CN111937477B - Method and device for transmitting random access lead code - Google Patents

Method and device for transmitting random access lead code Download PDF

Info

Publication number
CN111937477B
CN111937477B CN201880092067.9A CN201880092067A CN111937477B CN 111937477 B CN111937477 B CN 111937477B CN 201880092067 A CN201880092067 A CN 201880092067A CN 111937477 B CN111937477 B CN 111937477B
Authority
CN
China
Prior art keywords
scrambling
random access
sequence
access preamble
scrambling code
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201880092067.9A
Other languages
Chinese (zh)
Other versions
CN111937477A (en
Inventor
苏俞婉
罗之虎
金哲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of CN111937477A publication Critical patent/CN111937477A/en
Application granted granted Critical
Publication of CN111937477B publication Critical patent/CN111937477B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Abstract

A method and a device for transmitting a random access preamble code are provided, wherein the method comprises the following steps: the terminal equipment determines a scrambling code sequence according to the cell identification and the first parameter; the terminal equipment scrambles the random access lead code according to the scrambling code sequence; the terminal equipment sends the scrambled random access lead code; by adopting the method and the device, the problem of false alarm can be solved.

Description

Method and device for transmitting random access lead code
Technical Field
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.
Background
A narrow-band Internet of things (NB-IoT) system is an Internet of things provided aiming at meeting special requirements of coverage enhancement, support of a large amount of low-rate equipment, low cost, low energy consumption and the like in Internet of things application. A Narrowband Physical Random Access Channel (NPRACH) is an uplink random access channel of the NB-IoT system. An uplink of the NB-IoT system employs a single-carrier frequency-division multiple access (SC-FDMA) technique, and in order to ensure that uplink data of different terminal devices can reach a base station side at the same time to avoid interference between the different terminal devices, the terminal devices need to perform a random access process before transmitting the uplink data.
At present, in the NB-IoT system, the random access signal transmitted by the terminal device on the random access channel is an NB-IoT random access preamble (preamble) composed of a symbol group of single sub-carrier frequency hopping. Specifically, a preamble is composed of 4 symbol groups, and each symbol in each symbol group carries a sequence of 1. Since the sequence carried by 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 it is not possible to distinguish between cells. Therefore, when NPRACH resources configured by the target cell and the interfering cell overlap, the target cell may generate a false alarm problem due to NPRACH interference received from the terminal device of the interfering cell, that is, the target cell may appear in the jurisdiction range of the target cell, and no terminal device transmits an NPRACH signal, but the target cell may detect the NPRACH signal.
Disclosure of Invention
The embodiment of the application provides a method and a device for transmitting a random access preamble, which are used for solving the problem of false alarm.
In a first aspect, the present application provides a method for transmitting a random access preamble, including: the terminal equipment determines a scrambling code sequence according to the cell identifier and the first parameter; the terminal equipment scrambles the random access lead code according to the scrambling code sequence; and the terminal equipment sends the scrambled random access lead code.
In the embodiment of the application, the cell identifier and the first parameter are used for determining the scrambling code sequence and scrambling the random access preamble code, so that the random access preamble codes sent by terminal equipment in different cells at the same subcarrier position are different when random access resources configured in different cells are the same, and the problem of false alarm can be solved. Meanwhile, the scrambling code sequence is adopted to scramble the random access lead code, and the random access lead codes sent by different terminal equipment at different subcarrier positions in one service cell can be ensured to be different, so that TA estimation of the service cell can be ensured.
In an embodiment of the application, the first parameter comprises one or more of: a subcarrier index of a first symbol group of the random access preamble, subcarrier indexes of a plurality of symbol groups of the random access preamble, the scrambling sequence length, 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 transmission time of the random access preamble.
In the first example of the present application, when the first parameter includes a subcarrier index of a first symbol group of the random access preamble and the scrambling sequence length, the determining, by the terminal device, a scrambling sequence according to a cell identifier and the first parameter includes: the terminal equipment determines a scrambling code sequence index according to a cell identifier, a subcarrier index of a first symbol group of the random access preamble code and the scrambling code sequence length; and the terminal equipment determines the scrambling code sequence according to the scrambling code sequence index.
For the first example above, the scrambling sequence index may satisfy the following equation:
Figure GPA0000294569050000041
or ,
Figure GPA0000294569050000042
wherein the u represents the scrambling code sequence index, the
Figure GPA0000294569050000043
Represents the cell identity, the
Figure GPA0000294569050000044
A subcarrier index representing a first symbol group of the random access preamble, wherein k represents a scrambling sequence length;
the scrambling code sequence can satisfy the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents the scrambling code sequence, 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.
For the first example, the length of the scrambling sequence is the same as the number of symbols in one symbol group of the random access preamble, and the terminal device scrambles the random access preamble according to the scrambling sequence, including: and the terminal equipment multiplies the scrambling code sequence by a symbol bit on each symbol group of the random access preamble code, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group where the cyclic prefix is positioned.
For the first example, the length of the scrambling code sequence is the same as the number of symbols in one repetition period of the random access preamble code, and the terminal device scrambles the random access preamble code according to the scrambling code sequence, including: and the terminal equipment multiplies the scrambling code sequence by a symbol bit in each repetition period of the random access preamble code, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group in which the cyclic prefix is positioned.
For the first example, the length of the scrambling code sequence is the same as the number of symbols in all repetition periods of the random access preamble code, and the terminal device scrambles the random access preamble code according to the scrambling code sequence, including: and the terminal equipment multiplies the scrambling code sequence by the symbol in all the repetition periods of the random access preamble code, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group in which the cyclic prefix is positioned.
For the first example, the length of the scrambling sequence is the same as the number of symbol groups in one repetition period of the random access preamble, and the terminal device scrambles the random access preamble according to the scrambling sequence, including: and the terminal equipment multiplies the scrambling code sequence by a symbol group in each repetition period of the random access lead code, and each symbol in each symbol group is the same as the scrambling code of the cyclic prefix.
For the first example, the length of the scrambling code sequence 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, including: and the terminal equipment multiplies the scrambling code sequence by symbol groups in all the repetition periods of the random access lead code, and the scrambling codes of all symbols in each symbol group and the cyclic prefix are the same.
In a second example of the present application, when the first parameter includes subcarrier indexes of a plurality of symbol groups of the random access preamble and the scrambling sequence length, the determining, by the terminal device, a scrambling sequence according to a cell identifier and the first parameter includes: the terminal equipment determines the scrambling code sequence index of each symbol group according to the cell identification, the subcarrier index of each symbol group and the scrambling code sequence length; and the terminal equipment determines the scrambling code sequence of each symbol group according to the scrambling code sequence index of each symbol group.
For the second example, the scrambling code sequence index satisfies the following formula:
Figure GPA0000294569050000045
or ,
Figure GPA0000294569050000046
wherein, the
Figure GPA0000294569050000047
Represents a cell identity, said
Figure GPA0000294569050000048
A subcarrier index representing an ith symbol group in the random access preamble, the k representing the scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents a scrambling code sequence, 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 index of the scrambling code sequence.
For the second example, the length of the scrambling sequence is the same as the number of symbols in one symbol group of the random access preamble, and the terminal device scrambles the random access preamble according to the scrambling sequence, including: and the terminal equipment correspondingly multiplies the symbols on each symbol group of the random access lead code with the corresponding scrambling code sequence, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group where the cyclic prefix is positioned.
In a third example of the present application, the determining, by the terminal device, a scrambling code sequence according to a cell identifier and a first parameter includes: the terminal equipment determines a base sequence according to the cell identifier and the first parameter; the terminal equipment determines the scrambling code sequence according to the base sequence and a preset repetition rule
Wherein the preset repetition rule may include: repeating each element in the base sequence for M times in sequence according to the arrangement sequence of the elements in the base sequence, and determining the scrambling code sequence; or repeating the base sequence for M times to determine the scrambling code sequence, wherein M is an integer.
In a first case of the third example, when the first parameter includes a subcarrier index of a first symbol group of the random access preamble and the scrambling sequence length, the determining, by the terminal device, a base sequence according to the cell identifier and the first parameter includes: the terminal equipment determines a base sequence index according to the cell identification, the subcarrier index of the first symbol group of the random access preamble code and the length of the scrambling code sequence; and the terminal equipment determines the base sequence according to the base sequence index.
For the first case of the third example above, the base sequence index satisfies the following formula:
Figure GPA0000294569050000051
or ,
Figure GPA0000294569050000052
wherein said p represents said base sequence index, said
Figure GPA0000294569050000053
Represents a cell identity, said
Figure GPA0000294569050000054
A subcarrier index representing a first symbol group of the random access preamble, the q representing a length of the base sequence;
the base sequence satisfies the following formula:
s(d)＝ej2pdπ/q
wherein s (d) represents the base sequence, d has a value from 0 to q-1, q represents the length of the base sequence, and p represents the base sequence index.
For the first case of the third example, the length of the scrambling sequence 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 scrambles the random access preamble according to the scrambling sequence, including: the terminal device multiplies the scrambling sequence by a cyclic prefix and a symbol pair on each symbol group of the random access preamble code.
For the first case of the third example, the length of the scrambling sequence 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 scrambles the random access preamble according to the scrambling sequence, including: the terminal device multiplies the scrambling code sequence by a cyclic prefix and a symbol alignment in each repetition period of the random access preamble code.
For the first case of the third example, the length of the scrambling sequence is the same as the sum of cyclic prefixes and the number of symbols in all repetition periods of the random access preamble, and the terminal device scrambles the random access preamble according to the scrambling sequence, including: and the terminal equipment multiplies the scrambling code sequence by the cyclic prefix and the symbol in all the repetition periods of the random access preamble code.
In a second case of the third example, when the first parameter includes subcarrier indexes of Y symbol groups of the random access preamble and the scrambling sequence length, for an ith symbol group in the random access preamble, where i is an integer greater than or equal to 1 and less than or equal to Y, the terminal device determines, according to the cell identifier and the first parameter, a scrambling sequence corresponding to the ith symbol group, including: the terminal equipment determines a base sequence index of the ith symbol group according to the cell identifier, the subcarrier index of the ith symbol group and the length of the scrambling sequence; and the terminal equipment determines the base sequence of the ith symbol group according to the base sequence index of the ith symbol group.
For the second case of the third example above, the base sequence index satisfies the following formula:
Figure GPA0000294569050000061
or ,
Figure GPA0000294569050000062
wherein said p represents said base sequence index, said
Figure GPA0000294569050000063
Which is representative of the identity of the cell,
Figure GPA0000294569050000064
a subcarrier index representing an ith symbol group of the random access preamble, the q representing a base sequence length;
the base sequence satisfies the following formula:
s(d)＝ej2pdπ/q
wherein s (d) represents the base sequence, d has a value from 0 to q-1, q represents the length of the base sequence, and p represents the index of the base sequence.
For the second case of the third example, the length of the scrambling sequence 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 scrambles the random access preamble according to the scrambling sequence, including: and the terminal equipment correspondingly multiplies the scrambling code sequence of the ith symbol group of the random access lead code by the cyclic prefix and the symbol on the ith symbol group, wherein i is sequentially valued from 1 to Y.
In a second aspect, the present application provides a method for transmitting a random access preamble, including: the network equipment receives the scrambled random access lead code; the network equipment determines a scrambling code sequence according to the cell identification and the first parameter; and the network equipment descrambles the scrambled random access lead code according to the scrambling code sequence.
Wherein the first parameter comprises one or more of: a subcarrier index of a first symbol group of the random access preamble, subcarrier indexes of a plurality of symbol groups of the random access preamble, the scrambling sequence length, 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 transmission time of the random access preamble.
A first example, when the first parameter includes a subcarrier index of a first symbol group of the random access preamble and the scrambling sequence length, the network device determines the scrambling sequence according to a cell identifier and the first parameter, including: the network equipment determines a scrambling code sequence index according to a cell identifier, a subcarrier index of a first symbol group of the random access preamble code and the scrambling code sequence length; and the network equipment determines the scrambling code sequence according to the scrambling code sequence index.
For the first example, the scrambling code sequence index satisfies the following formula:
Figure GPA0000294569050000065
or ,
Figure GPA0000294569050000066
wherein the u represents the scrambling code sequence index, the
Figure GPA0000294569050000067
Represents the cell identity, the
Figure GPA0000294569050000068
A subcarrier index representing a first symbol group of the random access preamble, wherein k represents a scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents the scrambling code sequence, 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.
A second example, when the first parameter includes subcarrier indexes of a plurality of symbol groups of the random access preamble and the scrambling sequence length, the network device determines the scrambling sequence according to a cell identifier and the first parameter, including: the network equipment determines the scrambling code sequence index of each symbol group according to the cell identification, the subcarrier index of each symbol group and the scrambling code sequence length; and the network equipment determines the scrambling code sequence of each symbol group according to the scrambling code sequence index of each symbol group.
For the second example, the scrambling code sequence index satisfies the following formula:
Figure GPA0000294569050000071
or ,
Figure GPA0000294569050000072
wherein, the
Figure GPA0000294569050000073
Represents a cell identity, said
Figure GPA0000294569050000074
Representing the ith symbol group in the random access preambleA subcarrier index, the k representing the scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents a scrambling code sequence, 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 index of the scrambling code sequence.
In a third aspect, the present application provides a device for transmitting a random access preamble, configured for a terminal device, including: comprising means or units for performing the steps of the first aspect above.
In a fourth aspect, the present application provides an apparatus for transmitting a random access preamble, which is used for a network device, and includes: comprising means or units for performing the steps of the second aspect above.
In a fifth aspect, the present application provides an apparatus for transmitting a random access preamble, which is used for a terminal device and includes at least one processing element and at least one memory element, where the at least one memory element is used for storing programs and data, and the at least one processing element is used for executing the method provided in the first aspect of the present application.
In a sixth aspect, the present application provides an apparatus for transmitting a random access preamble, which is used in a network device and includes at least one processing element and at least one memory element, where the at least one memory element is used for storing programs and data, and the at least one processing element is used for executing the method provided in the second aspect of the present application.
In a seventh aspect, the present application provides an apparatus for transmitting a random access preamble, which is used for a terminal device and includes at least one processing element (or chip) for performing the method of the first aspect.
In an eighth aspect, the present application provides an apparatus for transmitting a random access preamble, for a network device, comprising at least one processing element (or chip) configured to perform the method of the second aspect above.
In a ninth aspect, the present application provides a program which, when executed by a processor, is operable to perform the method of any of the above aspects.
In a tenth aspect, the present application provides a program product, such as a computer readable storage medium, comprising the program of the ninth aspect.
In an eleventh aspect, the present embodiments provide a communication system, in which the transmission apparatus of the third aspect or the fifth aspect, and the transmission apparatus of the fourth aspect and the sixth aspect are included.
Drawings
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;
fig. 2 is a schematic frequency hopping diagram of a random access preamble according to an embodiment of the present application;
fig. 3 is a flow chart illustrating a transmission method of a random access preamble according to an embodiment of the present application;
fig. 4 is a diagram illustrating transmission of a random access preamble according to an embodiment of the present application;
fig. 5 is a diagram illustrating another transmission of a random access preamble according to an embodiment of the present application;
fig. 6 is a scrambling diagram of a random access preamble provided in an embodiment of the present application;
fig. 7 is another scrambling diagram of a random access preamble provided in an embodiment of the present application;
fig. 8 is a schematic diagram of further scrambling of a random access preamble provided in an embodiment of the present application;
fig. 9 is a schematic structural diagram of an apparatus for transmitting a random access preamble according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an apparatus for transmitting a random access preamble according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present application provides a communication system 100, where the communication system 100 may include a network device 101 and a plurality of terminal devices located within a coverage area of the network device 101. For example, fig. 1 exemplarily shows one network device 101 and 6 terminal devices, where the 6 terminal devices are terminal device 102, terminal device 103, terminal device 104, terminal device 105, terminal device 106, terminal device 107, and the like. In the example shown in fig. 1, the terminal device 102 is a vehicle, the terminal device 103 is an intelligent air conditioner, the terminal device 104 is an intelligent fuel dispenser, the terminal device 105 is a mobile phone, the terminal device 106 is an intelligent cup, and the terminal device 107 is a printer.
In the communication system shown in fig. 1, the network device 101 may act as a sender and may send information to one or more of the terminal devices 102 to 107. Alternatively, the terminal apparatuses 102 to 107 may also serve as senders to send information to the network apparatus 101.
In an example of the present application, optionally, in the communication system shown in fig. 1, the terminal device 105, the terminal device 106, and the terminal device 107 may also constitute a communication system. In the communication system, the terminal device 105 may serve as a sender, and the terminal devices 106 and 107 may serve as receivers. Alternatively, the terminal device 106 and the terminal device 107 may also serve as the sender, and the terminal device 105 may serve as the receiver.
In the embodiment of the present application, the network device 101 and the terminal device may communicate directly or indirectly, for example, the terminal devices 102 to 104 may communicate directly with the network device 101, and the terminal devices 106 and 107 may also communicate with the network device 101 through the terminal device 105.
It should be noted that, in the communication system 100 shown in fig. 1, the communication system 100 is not limited to include only a network device and a terminal device, for example, the communication system 100 may further include other network entities such as a network controller and a mobility management entity, and the embodiment of the present application is not limited thereto.
In the embodiment of the present application, the communication system 100 may be various Radio Access Technology (RAT) systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), single carrier FDMA (SC-FDMA), and other systems. The term "system" may be used interchangeably with "network". CDMA systems may implement wireless technologies such as Universal Terrestrial Radio Access (UTRA), CDMA2000, and the like. UTRA may include Wideband CDMA (WCDMA) technology and other CDMA variant technologies. CDMA2000 may cover the Interim Standard (IS) 2000(IS-2000), IS-95 and IS-856 standards. TDMA systems may implement wireless technologies such as global system for mobile communications (GSM). The OFDMA system may implement wireless technologies such as evolved universal radio terrestrial access (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash OFDMA, etc. UTRA and E-UTRA are UMTS as well as UMTS evolved versions. Various versions of 3GPP are new versions of UMTS using E-UTRA in Long Term Evolution (LTE) and LTE-based evolution. In addition, the communication system may also be applicable to future-oriented communication technologies, and as long as a communication system adopting a new communication technology includes establishment of a bearer, the technical solutions provided in the embodiments of the present application are applicable. The system architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
In the embodiment of the present application, the network device 101 is a device deployed in a radio access network to provide a UE with a wireless communication function. The base stations may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like. In systems using different radio access technologies, names of devices having a base station function may be different, for example, in an LTE system, the device is called an evolved node B (eNB or eNodeB), and in a third generation (3G) system, the device is called a node B (node B).
In embodiments of the present application, the terminal devices 102-107 may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem with wireless communication capabilities. The UE may also be referred to as a Mobile Station (MS), a terminal (terminal), a terminal equipment (terminal equipment), and may further include a subscriber unit (subscriber unit), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a Personal Digital Assistant (PDA) computer, a tablet computer, a wireless modem (modem), a handheld device (hand-held), a laptop computer (laptop computer), a cordless phone (cordless phone) or a Wireless Local Loop (WLL) station, a Machine Type Communication (MTC) terminal, a wearable device, and the like.
In the embodiments of the present application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In an example of the present application, the communication system shown in fig. 1 may be specifically applied to a scenario of a narrowband internet of things (NB-IOT). Wherein, a Narrowband Physical Random Access Channel (NPRACH) is an uplink random access channel of the NB-IoT system.
In this embodiment of the present application, since a single carrier frequency division multiple access (SC-FDMA) technology is adopted for an uplink of an NB-IoT system, in order to ensure that uplink data of different terminal devices can reach a network device side at the same time so as to avoid causing interference between the different terminal devices, the terminal device needs to perform a random access process before sending the uplink data. Specifically, the terminal device first transmits a random access signal on a random access channel.
A random access preamble (preamble) in an NB-IoT system consists of a single subcarrier hopped symbol group. Fig. 2 is a schematic diagram of a configuration of a random access preamble. As shown in fig. 2, a random access preamble is composed of 4 symbol groups, each symbol group includes a cyclic prefix and five symbols, and each symbol on each symbol group carries a sequence of 1. In actual transmission, the random access preamble may be repeated multiple times according to the number of repetitions of the network configuration, and the frequency domain position of NPRACH transmission may be limited to 12 subcarriers, and the frequency domain hopping range is within 12 subcarriers. As shown in fig. 2, the vertical direction is the subcarrier index, and #0 to #11 indicate 12 subcarriers. Optionally, the bandwidth of one NB-IoT carrier is 180kHz, the random access preamble of one NPRACH occupies one subcarrier, and the subcarrier bandwidth is 3.75kHz, so that at most 180/3.75 — 48 NPRACHs of random access preambles can be supported by one NB-IoT carrier.
Referring to fig. 2, four symbol groups of the random access preamble code in each repetition period are represented by left line-filled rectangles and numbers, which are denoted as a first, a second, a third, and a fourth symbol groups in chronological order, and are represented by numbers 1, 2, 3, and 4 in the figure. The random access preamble has two hopping intervals within one repetition period, which are 3.75kHz and 22.5kHz, respectively. The hopping interval is integral multiple of the sub-carrier bandwidth, and the minimum hopping interval is the same as the sub-carrier bandwidth. As shown in fig. 2, the hopping interval between the first symbol group and the second symbol group is 3.75kHz, and the hopping interval between the third symbol group and the fourth symbol group is 3.75 kHz. The hop interval between the second and third symbol groups is 22.5 kHz. Pseudo-random frequency hopping is adopted between two adjacent repetition periods, the frequency hopping interval between the two repetition periods is determined according to a pseudo-random sequence and is marked by an oval broken line frame in figure 2, and the frequency hopping range is limited within 12 sub-carriers.
In the existing random access preamble transmission mechanism, the sequence carried by all symbols on each symbol group in the random access preamble of NPRACH is 1, which is the same for all cells within the NB-IoT system. Therefore, for the serving cell of the terminal device, i.e. the target cell, if NPRACH resources configured by the target cell and the interfering cell overlap, a false alarm problem may occur due to interference of NPRACH transmitted by the terminal device receiving the interfering cell, that is, the target cell detects NPRACH signals in the case that the terminal device does not transmit NPRACH signals in the serving cell.
In the existing random access preamble transmission mechanism, pseudo-random frequency hopping is performed between two adjacent repetition periods, that is, the frequency hopping interval between two adjacent repetition periods is determined according to a pseudo-random sequence, and the initialization seed of the pseudo-random sequence is a cell identifier. In deep coverage scenarios, NPRACH transmission requires more repetitions. If the NPRACH resources configured in the target cell and the interfering cell overlap, and the frequency hopping range is only 12 subcarriers, the target cell and the interfering cell may still have multiple repetition periods to collide with each other, thereby increasing the false alarm probability of the target cell.
In addition, in the existing random access preamble transmission mechanism, the resource of the NPRACH is configured with a frequency domain offset and a time domain offset. For frequency domain bias, the transmission bandwidth of an NB-IoT carrier is only 180kHz, at most 48 random access lead codes of NPRACH are supported, the frequency hopping range of one random access lead code is 12 sub-carriers, and each cell needs to be configured with 1-3 coverage level resources, so that complete staggering difficulty through frequency division configuration among cells is high, even if staggering is performed, multiplexing factors are limited, and a good interference randomization effect cannot be achieved. For time domain offset, the time domain configuration between cells is staggered to require network synchronization, and the deployment scene application of the current network synchronization is not common. A denser deployment may make the inter-cell interference problem more pronounced if small cells are supported in subsequent evolutions (small cells are low power radio access nodes).
As can be seen from the above analysis, firstly, since the sequences carried by all symbols on each symbol group in the random access preamble of NPRACH are 1, this is the same for all cells in the NB-IoT system, and the terminal device cannot distinguish between the cells. Secondly, in the existing random access preamble transmission mechanism, pseudo-random frequency hopping is performed between two adjacent repetition periods, but the frequency hopping range is only 12 subcarriers, so that in a deep coverage scene, a large number of repetition times are required, and a target cell and an interfering cell may still have a plurality of repetition periods to collide with each other, thereby improving the false alarm probability of the target cell. Thirdly, NPRACH resources in the existing random access preamble transmission mechanism are configured with frequency domain offset and time domain offset, and for the frequency domain offset, the multiplexing factor is very limited, and a good interference randomization effect cannot be achieved. For time domain offset, network synchronization is needed when time domain configuration among cells is staggered, deployment scene application of the network synchronization is not common, and if small cells are supported in subsequent evolution, a more dense deployment can make the problem of interference among the cells more obvious.
Thus, in an NB-IoT system, there may be a target cell false alarm problem due to inter-cell interference when the random access preamble transmission of NPRACH. In view of the above problem, an embodiment of the present application provides a random access preamble transmission method, which can reduce the problem of target cell false alarm caused by inter-cell interference.
Based on the above, as shown in fig. 3, the present application provides a flowchart of a method for transmitting a random access preamble, where a terminal device in the flowchart may be any one of the terminal device 102 to the terminal device 107 in the communication system 100 shown in fig. 1, and a network device may be the network device 101 in the communication system 100 shown in fig. 1. As shown in fig. 3, the process specifically includes:
step S301: and the terminal equipment determines a scrambling code sequence according to the cell identifier and the first parameter.
In embodiments of the present application, the first parameter may include one or more of: a subcarrier index of a first symbol group of the random access preamble, subcarrier indexes of a plurality of symbol groups of the random access preamble, a scrambling sequence length, 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 transmission time of the random access preamble. On this basis, the first parameter may further include a period of a resource of the random access preamble (or NPRACH), a number of subcarriers allocated to the random access preamble (or NPRACH), a starting subcarrier of the contention based random access, a number of repetitions of the random access preamble per random access attempt, and a constant term. The first parameter may also include other parameters, which are not limited herein.
In the embodiment of the present application, when the first parameter includes the above-mentioned multiple parameters, different parameters may be arbitrarily combined, for example, the subcarrier index of the first symbol group of the random access preamble may be combined with the scrambling sequence length, that is, the first parameter may include the subcarrier index of the first symbol group of the random access preamble and the scrambling sequence length. As another example, the carrier index of the random access preamble may be combined with the scrambling code sequence length, i.e., the first parameter may include the carrier index and the scrambling code sequence length of the random access preamble. As another example, the subcarrier index of the first symbol group of the random access preamble may be combined with the scrambling sequence length and the constant term, i.e., the first parameter may include the subcarrier index of the first symbol group of the random access preamble, the scrambling sequence length, and the constant term. Which of the first parameters including all the above parameters is not particularly limited.
In an example of the present application, one random access preamble may include 4 symbol groups, and the 4 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 or more than 4 symbol groups, which is not limited herein. Each symbol group occupies one subcarrier as an example, and each parameter in the first parameters is described in detail as follows:
1) subcarrier index of the first symbol group of the random access preamble: in the embodiment of the present application, the numbers of the 4 symbol groups in the random access preamble may be 1 to 4, that is, the first symbol group corresponds to the number 1, the second symbol group corresponds to the number 2, the third symbol group corresponds to the number 3, and the fourth symbol group corresponds to the number 4, and the subcarrier index of the first symbol group in the random access preamble may correspond to the subcarrier index of the symbol group with the number 1. The numbers of the 4 symbol groups of the random access preamble code 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, the fourth symbol group corresponds to the number 3, and the subcarrier index of the first symbol of the random access preamble code may correspond to the subcarrier index of the symbol group with the number 0.
2) Subcarrier index of multiple symbol groups of random access preamble: the subcarrier index of the first symbol group, the subcarrier index of the second symbol group, the subcarrier index of the third symbol group, and the subcarrier index of the fourth symbol group may be specifically included.
3) Length of scrambling code sequence: for example, the scrambling sequence includes 5 scrambling codes: c (0), C (1), C (2), C (3), C (4), respectively, the length of the scrambling sequence may be 5. As another example, the scrambling code sequence includes 3 scrambling codes, which are C (0), C (1), and C (2), respectively, and the length of the scrambling code sequence may be 3. The length of the scrambling sequence is not limited.
4) Carrier index of random access preamble: refers to an index of a carrier corresponding to the random access preamble. For example, in the NB-IoT, there is one anchor carrier and 15 non-anchor carriers, and 16 carriers may be numbered 0 to 15 or 1 to 16, for example, the anchor carrier is numbered 0 and the 15 non-anchor carriers are sequentially numbered 1 to 15. If the carrier corresponding to the random access preamble code is an anchor carrier, the index of the carrier corresponding to the random access preamble code is 0.
5) First subcarrier index of frequency domain resource of random access preamble: the frequency domain position of the first subcarrier allocated to the random access preamble (or NPRACH) is used to indicate the frequency domain position of the first subcarrier in the frequency domain resource (including one or more 45kHz) corresponding to the random access preamble or the first subcarrier index, and the value range of the frequency domain position or the first subcarrier index may be {0, 12, 24, 36, 2, 18, 34}, which is not limited.
6) Start transmission time of random access preamble: refers to a time at which the random access preamble can start to be transmitted in a time domain within a period of a resource of one random access.
7) Periodicity of resources of random access preamble (or NPRACH): refers to the time during which the resources of the random access preamble are sustained.
8) Number of subcarriers allocated to random access preamble (or NPRACH): refers to the number of subcarriers occupied by the resource allocated to the random access preamble (or NPRACH), which may be 12, 24, 36, 48, for example.
9) Starting subcarrier of contention-based random access: refers to a position of a starting subcarrier for calculating contention based random access in a block of random access resources.
10) Number of repetitions of random access preamble per random access attempt: the number of times that the random access preamble can be repeatedly transmitted in one random access attempt is 1, 2, 4, 8, and the like.
In this embodiment, the terminal device may determine the scrambling code sequence in the following manner: the first method comprises the following steps: and the terminal equipment directly generates a scrambling code sequence according to the cell identifier and the first parameter. And the second method comprises the following steps: and the terminal determines a scrambling code sequence index according to the cell identifier and the first parameter, and the terminal equipment determines a scrambling code sequence according to the corresponding relation between the scrambling code sequence index and the scrambling code sequence.
As a first example of determining the scrambling sequence, the terminal device may generate the scrambling sequence by itself according to a mode set inside the device, that is, firstly, a scrambling sequence function formula is set inside the terminal device, and when the terminal device needs to execute a random access process, and the terminal device runs the scrambling sequence function formula set inside the device, the scrambling sequence is generated.
As an example of the second method for determining the scrambling sequence, the terminal device may obtain the scrambling sequence by means of querying. Specifically, the terminal device is provided with a corresponding relationship between the index of the scrambling code sequence and the scrambling code sequence. For example, the corresponding relationship between the index of the scrambling code sequence and the scrambling code sequence may be set in the terminal device in a form of a table, and when the terminal needs to perform the random access process, the terminal device obtains the scrambling code sequence corresponding to the index of the scrambling code sequence in an inquiry manner.
Step S302: and the terminal equipment scrambles the random access lead code according to the scrambling code sequence.
Step S303: and the terminal equipment sends the scrambled random access lead code.
Step S304: the network device receives the scrambled random access preamble.
Step S305: and the network equipment determines a scrambling code sequence according to the cell identifier and the first parameter.
In the embodiment of the present application, regarding the network device, the process of determining the scrambling code sequence according to the cell identifier and the first parameter is similar to the process of determining the scrambling code sequence according to the cell identifier and the first parameter by the terminal device, and a description thereof is not repeated. As to the sequence of steps S304 and S305, there is no limitation, that is, step S305 may be performed first: the network device determines a scrambling code sequence according to the cell identifier and the first parameter, and then executes step S304: the network device receives the scrambled random access preamble.
Step S306: and the network equipment descrambles the scrambled random access lead code according to the scrambling code sequence.
Optionally, in this embodiment of the application, before the step S302 or S303, the method may further include: and the terminal equipment receives a first indication signaling sent by the network equipment, wherein the first indication signaling is used for indicating whether the terminal equipment scrambles the random access preamble. The first indication signaling may be system message signaling, or RRC signaling, or DCI signaling, etc. The signaling type of the first signaling is not particularly limited. The first indication signaling may be one bit, and includes two candidate values, for example, 0 or 1, where the candidate value 0 may indicate that the random access preamble is scrambled, and the candidate value 1 may indicate that the random access preamble is not scrambled; or, the candidate value 0 may indicate that the random access preamble code is not scrambled, and the candidate value 1 may indicate that the random access preamble code is scrambled. The first indication signaling can be only one value, if the first indication signaling is received to indicate that the random access preamble code is scrambled, and if the first indication signaling is not received to indicate that the random access preamble code is not scrambled; or, if the first indication signaling is not received, the random access preamble code is scrambled, and if the first indication signaling is received, the random access preamble code is not scrambled. It is not limited here how the first indication signaling indicates to the terminal device whether or not the random access preamble is scrambled.
Optionally, before the step S302S303, the method may further include: and the terminal equipment receives a second indication signaling sent by the network equipment, wherein the second indication signaling is used for indicating the terminal equipment to scramble the random access preamble by using a preset scrambling mode, and the preset scrambling mode comprises at least two scrambling modes. For example, one scrambling method is: a scrambling sequence is determined directly and the random access preamble is then scrambled based on the scrambling sequence. For another example, another scrambling method is: firstly generating a base sequence, then generating a scrambling code sequence based on the base sequence, and finally scrambling the random access preamble code based on the scrambling code sequence.
In this embodiment, the second indication signaling may be system message signaling, RRC signaling, DCI signaling, or the like. The signaling type of the second signaling is not particularly limited. For example, the second indication signaling may be one bit, and includes two candidate values, such as 0 and 1, where the candidate value 0 may indicate that the random access preamble is scrambled by using the preset scrambling method a, and the candidate value 1 may indicate that the random access preamble is scrambled by using the preset scrambling method B; or, the candidate value 0 may indicate that the random access preamble is scrambled by using the preset scrambling method B, and the candidate value 1 may indicate that the random access preamble is scrambled by using the preset scrambling method a.
The second indication signaling can be a specific value, if the second indication signaling is received to indicate that the random access preamble code is scrambled by using the preset scrambling mode A, and the second indication signaling is not received to indicate that the random access preamble code is scrambled by using the preset scrambling mode B; or, if the second indication signaling is not received, the random access preamble code is scrambled by using the preset scrambling mode B, and if the second indication signaling is received, the random access preamble code is scrambled by using the preset scrambling mode A.
In this embodiment of the application, how to specifically instruct the terminal device to scramble the random access preamble is not limited.
As can be seen from the above, in the embodiment of the present application, the cell identifier and the first parameter are used to determine the scrambling sequence, and the random access preamble is scrambled, so that it can be ensured that when the random access resources configured in different cells are the same, the random access preambles sent by the terminal devices in different cells at the same subcarrier position are different, and thus the problem of false alarm can be solved. Meanwhile, the scrambling sequence is adopted to scramble the random access preamble, and the random access preambles sent by different terminal devices at different subcarrier positions in one service cell can be ensured to be different, so that the Timing Advance (TA) estimation of the service cell can be ensured.
In the embodiments of the present application, the processes of the present application will be described in detail by the following examples, and different examples do not exist independently, and may be referred to each other.
Example 1
The first parameter may include a subcarrier index of the first symbol group of the random access preamble and a scrambling sequence length, and the subcarrier index of the first symbol group of the random access preamble may be specifically an absolute subcarrier index of the first symbol group of the random access preamble or specifically a relative subcarrier index of the first symbol group of the random access preamble. For example, if a carrier bandwidth is 180KHz and a subcarrier interval is 3.75KHz, then a carrier may include 48 subcarriers, and the absolute subcarrier index of the first symbol group refers to an index within 48 subcarriers of the subcarrier corresponding to the first symbol group of the random access preamble. Meanwhile, as can be seen from fig. 2, one NPRACH resource may be 12 subcarriers, 4 symbol groups included in one random access preamble are subjected to frequency hopping on 12 subcarriers, the relative subcarrier index may specifically be a subcarrier corresponding to a first symbol group of the random access preamble, and a relative index on 12 subcarriers, for example, an absolute subcarrier index of the first symbol group of the random access preamble in 48 subcarriers is 12 at this time, and a relative subcarrier index of the first symbol group of the random access preamble in 12 subcarriers is 0. For another example, one NPRACH resource may be 24 subcarriers, and the relative subcarrier index may specifically be a subcarrier corresponding to the first symbol group of the random access preamble, and a relative index on the 24 subcarriers.
The process of the step S301 (the terminal device determines the random access preamble according to the cell identifier and the first parameter) may specifically be:
and the terminal equipment determines a scrambling code sequence index according to the cell identifier, the subcarrier index of the first symbol group of the random access preamble and the scrambling code sequence length, and then determines a scrambling code sequence according to the corresponding relation between the scrambling code sequence index and the scrambling code sequence.
In the embodiment of the present application, the scrambling code sequence index may satisfy the following formula (1.1):
Figure GPA0000294569050000141
or the like, or, alternatively,
Figure GPA0000294569050000142
or the like, or, alternatively,
Figure GPA0000294569050000143
wherein the u represents the scrambling code sequence index, the
Figure GPA0000294569050000144
Represents the cell identity, the
Figure GPA0000294569050000145
A subcarrier index representing a first symbol group of the random access preamble, k representing a scrambling sequence length, and A, B and C being constants or scaling coefficients.
In the embodiment of the present application, according to the following formula (1.2), the corresponding relationship between the scrambling code sequence index and the scrambling code sequence may be then stored in the terminal device. Also referred to as, scrambling sequence, satisfies the following formula (1.2):
c(m)＝ej2umπ/k(ii) a Formula (1.2)
Wherein, the c (m) represents the scrambling code sequence, 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.
In an example of the present application, it is assumed that the scrambling sequence is denoted by index u, the scrambling sequence is denoted by c (m), and the scrambling sequence c (m) includes five scrambling symbols, c ' (0), c ' (1), c ' (2), c ' (3), and c ' (4), respectively. Based on the formula (1.2), the determined corresponding relationship between the scrambling code sequence index u and the scrambling code sequence c (m) can be seen in the following table 1:
Figure GPA0000294569050000146
TABLE 1
In the embodiment of the present application, as described in the background art, the random access preamble sent by the early deployed NB-IoT terminal is a full 1 sequence, and in order to avoid interference with the early deployed NB-IoT terminal in the subsequent scrambling process, the scrambling code sequence corresponding to the scrambling code sequence in table 1 when the index u of the scrambling code sequence is equal to 0 may be removed, that is, the corresponding full 1 scrambling code is removed when the index u of the scrambling code sequence is equal to 0. Accordingly, the scrambling code sequence may be denoted as c '(m') ═ ej2u′m′π/5Where m' is 0, 1, …, 4,
Figure GPA0000294569050000147
is a cell identification number for the cell,
Figure GPA0000294569050000148
the subcarrier index of the first symbol group of the random access preamble is represented, and at this time, the correspondence between the index of the scrambling code sequence and the scrambling code sequence is shown in table 2, and table 2 is a correspondence table between the index of another scrambling code sequence and the scrambling code sequence.
Figure GPA0000294569050000151
TABLE 2
The process of the step S302 (the terminal device scrambles the random access preamble according to the scrambling code sequence) may be as follows:
1) if the length of the scrambling code sequence is the same as the number of symbols in one symbol group of the random access preamble code, the terminal device can multiply the scrambling code sequence with the symbol alignment on each symbol group of the random access preamble code, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group where the cyclic prefix is located.
For example, in the NB-IoT system, if the length of the scrambling sequence is the same as the number of symbols in one symbol group of the random access preamble, that is, the length of the scrambling sequence is equal to 5, at this time, the scrambling codes in the scrambling sequence with the length equal to 5 are respectively multiplied by symbol alignment bits on each symbol group of the random access preamble, scrambling is completed, and the scrambling codes of the cyclic prefix in each symbol group and the last symbol in the symbol group in which the cyclic prefix is located are the same. Fig. 6 is a schematic diagram of a scrambling process in which the length of a scrambling sequence is the same as the number of symbols in a symbol group of a random access preamble. At this time, the scrambling code sequence with the length of 5 can be represented by c ' (0), c ' (1), c ' (2), c ' (3), c ' (4) shown in table 1, and then, the specific scrambling manner can be seen in fig. 6.
2) If the length of the scrambling code sequence is the same as the number of symbols in one repetition period of the random access preamble code, the terminal device may multiply the scrambling code sequence by a symbol bit in each repetition period of the random access preamble code, 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.
For example, if the length of the scrambling code sequence is the same as the number of symbols in the repetition period of the random access preamble code, that is, the length of the scrambling code sequence is equal to 20, at this time, the scrambling codes in the scrambling code sequence with the length equal to 20 are respectively multiplied by the symbol alignment bits in each repetition period of the random access preamble code, scrambling is completed, and the cyclic prefix in each symbol group and the last symbol in the symbol group where the cyclic prefix is located are obtainedThe scrambling codes of the numbers are the same. Fig. 7 is a diagram illustrating a scrambling process in which the length of a scrambling sequence is the same as the number of symbols in one repetition period of a random access preamble. In this case, the length of the scrambling code sequence of 20 may be c ″ (m ″) or e ″j2u ″m″π/20Where m ″, is 0, 1, …, 19,
Figure GPA0000294569050000152
or
Figure GPA0000294569050000153
For cell identification, as shown in fig. 5, a specific scrambling manner can be seen in fig. 7.
3) If the length of the scrambling code sequence is the same as the number of the symbols in all the repetition periods of the random access preamble code, the terminal device may multiply the scrambling code sequence by the symbol alignment bits in all the repetition periods of the random access preamble code, 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 where the cyclic prefix is located.
4) And if the length of the scrambling code sequence is the same as the number of the symbol groups in one repetition period of the random access lead code, the terminal equipment multiplies the scrambling code sequence by the symbol group in each repetition period of the random access lead code, and each symbol in each symbol group is the same as the scrambling code of the cyclic prefix.
As shown in table 3, the present application also provides a corresponding relationship between scrambling code sequence indexes and scrambling code sequences. In this embodiment, the terminal device or the network device may determine the scrambling code sequence according to the cell identifier and the following table 3. Among the scrambling code sequences shown in table 3, 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.
Figure GPA0000294569050000161
TABLE 3
In the embodiments of the present application, the early part is avoidedThe NB-IoT terminals are deployed to interfere with each other, and this embodiment may also remove the corresponding scrambling code sequence when the index v 'of the scrambling code sequence is equal to 0, that is, remove all 1 scrambling codes when the index v' of the scrambling code sequence is equal to 0. At this time, the scrambling code sequence may be represented as h (w '), where w' is 0, 1, 2, 3, and the index of the scrambling code sequence is 0
Figure GPA0000294569050000162
In this case, the correspondence relationship between the index of the scrambling code sequence and the scrambling code sequence can be as shown in table 4, and table 4 is a correspondence relationship table between the index of another scrambling code sequence and the scrambling code sequence.
Figure GPA0000294569050000163
TABLE 4
Specifically, for example, if 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, that is, the length of the scrambling code sequence is equal to 4, at this time, the scrambling codes in the scrambling code sequence with the length equal to 4 are respectively multiplied by the symbol group bit in each repetition period of the random access preamble, and the scrambling codes of the symbols in each symbol group are the same, thereby completing scrambling, where the cyclic scrambling code 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, that is, the scrambling codes of the symbols and the cyclic prefix in each symbol group are the same. Fig. 8 is a schematic diagram of a scrambling process in which the length of a scrambling sequence is the same as the number of symbol groups in one repetition period of a random access preamble. In this case, the scrambling code sequence with the length of 4 may be represented by h (w'), which may be a walsh sequence with the length of 4, or a differential orthogonal sequence with the length of 4, and a specific scrambling method may be as shown in fig. 8.
5) If the length of the scrambling code sequence is the same as the number of the symbol groups in all the repetition periods of the random access preamble code, the terminal device can multiply the scrambling code sequence and the symbol group in all the repetition periods of the random access preamble code by bit, and each symbol in each symbol group is the same as the scrambling code of the cyclic prefix.
For the first example, the first random access preamble includes 4 symbol groups, and each symbol group includes 5 symbols and a Cyclic Prefix (CP).
In the first case: the length of the scrambling code sequence is the same as the number of symbols in one symbol group of the random access lead code, namely the length of the scrambling code sequence is 5, and the terminal equipment can determine the index of the scrambling code sequence according to the subcarrier index where the first symbol group of the random access lead code is located, the cell ID, the length of the scrambling code sequence and the coefficient variable x; and finally, determining the scrambling code sequence according to the corresponding relation between the scrambling code sequence index and the scrambling code sequence. The subcarrier index where the first symbol group of the random access preamble code is located may be an absolute subcarrier index or a relative subcarrier index.
When the subcarrier index where the first symbol group of the random access preamble code is located is an absolute subcarrier index, calculating a scrambling code sequence index u by the following formula (1.3);
Figure GPA0000294569050000171
wherein, x represents a proportionality coefficient,
Figure GPA0000294569050000172
which is indicative of the identity of the cell,
Figure GPA0000294569050000173
which represents the absolute subcarrier index at which the first symbol group of the random access preamble is located.
When the subcarrier index where the first symbol group of the random access preamble code is located is a relative subcarrier index, calculating a scrambling code sequence index u by the following formula (1.4);
Figure GPA0000294569050000174
wherein, x represents a proportionality coefficient,
Figure GPA0000294569050000175
is the identity of a cell, and is,
Figure GPA0000294569050000176
is the relative subcarrier index where the first symbol group of the random access preamble is located.
In the embodiment of the present application, two cells, cell a and cell B, are set, and the cell ID of cell a is 100 and the cell ID of cell B is 101. The scrambling code sequence index u corresponding to the cell a and the scrambling code sequence u corresponding to the cell B calculated by the above formula (1.3) are shown in the following table 5.
Figure GPA0000294569050000177
TABLE 5
In the embodiment of the present application, when the terminal device a in Cell a (Cell _ ID ═ 100) has a subcarrier index
Figure GPA0000294569050000178
When the random access preamble is sent on the corresponding subcarrier, the terminal device a determines that the index of the scrambling sequence is 0 according to the formula (1.3) or the formula (1.4), and then determines the scrambling sequence according to the corresponding relationship between the scrambling sequence index and the scrambling sequence (for example, determines the scrambling sequence according to the table 1).
It should be noted that, in the embodiment of the present application, the subcarrier index is set
Figure GPA0000294569050000179
The random access preamble sent on the corresponding subcarrier means that the terminal device sends the random access preamble on the subcarrier corresponding to the first symbol group of the random access preamble
Figure GPA00002945690500001710
And transmits a random access preamble. For the rest symbol groups of the random access preamble codes which are repeated once or the corresponding sub-symbol groups of the rest symbol groups of all the repeated random access preamble codesThe carrier may also be calculated according to a hopping formula of the random access preamble. The rest of the description is similar and will not be repeated.
In the embodiment of the present application, when the terminal device B in Cell a (Cell _ ID ═ 100) has a subcarrier index
Figure GPA00002945690500001711
When the random access preamble is sent on the corresponding subcarrier, the terminal device B determines that the index of the scrambling sequence is 1 through the above formula (1.3) or formula (1.4), and then determines the scrambling sequence according to the correspondence between the scrambling sequence index and the scrambling sequence (for example, determines the scrambling sequence according to the above table 1). It can be seen that, by using the method in the embodiment of the present application, when the terminal device a and the terminal device B in the same cell send random access preambles on different subcarriers, scrambling code sequences used by the terminal device a and the terminal device B are different, which can ensure that FFT processing is not leaked, thereby ensuring TA estimation performance of the cell a.
In the embodiment of the present application, when terminal device a of Cell a (Cell _ ID ═ 101) is to index at subcarrier
Figure GPA0000294569050000181
When the random access preamble is sent on the corresponding subcarrier, the terminal device a determines that the index of the scrambling sequence is 0 through the above formula (1.3) or formula (1.4), and then determines the scrambling sequence according to the corresponding relationship between the scrambling sequence index and the scrambling sequence (for example, determines the scrambling sequence according to the above table 1). When terminal device C of Cell B (Cell _ ID 101) wants to index at subcarrier
Figure GPA0000294569050000182
When the random access preamble is sent on the corresponding subcarrier, the terminal device C may determine that the index of the scrambling sequence is 2 through the above formula (1.3) or formula (1.4), and then determine the scrambling sequence according to the correspondence between the scrambling sequence index and the scrambling sequence (for example, determine the scrambling sequence according to the above table 1). It can be seen that, with the method of the present application, although terminal device a of cell a and terminal device C of cell B transmit random on the same subcarrierThe preamble is accessed, but the scrambling code sequences used are different, which can reduce the target cell false alarm problem caused by inter-cell interference.
In the embodiment of the present application, after the terminal device determines the scrambling sequence by using the above formula (1.3) or formula (1.4), the same scrambling sequence is used for different symbol groups of the transmitted random access preamble. At this time, four identical scrambling sequences may be used for different repeated random access preambles, i.e., each symbol group of each of all repeated random access preambles uses the same scrambling sequence. Taking the scrambling of the first repeated random access preamble as an example, the numbers on different symbol groups in fig. 4 represent different scrambling code indices. In the embodiment of the present application, the terminal device may use the same scrambling sequence on different symbol groups of the transmitted random access preamble. At this time, different four scrambling sequences may be used for different repeated random access preamble codes, that is, each symbol group of each random access preamble code uses the same scrambling sequence, and the four scrambling sequences used for different repeated random access preamble codes may be different. At this time, the terminal device may determine the scrambling code sequence index according to the subcarrier index where the first symbol group of the random access preamble transmitted with different repetition times is located, the cell ID, the scrambling code sequence length, and the proportionality coefficient x, and finally determine the scrambling code sequence according to the relationship between the scrambling code sequence index and the scrambling code sequence.
In the second case: the length of the scrambling code sequence can be the same as the number of symbols in a repetition period of the random access preamble code, the terminal device can determine the scrambling code sequence index according to the subcarrier index where the first symbol group of the transmitted random access preamble code is located, the cell ID, the length of the scrambling code sequence and the proportionality coefficient x, at this time, the length of the scrambling code sequence should be 20, and then the scrambling code sequence can be determined according to the corresponding relation between the scrambling code sequence index and the scrambling code sequence.
In this embodiment of the present application, the subcarrier index where the first symbol group of the random access preamble is located may be an absolute subcarrier index within 48 subcarriers corresponding to 180kHz, or may also be a relative subcarrier index, that is, may be a relative subcarrier index within 12 subcarriers corresponding to a frequency hopping range of the random access preamble.
When the subcarrier index where the first symbol group of the random access preamble is located is an absolute subcarrier index, the scrambling code sequence index u may be calculated by the following equation (1.5):
Figure GPA0000294569050000183
wherein, x is a proportionality coefficient,
Figure GPA0000294569050000184
is a cell identification number for the cell,
Figure GPA0000294569050000185
the absolute subcarrier index where the first symbol group of the different repeated random access preambles is located.
When the subcarrier index where the first symbol group of the random access preamble is located is a relative subcarrier index, the scrambling code sequence index u may be calculated by the following equation (1.6):
Figure GPA0000294569050000186
wherein x is a scaling factor, and x is a constant,
Figure GPA0000294569050000187
is a cell identification number for the cell,
Figure GPA0000294569050000188
the relative subcarrier index where the first symbol group of the different repeated random access preambles resides. In the embodiment of the present application, the same scrambling code sequence may be used for random access preambles for different repeated transmissions.
In the third case: the length of the scrambling code sequence can be the same as the number of symbols in all the repetition periods of the random access lead code, and the terminal equipment can determine the scrambling code index u according to the subcarrier index where the first symbol group of the transmitted random access lead code is located, the cell ID, the length of the scrambling code sequence and the proportionality coefficient x.
In this embodiment, the length of the scrambling code sequence is set to be 20rep, where rep is the number of times of repeating the random access preamble.
In this embodiment of the present application, the subcarrier index where the first symbol group of the random access preamble that is repeatedly transmitted for the first time in the random access preamble that is repeatedly transmitted for multiple times is located may be an absolute subcarrier index within 48 subcarriers corresponding to 180kHz, or may be a relative subcarrier index, that is, may be a relative subcarrier index within 12 subcarriers corresponding to the frequency hopping range of the random access preamble.
In the embodiment of the present application, when the subcarrier index where the first symbol group of the random access preamble is located is an absolute subcarrier index, the scrambling code sequence index u may be calculated by the following formula (1.7):
Figure GPA0000294569050000191
wherein, x is a proportionality coefficient,
Figure GPA0000294569050000192
is a cell identification number for the cell,
Figure GPA0000294569050000193
the absolute subcarrier index where the first symbol group of the random access preamble code repeatedly transmitted for the first time in the random access preamble code is located is repeated for a plurality of times.
In the embodiment of the present application, when the subcarrier index where the first symbol group of the random access preamble is located is a relative subcarrier index, the scrambling code sequence index u may be calculated by the following formula (1.8):
Figure GPA0000294569050000194
wherein, x is a proportionality coefficient,
Figure GPA0000294569050000195
is a cell identification number for the cell,
Figure GPA0000294569050000196
the relative subcarrier index where the first symbol group of the random access preamble code repeatedly transmitted for the first time in the random access preamble code is located is repeated for a plurality of times.
By adopting the method in the embodiment of the application, different scrambling codes are respectively added on the random access lead codes of the target cell and the interference cell, so that the problem of false alarm of the target cell caused by interference among the cells is reduced. In addition, in both the target cell and the interference cell, the scrambling codes used on different random access preambles or different subcarriers in the same cell are different, so that the performance in the cell can be ensured.
Example two
The first parameter may include subcarrier indexes of a plurality of symbol groups of the random access preamble and the length of the scrambling sequence, and the process of step S301 (determining, by the terminal device, the scrambling sequence according to the cell identifier and the first parameter) may be as follows:
in the embodiment of the present application, it is set that the random access preamble includes Y symbol groups, which are a first symbol group, a second symbol group, and so on, until the Y-th symbol group. Correspondingly, the scrambling code sequences also comprise Y scrambling code sequences which are respectively corresponding to the first symbol group, the second symbol group and the like until the scrambling code sequence corresponding to the Y symbol group. In this embodiment of the present application, a process of determining a scrambling sequence corresponding to each symbol group may be as follows:
the terminal equipment determines a scrambling sequence index corresponding to each symbol group according to the cell identifier, the subcarrier index of each symbol group and the scrambling sequence length; and the terminal equipment determines the scrambling code sequence of each symbol group according to the scrambling code sequence index corresponding to each symbol group.
In the embodiment of the present application, the scrambling code sequence index may satisfy the following formula (1.9):
Figure GPA0000294569050000197
or ,
Figure GPA0000294569050000198
or ,
Figure GPA0000294569050000199
wherein, the
Figure GPA0000294569050000201
Represents a cell identity, said
Figure GPA0000294569050000202
A subcarrier index representing an ith symbol group in the random access preamble, the k representing the scrambling sequence length;
in the embodiment of the present application, the corresponding relationship 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 satisfies the following formula (2.0):
c(m)＝ej2umπ/k(ii) a Formula (2.0)
Wherein, the c (m) represents a scrambling code sequence, 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 index of the scrambling code sequence.
The process of the step S302 (the terminal device scrambles with the random access preamble according to the scrambling code sequence) may be as follows:
and the terminal equipment correspondingly multiplies the symbols on each symbol group of the random access lead code with the corresponding scrambling code sequence, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group where the cyclic prefix is positioned.
For the second example, the first random access preamble includes 4 symbol groups, and each symbol group includes 4 symbols and a Cyclic Prefix (CP).
In this embodiment of the present application, the length of the scrambling sequence may be the same as the number of symbols in one symbol group of the random access preamble, and the terminal device may determine the scrambling sequence index according to the subcarrier index, the cell ID, the length of the scrambling sequence, and the scaling factor where the current symbol group of the random access preamble is located, and then further determine the scrambling sequence according to the correspondence between the scrambling sequence index and the scrambling sequence. Here, the correspondence table of the scramble code sequence index and the scramble code sequence in example one may be cited.
As an example, Table 6 shows different cells (C)
Figure GPA0000294569050000203
Different) terminal device, according to the subcarrier index where the current symbol group of the transmitted random access preamble code is located
Figure GPA0000294569050000204
Cell ID, scrambling sequence length k, and scaling factor x, an example illustration of determining the scrambling sequence index. Assuming that x is 2 and cyclic shift x-1 is 1, cell id of cell a is 100 and cell id of cell B is 101.
Figure GPA0000294569050000205
TABLE 6
After the terminal device determines the scrambling sequence, different scrambling sequences may be used for different symbol groups of the transmitted random access preamble. At this time, at least two different scrambling sequences are used for the four symbol groups of different repeated random access preamble codes, i.e., the scrambling sequence used for each symbol group of each of all the repeated random access preamble codes may be different.
It should be noted that the subcarrier index where the current symbol group of the random access preamble code is located is
Figure GPA0000294569050000206
The index may be an absolute subcarrier index within 48 subcarriers corresponding to 180kHz or a relative subcarrier index, that is, a relative subcarrier index within 12 subcarriers corresponding to a hopping range of the random access preamble.
By adopting the method in the embodiment of the application, different scrambling codes are respectively added on the random access lead codes of the target cell and the interference cell, the problem of false alarm of the target cell caused by interference between the cells is reduced, and meanwhile, in the target cell or the interference cell, the used scrambling codes are different on different random access lead codes or different subcarriers in the same cell, so that the performance in the cell can be ensured.
Example three
In this embodiment of the present application, the process of step S301 (the terminal device determines the random access preamble according to the cell identifier and the first parameter) may specifically be: the terminal equipment determines a base sequence according to the cell identifier and the first parameter; and the terminal equipment determines the scrambling code sequence according to the base sequence and a preset repetition rule.
In an example of the present application, the preset repetition rule may include: repeating each element in the base sequence for M times in sequence according to the arrangement sequence of the elements in the base sequence, and determining the scrambling code sequence; or repeating the base sequence for M times to determine the scrambling code sequence, wherein M is an integer.
In the embodiment of the present application, how to determine the base sequence according to the cell identifier and the first parameter may be specifically classified into the following two cases:
in a first case, if the first parameter includes the subcarrier index of the first symbol group of the random access preamble and the scrambling sequence length, the terminal device may determine a base sequence index according to the cell identifier, the subcarrier index of the first symbol group of the random access preamble, and the scrambling sequence length; the base sequence is then determined based on the base sequence index.
In the embodiment of the application, the base sequence index can satisfy the following formula (2.1)
Figure GPA0000294569050000211
or ,
Figure GPA0000294569050000212
wherein said p represents said base sequence index, said
Figure GPA0000294569050000213
Represents a cell identity, said
Figure GPA0000294569050000214
A subcarrier index representing a first symbol group of the random access preamble, the q representing a length of the base sequence;
in the embodiment of the present application, 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, and the following formula (2.2) is satisfied:
s(d)＝ej2pdπ/q(ii) a Formula (2.2)
Wherein s (d) represents the base sequence, d has a value from 0 to q-1, q represents the length of the base sequence, and p represents the base sequence index.
The process of the step S302 (the terminal device scrambles the random access preamble according to the scrambling code sequence) may be as follows:
1) and if the length of the scrambling code sequence is the same as the sum of the cyclic prefix and the number of the symbols in one symbol group of the random access preamble code, the terminal equipment can multiply the scrambling code sequence with the cyclic prefix and the symbol contraposition on each symbol group of the random access preamble code.
2) And if the length of the scrambling code sequence is the same as the sum of the cyclic prefix and the number of the symbols in one repeating period of the random access preamble code, the terminal equipment can multiply the scrambling code sequence with the cyclic prefix and the symbol in each repeating period of the random access preamble code by a pair.
3) And if the length of the scrambling code sequence is the same as the sum of the cyclic prefix and the number of the symbols in all the repetition periods of the random access preamble code, the terminal equipment can multiply the scrambling code sequence and the cyclic prefix and the symbol in all the repetition periods of the random access preamble code by para-position.
In the second case, if the first parameter includes subcarrier indexes of a plurality of symbol groups of the random access preamble and the length of the scrambling sequence, and meanwhile, 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, until reaching the Y-th symbol group, and each symbol group corresponds to a base sequence.
The process of determining the base sequence corresponding to each symbol group by the terminal device may be as follows: the terminal equipment can determine a base sequence index of each symbol group according to the cell identifier, the subcarrier index of each symbol group and the length of the scrambling sequence; the terminal device may determine the base sequence of each symbol group based on the base sequence index of each symbol group.
In the embodiment of the present application, the base sequence index satisfies the following formula (2.3):
Figure GPA0000294569050000221
or ,
Figure GPA0000294569050000222
wherein said p represents said base sequence index, said
Figure GPA0000294569050000223
Which is representative of the identity of the cell,
Figure GPA0000294569050000224
a subcarrier index representing an ith symbol group of the random access preamble, the q representing a base sequence length;
in the embodiment of the present application, 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)＝ej2pdπ/q(ii) a Formula (2.4)
Wherein s (d) represents the base sequence, d has a value from 0 to q-1, q represents the length of the base sequence, and p represents the index of the base sequence.
In an example of the present application, it is assumed that the base sequence is denoted by index p, the base sequence is denoted by s (d), and the base sequence s (d) includes three scrambling code symbols, which are s (0), s (1), and s (2), respectively. Based on the above formula (2.2), the corresponding relationship between the base sequence index p and the base sequence s (d) can be determined. For example, the determined correspondence relationship between the base sequence index p and the base sequence s (d) can be shown in the following table 7:
Figure GPA0000294569050000225
TABLE 7
In the embodiment of the present application, as described in the background art, the random access preamble sent by the NB-IoT terminal deployed in the early stage is a full 1 sequence, and in order to avoid mutual interference with the NB-IoT terminal deployed in the early stage in the subsequent scrambling process, the corresponding base sequence when the index of the base sequence in table 7 is equal to 0 may be removed, that is, the corresponding full 1 scrambling code when the index p of the base sequence is equal to 0 is removed. Accordingly, the base sequence may be represented as s (d) ej2pdπ/3Wherein d is 0, 1,
Figure GPA0000294569050000226
is a cell identification number for the cell,
Figure GPA0000294569050000227
a subcarrier index indicating the first symbol group of the random access preamble, and at this time, a correspondence relationship between the index of the base sequence and the base sequence may be as shown in table 8.
Figure GPA0000294569050000228
TABLE 8
The process of the step S302 (the terminal device scrambles the random access preamble according to the scrambling code sequence) may be as follows: if the length of the scrambling code sequence is the same as the sum of the cyclic prefix and the number of the symbols in one symbol group of the random access preamble code, the terminal equipment can multiply the scrambling code sequence of the ith symbol group of the random access preamble code by the cyclic prefix and the symbols on the ith symbol group correspondingly, and the value of i is sequentially taken from 1 to Y.
For the third example, the first random access preamble includes 4 symbol groups, and each symbol group includes 4 symbols and a Cyclic Prefix (CP).
The method for acquiring the scrambling code sequence by the terminal equipment can also be that the terminal equipment acquires the scrambling code sequence based on the base sequence. The terminal device may first obtain the base sequence, and then the terminal device may obtain the scrambling sequence according to the base sequence and a preset repetition rule. Specifically, the method includes that the terminal equipment generates a base sequence, and the terminal equipment obtains a scrambling code sequence according to the base sequence and a preset repetition rule; or, the terminal device obtains the base sequence according to the corresponding relation between the index of the base sequence and the base sequence, and obtains the scrambling code sequence according to the base sequence and a preset repetition rule. And the terminal equipment repeatedly processes at least one element in the base sequence according to a preset repetition rule to obtain a scrambling code sequence. For example, the preset repetition rule is that each element in the base sequence is repeated M times in sequence to obtain the scrambling code sequence.
In this embodiment, the length of the scrambling sequence may be the same as the number of CP plus symbols in one symbol group of the random access preamble, that is, the length of the scrambling sequence is 6, at this time, the length of the base sequence is 3, and the base sequence with the length of 3 may be obtained according to formula (2.1) or formula (2.3).
In this embodiment, the length of the scrambling sequence may be the same as the CP plus the number of symbols in one repetition period of the random access preamble, that is, the length of the scrambling sequence is 24, at this time, the length of the base sequence is 12, and the base sequence with the length of 12 may be obtained according to formula (2.1) or formula (2.3).
In this embodiment, the length of the scrambling code sequence may be the same as 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 24rep, at this time, the length of the base sequence is 12rep, and the base sequence with the length of 12rep may be obtained according to formula (2.1) or formula (2.3).
In the embodiment of the present application, when scrambling the random access preamble by using the scrambling sequence belongs to symbol-level scrambling, and when the length of the scrambling code is 5, the terminal device multiplies the scrambling sequence by a symbol bit on each symbol group of the random access preamble, 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 where the cyclic prefix is located. And when the length of the scrambling code obtained through the base sequence is 6, the terminal equipment carries out counterpoint multiplication on each scrambling code in the scrambling code sequence and the CP of the symbol group in the random access lead code and each symbol.
Optionally, in this embodiment of the present application, the scrambling code sequence may also be an orthogonal sequence, a ZC sequence, a pseudorandom sequence, a differential orthogonal sequence, or a sequence obtained by differentiating the scrambling codes applied to the symbol group in each repetition period is orthogonal, or a subset of the sequence obtained by differentiating the scrambling codes applied to the symbol group in each repetition period is orthogonal.
Optionally, in this embodiment of the present application, when the scrambling code sequence or the base sequence acquired by the terminal device is a pseudo-random sequence, the specific implementation manner of acquiring the scrambling code sequence or the base sequence by the terminal device generates the 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 hyper 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, a Gold sequence, or the like. The initialization seed of the pseudo random sequence can be a function of cell identification, hyper frame number, symbol index, symbol group index, repetition number, subcarrier index, carrier index and the like, or the initialization seed of the pseudo random sequence can be a function of a combination of parts of the cell identification, hyper frame number, symbol index, symbol group index, repetition number, subcarrier index, carrier index and the like.
Optionally, in this embodiment of the present application, the scrambling code sequence generated by the terminal device may also be obtained by using a ZC sequence or cyclic extension of the ZC sequence. Correspondingly, the base sequence generated by the terminal device may also be obtained using a ZC sequence or cyclic spreading of a ZC sequence.
Optionally, length NZCCan be represented by the following formula (2.5):
Figure GPA0000294569050000241
wherein ,
Figure GPA0000294569050000242
q is an integer, such as q-0,
Figure GPA0000294569050000243
for the initialization seed of ZC sequence, when the length of the scrambling sequence or the base sequence generated by the terminal equipment is NSLength N of time, ZC sequenceZCShould be selected to be less than or equal to NSThe scrambling code sequence or the base sequence generated by the terminal device can be represented by the following formula (2.6):
Figure GPA0000294569050000244
wherein ,
Figure GPA0000294569050000245
the initialization seed of the ZC sequence or the cyclic shift of the ZC sequence is related to a cell identity.
Optionally, the scrambling code sequence or the base sequence acquired by the terminal device may further satisfy the following condition: the scrambling code sequences or base sequences corresponding to different scrambling code sequences or base sequence indexes are orthogonal after difference, or the scrambling code sequences or base sequences corresponding to different scrambling code sequences or base sequence indexes are orthogonal after difference, and sequence subsets are obtained.
For any optional scrambling code sequence determination manner above, any one of the scrambling code sequence indexes in the first example, the second example, or the third example may be used, that is, a certain one of the scrambling code sequence indexes in the first example, the second example, or the third example may be used to determine a scrambling code sequence index, and a scrambling code sequence corresponding to the determined scrambling code sequence index may be any one of the scrambling code sequences in this example, such as: orthogonal sequence, ZC sequence, pseudo-random sequence, differential orthogonal sequence, or sequence orthogonal obtained by the difference of scrambling codes added to symbol groups in each repetition period, or sequence subset orthogonal obtained by the difference of scrambling codes added to symbol groups in each repetition period, etc.
In the embodiment of the present application, by using the methods disclosed in the above example one, example two, and example three, synchronous orthogonality or cyclic shift orthogonality of different scrambling code sequences can be achieved.
Assume that there are k symbols in the symbol group of the random access preamble, the scrambling code added to the symbol group of cell a is a (0), a (1),.. multidot.a (k-1), and the scrambling code added to the symbol group of cell B is B (0), B (1),. multidot.b (k-1). Since the two cells are not necessarily synchronized in time, the scrambling codes satisfy synchronization orthogonality, and are also orthogonal under cyclic shift. That is, the scrambling code sequence satisfies the condition that the scrambling code sequences of cell a and cell B need to satisfy synchronization orthogonality or cyclic shift orthogonality.
a(0)*b(0)+a(1)*b(1)+...a(k-1)*b(k-1)＝0；
a(0)*b(1)+a(1)*b(2)+...+a(k-1)*b(k-2)＝0；
Therefore, in the embodiment of the application, the scrambling code sequences are adopted, so that not only can synchronous orthogonality among different scrambling code sequences be ensured, but also cyclic moving orthogonality of different scrambling code sequences can be ensured.
Similar to the above concept, as shown in fig. 9, the present application provides a random access preamble transmission apparatus 900, which includes a processing unit 901 and a transceiver unit 902.
In an example of the present application, the apparatus 900 for transmitting 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 determine a scrambling sequence according to a cell identifier and a first parameter, and scramble the random access preamble according to the scrambling sequence. The transceiving unit 902 may be configured to transmit the scrambled random access preamble.
In another example of the present application, the apparatus 900 for transmitting the random access preamble can be applied to a network device, and the transceiver 902 can be configured to receive the scrambled random access preamble. The processing unit 901 may be configured to determine a scrambling code sequence according to the cell identifier and the first parameter, and descramble the scrambled random access preamble according to the scrambling code sequence to obtain the descrambled random access preamble. For applications of the processing unit 901 and the transceiver unit 902 on the terminal device side and the network device side, reference may be specifically made to the description of the flow described in fig. 3, which is not described again.
Similar to the above concept, as shown in fig. 10, the present application provides an apparatus 1000 for transmitting a general access preamble, where the apparatus 1000 may be a network device or a chip applied to the network device, and the apparatus 1000 may be a terminal device or a chip applied to the terminal device.
The apparatus 1000 may include a processor 1010 and a memory 1020. Further, the apparatus 1000 may also include a receiver 1040 and a transmitter 1050. Still further, the apparatus may also include a bus system 1030.
The processor 1010, the memory 1020, the receiver 1040, and the transmitter 1050 may be connected through the bus system 1030, the memory 1020 is configured to store instructions, and the processor 1010 is configured to execute the instructions stored in the memory 1020 to control the receiver 1040 to receive signals and control the transmitter 1050 to transmit signals, so as to complete the steps on the network device side or the terminal device side in the flow illustrated in fig. 3.
Wherein the receiver 1040 and the transmitter 1050 may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver. The memory 1020 may be integrated with the processor 1010 or may be separate from the processor 1010.
As an implementation manner, the functions of the receiver 1040 and the transmitter 1050 may be realized by a transceiving circuit or a dedicated chip for transceiving. Processor 1010 may be considered to be implemented by a dedicated processing chip, processing circuit, processor, or a general-purpose chip.
As another implementation manner, the radio access network device provided in the embodiment of the present invention may be implemented by using a general-purpose computer. I.e., program code that implements the functions of the processor 1010, the receiver 1040, and the transmitter 1050, is stored in the memory, and a general-purpose processor implements the functions of the processor 1010, the receiver 1040, and the transmitter 1050 by executing the code in the memory.
For the concepts, explanations, details and other steps related to the technical solutions provided by the embodiments of the present invention related to the apparatus, reference is made to the foregoing methods or descriptions related to these contents in other embodiments, which are not described herein again.
In an example of the present application, the apparatus 1010 may be applied to a terminal device, the processor 1010 may determine a scrambling sequence according to a cell identifier and a first parameter, and then scramble a random access preamble according to the scrambling sequence, and the transmitter 1050 may transmit the scrambled random access preamble.
In another example of the present application, when the apparatus 1000 is applied to a network device side, the receiver 1040 may receive a scrambled random access preamble, and the processor 1010 may determine a scrambling sequence according to the first parameter and the cell identifier, descramble the scrambled random access preamble according to the scrambling sequence, and determine the descrambled random access preamble.
According to the method provided by the embodiment of the present application, an embodiment of the present invention further provides a communication system, which includes the terminal device and the network device.
Based on the above embodiments, the present application further provides a computer storage medium, in which a software program is stored, and the software program can implement the method provided by any one or more of the above embodiments when being read and executed by one or more processors. The computer storage medium may include: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.
Based on the above embodiments, the present application further provides a chip, where the chip includes a processor, and is configured to implement the functions related to any one or more of the above embodiments, such as obtaining or processing information or messages related to the above methods. Optionally, the chip further comprises a memory for the processor to execute the necessary program instructions and data. The chip may be constituted by a chip, or may include a chip and other discrete devices.
It should be understood that in embodiments of the present invention, the processor may be a Central Processing Unit (CPU), and the processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory.
The bus system may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus. For clarity of illustration, however, the various buses are labeled as a bus system in the figures.
The processor in the embodiments 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 transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software elements in a processor. Program code executed by a processor to implement the above-described methods may be stored in a memory. The memory is coupled to the processor. The processor may cooperate with the memory. The memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory, such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may 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, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications can be made in the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims (35)

1. A method for transmitting a random access preamble, comprising:
the terminal equipment determines a scrambling code sequence according to the cell identifier and the first parameter;
the terminal equipment scrambles the random access lead code according to the scrambling code sequence;
the terminal equipment sends the scrambled random access lead code;
wherein the first parameter comprises one or more of:
a subcarrier index of a first symbol group of the random access preamble, subcarrier indexes of a plurality of symbol groups of the random access preamble, the scrambling sequence length, 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 transmission time of the random access preamble.
2. The method of claim 1, wherein when the first parameter comprises a subcarrier index of a first symbol group of the random access preamble and the scrambling sequence length, the terminal device determines a scrambling sequence according to a cell identifier and the first parameter, and comprises:
the terminal equipment determines a scrambling code sequence index according to a cell identifier, a subcarrier index of a first symbol group of the random access preamble code and the scrambling code sequence length;
and the terminal equipment determines the scrambling code sequence according to the scrambling code sequence index.
3. The method of claim 2, wherein the scrambling sequence index satisfies the following formula:
Figure FDA0003460518110000011
or ,
Figure FDA0003460518110000012
wherein the u represents the scrambling code sequence index, the
Figure FDA0003460518110000013
Represents the cell identity, the
Figure FDA0003460518110000014
A subcarrier index representing a first symbol group of the random access preamble, wherein k represents a scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents the scrambling code sequence, 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.
4. The method according to any one of claims 1 to 3, wherein the length of the scrambling sequence is the same as the number of symbols in a symbol group of the random access preamble code, and the terminal device scrambles the random access preamble code according to the scrambling sequence, comprising:
and the terminal equipment multiplies the scrambling code sequence by a symbol bit on each symbol group of the random access preamble code, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group where the cyclic prefix is positioned.
5. The method according to any of claims 1 to 3, wherein the length of the scrambling sequence is the same as the number of symbols in one repetition period of the random access preamble code, and the terminal device scrambles the random access preamble code according to the scrambling sequence, comprising:
and the terminal equipment multiplies the scrambling code sequence by a symbol bit in each repetition period of the random access preamble code, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group in which the cyclic prefix is positioned.
6. The method according to any of claims 1 to 3, wherein the length of the scrambling sequence is the same as the number of symbols in all repetition periods of the random access preamble code, and the terminal device scrambles the random access preamble code according to the scrambling sequence, comprising:
and the terminal equipment multiplies the scrambling code sequence by the symbol in all the repetition periods of the random access preamble code, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group in which the cyclic prefix is positioned.
7. The method according to any one of claims 1 to 3, wherein the length of the scrambling sequence is the same as the number of symbol groups in one repetition period of the random access preamble code, and the terminal device scrambles the random access preamble code according to the scrambling sequence, comprising:
and the terminal equipment multiplies the scrambling code sequence by a symbol group in each repetition period of the random access lead code, and each symbol in each symbol group is the same as the scrambling code of the cyclic prefix.
8. The method according to any one of claims 1 to 3, wherein the length of the scrambling sequence 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 sequence, including:
and the terminal equipment multiplies the scrambling code sequence by symbol groups in all the repetition periods of the random access lead code, and the scrambling codes of all symbols in each symbol group and the cyclic prefix are the same.
9. The method of claim 1, wherein when the first parameter comprises subcarrier indexes of a plurality of symbol groups of the random access preamble and the scrambling sequence length, the terminal device determines a scrambling sequence according to a cell identifier and the first parameter, and comprises:
the terminal equipment determines the scrambling code sequence index of each symbol group according to the cell identification, the subcarrier index of each symbol group and the scrambling code sequence length;
and the terminal equipment determines the scrambling code sequence of each symbol group according to the scrambling code sequence index of each symbol group.
10. The method of claim 9, wherein the scrambling sequence index satisfies the following formula:
Figure FDA0003460518110000021
or ,
Figure FDA0003460518110000022
wherein, the
Figure FDA0003460518110000023
Represents a cell identity, said
Figure FDA0003460518110000024
A subcarrier index representing an ith symbol group in the random access preamble, the k representing the scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents a scrambling code sequence, 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 index of the scrambling code sequence.
11. The method according to claim 9 or 10, wherein the length of the scrambling sequence is the same as the number of symbols in a symbol group of the random access preamble code, and the terminal device scrambles the random access preamble code according to the scrambling sequence, comprising:
and the terminal equipment correspondingly multiplies the symbols on each symbol group of the random access lead code with the corresponding scrambling code sequence, and the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group where the cyclic prefix is positioned.
12. A method for transmitting a random access preamble, comprising:
the network equipment receives the scrambled random access lead code;
the network equipment determines a scrambling code sequence according to the cell identification and the first parameter;
the network equipment descrambles the scrambled random access lead code according to the scrambling code sequence;
wherein the first parameter comprises one or more of:
a subcarrier index of a first symbol group of the random access preamble, subcarrier indexes of a plurality of symbol groups of the random access preamble, the scrambling sequence length, 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 transmission time of the random access preamble.
13. The method of claim 12, wherein when the first parameter comprises a subcarrier index of a first symbol group of the random access preamble and the scrambling sequence length, the network device determines a scrambling sequence according to a cell identifier and the first parameter, comprising:
the network equipment determines a scrambling code sequence index according to a cell identifier, a subcarrier index of a first symbol group of the random access preamble code and the scrambling code sequence length;
and the network equipment determines the scrambling code sequence according to the scrambling code sequence index.
14. The method of claim 13, wherein the scrambling sequence index satisfies the following formula:
Figure FDA0003460518110000031
or ,
Figure FDA0003460518110000032
wherein the u represents the scrambling code sequence index, the
Figure FDA0003460518110000033
Represents the cell identity, the
Figure FDA0003460518110000034
A subcarrier index representing a first symbol group of the random access preamble, wherein k represents a scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents the scrambling code sequence, 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.
15. The method of claim 12, wherein when the first parameter comprises subcarrier indexes of a plurality of symbol groups of the random access preamble and the scrambling sequence length, the network device determines a scrambling sequence according to a cell identifier and the first parameter, comprising:
the network equipment determines the scrambling code sequence index of each symbol group according to the cell identification, the subcarrier index of each symbol group and the scrambling code sequence length;
and the network equipment determines the scrambling code sequence of each symbol group according to the scrambling code sequence index of each symbol group.
16. The method of claim 15, wherein the scrambling sequence index satisfies the following formula:
Figure FDA0003460518110000035
or ,
Figure FDA0003460518110000036
wherein, the
Figure FDA0003460518110000037
Represents a cell identity, said
Figure FDA0003460518110000038
A subcarrier index representing an ith symbol group in the random access preamble, the k representing the scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents a scrambling code sequence, 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 index of the scrambling code sequence.
17. An apparatus for transmitting a random access preamble, the apparatus comprising:
the processing unit is used for determining a scrambling code sequence according to the cell identifier and the first parameter and scrambling the random access lead code according to the scrambling code sequence;
a receiving and sending unit, configured to send the scrambled random access preamble;
wherein the first parameter comprises one or more of:
a subcarrier index of a first symbol group of the random access preamble, subcarrier indexes of a plurality of symbol groups of the random access preamble, the scrambling sequence length, 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 transmission time of the random access preamble.
18. The apparatus of claim 17, wherein when the first parameter comprises a subcarrier index of a first symbol group of the random access preamble and the scrambling sequence length, the processing unit is specifically configured to, when determining a scrambling sequence according to a cell identifier and the first parameter:
determining a scrambling code sequence index according to the cell identification, the subcarrier index of the first symbol group of the random access preamble code and the scrambling code sequence length;
and determining the scrambling code sequence according to the scrambling code sequence index.
19. The apparatus of claim 18, wherein the scrambling sequence index satisfies the following equation:
Figure FDA0003460518110000041
or ,
Figure FDA0003460518110000042
wherein the u represents the scrambling code sequence index, the
Figure FDA0003460518110000043
Represents the cell identity, the
Figure FDA0003460518110000044
A subcarrier index representing a first symbol group of the random access preamble, wherein k represents a scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents the scrambling code sequence, 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.
20. The apparatus according to any of claims 17 to 19, wherein the length of the scrambling sequence is the same as the number of symbols in a symbol group of the random access preamble, and the processing unit, when scrambling the random access preamble according to the scrambling sequence, is specifically configured to:
and multiplying the scrambling code sequence by the symbol alignment position on each symbol group of the random access preamble code, wherein 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 where the cyclic prefix is positioned.
21. The apparatus according to any of claims 17 to 19, wherein the length of the scrambling sequence is the same as the number of symbols in one repetition period of the random access preamble code, and the processing unit, when scrambling the random access preamble code according to the scrambling sequence, is specifically configured to:
and multiplying the scrambling code sequence by the symbol alignment in each repetition period of the random access preamble code, wherein the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group in which the cyclic prefix is positioned.
22. The apparatus according to any of claims 17 to 19, wherein the length of the scrambling sequence is the same as the number of symbols in all repetition periods of the random access preamble code, and the processing unit, when scrambling the random access preamble code according to the scrambling sequence, is specifically configured to:
and multiplying the scrambling code sequence by the symbol alignment in all the repetition periods of the random access preamble code, wherein the scrambling code of the cyclic prefix in each symbol group is the same as that of the last symbol in the symbol group in which the cyclic prefix is positioned.
23. The apparatus according to any of claims 17 to 19, wherein the length of the scrambling sequence is the same as the number of symbol groups in one repetition period of the random access preamble code, and the processing unit, when scrambling the random access preamble code according to the scrambling sequence, is specifically configured to:
and multiplying the scrambling code sequence by a symbol group in each repetition period of the random access preamble code, wherein each symbol in each symbol group is the same as the scrambling code of the cyclic prefix.
24. The apparatus according to any of claims 17 to 19, wherein the length of the scrambling sequence is the same as the number of symbol groups in all repetition periods of the random access preamble, and the processing unit, when scrambling the random access preamble according to the scrambling sequence, is specifically configured to:
and multiplying the scrambling code sequence by symbol group bits in all repetition periods of the random access preamble code, wherein each symbol in each symbol group is the same as the scrambling code of the cyclic prefix.
25. The apparatus of claim 17, wherein when the first parameter comprises subcarrier indexes of a plurality of symbol groups of the random access preamble and the scrambling sequence length, the processing unit is specifically configured to, when determining a scrambling sequence according to a cell identifier and the first parameter:
determining a scrambling code sequence index of each symbol group according to the cell identification, the subcarrier index of each symbol group and the length of the scrambling code sequence;
and determining the scrambling code sequence of each symbol group according to the scrambling code sequence index of each symbol group.
26. The apparatus of claim 25, wherein the scrambling sequence index satisfies the following equation:
Figure FDA0003460518110000051
or ,
Figure FDA0003460518110000052
wherein, the
Figure FDA0003460518110000053
Represents a cell identity, said
Figure FDA0003460518110000054
A subcarrier index representing an ith symbol group in the random access preamble, the k representing the scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents a scrambling code sequence, 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 index of the scrambling code sequence.
27. The apparatus of claim 25 or 26, wherein the length of the scrambling sequence is the same as the number of symbols in a symbol group of the random access preamble, and wherein the processor, when scrambling the random access preamble according to the scrambling sequence, is specifically configured to:
and correspondingly multiplying the symbols on each symbol group of the random access preamble code with a corresponding scrambling code sequence, wherein 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 where the cyclic prefix is located.
28. An apparatus for transmitting a random access preamble, the apparatus comprising:
a receiving and sending unit, configured to receive the scrambled random access preamble;
the processing unit is used for determining a scrambling code sequence according to the cell identifier and the first parameter and descrambling the scrambled random access lead code according to the scrambling code sequence;
wherein the first parameter comprises one or more of:
a subcarrier index of a first symbol group of the random access preamble, subcarrier indexes of a plurality of symbol groups of the random access preamble, the scrambling sequence length, 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 transmission time of the random access preamble.
29. The apparatus of claim 28, wherein when the first parameter comprises a subcarrier index of a first symbol group of the random access preamble and the scrambling sequence length, the processing unit is specifically configured to, when determining a scrambling sequence according to a cell identifier and the first parameter:
determining a scrambling code sequence index according to the cell identification, the subcarrier index of the first symbol group of the random access preamble code and the scrambling code sequence length;
and determining the scrambling code sequence according to the scrambling code sequence index.
30. The apparatus of claim 29, wherein the scrambling sequence index satisfies the following equation:
Figure FDA0003460518110000055
or ,
Figure FDA0003460518110000056
wherein the u represents the scrambling code sequence index, the
Figure FDA0003460518110000057
Represents the cell identity, the
Figure FDA0003460518110000058
A subcarrier index representing a first symbol group of the random access preamble, wherein k represents a scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents the scrambling code sequence, 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.
31. The apparatus of claim 28, wherein when the first parameter comprises subcarrier indices of a plurality of symbol groups of the random access preamble and the scrambling sequence length, the processor is specifically configured to, when determining a scrambling sequence based on a cell identity and the first parameter:
determining the scrambling code sequence index of each symbol group according to the cell identification, the subcarrier index of each symbol group and the length of the scrambling code sequence;
and determining the scrambling code sequence of each symbol group according to the scrambling code sequence index of each symbol group.
32. The apparatus of claim 31, wherein the scrambling sequence index satisfies the following equation:
Figure FDA0003460518110000061
or ,
Figure FDA0003460518110000062
wherein, the
Figure FDA0003460518110000063
Represents a cell identity, said
Figure FDA0003460518110000064
A subcarrier index representing an ith symbol group in the random access preamble, the k representing the scrambling sequence length;
the scrambling code sequence satisfies the following formula:
c(m)＝ej2umπ/k；
wherein, the c (m) represents a scrambling code sequence, 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 index of the scrambling code sequence.
33. An apparatus for transmitting a random access preamble, comprising a processor and a memory;
wherein the memory is used for storing computer execution instructions;
the processor is configured to execute computer-executable instructions stored by the memory to cause a transmitting device of the random access preamble to perform the method of any of claims 1 to 16.
34. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 16.
35. A communication system, characterized in that it comprises means for transmitting a random access preamble according to any of claims 17 to 27 and means for transmitting a random access preamble according to any of claims 28 to 32.
CN201880092067.9A 2018-05-11 2018-05-11 Method and device for transmitting random access lead code Active CN111937477B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/086613 WO2019213972A1 (en) 2018-05-11 2018-05-11 Method and apparatus for transmitting random access preamble

Publications (2)

Publication Number Publication Date
CN111937477A CN111937477A (en) 2020-11-13
CN111937477B true CN111937477B (en) 2022-05-13

Family

ID=68466644

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201880092067.9A Active CN111937477B (en) 2018-05-11 2018-05-11 Method and device for transmitting random access lead code

Country Status (2)

Country Link
CN (1) CN111937477B (en)
WO (1) WO2019213972A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114079552B (en) * 2020-08-18 2023-03-31 中国移动通信有限公司研究院 Method, device, terminal and equipment for generating random access leader sequence

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102325382A (en) * 2011-06-30 2012-01-18 电信科学技术研究院 Random access method and equipment
CN106937400A (en) * 2015-12-29 2017-07-07 中国移动通信集团江苏有限公司 A kind of accidental access method, base station and user equipment
CN107223361A (en) * 2017-05-05 2017-09-29 北京小米移动软件有限公司 Control method, user equipment and the base station of Network with Random Multiple Access System

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070211671A1 (en) * 2006-03-09 2007-09-13 Interdigital Technology Corporation Method and apparatus for a flexible preamble and efficient transmission thereof
US9516541B2 (en) * 2013-09-17 2016-12-06 Intel IP Corporation Congestion measurement and reporting for real-time delay-sensitive applications
CN105451363B (en) * 2014-09-22 2018-09-21 普天信息技术有限公司 The method of random access, base station and user equipment in narrowband systems
NZ740945A (en) * 2015-09-28 2019-11-29 Ericsson Telefon Ab L M Random access preamble for minimizing pa backoff

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102325382A (en) * 2011-06-30 2012-01-18 电信科学技术研究院 Random access method and equipment
CN106937400A (en) * 2015-12-29 2017-07-07 中国移动通信集团江苏有限公司 A kind of accidental access method, base station and user equipment
CN107223361A (en) * 2017-05-05 2017-09-29 北京小米移动软件有限公司 Control method, user equipment and the base station of Network with Random Multiple Access System

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NPRACH enhancement in NB-IoT;LG Electronics;《3GPP TSG-RAN WG1 #88bis R1-1704850》;20170305;正文的第1节-第3节 *

Also Published As

Publication number Publication date
CN111937477A (en) 2020-11-13
WO2019213972A1 (en) 2019-11-14

Similar Documents

Publication Publication Date Title
RU2696561C1 (en) Frequency hopping for random access
CN108809587B (en) Method for determining reference signal sequence, terminal equipment and network equipment
JP5213920B2 (en) Base station apparatus and reception method
CN110431818B (en) Method and equipment for transmitting uplink demodulation reference signal
CN106063355B (en) Method and device for transmitting message
CN108023698B (en) Method and device for configuring reference signal
CN110741715B (en) Random access preamble transmission method and device
CN108307419B (en) Authorization-free transmission method, terminal equipment and network equipment
KR101994424B1 (en) Method for transmitting and receiving synchronous signals in a wireless communication system and apparatus therefor
EP3736992B1 (en) Communication method, communication device, and network device
CN107409028A (en) Launch equipment, receiving device and its method
CN107683624B (en) Method, base station and terminal for indicating resources
CN108886505B (en) Method for sending signal, terminal equipment and network equipment
KR20180050711A (en) Method and device for transmitting a narrowband orthogonal frequency division multiplexing signal
CN111937477B (en) Method and device for transmitting random access lead code
CN112136300B (en) Communication method, communication device and network device
US10524249B2 (en) Data transmission method and apparatus
CN108282439B (en) Signal sending and receiving method and device
US10097326B2 (en) Communication method for MBMS and apparatus using same
CN116391337A (en) Signal sending and signal detecting method and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant