WO2019213972A1 - Appareil et procédé de transmission d'un préambule d'accès aléatoire - Google Patents

Appareil et procédé de transmission d'un préambule d'accès aléatoire Download PDF

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Publication number
WO2019213972A1
WO2019213972A1 PCT/CN2018/086613 CN2018086613W WO2019213972A1 WO 2019213972 A1 WO2019213972 A1 WO 2019213972A1 CN 2018086613 W CN2018086613 W CN 2018086613W WO 2019213972 A1 WO2019213972 A1 WO 2019213972A1
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Prior art keywords
scrambling code
code sequence
random access
access preamble
symbol group
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PCT/CN2018/086613
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English (en)
Chinese (zh)
Inventor
苏俞婉
罗之虎
金哲
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华为技术有限公司
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Priority to CN201880092067.9A priority Critical patent/CN111937477B/zh
Priority to PCT/CN2018/086613 priority patent/WO2019213972A1/fr
Publication of WO2019213972A1 publication Critical patent/WO2019213972A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a random access preamble.
  • the narrowband internet of things (NB-IoT) system is an Internet of Things proposed for IoT applications that needs to meet the special requirements of coverage enhancement, support for a large number of low-rate devices, low cost, and low energy consumption.
  • a narrowband physical random access channel (NPRACH) is an uplink random access channel of the NB-IoT system.
  • the uplink of the NB-IoT system adopts single-carrier frequency-division multiple access (SC-FDMA) technology, in order to ensure that uplink data of different terminal devices can reach the base station side at the same time to avoid mutual Interference, the terminal device needs to perform a random access procedure before sending uplink data.
  • SC-FDMA single-carrier frequency-division multiple access
  • the random access signal transmitted by the terminal device on the random access channel is an NB-IoT random access preamble composed of a symbol group of a single subcarrier frequency hopping.
  • one preamble is composed of 4 symbol groups, and each symbol in each symbol group carries a sequence of 1. Since the sequence of each symbol in each symbol group on the random access preamble of NPRACH is 1, it is the same for all cells in the NB-IoT system, and the cell cannot be distinguished.
  • the target cell may generate a false alarm problem due to the NPRACH interference sent by the terminal device that receives the interfering cell, that is, it may appear in the jurisdiction of the target cell, and there is no terminal.
  • the device sends the NPRACH signal, but the target cell can detect the NPRACH signal.
  • the target cell and the interfering cell may collide with multiple repetition periods, resulting in a collision. The probability of false alarm in the target cell increases.
  • the embodiment of the present application provides a method and a device for transmitting a random access preamble, which are used to solve the problem of false alarms.
  • the present application provides a method for transmitting a random access preamble, including: determining, by a terminal device, a scrambling code sequence according to a cell identifier and a first parameter; and using, by the terminal device, random access according to the scrambling code sequence
  • the preamble is scrambled; the terminal device sends the scrambled random access preamble.
  • the scrambling code sequence is determined by using the cell identifier and the first parameter, and the random access preamble is scrambled to ensure that when the random access resources configured by different cells are the same, the terminal devices of different cells are the same.
  • the random access preamble sent by the subcarrier position is different, so that the problem of false alarm can be solved.
  • the scrambling code sequence is used to scramble the random access preamble, which also ensures that the random access preambles sent by different terminal devices at different subcarrier positions are different in one serving cell, thereby ensuring the serving cell.
  • TA estimate is used to scramble the random access preamble.
  • the first parameter includes one or more of the following: a subcarrier index of the first symbol group of the random access preamble, and multiple of the random access preambles. a subcarrier index of the symbol group, a length of the scrambling code sequence, a carrier index of the random access preamble, a first subcarrier index of a frequency domain resource of the random access preamble, the random access preamble The start time of the code.
  • the terminal device when the first parameter includes a subcarrier index of the first symbol group of the random access preamble and the scrambling code sequence length, the terminal device according to the cell identifier and Determining the scrambling code sequence, the first parameter determining, by the terminal device, the scrambling code sequence index according to the cell identifier, the subcarrier index of the first symbol group of the random access preamble, and the length of the scrambling code sequence; The terminal device determines the scrambling code sequence according to the scrambling code sequence index.
  • the scrambling code sequence index can satisfy the following formula:
  • the u represents the scrambling code sequence index, Representing the cell identifier, the a subcarrier index indicating a first symbol group of the random access preamble, where k represents a scrambling code sequence length;
  • the scrambling code sequence can satisfy the following formula:
  • the c(m) represents the scrambling code sequence, and the value of m is 0 to k-1, the u represents the scrambling code sequence index, and the k represents the scrambling code sequence length.
  • the scrambling code sequence length is the same as the number of symbols in one symbol group of the random access preamble
  • the terminal device adds the random access preamble according to the scrambling code sequence.
  • the interference includes: the terminal device multiplies the scrambling code sequence by a symbol alignment on each symbol group of the random access preamble, a scrambling code of a cyclic prefix in each symbol group, and the cyclic prefix
  • the scrambling code of the last symbol in the symbol group is the same.
  • the length of the scrambling code sequence is the same as the number of symbols in a repetition period of the random access preamble
  • the terminal device adds the random access preamble according to the scrambling code sequence.
  • the interference includes: the terminal device multiplies the scrambling code sequence by a symbol alignment in each repetition period of the random access preamble, a scrambling code of a cyclic prefix in each symbol group, and the cyclic prefix
  • the scrambling code of the last symbol in the symbol group is the same.
  • the scrambling code sequence length is the same as the number of symbols in all the repetition periods of the random access preamble
  • the terminal device adds the random access preamble according to the scrambling code sequence.
  • the interference includes: the terminal device multiplies the scrambling code sequence by a symbol alignment in all repetition periods of the random access preamble, and the scrambling code of the cyclic prefix and the cyclic prefix in each symbol group
  • the scrambling code of the last symbol in the symbol group is the same.
  • the length of the scrambling code sequence is the same as the number of symbol groups in a repetition period of the random access preamble, and the terminal device performs the random access preamble according to the scrambling code sequence.
  • the scrambling includes: the terminal device multiplies the scrambling code sequence by a symbol group alignment in each repetition period of the random access preamble, and each symbol in each symbol group and a scrambling code of a cyclic prefix the same.
  • the scrambling code sequence length is the same as the number of symbol groups in all repetition periods of the random access preamble, and the terminal device scrambles the random access preamble according to the scrambling code sequence.
  • the method includes: the terminal device multiplies the scrambling code sequence by a symbol group alignment in all repetition periods of the random access preamble, and the scrambling codes of each symbol and the cyclic prefix in each symbol group are the same.
  • the terminal device when the first parameter includes a subcarrier index of the plurality of symbol groups of the random access preamble and the scrambling code sequence length, the terminal device according to the cell identifier and the Determining, by the terminal device, the scrambling code sequence, comprising: determining, by the terminal device, the scrambling code sequence index of each symbol group according to the cell identifier, the subcarrier index of each symbol group, and the length of the scrambling code sequence; The device determines the scrambling code sequence for each symbol group based on the scrambling sequence index of each symbol group.
  • the scrambling code sequence index satisfies the following formula:
  • Representing a cell identity Representing a subcarrier index of an i th symbol group in the random access preamble, where k represents a length of the scrambling code sequence
  • the scrambling code sequence satisfies the following formula:
  • the c(m) represents a scrambling code sequence, and the value of the m is 0 to k-1, the k represents the length of the scrambling code sequence, and the u represents the scrambling code sequence index.
  • the scrambling code sequence length is the same as the number of symbols in one symbol group of the random access preamble
  • the terminal device adds the random access preamble according to the scrambling code sequence.
  • the interference includes: the terminal device multiplies the symbol on each symbol group of the random access preamble by a corresponding scrambling code sequence, and the scrambling code of the cyclic prefix and the cyclic prefix in each symbol group
  • the scrambling code of the last symbol in the symbol group is the same.
  • the terminal device determines a scrambling code sequence according to the cell identifier and the first parameter, including: the terminal device determining a base sequence according to the cell identifier and the first parameter; Determining, by the terminal device, the scrambling code sequence according to the base sequence and a preset repetition rule
  • the preset repetition rule may include: repeating M times for each element in the base sequence in sequence according to an arrangement order of elements in the base sequence, determining the scrambling code sequence; or, for the base sequence The whole is repeated M times, and the scrambling code sequence is determined, and the M is an integer.
  • the terminal device when the first parameter includes a subcarrier index of the first symbol group of the random access preamble and the scrambling code sequence length, the terminal device according to the cell Determining a base sequence, and determining, by the terminal device, the base sequence according to the cell identifier, a subcarrier index of a first symbol group of the random access preamble, and a length of the scrambling code sequence An index; the terminal device determines the base sequence according to the base sequence index.
  • the base sequence index satisfies the following formula:
  • the p represents the base sequence index, Representing a cell identity, a subcarrier index indicating a first symbol group of the random access preamble, the q indicating a length of the base sequence;
  • the base sequence satisfies the following formula:
  • the s(d) represents the base sequence
  • the value of d is from 0 to q-1
  • the q represents the length of the base sequence
  • the p represents the base sequence index
  • the scrambling code sequence length is the same as the sum of the cyclic prefix and the number of symbols in one symbol group of the random access preamble, and the terminal device is configured according to the scrambling code sequence.
  • the scrambling of the random access preamble includes: the terminal device multiplying the scrambling code sequence by a cyclic prefix and a symbol alignment on each symbol group of the random access preamble.
  • the scrambling code sequence length is the same as the sum of the cyclic prefix and the number of symbols in one repetition period of the random access preamble, and the terminal device according to the scrambling code
  • the sequence, the scrambling the random access preamble includes: the terminal device multiplying the scrambling code sequence by a cyclic prefix and a symbol alignment in each repetition period of the random access preamble.
  • the scrambling code sequence length is the same as the sum of the cyclic prefix and the number of symbols in all repetition periods of the random access preamble, and the terminal device is configured according to the scrambling code.
  • the sequence, scrambling the random access preamble includes: the terminal device multiplying the scrambling code sequence by a cyclic prefix and a symbol alignment in all repetition periods of the random access preamble.
  • the terminal device determines, according to the cell identifier and the first parameter, a scrambling code sequence corresponding to the i-th symbol group
  • the terminal device determines, according to the cell identifier, the subcarrier index of the i-th symbol group, and the length of the scrambling code sequence, a base sequence index of the i-th symbol group;
  • the base sequence index of the i-th symbol group is determined, and the base sequence of the i-th symbol group is determined.
  • the base sequence index satisfies the following formula:
  • the p represents the base sequence index, Representing the cell identity, a subcarrier index indicating an i-th symbol group of the random access preamble, where q represents a base sequence length;
  • the base sequence satisfies the following formula:
  • s(d) represents the base sequence
  • d takes values from 0 to q-1
  • q represents the length of the base sequence
  • p represents a base sequence index
  • the scrambling code sequence length is the same as the sum of the cyclic prefix and the number of symbols in one symbol group of the random access preamble, and the terminal device is configured according to the scrambling code sequence.
  • the scrambling of the random access preamble includes: the terminal device corresponding to the scrambling code sequence of the i th symbol group of the random access preamble and the cyclic prefix and symbol on the i th symbol group Multiply, the i takes values from 1 to Y in order.
  • the present application provides a method for transmitting a random access preamble, including: receiving, by a network device, a scrambled random access preamble; and determining, by the network device, a scrambling code sequence according to the cell identifier and the first parameter; The network device descrambles the scrambled random access preamble according to the scrambling code sequence.
  • the first parameter includes one or more of the following: a subcarrier index of a first symbol group of the random access preamble, and a subcarrier of a plurality of symbol groups of the random access preamble An index, a length of the scrambling code sequence, a carrier index of the random access preamble, a first subcarrier index of a frequency domain resource of the random access preamble, and a start sending time of the random access preamble .
  • the network device when the first parameter includes a subcarrier index of the first symbol group of the random access preamble and the scrambling code sequence length, the network device is configured according to the cell identifier and the first parameter, Determining a scrambling code sequence, comprising: determining, by the network device, a scrambling code sequence index according to a cell identifier, a subcarrier index of a first symbol group of the random access preamble, and a length of the scrambling code sequence; The scrambling code sequence is determined according to the scrambling code sequence index.
  • the scrambling code sequence index satisfies the following formula:
  • the u represents the scrambling code sequence index, Representing the cell identifier, the a subcarrier index indicating a first symbol group of the random access preamble, where k represents a scrambling code sequence length;
  • the scrambling code sequence satisfies the following formula:
  • the c(m) represents the scrambling code sequence, and the value of m is 0 to k-1, the u represents the scrambling code sequence index, and the k represents the scrambling code sequence length.
  • the network device determines according to the cell identifier and the first parameter.
  • the scrambling code sequence includes: determining, by the network device, a scrambling code sequence index of each symbol group according to the cell identifier, a subcarrier index of each symbol group, and a length of the scrambling code sequence; The scrambling sequence index of the symbol group determines the scrambling code sequence for each symbol group.
  • the scrambling code sequence index satisfies the following formula:
  • Representing a cell identity Representing a subcarrier index of an i th symbol group in the random access preamble, where k represents a length of the scrambling code sequence
  • the scrambling code sequence satisfies the following formula:
  • the c(m) represents a scrambling code sequence, and the value of the m is 0 to k-1, the k represents the length of the scrambling code sequence, and the u represents the scrambling code sequence index.
  • the present application provides a transmission apparatus for a random access preamble for a terminal device, including: a unit or means for performing the steps of the above first aspect.
  • the present disclosure provides a transmission apparatus for a random access preamble, which is used in a network device, and includes: a unit or a means for performing the foregoing steps of the second aspect.
  • the present application provides a transmission apparatus for a random access preamble, which is used for a terminal device, including at least one processing element and at least one storage element, wherein the at least one storage element is configured to store a program and data, At least one processing element is for performing the method provided by the first aspect of the present application.
  • the present application provides a transmission apparatus for randomly accessing a preamble, for a network device, including at least one processing element and at least one storage element, wherein the at least one storage element is configured to store a program and data, At least one processing element is for performing the method provided by the second aspect of the present application.
  • the present application provides a transmission apparatus apparatus for randomly accessing a preamble, wherein the terminal apparatus includes at least one processing element (or chip) for performing the method of the above first aspect.
  • the present application provides a transmission apparatus for random access preamble, for a network device, including at least one processing element (or chip) for performing the method of the above second aspect.
  • the application provides a program for performing the method of any of the above aspects when executed by a processor.
  • the application provides a program product, such as a computer readable storage medium, comprising the program of the ninth aspect.
  • the embodiment of the present application provides a communication system, where the transmission device of the third aspect or the fifth aspect, and the transmission device of the fourth aspect and the sixth aspect are included in the communication system.
  • FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a frequency hopping of a random access preamble according to an embodiment of the present disclosure
  • FIG. 3 is a schematic flowchart of a method for transmitting a random access preamble according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of a transmission of a random access preamble according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of another transmission of a random access preamble according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a scrambling of a random access preamble according to an embodiment of the present application.
  • FIG. 7 is another schematic diagram of scrambling of a random access preamble according to an embodiment of the present disclosure.
  • FIG. 8 is still another schematic diagram of scrambling of a random access preamble according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a transmission apparatus for a random access preamble according to an embodiment of the present disclosure.
  • FIG. 10 is another schematic structural diagram of a transmission apparatus for a random access preamble according to an embodiment of the present disclosure.
  • FIG. 1 the embodiment of the present application provides a communication system 100, which may include a network device 101 and a plurality of terminal devices located within the coverage of the network device 101.
  • FIG. 1 exemplarily shows a network device 101 and six terminal devices, which are respectively a terminal device 102, a terminal device 103, a terminal device 104, a terminal device 105, a terminal device 106, and a terminal device 107, and the like. .
  • FIG. 1 exemplarily shows a network device 101 and six terminal devices, which are respectively a terminal device 102, a terminal device 103, a terminal device 104, a terminal device 105, a terminal device 106, and a terminal device 107, and the like.
  • FIG. 1 exemplarily shows a network device 101 and six terminal devices, which are respectively a terminal device 102, a terminal device 103, a terminal device 104, a terminal device 105, a terminal device 106, and a terminal device 107, and the like.
  • the terminal device 102 is a vehicle
  • the terminal device 103 is a smart air conditioner
  • the terminal device 104 is a smart fuel dispenser
  • the terminal device 105 is a mobile phone
  • the terminal device 106 is a smart tea cup
  • the terminal device 107 is The printer is illustrated.
  • the network device 101 can function as a sender and can transmit information to one or more of the terminal devices 102 to 107.
  • the terminal devices 102 to 107 may also transmit information to the network device 101 as a sender.
  • the terminal device 105, the terminal device 106, and the terminal device 107 may also constitute a communication system.
  • the terminal device 105 can function as a sender, and the terminal device 106 and the terminal device 107 can act as a receiver.
  • the terminal device 106 and the terminal device 107 may also function as senders, and the terminal device 105 acts as a receiver.
  • the network device 101 can communicate directly with the terminal device, or can communicate indirectly.
  • the terminal device 102 to the terminal device 104 can directly communicate with the network device 101, and the terminal device 106 and the terminal device 107 also Communication with the network device 101 is possible through the terminal device 105.
  • the communication system 100 is not limited to include only network devices and terminal devices.
  • the communication system 100 may further include a network controller, a mobility management entity, and the like.
  • the network entity is not limited to this embodiment.
  • the communication system 100 may be various radio access technology (RAT) systems, such as, for example, code division multiple access (CDMA), time division multiple access (time division). Multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency-division multiple access (OFDMA), single carrier frequency division multiple access (single carrier FDMA, SC-FDMA) ) and other systems.
  • RAT radio access technology
  • CDMA code division multiple access
  • time division time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency-division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA2000 can cover the interim standard (IS) 2000 (IS-2000), IS-95 and IS-856 standards.
  • the TDMA system can implement a wireless technology such as a global system for mobile communication (GSM).
  • GSM global system for mobile communication
  • An OFDMA system can implement such as evolved universal radio land access (evolved UTRA, E-UTRA), ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA And other wireless technologies.
  • UTRA and E-UTRA are UMTS and UMTS evolved versions.
  • the various versions of 3GPP in Long Term Evolution (LTE) and LTE-based evolution are new versions of UMTS that use E-UTRA.
  • the communication system can also be applied to the future-oriented communication technology, and the technical solution provided by the embodiment of the present application is applicable to the communication system including the new communication technology, including the establishment of the bearer.
  • the system architecture and the service scenario described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation of the technical solutions provided by the embodiments of the present application.
  • the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.
  • the network device 101 is a device deployed in a radio access network to provide a wireless communication function for a UE.
  • the base station may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like.
  • the name of a device having a base station function may be different, for example, in an LTE system, an evolved Node B (evolved NodeB, eNB or eNodeB), in the third In a 3rd generation (3G) system, it is called a Node B or the like.
  • eNB evolved Node B
  • 3G 3rd generation
  • the terminal devices 102 to 107 may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem.
  • the UE may also be referred to as a mobile station (MS), a terminal, a terminal equipment, and may also include a subscriber unit, a cellular phone, and a smart phone.
  • Phone personal digital assistant (PDA) computer, tablet computer, wireless modem, handheld, laptop computer, cordless phone Or a wireless local loop (WLL) station, a machine type communication (MTC) terminal, and a wearable device.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine type communication
  • a plurality means two or more.
  • "and/or” describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately.
  • the character "/" generally indicates that the contextual object is an "or" relationship.
  • the communication system shown in FIG. 1 can be specifically applied to a scenario of a narrowband internet of things (NB-IOT).
  • the narrowband physical random access channel (NPRACH) is an uplink random access channel of the NB-IoT system.
  • the uplink of the NB-IoT system adopts a single carrier frequency division multiple access (SC-FDMA) technology, so that uplink data of different terminal devices can reach the network device at the same time.
  • SC-FDMA single carrier frequency division multiple access
  • the side avoids causing interference between each other, and the terminal device needs to perform a random access procedure before transmitting the uplink data.
  • the terminal device first transmits a random access signal on the random access channel.
  • the random access preamble (preamble) in the NB-IoT system consists of a symbol group of a single subcarrier frequency hopping.
  • 2 is a schematic diagram of a configuration of a random access preamble.
  • a random access preamble is composed of 4 symbol groups, each symbol group includes one cyclic prefix and five symbols, and each symbol on each symbol group carries a sequence of 1.
  • the random access preamble can be repeated multiple times according to the repetition number of the network configuration, and the frequency domain location of the NPRACH transmission is limited to 12 subcarriers, and the frequency domain frequency hopping range is within 12 subcarriers. As shown in FIG.
  • the vertical direction is a subcarrier index
  • #0 to #11 represent 12 subcarriers.
  • the bandwidth of one NB-IoT carrier is 180 kHz
  • an NPRACH random access preamble occupies one subcarrier
  • the four symbol groups of the random access preamble in each repetition period are filled with rectangles and numbers by the left line, and are recorded as first, second, and third in chronological order.
  • the fourth symbol group is represented by the numbers 1, 2, 3, and 4.
  • the random access preamble has two frequency hopping intervals in one repetition period, which are 3.75 kHz and 22.5 kHz, respectively.
  • the hopping interval is an integer multiple of the subcarrier bandwidth, and the minimum hopping interval and the subcarrier bandwidth are the same.
  • the frequency hopping interval between the first symbol group and the second symbol group is 3.75 kHz
  • the frequency hopping interval between the third symbol group and the fourth symbol group is 3.75 kHz.
  • the hopping interval between the second symbol group and the third symbol group is 22.5 kHz.
  • Pseudo-random frequency hopping is used between two consecutive repetition periods.
  • the frequency hopping interval between two repetition periods is determined according to a pseudo-random sequence, and is marked with an elliptical dashed box in FIG. 2, and the frequency hopping range is limited to 12 subcarriers. .
  • the sequence of all symbols carried on each symbol group in the random access preamble of the NPRACH is 1, which is the same for all cells in the NB-IoT system. Therefore, for the serving cell of the terminal device, that is, the target cell, if the NPRACH resources configured by the target cell and the interfering cell overlap, the false alarm problem may occur due to the interference of the NPRACH sent by the terminal device that receives the interfering cell. That is, the target cell detects the NPRACH signal when the serving cell does not have the terminal device transmitting the NPRACH signal.
  • the frequency hopping interval between two consecutive repetition periods is determined according to a pseudo-random sequence, and the initialization of the pseudo-random sequence is performed.
  • the seed is a cell identifier.
  • NPRACH transmissions require more repetition. If the NPRACH resources of the target cell and the interfering cell are overlapped, and the frequency hopping range is only 12 subcarriers, the target cell and the interfering cell may still collide in multiple repetition periods, thereby increasing the false alarm probability of the target cell.
  • the resource configuration of the NPRACH has a frequency domain offset and a time domain offset.
  • the transmission bandwidth of the NB-IoT carrier is only 180 kHz, and the maximum random access preamble of 48 NPRACH is supported.
  • the frequency hopping range of a random access preamble is 12 subcarriers, and each cell needs to be configured with 1 ⁇ There are three resources of coverage level. Therefore, it is difficult to completely shift the inter-cell frequency allocation. Even if it is staggered, the multiplexing factor is very limited, and it can not achieve a good interference randomization effect.
  • the time domain offset the inter-cell time domain configuration is staggered and requires network synchronization. Currently, network synchronization deployment scenarios are not commonly used. If the small cell is a low-power wireless access node, the denser deployment will make the inter-cell interference problem more significant.
  • the terminal device cannot Differentiate the cell.
  • the existing random access preamble transmission mechanism there is pseudo-random frequency hopping between two consecutive repetition periods, but since the frequency hopping range is only 12 subcarriers, in a deep coverage scenario, more The number of repetitions, the target cell and the interfering cell may still collide in multiple repetition periods, resulting in an increase in the false alarm probability of the target cell.
  • the NPRACH resource configuration in the existing random access preamble transmission mechanism has a frequency domain offset and a time domain offset.
  • the multiplexing factor is limited, and a good interference randomization effect cannot be achieved.
  • the inter-cell time domain configuration is staggered and requires network synchronization.
  • the network synchronization deployment scenario is not commonly used. If the subsequent cell supports small cells, the denser deployment will make the inter-cell interference problem more significant.
  • the embodiment of the present application proposes a random access preamble transmission method, which can reduce the false alarm problem of the target cell caused by inter-cell interference.
  • the present application provides a flowchart of a method for transmitting a random access preamble, where the terminal device in the process may be the terminal device 102 to the terminal device 107 in the communication system 100 shown in FIG. Any of the devices, the network device may be the network device 101 in the communication system 100 shown in FIG. 1 above. As shown in Figure 3, the process is specifically as follows:
  • Step S301 The terminal device determines the scrambling code sequence according to the cell identifier and the first parameter.
  • the first parameter may include one or more of the following: a subcarrier index of a first symbol group of the random access preamble, and a subcarrier of the plurality of symbol groups of the random access preamble
  • the first parameter may further include a period of a resource of a random access preamble (or NPRACH), a number of subcarriers allocated to a random access preamble (or NPRACH), and a start of contention based random access.
  • the first parameter may also include other parameters, which are not limited herein.
  • the first parameter when the first parameter includes the foregoing multiple parameters, different parameters may be arbitrarily combined.
  • the subcarrier index of the first symbol group of the random access preamble may be performed with the length of the scrambling code sequence.
  • the combination, ie, the first parameter may include a subcarrier index and a scrambling code sequence length of the first symbol group of the random access preamble.
  • the carrier index of the random access preamble can be combined with the scrambling code sequence length, that is, the first parameter can include the carrier index and the scrambling code sequence length of the random access preamble.
  • the subcarrier index of the first symbol group of the random access preamble may be combined with the scrambling code sequence length and the constant term, that is, the first parameter may include a sub of the first symbol group of the random access preamble.
  • Carrier index, scrambling sequence length and constant term which of the above parameters is included in the first parameter is not specifically limited.
  • a random access preamble may include four symbol groups, and the four symbol groups may be a first symbol group, a second symbol group, a third symbol group, and a fourth symbol group, respectively.
  • a random access preamble may also include less than or greater than 4 symbol groups, which is not limited herein.
  • Each symbol group occupies one subcarrier as an example, and each parameter in the first parameter is described in detail:
  • subcarrier index of the first symbol group of the random access preamble in the embodiment of the present application, the number of the four symbol groups in the random access preamble may be 1 to 4, that is, the corresponding number of the first symbol group 1.
  • the second symbol group corresponds to number 2
  • the third symbol group corresponds to number 3
  • the fourth symbol group corresponds to number 4.
  • the subcarrier index of the first symbol group of the random access preamble may correspond to the symbol group numbered 1.
  • the number of the four symbol groups of the random access preamble may also be 0 to 3, that is, the first symbol group corresponds to the number 0, the second symbol group corresponds to the number 1, the third symbol group corresponds to the number 2, and the fourth symbol group corresponds to the number 3.
  • the subcarrier index of the first symbol of the random access preamble may correspond to the subcarrier index of the symbol group numbered 0 above.
  • subcarrier index of a plurality of symbol groups of the random access preamble specifically including a subcarrier index of the first symbol group, a subcarrier index of the second symbol group, a subcarrier index of the third symbol group, and a fourth The subcarrier index of the symbol group.
  • the scrambling code sequence includes 5 scrambling codes: C(0), C(1), C(2), C(3), C(4), respectively, then the scrambling sequence The length can be 5.
  • the scrambling code sequence includes three scrambling codes, namely C(0), C(1), and C(2), respectively, and the scrambling code sequence may have a length of three. The length of the scrambling code sequence is not limited.
  • Carrier index of the random access preamble refers to the index of the carrier corresponding to the random access preamble.
  • the 16 carriers can be numbered 0-15 or 1-16.
  • the carrier number is 0, and 15 non-anchor carriers are numbered sequentially. It is 1-15. If the carrier corresponding to the random access preamble is an anchor carrier, the index of the carrier corresponding to the random access preamble is 0.
  • the first subcarrier index of the frequency domain resource of the random access preamble refers to the frequency domain location of the first subcarrier allocated to the random access preamble (or NPRACH), which is used to indicate random access.
  • the frequency domain position or the first subcarrier index of the first subcarrier in the frequency domain resource (including one or more 45 kHz) corresponding to the preamble which may be in the range of ⁇ 0, 12, 24, 36, 2 , 18, 34 ⁇ , not limited.
  • Start transmission time of the random access preamble refers to the time when the random access preamble can start transmitting the random access preamble in the time domain of a random access resource period.
  • the period of the resource of the random access preamble refers to the time during which the resource of the random access preamble lasts.
  • the number of subcarriers allocated to the random access preamble (or NPRACH) refers to the number of subcarriers allocated to the random access preamble (or NPRACH) resources, for example, 12 or 24 or 36 or 48. Wait.
  • the starting subcarrier of the contention based random access refers to the starting subcarrier position used to calculate the contention based random access in a random access resource.
  • the number of repetitions of the random access preamble for each random access attempt refers to the number of times that the random access preamble can be repeatedly transmitted in a random access attempt, and the value may be 1, 2, 4, 8 Wait.
  • the terminal device may determine the scrambling code sequence in the following manner:
  • the first type the terminal device directly generates the scrambling code sequence according to the cell identifier and the first parameter.
  • the second type the terminal determines the scrambling code sequence index according to the cell identifier and the first parameter, and the terminal device determines the scrambling code sequence according to the correspondence between the scrambling code sequence index and the scrambling code sequence.
  • the terminal device may generate a scrambling code sequence according to the manner set by the device internally, that is, first, the scrambling code sequence function is set inside the terminal device, and the terminal device needs to perform random connection.
  • the terminal device runs the scrambling code sequence function set in the device, a scrambling code sequence is generated.
  • the terminal device can obtain the scrambling code sequence by means of a query.
  • the correspondence between the index of the scrambling code sequence and the scrambling code sequence is set in the terminal device.
  • the correspondence between the index of the scrambling sequence and the scrambling sequence may be set in the form of a table in the terminal device.
  • the terminal device obtains the index corresponding to the scrambling sequence by querying. Scrambling sequence.
  • Step S302 The terminal device scrambles the random access preamble according to the scrambling code sequence.
  • Step S303 The terminal device sends the scrambled random access preamble.
  • Step S304 The network device receives the scrambled random access preamble.
  • Step S305 The network device determines the scrambling code sequence according to the cell identifier and the first parameter.
  • the process of determining the scrambling code sequence according to the cell identifier and the first parameter, and determining the process similarity class of the scrambling code sequence according to the cell identifier and the first parameter, and the description is not repeated.
  • the step S305 is performed, that is, the network device may first perform the step S305: the network device determines the scrambling code sequence according to the cell identifier and the first parameter, and then performs step S304: the network device receives the scrambled random Access the preamble.
  • Step S306 The network device descrambles the scrambled random access preamble according to the scrambling code sequence.
  • the method further includes: receiving, by the terminal device, the first indication signaling sent by the network device, where the first indication signaling is used to indicate the Whether the terminal device scrambles the random access preamble.
  • the first indication signaling may be system message signaling, or RRC signaling, or DCI signaling.
  • the signaling type of the first signaling is not specifically limited.
  • the first indication signaling may be one bit, including two candidate values, such as 0 or 1. For the candidate value 0, the random access preamble may be scrambled, and the candidate value 1 may indicate a random access preamble.
  • the code is scrambled; or, for the candidate value 0, it may indicate that the random access preamble is not scrambled, and the candidate value 1 may indicate that the random access preamble is scrambled.
  • the first indication signaling may be only one value. If the first indication signaling is received, the random access preamble is scrambled, and the first indication signaling is not received, indicating that the random access preamble is not scrambled; or if The first indication signaling is not received to indicate that the random access preamble is scrambled, and if the first indication signaling is received, the random access preamble is not scrambled.
  • there is no limitation on how the first indication signaling indicates whether the terminal device scrambles the random access preamble.
  • the method further includes: the terminal device receiving the second indication signaling sent by the network device, where the second indication signaling is used to indicate that the terminal device uses preset scrambling
  • the method performs scrambling on the random access preamble, where the preset scrambling mode includes at least two scrambling modes.
  • a scrambling method is: directly determining a scrambling code sequence, and then scrambling the random access preamble based on the scrambling code sequence.
  • another scrambling method is: first generating a base sequence, then generating a scrambling code sequence based on the base sequence, and finally scrambling the random access preamble based on the scrambling code sequence.
  • the second indication signaling may be system message signaling, or RRC signaling, or DCI signaling.
  • the signaling type of the second signaling is not specifically limited.
  • the second indication signaling may be one bit, including two candidate values, such as 0 and 1.
  • the candidate value it may indicate that the random access preamble is scrambled by using the preset scrambling mode A, and the candidate is taken.
  • a value of 1 may indicate that the random access preamble is scrambled by using the preset scrambling mode B.
  • the candidate value of 0 may indicate that the random access preamble is scrambled by using the preset scrambling mode B, and the candidate value is used. 1 may indicate that the random access preamble is scrambled using the preset scrambling mode A.
  • the second indication signaling may be a specific value. If the second indication signaling is received, the random access preamble is scrambled by using the preset scrambling mode A, and the second indication signaling is not used to indicate that the preset scrambling is used. Mode B scrambles the random access preamble; or, if the second indication signaling is not received, uses the preset scrambling mode B to scramble the random access preamble, if the second indication signaling is received, The preset scrambling mode A scrambles the random access preamble.
  • the second indication signaling specifically indicates that the terminal device performs scrambling on the random access preamble, which is not limited.
  • the scrambling code sequence is determined by using the cell identifier and the first parameter, and the random access preamble is scrambled to ensure that when the random access resources configured by different cells are the same, different cells are used.
  • the random access preamble transmitted by the terminal device at the same subcarrier position is different, so that the problem of false alarm can be solved.
  • the scrambling code sequence is used to scramble the random access preamble, which also ensures that the random access preambles sent by different terminal devices at different subcarrier positions are different in one serving cell, thereby ensuring the serving cell.
  • Timing advance (TA) estimate is used to scramble the random access preamble.
  • the first parameter may include a subcarrier index and a scrambling code sequence length of a first symbol group of the random access preamble, and a subcarrier index of the first symbol group of the random access preamble may be specifically a random access.
  • an NPRACH resource may be 12 subcarriers, and 4 symbol groups included in a random access preamble are frequency hopped on 12 subcarriers, and the relative subcarrier index may be specifically random.
  • the relative index of the subcarriers corresponding to the first symbol group of the access preamble on the 12 subcarriers for example, the absolute subcarrier of the first symbol group of the random access preamble in 48 subcarriers at this time
  • the carrier index is 12, and the relative subcarrier index of the first symbol group of the random access preamble in the 12 subcarriers is 0.
  • a block of NPRACH resources may be 24 subcarriers, and the relative subcarrier index may be a relative index of 24 subcarriers of the subcarrier corresponding to the first symbol group of the random access preamble.
  • the process of the foregoing step S301 (the terminal device determines the random access preamble according to the cell identifier and the first parameter) may specifically be:
  • the terminal device determines the scrambling code sequence index according to the cell identifier, the subcarrier index of the first symbol group of the random access preamble, and the length of the scrambling code sequence, and then determines the scrambling code according to the correspondence between the scrambling code sequence index and the scrambling code sequence. sequence.
  • the scrambling code sequence index can satisfy the following formula (1.1):
  • the u represents the scrambling code sequence index
  • the correspondence between the scrambling sequence index and the scrambling code sequence may be followed according to the following formula (1.2), and then the correspondence between the scrambling code sequence index and the scrambling code sequence is stored in the terminal device. It can also be called a scrambling code sequence that satisfies the following formula (1.2):
  • the c(m) represents the scrambling code sequence, and the value of m is 0 to k-1, the u represents the scrambling code sequence index, and the k represents the scrambling code sequence length.
  • the scrambling code sequence index is represented by u
  • the scrambling code sequence is represented by c(m)
  • the scrambling code sequence c(m) includes five scrambling code symbols, respectively, c'(0) , c'(1), c'(2), c'(3), and c'(4).
  • the correspondence between the determined scrambling code sequence index u and the scrambling code sequence c(m) can be seen in Table 1 below:
  • the random access preamble sent by the early deployed NB-IoT terminal is a full 1 sequence, in order to avoid mutual interference with the early deployment NB-IoT terminal in the subsequent scrambling process.
  • the corresponding scrambling code sequence can be removed when the index u of the scrambling code sequence in Table 1 is equal to 0, that is, the corresponding all-one scrambling code is removed when the index u of the scrambling code sequence is equal to 0.
  • Table 2 the correspondence between the index of the scrambling code sequence and the scrambling code sequence is as shown in Table 2, and Table 2 is another scrambling sequence. A table of correspondence between indexes and scrambling sequences.
  • step S302 the terminal device scrambles the random access preamble according to the scrambling code sequence.
  • the terminal device may use the scrambling code sequence and each symbol group of the random access preamble The upper symbol is multiplied by bits, and the scrambling code of the cyclic prefix in each symbol group is the same as the scrambling code of the last symbol in the symbol group in which the cyclic prefix is located.
  • the length of the scrambling code sequence is the same as the number of symbols in a symbol group of the random access preamble, that is, the length of the scrambling code sequence is equal to 5, at this time, the length is equal to 5.
  • the scrambling code in the scrambling code sequence is respectively multiplied by the symbol alignment on each symbol group of the random access preamble to complete scrambling, and the cyclic prefix in each symbol group and the last symbol in the symbol group in which it is located
  • the scrambling code is the same.
  • 6 is a schematic diagram of a scrambling process when the length of the scrambling code sequence is the same as the number of symbols in a symbol group of the random access preamble.
  • the scrambling code sequence of length 5 can be represented by c'(0), c'(1), c'(2), c'(3), c'(4) shown in Table 1, then, The specific scrambling method can be seen in Figure 6.
  • the terminal device may use the scrambling code sequence and each of the random access preambles
  • the symbols in the repetition period are multiplied by bits, and the scrambling code of the cyclic prefix in each symbol group is the same as the scrambling code of the last symbol in the symbol group in which the cyclic prefix is located.
  • the scrambling codes in the scrambling code sequence having a length equal to 20 are respectively Multiplying the symbol pairs in each repetition period of the random access preamble completes the scrambling, and the cyclic prefix in each symbol group is the same as the scrambling code of the last symbol in the symbol group in which it is located.
  • 7 is a schematic diagram of a scrambling process when the length of the scrambling code sequence is the same as the number of symbols in one repetition period of the random access preamble.
  • the specific scrambling mode can be seen in Figure 7.
  • the terminal device may repeat all the repetitions of the scrambling code sequence and the random access preamble The symbols in the period are multiplied by bits, and the scrambling code of the cyclic prefix in each symbol group is the same as the scrambling code of the last symbol in the symbol group in which the cyclic prefix is located.
  • the terminal device sets the scrambling code sequence and each of the random access preambles
  • the symbol groups in the repetition period are multiplied by bits, and the scrambling codes of the respective symbols in each symbol group and the cyclic prefix are the same.
  • the present application further provides a correspondence between a scrambling code sequence index and a scrambling code sequence.
  • the terminal device or the network device may determine the scrambling code sequence according to the cell identifier and Table 3 below.
  • the scrambling code sequence shown in Table 3 the scrambling code sequence length is the same as the number of symbol groups in one repetition period of the random access preamble.
  • the embodiment may also remove the scrambling code sequence corresponding to the index v' of the scrambling code sequence equal to 0, that is, the index v' of the scrambling code sequence.
  • the correspondence between the index of the scrambling code sequence and the scrambling code sequence can be as shown in Table 4.
  • Table 4 is a correspondence table between the index of the scrambling code sequence and the scrambling code sequence.
  • the scrambling code sequence having a length equal to 4 is used.
  • the scrambling code is respectively multiplied by the symbol group alignment in each repetition period of the random access preamble, and the scrambling codes of the respective symbols in each symbol group are the same, and the scrambling is completed, wherein the scrambling of the cyclic prefix in each symbol group
  • the code has the same scrambling code as the last symbol in the symbol group in which the cyclic prefix is located, that is, the scrambling code of each symbol in each symbol group and the cyclic prefix is the same.
  • 8 is a schematic diagram of a scrambling process when the length of the scrambling code sequence is the same as the number of symbol groups in one repetition period of the random access preamble.
  • the scrambling code sequence of length 4 can be represented by h(w′′′), which can be a Walsh sequence of length 4 or a differential orthogonal sequence of length 4.
  • the specific scrambling method can be See Figure 8.
  • the terminal device may use the scrambling code sequence and all repetition periods of the random access preamble.
  • the symbol groups within are multiplied by bits, and the scrambling codes of the respective symbols in each symbol group and the cyclic prefix are the same.
  • the first random access preamble includes 4 symbol groups, and each symbol group includes 5 symbols and a cyclic prefix (CP) as an example for description.
  • CP cyclic prefix
  • the length of the scrambling code sequence is the same as the number of symbols in a symbol group of the random access preamble, that is, the length of the scrambling code sequence is 5, and the terminal device can be located according to the first symbol group of the random access preamble.
  • the subcarrier index, the cell ID and the scrambling code sequence length and the coefficient variable x determine the scrambling code sequence index; finally, the scrambling code sequence is determined according to the correspondence between the scrambling code sequence index and the scrambling code sequence.
  • the subcarrier index of the first symbol group of the random access preamble may be an absolute subcarrier index or a relative subcarrier index.
  • the scrambling code sequence index u may be calculated by the following formula (1.3);
  • x is the scale factor
  • Indicates the cell identity Indicates the absolute subcarrier index where the first symbol group of the random access preamble is located.
  • the scrambling code sequence index u may be calculated by the following formula (1.4);
  • the cell ID of the cell A is 100
  • the cell ID of the cell B is 101.
  • the scrambling code sequence index corresponding to the cell A calculated by using the above formula (1.3) and the scrambling code sequence u corresponding to the cell B can be referred to the following Table 5.
  • the terminal device A determines that the index of the scrambling sequence is 0 by using the above formula (1.3) or formula (1.4), and then according to the correspondence between the scrambling sequence index and the scrambling sequence.
  • the scrambling code sequence is determined (for example, the scrambling code sequence is determined according to Table 1 above).
  • the subcarrier index Transmitting the random access preamble on the corresponding subcarrier refers to the subcarrier corresponding to the first symbol group of the random access preamble of the terminal device. Send a random access preamble on it.
  • the subcarriers corresponding to the remaining symbol groups of the repeated random access preamble or the remaining symbol groups of all the repeated random access preambles may also be calculated according to the frequency hopping formula of the random access preamble. The rest of the descriptions in this document are similar and will not be described again.
  • the terminal device B of the cell A determines that the index of the scrambling code sequence is 1 by using the above formula (1.3) or formula (1.4), and then according to the correspondence between the scrambling code sequence index and the scrambling code sequence. Determining the scrambling code sequence (for example, determining the scrambling code sequence according to Table 1 above). It can be seen that, when the terminal device A and the terminal device B in the same cell send the random access preamble on different subcarriers, the scrambling code sequences used by the terminal are different. It can be guaranteed that the FFT processing does not leak, thereby ensuring the TA estimation performance of the cell A.
  • the terminal device A of the cell A determines that the index of the scrambling code sequence is 0 by using the above formula (1.3) or formula (1.4), and then according to the correspondence between the scrambling code sequence index and the scrambling code sequence. Determining the scrambling code sequence (for example, determining the scrambling code sequence according to Table 1 above).
  • the same scrambling code sequence is used on different symbol groups of the transmitted random access preamble.
  • four identical scrambling code sequences can be used for different repeated random access preambles, that is, each symbol group of each of the repeated random access preambles uses the same scrambling. Code sequence. Taking the scrambling of the first repeated random access preamble as an example, the numbers on the different symbol groups in FIG. 4 represent different scrambling code indices. In this embodiment of the present application, the terminal device may use the same scrambling code sequence on different symbol groups of the transmitted random access preamble.
  • different four scrambling code sequences can be used for different repeated random access preambles, that is, each symbol group of each random access preamble uses the same scrambling code sequence, and different repeated random accesses.
  • the four scrambling code sequences used by the preamble can be different.
  • the terminal device may determine the scrambling code sequence index according to the scrambling code according to the subcarrier index, the cell ID, the scrambling code sequence length, and the scale coefficient x where the first symbol group of the random access preamble transmitted in different repetition times is located. The relationship between the sequence index and the scrambling sequence determines the scrambling sequence.
  • the length of the scrambling code sequence may be the same as the number of symbols in a repetition period of the random access preamble, and the terminal device may perform the subcarrier index according to the first symbol group of the transmitted random access preamble.
  • the cell ID, the scrambling code sequence length, and the scale factor x determine the scrambling code sequence index.
  • the length of the scrambling code sequence should be 20, and then the scrambling code sequence can be determined according to the correspondence between the scrambling code sequence index and the scrambling code sequence. .
  • the subcarrier index in which the first symbol group of the random access preamble is located may be an absolute subcarrier index in the 48 subcarriers corresponding to 180 kHz, or may be a relative subcarrier index, that is, The relative subcarrier index in the 12 subcarriers corresponding to the frequency hopping range of the random access preamble.
  • the scrambling sequence index u can be calculated by the following formula (1.5):
  • the scrambling sequence index u can be calculated by the following formula (1.6):
  • x is the proportionality factor
  • x is the proportionality factor
  • the relative subcarrier index in which the first symbol group of the random access preamble is located for different repetitions.
  • the same scrambling code sequence may be used for different repeated transmission random access preambles.
  • the terminal device may according to the subcarrier in which the first symbol group of the random access preamble is transmitted.
  • the scrambling code index u is determined by the index, the cell ID, the scrambling code sequence length, and the scale factor x.
  • the length of the scrambling code sequence is set to be 20 rep, and the rep is the number of repetitions of the random access preamble.
  • the scrambling code sequence index may be first determined, and then according to the scrambling code. The correspondence between the sequence index and the scrambling code sequence determines the scrambling code sequence.
  • the subcarrier index of the first symbol group of the random access preamble that is repeatedly transmitted in the random access preamble that is repeatedly transmitted multiple times may be in the 48 subcarriers corresponding to 180 kHz.
  • the absolute subcarrier index may also be a relative subcarrier index, that is, a relative subcarrier index within 12 subcarriers corresponding to the hopping range of the random access preamble.
  • the scrambling code sequence index u may be calculated by using the following formula (1.7):
  • the absolute subcarrier index of the first symbol group of the random access preamble transmitted for the first time in the random access preamble is repeated multiple times.
  • the scrambling code sequence index u may be calculated by using the following formula (1.8):
  • different scrambling codes are added to the random access preambles of the target cell and the interfering cell to reduce the false alarm problem of the target cell caused by inter-cell interference.
  • the scrambling codes used on different random access preambles or different subcarriers in the same cell are different, and the performance in the cell can be guaranteed.
  • the first parameter may include a subcarrier index of the plurality of symbol groups of the random access preamble and the length of the scrambling code sequence, and the foregoing step S301 (the terminal device determines the scrambling code sequence according to the cell identifier and the first parameter)
  • the process can be as follows:
  • the random access preamble is set to include Y symbol groups, which are respectively a first symbol group, a second symbol group, and so on, up to the Yth symbol group.
  • the scrambling code sequence also includes Y, respectively, the scrambling code sequence corresponding to the first symbol group, the scrambling code sequence corresponding to the second symbol group, and so on, up to the scrambling code sequence corresponding to the Yth symbol group.
  • the process of determining the scrambling code sequence corresponding to each symbol group may be as follows:
  • the terminal device Determining, by the terminal device, the scrambling code sequence index corresponding to each symbol group according to the cell identifier, the subcarrier index of each symbol group, and the length of the scrambling code sequence; the terminal device corresponding to each symbol group according to the symbol group
  • the scrambling sequence index determines the scrambling sequence for each symbol group.
  • the scrambling code sequence index can satisfy the following formula (1.9):
  • Representing a cell identity Representing a subcarrier index of an i th symbol group in the random access preamble, where k represents a length of the scrambling code sequence
  • the correspondence between the scrambling code sequence index and the scrambling code sequence may be established based on the following formula (2.0), or may be referred to as a scrambling code sequence, and the following formula (2.0) is satisfied:
  • the c(m) represents a scrambling code sequence, and the value of the m is 0 to k-1, the k represents the length of the scrambling code sequence, and the u represents the scrambling code sequence index.
  • step S302 the terminal device scrambles according to the scrambling code sequence and randomly accesses the preamble.
  • the terminal device multiplies a symbol on each symbol group of the random access preamble by a corresponding scrambling code sequence, and a scrambling code of a cyclic prefix in each symbol group and a symbol group in the cyclic prefix
  • the scrambling code of the last symbol is the same.
  • the first random access preamble includes 4 symbol groups, and each symbol group includes 4 symbols and a cyclic prefix (CP) as an example for description.
  • CP cyclic prefix
  • the length of the scrambling code sequence may be the same as the number of symbols in a symbol group of the random access preamble, and the terminal device may be based on the subcarrier index of the current symbol group of the transmitted random access preamble.
  • the cell ID, the scrambling code sequence length and the scale factor determine the scrambling code sequence index, and then further determine the scrambling code sequence according to the correspondence between the scrambling code sequence index and the scrambling code sequence.
  • the correspondence table of the scrambling code sequence index and the scrambling code sequence in the first example can be cited.
  • Table 6 shows different cells ( Different) of the terminal device according to the subcarrier index of the current symbol group of the transmitted random access preamble
  • different scrambling code sequences may be used on different symbol groups of the transmitted random access preamble.
  • at least two different scrambling code sequences are used for four symbol groups of different repeated random access preambles, that is, each symbol of each random access preamble in all repeated random access preambles Groups can use different scrambling sequences.
  • the absolute subcarrier index in the 48 subcarriers corresponding to the 180 kHz may be the relative subcarrier index, that is, the relative subcarrier index in the 12 subcarriers corresponding to the hopping range of the random access preamble.
  • different scrambling codes are added to the random access preambles of the target cell and the interfering cell to reduce the false alarm problem of the target cell caused by the inter-cell interference, and the target cell or the interference is In the cell, the scrambling codes used on different random access preambles or different subcarriers in the same cell are different, and the performance in the cell can be guaranteed.
  • the process of the step S301 may be specifically: the terminal device according to the cell identifier and the first parameter, Determining a base sequence; the terminal device determines the scrambling code sequence according to the base sequence and a preset repetition rule.
  • the preset repetition rule may include: repeating M times for each element in the base sequence in sequence according to an arrangement order of elements in the base sequence, and determining the scrambling code sequence; Or repeating the base sequence as a whole M times to determine the scrambling code sequence, where M is an integer.
  • the following two situations may be specifically determined:
  • the terminal device may be according to the cell identifier, The subcarrier index of the first symbol group of the random access preamble and the length of the scrambling code sequence are determined to determine a base sequence index; and then the base sequence is determined according to the base sequence index.
  • the base sequence index can satisfy the following formula (2.1)
  • the p represents the base sequence index, Representing a cell identity, a subcarrier index indicating a first symbol group of the random access preamble, the q indicating a length of the base sequence;
  • the correspondence between the base sequence index and the base sequence may be established based on the following formula (2.2), or may be referred to as a base sequence, which satisfies the following formula (2.2):
  • the s(d) represents the base sequence
  • the value of d is from 0 to q-1
  • the q represents the length of the base sequence
  • the p represents the base sequence index
  • step S302 the terminal device scrambles the random access preamble according to the scrambling code sequence.
  • the terminal device may use the scrambling code sequence and the random access
  • the cyclic prefix and symbol pair on each symbol group of the preamble are multiplied by bits.
  • the terminal device may connect the scrambling code sequence with the random number The cyclic prefix and the symbol alignment are multiplied in each repetition period of the preamble.
  • the terminal device may connect the scrambling code sequence with the random number The cyclic prefix and the symbol alignment are multiplied in all repetition periods of the preamble.
  • the first parameter includes a subcarrier index of the plurality of symbol groups of the random access preamble and the scrambling code sequence length, and at the same time, setting the random access preamble to include Y symbols
  • the groups are respectively the first symbol group, the second symbol group, and so on, up to the Y symbol group, and each symbol group corresponds to a base sequence.
  • the process of determining, by the terminal device, the base sequence corresponding to each symbol group may be as follows: the terminal device may determine each according to the cell identifier, a subcarrier index of each symbol group, and a length of the scrambling code sequence. A base sequence index of a symbol group; the terminal device may determine a base sequence of each symbol group based on a base sequence index of each symbol group.
  • the base sequence index satisfies the following formula (2.3):
  • the p represents the base sequence index, Representing the cell identity, a subcarrier index indicating an i-th symbol group of the random access preamble, where q represents a base sequence length;
  • the correspondence between the base sequence index and the base sequence may be established based on the following formula (2.4), or the base sequence satisfies the following formula (2.4):
  • s(d) represents the base sequence
  • d takes values from 0 to q-1
  • q represents the length of the base sequence
  • p represents a base sequence index
  • the set base sequence index is denoted by p
  • the base sequence is denoted by s(d)
  • the base sequence s(d) includes three scrambling code symbols, respectively s(0), s(1 ) and s(2).
  • the correspondence between the base sequence index p and the base sequence s(d) can be determined.
  • the correspondence between the determined base sequence index p and the base sequence s(d) can be shown in Table 7 below:
  • the random access preamble sent by the early deployed NB-IoT terminal is a full 1 sequence, in order to avoid mutual interference with the early deployment NB-IoT terminal in the subsequent scrambling process.
  • the corresponding base sequence may be removed when the index of the base sequence in Table 7 is equal to 0, that is, the corresponding all-one scrambling code is removed when the index p of the base sequence is equal to 0.
  • the subcarrier index of the first symbol group of the random access preamble is displayed.
  • the correspondence between the index of the base sequence and the base sequence can be as shown in Table 8.
  • the process of the step S302 may be as follows: if the scrambling code sequence length is within a symbol group of the random access preamble and the cyclic prefix is The sum of the number of symbols is the same, the terminal device may multiply a scrambling code sequence of the i-th symbol group of the random access preamble with a cyclic prefix and a symbol corresponding to the i-th symbol group, i takes values from 1 to Y in order.
  • the first random access preamble includes 4 symbol groups, and each symbol group includes 4 symbols and a cyclic prefix (CP) as an example for description.
  • CP cyclic prefix
  • the manner in which the terminal device obtains the scrambling code sequence may also be that the terminal device acquires the scrambling code sequence based on the base sequence.
  • the terminal device may first acquire the base sequence, and then the terminal device may obtain the scrambling sequence according to the base sequence and the preset repetition rule.
  • the terminal device may generate at least two types, that is, the terminal device generates a base sequence, and the terminal device obtains a scrambling code sequence according to the base sequence and the preset repetition rule; or, the terminal device acquires the base according to the correspondence between the index of the base sequence and the base sequence.
  • the sequence, the scrambling sequence is obtained according to the base sequence and the preset repetition rule.
  • the terminal device repeatedly processes at least one element in the base sequence according to a preset repetition rule to obtain a scrambling code sequence.
  • the preset repetition rule is to sequentially repeat M times for each element in the base sequence to obtain a scrambling code sequence.
  • the length of the scrambling code sequence may be the same as the number of CPs in a symbol group of the random access preamble, that is, the length of the scrambling code sequence is 6, and the length of the base sequence is 3
  • a 3-long base sequence can be obtained according to formula (2.1) or formula (2.3).
  • the length of the scrambling code sequence may be the same as the number of the CP plus the number of symbols in a repetition period of the random access preamble, that is, the length of the scrambling code sequence is 24, and the base sequence length is 12
  • a 12-long base sequence can be obtained according to formula (2.1) or formula (2.3).
  • the length of the scrambling code sequence may be the same as the number of the CP plus the number of symbols in all the repetition periods of the random access preamble, that is, the length of the scrambling code sequence is 24 rep. At this time, the base sequence length is 12 rep.
  • a 12rep long base sequence can be obtained according to formula (2.1) or formula (2.3).
  • the scrambling code sequence when used to scramble the random access preamble, it belongs to symbol level scrambling.
  • the scrambling code length is 5
  • the terminal device will scramble the code sequence and each of the random access preambles.
  • the symbols on the symbol group are multiplied by bits, and the scrambling code of the cyclic prefix in each symbol group is the same as the scrambling code of the last symbol in the symbol group in which the cyclic prefix is located.
  • the scrambling code length is 6 by the base sequence
  • the terminal device multiplies each scrambling code in the scrambling code sequence by the CP and each symbol of the symbol group in the random access preamble.
  • the scrambling code sequence may also be an orthogonal sequence, a ZC sequence, a pseudo random sequence, a differential orthogonal sequence, or a scrambling code difference on a symbol group in each repetition period.
  • the obtained sequence is orthogonal, or the subset of the sequence obtained by the scrambling code difference on the symbol group in each repetition period is orthogonal.
  • the specific implementation manner of the terminal device acquiring the scrambling code sequence or the base sequence is to generate a pseudo-random sequence for the terminal device.
  • the initialization seed of the pseudo random sequence may be a function of at least one of a cell identifier, a superframe number, a frame number, a symbol index, a symbol group index, a repetition number, a subcarrier index, and a carrier index.
  • the pseudo random sequence may be an m sequence, an M sequence, a Gold sequence, or the like.
  • the initialization seed of the pseudo-random sequence may be a function of a cell identifier, a superframe number, a frame number, a symbol index, a symbol group index, a repetition number, a subcarrier index, and a carrier index, or an initialization seed of the pseudo random sequence is a cell identifier, and a super A function of a partial combination of a frame number, a frame number, a symbol index, a symbol group index, a repetition number, a subcarrier index, and a carrier index.
  • the scrambling code sequence generated by the terminal device may also be obtained by using a cyclic extension of a ZC sequence or a ZC sequence.
  • the base sequence generated by the terminal device can also be obtained by cyclic extension of the ZC sequence or the ZC sequence.
  • a ZC sequence of length N ZC can be expressed by the following formula (2.5):
  • N S the length of the scrambling code sequence or the base sequence generated by the terminal device
  • N ZC of the ZC sequence should be selected to be less than or equal to the maximum prime number of N S , and at this time, the interference generated by the terminal device
  • the code sequence or base sequence can be expressed by the following formula (2.6):
  • the initialization seed of the ZC sequence or the cyclic shift of the ZC sequence is related to the cell identity.
  • the scrambling code sequence or the base sequence obtained by the terminal device may further satisfy the following conditions: the scrambling code sequence corresponding to the index of the different scrambling code sequence or the base sequence or the sequence obtained after the base sequence difference is orthogonal, or different The scrambling code sequence or the sequence sequence corresponding to the scrambling code sequence or the base sequence index is orthogonal between the sequence subsets obtained.
  • any one of the scrambling code sequence indexes in the first example, the second example or the third example herein may be used, that is, the first example, the second example or the third example may be adopted.
  • Determining the scrambling code sequence index of the scrambling code sequence index the scrambling code sequence corresponding to the index of the determined scrambling code sequence may be any one of the scrambling code sequences, such as: an orthogonal sequence, a ZC sequence, a pseudo-random sequence, a differential orthogonal sequence, or a sequence obtained by subtracting a scrambling code on a symbol group in each repetition period, or a difference obtained by a scrambling code difference on a symbol group in each repetition period
  • the subset of sequences is orthogonal, and so on.
  • different scrambling code sequences can be synchronously orthogonal or cyclically moved orthogonally by using the methods disclosed in the first example, the second example, and the third example.
  • the scrambling codes added to the symbol group of the cell A are a(0), a(1), ..., a(k-1), the symbol group of the cell B.
  • the scrambling codes added are b(0), b(1), ..., b(k-1). Since the two cells are not necessarily synchronized in time, the scrambling code satisfies the synchronous orthogonality and is also orthogonal under the cyclic shift. That is, the scrambling code sequence satisfies the condition that the synchronization orthogonal or cyclic shift orthogonal needs to be satisfied between the scrambling code sequences of the cell A and the cell B.
  • using the above scrambling code sequence not only ensures synchronous orthogonality between different scrambling code sequences, but also ensures that cyclic motion of different scrambling code sequences is orthogonal.
  • the present application provides a transmission apparatus 900 for randomly accessing a preamble, and the apparatus includes a processing unit 901 and a transceiver unit 902.
  • the transmission device 900 of the random access preamble may be a terminal device side, or a chip applied to the terminal device, and the processing unit 901 may be configured to use, according to the cell identifier and the first parameter, Determining the scrambling code sequence and scrambling the random access preamble according to the scrambling code sequence.
  • the transceiver unit 902 can be configured to send the scrambled random access preamble.
  • the transmission device 900 of the random access preamble is applicable to the network device side, and the transceiver unit 902 is configured to receive the scrambled random access preamble.
  • the processing unit 901 is configured to determine a scrambling code sequence according to the cell identifier and the first parameter, and perform descrambling on the scrambled random access preamble according to the scrambling code sequence to obtain a descrambled random access preamble. .
  • the processing unit 901 and the transceiver unit 902 on the terminal device side and the network device side refer to the description of the process in FIG. 3 above, and details are not described herein.
  • the present application provides a transmission device 1000 for accessing a preamble, which may be a network device or a chip applied to a network device, and the device 1000 may be a terminal.
  • a transmission device 1000 for accessing a preamble, which may be a network device or a chip applied to a network device, and the device 1000 may be a terminal.
  • the apparatus 1000 can include a processor 1010 and a memory 1020. Further, the device 1000 may further include a receiver 1040 and a transmitter 1050. Still further, the apparatus can also include a bus system 1030.
  • the processor 1010, the memory 1020, the receiver 1040, and the transmitter 1050 may be connected by a bus system 1030 for storing instructions for executing instructions stored in the memory 1020 to control the receiver 1040.
  • the signal is received, and the transmitter 1050 is controlled to send a signal, and the steps of the network device side or the terminal device side in the flow shown in FIG. 3 are completed.
  • the receiver 1040 and the transmitter 1050 may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.
  • the memory 1020 may be integrated in the processor 1010 or may be provided separately from the processor 1010.
  • the functions of the receiver 1040 and the transmitter 1050 can be implemented by a dedicated chip through a transceiver circuit or a transceiver.
  • the processor 1010 can be implemented by a dedicated processing chip, a processing circuit, a processor, or a general purpose chip.
  • a wireless access network device provided by an embodiment of the present invention may be implemented by using a general-purpose computer.
  • Program code that implements the functions of processor 1010, receiver 1040, and transmitter 1050 is stored in a memory that implements the functions of processor 1010, receiver 1040, and transmitter 1050 by executing code in memory.
  • the apparatus 1010 is applicable to a terminal device side, and the processor 1010 may determine a scrambling code sequence according to the cell identifier and the first parameter, and then, according to the scrambling code sequence, a random access preamble. The scrambling is performed, and the transmitter 1050 can transmit the scrambled random access preamble.
  • the receiver 1040 may receive the scrambled random access preamble, and the processor 1010 may determine the scrambling code according to the first parameter and the cell identifier. And performing a descrambling on the scrambled random access preamble according to the scrambling code sequence to determine a descrambled random access preamble.
  • the embodiment of the present invention further provides a communication system, which includes the foregoing terminal device and network device.
  • the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, and the software program can implement any one or more of the foregoing when being read and executed by one or more processors.
  • the computer storage medium may include various media that can store program codes, such as a USB flash drive, a removable hard disk, a read only memory, a random access memory, a magnetic disk, or an optical disk.
  • the embodiment of the present application further provides a chip, where the chip includes a processor, for implementing functions related to any one or more of the foregoing embodiments, for example, acquiring or processing information involved in the foregoing method or Message.
  • the chip further includes a memory for the processor to execute necessary program instructions and data.
  • the chip can be composed of a chip, and can also include a chip and other discrete devices.
  • the processor may be a central processing unit (“CPU"), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and dedicated integration. Circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory can include read only memory and random access memory and provides instructions and data to the processor.
  • a portion of the memory may also include a non-volatile random access memory.
  • the bus system may include a power bus, a control bus, and a status signal bus in addition to the data bus.
  • a power bus may include a power bus, a control bus, and a status signal bus in addition to the data bus.
  • the various buses are labeled as bus systems in the figure.
  • the processor in the embodiment of the present application may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or a transistor logic device, a discrete hardware component, and may implement or execute the present invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software units in the processor.
  • the program code executed by the processor to implement the above method may be stored in a memory.
  • the memory is coupled to the processor.
  • the processor may operate in conjunction with the memory.
  • the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or a volatile memory such as a random access memory (random- Access memory, RAM).
  • a memory is any other medium that can be used to carry or store desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un appareil et un procédé de transmission d'un préambule d'accès aléatoire. Le procédé comprend les étapes suivantes : un dispositif terminal détermine une séquence de code de brouillage conformément à un identifiant de cellule et à un premier paramètre ; le dispositif terminal brouille le préambule d'accès aléatoire conformément à la séquence de code de brouillage ; le dispositif terminal transmet le préambule d'accès aléatoire brouillé. L'appareil et le procédé de la présente invention permettent de résoudre le problème d'une fausse alarme.
PCT/CN2018/086613 2018-05-11 2018-05-11 Appareil et procédé de transmission d'un préambule d'accès aléatoire WO2019213972A1 (fr)

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PCT/CN2018/086613 WO2019213972A1 (fr) 2018-05-11 2018-05-11 Appareil et procédé de transmission d'un préambule d'accès aléatoire

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