WO2017035698A1 - Prach前导的发送方法、设备及系统 - Google Patents

Prach前导的发送方法、设备及系统 Download PDF

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Publication number
WO2017035698A1
WO2017035698A1 PCT/CN2015/088393 CN2015088393W WO2017035698A1 WO 2017035698 A1 WO2017035698 A1 WO 2017035698A1 CN 2015088393 W CN2015088393 W CN 2015088393W WO 2017035698 A1 WO2017035698 A1 WO 2017035698A1
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WO
WIPO (PCT)
Prior art keywords
starting
prach preamble
access slot
slot information
repetitions
Prior art date
Application number
PCT/CN2015/088393
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English (en)
French (fr)
Inventor
黄雯雯
赵悦莹
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2015/088393 priority Critical patent/WO2017035698A1/zh
Priority to EP15902505.5A priority patent/EP3316649B1/en
Priority to CN201580035188.6A priority patent/CN107006031B/zh
Publication of WO2017035698A1 publication Critical patent/WO2017035698A1/zh
Priority to US15/906,951 priority patent/US10499439B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
    • H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a method, a device, and a system for transmitting a preamble of a physical random access channel (PRACH).
  • PRACH physical random access channel
  • the user equipment (UE, User Equipment) needs to initiate a random access procedure before performing data transmission with the base station.
  • the UE needs to randomly select an access slot (AS, Access slot) from the random access channel (RACH) subchannel available to the UE in the random access process, and pass the AS through the AS.
  • AS access slot
  • RACH random access channel
  • the base station cannot distinguish the PRACH preambles sent by different UEs, resulting in UE access failures using the same signature sequence.
  • the UE transmits the same PRACH preamble in multiple ASs, so that the base station can combine the multiple repeated information and achieve the effect of improving the coverage by combining the gains.
  • multiple UEs are used to send an increase in the PRACH preamble probability to the base station on the same AS using the same signature sequence.
  • the embodiment of the invention provides a method, a device and a system for transmitting a PRACH preamble.
  • an embodiment of the present invention provides a method for transmitting a PRACH preamble of a physical random access channel, including:
  • the controller determines the access slot information according to the at least one PRACH preamble repetition number; the access slot information includes a start access slot AS corresponding to each random access channel RACH subchannel, and the start AS starts.
  • the number of PRACH preamble repetitions is used by the same user equipment UE. Send the same PRACH preamble;
  • the controller sends the access slot information to each UE, so that each UE repeatedly sends a PRACH preamble to the base station according to the access slot information.
  • the number of the RACH subchannels is at least one.
  • the starting AS corresponding to each random access channel RACH subchannel is specifically:
  • the SFN indicates the number of the PRACH preamble repetitions corresponding to the starting AS.
  • the starting AS indicates that the starting AS corresponds The number of PRACH preamble repetitions.
  • an embodiment of the present invention provides a method for transmitting a PRACH preamble of a physical random access channel, including:
  • the user equipment UE receives the access slot information sent by the controller;
  • the access slot information includes a starting access slot AS corresponding to each random access channel RACH subchannel, and the PRACH preamble repetition started by the starting AS
  • the number of ASs is used by the same UE to send the same PRACH preamble;
  • the UE repeatedly sends a PRACH preamble to the base station according to the access slot information.
  • the number of the RACH subchannels is at least one.
  • the starting AS corresponding to each random access channel RACH subchannel is specifically:
  • the SFN indicates the PRACH preamble repetition number corresponding to the starting AS.
  • the starting AS indicates that the starting AS corresponds to of The number of PRACH preamble repetitions.
  • the UE in a fifth possible implementation manner of the second aspect, the UE, according to the access slot information, Repeatly transmitting the PRACH preamble to the base station, including:
  • the UE determines that the number of repetitions of the PRACH preamble is N; where N is a positive integer greater than or equal to 1;
  • the N ASs starting at the first start AS of the UE repeatedly send N the PRACH preambles to the base station.
  • an embodiment of the present invention provides a controller, where the controller includes:
  • a processing module configured to determine access slot information according to at least one PRACH preamble repetition number; the access slot information includes a start access slot AS corresponding to each random access channel RACH subchannel, the start The number of the PRACH preamble repetitions initiated by the AS is used by the same user equipment UE to send the same PRACH preamble;
  • a sending module configured to send the access slot information to each UE, so that each UE repeatedly sends a PRACH preamble to the base station according to the access slot information.
  • the number of the RACH subchannels is at least one.
  • the starting AS corresponding to each random access channel RACH subchannel is specifically:
  • the SFN indicates the PRACH preamble repetition number corresponding to the starting AS.
  • the starting AS indicates the initial AS corresponding The number of PRACH preamble repetitions.
  • an embodiment of the present invention provides a user equipment UE, where the user equipment includes:
  • a receiving module configured to receive access slot information sent by the controller; the access slot information packet
  • the initial access slot AS corresponding to each random access channel RACH subchannel, the number of PRACH preamble repetitions starting from the starting AS is used by the same UE to send the same PRACH preamble;
  • a sending module configured to repeatedly send the PRACH preamble to the base station according to the access slot information.
  • the number of the RACH subchannels is at least one.
  • the starting AS corresponding to each random access channel RACH subchannel is specifically:
  • the SFN indicates the PRACH preamble repetition number corresponding to the starting AS.
  • the starting AS indicates that the starting AS corresponds to The number of PRACH preamble repetitions.
  • the sending module is specifically configured to:
  • N is a positive integer greater than or equal to 1;
  • the N ASs starting at the first start AS repeatedly send N the PRACH preambles to the base station.
  • an embodiment of the present invention provides a system for transmitting a PRACH preamble of a physical random access channel, including: the controller of any one of the first to fourth aspects of the third aspect or the third aspect, and The user equipment UE of any of the first to fifth aspects of the fourth aspect or the fourth aspect.
  • an embodiment of the present invention provides a controller, where the controller includes:
  • a processor configured to determine access slot information according to at least one PRACH preamble repetition number; the access slot information includes a start access slot AS corresponding to each random access channel RACH subchannel, the start The number of the PRACH preamble repetitions initiated by the AS is used by the same user equipment UE to send the same PRACH preamble;
  • a transmitter configured to send the access slot information to each UE, so that each UE is configured according to the The access slot information is repeatedly sent to the base station to transmit a PRACH preamble.
  • the number of the RACH subchannels is at least one.
  • the starting AS corresponding to each random access channel RACH subchannel is specifically:
  • the SFN indicates the PRACH preamble repetition number corresponding to the starting AS.
  • the starting AS indicates that the starting AS corresponds to The number of PRACH preamble repetitions.
  • the seventh aspect of the present invention provides a user equipment UE, where the user equipment includes:
  • a receiver configured to receive access slot information sent by the controller;
  • the access slot information includes a start access slot AS corresponding to each random access channel RACH subchannel, and the PRACH starting from the start AS The number of preamble repetitions is used by the same UE to send the same PRACH preamble;
  • a processor configured to determine, according to the access slot information, a number of PRACH preamble repetitions starting at the first starting AS, and the AS repeatedly sends a PRACH preamble to the base station;
  • the number of the RACH subchannels is at least one.
  • the starting AS corresponding to each random access channel RACH subchannel is specifically:
  • the SFN indicates the PRACH preamble repetition number corresponding to the starting AS.
  • the starting AS indicates the initial AS corresponding of The number of PRACH preamble repetitions.
  • the processor is specifically configured to determine a PRACH preamble The number of repetitions is N; wherein, N is a positive integer greater than or equal to 1; determining, according to the access slot information, the number of PRACH preamble repetitions corresponding to the first starting AS is N;
  • the transmitter specifically, the N ASs starting at the first start AS repeatedly send N the PRACH preambles to the base station.
  • the present invention provides a method, device, and system for transmitting a PRACH preamble; determining, by the controller, access slot information according to at least one PRACH preamble repetition number; the access slot information including a starting AS corresponding to each RACH subchannel
  • the number of the PRACH preamble repetitions starting from the start AS is used by the same UE to send the same PRACH preamble; the controller sends the access slot information to each UE, so that the UEs according to the The access slot information is repeatedly sent to the base station to send the PRACH preamble; the number of PRACH preamble repetitions starting from the AS is used by the same UE to repeatedly send the PRACH preamble to the base station; and the collision opportunity is solved due to the repeated transmission of the PRACH preamble. Increased problem; thus reducing the probability of access failure.
  • 1 is a correspondence diagram of a prior art RACH subchannel and an AS
  • FIG. 2 is a schematic diagram of a failure of UE access caused by repeated transmission of a PRACH preamble in the prior art
  • Embodiment 3 is a flowchart of Embodiment 1 of a method for transmitting a PRACH preamble according to the present invention
  • Embodiment 4 is a flowchart of Embodiment 2 of a method for transmitting a PRACH preamble according to the present invention
  • FIG. 5 is a first correspondence diagram of a RACH subchannel and a starting AS according to the present invention.
  • FIG. 6 is a second correspondence diagram of a RACH subchannel and a starting AS according to the present invention.
  • FIG. 7 is a third diagram of a correspondence between a RACH subchannel and a starting AS according to the present invention.
  • FIG. 8 is a fourth correspondence diagram of a RACH subchannel and a starting AS according to the present invention.
  • FIG. 9 is a diagram 5 of a correspondence between a RACH subchannel and a starting AS according to the present invention.
  • FIG. 10 is a schematic structural diagram of Embodiment 1 of a controller according to the present invention.
  • Embodiment 1 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • Embodiment 12 is a schematic structural diagram of Embodiment 2 of a controller according to the present invention.
  • FIG. 13 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention.
  • the UE needs to randomly select an AS from the RACH subchannels available to the UE in the random access process.
  • the correspondence between the RACH subchannel and the AS is shown in Table 1. It should be noted that in Table 1 0-11 in the row immediately adjacent to the RACH subchannel number indicates 12 RACH subchannels respectively, and 0-7 in the same column as "SFN%8" respectively indicate 8 after the system frame number (SFN, System FrameNumber) modulo 8. The remainder, the other numbers 0-14 are used to indicate the number of the AS.
  • Figure 1 is a diagram showing the correspondence between the RACH sub-channel and the AS in the prior art. The meanings shown in Figure 1 are similar to those in Table 1, and are not described here.
  • FIG. 2 is a schematic diagram of a UE PR access failure caused by a PRACH preamble repeated transmission; assuming that there are 2 UEs (for example, UE1 and UE2) in the prior art, a random access needs to be initiated; UE1 selects a 0th AS in SFN0. (ie, AS0) transmits PRACH preamble 1 (represented by the region in which preamble 1 is filled by diagonal stripes in FIG. 2), and repeatedly transmits PRACH preamble 1 in the first AS (ie, AS1); UE2 selects 1st in SFN0.
  • UEs for example, UE1 and UE2
  • the ASs also send the PRACH preamble 1; as shown in Figure 2, UE1 and UE2 collide at the location of the first AS, and the base station cannot distinguish between the PRACH preambles sent by UE1 and UE2, resulting in UE1 and UE2 access failure.
  • the method for repeating PRACH preamble transmission shown in FIG. 2 is that the UE separately transmits the same PRACH preamble at the starting positions of consecutive ASs (for example, if the number of PRACH preamble repetitions is 4, four consecutive fours are needed. The beginning of the AS sends the same PRACH preamble).
  • the method of the present invention can also be applied to the UE starting at the beginning of an AS, and transmitting the same PRACH preamble multiple times in succession (for example, if the PRACH preamble repetition number is 4, the same PRACH preamble needs to be consecutive at the beginning position of an AS. Sent 4 times).
  • Embodiment 3 is a flowchart of Embodiment 1 of a method for transmitting a PRACH preamble according to the present invention; as shown in FIG. 3, the method in this embodiment may include:
  • Step 301 The controller determines access slot information according to the at least one PRACH preamble repetition number, where the access slot information includes a starting AS corresponding to each RACH subchannel, and the PRACH preamble repetition started by the starting AS The number of ASs is used by the same UE to send the same PRACH preamble;
  • N-1 (N is the number of repetitions) ASs after the start of the AS are all unavailable start ASs, that is, the UE cannot initiate access in the N-1 ASs.
  • the controller may be a radio network controller (RNC).
  • RNC radio network controller
  • Step 302 The controller sends the access slot information to each UE, so that each UE repeatedly sends a PRACH preamble to the base station according to the access slot information.
  • the controller determines the access slot information according to the at least one PRACH preamble repetition number; the access slot information includes a start AS corresponding to each RACH subchannel;
  • the PRACH preamble repetition number AS is used by the same UE to send the same PRACH preamble; the controller sends the access slot information to each UE, so that the UEs repeatedly send to the base station according to the access slot information.
  • PRACH preamble; the number of PRACH preamble repetitions starting AS is used for the same UE to repeatedly send the PRACH preamble to the base station; solving the problem that the collision opportunity is increased due to the repeated transmission of the PRACH preamble; thereby reducing the access The probability of failure.
  • Embodiment 4 is a flowchart of Embodiment 2 of a method for transmitting a PRACH preamble according to the present invention; as shown in FIG. 4, the method in this embodiment may include:
  • Step 401 The UE receives the access slot information sent by the controller.
  • the access slot information includes a start access slot AS corresponding to each RACH subchannel, and the PRACH preamble repetition number AS of the starting AS starts. Used by the same UE to send the same PRACH preamble;
  • Step 402 The UE repeatedly sends a PRACH preamble to the base station according to the access slot information.
  • the access slot information sent by the controller is received by the UE; the access slot information includes a starting access slot AS corresponding to each RACH subchannel number; and the PRACH preamble starting from the starting AS.
  • the number of repetitions of the AS is used by the same UE to send the same PRACH preamble; the UE repeatedly sends the PRACH preamble to the base station according to the access slot information; and the number of PRACH preamble repetitions starting AS of the starting AS is used for the UE direction.
  • the base station repeatedly transmits the PRACH preamble; solves the problem that the collision opportunity increases due to repeated transmission of the PRACH preamble; thereby reducing the probability of access failure.
  • This embodiment is an example for the controller to determine access slot information according to a PRACH preamble repetition number.
  • Scenario 1 Assume that the number of the AS is 0-14, the number of PRACH preamble repetitions is 8; the number of RACH subchannels is 12, and the numbers are 0-11.
  • the access slot information may be specifically as shown in Table 2. 0-11 in the row immediately adjacent to the "RACH subchannel number” in Table 2 respectively represents 12 RACH subchannels, and 0-15 in the same column as "SFN%16" respectively represent 16 remainders after the SFN modulo 16, The other numbers 0-14 are used to indicate the number of the starting AS.
  • FIG. 5 is a first embodiment of the relationship between the RACH subchannel and the starting AS of the present invention, and the meanings shown in FIG. 5 are similar to those in Table 2, and details are not described herein again.
  • the period of the SFN may be determined by multiplying by the least common multiple of the number of RACH subchannels, the number of ASs, and the number of repetitions of the PRACH by 2, and dividing by the number of ASs. For example, when the number of RACH subchannels is equal to 12, the number of ASs is equal to 15, and the number of PRACH repetitions is equal to 8, The least common multiple of the three is 120, 120 times 2 and then divided by 15 equals 16.
  • Scenario 2 Assume that the number of PRACH preamble repetitions is 4, and other conditions are the same as those of Table 2.
  • the access slot information may be specifically as shown in Table 3.
  • FIG. 6 is a diagram showing the correspondence between the RACH subchannel and the starting AS according to the present invention. The meanings shown in FIG. 6 are similar to those in Table 3, and details are not described herein again.
  • Scenario 3 Assume that the number of PRACH preamble repetitions is 2, and other conditions are the same as those of Table 2.
  • the access slot information may be specifically as shown in Table 4.
  • FIG. 7 is a third embodiment of the relationship between the RACH subchannel and the starting AS of the present invention, and the meanings shown in FIG. 7 are similar to those in Table 4, and details are not described herein again.
  • the length of one RACH subchannel in Table 2 to Table 4 is the same as the length of one AS (for example, both are 5120 chips).
  • the length of one RACH subchannel number may also be an integer multiple of an AS length; as shown in Table 5-7 below.
  • Scenario 4 Assume that the number of the AS is 0-14; the number of PRACH preamble repetitions is 8; the length of one PRACH subchannel is 8 times the length of one AS; the number of RACH subchannels is 1 (where 1 is equal to 12 divided by 8 and then Bottom rounded), numbered 0.
  • the access slot information may be specifically as shown in Table 5.
  • Scenario 5 Assume that the number of PRACH preamble repetitions is 4, the length of one PRACH subchannel is 4 times the length of one AS, and the number of RACH subchannels is 3 (where 3 is equal to 12 divided by 4 and then rounded down), number 0 -2, other conditions are the same as those corresponding to Table 5.
  • the access slot information may be specifically as shown in Table 6.
  • Scenario 6 Assume that the number of PRACH preamble repetitions is 2; the length of one PRACH subchannel is twice the length of one AS; the number of RACH subchannels is 6 (where 6 is equal to 12 divided by 2 and then rounded down), numbered 0, 1, 2, 3, 4, 5; other conditions are the same as those corresponding to Table 5.
  • the access slot information may be specifically as shown in Table 7.
  • the number of PRACH preamble repetitions in this embodiment may be sent by the controller to the UE.
  • This embodiment is an example for the controller to determine access slot information according to multiple PRACH preamble repetition times.
  • Scenario 7 Assume that the number of RACH subchannels is 12, numbered 0-11, AS number is 0-14, and PRACH preamble repetition times are 1, 4, and 8. Then, the access slot information may be specifically as shown in Table 8.
  • the SFN may be used to indicate the number of the PRACH preamble repetitions corresponding to the starting AS.
  • FIG. 8 is a diagram showing the correspondence between the RACH subchannel and the starting AS according to the present invention.
  • FIG. 8 is similar to that of Table 8, and is not described here.
  • the starting AS may be used to indicate the number of the PRACH preamble repetitions corresponding to the starting AS.
  • Scenario 8 The number of RACH subchannels is 12, numbered 0-11; the number of the AS is 0-14, and the number of PRACH repetitions corresponding to the starting AS numbered 0-2 is 1, and the number is 3-6.
  • the number of PRACH repetitions corresponding to the starting AS is 4, and the number of PRACH repetitions corresponding to the starting AS numbered 7-14 is 8.
  • the access slot information may be specifically as shown in Table 9.
  • FIG. 9 is a schematic diagram of the correspondence between the RACH subchannel and the starting AS according to the present invention. The meanings shown in FIG. 9 are similar to those in Table 9, and are not described herein again.
  • step 402 may specifically be:
  • the UE determines that the number of repetitions of the PRACH preamble is N; wherein, N is a positive integer greater than or equal to 1; the UE determines, according to the access slot information, that the number of PRACH preamble repetitions corresponding to the first starting AS is N; The N ASs that the UE starts at the first start AS repeatedly send N the PRACH preambles to the base station.
  • FIG. 10 is a schematic structural diagram of Embodiment 1 of the controller of the present invention; as shown in FIG. 10, the controller of this embodiment may include: a processing module 1001 and a sending module 1002.
  • the processing module 1001 is configured to determine access slot information according to the at least one PRACH preamble repetition number, where the access slot information includes a start access slot AS corresponding to each random access channel RACH subchannel.
  • the number of the PRACH preamble repetitions starting from the AS is used by the same user equipment to send the same PRACH preamble;
  • the sending module 1002 is configured to send the access slot information to each UE, so that the UEs are The PRACH preamble is repeatedly transmitted to the base station according to the access slot information.
  • the number of the RACH subchannels is at least one.
  • the starting AS indicates the number of the PRACH preamble repetitions corresponding to the starting AS.
  • the starting AS corresponding to the RACH subchannel of each random access channel may be: a starting AS corresponding to each RACH subchannel in a different system frame number SFN.
  • the SFN indicates the number of PRACH preamble repetitions corresponding to the starting AS.
  • the controller of this embodiment may be used to implement the technical solution of the first embodiment of the method for transmitting the PRACH preamble, and the third embodiment of the method for transmitting the preamble of the PRACH preamble, and the technical solution of the controller side of the fourth embodiment, the implementation principle and the technical effect are similar. , will not repeat them here.
  • FIG. 11 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention; as shown in FIG. 11, the user equipment in this embodiment may include: a receiving module 1101 and a sending module 1102.
  • the receiving module 1101 is configured to receive access slot information sent by the controller, where the access slot information includes a starting access slot AS corresponding to each random access channel RACH subchannel, and the starting AS
  • the first PRACH preamble repetition number AS is used by the same UE to send the same PRACH preamble
  • the sending module 1102 is configured to repeatedly send the PRACH preamble to the base station according to the access slot information.
  • the number of the RACH subchannels is at least one.
  • the starting AS indicates that the PRACH preamble corresponding to the starting AS is repeated number.
  • the starting AS corresponding to the RACH subchannel of each random access channel may be: a starting AS corresponding to each RACH subchannel in a different system frame number SFN.
  • the SFN indicates the number of PRACH preamble repetitions corresponding to the starting AS.
  • the sending module 1102 is specifically configured to:
  • N is a positive integer greater than or equal to 1;
  • the N ASs starting at the first start AS repeatedly send N the PRACH preambles to the base station.
  • the user equipment in this embodiment may be used to implement the technical solution of the second embodiment of the method for transmitting the PRACH preamble, and the third embodiment of the method for transmitting the PRACH preamble, and the technical solution of the UE side is similar. I will not repeat them here.
  • the present invention further provides a transmission system for a PRACH preamble, comprising: the controller according to the first embodiment of the controller, and the UE according to the first embodiment of the user equipment.
  • the system of the present embodiment can be used to implement the technical solution of the third embodiment and the fourth embodiment of the method for transmitting the PRACH preamble.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of Embodiment 2 of the controller of the present invention; as shown in FIG. 12, the controller of this embodiment may include: a processor 1201 and a transmitter 1202.
  • the processor 1201 is configured to determine access slot information according to the at least one PRACH preamble repetition number, where the access slot information includes a start access slot AS corresponding to each random access channel RACH subchannel.
  • the number of the PRACH preamble repetitions starting from the AS is used by the same user equipment to send the same PRACH preamble;
  • the transmitter 1202 is configured to send the access slot information to each UE, so that the UEs are The PRACH preamble is repeatedly transmitted to the base station according to the access slot information.
  • the number of the RACH subchannels is at least one.
  • the starting AS indicates the number of the PRACH preamble repetitions corresponding to the starting AS.
  • the starting AS corresponding to the RACH subchannel of each random access channel may be: a starting AS corresponding to each RACH subchannel in a different system frame number SFN.
  • the SFN indicates the number of PRACH preamble repetitions corresponding to the starting AS.
  • the controller of this embodiment may be used to implement the technical solution of the first embodiment of the method for transmitting the PRACH preamble, and the third embodiment of the method for transmitting the preamble of the PRACH preamble, and the technical solution of the controller side of the fourth embodiment, the implementation principle and the technical effect are similar. , will not repeat them here.
  • FIG. 13 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention; as shown in FIG. 13, the user equipment in this embodiment may include: a receiver 1301, a processor 1302, and a transmitter 1303.
  • the receiver 1301 is configured to receive access slot information sent by the controller, where the access slot information includes a start access slot AS corresponding to each random access channel RACH subchannel, and the start AS
  • the initial number of PRACH preamble repetitions is used by the same UE to send the same PRACH preamble
  • the processor 1302 is configured to determine, according to the access slot information, that the number of PRACH preamble repetitions starting at the first starting AS is repeatedly sent to the base station.
  • a PRACH preamble a transmitter 1303, configured to repeatedly transmit the PRACH preamble to the base station by a number of preamble repetitions starting at the first start AS.
  • the number of the RACH subchannels is at least one.
  • the starting AS indicates the number of the PRACH preamble repetitions corresponding to the starting AS.
  • the starting AS corresponding to the RACH subchannel of each random access channel may be: a starting AS corresponding to each RACH subchannel in a different system frame number SFN.
  • the SFN indicates the number of PRACH preamble repetitions corresponding to the starting AS.
  • processor 1302 is specifically configured to:
  • N is a positive integer greater than or equal to 1;
  • the user equipment in this embodiment may be used to implement the technical solution of the second embodiment of the method for transmitting the PRACH preamble, and the third embodiment of the method for transmitting the PRACH preamble, and the technical solution of the UE side is similar. I will not repeat them here.
  • the steps can be completed by the relevant hardware of the program instructions.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Abstract

本发明实施例提供一种PRACH前导的发送方法、设备及系统；通过控制器根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各RACH子信道对应的起始AS；所述起始AS开始的所述PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；所述控制器将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导；使得起始AS开始的PRACH前导重复次数个AS都用于同一UE向基站重复发送PRACH前导；解决了由于PRACH前导的重复发送，而导致碰撞机会增加的问题；从而减小了接入失败的概率。

Description

PRACH前导的发送方法、设备及系统 技术领域
本发明实施例涉及通信技术，尤其涉及一种物理随机接入信道(PRACH，Physical Random Access Channel)前导的发送方法、设备及系统。
背景技术
用户设备(UE，User Equipment)在与基站进行数据传输之前，需要发起随机接入过程。
现有技术中，UE在随机接入过程中需要从该UE可用的随机接入信道(RACH，Random Access Channel)子信道中随机选择一个接入时隙(AS，Access slot)，并通过该AS来向基站发送PRACH前导(preamble)。如果多个UE使用相同的签名(signature)序列在相同的AS上向基站发送PRACH前导，则基站无法对不同UE发送的PRACH前导进行区分，导致使用相同签名序列的UE接入失败。通常，为了提高PRACH前导的覆盖能力，UE将同一PRACH前导在多个AS中进行发送，使得基站可以对这些多次重复的信息进行合并处理，通过合并增益达到提升覆盖的效果。然而，现有技术中UE在进行PRACH前导重复发送时，会导致多个UE使用相同的签名序列在相同的AS上向基站发送PRACH前导概率的增加。
因此，现有技术中存在当UE进行PRACH前导重复发送时，接入失败概率较大的问题。
发明内容
本发明实施例提供一种PRACH前导的发送方法、设备及系统。
第一方面，本发明实施例提供一种物理随机接入信道PRACH前导的发送方法，包括：
控制器根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE 发送同一PRACH前导；
所述控制器将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
结合第一方面，在第一方面的第一种可能实现的方式中，所述RACH子信道的个数为至少一个。
结合第一方面或第一方面的第一种可能实现的方式，在第一方面的第二种可能实现的方式中，所述各随机接入信道RACH子信道对应的起始AS，具体为：
不同系统帧号SFN下，各RACH子信道对应的起始AS。
结合第一方面的第二种可能实现的方式，在第一方面的第三种可能实现的方式中，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
结合第一方面或第一方面的第一种至第二种任一种可能实现的方式，在第一方面的第四种可能实现的方式中，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
第二方面，本发明实施例提供一种物理随机接入信道PRACH前导的发送方法，包括：
用户设备UE接收控制器发送的接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
所述UE根据所述接入时隙信息，向基站重复发送PRACH前导。
结合第二方面，在第二方面的第一种可能实现的方式中，所述RACH子信道的个数为至少一个。
结合第二方面或第二方面的第一种可能实现的方式，在第二方面的第二种可能实现的方式中，所述各随机接入信道RACH子信道对应的起始AS，具体为：
不同系统帧号SFN下，各RACH子信道对应的起始AS。
结合第二方面的第二种可能实现的方式，在第二方面的第三种可能实现的方式中，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
结合第二方面或第二方面的第一种至第二种任一种可能实现的方式，在第二方面的第四种可能实现的方式中，所述起始AS指示所述起始AS对应的 所述PRACH前导重复次数。
结合第二方面或第二方面的第一种至第四种任一种可能实现的方式，在第二方面的第五种可能实现的方式中，所述UE根据所述接入时隙信息，向所述基站重复发送PRACH前导，包括：
所述UE确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；
所述UE根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；
所述UE在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
第三方面，本发明实施例提供一种控制器，所述控制器包括：
处理模块，用于根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE发送同一PRACH前导；
发送模块，用于将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
结合第三方面，在第三方面的第一种可能实现的方式中，所述RACH子信道的个数为至少一个。
结合第三方面或第三方面的第一种可能实现的方式，在第三方面的第二种可能实现的方式中，所述各随机接入信道RACH子信道对应的起始AS，具体为：
不同系统帧号SFN下，各RACH子信道对应的起始AS。
结合第三方面的第二种可能实现的方式，在第三方面的第三种可能实现的方式中，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
结合第三方面或第三方面的第一种至第二种任一种可能实现的方式，在第三方面的第四种可能实现的方式中，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
第四方面，本发明实施例提供一种用户设备UE，所述用户设备包括：
接收模块，用于接收控制器发送的接入时隙信息；所述接入时隙信息包 括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
发送模块，用于根据所述接入时隙信息，向基站重复发送PRACH前导。
结合第四方面，在第四方面的第一种可能实现的方式中，所述RACH子信道的个数为至少一个。
结合第四方面或第四方面的第一种可能实现的方式，在第四方面的第二种可能实现的方式中，所述各随机接入信道RACH子信道对应的起始AS，具体为：
不同系统帧号SFN下，各RACH子信道对应的起始AS。
结合第四方面的第二种可能实现的方式，在第四方面的第三种可能实现的方式中，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
结合第四方面或第四方面的第一种至第二种任一种可能实现的方式，在第四方面的第四种可能实现的方式中，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
结合第四方面或第四方面的第一种至第四种任一种可能实现的方式，在第四方面的第五种可能实现的方式中，所述发送模块，具体用于：
确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；
根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；
在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
第五方面，本发明实施例提供一种物理随机接入信道PRACH前导的发送系统，包括：第三方面或第三方面的第一种至第四种任一种所述的控制器，以及第四方面或第四方面的第一种至第五种任一种所述的用户设备UE。
第六方面，本发明实施例提供一种控制器，所述控制器包括：
处理器，用于根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE发送同一PRACH前导；
发送器，用于将所述接入时隙信息发送至各UE，以使所述各UE根据所 述接入时隙信息向基站重复发送PRACH前导。
结合第六方面，在第六方面的第一种可能实现的方式中，所述RACH子信道的个数为至少一个。
结合第六方面或第六方面的第一种可能实现的方式，在第六方面的第二种可能实现的方式中，所述各随机接入信道RACH子信道对应的起始AS，具体为：
不同系统帧号SFN下，各RACH子信道对应的起始AS。
结合第六方面的第二种可能实现的方式，在第六方面的第三种可能实现的方式中，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
结合第六方面或第六方面的第一种至第二种任一种可能实现的方式，在第六方面的第四种可能实现的方式中，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
第七方面，本发明实施例提供一种用户设备UE，所述用户设备包括：
接收器，用于接收控制器发送的接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
处理器，用于根据所述接入时隙信息，确定在第一起始AS开始的PRACH前导重复次数个AS向基站重复发送PRACH前导；
发送器，用于在所述第一起始AS开始的前导重复次数个AS向所述基站重复发送所述PRACH前导。
结合第七方面，在第七方面的第一种可能实现的方式中，所述RACH子信道的个数为至少一个。
结合第七方面或第七方面的第一种可能实现的方式，在第七方面的第二种可能实现的方式中，所述各随机接入信道RACH子信道对应的起始AS，具体为：
不同系统帧号SFN下，各RACH子信道对应的起始AS。
结合第七方面的第二种可能实现的方式，在第七方面的第三种可能实现的方式中，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
结合第七方面或第七方面的第一种至第二种任一种可能实现的方式，在第七方面的第四种可能实现的方式中，所述起始AS指示所述起始AS对应的 所述PRACH前导重复次数。
结合第七方面或第七方面的第一种至第四种任一种可能实现的方式，在第七方面的第五种可能实现的方式中，所述处理器，具体用于确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；
所述发送器，具体用于在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
本发明提供一种PRACH前导的发送方法、设备及系统；通过控制器根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各RACH子信道对应的起始AS；所述起始AS开始的所述PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；所述控制器将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导；使得起始AS开始的PRACH前导重复次数个AS都用于同一UE向基站重复发送PRACH前导；解决了由于PRACH前导的重复发送，而导致碰撞机会增加的问题；从而减小了接入失败的概率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术RACH子信道与AS的对应关系图；
图2为现有技术PRACH前导重复发送导致UE接入失败的示意图；
图3为本发明PRACH前导的发送方法实施例一的流程图；
图4为本发明PRACH前导的发送方法实施例二的流程图；
图5为本发明RACH子信道与起始AS的对应关系图一；
图6为本发明RACH子信道与起始AS的对应关系图二；
图7为本发明RACH子信道与起始AS的对应关系图三；
图8为本发明RACH子信道与起始AS的对应关系图四；
图9为本发明RACH子信道与起始AS的对应关系图五；
图10为本发明控制器实施例一的结构示意图；
图11为本发明用户设备实施例一的结构示意图；
图12为本发明控制器实施例二的结构示意图；
图13为本发明用户设备实施例二的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
UE在随机接入过程中需要从该UE可用的RACH子信道中随机选择一个AS；现有技术中，RACH子信道与AS的对应关系表1所示；需要说明的是，表1中与“RACH子信道号”紧邻的一行中的0-11分别表示12个RACH子信道，与“SFN％8”处于同一列的0-7分别表示系统帧号(SFN，System FrameNumber)模8之后的8个余数，其他数字0-14用于表示AS的编号。
表1
Figure PCTCN2015088393-appb-000001
图1为现有技术RACH子信道与AS的对应关系图，图1所表示的含义与表1类似，在此不再赘述。
图2为现有技术PRACH前导重复发送导致UE接入失败的示意图；假设现有技术中有2个UE(例如，UE1和UE2)，需要发起随机接入；UE1在SFN0中选择第0个AS(也即，AS0)发送PRACH前导1(图2中前导1通过斜条纹填充的区域表示)，并在第1个AS(也即，AS1)重复发送PRACH前导1；UE2在SFN0中选择第1个AS同样发送PRACH前导1；如图2所示，UE1和UE2在第1个AS的位置会发生碰撞，基站无法对UE1和UE2发送的PRACH前导进行区分，导致UE1和UE2接入失败。
可以看出，由于PRACH前导的重复发送，会导致碰撞机会的增加；从而导致接入失败概率的增加；因此，现有技术中存在接入失败概率较大的问题。
需要说明的是，图2所示的PRACH前导重复发送的方法为UE在连续多个AS的起始位置分别发送同一PRACH前导(例如，若PRACH前导重复次数为4，则需要在连续的4个AS的开始位置发送同一PRACH前导)。本发明的方法还可以应用于UE在一个AS的起始位置开始，连续多次发送同一PRACH前导(例如，若PRACH前导重复次数为4，则需要在某一AS的开始位置将同一PRACH前导连续发送4次)。
图3为本发明PRACH前导的发送方法实施例一的流程图；如图3所示，本实施例的方法可以包括：
步骤301、控制器根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各RACH子信道对应的起始AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
需要说明的是，起始AS之后的N-1(N为重复次数)个AS均为不可用起始AS，即UE不能在这N-1个AS内发起接入。
可选的，所述控制器可以为无线网络控制器RNC(radio network controller)。
需要说明的是，PRACH前导占用4096(其中，4096＝16*256)chip；每个AS包含5120码片；因此，PRACH前导重复次数与AS个数相等(例如，UE需要将PRACH前导A重复发送8次时，则需要占用8个AS)。
步骤302、所述控制器将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
本实施例中，通过控制器根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各RACH子信道对应的起始AS；所述起始AS开始的所述PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；所述控制器将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导；使得起始AS开始的PRACH前导重复次数个AS都用于同一UE向基站重复发送PRACH前导；解决了由于PRACH前导的重复发送，而导致碰撞机会增加的问题；从而减小了接入失败的概率。
图4为本发明PRACH前导的发送方法实施例二的流程图；如图4所示，本实施例的方法可以包括：
步骤401、UE接收控制器发送的接入时隙信息；所述接入时隙信息包括各RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
步骤402、所述UE根据所述接入时隙信息，向基站重复发送PRACH前导。
本实施例中，通过UE接收控制器发送的接入时隙信息；所述接入时隙信息包括各RACH子信道号对应的起始接入时隙AS；所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；所述UE根据所述接入时隙信息，向基站重复发送PRACH前导；使得起始AS开始的PRACH前导重复次数个AS都用于该UE向基站重复发送PRACH前导；解决了由于PRACH前导的重复发送，而导致碰撞机会增加的问题；从而减小了接入失败的概率。
PRACH前导的发送方法实施例三
本实施例为控制器根据一个PRACH前导重复次数，确定接入时隙信息的举例说明。
场景1：假设AS的编号分别为0-14；PRACH前导重复次数为8；RACH子信道的个数为12，编号分别为0-11。则接入时隙信息具体可以如表2所示。表2中与“RACH子信道号”紧邻的一行中的0-11分别表示12个RACH子信道，与“SFN％16”处于同一列的0-15分别表示SFN模16之后的16个余数，其他数字0-14用于表示起始AS的编号。
表2
Figure PCTCN2015088393-appb-000002
如表2所示，当SFN％16等于0时，0号RACH子信道对应的起始AS为0号AS；则表示从SFN％16等于0的无线帧的第0个AS开始的8个AS用于同一UE发送同一PRACH前导。
需要说明的是，表2中的空格表示不可用起始AS；例如，第0个AS之后的7个AS为不可用起始AS。
图5为本发明RACH子信道与起始AS的对应关系图一，图5所表示的含义与表2类似，在此不再赘述。
需要说明的是，SFN的周期可以通过RACH子信道数、AS数以及PRACH重复次数三者的最小公倍数，乘以2，再除以AS个数的方式确定。例如，对于RACH子信道数等于12、AS数等于15、PRACH重复次数等于8时，其 三者的最小公倍数为120，120乘以2再除以15等于16。
场景2：假设PRACH前导重复次数为4，其他条件与表2对应的条件相同；则，接入时隙信息具体可以如表3所示。
表3
Figure PCTCN2015088393-appb-000003
图6为本发明RACH子信道与起始AS的对应关系图二，图6所表示的含义与表3类似，在此不再赘述。
如表3所示，当SFN％8等于0时，0号RACH子信道对应的起始AS为0号AS；则表示从SFN％8等于0的无线帧的第0个AS开始的4个AS用于同一UE发送同一PRACH前导。
需要说明的是，表3中的空格表示不可用起始AS；例如，第0个AS之后的3个AS为不可用起始AS。
场景3：假设PRACH前导重复次数为2，其他条件与表2对应的条件相同；则，接入时隙信息具体可以如表4所示。
表4
Figure PCTCN2015088393-appb-000004
Figure PCTCN2015088393-appb-000005
图7为本发明RACH子信道与起始AS的对应关系图三，图7所表示的含义与表4类似，在此不再赘述。
如表4所示，当SFN％7等于0时，0号RACH子信道对应的起始AS为0号AS；则表示从SFN％7等于0的无线帧的第0个AS开始的2个AS用于同一UE发送同一PRACH前导。
需要说明的是，表4中的空格表示不可用起始AS；例如，第0个AS之后的1个AS为不可用起始AS。
需要说明的是，表2-表4中一个RACH子信道的长度与一个AS的长度相同(例如，都为5120chip)。可选的，一个RACH子信道号的长度也可以为一个AS长度的整数倍；具体如下表5-表7所示。
场景4：假设AS的编号为0-14；PRACH前导重复次数为8；一个PRACH子信道的长度为一个AS长度的8倍；RACH子信道的个数1(其中1等于12除以8再向下取整)，编号为0。则接入时隙信息具体可以如表5所示。
表5
Figure PCTCN2015088393-appb-000006
Figure PCTCN2015088393-appb-000007
由表5可以看出，RACH子信道的个数可以为一个。
场景5：假设PRACH前导重复次数为4，一个PRACH子信道的长度为一个AS长度的4倍；RACH子信道的个数3(其中，3等于12除以4再向下取整)，编号0-2，其他条件与表5对应的条件相同。则接入时隙信息具体可以如表6所示。
表6
Figure PCTCN2015088393-appb-000008
由表6可以看出，RACH子信道的个数可以为多个。
场景6：假设PRACH前导重复次数为2；一个PRACH子信道的长度为一个AS长度的2倍；RACH子信道的个数6(其中，6等于12除以2再向下取整)，编号为0、1、2、3、4、5；其他条件与表5对应的条件相同。则接入时隙信息具体可以如表7所示。
表7
Figure PCTCN2015088393-appb-000009
Figure PCTCN2015088393-appb-000010
需要说明的是，本实施例中所述PRACH前导重复次数可以由所述控制器发送至UE。
PRACH前导的发送方法实施例四
本实施例为控制器根据多个PRACH前导重复次数，确定接入时隙信息的举例说明。
场景7：假设RACH子信道的个数为12，编号为0-11；AS的编号为0-14；PRACH前导重复次数为1、4、8。则，接入时隙信息具体可以如表8所示。
表8
Figure PCTCN2015088393-appb-000011
Figure PCTCN2015088393-appb-000012
可选的，SFN可以用于指示起始AS对应的所述PRACH前导重复次数。
例如，表8中SFN％3＝0时，起始AS对应的PRACH前导重复次数为1；SFN％3＝1时，起始AS对应的PRACH前导重复次数为4，其后的3个AS为不可用起始AS；SFN％3＝2，起始AS对应的PRACH前导重复次数为8，其后的7个AS为不可用起始AS。
图8为本发明RACH子信道与起始AS的对应关系图四，图8所表示的含义与表8类似，在此不再赘述。
可选的，本发明中起始AS可以用于指示起始AS对应的所述PRACH前导重复次数。
场景8：假设RACH子信道的个数为12，编号为0-11；AS的编号为0-14，且编号为0-2的起始AS对应的PRACH重复次数为1，编号为3-6的起始AS对应的PRACH重复次数为4，编号为7-14的起始AS对应的PRACH重复次数为8。则，接入时隙信息具体可以如表9所示。
表9
Figure PCTCN2015088393-appb-000013
图9为本发明RACH子信道与起始AS的对应关系图五，图9所表示的含义与表9类似，在此不再赘述。
可选的，对于不同的上述场景，步骤402具体可以为：
所述UE确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；所述UE根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；所述UE在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
图10为本发明控制器实施例一的结构示意图；如图10所示，本实施例的控制器可以包括：处理模块1001和发送模块1002。其中，处理模块1001，用于根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE发送同一PRACH前导；发送模块1002，用于将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
可选的，所述RACH子信道的个数为至少一个。
可选的，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
可选的，所述各随机接入信道RACH子信道对应的起始AS，具体可以为：不同系统帧号SFN下，各RACH子信道对应的起始AS。
进一步可选的，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
本实施例的控制器，可以用于执行PRACH前导的发送方法实施例一的技术方案，及PRACH前导的发送方法实施例三、实施例四控制器侧的技术方案，其实现原理和技术效果类似，此处不再赘述。
图11为本发明用户设备实施例一的结构示意图；如图11所示，本实施例的用户设备可以包括：接收模块1101和发送模块1102。其中，接收模块1101，用于接收控制器发送的接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；发送模块1102，用于根据所述接入时隙信息，向基站重复发送PRACH前导。
可选的，所述RACH子信道的个数为至少一个。
可选的，所述起始AS指示所述起始AS对应的所述PRACH前导重复次 数。
可选的，所述各随机接入信道RACH子信道对应的起始AS，具体可以为：不同系统帧号SFN下，各RACH子信道对应的起始AS。
进一步可选的，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
可选的，发送模块1102，具体用于：
确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；
根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；
在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
本实施例的用户设备，可以用于执行PRACH前导的发送方法实施例二的技术方案，及PRACH前导的发送方法实施例三、实施例四UE侧的技术方案，其实现原理和技术效果类似，此处不再赘述。
本发明还提供一种PRACH前导的发送系统，包括：控制器实施例一所述的控制器，以及用户设备实施例一所述的UE。
本实施例的系统，可以用于执行PRACH前导的发送方法实施例三、实施例四的技术方案，其实现原理和技术效果类似，此处不再赘述。
图12为本发明控制器实施例二的结构示意图；如图12所示，本实施例的控制器可以包括：处理器1201和发送器1202。其中，处理器1201，用于根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE发送同一PRACH前导；发送器1202，用于将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
可选的，所述RACH子信道的个数为至少一个。
可选的，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
可选的，所述各随机接入信道RACH子信道对应的起始AS，具体可以为：不同系统帧号SFN下，各RACH子信道对应的起始AS。
进一步可选的，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
本实施例的控制器，可以用于执行PRACH前导的发送方法实施例一的技术方案，及PRACH前导的发送方法实施例三、实施例四控制器侧的技术方案，其实现原理和技术效果类似，此处不再赘述。
图13为本发明用户设备实施例二的结构示意图；如图13所示，本实施例的用户设备可以包括：接收器1301、处理器1302和发送器1303。其中，接收器1301，用于接收控制器发送的接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；处理器1302，用于根据所述接入时隙信息，确定在第一起始AS开始的PRACH前导重复次数个AS向基站重复发送PRACH前导；发送器1303，用于在所述第一起始AS开始的前导重复次数个AS向所述基站重复发送所述PRACH前导。
可选的，所述RACH子信道的个数为至少一个。
可选的，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
可选的，所述各随机接入信道RACH子信道对应的起始AS，具体可以为：不同系统帧号SFN下，各RACH子信道对应的起始AS。
进一步可选的，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
可选的，处理器1302，具体用于：
确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；
根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N。
相应的，发送器1303，具体用于在所述第一起始AS开始的N个AS通过发送器1303向所述基站重复发送N个所述PRACH前导。
本实施例的用户设备，可以用于执行PRACH前导的发送方法实施例二的技术方案，及PRACH前导的发送方法实施例三、实施例四UE侧的技术方案，其实现原理和技术效果类似，此处不再赘述。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (34)

  1. 一种物理随机接入信道PRACH前导的发送方法，其特征在于，包括：
    控制器根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE发送同一PRACH前导；
    所述控制器将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
  2. 根据权利要求1所述的方法，其特征在于，所述RACH子信道的个数为至少一个。
  3. 根据权利要求1或2所述的方法，其特征在于，所述各随机接入信道RACH子信道对应的起始AS，具体为：
    不同系统帧号SFN下，各RACH子信道对应的起始AS。
  4. 根据权利要求3所述的方法，其特征在于，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
  5. 根据权利要求1-3任一项所述的方法，其特征在于，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
  6. 一种物理随机接入信道PRACH前导的发送方法，其特征在于，包括：
    用户设备UE接收控制器发送的接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
    所述UE根据所述接入时隙信息，向基站重复发送PRACH前导。
  7. 根据权利要求6所述的方法，其特征在于，所述RACH子信道的个数为至少一个。
  8. 根据权利要求6或7所述的方法，其特征在于，所述各随机接入信道RACH子信道对应的起始AS，具体为：
    不同系统帧号SFN下，各RACH子信道对应的起始AS。
  9. 根据权利要求8所述的方法，其特征在于，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
  10. 根据权利要求6-8任一项所述的方法，其特征在于，所述起始AS指 示所述起始AS对应的所述PRACH前导重复次数。
  11. 根据权利要求6-10任一项所述的方法，其特征在于，所述UE根据所述接入时隙信息，向所述基站重复发送PRACH前导，包括：
    所述UE确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；
    所述UE根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；
    所述UE在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
  12. 一种控制器，其特征在于，所述控制器包括：
    处理模块，用于根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE发送同一PRACH前导；
    发送模块，用于将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
  13. 根据权利要求12所述的控制器，其特征在于，所述RACH子信道的个数为至少一个。
  14. 根据权利要求12或13所述的控制器，其特征在于，所述各随机接入信道RACH子信道对应的起始AS，具体为：
    不同系统帧号SFN下，各RACH子信道对应的起始AS。
  15. 根据权利要求14所述的控制器，其特征在于，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
  16. 根据权利要求12-14任一项所述的控制器，其特征在于，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
  17. 一种用户设备UE，其特征在于，所述UE包括：
    接收模块，用于接收控制器发送的接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
    发送模块，用于根据所述接入时隙信息，向基站重复发送PRACH前导。
  18. 根据权利要求17所述的UE，其特征在于，所述RACH子信道的个数为至少一个。
  19. 根据权利要求17或18所述的UE，其特征在于，所述各随机接入信道RACH子信道对应的起始AS，具体为：
    不同系统帧号SFN下，各RACH子信道对应的起始AS。
  20. 根据权利要求19所述的UE，其特征在于，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
  21. 根据权利要求17-19任一项所述的UE，其特征在于，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
  22. 根据权利要求17-21任一项所述的UE，其特征在于，所述发送模块，具体用于：
    确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；
    根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；
    在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
  23. 一种物理随机接入信道PRACH前导的发送系统，其特征在于，包括：权利要求12-16任一项所述的控制器，以及权利要求17-22任一项所述的用户设备UE。
  24. 一种控制器，其特征在于，所述控制器包括：
    处理器，用于根据至少一个PRACH前导重复次数，确定接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的所述PRACH前导重复次数个AS用于同一用户设备UE发送同一PRACH前导；
    发送器，用于将所述接入时隙信息发送至各UE，以使所述各UE根据所述接入时隙信息向基站重复发送PRACH前导。
  25. 根据权利要求24所述的控制器，其特征在于，所述RACH子信道的个数为至少一个。
  26. 根据权利要求24或25所述的控制器，其特征在于，所述各随机接入信道RACH子信道对应的起始AS，具体为：
    不同系统帧号SFN下，各RACH子信道对应的起始AS。
  27. 根据权利要求26所述的控制器，其特征在于，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
  28. 根据权利要求24-26任一项所述的控制器，其特征在于，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
  29. 一种用户设备UE，其特征在于，所述UE包括：
    接收器，用于接收控制器发送的接入时隙信息；所述接入时隙信息包括各随机接入信道RACH子信道对应的起始接入时隙AS，所述起始AS开始的PRACH前导重复次数个AS用于同一UE发送同一PRACH前导；
    处理器，用于根据所述接入时隙信息，确定在第一起始AS开始的PRACH前导重复次数个AS向基站重复发送PRACH前导；
    发送器，用于在所述第一起始AS开始的前导重复次数个AS向所述基站重复发送所述PRACH前导。
  30. 根据权利要求29所述的UE，其特征在于，所述RACH子信道的个数为至少一个。
  31. 根据权利要求29或30所述的UE，其特征在于，所述各随机接入信道RACH子信道对应的起始AS，具体为：
    不同系统帧号SFN下，各RACH子信道对应的起始AS。
  32. 根据权利要求31所述的UE，其特征在于，所述SFN指示所述起始AS对应的所述PRACH前导重复次数。
  33. 根据权利要求29-31任一项所述的UE，其特征在于，所述起始AS指示所述起始AS对应的所述PRACH前导重复次数。
  34. 根据权利要求29-33任一项所述的UE，其特征在于，所述处理器，具体用于确定PRACH前导的重复次数为N；其中，N为大于等于1的正整数；根据所述接入时隙信息，确定第一起始AS对应的PRACH前导重复次数为N；
    所述发送器，具体用于在所述第一起始AS开始的N个AS向所述基站重复发送N个所述PRACH前导。
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