
ck＝(bk+ak)mod2k＝0,1,…,q，
其中，bk为CRC中的第k+1个比特；ak为BI-RNTI中的第k+1个比特；ck为加扰后生成的第k+1个比特。
实施例六：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝1，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信息，接下来是CEL1的随机接入响应信息，如图3所示。
UE1按顺序解码RAR消息头中的PID信息，发现有两个PID＝1的，则UE1会去尝试解码这两个PID对应的随机接入响应信息。所述随机接入响应信息中包括CEL的指示信息，则UE1找到与自己CEL相同的所述随机接入响应信息即为eNB发送给自己的随机接入响应信息。
UE1解码eNB发送给自己的随机接入响应信息获得上行延迟(UL Delay) 信息；UE1根据所述上行延迟信息确定是否延迟发送Msg3消息；本实施例中，“1”代表延迟发送，“0”代表不延迟发送。
当所述上行延迟信息指示为迟发送Msg3消息时，UE1按照下面公式确定Msg3发送的延迟时间T：
T＝D，
其中，D的取值与UE的CEL存在映射关系；或D的取值至少由UE的PUSCH重复发送次数确定。
所述Msg3消息包括以下至少之一：
无线资源控制连接请求消息(RRCConnectionRequest)，
无线资源控制连接重建请求消息(RRCConnectionReestablishmentRequest)，
无线资源控制连接重配置完成消息(RRCConnectionReconfigurationComplete)。
实施例七：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝1，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信 息，接下来是CEL1的随机接入响应信息，如图3所示。
UE1按顺序解码RAR消息头中的PID信息，发现有两个PID＝1的，则UE1会去尝试解码这两个PID对应的随机接入响应信息。所述随机接入响应信息中包括CEL的指示信息，则UE1找到与自己CEL相同的所述随机接入响应信息即为eNB发送给自己的随机接入响应信息。
UE1解码eNB发送给自己的随机接入响应信息获得上行延迟(UL Delay)信息；UE1根据所述上行延迟信息确定是否延迟发送Msg3消息；本实施例中，“1”代表延迟发送，“0”代表不延迟发送。
本实施例中，UL Delay＝0，代表不延迟发送。
UE1解码eNB发送给自己的随机接入响应信息获得Msg3消息所需的资源分配信息。
本实施例中，UE1可以发送Msg3消息的资源分布在一个或多个窄带(Narrowband)上。
所述资源分配信息的索引取值范围为0～(M-1)，由系统默认配置；每个资源分配信息索引可以指示以下至少之一：
发送Msg3消息所在的窄带信息；
发送Msg3消息所需的物理资源块数量；
发送Msg3消息所需的物理资源块索引；
发送Msg3消息所使用的调制编码方式；
Msg3消息的传输块大小(Transport Block Size，TBS)。
所述Msg3消息包括以下至少之一：
无线资源控制连接请求消息(RRCConnectionRequest)，
无线资源控制连接重建请求消息(RRCConnectionReestablishmentRequest)，
无线资源控制连接重配置完成消息(RRCConnectionReconfigurationComplete)。
实施例八：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝1，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信息，接下来是CEL1的随机接入响应信息，如图3所示。
UE1按顺序解码RAR消息头中的PID信息，发现有两个PID＝1的，则UE1会去尝试解码这两个PID对应的随机接入响应信息。所述随机接入响应信息中包括CEL的指示信息，则UE1找到与自己CEL相同的所述随机接入响应信息即为eNB发送给自己的随机接入响应信息。
UE1解码eNB发送给自己的随机接入响应信息获得上行延迟(UL Delay)信息；UE1根据所述上行延迟信息确定是否延迟发送Msg3消息；本实施例中，“1”代表延迟发送，“0”代表不延迟发送。
本实施例中，UL Delay＝0，代表不延迟发送。
UE1解码eNB发送给自己的随机接入响应信息获得Msg3消息所需的资源分配信息。
所述资源分配信息的索引取值范围为0～63，由系统默认配置，每个资源分配信息的索引与ITBS,NPRB组合有一个映射关系,其中，NPRB为Msg3消息分配 的PRB数量；ITBS为Msg3消息的TBS大小相关的变量。本实施例中，资源分配信息的索引为3，从资源分配信息的索引与ITBS,NPRB组合的映射关系表表4中可知ITBS＝0,NPRB＝4。
表4
Figure PCTCN2016070715-appb-000001
本实施例中，根据ITBS＝0,NPRB＝4，从TBS与ITBS,NPRB组合的映射关系表表5中可知Msg3消息的TBS＝88bits
表5
Figure PCTCN2016070715-appb-000002
本实施例中，发送Msg3消息所需的4个PRB的索引信息由eNB指示。
本实施例中，发送Msg3消息所使用的调制编码方式由系统默认配置。
所述Msg3消息包括以下至少之一：
无线资源控制连接请求消息(RRCConnectionRequest)，
无线资源控制连接重建请求消息(RRCConnectionReestablishmentRequest)，
无线资源控制连接重配置完成消息(RRCConnectionReconfigurationComplete)。
实施例九：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝12，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR只包含CEL0的随机接入响应信息8个，如图4所示。
UE1解码消息头中的BI信息，本实施例中，获知BI Index＝3，且CEL0可用的BI信息与回退参数1(Backoff Parameter 1，BP1)的映射表格为表1的子表，本实施例中为表7。
表6
Index Value(ms)
0 0
1 10
2 20
3 30
4 40
5 60
则UE1通过BI Index＝3并且查找表6获知回退参数1(Backoff Parameter1，BP1)＝30ms。
UE1按照下面公式确定回退时间(Backoff Time，BT)：
BT＝Backoff Parameter x A x B；
其中，A的取值与UE的CEL存在映射关系，如表2所示。
本实施例中，UE1的CEL为CEL0，则A取值为1。
其中，B为UE1最近一次发送Preamble的重复次数，或B为UE1最近一次发送Preamble占用的子帧(Subframe)数量，或B为UE1最近一次发送Preamble占用的子帧所对应的时间；或B为UE1发送Preamble的重复次数，或B为UE1发送Preamble占用的子帧(Subframe)数量，或B为UE1发送Preamble占用的子帧所对应的时间；
UE1按顺序解码RAR消息头中的PID信息，没有发现PID＝12的，则UE1需要重新发送PRACH Preamble，发送的时刻为RAR检测窗结束后延迟T(ms)，其中，时刻T由UE1在0～BT之间通过均匀随机选择一个时刻。
除本实施例外，
表1的子表还可以如表7所示。
表7
Index Value(ms)
0 0
1 40
2 80
3 120
4 240
5 480
6 960
7 1920
则UE1通过BI Index＝3并且查找表7获知回退参数1(Backoff Parameter1，BP1)＝120ms。
实施例十：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝12，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR只包含CEL0的随机接入响应信息8个，如图4所示。
本实施例中，BI索引与回退参数(Backoff Parameter，BP)的映射表格如表8、表9、表10所示，分别对应CEL0、CEL1、CEL2；
UE1解码消息头中的BI信息，本实施例中，获知BI Index＝3，则UE1通过查找表9获知回退参数(Backoff Parameter，BP)＝30ms。
表8
Index Value(ms)
0 0
1 10
2 20
3 30
4 40
5 60
6 80
7 120
8 160
9 240
10 320
11 480
12 960
13 Reserved
14 Reserved
15 Reserved
表9
Index Value(ms)
0 0
1 50
2 100
3 150
4 200
5 300
6 400
7 600
8 900
9 1200
10 1600
11 2400
12 4800
13 Reserved
14 Reserved
15 Reserved
表10
Index Value(ms)
0 0
1 100
2 200
3 300
4 400
5 600
6 800
7 1200
8 1600
9 2400
10 3200
11 4800
12 9600
13 Reserved
14 Reserved
15 Reserved
UE1按顺序解码RAR消息头中的PID信息，没有发现PID＝12的，则UE1需要重新发送PRACH Preamble，发送的时刻为RAR检测窗结束后延迟T(ms)，其中，时刻T由UE1在0～BP之间通过均匀随机选择一个时刻。
实施例十一：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝1，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信 息，接下来是CEL1的随机接入响应信息，如图3所示。
UE1按顺序解码RAR消息头中的PID信息，发现有两个PID＝1的，则UE1会去尝试解码这两个PID对应的随机接入响应信息。所述随机接入响应信息中包括CEL的指示信息，则UE1找到与自己CEL相同的所述随机接入响应信息即为eNB发送给自己的随机接入响应信息。
UE1解码eNB发送给自己的随机接入响应信息获得上行延迟(UL Delay)信息；UE1根据所述上行延迟信息确定是否延迟发送Msg3消息,包括以下步骤至少之一：
预先定义上行延迟(UL Delay)信息与延迟发送的时间T的映射表格，其中，不同的CEL对应的所述映射表格不同。
UE首先根据CEL等级信息选择相应的所述映射表格；然后在选择的所述映射表格中，根据所述上行延迟(UL Delay)信息获得延迟发送的时间T。
获得延迟发送的时间T为0时，指示UE不使能延迟发送Msg3消息。
本实施例中，UE首先根据自己CEL等级CEL0选择相应的所述映射表格，例如为表11。
表11
Index Value(ms)
0 0
1 2
2 4
3 8
本实施例中，(UL Delay)信息为“2”，则UE1通过表11可以获知Msg3消息发送的延迟时间T＝4ms；
则UE1在第一个可以发送Msg3消息的子帧后，延迟4ms之后的第一个可用上行子帧上发送Msg3消息。
所述Msg3消息包括以下至少之一：
无线资源控制连接请求消息(RRCConnectionRequest)，
无线资源控制连接重建请求消息(RRCConnectionReestablishmentRequest)，
无线资源控制连接重配置完成消息(RRCConnectionReconfigurationComplete)。
实施例十二：
在LTE系统中存在MTC UEs，并且MTC UEs可以支持覆盖增强(Coverage Enhancement，CE)。本实施例中，PRACH一共支持3个覆盖增强级别(Coverage Enhancement level，CEL)，即CEL0、CEL1和CEL2。且UE1为CEL0的MTC UE，UE2为CEL1的MTC UE，UE3为CEL2的MTC UE。基站(eNB)为每个CEL的MTC UE分配PRACH资源，包括发送随机接入信令所使用的随机接入序列(Preamble)以及发送Preamble所使用的子帧(Subframe)以及物理资源块(PRB)。可以采用时分复用和/或频分复用和/或码分复用的方式为MTC UE分配PRACH资源。
本实施例中，UE1按照eNB的配置信息在PRACH上发送Preamble，Preamble索引为PID＝1，然后UE1需要接收eNB发送的随机接入响应信息，所述随机接入响应信息在RAR中发送。
本实施例中，RAR中CEL0的随机接入响应信息有5个，CEL1的随机接入响应信息有3个；并且在RAR中随机接入响应信息的排列顺序为：按照CEL由低到高顺序排列。则本实施例中，首先是CEL0的随机接入响应信息，接下来是CEL1的随机接入响应信息，如图3所示。
UE1按顺序解码RAR消息头中的PID信息，发现有两个PID＝1的，则UE1会去尝试解码这两个PID对应的随机接入响应信息。所述随机接入响应信息中包括CEL的指示信息，则UE1找到与自己CEL相同的所述随机接入响应信息即为eNB发送给自己的随机接入响应信息。
UE1解码eNB发送给自己的随机接入响应信息获得上行延迟(UL Delay)信息；UE1根据所述上行延迟信息确定是否延迟发送Msg3消息；本实施例中，“1”代表延迟发送，“0”代表不延迟发送。
本实施例中；UL Delay＝0，代表不延迟发送。
UE1解码eNB发送给自己的随机接入响应信息获得Msg3消息所需的资源分配信息。
所述资源分配信息的索引取值范围为0～(M-1)，由系统默认配置；每个资源分配信息索引可以指示以下至少之一：
发送Msg3消息所需的物理资源块数量；
发送Msg3消息所需的物理资源块索引；
发送Msg3消息所使用的调制编码方式；
Msg3消息的传输块大小(Transport Block Size，TBS)。
所述Msg3消息包括以下至少之一：
无线资源控制连接请求消息(RRCConnectionRequest)，
无线资源控制连接重建请求消息(RRCConnectionReestablishmentRequest)，
无线资源控制连接重配置完成消息(RRCConnectionReconfigurationComplete)。
本实施例中，UE1可以发送Msg3消息的资源分布在一个或多个窄带(Narrowband)上。
UE1发送Msg3消息所占用的Narrowband位置信息由以下至少之一确定：
在UE1的随机接入响应信息中指示；
与UE1发送Preamble占用相同的Narrowband；
由UE1发送Preamble占用的Narrowband确定。
其中，由UE1发送Preamble占用的Narrowband确定UE1发送Msg3消息所占用的Narrowband，包括：
假设由UE1发送Preamble占用的Narrowband索引为Index A，则UE1 发送Msg3消息所占用的Narrowband的索引为Index(A+K)，其中K由标准默认配置或者由eNB配置。
本实施例中，UE1的下行控制信息(Downlink Control Information，简称为DCI)的用户专用检测空间(UE-specific search space，USS)所在的Narrowband位置信息在UE1发送的Msg3消息中上报。
除本实施例外，
UE1的下行控制信息(Downlink Control Information，简称为DCI)的用户专用检测空间(UE-specific search space，USS)所在的Narrowband位置信息还可以在eNB发送给UE1的随机接入响应信息中指示。
实施例十三
如图5所示，本发明实施例提供了一种随机接入响应消息发送方法，包括：
步骤501，第一类节点通过下行信道发送随机接入响应消息(RAR)，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。
在所述步骤501之前，该方法还包括：
步骤500，第一类节点接收第二类节点发送的随机接入信令。
可选的，所述RAR的调度信息包含在下行控制信息(DCI)中且通过物理下行控制信道(PDCCH)和/或增强型物理下行控制信道(EPDCCH)发送。
可选的，所述RAR的调度信息中包括N个等级的第二类节点的随机接入响应信息在所述RAR中的资源分配信息，N大于等于1。
可选的，所述资源分配信息通过第一索引信息指示，所述第一索引信息由K个bit描述，K大于等于1。
可选的，通过所述第一索引信息指示以下信息中的任一或任意多个：
在所述RAR中发送的随机接入响应信息所属的所述第二类节点的等级数量信息，
在所述RAR中发送的随机接入响应信息所属的所述第二类节点的等级索引信息，
在所述RAR中支持的发送给每个所述等级的所述第二类节点的随机接入响应信息的数量信息，
在所述RAR中支持的发送给每个所述等级的所述第二类节点的随机接入响应信息的数量占所述RAR中一共可以支持的随机接入响应信息数量的比例信息。
此外，所述第二类节点的随机接入响应信息中包括所述第二类节点的所述等级信息。
可选的，回退指示(BI)索引信息在所述RAR中发送。
可选的，所述第二类节点根据所述BI索引信息获得第一回退参数(BP)，其中所述BI索引信息与所述第一BP的映射关系由标准默认配置。
可选的，所述第二类节点按照以下任一表达式确定第二BP：
第二BP＝第一BP x A x B，
第二BP＝第一BP x A，
第二BP＝第一BP x B，
第二BP＝第一BP，
其中，A的取值与所述第二类节点的所述等级存在映射关系，
B为所述第二类节点最近一次发送Preamble的重复次数或所述第二类节点最近一次发送Preamble的占用的子帧(Subframe)数量或所述第二类节点最近一次发送Preamble的占用的Subframe所对应的时间或所述第二类节点发送Preamble的重复次数或所述第二类节点发送Preamble的占用的Subframe数量或所述第二类节点发送Preamble的占用的Subframe所对应的时间。
可选的，当所述RAR中只携带一个所述第二类节点的随机接入响应信息时，所述BI索引信息在系统信息(SI)中指示。
可选的，当所述RAR中只携带一个所述第二类节点的随机接入响应信 息时，所述BI索引信息由所述第一类节点通过消息发送，其中，所述消息的调度信息包含在DCI中且通过PDCCH和/或EPDCCH发送。
可选的，所述DCI中还包括循环冗余校验码(CRC)，并且所述CRC采用BI专用的接入无线网络临时标识(RNTI)进行加扰。
可选的，当所述RAR中只携带一个所述第二类节点的随机接入响应信息时，所述BI索引信息包含在DCI中且通过PDCCH和/或EPDCCH发送的。
可选的，所述DCI中还包括CRC，并且所述CRC采用BI专用的RNTI进行加扰。
可选的，
所述BI索引信息在RAR中发送。
可选的，还可以预先定义BI索引信息与BP的映射表格，其中，不同等级对应的映射表格不同。此种情况下，所述第二类节点首先根据所述等级信息选择相应的映射表格，然后在选择的映射表格中，根据所述BI索引信息获得相应的BP。
可选的，还可以将不同等级的所述第二类节点的BI索引信息与BP的映射关系预先定义在同一映射表格中。此种情况下，不同等级的所述第二类节点的BI索引信息的取值范围由所述第一类节点通知或者通过预定义的方式确定。
可选的，不同等级的所述第二类节点的BI索引信息的取值范围可以有交集。
此外，所述第二类节点的随机接入响应信息中包括所述第二类节点的上行延迟(UL Delay)信息，该方法还包括：
所述第二类节点根据所述UL Delay信息确定是否延迟发送Msg3消息。
可选的，当所述UL Delay信息指示为延迟发送Msg3消息时，所述第二类节点按照下面表达式确定Msg3消息发送的延迟时间T:
T＝D，
其中，D的取值与所述第二类节点的所述等级存在映射关系，由所述第二类节点的PUSCH的重复发送次数确定，D的度量单位为Subframe或帧(Frame)。
可选的，所述第二类节点根据UL Delay信息确定Msg3消息延迟发送的时间T，包括：
预先定义UL Delay信息与延迟发送的时间T的映射表格，其中，不同的所述等级对应的所述映射表格不同；
所述第二类节点首先根据所述等级信息选择相应的所述映射表格，然后在选择的所述映射表格中，根据所述UL Delay信息获得延迟发送的时间T。
可选的，获得延迟发送的时间T为0时，指示所述第二类节点不使能延迟发送Msg3消息。
可选的，所述Msg3消息至少包括以下之一：
无线资源控制连接请求消息(RRCConnectionRequest)，
无线资源控制连接重建请求消息(RRCConnectionReestablishmentRequest)，
无线资源控制连接重配置完成消息(RRCConnectionReconfigurationComplete)。
可选的，所述第二类节点的随机接入响应信息中包括所述第二类节点发送Msg3消息所需的资源分配信息。
可选的，所述资源分配信息的索引为0至M-1，每个资源分配信息的索引指示以下任一或任意多项内容：
发送Msg3消息所需的物理资源块数量，
发送Msg3消息所需的物理资源块索引，
发送Msg3消息所使用的调制编码方式，
Msg3消息的传输块大小(TBS)。
可选的，所述第二类节点发送Msg3消息所占用的频带位置信息由以下 方式中至少之一确定：
采用预定义的方式确定，
在所述第二类节点的随机接入响应信息中指示，
与所述第二类节点发送的所述随机接入信令占用相同的频带，
由所述第二类节点发送的所述随机接入信令占用的频带确定，
可选的，所述由所述第二类节点发送的所述随机接入信令占用的频带确定为：
所述第二类节点发送的所述随机接入信令占用的频带与所述第二类节点发送Msg3消息所占用的频带存在映射关系，根据该映射关系确定发送Msg3消息所占用的频带位置信息，所述映射关系由标准默认配置或者由所述第一类节点发送给所述第二类节点。
此外，所述第二类节点的DCI的用户专用检测空间(UE-specific search space，USS)所在的频带位置信息在所述第二类节点的随机接入响应信息中指示。
可选的，所述第二类节点的DCI的用户专用检测空间(UE-specific search space，USS)所在的频带位置信息由所述第二类节点在Msg3中上报；
可选的，本发明实施例中涉及的所述第二类节点的等级包括以下至少之一：
覆盖增强等级，
PRACH信道覆盖增强等级，
PRACH信道重复发送等级。
所述第一类节点为任一下列设备：
宏基站(Macrocell)、微基站(Microcell)、微微基站(Picocell)、毫微微基站(Femtocell)、低功率节点(LPN)、中继站(Relay)。
所述第二类节点为任一下列设备：
一个或多个人到人(H2H)通信终端，
一个或多个机器到机器(M2M)通信终端，
一个或多个设备到设备(D2D)通信终端，
一个或多个机器类型通信(MTC)通信终端。
实施例十四
本发明实施例提供了一种节点，其结构如图6所示，包括：
响应消息发送模块601，设置为：通过下行信道发送RAR，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。
可选的，该节点还包括：
信令接收模块600，设置为：接收所述第二类节点发送的随机接入信令。
使用上述节点作为第一类节点完成RAR发送的流程参见本发明的实施例一至十三。
上述节点可集成于任一下列设备中：
Macrocell、Microcell、Picocell、Femtocell、LPN、Relay。
本发明的实施例提供了一种RAR方法和节点，第一类节点通过下行信道发送RAR，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。实现了RAR的增强设计，解决了RAR增强设计的问题。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。
上述实施例中的装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
工业实用性
通过本发明实施例，实现了RAR的增强设计，解决了RAR增强设计的问题。

Claims (30)

  1. 一种随机接入响应消息发送方法，包括：
    第一类节点通过下行信道发送随机接入响应消息(RAR)，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。
  2. 根据权利要求1所述的随机接入响应消息发送方法，其中，所述第一类节点通过下行信道发送RAR的步骤之前，还包括：
    所述第一类节点接收所述第二类节点发送的随机接入信令。
  3. 根据权利要求1所述的随机接入响应消息发送方法，该方法还包括：所述RAR的调度信息包含在下行控制信息(DCI)中且通过物理下行控制信道(PDCCH)和/或增强型物理下行控制信道(EPDCCH)发送；
    所述RAR的调度信息中包括N个等级的第二类节点的随机接入响应信息在所述RAR中的资源分配信息，N大于等于1。
  4. 根据权利要求3所述的随机接入响应消息发送方法，其中，所述资源分配信息通过第一索引信息指示，所述第一索引信息由K个比特描述，K大于等于1；
    通过所述第一索引信息指示以下信息中的任一或任意多个：
    在所述RAR中发送的随机接入响应信息所属的所述第二类节点的等级数量信息，
    在所述RAR中发送的随机接入响应信息所属的所述第二类节点的等级索引信息，
    在所述RAR中支持的发送给每个所述等级的所述第二类节点的随机接入响应信息的数量信息，
    在所述RAR中支持的发送给每个所述等级的所述第二类节点的随机接入响应信息的数量占所述RAR中一共可以支持的随机接入响应信息数量的比例信息。
  5. 根据权利要求1所述的随机接入响应消息发送方法，其中，
    所述第二类节点的随机接入响应信息中包括所述第二类节点的等级信息。
  6. 根据权利要求1所述的随机接入响应消息发送方法，该方法还包括：
    所述第一类节点向所述第二类节点发送回退指示(BI)索引信息。
  7. 根据权利要求6所述的随机接入响应消息发送方法，其中，
    所述BI索引信息在所述RAR中发送。
  8. 根据权利要求7所述的随机接入响应消息发送方法，该方法还包括：所述第二类节点根据所述BI索引信息获得第一回退参数(BP)，其中所述BI索引信息与所述第一BP的映射关系由标准默认配置；
    所述第二类节点按照以下任一表达式确定第二BP：
    第二BP＝第一BPxAxB，
    第二BP＝第一BPxA，
    第二BP＝第一BPxB，
    第二BP＝第一BP，
    其中，A的取值与所述第二类节点的等级存在映射关系，
    B为所述第二类节点最近一次发送随机接入序列的重复次数或所述第二类节点最近一次发送随机接入序列的占用的子帧数量或所述第二类节点最近一次发送随机接入序列的占用的子帧所对应的时间或所述第二类节点发送随机接入序列的重复次数或所述第二类节点发送随机接入序列的占用的子帧数量或所述第二类节点发送随机接入序列的占用的子帧所对应的时间。
  9. 根据权利要求6所述的随机接入响应消息发送方法，其中，当所述RAR中只携带一个所述第二类节点的随机接入响应信息时，所述BI索引信息在系统信息(SI)中指示。
  10. 根据权利要求6所述的随机接入响应消息发送方法，其中，所述BI索引信息由所述第一类节点通过消息发送，其中，所述消息的调度信息包含在DCI中且通过PDCCH和/或EPDCCH发送；
    所述DCI中还包括循环冗余校验码(CRC)，并且所述CRC采用BI专用的接入无线网络临时标识(RNTI)进行加扰。
  11. 根据权利要求6所述的随机接入响应消息发送方法，其中，所述BI索引信息包含在DCI中且通过PDCCH和/或EPDCCH发送；
    所述DCI中还包括CRC，并且所述CRC采用BI专用的RNTI进行加扰。
  12. 根据权利要求10或11所述的随机接入响应消息发送方法，其中，所述RAR中只携带一个所述第二类节点的随机接入响应信息。
  13. 根据权利要求7所述的随机接入响应消息发送方法，该方法还包括：
    预先定义BI索引信息与BP的映射表格，其中，不同等级对应的映射表格不同。
  14. 根据权利要求13所述的随机接入响应消息发送方法，该方法还包括：
    所述第二类节点根据等级信息选择相应的映射表格，在选择的映射表格中，根据所述BI索引信息获得相应的BP。
  15. 根据权利要求13所述的随机接入响应消息发送方法，其中，
    不同等级的所述第二类节点的BI索引信息与BP的映射关系预先定义在同一映射表格中；
    不同等级的所述第二类节点的BI索引信息的取值范围由所述第一类节点通知或者通过预定义的方式确定。
  16. 根据权利要求15所述的随机接入响应消息发送方法，其中，不同等级的所述第二类节点的BI索引信息的取值范围有交集。
  17. 根据权利要求1所述的随机接入响应消息发送方法，其中，所述第二类节点的随机接入响应信息中包括所述第二类节点的上行延迟信息，该方法还包括：
    所述第二类节点根据所述上行延迟信息确定是否延迟发送Msg3消息。
  18. 根据权利要求17所述的随机接入响应消息发送方法，该方法还包括：当所述上行延迟信息指示为延迟发送Msg3消息时，所述第二类节点按照下面表达式确定Msg3消息发送的延迟时间T:
    T＝D，
    其中，D的取值与所述第二类节点的等级存在映射关系，由所述第二类节点的PUSCH的重复发送次数确定，D的度量单位为子帧或帧。
  19. 根据权利要求18所述的随机接入响应消息发送方法，该方法还包括：
    预先定义上行延迟信息与延迟发送的时间T的映射表格，其中，不同的所述等级对应的所述映射表格不同；
    所述第二类节点根据所述等级信息选择相应的所述映射表格，在选择的所述映射表格中，根据所述上行延迟信息获得延迟发送的时间T；所述第二类节点获得延迟发送的时间T为0时，指示所述第二类节点不使能延迟发送Msg3消息。
  20. 根据权利要求17所述的随机接入响应消息发送方法，其中，所述Msg3消息至少包括以下之一：
    无线资源控制连接请求消息，
    无线资源控制连接重建请求消息，
    无线资源控制连接重配置完成消息。
  21. 根据权利要求1所述的随机接入响应消息发送方法，其中，
    所述第二类节点的随机接入响应信息中包括所述第二类节点发送Msg3消息所需的资源分配信息。
  22. 根据权利要求21所述的随机接入响应消息发送方法，其中，所述资源分配信息的索引为0至M-1，每个资源分配信息的索引指示以下任一或任意多项内容：
    发送Msg3消息所需的物理资源块数量，
    发送Msg3消息所需的物理资源块索引，
    发送Msg3消息所使用的调制编码方式，
    Msg3消息的传输块大小(TBS)。
  23. 根据权利要求21所述的随机接入响应消息发送方法，其中，所述第二类节点发送Msg3消息所占用的频带位置信息由以下方式中至少之一确定：
    采用预定义的方式确定，
    在所述第二类节点的随机接入响应信息中指示，
    与所述第二类节点发送的所述随机接入信令占用相同的频带，
    由所述第二类节点发送的所述随机接入信令占用的频带确定。
  24. 根据权利要求23所述的随机接入响应消息发送方法，其中，所述由所述第二类节点发送的所述随机接入信令占用的频带确定包括：
    所述第二类节点发送的所述随机接入信令占用的频带与所述第二类节点发送Msg3消息所占用的频带存在映射关系，根据该映射关系确定发送Msg3消息所占用的频带位置信息，所述映射关系由标准默认配置或者由所述第一类节点发送给所述第二类节点。
  25. 根据权利要求1所述的随机接入响应消息发送方法，其中，所述第二类节点的DCI的用户专用检测空间所在的频带位置信息在所述第二类节点的随机接入响应信息中指示。
  26. 根据权利要求25所述的随机接入响应消息发送方法，其中，所述第二类节点的DCI的用户专用检测空间所在的频带位置信息由所述第二类节点在Msg3消息中上报。
  27. 根据权利要求3、4、5、8、14、15、16、19中任一项所述的随机接入响应消息发送方法，其中，所述第二类节点的等级包括以下至少之一：
    覆盖增强等级，
    PRACH信道覆盖增强等级，
    PRACH信道重复发送等级。
  28. 根据权利要求1所述的随机接入响应消息发送方法，其中，所述第一类节点为任一下列设备：
    宏基站(Macrocell)、微基站(Microcell)、微微基站(Picocell)、毫微微基站(Femtocell)、低功率节点(LPN)、中继站(Relay)；
    所述第二类节点为任一下列设备：
    一个或多个人到人(H2H)通信终端，
    一个或多个机器到机器(M2M)通信终端，
    一个或多个设备到设备(D2D)通信终端，
    一个或多个机器类型通信(MTC)通信终端。
  29. 一种节点，包括：
    响应消息发送模块，设置为：通过下行信道发送RAR，在所述RAR中携带一个或多个第二类节点的随机接入响应信息。
  30. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1-28任一项的方法。
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