WO2019029728A1

WO2019029728A1 - Communication method, apparatus and system

Info

Publication number: WO2019029728A1
Application number: PCT/CN2018/100072
Authority: WO
Inventors: 李新县; 唐浩; 唐臻飞; 李俊超
Original assignee: 华为技术有限公司
Priority date: 2017-08-11
Filing date: 2018-08-10
Publication date: 2019-02-14

Abstract

A communication method, apparatus and system provided in embodiments of the present application, for use in determining a physical resource block (PRB) grid when a center frequency of a synchronization signal (SS) is consistent with a center frequency of a carrier, so as to correctly receive or transmit data. The method comprises: a terminal receives an SS from a network device; the terminal determines a first PRB grid according to the SS; the terminal receives first indication information from the network device, the first indication information being used for indicating a first frequency offset between the first PRB grid and a second PRB grid; and the terminal determines the second PRB grid according to the first PRB grid and the first frequency offset.

Description

Communication method, device and system

Technical field

The embodiments of the present application relate to the field of communications technologies, and in particular, to a communication method, apparatus, and system.

Background technique

In the wireless communication technology, after the terminal is powered on, the cell accesses the wireless network through cell search, system information reception, and random access process, thereby obtaining the service of the wireless network. During the cell search process, the terminal detects a synchronization signal (SS), determines a cell in which the terminal camps according to the SS, and obtains downlink synchronization with the cell.

The detection of the SS by the terminal is performed with a channel raster of a granularity of 100 kHz for all bands, that is, the carrier center frequency is an integer multiple of 100 kHz. The SS includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). In the frequency domain, the PSS and the SSS are mapped to six physical resource blocks (PRBs) in the middle of the carrier (ie, the entire system bandwidth), that is, 72 subcarriers in the middle of the carrier. Since no downlink synchronization is obtained with the cell at this time, in order to prevent interference, 62 subcarriers actually mapped to the middle of the carrier are protected by 5 subcarriers on each side. It can be seen that the SS is located at the center of the carrier, that is, the center frequency of the SS is consistent (or the same) with the center frequency of the carrier. Therefore, after detecting the SS, the terminal can know the center frequency of the carrier.

After the cell search, the terminal and the cell obtain downlink synchronization, and can receive downlink information sent by the network device through the cell. For example, a network device broadcasts a bandwidth (or system bandwidth) information of a carrier on a physical broadcast channel (PBCH). The terminal receives the bandwidth information of the carrier, and determines the carrier bandwidth according to the bandwidth information of the carrier. In this way, the terminal can obtain the center frequency of the carrier after detecting the SS, and obtain the carrier bandwidth after searching the PBCH, and then determine the grid of the physical resource block (PRB) of the carrier according to the center frequency of the carrier and the carrier bandwidth ( Grid).

With the development of communication technology, the center frequency of the SS is no longer consistent with the center frequency of the carrier. The existing method of determining the PRB grid may lead to resource interpretation errors and the problem of incorrect reception or transmission of data, resulting in communication quality. decline.

Summary of the invention

Embodiments of the present application provide a communication method, apparatus, and system, in order to determine a physical resource block (PRB) grid when a center frequency of a synchronization signal (SS) does not coincide with a center frequency of a carrier, thereby correctly receiving or transmitting data.

The first aspect provides a communication method, including: receiving, by a terminal, an SS from a network device; determining, by the terminal, the first PRB grid according to the SS; the terminal receiving, by the network device, first indication information, where the first indication information is used to indicate a first frequency offset between a PRB grid and a second PRB grid; the terminal determines a second PRB grid based on the first PRB grid and the first frequency offset.

The second aspect provides a communication method, including: the network device sends an SS to the terminal according to the first PRB grid; the network device sends the first indication information to the terminal, where the first indication information is used to indicate the first PRB grid and the first a first frequency offset between the two PRB grids; the network device performs information transmission with the terminal according to the second PRB grid.

In a third aspect, a communication apparatus is provided for a terminal, comprising: means or means for performing the steps of the first aspect above.

In a fourth aspect, a communication apparatus is provided for a network device, comprising: means or means for performing the steps of the second aspect above.

In a fifth aspect, a communication apparatus is provided, comprising at least one processing element and at least one storage element, wherein the at least one storage element is for storing a program and data, and when the apparatus is used for a terminal, the at least one processing element is used The method of the first aspect of the present application is performed; when the apparatus is for a network device, the at least one processing element is operative to perform the method provided by the second aspect of the present application.

In a sixth aspect, there is provided a communication device comprising at least one processing element (or chip) for performing the method of the above first or second aspect.

In a seventh aspect, a program is provided for performing the method of the first aspect or the second aspect above when executed by a processor.

In an eighth aspect, a program product, such as a computer readable storage medium, comprising the program of the seventh aspect is provided.

In the above aspects, the network device indicates, to the terminal, a frequency offset between the PRB grid corresponding to the SS and the PRB grid corresponding to the data/control channel, so that the terminal may detect the SS according to the PRB grid corresponding to the SS and The frequency offset determines the PRB grid corresponding to the data/control channel. In this way, the correct transmission and reception of data/control information can be performed on the data/control channel.

In one implementation, the subcarrier spacing of the second PRB grid is the same as the subcarrier spacing of the SS.

In an implementation, the network device sends the first indication information through a physical broadcast channel (PBCH), and the terminal receives the first indication information by using the PBCH.

In an implementation, the first indication information is used to indicate a frequency offset value, where an offset direction of the first PRB grid relative to the second PRB grid is predefined or indicated by the second indication information; or, the first The indication information is used to indicate the frequency offset value and the offset direction of the first PRB grid relative to the second PRB grid.

In an implementation, there may be multiple subcarrier spacings on the carrier for the data/control channel transmission. To determine the PRB grid corresponding to the different subcarrier spacings, the method may further include: the third indication information of the network device to the terminal, where The third indication information is used to indicate a second frequency offset between the second PRB grid and the third PRB grid, where a subcarrier spacing of the third PRB grid is greater than a subcarrier spacing of the SS; the terminal receives the third indication Information, and determining a third PRB grid based on the second PRB grid and the second frequency offset.

In one implementation, the network device sends the third indication information through the PBCH, or sends the third indication information through the remaining minimum system information RMSI; or sends the third indication information through a Radio Resource Control (RRC) message. Correspondingly, the terminal receives the third indication information by using a PBCH, an RMSI or an RRC message.

In this way, when the carrier supports multiple subcarrier spacings, when detecting the SS, the terminal may determine the PRB grid for the SS according to the SS. When the subcarrier spacing of the SS and the subcarrier spacing of the data/control information are the same, the network device The PRB grid for the data/control information may be determined according to the first indication information; when the subcarrier spacing of the SS and the subcarrier spacing of the data/control information are different, the terminal may be the same as the subcarrier spacing of the SS according to the second indication information. The PRB grid corresponding to the subcarrier spacing determines the PRB grid for the data/control information, and thus, the correct transmission of data/control information on carriers supporting multiple subcarrier spacings can be achieved.

DRAWINGS

FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

2 is a schematic diagram of a terminal initially accessing a wireless network according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a frequency domain of an SS, a PBCH, and an SS block in which an SS and a PBCH are located according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a frequency domain of an SS according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an SS grid and a PRB grid according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a communication method according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a first PRB grid and a second PRB grid according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a first PRB grid and a second PRB grid in another case according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of another communication method according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of still another communication method according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a PRB grid corresponding to multiple subcarrier spacings according to an embodiment of the present disclosure;

FIG. 12 is a schematic diagram of another communication method according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of another communication method according to an embodiment of the present disclosure;

FIG. 14 is a schematic diagram of a PRB grid according to an embodiment of the present application;

FIG. 15 is a schematic diagram of an initial access network of a terminal according to an embodiment of the present disclosure;

FIG. 16 is a schematic diagram of transmitting different SSs on a broadband carrier according to an embodiment of the present application;

FIG. 17 is a schematic diagram of different terminals accessing the same carrier through different SSs according to an embodiment of the present disclosure;

FIG. 18 is a schematic diagram of still another communication method according to an embodiment of the present application;

FIG. 19 is a schematic diagram of different terminals accessing the same carrier through different SSs according to an embodiment of the present disclosure;

FIG. 20 is a schematic diagram of another communication method according to an embodiment of the present disclosure;

FIG. 21 is a schematic diagram of another communication method according to an embodiment of the present application;

FIG. 22 is a schematic structural diagram of a network device according to an embodiment of the present disclosure;

FIG. 23 is a schematic structural diagram of a terminal according to an embodiment of the present application.

FIG. 24 is a schematic diagram of still another communication method according to an embodiment of the present application.

FIG. 25 is a schematic diagram of a PRB grid according to an embodiment of the present application.

FIG. 26 is a schematic diagram of another PRB grid according to an embodiment of the present application.

Detailed ways

Hereinafter, some of the terms in the embodiments of the present application will be described so as to be understood by those skilled in the art.

1) A terminal, also called a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc., is a device that provides voice/data connectivity to users. For example, a handheld device having a wireless connection function, an in-vehicle device, or the like. Currently, some examples of terminals are: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality. (augmented reality, AR) equipment, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, smart grid Wireless terminals, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and the like.

2) The network device is a device that provides wireless services for the terminal, and includes, for example, a radio access network (RAN) node (or device). A RAN node (or device) is a node (or device) in a network that connects a terminal to a wireless network. Currently, some examples of RAN nodes are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), and Node B (Node). B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit , BBU), or Wifi access point (AP), etc. In addition, in a network structure, the RAN includes a centralized unit (CU) node or a distributed unit (DU) node, in which the functional division on the RAN side is implemented in the CU and the DU, and A plurality of DUs are centrally controlled by one CU. At this time, the RAN node may be a CU node/DU node. The functions of the CU and the DU may be divided according to the protocol layer of the wireless network. For example, the function of the packet data convergence protocol (PDCP) layer is set in the CU, the protocol layer below the PDCP, for example, radio link control. , RLC) and media access control (MAC) functions are set in the DU. The division of the protocol layer is only an example, and can also be divided in other protocol layers, for example, in the RLC layer, the functions of the RLC layer and the above protocol layer are set in the CU, and the functions of the protocol layer below the RLC layer are set in the DU; Alternatively, in a certain protocol layer, for example, a part of the function of the RLC layer and a function of a protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer are set in the DU. In addition, it may be divided in other manners, for example, according to the delay division, the function that needs to meet the delay requirement is set in the DU, and the function lower than the delay requirement is set in the CU.

3) "Multiple" means two or more, and other quantifiers are similar. "/" describes the association relationship of the associated object, indicating that there can be three kinds of relationships. For example, A/B can indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately.

Please refer to FIG. 1 , which is a schematic diagram of a communication system according to an embodiment of the present application. As shown in FIG. 1, the terminal 120 accesses the wireless network through the network device 110 to acquire a service of an external network (such as the Internet) through the wireless network, or communicates with other terminals through the wireless network. After the terminal 120 is powered on, the terminal is initially connected to the wireless network to obtain the service of the wireless network, and the data is transmitted and received. The following is described in conjunction with FIG. 2. FIG. 2 is a schematic diagram of the terminal initially accessing the wireless network according to the embodiment of the present application. schematic diagram. After the terminal is powered on, the process of cell search, system information reception, random access, etc. is initially accessed into the wireless network, and then data transmission (TX) and reception (RX) can be performed.

During the cell search process, the terminal detects a synchronization signal (SS), determines a cell in which the terminal camps according to the SS, and obtains downlink synchronization with the cell. In the Long Term Evolution (LTE) communication system, the detection of the SS by the terminal is performed by using a channel raster, and the channel raster is 100 kHz for all bands, that is, the carrier center frequency is Integer multiple of 100kHz. The SS includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). In the frequency domain, the PSS and the SSS are mapped to six physical resource blocks (PRBs) in the middle of the carrier (ie, the entire system bandwidth), that is, 72 subcarriers in the middle of the carrier. Since no downlink synchronization is obtained with the cell at this time, in order to prevent interference, 62 subcarriers actually mapped to the middle of the carrier are protected by 5 subcarriers on each side. It can be seen that the SS is located at the center of the carrier, that is, the center frequency of the SS is consistent (or the same) with the center frequency of the carrier. Therefore, after detecting the SS, the terminal can know the center frequency of the carrier. After the cell search, the terminal and the cell obtain downlink synchronization, and can receive downlink information sent by the network device through the cell. For example, a network device broadcasts a bandwidth (or system bandwidth) information of a carrier on a physical broadcast channel (PBCH). The terminal receives the bandwidth information of the carrier, and determines the carrier bandwidth according to the bandwidth information of the carrier. In this way, the terminal can obtain the center frequency of the carrier after detecting the SS, and obtain the carrier bandwidth after searching the PBCH, and then determine the physical resource block (PRB) grid of the carrier according to the center frequency of the carrier and the carrier bandwidth (grid) ).

In the fifth generation (5G) mobile communication system, also known as the New Radio (NR) communication system,

The terminal initially accesses the wireless network also through the process of cell search, system information reception, and random access. In the NR communication system, the concept of a synchronization signal block (SS block) is introduced. The SS block includes an SS and a physical broadcast channel (PBCH), where the SS includes a PSS and an SSS. Please refer to FIG. 3 , which is a schematic diagram of a frequency domain of an SS, a PBCH, and an SS block in which an SS and a PBCH are located according to an embodiment of the present application. As shown in FIG. 3, the SS block occupies 24 PRBs in the frequency domain, that is, 288 subcarriers. The center position of the SS and PBCH in the frequency domain is the center position of the SS block in the frequency domain, that is, the center frequencies of the SS and PBCH are aligned with, or consistent with, the center frequency of the SS block. The SS occupies 12 PRBs, that is, 144 subcarriers; the PBCH occupies 24 PRBs, that is, 288 subcarriers. That is to say, the SS is mapped to 12 PRBs, and the PBCH is mapped to 24 PRBs.

Please refer to FIG. 4 , which is a schematic diagram of a frequency domain of an SS according to an embodiment of the present application. As shown in FIG. 4, the SS is mapped on the 7th to 18th PRBs of the SS block, and the 12 PRBs include 144 subcarriers, numbered from 0 to 143, wherein the SS sequence is mapped to subcarriers of numbers 8 to 134. Up; no other data is mapped on the 8 subcarriers and 9 subcarriers before and after to protect.

The network device transmits the SS block according to the SS raster, that is, the SS can transmit the SS and send the information on the PBCH. The terminal blindly detects the SS according to the SS grid, that is, detects the SS at the position of the SS grid. When the SS is detected, the center frequency of the SS can be known, and the information on the PBCH is received on the 24 PRBs centered on the center frequency. The SS grid is a grid formed by the possible positions of the SS in the frequency domain. When the SS is transmitted at a position of the SS grid, the center frequency of the SS is located at this position. When the subsequent network device 110 periodically transmits the SS in the time domain, the frequency domain position of the SS does not change. When the terminal detects the SS, the PRB grid corresponding to the SS may be determined according to the center frequency of the SS and the subcarrier spacing of the SS, where the subcarrier spacing of the SS refers to the subcarrier spacing used for SS transmission/reception. However, the PRB grid used by the network device to transmit data/control information is centered on the center frequency of the carrier, and the size of the PRB grid is determined according to the subcarrier spacing of the data/control information, where the data/control The subcarrier spacing of information refers to the subcarrier spacing used for data/control information transmission/reception. If the terminal also performs data/control information transmission/reception according to the PRB grid corresponding to the SS, it may be inconsistent with the PRB grid used by the network device, thus causing misinterpretation of the PRB resources, thereby failing to correctly transmit and receive data.

The above problem will be described below with reference to FIG. 5, taking a channel grid of 100 kHz, an SS grid of 180 kHz, and an SS subcarrier spacing of 15 kHz as an example. FIG. 5 is a schematic diagram of an SS grid and a PRB grid according to an embodiment of the present application. The distance between the lower two adjacent vertical lines in Figure 5 represents the size of the SS grid, ie 180 kHz; the distance between the two adjacent vertical lines represents the size of the channel grid, ie 100 kHz. The middle two PRB grids are respectively a PRB grid corresponding to the data/control channel on the carrier and a PRB grid corresponding to the SS. Here, assuming that the subcarrier spacing of the data/control channel on the carrier is the same as the subcarrier spacing of the SS, the PRB size is the same. Assuming that the network device transmits the SS at location 510, the terminal performs blind detection based on the SS grid, detecting SS at location 510; and making location 510 180*N kHz, where N is a non-negative integer. The center frequency of the carrier is at the center of the carrier and is an integer multiple of the channel grid. When the number of PRBs of the carrier is even, the center frequency of the carrier is located between two PRBs, that is, at the junction of two PRBs. When the number of PRBs of the carrier is an odd number, the center frequency of the carrier is located at the center of the intermediate PRB. Let the center frequency of the carrier be 100*M kHz, then the offset between the center frequency of the carrier and the position 510 is |180*N kHz-100*M kHz|, where "| |" indicates an absolute value. The subcarrier spacing of the SS is 15 kHz, and the PRB size corresponding to the SS is 15*12 kHz, that is, 180 kHz; the PRB size corresponding to the data/control channel is also 180 kHz. At this time, the PRB grid corresponding to the SS and the PRB grid corresponding to the data/control channel may not be aligned. If the terminal receives or transmits data according to the PRB grid corresponding to the SS, there may be a resource interpretation error, and the data may not be correctly received or transmitted. The problem caused the quality of communication to drop.

In view of the above problems, the following embodiments provide several solutions to solve the problem of determining the PRB grid.

In a solution, the network device indicates to the terminal the frequency offset between the PRB grid corresponding to the SS and the PRB grid corresponding to the data/control channel, so that when the terminal detects the SS, the terminal may be based on the PRB grid corresponding to the SS. And the frequency offset, determining the PRB grid corresponding to the data/control channel. In this way, the correct transmission and reception of data/control information can be performed on the data/control channel. In this scheme, it is assumed that the PRB corresponding to the SS and the PRB corresponding to the data/control channel have the same subcarrier spacing.

There may be multiple subcarrier spacings on the carrier for data/control channel transmission. When the subcarrier spacing used for data/control channel transmission is the same as the subcarrier spacing of the SS, the PRB grid used for the carrier at this time is the PRB network. grid G _1; when used with a data / control channel subcarrier interval and the SS transmission subcarrier spacing is not the same, so for this case PRB mesh grid carriers is PRB G _2. The PRB grid G ₁ can be obtained by the above scheme to perform transmission and reception of data/control information on the data/control channel. When the subcarrier spacing for the data/control channel transmission is greater than the subcarrier spacing of the SS, the network device may indicate to the terminal the frequency offset between the PRB grid G ₂ and the PRB grid G ₁ such that the terminal may adopt the above method The PRB grid G ₁ is obtained, and in turn the PRB grid G ₂ is obtained for transmission and reception of data/control information on the data/control channel. Alternatively, the network device may indicate to the terminal a frequency offset between the boundary of the PRB grid G ₂ and the center frequency of the SS such that the terminal may offset the PRB grid G ₂ according to the center frequency of the SS and the frequency in the data / Transmission and reception of data/control information on the control channel. When the subcarriers used for data / control channel transmission interval is less than the subcarrier spacing SS, due to nesting relationship between different sub-carrier spacing corresponding to the grid PRB, PRB can be directly from the grid G ₁ and the data for / control channel sub-carrier transmission interval obtained PRB grid G _2, for data on the data / control channel / control the transmission and reception of information.

The frequency offset in the embodiment of the present application is an absolute value, wherein the frequency offset between A and B may refer to the absolute value of the frequency offset of A with respect to B, and may also refer to the absolute value of the frequency offset of B with respect to A. value. In addition, the PRB grid in the embodiment of the present application can be understood as a PRB grid structure.

Description will be made below with reference to the drawings.

Please refer to FIG. 6 , which is a schematic diagram of a communication method according to an embodiment of the present application. As shown in FIG. 6, the method includes the following steps:

S610: The network device sends the SS to the terminal.

S620: The terminal detects the SS.

S630: When the SS is detected, determining the first PRB grid (PRB grid G ₀ ) according to the SS; that is, when the terminal receives the SS from the network device, determining the first PRB grid according to the SS (PRB grid G ₀ ) .

S640: the network device sends indication information to the terminal I _1, I ₁ for the indication information indicating the frequency difference between the first grid PRB (PRB grid G ₀₎ and a second grid PRB (PRB grid G ₁₎ Partial Move F ₁ .

S650: The terminal determines the second PRB grid (PRB grid G ₁ ) according to the first PRB grid (PRB grid G ₀ ) and the frequency offset F ₁ .

After determining the second PRB grid (PRB grid G ₁ ), if the network device uses the subcarrier spacing corresponding to the second PRB grid (PRB grid G ₁ ) on the carrier for data/control information transmission, a network device according to the second allocation grid PRB (PRB grid G ₁₎ of terminal resources, network between the terminal device and data can be RPB according to the second grid (PRB grid G ₁₎ / control information transmission (Step S660).

The first grid PRB (PRB grid G ₀₎ can be referred to as a SS (SS or block) grid PRB (PRB grid G _0), the second grid may be referred to as a PRB PRB for the grid carrier (PRB grid G ₁ ). The first PRB grid is a PRB grid corresponding to the subcarrier spacing of the SS (or SS block) in the frequency domain. The second PRB grid may be a PRB grid corresponding to the subcarrier spacing of the physical channel information/physical signals on the carrier in the frequency domain. The physical channel herein refers to a physical channel other than the PBCH, for example, the physical channel includes an uplink/downlink control channel, an uplink/downlink shared channel (also referred to as a data channel), and at least one of the random access channels; the physical channel information is Refers to information carried on a physical channel; a physical signal refers to a physical signal other than SS, for example, the physical signal includes a reference signal. In the above description, the data/control channel is taken as an example, and the random access channel or physical signal is similar.

In the above step S610, the mesh device transmits the SS at a position of the SS grid, and the center frequency of the SS is located at the position. However, the terminal does not know at which location the network device is sent, so in the above step S620, the terminal performs blind detection according to the SS grid. When the SS is detected at the first location of the SS grid, it may be determined that the location where the network device transmits the SS is the first location, ie, the center frequency of the SS. In addition, the network device can simultaneously broadcast information on the PBCH in S610. When the terminal detects the SS in S620, the terminal can determine the center frequency of the SS, and can also determine the center frequency of the PBCH that is consistent with the center frequency of the SS; The frequency domain location of the PBCH receives the information broadcast by the network device on the PBCH.

In the above step S630, the terminal determines the first PRB grid according to the first position of the SS grid (ie, the center frequency of the SS) and the subcarrier spacing of the SS. One boundary of the first PRB grid is located at the first location, and the size of the PRB in the first PRB grid is the product of the subcarrier spacing of the SS and the number of subcarriers (for example, 12) in the PRB. For example, referring to FIG. 5, when the terminal detects the SS at the location 510, one boundary of the first PRB grid is located at the location 510, and the size of the subcarrier spacing of the SS is 15 kHz, and the size of the PRB is 180 kHz. The lower PRB grid in 5, the first PRB grid.

In the above step S640, the network device may send the indication information to the terminal through I ₁ PBCH. For example, the network device broadcasts a master information block (MIB) on the PBCH, and the MIB carries the above indication information I ₁ . The terminal determines the frequency domain location of the PBCH, the center frequency of the PBCH is the center frequency of the SS, and the PBCH is mapped to the 24 PRBs on both sides of the center frequency; and the indication information I ₁ broadcasted by the network device is received on the PBCH. The indication information I ₁ may be the frequency offset F ₁ itself or may be indication information of the frequency offset F ₁ . For example, the indication information I ₁ may be 1-bit information. When the indication information I ₁ is “0”, the frequency offset F ₁ is indicated as 0, that is, there is no frequency offset, that is, the first PRB grid and the first The two PRB grids are aligned. At this point, the first PRB grid is determined, ie the second PRB grid is determined. For example, when the indication information I ₁ is “1”, the frequency offset F ₁ is indicated as a half PRB. In this case, in step S650, the grid of the first PRB may be offset by half a PRB to obtain the first The grid of two PRBs.

In the above step S650, the terminal information indicating a frequency offset press indicated by I ₁ F ₁ of the first mobile grid PRB in the frequency domain to obtain a second grid PRB.

When the second PRB grid is obtained, data/control information transmission of the second PRB grid corresponding subcarrier spacing may be performed between the terminal and the network device, including uplink transmission/downlink transmission, and the PRB boundary and the second PRB network at this time Alignment. That is, the network device may determine, according to the second PRB grid, a location of the PRB of the subcarrier spacing corresponding to the second PRB grid in the frequency domain, thereby allocating resources for the terminal, and the terminal receives the data/control information on the allocated resource, or Data/control information is transmitted on the allocated resources. At this point, the network device and the terminal have the same understanding of the PRB grid, thereby ensuring the correct interpretation of the resources and the correct transmission and reception of the data/control information.

The PRB boundary of the first PRB grid is aligned with the center frequency of the SS. When the number of PRBs in the carrier is even, the PRB boundary of the second PRB grid is aligned with the center frequency of the carrier. If the grid of the SS is an integer multiple of the channel grid, then the first PRB grid and the second PRB grid are aligned. When the number of PRBs in the carrier is an odd number, the center frequency of the carrier is aligned with the center of one PRB in the second PRB grid. At this time, if the offset between the center frequency of the carrier and the center frequency of the SS is half PRB At integer multiples, the first PRB grid is aligned with the second PRB grid.

The following describes several situations:

The first case: Suppose the size of the SS grid is 360 kHz, the size of the channel grid is 180 kHz, and the subcarrier spacing of the SS is 30 kHz.

The center frequency of the SS is 360*n kHz, the center frequency of the carrier is 180*m kHz, and the subcarrier spacing of 30kHz corresponds to a PRB size of 360 kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |360*n-180*m|kHz, ie 180*|2n-m|kHz. Let |2n-m|=k, then the frequency offset between the center frequency of the carrier and the center frequency of the SS is 180*k kHz. Where m, n, and k are non-negative integers, and "||" represents an absolute value.

Please refer to FIG. 7(1): When the number of PRBs with subcarrier spacing of 30 kHz in the carrier is even, the center frequency of the carrier is at the boundary of the second PRB grid. At this time, m is an even number, and |2n-m| is an even number, that is, k is an even number, and the frequency offset between the center frequency of the carrier and the center frequency of the SS is 180*k kHz, which is an integer of the PRB size (360 kHz). In this case, the first PRB grid and the second PRB grid are aligned.

Please refer to FIG. 7(2): When the number of PRBs with subcarrier spacing of 30 kHz in the carrier is an odd number, the center frequency of the carrier is at the center of the second PRB grid, that is, the center of the intermediate PRB. At this time, m is an odd number, and |2n-m| is an odd number, that is, k is an odd number, and the frequency offset between the center frequency of the carrier and the center frequency of the SS is 180*k kHz, which is an integer of the PRB size (360 kHz). The remaining 1/2 PRB is half of the PRB size. At this time, the first PRB grid and the second PRB grid are aligned.

Therefore, regardless of whether the number of PRBs with subcarrier spacing of 30 kHz in the carrier is odd or even, the alignment of the first PRB grid and the second PRB grid can be ensured. Therefore, the indication information I ₁ at this time can indicate the frequency offset F. ₁ is 0. For example, when the indication information I ₁ is "0", the frequency offset F ₁ is indicated as 0.

The second case: Suppose the size of the SS grid is 360 kHz, the size of the channel grid is 180 kHz, and the subcarrier spacing of the SS is 15 kHz.

The position of the center frequency of the SS is 360*n kHz, the position of the center frequency of the carrier is 180*m kHz, and the size of the PRB corresponding to the subcarrier spacing of 15 kHz is 180 kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |360*n-180*m|kHz, ie 180*|2n-m|kHz. Let |2n-m|=k, then the frequency offset between the center frequency of the carrier and the center frequency of the SS is 180*k kHz. Where m, n, and k are non-negative integers, and "| |" represents an absolute value.

Please refer to FIG. 8(1): When the number of PRBs with subcarrier spacing of 15 kHz in the carrier is even, the center frequency of the carrier is at the boundary of the second PRB grid. At this time, m is an even number, and |2n-m| is an even number, that is, k is an even number, and the frequency offset between the center frequency of the carrier and the center frequency of the SS is 180*k kHz, which is an integer of the PRB size (180 kHz). In this case, the first PRB grid and the second PRB grid are aligned.

Please refer to FIG. 8(2): When the number of PRBs with subcarrier spacing of 15 kHz in the carrier is an odd number, the center frequency of the carrier is at the center of the second PRB grid, that is, the center of the intermediate PRB. At this time, m is an odd number, and |2n-m| is an odd number, that is, k is an odd number, and the frequency offset between the center frequency of the carrier and the center frequency of the SS is 180*k kHz, which is an integer of the PRB size (180 kHz). Times. At this time, the first PRB grid and the second PRB grid are not aligned, and are offset by half a PRB.

At this time, the 1-bit indication information I ₁ may be used to indicate the frequency offset F ₁ between the first PRB grid and the second PRB grid. When the indication information is “0”, indicating that the frequency offset F ₁ between the first PRB grid and the second PRB grid is 0, that is, the first PRB grid and the second PRB grid are aligned; When the indication information is “1”, indicating that the frequency offset F ₁ between the first PRB grid and the second PRB grid is half PRB, that is, there is a bias between the first PRB grid and the second PRB grid. Move the positional relationship of half of the PRBs. Of course, the contents indicated by “0” and “1” may be reversed, and the application does not limit this.

The third case: assuming that the size of the SS grid is 180 kHz, the size of the channel grid is 100 kHz, and the subcarrier spacing of the SS is 15 kHz.

The position of the center frequency of the SS is 180*n kHz, the position of the center frequency of the carrier is 100*m kHz, and the size of the PRB corresponding to the subcarrier spacing of 15 kHz is 180 kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |180*n-100*m|kHz. Where m and n are non-negative integers, and “| |” represents an absolute value. At this time, the frequency offset between the center frequency of the carrier and the center frequency of the SS differs depending on the values of m and n, and the frequency offset F ₁ between the first PRB grid and the second PRB grid There are many possibilities.

In one implementation, the indication information may be used to directly indicate the frequency offset F ₁ between the first PRB grid and the second PRB grid. In another implementation, a predefined set of offsets includes all possible values of a frequency offset between the first PRB grid and the second PRB grid, which in this example may be {0, 10, 20, 30, 40, 60, 70, 80, 90, 100, 110, 120, 130, 140, 160, 170} kHz, a total of 16 values. At this time, the 4-bit indication information I ₁ may be used to indicate one of the offset sets. Terminal and network equipment understanding indication contents information indicated by I ₁ is consistent. In addition, 1-bit indication information or indicator bits are also used to indicate the offset direction.

In addition, the offset directions are different, and the frequency offset between the first PRB grid and the second PRB grid is also different. Therefore, in one implementation, the offset to the high frequency direction or the low frequency direction may be predefined, that is, the offset direction is predefined, and the understanding of the offset direction by the network device and the terminal is consistent. In another implementation, another indication information I ₂ is added or 1 bit is added to the indication information for indicating the offset direction. For example, "0" is used to indicate a shift in the low frequency direction, and "1" is used to indicate a shift in the high frequency direction. Of course, the contents indicated by “0” and “1” may be reversed, and the application does not limit this.

When the frequency offset between the center frequency of the carrier and the center frequency of the SS is not an integer multiple of the 1/2 PRB size, a third case may be used to indicate between the first PRB grid and the second PRB grid. Frequency offset F ₁ .

For example, if the size of the SS grid is 180 kHz, the size of the channel grid is 100 kHz, and the subcarrier spacing of the SS is 15 kHz, when the offset direction is shifted to the low frequency direction, the offset set can be {0, 10, 20 , 30, 40, 60, 80, 90, 100, 110, 120, 130, 140, 160} kHz; when the offset direction is shifted to the high frequency direction, the offset set may be {0, 20, 40, 60, 70, 80, 90, 100, 120, 140, 160, 170} kHz.

The fourth case: assuming that the size of the SS grid is 100 kHz, the size of the channel grid is 100 kHz, and the subcarrier spacing of the SS is 15 kHz.

The position of the center frequency of the SS is 100*n kHz, the position of the center frequency of the carrier is 100*m kHz, and the size of the PRB corresponding to the subcarrier spacing of 15 kHz is 180 kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |100*n-100*m|kHz. Where m and n are non-negative integers, and “| |” represents an absolute value. At this point, the SS grid and the channel grid can be considered to be aligned.

When the number of PRBs with subcarrier spacing of 15 kHz in the carrier is even, the first PRB grid and the second PRB grid are aligned. When the number of PRBs with subcarrier spacing of 15 kHz in the carrier is an odd number, the first PRB grid and the second PRB grid are offset by 10 kHz or 90 kHz. At this time, the offset direction may be predefined to be shifted to the high frequency direction or to the low frequency direction. Between 1-bit information indicated by I ₁ indicates a first grid and a second PRB PRB offset grid frequency F _1. One of the values indicates that the frequency offset is 0, that is, no offset; the other value is offset by 10 kHz or 90 kHz. Alternatively, the frequency offset value and the offset direction may be indicated by the 2-bit indication information I ₁ . For example, "00" indicates that the frequency offset is 0, that is, no offset; "01" indicates that the first PRB grid is shifted by 10 kHz in the low frequency direction (or 90 kHz in the high frequency direction) to obtain a second PRB grid. . "10" indicates that the first PRB grid is shifted by 10 kHz in the high frequency direction (or 90 kHz in the low frequency direction) to obtain a second PRB grid.

Similarly, when the size of the SS grid is 100 kHz, the size of the channel grid is 100 kHz, and the subcarrier spacing of the SS is 30 kHz, when the number of PRBs with subcarrier spacing of 30 kHz in the carrier is even, the first PRB grid Aligned with the second PRB grid. When the number of PRBs in the carrier where the subcarrier spacing is 30 kHz is an odd number, the first PRB grid and the second PRB grid are offset by 20 kHz or 80 kHz. The indication manner is the same as the above description, and details are not described herein again.

The fifth case: for a high frequency communication system, that is, a communication system in which the carrier frequency is higher than 6 GHz.

For example, the size of the SS grid is 2880 kHz, the size of the channel grid is 720 kHz, and the subcarrier spacing of the SS is 120 kHz. Then, regardless of whether the number of 120 kHz PRBs in the carrier is odd or even, the channel raster and the SS raster can be guaranteed. The offset value is 720*k. Then, it can be ensured that the first PRB grid and the second PRB grid are aligned, and the indication information I ₁ may not be broadcast in the PBCH in the high frequency communication system.

For another example, the size of the SS grid is 11520 kHz, the size of the channel grid is 720 kHz, and the subcarrier spacing of the SS is 240 kHz. Then, regardless of whether the number of 240 kHz PRBs in the carrier is odd or even, the offset value between the channel grid and the SS grid can be guaranteed to be 720*k. It can be seen that in the high frequency communication system, the SS grid is an integer multiple of the channel grid, and the first PRB grid and the second PRB grid can be ensured to be aligned, and the indication can not be broadcasted in the PBCH in the high frequency communication system. Information I ₁ .

In each of the above cases, the size of the SS grid, the size of the channel grid, and the subcarrier spacing of the SS may be determined according to the frequency of the carrier, for example, according to the frequency band in which the carrier is located. For example, the carrier frequency band of 1.8 GHz supports the second case, in which the relationship between the first PRB grid and the second PRB grid is indicated by the indication information I ₁ . For another example, the carrier frequency band of 3.5 GHz supports the first case, in which the relationship between two PRBs may not be indicated or the frequency offset is 0, the terminal defaults that the first PRB and the second PRB are aligned. For details, see Table 1 below.

Table 1

For the first case and the fifth case, the indication information I ₁ may not be transmitted except that the indication information indicates that the frequency offset is 0. For example, in a high frequency communication system, the indication information I ₁ may not be transmitted by default. The terminal assumes (or defaults) that the PRB grid for the SS (or SS block) is the same (or consistent) as the PRB grid for the carrier.

In the above table, the selection of the SS sub-carrier spacing, the SS grid and the channel grid in different frequency ranges may select only one of the combinations, and may also select multiple combinations, which is not limited in this application.

In yet another aspect of the present application, the terminal assumes (or defaults) that the PRB grid for the SS (or SS block) is the same (or identical) to the structure of the PRB grid for the carrier. At this time, the terminal defaults the PRB grid for the SS (or SS block) to the PRB grid for the carrier to perform correct transmission and reception of the data/control information on the data/control channel. At this time, the network device may determine the size X of the SS grid, the size Y of the subcarrier spacing, and the size Z of the channel grid according to the frequency of the carrier, such that X=Z*M1, and Y*12=Z*N1, M1 And N1 is an integer greater than or equal to 2. Since the above formula is satisfied, the PRB grid for the SS (or SS block) is the same (or identical) to the structure of the PRB grid for the carrier, which is consistent with the assumption of the terminal, so the terminal can be on the data/control channel. Proper transmission and reception of data/control information.

Please refer to FIG. 9 , which is a schematic diagram of another communication method according to an embodiment of the present application. In this method, the terminal defaults to the SPB grid of the SS and the PRB grid for the carrier is the same or aligned. As shown in FIG. 9, the method includes the following steps:

S910: The terminal receives the SS from the network device.

S920: The terminal determines, according to the SS, a first PRB grid, where the first PRB grid is aligned (or consistent) with a PRB grid for data/control information transmission on the carrier;

S930: The terminal receives/transmits data/control information on the carrier by using the PRB grid with the first PRB grid as a carrier.

The process of the terminal receiving the SS and determining the first PRB grid according to the SS is the same as the steps S620 and S630 in the foregoing embodiment, and details are not described herein again.

In the above step S930, the terminal defaults the PRB grid for the SS and the PRB grid for the carrier to be the same or aligned, and the PRB grid for the SS is used as the PRB grid of the carrier, because the carrier is used for data/control The PRB grid of information transmission is aligned with the PRB grid for SS, and the terminal can correctly interpret the frequency resources and receive and transmit the data/control information.

Please refer to FIG. 10 , which is a schematic diagram of still another communication method according to an embodiment of the present application. In this method, the terminal defaults to the SPB grid of the SS and the PRB grid for the carrier is the same or aligned. As shown in FIG. 10, the method includes the following steps:

S101: The network device determines the size of the SS grid, the size of the channel grid, and the subcarrier spacing according to the frequency of the carrier.

S102: The network device sends the SS in the first position of the SS grid by using the determined subcarrier spacing, where the center frequency of the SS is located at the first location.

S103: The network device transmits or receives data/control information on the carrier by using the determined subcarrier spacing, wherein the PRB grid for the carrier is the same as the PRB grid for the SS.

Wherein, the size X of the SS grid, the size Y of the subcarrier spacing and the size Z of the channel grid, X=Z*M1, and Y*12=Z*N1, and M1 and N1 are integers greater than or equal to 2.

The NR communication system supports multiple subcarrier spacings, such as {3.75, 7.5, 15, 30, 60, 120, 240, 480} kHz. A plurality of subcarrier spacings can be supported on one carrier, and PRBs corresponding to different subcarrier spacings are located on the PRB grid, that is, different subcarrier spacings have different PRB grids. The PRB grids corresponding to different subcarrier spacings have a nested relationship in the frequency domain. For example, FIG. 11 is a schematic diagram of a PRB grid corresponding to multiple subcarrier spacings according to an embodiment of the present disclosure. The left side f ₀ , 2f ₀ , 4f ₀ and 8f ₀ represent the subcarrier spacing, and the grid corresponding to the spacing of these subcarriers represents the PRB grid under the corresponding subcarrier spacing. It can be seen that the PRB grid corresponding to the different subcarrier spacing is There are nested relationships in the frequency domain. After determining the PRB grid corresponding to a seed carrier interval, the terminal cannot determine other PRB grids corresponding to the subcarrier spacing larger than the subcarrier spacing. For example, as shown in FIG. 11, the boundary of the PRB grid corresponding to the subcarrier spacing f ₀ may fall on the boundary of the PRB grid corresponding to 2f ₀ , or may fall on the PRB in the PRB grid corresponding to the subcarrier spacing 2f ₀ . center of. Therefore, the terminal cannot determine the PRB grid corresponding to 2f ₀ . If the terminal is determined subcarrier spacing 2f ₀ PRB corresponding to a grid, the subcarrier spacing f ₀ corresponding to the boundary mesh PRB only on the boundary 2f ₀ PRB corresponding to the grid spacing in the subcarriers, the subcarriers may thus The interval f ₀ directly determines the PRB grid corresponding to the subcarrier spacing f ₀ .

In view of this problem, the present embodiment provides another application communication method, in this method, a network device transmits to the terminal between different indication PRB subcarrier spacing grid corresponding indication information I _3, I ₃ for the indication The frequency offset, so the terminal can determine the unknown PRB grid based on the known PRB grid and the frequency offset. The known PRB grid may be the PRB grid G ₁ in the above embodiment, that is, the subcarrier spacing corresponding to the known PRB grid is the same as the subcarrier spacing of the SS, and the known PRB grid is acquired. Example G PRB method for obtaining _a network with the above embodiment of the method, not described herein again.

Please refer to FIG. 12 , which is a schematic diagram of another communication method according to an embodiment of the present application. As shown in FIG. 12 , the method includes the following steps:

S121: The terminal determines the PRB grid D ₁ , where the subcarrier spacing corresponding to the PRB grid D ₁ is S ₁ .

S122: the network device sends indication information to the terminal I _3; the indication information indicates PRB and PRB mesh _{grid. 1} D D F between the frequency offset _{_22,} wherein D ₂ mesh PRB corresponding subcarrier spacing S ₂ , wherein the subcarrier spacing S _{2 is} greater than the subcarrier spacing is S ₁ . The terminal receives the indication information I ₃ from the network device, and performs the following step S123.

S123: The terminal D ₁ and PRB grid frequency offset F _2, the grid is determined PRB D _2.

Thereafter, the data between the terminal and the network device / transmission of control information (S124), wherein the network device based on the grid PRB allocated to the terminal for the D ₂ data / control information transmission resources, the terminal determines that the grid PRB D _{After 2} , the network device has the same understanding of resources, which improves the correctness of data/control information transmission.

The PRB grid D ₁ may be the PRB grid G ₁ in the above embodiment. The terminal may determine the PRB grid D ₁ by using the method in the foregoing embodiment, and details are not described herein again. Or the terminal default PRB grid D ₁ (PRB grid G ₁ ) and the PRB grid (PRB grid G ₀ ) for SS (or SS block) are the same (or consistent), then the terminal after detecting the SS, according to The detected SS directly determines the PRB grid D ₁ .

PRB corresponding to the grid D ₁ subcarrier spacing S ₁ SS may subcarrier spacing. PRB corresponding to the grid D ₂ larger than the subcarrier spacing S ₂ SS subcarrier spacing.

Network device may send the indication information I ₃ through the PBCH; the terminal may receive the indication information I ₃ through PBCH. Alternatively, the network device may send the information indicating the remaining minimum system information (remaining minimum system information, RMSI) I 3; terminal receives the RMSI, the indication information RMSI I _3. Alternatively, the network level signaling device may, for example, RRC (radio resource control, RRC) message to transmit the indication information I _3; terminal receives the high-level signaling, the high-band signaling information indicating the I _3.

The method in this embodiment can be combined with the method of the above embodiment. When the carrier supports multiple subcarrier spacings, the multiple subcarrier spacing includes a subcarrier spacing S ₁ and a subcarrier spacing S ₂ , where the subcarrier spacing S ₁ is the same as the subcarrier spacing of the SS, and the subcarrier spacing S ₂ and the subcarriers of the SS The intervals are different. When detecting the SS, the terminal may determine the PRB grid for the SS according to the SS. When the PRB grid used by the terminal for the SS is the same as the PRB grid for the carrier, the PRB grid of the SS may be used as the PRB. Grid D ₁ . When the terminal according to the instruction information transmitted from the network device I ₁ for determining carrier PRB grid, using the above embodiments indication information I ₁ determined according to D ₁ PRB grid. Further, the PRB grid D _{2 is} determined based on the PRB grid D ₁ and the indication information I ₃ . Thus, the support can be realized as data on a subcarrier spacing of S ₁ and S ₂ of the carrier / correct transmission of control information. More subcarrier spacing is similar, and will not be described here.

The terminal default PRB grid D ₁ (PRB grid G ₁ ) is the same as the PRB grid G ₀ for the SS (or SS block), and after detecting the SS, the terminal determines the above PRB grid D according to the detected SS. ₂ . Please refer to FIG. 13 , which is a schematic diagram of another communication method according to an embodiment of the present application. As shown in FIG. 13 , the method includes the following steps:

S131: The network device sends the SS to the terminal.

S132: The terminal detects the SS.

S133: Determine the center frequency of the SS when the SS is detected.

S134: the network device sends indication information to the terminal I _4, I ₄ the indication information for indicating the boundary frequency between the center frequency of the PRB SS grid offset D ₂ F _3.

S135: The terminal determines the PRB grid D ₂ according to the center frequency of the SS and the frequency offset F ₃ .

Thereafter, the data between the terminal and the network device / transmission of control information (S136), wherein the network device based on the grid PRB allocated to the terminal for the D ₂ data / control information transmission resources, the terminal determines that the grid PRB D _{After 2} , the network device has the same understanding of resources, which improves the correctness of data/control information transmission.

D ₂ mesh above PRB corresponding subcarrier interval S is larger than the subcarrier spacing SS _2.

The network device may send the indication information I ₄ through the PBCH; the terminal may receive the indication information I ₄ through the PBCH. Alternatively, the network device may send the indication information by RMSI I _4; terminal receives the RMSI, the indication information RMSI I _4. Alternatively, the network level signaling device may, for example, the RRC message transmitting the indication information I _4; terminal receives the high-level signaling, the high-band signaling information indicating the I _4.

Please refer to FIG. 14 , which is a schematic diagram of a PRB grid according to an embodiment of the present application. It is assumed that the subcarrier spacing corresponding to the PRB grid D ₁ or the subcarrier spacing of the SS is the reference subcarrier spacing f ₀ , and the subcarrier spacing corresponding to the PRB grid D ₂ is f ₁ . As shown in Fig. 14 (1), f ₁ /f ₀ = 2: For the embodiment shown in Fig. 12, the boundary of the PRB grid D ₁ may be located at the boundary of the PRB grid D ₂ (position 0 in the figure). It can also be located at the center of the PRB of the PRB grid D ₂ (position 1 in the figure). At this time, the position can be indicated by the 1-bit indication information I ₃ , for example, “0” indicates position 0, and “1” indicates position. 1. Of course, the meaning of the value of the indication information I ₃ can also be reversed, and no limitation is imposed on this. For the embodiment shown in FIG. 13, the center frequency of the SS (or SS block) may be located at the boundary of the PRB grid D ₂ (position 0 in the figure), or may be located at the center of the PRB of the PRB grid D ₂ (as shown in the figure). In the middle position 1), the position can be indicated by the 1-bit indication information I ₄ at this time, for example, "0" indicates position 0, and "1" indicates position 1. Of course, the meaning of the value of the indication information I ₄ can also be reversed, and no limitation is imposed on this. The above position can be represented by a frequency offset, that is, position 0 indicates that the frequency offset F ₂ or F ₃ is 0, and position 1 indicates that the frequency offset F ₂ or F ₃ is half PRB. PRB corresponding to subcarriers of the same PRB grid spacing D ₂ corresponding to the subcarrier spacing.

As shown in FIG. 14(2), f ₁ /f ₀ =4: For the embodiment shown in FIG. 12, the boundary of the PRB grid D ₁ may be located at the boundary of the PRB grid D ₂ (position 0 in the figure). It can also be located at 1/4 of the PRB of the PRB grid D ₂ (position 1 in the figure), or at the center of the PRB of the PRB grid D ₂ (position 2 in the figure), or in the PRB grid D ₂ 3/4 of the PRB (position 3 in the figure). 2 can be used at this time, bit information indicating position to indicate that the I _3, for example, "00" indicates the position 0, "01" indicates the position 1, "10" indicates the position 2, "11" indicates the position 3. For the embodiment shown in FIG. 13, the center frequency of the SS (or SS block) may be located at the boundary of the PRB grid D ₂ (position 0 in the figure), or may be located at 1/4 of the PRB of the PRB grid D ₂ (Position 1 in the figure), it can also be located at the center of the PRB of the PRB grid D ₂ (position 2 in the figure) or at 3/4 of the PRB of the PRB grid D ₂ (position 3 in the figure). Then, the position can be indicated by the 2-bit indication information I ₄ at this time, for example, "00" indicates position 0, "01" indicates position 1, "10" indicates position 2, and "11" indicates position 3. The above position can be expressed by the frequency offset, that is, the position 0 indicates that the frequency offset F ₂ or F ₃ is 0, the position 1 indicates that the frequency offset F ₂ or F ₃ is 1/4 PRB, and the position 2 indicates the frequency offset F ₂ or F ₃ is 1/2 PRB, and position 3 indicates that the frequency offset F ₂ or F ₃ is 3/4 PRB. PRB corresponding to subcarriers of the same PRB grid spacing D ₂ corresponding to the subcarrier spacing. The possible position number of a PRB in the PRB grid D ₂ can be predefined from the low frequency domain position to the high frequency domain position number or the predefined number from the high frequency domain position to the low frequency domain position. Or use 1 bit to indicate the direction of the number, that is, the direction of the offset.

It has been described in the above embodiments that the PRB grid D ₂ can be used for data/control information transmission, for example, the PRB grid D2 can be used for transmission of RMSI. The PRB grid D2 is now the PRB grid of the RMSI. The method of determining the PRB grid D2 provided by the above embodiments may be used to determine the PRB grid of the RMSI. The PRB grid of the RMSI refers to the PRB grid corresponding to the subcarrier spacing used to transmit the RMSI. In this case, the subcarrier spacing is the RMSI more PRB corresponding to the grid D ₂ subcarrier spacing S _2. The following describes the PRB grid with the PRB grid D2 as the RMSI as an example.

Please refer to FIG. 24 , which is a schematic diagram of still another communication method according to an embodiment of the present application. As shown in FIG. 24, the method includes the following steps:

S241: The network device sends the SS block.

The SS block includes an SS and a PBCH, where the information of the subcarrier spacing S ₂ of the RMSI is carried on the PBCH.

S242: The terminal detects the SS and receives the information on the PBCH.

After detecting the SS, the terminal can determine the center frequency of the SS, and then receive the information on the PBCH on the 24 PRBs centered on the center frequency. In this way, the terminal can obtain the subcarrier spacing S _{2 of the} RMSI. Since the subcarrier spacing S _{2 of the} RMSI may be different from the subcarrier spacing of the SS, as described in the above embodiments, when the subcarrier spacing S _{2 of the} RMSI is greater than the subcarrier spacing of the SS, the network device indicates the PRB grid to the terminal. The frequency between D ₁ and PRB grid D ₂ is offset by F ₂ so that the terminal determines the PRB grid D2 of the RMSI from the PRB grid D ₁ . For example, the network device sends indication information I ₀ to the terminal, the indication information being used to determine the PRB grid of the RMSI. At this time, the above methods also include:

S243: The network device sends the indication information I ₀ to the terminal, where the indication information is used to determine a PRB grid of the RMSI.

The network device can send the indication information I ₀ through the PBCH.

S244: The terminal receives the indication information I ₀ , and determines a PRB grid of the RMSI according to the indication information I ₀ .

The terminal determines the PRB grid D ₁ according to any of the above embodiments, and further determines the PRB grid of the RMSI according to the PRB grid D ₁ and the indication information I ₀ .

S245: The terminal receives the RMSI according to the determined PRB grid of the RMSI.

The following describes several implementations indication information I _0, which indicates the information I ₀ is suitable for implementation in any preceding meshes determination scheme PRB of D _2, D ₂ of the PRB grid, for example, in FIG. 24 RMSI a PRB grid.

Solution 1: Indicate the relative position between the PRB grid D ₁ and the PRB grid D ₂

Instructions I ₀ may include a 2-bit information bits, for different D ₁ of the corresponding subcarrier PRB grid spacing S ₁ and PRB grid D ₂ corresponding to the subcarrier spacing S _2, the 2-bit interpreting the information bits are different .

Please refer to FIG. 25 , which is a schematic diagram of a PRB grid according to an embodiment of the present application. It is assumed that the subcarrier spacing corresponding to the PRB grid D ₁ is the reference subcarrier spacing f ₀ , and the subcarrier spacing is equal to the subcarrier spacing of the SS; the subcarrier spacing corresponding to the PRB grid D ₂ is f ₁ . As shown in FIG. 25, FIG. 25(1) shows an example where the subcarrier spacing is f ₀ is 15 kHz, the subcarrier spacing is f ₁ is 30 kHz, and FIG. 25 (2) is subcarrier spacing f ₀ is 30 kHz, and the subcarrier spacing is Let f ₁ be 60 kHz as an example, where f ₁ /f ₀ =2. At this time, one boundary of the PRB grid D ₁ (taking the boundary B1 in the figure as an example) may be located at the boundary of the PRB grid D ₂ (indicated by position 0 in the figure), or may be located at the center of the PRB of the PRB grid D ₂ . (in the figure, it is indicated by position 1).

At this time, the 2-bit indication information I ₀ can be used to indicate the grid position, for example, "00" indicates position 0, "01" indicates position 1, "10" and "11" as reserved information bits. Certainly, the meaning of the value of the indication information I ₀ may also have other explanations, for example, “10” indicates position 0, “11” indicates position 1, “00” and “01” as reserved information bits; . The above grid position can be represented by a frequency domain offset, that is, “00” indicates that the frequency domain offset is 0, and “01” indicates that the frequency domain offset is half PRB or 6 subcarriers, and the corresponding subcarrier of the PRB or subcarrier. The carrier spacing is the same as the subcarrier spacing corresponding to the PRB grid D ₂ . Or "00" represents the frequency domain migration is 0, "01" denotes an offset of a PRB or 12 subcarriers, the subcarriers or subcarriers PRB corresponding to the same PRB grid spacing D corresponds to _a sub-carrier interval.

Please refer to FIG. 26 , which is a schematic diagram of another PRB grid provided by an embodiment of the present application. It is assumed that the subcarrier spacing corresponding to the PRB grid D ₁ is the reference subcarrier spacing f ₀ , and the subcarrier spacing is equal to the subcarrier spacing of the SS; the subcarrier spacing corresponding to the PRB grid D ₂ is f ₁ . As shown in FIG. 26, the subcarrier spacing is f ₀ is 15 kHz, and the subcarrier spacing is f ₁ is 60 kHz, where f ₁ /f ₀ =4. At this time, one boundary of the PRB grid D ₁ (taking the boundary B2 in the figure as an example) may be located at the boundary of the PRB grid D ₂ (indicated by position 0 in the figure), or may be located in the PRB of the PRB grid D ₂ . /4 (indicated by position 1 in the figure), can also be located in the center of the PRB of the PRB grid D ₂ (indicated by position 2 in the figure), or at 3/4 of the PRB of the PRB grid D ₂ (in the figure) Expressed in position 3). The frequency domain offset direction may be predefined to shift the boundary B1 from the low frequency domain position to the high frequency domain position or the predefined boundary B1 from the high frequency domain position to the low frequency domain position, or use 1 bit to indicate the direction of the offset.

At this time, the grid position can be indicated by the 2-bit indication information I ₀ . For example, “00” indicates position 0, “01” indicates position 1, “10” indicates position 2, and “11” indicates position 3. Of course, the meaning of the indication information I ₀ can also have other explanations, and no limitation is imposed on this. The above grid position can be represented by a frequency domain offset. For example, "00" indicates that the frequency domain offset is 0, "01" indicates that the frequency domain offset is 1/4 PRB or 3 subcarriers, and "10" indicates frequency. The domain offset is 1/2 PRB or 6 subcarriers, and “11” indicates that the frequency domain offset is 3/4 PRBs or 9 subcarriers, and the corresponding subcarrier spacing of the PRB or subcarrier corresponds to the PRB grid D _{2 .} The subcarrier spacing is the same. Or "00" indicates that the frequency domain offset is 0, "01" indicates that the frequency domain offset is 1 PRB or 12 subcarriers, "10" indicates that the frequency domain offset is 2 PRBs or 24 subcarriers, and "11" indicates 3 offset frequency domain PRB or 36 subcarriers, the subcarriers or subcarriers PRB corresponding to the same PRB grid spacing D corresponds to _a sub-carrier interval. The frequency domain offset direction may pre-define the boundary B2 from the low frequency domain position to the high frequency domain position offset or the predefined boundary B2 from the high frequency domain position to the low frequency domain position, or use 1 bit to indicate the direction of the offset.

In addition, one boundary of the above PRB grid D ₁ has an offset with respect to the center frequency of the SS (offset as shown in the figure), and the offset may be “0”, and the PRB grid of the SS may be used as the PRB grid D ₁ .

It can be seen that, in the present solution, the indication information I ₀ can be used to indicate the relative position between the PRB grid D ₁ and the PRB grid D ₂ , and the relative position can be a frequency domain offset or a PRB grid D ₁ The position of the preset boundary on the PRB grid D ₂ .

Solution 2: Instruct the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band, thereby implicitly acquiring the PRB grid D ₂ .

The indication information I ₀ may include a 2-bit information bit for indicating a PRB grid corresponding to the maximum sub-carrier spacing supported by the carrier frequency band. For example, in a carrier below 6 GHz, no matter how large the subcarrier of the RMSI is, the indication information is used to indicate the PRB grid corresponding to 60 kHz.

If the subcarrier spacing of the SS is 15 kHz, the subcarrier spacing corresponding to the PRB grid D ₁ is 15 kHz. Then, the indication information I ₀ indicates the relative position between the PRB grid D ₂ ′ and the PRB grid D ₁ corresponding to the maximum subcarrier spacing supported by the carrier frequency band, and the relative position may be a frequency domain offset or a PRB grid D _{The position of 1} on the PRB grid D ₂ '. For example, the indication information I ₀ is “00” indicating that the frequency domain offset is 0, “01” indicates that the frequency domain offset is 1/4 PRB or 3 subcarriers, and “10” indicates that the frequency domain offset is 1/2. PRB or 6 subcarriers, "11" indicates that the frequency domain offset is 3/4 PRBs or 9 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the maximum subcarrier spacing (60 kHz) supported by the current carrier frequency band. Or the indication information I ₀ is “00” indicating that the frequency domain offset is 0, “01” indicates that the frequency domain offset is 1 PRB or 12 subcarriers, and “10” indicates that the frequency domain offset is 2 PRBs or 24 subcarriers. The "11" indicates that the frequency domain offset is 3 PRBs or 36 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the subcarrier spacing of the SS. The frequency domain offset direction may pre-define the boundary B2 of the PRB grid D1 from the low frequency domain position to the high frequency domain positional offset or the boundary of the predefined PRB grid D1 from the high frequency domain position to the low frequency domain position, or use 1 bit indicates the direction of the offset.

If the subcarrier spacing of the SS is 30 kHz, the subcarrier spacing corresponding to the PRB grid D ₁ is 30 kHz. Then, the indication information I ₀ indicates the relative position between the PRB grid D ₂ ′′ corresponding to the maximum subcarrier spacing supported by the carrier frequency band and the PRB grid D ₁ , and the relative position may be a frequency domain offset or a PRB grid D _{The position of 1} on the PRB grid D ₂ ”. For example, the indication information I ₀ is “00” indicating that the frequency domain offset is 0, “01” indicates that the frequency domain offset is half PRB or 6 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the current carrier frequency band support. Maximum subcarrier spacing (60kHz). Or the indication information I ₀ is “00” indicating that the frequency domain offset is 0, “01” indicates that the offset is 1 PRB or 12 subcarriers, and the subcarrier spacing corresponding to the PRB or the subcarrier is the same as the subcarrier spacing of the SS. The frequency domain offset direction may pre-define the boundary B1 of the PRB grid D1 from the low frequency domain position to the high frequency domain position offset or the boundary B1 of the predefined PRB grid D1 from the high frequency domain position to the low frequency domain position, or use 1 bit indicates the direction of the offset.

The meaning of the above indication information I ₀ may also have other explanations, and no limitation is imposed thereon.

When the PRB grid corresponding to the maximum subcarrier spacing supported by the current carrier frequency band is determined, the PRB grid D ₂ may be determined according to the nesting relationship between different subcarrier spacings shown in FIG.

It can be seen that, in this solution, the indication information I ₀ can be used to indicate a PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band. For example, indicating a relative position between the PRB grid D ₁ and the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band, the relative position may be a frequency domain offset or a preset boundary of the PRB grid D ₁ The position on the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier band.

Scheme 3: indicating the relative position between the PRB grid D ₁ and the PRB grid D ₂

In the initial access procedure, the RMSI is used for the terminal to access the carrier. At this time, the subcarrier spacing of the RMSI is supported by all terminals. In the frequency band below 6 GHz, the subcarrier spacing of 60 kHz may not be applicable to all terminals, and the candidate subcarrier spacing of the RMSI may be only 15 kHz or 30 kHz. In this case, the second indication information I _{0 of 1} bit may be transmitted on the PBCH to Indicates the PRB grid corresponding to the subcarrier spacing of the RMSI.

For example, the indication information I ₀ is “0” indicating that the frequency domain offset is 0, “1” indicates that the half PRB or the 6 subcarriers are offset, and the subcarrier spacing corresponding to the PRB or the subcarrier is the subcarrier spacing of the RMSI. Or the indication information I ₀ is “0” indicating that the frequency domain offset is 0, and “1” indicates that the frequency domain offset is 1 PRB or 12 subcarriers, and the PRB or subcarrier spacing is the same as the subcarrier spacing of the SS. The frequency domain offset direction may pre-define the boundary B1 or B2 in the PRB grid D1 from the low-frequency domain position to the high-frequency domain positional offset or the boundary B1 or B2 in the predefined PRB grid D1 from the high-frequency domain position to the low-frequency domain position Shift, or use 1 bit to indicate the direction of the offset.

It can be seen that in the present scheme, the candidate subcarrier spacing of the RMSI is two, and the indication information I ₀ includes a 1-bit information bit, which can be used to indicate the relative position between the PRB grid D ₁ and the PRB grid D ₂ , the relative position may be a position offset in the frequency domain or grid PRB ₁ D a predetermined boundary in a grid PRB of D _2.

Option 4: Joint PRB Grid indicating RMSI subcarrier spacing and RMSI.

In the initial access process, the RMSI is used for the terminal to access the carrier. At this time, the subcarrier spacing of the RMSI is supported by all terminals. In the frequency band below 6 GHz, the subcarrier spacing of 60 kHz may not be applicable to all terminals, RMSI The candidate subcarrier spacing is only 15 kHz or 30 kHz. At this time, 2 bits of indication information I ₀ may be transmitted on the PBCH to indicate the subcarrier spacing of the RMSI and the PRB grid of the RMSI.

When the subcarrier spacing S ₁ of the SS is 15 kHz, the subcarrier spacing of the RMSI is S ₂ , and the meaning of each value of the indication information I ₀ can be as shown in Table 3 below:

table 3

I ₀ I ₀	S2S2
0000	15kHz15kHz
0101	30kHz且网格边界为候选位置130kHz and the grid boundary is candidate position 1
1010	30kHz且网格边界为候选位置230kHz and the grid boundary is candidate position 2
1111	ReservedReserved

The candidate positions in the table can be position 0 and position 1 as shown in Fig. 25(1). Candidate position 1 can be position 0, and candidate position 2 can be position 1; it can also be reversed.

The above locations can also be represented by frequency domain offsets, as shown in Table 4 below:

Table 4

I ₀ I ₀	S2S2
0000	15kHz,偏移0个PRB(子载波间隔为S1)15kHz, offset 0 PRB (subcarrier spacing is S1)
0101	30kHz,偏移0个PRB(子载波间隔为S1)30kHz, offset 0 PRB (subcarrier spacing is S1)
1010	30kHz,偏移1个PRB(子载波间隔为S1)30kHz, offset by 1 PRB (subcarrier spacing is S1)
1111	ReservedReserved

Or as shown in Table 5 below:

table 5

I ₀ I ₀	S2S2
0000	15kHz,偏移0个PRB(子载波间隔为S2)15kHz, offset 0 PRB (subcarrier spacing is S2)
0101	30kHz,偏移0个PRB(子载波间隔为S2)30kHz, offset 0 PRB (subcarrier spacing is S2)
1010	30kHz,偏移1/2个PRB(子载波间隔为S2)30kHz, offset 1/2 PRB (subcarrier spacing is S2)
1111	ReservedReserved

When the subcarrier spacing S ₁ of the SS is 30 kHz, the subcarrier spacing of the RMSI is S ₂ . When the subcarrier spacing S _{2 of the} RMSI is smaller than the subcarrier spacing S _{1 of the} SS, the PRB grid of the RMSI can be obtained according to the nesting relationship shown in FIG. At this time, the indication information I ₀ may be used only to indicate the subcarrier spacing, and the meaning of each value of the indication information I ₀ may be as shown in Table 6 below:

Table 6

I ₀ I ₀	S2S2
0000	15kHz15kHz
0101	30kHz 30kHz
1010	ReservedReserved
1111	ReservedReserved

The above location may be represented by a frequency domain offset, as shown in Table 7 or Table 8 below: since the number of PRBs offset at this time is 0, the indication information I ₀ may be used only to indicate the subcarrier spacing.

Table 7

I ₀ I ₀	S2S2
0000	15kHz,偏移0个PRB(子载波间隔为S1)15kHz, offset 0 PRB (subcarrier spacing is S1)
0101	30kHz,偏移0个PRB(子载波间隔为S1)30kHz, offset 0 PRB (subcarrier spacing is S1)
1010	ReservedReserved
1111	ReservedReserved

Table 8

I ₀ I ₀	S2S2
0000	15kHz,偏移0个PRB(子载波间隔为S2)15kHz, offset 0 PRB (subcarrier spacing is S2)
0101	30kHz,偏移0个PRB(子载波间隔为S2)30kHz, offset 0 PRB (subcarrier spacing is S2)
1010	ReservedReserved
1111	ReservedReserved

The offset in the table is the offset of the boundary B1 or B2 in the PRB grid D ₁ to the RPB grid D ₂ , and the frequency domain offset direction can be predefined from the low frequency domain position to the high frequency domain position offset or predefined from The high frequency domain position is shifted to the low frequency domain position, or 1 bit is used to indicate the direction of the offset. The unit of the offset may also be the number of subcarriers, and one PRB corresponds to 12 subcarriers.

It can be seen that in the present scheme, the candidate subcarrier spacing of the RMSI is two, and the indication information I ₀ includes a 2-bit information bit, which can be used to indicate the subcarrier spacing of the RMSI, or to indicate the subcarrier spacing and the PRB grid of the RMSI. ₂ the relative position between D ₁ and D PRB grid, this relative position may be offset in the frequency domain or grid PRB D ₁ a predetermined position on the boundary of the grid PRB of D _2.

Option 5: Joint PRB Grid indicating RMSI subcarrier spacing and RMSI.

The difference from scheme 4 is that the candidate subcarrier spacing of the RMSI is not limited. At this time, the indication information I ₀ includes a 3-bit information bit for indicating the subcarrier spacing of the RMSI and the relative position between the PRB grid D ₁ and the PRB grid D ₂ , which may be a frequency domain offset or a PRB. The position of a preset boundary of the grid D ₁ on the PRB grid D ₂ .

For the subcarrier spacing S _{1 of} different SSs, the interpretation of the value of the indication information I ₀ is different. When S ₁ is 15 kHz, the meaning of the indication information I ₀ is as shown in Table 9 below:

Table 9

I ₀ I ₀	S2S2
000000	15kHz15kHz
001001	30kHz且网格边界为候选位置030kHz and the grid boundary is the candidate position 0
010010	30kHz且网格边界为候选位置130kHz and the grid boundary is candidate position 1
011011	60kHz且网格边界为候选位置060 kHz and the grid boundary is the candidate position 0
100100	60kHz且网格边界为候选位置160 kHz and the grid boundary is the candidate position 1
101101	60kHz且网格边界为候选位置260 kHz and grid boundary is candidate position 2
110110	60kHz且网格边界为候选位置360 kHz and the grid boundary is the candidate position 3
111111	ReservedReserved

The candidate positions in the table where S ₂ is 30 kHz can be as shown in Fig. 25 (1), which are position 0 and position 1, respectively. Candidate position 0 can be position 0, candidate position 1 can be position 1; vice versa. And the candidate positions in the table where S ₂ is 60 kHz can be as shown in Fig. 26, which are positions 0-3. Candidate position 0 can be position 0, candidate position 1 can be position 1; candidate position 2 can be position 2, and candidate position 3 can be position 3. Of course, candidate positions 0-3 may also be in other forms for positions 0-3 in FIG. 26, and the application is not limited.

The above locations can be represented by frequency domain offsets, as shown in Table 10 or Table 11 below:

Table 10

Table 11

I ₀ I ₀	S2S2
000000	15kHz，偏移0个PRB(子载波间隔为S2)15kHz, offset 0 PRB (subcarrier spacing is S2)
001001	30kHz，偏移0个PRB(子载波间隔为S2)30kHz, offset 0 PRB (subcarrier spacing is S2)
010010	30kHz，偏移1/2个PRB(子载波间隔为S2)30kHz, offset 1/2 PRB (subcarrier spacing is S2)
011011	60kHz，偏移0个PRB(子载波间隔为S2)60kHz, offset 0 PRB (subcarrier spacing is S2)
100100	60kHz，偏移1/4个PRB(子载波间隔为S2)60kHz, offset by 1/4 PRB (subcarrier spacing is S2)
101101	60kHz，偏移1/2个PRB(子载波间隔为S2)60kHz, offset 1/2 PRB (subcarrier spacing is S2)
110110	60kHz，偏移3/4个PRB(子载波间隔为S2)60kHz, offset 3/4 PRB (subcarrier spacing is S2)
111111	ReservedReserved

When S ₁ is 30 kHz, the meaning of the indication information I ₀ is as shown in Table 12 below:

Table 12

I ₀ I ₀	S2S2
000000	15kHz15kHz
001001	30kHz30kHz
010010	60kHz且网格边界为候选位置160 kHz and the grid boundary is the candidate position 1
011011	60kHz且网格边界为候选位置260 kHz and grid boundary is candidate position 2
100100	ReservedReserved
101101	Reserved Reserved
110110	ReservedReserved
111111	ReservedReserved

The candidate positions in the table where S ₂ is 60 kHz can be as shown in Fig. 25 (2), which are position 0 and position 1, respectively. Candidate position 1 can be position 0, and candidate position 2 can be position 1; it can also be reversed.

The above locations can be represented by frequency domain offsets, as shown in Table 13 or 14 below:

Table 13

I ₀ I ₀	S2S2
000000	15kHz,偏移0个PRB(子载波间隔为S1)15kHz, offset 0 PRB (subcarrier spacing is S1)
001001	30kHz,偏移0个PRB(子载波间隔为S1)30kHz, offset 0 PRB (subcarrier spacing is S1)
010010	60kHz,偏移0个PRB(子载波间隔为S1)60kHz, offset 0 PRB (subcarrier spacing is S1)
011011	60kHz,偏移1个PRB(子载波间隔为S1)60kHz, offset by 1 PRB (subcarrier spacing is S1)
100100	ReservedReserved
101101	Reserved Reserved
110110	ReservedReserved
111111	ReservedReserved

Table 14

I ₀ I ₀	S2S2
000000	15kHz,偏移0个PRB(子载波间隔为S2)15kHz, offset 0 PRB (subcarrier spacing is S2)
001001	30kHz,偏移0个PRB(子载波间隔为S2)30kHz, offset 0 PRB (subcarrier spacing is S2)
010010	60kHz,偏移0个PRB(子载波间隔为S2)60kHz, offset 0 PRB (subcarrier spacing is S2)
011011	60kHz,偏移1/2个PRB(子载波间隔为S2)60kHz, offset 1/2 PRB (subcarrier spacing is S2)
100100	ReservedReserved
101101	Reserved Reserved
110110	ReservedReserved
111111	ReservedReserved

The offset in the table is the offset of the boundary B1 or B2 in the PRB grid D ₁ to the RPB grid D ₂ , and the frequency domain offset direction can be predefined from the low frequency domain position to the high frequency domain position offset or predefined from the high The frequency domain position is shifted to the low frequency domain position, or 1 bit is used to indicate the direction of the offset. The unit of the offset may also be the number of subcarriers, and one PRB corresponds to 12 subcarriers.

Scheme 6: Limiting the subcarrier spacing of the RMSI without adding extra bits, the indication of multiplexing the RMSI indicates the PRB grid of the RMSI.

The indication information of the RMSI is used to indicate the subcarrier spacing of the RMSI. The set of subcarrier spacing supported by different carrier frequency bands is limited. For example, in the carrier frequency band below 6 GHz, {15, 30, 60} kHz is supported, and on the carrier frequency band higher than 6 GHz, {120, 240} kHz is supported. Therefore, when the network device indicates the subcarrier spacing S ₂ of the RMSI to the terminal device, the requirement can be satisfied by using the 2-bit information bit. This scheme S ₂ by limiting the candidate subcarrier spacing set, the terminal notifies the data subcarrier spacing S ₂ corresponding to the grid D ₂ PRB without increasing the bit.

When the subcarrier spacing S ₁ of the SS is 15 kHz, the candidate subcarrier spacing set defining S ₂ is {15, 30} kHz, then the network device sends the indication information I ₀ to the terminal in the PBCH, and the terminal corresponds to the subcarrier spacing S1. PRB of D ₁ and the grid information indicating a subcarrier spacing I ₀ S ₂ determines a PRB corresponding to the grid D _2. The specific bit information of the indication information I _{0 is} as shown in Table 15 below:

Table 15

The candidate positions in the table where S ₂ is 30 kHz can be as shown in Fig. 25 (1), which are position 0 and position 1, respectively. Candidate position 1 can be position 0, and candidate position 2 can be position 1; it can also be reversed.

The above locations can be represented by frequency domain offsets, as shown in Table 16 or 17 below:

Table 16

Table 17

When the subcarrier spacing S ₁ of the SS block is 30 kHz, the specific bit information of the indication information I _{0 is} as shown in Table 18 below:

Table 18

I ₀ I ₀	S2S2
0000	15kHz15kHz
0101	30kHz 30kHz
1010	60kHz且网格边界为候选位置160 kHz and the grid boundary is the candidate position 1
1111	60kHz且网格边界为候选位置260 kHz and grid boundary is candidate position 2

The above locations can be represented by frequency domain offsets, as shown in Table 19 or 20 below:

Table 19

I ₀ I ₀	S2S2
0000	15kHz,偏移0个PRB(子载波间隔为S1)15kHz, offset 0 PRB (subcarrier spacing is S1)
0101	30kHz,偏移0个PRB(子载波间隔为S1)30kHz, offset 0 PRB (subcarrier spacing is S1)
1010	60kHz,偏移0个PRB(子载波间隔为S1)60kHz, offset 0 PRB (subcarrier spacing is S1)
1111	60kHz,偏移1个PRB(子载波间隔为S1)60kHz, offset by 1 PRB (subcarrier spacing is S1)

Table 20

I ₀ I ₀	S2S2
0000	15kHz,偏移0个PRB(子载波间隔为S2)15kHz, offset 0 PRB (subcarrier spacing is S2)
0101	30kHz,偏移0个PRB(子载波间隔为S2)30kHz, offset 0 PRB (subcarrier spacing is S2)
1010	60kHz,偏移0个PRB(子载波间隔为S2)60kHz, offset 0 PRB (subcarrier spacing is S2)
1111	60kHz,偏移1/2个PRB(子载波间隔为S2)60kHz, offset 1/2 PRB (subcarrier spacing is S2)

The offset in the table is the offset of the boundary B1 or B2 in the PRB grid D ₁ (corresponding to the subcarrier spacing S ₁ ) to the RPB grid D ₂ (corresponding to the subcarrier spacing S ₂ ), and the frequency domain offset direction can be pre- Defining the offset from the low frequency domain position to the high frequency domain position or pre-defining from the high frequency domain position to the low frequency domain position, or using 1 bit to indicate the direction of the offset, the unit of the offset may also be the number of subcarriers, one The PRB corresponds to 12 subcarriers.

Optionally, the network device may notify the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band in the RMSI or RRC message.

After receiving RMSI terminal, a network device may in RMSI or higher layer signaling, such as RRC message, sending indication information indicating at least a maximum support of the sub-carrier frequency of one carrier spacing S ₃ corresponding to PRB grid, the sub The carrier spacing can be a subcarrier spacing for transmitting data and/or control information. For example, in a frequency band below 6 GHz, a PRB grid of 60 kHz is indicated; in a frequency band higher than 6 GHz, no indication is needed, because in a frequency band higher than 6 GHz, the candidate subcarrier spacing of the SS is {120, 240} kHz, The set of subcarrier spacing candidates for data and/or control information is {60, 120} kHz, and the subcarrier spacing for data and/or control information is not greater than the subcarrier spacing of the SS.

The indication information indicates a frequency domain offset between the PRB grid corresponding to the subcarrier spacing S ₃ and the known PRB grid, and the known PRB grid may be a PRB grid corresponding to the subcarrier spacing S ₁ , the subcarrier The interval S ₁ may be a subcarrier spacing of the SS or may be the same subcarrier spacing for data and/or control information transmission as the SS subcarrier spacing; or the known PRB grid may be a subcarrier spacing corresponding to the RMSI The PRB grid, or other PRB grid corresponding to the known subcarrier spacing, is known to mean that the network device and the terminal understand.

Optionally, the indication information may include a 2-bit information bit, that is, a 2-bit information bit may be used to indicate a PRB grid corresponding to a maximum sub-carrier spacing supported by the carrier frequency band. For example, the predefined known PRB grid is an RPB grid with the same subcarrier spacing for data transmission as the SS subcarrier spacing. If the subcarrier spacing of the SS is 15 kHz, then “00” indicates that the frequency domain offset is 0. "01" indicates that the frequency domain offset is 1/4 PRB or 3 subcarriers, "10" indicates that the frequency domain offset is 1/2 PRB or 6 subcarriers, and "11" indicates that the frequency domain offset is 3/. 4 PRBs or 9 subcarriers, the subcarrier spacing corresponding to the PRB or subcarrier is the maximum subcarrier spacing supported by the current carrier frequency band. Or "00" indicates that the frequency domain offset is 0, "01" indicates that the frequency domain offset is 1 PRB or 12 subcarriers, "10" indicates that the frequency domain offset is 2 PRBs or 24 subcarriers, and "11" indicates The frequency domain offset is 3 PRBs or 36 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the subcarrier spacing of the SS.

If the subcarrier spacing of the SS is 30 kHz, then "00" indicates that the frequency domain offset is 0, and "01" indicates that the frequency domain offset is half PRB or 6 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is current. The maximum subcarrier spacing supported by the carrier band. Or "00" indicates that the frequency domain offset is 0, and "01" indicates that the offset is 1 PRB or 12 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the same as the subcarrier spacing of the SS.

Frequency domain offset direction may be predefined subcarrier spacing S ₁ PRB corresponding to a predetermined grid or a predetermined boundary position shifted from the low frequency to the high frequency domain position-domain position sense subcarrier spacing S ₁ PRB corresponding to a grid The preset boundary position is shifted from the high frequency domain position to the low frequency domain position, or 1 bit is used to indicate the direction of the offset.

In the above solution, the subcarrier spacing of the SS is the subcarrier spacing of the SS block.

Optionally, the preset boundary in the foregoing solution may be a data and/or a controlled PRB corresponding to the SS block subcarrier spacing after the SS block center frequency is shifted to the low frequency domain position or the high frequency domain position by a certain number of subcarriers. The boundaries of the grid alignment are B1 in Figure 25 and B2 in Figure 26.

Please refer to FIG. 15 , which is a schematic diagram of an initial access network of a terminal according to an embodiment of the present application. As shown in FIG. 15, the process of the terminal initially accessing the network includes the following steps:

S151: The network device sends an SS block, where the SS block includes an SS and a PBCH. That is, the network device transmits the SS and broadcasts the information on the PBCH.

S152: The terminal detects the SS. When the SS is detected, the frequency domain position of the PBCH is determined according to the center frequency of the SS and the subcarrier spacing of the SS. For example, 24 PRBs centered on the center frequency of the SS are frequency domain locations of the PBCH, and the PRBs correspond to subcarrier spacings where the subcarrier spacing is SS. In this way, the terminal can receive information on the PBCH in the frequency domain location of the PBCH.

S154: The network device sends the RMSI.

S155: The terminal receives the RMSI, where the information on the PBCH includes the information of the frequency domain location of the scheduling information of the RMSI, and the terminal may determine the frequency domain location of the scheduling information of the RMSI according to the information on the PBCH, and then receive the scheduling of the RMSI according to the frequency domain location. information. The scheduling information of the RMSI is used to indicate the frequency domain location where the RMSI is located, and the terminal receives the RMSI according to the scheduling information of the RMSI.

The information on the PBCH includes resource information of the downlink control channel, and the resource of the downlink control channel is, for example, a control resource set (CORESET). The resource information may be frequency domain indication information for indicating a frequency domain location of the CORESET. For example, the resource information includes CORESET offset indication information and a size of CORESET. The CORESET offset indication information is used to indicate a frequency domain offset of the CORESET relative to the reference point, and the reference point may be a lowest, center, or highest frequency domain position of the SS (or SS block), the CORESET offset value being CORESET The frequency domain offset value of the lowest, center, or highest frequency domain position relative to the reference point. The CORESET is used for terminal blind detection control information, for example, information carried on a physical downlink control channel (PDCCH), where the PDCCH includes a common search space for carrying public information, for example, scheduling including RMSI. information. The terminal acquires the location of the CORESET, and then detects the downlink control information according to the location of the CORESET, acquires the scheduling information of the RMSI, and obtains the resource location where the RMSI is located according to the scheduling information of the RMSI, thereby receiving the RMSI. The RMSI includes resource information of random access, and after the terminal receives the RMSI, the random access procedure can be started (S156).

In the above process, if the information of the frequency domain location of the scheduling information of the RMSI in the PBCH is the number of offset PRBs, and the subcarrier spacing corresponding to the PRB is the subcarrier spacing of the SS, it may be implicitly in this manner. The lowest frequency domain position for obtaining CORESET is aligned with the PRB grid boundary corresponding to the CORESET.

For example, in the initial access process, the subcarrier spacing of the RMSI is 30 kHz, and the subcarrier spacing of the SS is 15 kHz. When the frequency domain position of the CORESET is indicated, the PRB of the 15 kHz is used as the granularity, indicating the center frequency position of the CORESET and the SS. The offset between the center frequency positions is 7 PRBs and the size of the CORESET is 10 PRBs. Then the terminal can think that the lowest frequency domain position of the 10 PRBs of CORESET is aligned with the 30 kHz PRB grid boundary.

The concept of a wideband carrier (wideband BW CC, also known as a wideband CC) is introduced in the NR communication system. The broadband carrier is a carrier whose carrier bandwidth (BW) is greater than or equal to a preset bandwidth, for example, 100 MHz. The wideband carrier can allow different terminals to access the carrier through different SSs (or SS blocks), where different SSs refer to different frequency domain locations, that is, SSs transmitted in different frequency domain locations. That is to say, on the broadband carrier, the network device can send multiple SS blocks, and the SS in each SS block can allow one or more terminals to access the carrier, and different terminals can be connected through SS in different SS blocks. Go to this carrier. At this time, there will be a case where the grids of the PRBs are not aligned when the different terminals determine the resources of the PBCH.

Please refer to FIG. 16 , which is a schematic diagram of transmitting different SSs on a wideband carrier according to an embodiment of the present application. Assuming that the first SS is transmitted at location 161 and the second SS is transmitted at location 162, location 162 is not aligned with the boundary of the PRB grid, so for terminals that detect SS at location 162, their understanding and location of the PRB grid 161. The terminal that detects the SS has an inconsistent understanding of the PRB grid. Therefore, the terminal that accesses the carrier through different SSs cannot access the carrier. For example, the terminal that detects the SS at the location 162 cannot accurately determine the resource location of the PBCH. Therefore, the carrier cannot be accessed. The case shown in Fig. 17 will be described below as an example.

FIG. 17 is a schematic diagram of different terminals accessing the same carrier through different SSs according to an embodiment of the present disclosure. In Fig. 17, the description is made by taking an example in which the size of the SS grid is 100 kHz and the subcarrier spacing of the PRB is 15 kHz. The network device transmits a first SS at location 171 of the SS grid in the figure, and a second SS is transmitted at location 172 of the SS grid in the figure. The terminal 173 and the terminal 174 detect the SS according to the SS grid, and the terminal 173 detects the first SS at the position 171 of the SS grid, and determines the PRB grid according to the center frequency of the first SS, thereby determining the resource location of the PBCH. The terminal 174 detects the second SS at the location 172 of the SS grid and determines the PRB grid based on the center frequency of the second SS to determine the resource location of the PBCH. However, if the PRB grid determined by the position 171 of the SS grid is used as a reference, then for the terminal 174, there may be cases where the PRB grid is not aligned. As shown in FIG. 17, the PRB grid boundaries determined by the terminal 173 and the terminal 174 are not aligned. It can be seen that the understanding of the PRB grid by the terminal 173 and the terminal 174 is inconsistent. Therefore, there must be an inconsistency between the terminal and the network device for the PRB grid. For example, if the terminal is the terminal 174, the terminal 174 cannot correctly determine the resource location of the PBCH, and thus cannot correctly receive the MIB, so that the carrier cannot be accessed.

In view of the above problems, the embodiment of the present application proposes a communication method such that the frequency offset between the center frequencies of different SSs is a positive integer multiple of the smallest common multiple of the SS grid size and the PRB size, thus using different SS accesses. When the terminal of the same carrier determines the PRB grid according to the center frequency of the SS, the understanding of the PRB grid is consistent, and the MIB can be correctly received, thereby accessing the carrier. Description will be made below with reference to the drawings.

Please refer to FIG. 18 , which is a schematic diagram of a communication method according to an embodiment of the present application. The method is used to solve the problem that some terminals cannot access the carrier when the different terminals access the carrier through different SSs on different carriers on the same carrier. As shown in FIG. 18, the method includes:

S181: The network device sends the first SS on the carrier, where the center frequency of the first SS is located at the first position of the SS grid.

S182: When there is a second SS to be sent, the network device sends a second SS on the carrier, where a center frequency of the second SS is located at a second location of the SS grid.

The network device uses the same subcarrier spacing when transmitting the SS on the same carrier, that is, the first SS and the second SS are transmitted using the same subcarrier spacing. And the frequency offset between the second location and the first location is a positive integer multiple of the least common multiple of the SS grid size and the PRB size, where the PRB size is the subcarrier spacing used to send the first SS and the second SS (below) The product of the subcarrier spacing of the SS is collectively referred to as the number of subcarriers included in the PRB. That is, when there is a second SS to be sent, the network device does not directly send the second SS at the location of the next SS grid, or does not randomly select a location of the SS grid to send the second SS, but with the first location. The second SS is transmitted on the second position where the frequency offset satisfies the preset condition. The preset condition is related to the SS grid size and the subcarrier spacing of the SS, that is, the frequency offset between the second location and the first location is a positive integer multiple of the least common multiple of the SS raster size and the PRB size, wherein the PRB size Related to the subcarrier spacing.

S183: The terminal detects the SS according to the SS grid.

When the SS is detected, the terminal acquires downlink synchronization with the cell according to the SS, thereby acquiring system information (S184); then, according to the system information, random access is initiated, so that the random access procedure can be started (S185).

In the above step S181, the network device sends a first SS block, where the first SS block includes a first SS and a first PBCH, where the first SS includes a PSS and an SSS, that is, the network device sends the first SS and is at the first Broadcast information on the PBCH. In the frequency domain, the center frequency of the first SS and the center frequency of the first PBCH are located at a first position of the SS grid. In the time domain, the network device may periodically transmit the first SS at the first location and broadcast the information on the first PBCH.

In the above step S182, the network device sends a second SS block, where the second SS block includes a second SS and a second PBCH, where the second SS includes the PSS and the SSS, that is, the network device sends the second SS and is in the second Broadcast information on the PBCH. The PSS/SSS of the first SS and the PSS/SSS of the second SS may be the same SS sequence, but the frequency domain positions are different. In the frequency domain, the center frequency of the second SS and the center frequency of the second PBCH are located at the second position of the SS grid. In the time domain, the network device can periodically transmit the second SS at the second location and broadcast the information on the second PBCH.

When there may be multiple SSs on a carrier for the terminal to access the carrier, in order to make the PRB grids determined by different terminals according to different SSs aligned, that is, the understanding of the PRB grid is consistent, in the above embodiment. The frequency offset between the different SS center frequencies (ie, the frequency offset between the second location and the first location) is limited to a positive integer multiple of the least common multiple of the SS grid size and the PRB size. The following takes an example of different SS grid size and subcarrier spacing size as an example.

Please refer to FIG. 19 , which is a schematic diagram of different terminals accessing the same carrier through different SSs according to an embodiment of the present application. Assuming that the size of the SS grid is 100 kHz and the subcarrier spacing of the SS is 15 kHz, the size of the PRB is 15*12 kHz, ie 180 kHz. The least common multiple of 100 and 180 is 900, and the frequency offset between the center frequencies of different SSs in one carrier (or the location of the SS grid in which it is located) is 900*n kHz, where n is a positive integer. At this time, the terminal 193 detecting the SS from the SS grid first position 191 and the terminal 194 detecting the SS from the SS grid second position 192 are consistent in understanding the PRB grid, and therefore, both the terminal 93 and the terminal 194 are The MIB can be correctly received and then accessed to the carrier.

Assuming that the SS grid size is 100 kHz and the SS subcarrier spacing is 30 kHz, the PRB size is 30*12 kHz, or 360 kHz. The least common multiple of 100 and 180 is 1800, and the frequency offset between the center frequencies of different SSs in one carrier (or the location of the SS grid in which it is located) is 1800*n kHz, where n is a positive integer.

Assuming that the size of the SS grid is 180 kHz and the subcarrier spacing of the SS is 15 kHz, the size of the PRB is 15*12 kHz, ie 180 kHz. Then the frequency offset between the center frequencies of the different SSs in one carrier (or the location of the SS grid in which they are located) is 180*n kHz, where n is a positive integer. At this time, the size of the PRB and the size of the SS grid are the same, so the least common multiple is 180 kHz. It can also be understood that there is no need to limit the frequency offset between different SS center frequencies, and the network device can transmit the SS at any two SS grid locations. When the size of the SS grid is 180 kHz, assuming that the subcarrier spacing of the SS is 30 kHz, the size of the PRB is 30*12 kHz, that is, 360 kHz. The least common multiple of 180 and 360 is 360, and the frequency offset between the center frequencies of different SSs in one carrier (or the location of the SS grid in which it is located) is 360*n kHz, where n is a positive integer.

Assuming that the size of the SS grid is 720 kHz and the subcarrier spacing of the SS is 120 kHz, the size of the PRB is 120*12 kHz, which is 1440 kHz. The least common multiple of 720 and 1440 is 1440, and the frequency offset between the center frequencies of different SSs in one carrier (or the location of the SS grid in which it is located) is 1440*n kHz, where n is a positive integer. When the size of the SS grid is 720 kHz, assuming that the subcarrier spacing of the SS is 240 kHz, the size of the PRB is 240*12 kHz, that is, 2880 kHz. The least common multiple of 720 and 2880 is 2880, and the frequency offset between the center frequencies of different SSs in one carrier (or the location of the SS grid in which it is located) is 2880*n kHz, where n is a positive integer.

An example of several SS grid sizes and subcarrier spacing sizes is given above, and the conditions under which the frequency offset between the center frequencies of different SSs are satisfied in the case of corresponding sizes are described. These examples are only for the convenience of understanding the present embodiment and are not intended to limit the application. Those skilled in the art can implement SS transmission of various SS grid and subcarrier spacing combinations according to the above embodiments.

In the above step S183, some terminals may detect the SS at the first location, and some terminals may detect the SS at the second location. The terminal that detects the SS in the first location is the first terminal, and the first terminal may have one or more; the terminal that detects the SS in the second location is the second terminal, and the second terminal may have one or more One.

In the above step S184, the system information acquired by the terminal may include MIB and RMSI. When the terminal is the first terminal, the first terminal detects the first SS in the first position of the SS grid, and determines the resource location of the first PBCH according to the first SS, for example, the center frequency of the first SS is 24 PRBs in the center. The first MIB sent by the network device is then received on the first PBCH. When the terminal is the second terminal, the second terminal detects the second SS in the second position of the SS grid, and determines the resource location of the second PBCH according to the second SS, for example, the center frequency of the second SS is 24 PRBs in the center. The second MIB sent by the network device is then received on the second PBCH.

Any of the above MIBs may include resource information, where the resource information is used to indicate the resource location of the control channel where the RMSI scheduling information is located. After the terminal correctly parses the MIB, the terminal receives the RMSI scheduling information sent by the network device according to the resource information in the MIB, and further The RMSI scheduling information receives the RMSI and initiates random access based on the RMSI to access the carrier.

In an implementation, the resource information of the downlink control channel is carried on the PBCH, and the resource of the downlink control channel is, for example, a control resource set (CORESET). The resource information may be frequency domain indication information for indicating a frequency domain location of the CORESET. Optionally, the resource information includes a CORESET offset value and a size of the CORESET. The CORESET offset value is used to indicate the frequency offset of the CORESET relative to the reference point, and the reference point may be the lowest, center, or highest frequency domain position of the SS (or SS block), the CORESET offset value being the lowest of the CORESET, The center, or the frequency offset of the highest frequency domain position relative to the reference point. The CORESET is used for terminal blind detection control information, for example, information carried on a physical downlink control channel (PDCCH), where the PDCCH includes a common search space for carrying public information, for example, scheduling including RMSI. information. The terminal acquires the location of the CORESET according to the MIB, and further detects the downlink control information according to the location of the CORESET, acquires the scheduling information of the RMSI, and obtains the resource location where the RMSI is located according to the scheduling information of the RMSI, thereby receiving the RMSI. After the terminal receives the RMSI, the random access procedure can be started.

For example, the first terminal determines, according to the first resource information in the first MIB, a resource location of a control channel where the first RMSI scheduling information is located. Then, the first RMSI scheduling information is received on the control channel, and then the resource location where the first RMSI is located is determined according to the first RMSI scheduling information, and the first RMSI is received at the determined resource location. Similarly, the second terminal determines, according to the second resource information in the second MIB, a resource location of a control channel where the second RMSI scheduling information is located. Then, the second RMSI scheduling information is received on the control channel, and then the resource location where the second RMSI is located is determined according to the second RMSI scheduling information, and the second RMSI is received at the determined resource location.

It can be seen that when the terminal accesses the carrier, the SS is first blindly detected, the frequency domain location of the PBCH is determined according to the detected SS, and the MIB carried on the PBCH is received in the determined frequency domain location. The MIB includes information of a CORESET for transmitting downlink control information, and the terminal determines a frequency domain location of the CORESET according to the information, and further receives control information carried on the PDCCH in the determined frequency domain location. The control information includes scheduling information of the RMSI, and the terminal determines the frequency domain location of the RMSI on the physical downlink shared channel (PDSCH) according to the scheduling information of the RMSI. In turn, the terminal can receive the RMSI at a determined frequency domain location. The RMSI can carry random access information, and the terminal can initiate random access according to the RMSI.

In the above embodiment, the size of the SS grid and the subcarrier spacing of the SS determine the frequency offset between the center frequencies of different SSs; or the size of the SS grid and the subcarrier spacing of the SS determine the transmission of different SSs. The frequency offset between the positions of the SS grids. In another implementation manner provided by the embodiment of the present application, the size of the SS grid and the subcarrier spacing of the SS are determined by the carrier frequency, and the size of the SS grid is the positive of the size of the PRB corresponding to the subcarrier spacing of the SS. Integer multiple. In this way, no matter which SS location is sent by different SSs, the terminal that detects the different SSs has the same understanding of the PRB grid, so that the above frequency domain location restriction can be adopted, so that the access is through different SSs. A terminal of the same carrier can correctly receive system information and access the carrier.

Please refer to FIG. 20 , which is a schematic diagram of another communication method provided by an embodiment of the present application. The method is used to solve the problem that some terminals cannot access the carrier when the different terminals access the carrier through different SSs on different carriers on the same carrier. As shown in FIG. 20, the method includes:

S201: The network device determines, according to the frequency of the carrier, a size of the SS grid and a subcarrier spacing of the SS.

S202: The network device sends the SS on the carrier by using the determined subcarrier spacing, where a center frequency of the SS is located at a position of the SS grid, and a distance between two adjacent locations of the SS grid is Determine the size of the SS grid.

Correspondingly, please refer to FIG. 21 , which is a schematic diagram of another communication method provided by an embodiment of the present application. The method is used to solve the problem that some terminals cannot access the carrier when the different terminals access the carrier through different SSs on different carriers on the same carrier. As shown in FIG. 21, the method includes:

S211: The terminal determines the size of the SS grid and the subcarrier spacing of the SS according to the frequency of the carrier, where the size of the SS grid is a positive integer multiple of the PRB size, and the PRB size is the subcarrier spacing of the SS and the subcarrier included in the PRB. Product of quantity;

S212: The terminal detects the SS on the carrier according to the SS grid using the subcarrier spacing of the SS, where the distance between two adjacent locations of the SS grid is the determined size of the SS grid, and the center frequency of the SS is located in the SS. A position of the grid.

Optionally, in the above embodiment, the size of the SS grid is equal to the PRB size corresponding to the subcarrier spacing of the SS. For example, Table 2 below shows the subcarrier spacing of the SS and the size of the SS grid at several carrier frequencies, so that no matter which SS location is sent by the different SS, the terminal of the different SS is detected to the PRB network. The understanding of the cells is consistent, so that the above-mentioned frequency domain location restriction can be adopted, so that terminals accessing the same carrier through different SSs can correctly receive system information and access the carrier.

Table 2

载波频率fCarrier frequency f	SS的子载波间隔SS subcarrier spacing	SS栅格SS grid
f<3GHzf<3GHz	15kHz15kHz	180kHz180kHz
3GHz<f<6GHz3GHz<f<6GHz	30kHz30kHz	360kHz360kHz

The embodiment shown in FIG. 18, FIG. 20 and FIG. 21 can be combined with the foregoing embodiment, that is, when the transmission of different SSs is supported on the carrier, the above method can be adopted to enable the terminal accessing the carrier through different SSs to the PRB grid. Understand the same. And through the method of the above embodiment, the terminal correctly acquires the PRB grid for performing data/control information transmission, thereby performing correct data/control information transmission and reception.

The embodiment of the present application further provides an apparatus for implementing any of the above methods, for example, providing an apparatus including a unit (or means) for implementing various steps performed by a terminal in any of the above methods. As another example, another apparatus is provided, including means (or means) for implementing the various steps performed by the network device in any of the above methods.

It should be understood that the division of the units in the device is only a division of logical functions, and the actual implementation may be integrated into one physical entity in whole or in part, or may be physically separated. The units in the device may all be implemented by software in the form of processing component calls; or may be implemented entirely in hardware; some units may be implemented in software in the form of processing component calls, and some units may be implemented in hardware. For example, the unit may be a separate processing element, or may be integrated in one of the devices of the device, or may be stored in a memory in the form of a program, which is called by a processing element of the device and performs the function of the unit. . The implementation of other units is similar. In addition, all or part of these units can be integrated or implemented independently. The processing elements described herein can be an integrated circuit that has signal processing capabilities. In the implementation process, each step of the above method or each of the above units may be completed by an integrated logic circuit of hardware in the processor element or an instruction in a form of software.

For example, a unit in a device may be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors ( Digital singnal processor (DSP), or one or more Field Programmable Gate Array (FPGA). As another example, when a unit in a device can be implemented in the form of a processing component scheduler, the processing element can be a general purpose processor, such as a central processing unit (CPU) or other processor that can invoke the program. As another example, these units can be integrated and implemented in the form of a system-on-a-chip (SOC).

Please refer to FIG. 22, which is a schematic structural diagram of a network device according to an embodiment of the present application, for implementing the operation of the network device in the foregoing embodiment. As shown in FIG. 22, the network device includes an antenna 221, a radio frequency device 222, and a baseband device 223. The antenna 221 is connected to the radio frequency device 221. In the uplink direction, the radio frequency device 222 receives the information transmitted by the terminal through the antenna 221, and transmits the information transmitted by the terminal to the baseband device 223 for processing. In the downlink direction, the baseband device 223 processes the information of the terminal and sends it to the radio frequency device 222. The radio frequency device 222 processes the information of the terminal and sends it to the terminal through the antenna 221.

The above means for the network device may be located in the baseband device 223. In one implementation, the unit of the network device implementing the various steps in the above method may be implemented in the form of a processing component scheduler, for example, the baseband device 223 includes the processing component 2231 and the storage component. 2232, processing component 2231 invokes a program stored by storage component 2232 to perform the method performed by the network device in the above method embodiments. In addition, the baseband device 223 may further include an interface 2233 for interacting with the radio frequency device 222, such as a common public radio interface (CPRI).

In another implementation, the unit of the network device implementing the various steps in the above method may be configured as one or more processing elements, and the processing elements are disposed on the baseband device 223, where the processing element may be an integrated circuit, for example: One or more ASICs, or one or more DSPs, or one or more FPGAs, etc. These integrated circuits can be integrated to form a chip.

These units can be integrated together in the form of a system-on-a-chip (SOC), for example, the baseband device 223 includes a SOC chip for implementing the above method. The processing element 2231 and the storage element 2232 may be integrated into the chip, and the method executed by the above network device may be implemented by the processing element 2231 in the form of a stored program of the storage element 2232; or, at least one integrated circuit may be integrated into the chip for implementation. The above network device performs the method; or, in combination with the above implementation manner, the functions of the partial units are implemented by the processing component calling program, and the functions of the partial units are implemented by the form of an integrated circuit.

Regardless of the manner, in summary, the above apparatus for a network device includes at least one processing element and a storage element, wherein at least one processing element is used to perform the method performed by the network device provided by the above method embodiments. The processing element may perform some or all of the steps performed by the network device in the above method embodiment in a manner of calling the program stored in the storage element; or in a second manner: by hardware in the processor element The integrated logic circuit performs some or all of the steps performed by the network device in the foregoing method embodiment in combination with the instructions; of course, some or all of the steps performed by the network device in the foregoing method embodiment may be performed in combination with the first mode and the second mode. .

The processing elements herein are the same as described above, and may be a general purpose processor, such as a Central Processing Unit (CPU), or may be one or more integrated circuits configured to implement the above method, for example: one or more specific An Application Specific Integrated Circuit (ASIC), or one or more digital singnal processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

The storage element can be a memory or a collective name for a plurality of storage elements.

Please refer to FIG. 23 , which is a schematic structural diagram of a terminal according to an embodiment of the present application. It can be the terminal in the above embodiment, and is used to implement the operation of the terminal in the above embodiment. As shown in FIG. 23, the terminal includes an antenna, a radio frequency device 231, and a baseband device 232. The antenna is connected to the radio frequency device 231. In the downlink direction, the radio frequency device 231 receives the information transmitted by the network device through the antenna, and transmits the information sent by the network device to the baseband device 232 for processing. In the uplink direction, the baseband device 232 processes the information of the terminal and sends the information to the radio frequency device 231. The radio frequency device 231 processes the information of the terminal and sends the information to the network device through the antenna.

The baseband device can include a modem subsystem for effecting processing of the various communication protocol layers of the data. A central processing subsystem may also be included for implementing processing of the terminal operating system and the application layer. In addition, other subsystems, such as a multimedia subsystem, a peripheral subsystem, etc., may be included, wherein the multimedia subsystem is used to implement control of the terminal camera, screen display, etc., and the peripheral subsystem is used to implement connection with other devices. The modem subsystem can be a separately set chip. Alternatively, the processing device of the above frequency domain resources can be implemented on the modem subsystem.

In one implementation, the means for the terminal to implement the various steps of the above methods may be implemented in the form of a processing component scheduler, such as a subsystem of baseband device 232, such as a modem subsystem, including processing component 2321 and storage component 2322, Processing component 2321 invokes a program stored by storage component 2322 to perform the method performed by the terminal in the above method embodiments. In addition, the baseband device 232 can also include an interface 2323 for interacting with the radio frequency device 231.

In another implementation, the unit that implements each step in the above method may be configured as one or more processing elements disposed on a certain subsystem of the baseband device 232, such as a modem subsystem. The processing elements herein may be integrated circuits, such as one or more ASICs, or one or more DSPs, or one or more FPGAs or the like. These integrated circuits can be integrated to form a chip.

For example, the units that implement the various steps in the above methods may be integrated and implemented in the form of a system-on-a-chip (SOC). For example, the baseband device 232 includes a SOC chip for implementing the above method. The processing element 2321 and the storage element 2322 may be integrated into the chip, and the method executed by the above terminal may be implemented by the processing element 2321 calling the stored program of the storage element 2322; or, at least one integrated circuit may be integrated in the chip for implementing the above The method executed by the terminal; or, in combination with the above implementation manner, the functions of the partial units are implemented by the processing component calling program, and the functions of the partial units are implemented by the form of an integrated circuit.

Regardless of the manner, in summary, the above apparatus for a terminal includes at least one processing element and a storage element, wherein at least one processing element is used to perform the method of terminal execution provided by the above method embodiments. The processing element may perform some or all of the steps performed by the terminal in the above method embodiment in a manner of scheduling the program stored by the storage element in the first manner; or in a second manner: through integration of hardware in the processor element The logic circuit performs some or all of the steps performed by the terminal in the foregoing method embodiment in combination with the instruction; of course, some or all of the steps performed by the terminal in the foregoing method embodiment may be performed in combination with the first mode and the second mode.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Claims

A communication method comprising:

The terminal receives the synchronization signal from the network device;

Determining, by the terminal, a first physical resource block grid according to the synchronization signal;

The terminal receives the first indication information from the network device, where the first indication information is used to indicate a first frequency offset between the first physical resource block grid and the second physical resource block grid;

Determining, by the terminal, the second physical resource block grid according to the first physical resource block grid and the first frequency offset.
The method according to claim 1, wherein the subcarrier spacing of the second physical resource block grid is the same as the subcarrier spacing of the synchronization signal.
The method according to claim 1 or 2, wherein the receiving, by the terminal, the first indication information from the network device comprises:

The terminal receives the first indication information through a physical broadcast channel PBCH.
The method according to any one of claims 1 to 3, wherein the first indication information is used to indicate a frequency offset value, wherein the first physical resource block grid is opposite to the second physical resource block The offset direction of the grid is predefined or indicated by the second indication information; or,

The first indication information is used to indicate a frequency offset value and an offset direction of the first physical resource block grid relative to the second physical resource block grid.
The method according to any one of claims 1 to 4, further comprising:

The terminal receives the third indication information from the network device, where the third indication information is used to indicate a second frequency offset between the second physical resource block grid and the third physical resource block grid, where The subcarrier spacing of the third physical resource block grid is greater than the subcarrier spacing of the synchronization signal;

The terminal determines the third physical resource block grid according to the second physical resource block grid and the second frequency offset.
The method according to claim 5, wherein the receiving, by the terminal, the third indication information from the network device comprises:

Receiving, by the terminal, the third indication information by using a physical broadcast channel PBCH; or

Receiving, by the terminal, remaining minimum system information RMSI, where the RMSI carries the third indication information; or

The terminal receives a radio resource control RRC message, where the RRC message carries the third indication information.
A communication method comprising:

The network device sends a synchronization signal to the terminal according to the first physical resource block grid;

The network device sends first indication information to the terminal, where the first indication information is used to indicate a first frequency offset between the first physical resource block grid and the second physical resource block grid;

And the network device performs information transmission with the terminal according to the second physical resource block grid.
The method according to claim 7, wherein the subcarrier spacing of the second physical resource block grid is the same as the subcarrier spacing of the synchronization signal.
The method according to claim 7 or 8, wherein the sending, by the network device, the first indication information to the terminal comprises:

The network device sends the first indication information through a physical broadcast channel PBCH.
The method according to any one of claims 7-9, wherein the first indication information is used to indicate a frequency offset value, wherein the first physical resource block grid is opposite to the second physical resource block The offset direction of the grid is predefined or indicated by the second indication information; or,

The first indication information is used to indicate a frequency offset value and an offset direction of the first physical resource block grid relative to the second physical resource block grid.
The method according to any one of claims 7 to 10, further comprising:

The network device sends third indication information to the terminal, where the third indication information is used to indicate a second frequency offset between the second physical resource block grid and the third physical resource block grid, where The subcarrier spacing of the third physical resource block grid is greater than the subcarrier spacing of the synchronization signal;

The network device performs information transmission with the terminal according to the third physical resource block grid.
The method according to claim 11, wherein the sending, by the network device, the third indication information to the terminal comprises:

Transmitting, by the network device, the third indication information by using a physical broadcast channel PBCH; or

Transmitting, by the network device, residual minimum system information RMSI, where the RMSI carries the third indication information; or

The network device sends a radio resource control RRC message, where the RRC message carries the third indication information.
A communication device comprising means or means for performing the various steps of any one of claims 1 to 6.
A communication device comprising means or means for performing the various steps of any one of claims 7 to 12.
A communication device comprising at least one processing element for storing a program and data, and at least one storage element for performing the method of any one of claims 1 to 6 Methods.
A communication device comprising at least one processing element for storing a program and data, and at least one storage element for performing the method of any one of claims 7 to 12 Methods.
A computer storage medium having stored thereon a computer program for performing the method of any one of claims 1 to 12 when executed by a processor.
A communication method comprising:

The terminal determines the first physical resource block PRB grid D 1 , wherein the subcarrier spacing corresponding to the first PRB grid D 1 is the first subcarrier spacing S 1 ;

The network terminal device receives indication information from a first I 3, the first indication information for indicating the first PRB D grid frequency between a first and a second 21 mesh PRB offset F 2 D The subcarrier spacing corresponding to the second PRB grid D 2 is a second subcarrier spacing S 2 , and the second subcarrier spacing S 2 is greater than the first subcarrier spacing S 1 ;

1 and the terminal according to the first frequency of the first grid PRB offset D F 2, determining a second grid PRB D 2.
The method of claim 18, further comprising:

Receiving, by the terminal, a synchronization signal from the network device;

Determining, by the terminal, the third PRB grid G 0 according to the synchronization signal;

The terminal receives the second indication information I 1 from the network device, where the second indication information I 1 is used to indicate the third between the third PRB grid G 0 and the first PRB grid D 1 Two frequency offsets F 1 .
The method according to claim 19, wherein said first terminal determines PRB grid D 1, comprising:

The PRB terminal according to the third grid G 0 and the second frequency offset F 1, determines the first PRB mesh D 1.
The method according to claim 19 or claim 20, characterized in that the terminal received from the second network device indicating information I 1, comprising:

The terminal receives the second indication information I 1 through a physical broadcast channel PBCH.
Method according to any of the claims 18-21, characterized in that the first subcarrier spacing S 1 is 15 kHz or 60 kHz.
The method according to any one of claims 18-22, wherein the terminal device receives information from the network indicating a first I 3, comprising:

The terminal receives remaining minimum system information RMSI from the network device, the RMSI carrying the first indication information I 3 .
The method of any of claims 18-23, further comprising:

The information transmission terminal according to the second grid PRB D 2 and the network device.
A communication method comprising:

A first network device sends indication information to the terminal I 3, the first indication information for indicating a first PRB and a second grid. 1 D D of the first PRB grid frequency offset between the 2 F 2, for determining The second PRB grid D 2 , wherein the subcarrier spacing corresponding to the first PRB grid D 1 is a first subcarrier spacing S 1 , and the subcarrier spacing corresponding to the second PRB grid D 2 is a a second subcarrier spacing S 2 , the second subcarrier spacing S 2 is greater than the first subcarrier spacing S 1 ;

The network device transmitting information of the second PRB mesh with D 2 according to the terminal.
The method of claim 25, further comprising:

The network device sends a synchronization signal to the terminal, and the PRB grid corresponding to the synchronization signal is a third PRB grid G 0 ;

The network device transmits to the second indication information terminal I 1, I 1 the second indication information for indicating a first one between the third grid G 0 PRB and the first grid PRB D A second frequency offset F 1 for determining the first PRB grid D 1 .
A method according to claim 25 or claim 26, wherein said second network device sends indication information to the terminal I 1, comprising:

The network device transmitting the second indication information I 1 through a physical broadcast channel PBCH.
The method according to any one of claims 25-27, wherein the first subcarrier spacing S 1 is 15 kHz or 60 kHz.
The method according to any of claims 25-28, wherein the network device transmits the first indication information to the terminal I 3, comprising:

The network device sends residual minimum system information RMSI to the terminal, and the RMSI carries the first indication information I 3 .
A communication device comprising means or means for performing the various steps of any one of claims 18 to 24.
A communication device comprising a processing element for connecting to a storage element, executing a program stored in the storage element to implement the method of any one of claims 18 to 24.
A communication device comprising means or means for performing the various steps of any one of claims 25 to 29.
A communication device comprising a processing element for connecting to a storage element, executing a program stored in the storage element to implement the method of any one of claims 25 to 29.
A computer storage medium having stored thereon a computer program for performing the method of any one of claims 18 to 24 when executed by a processor.
A computer storage medium having stored thereon a computer program for performing the method of any one of claims 25 to 29 when executed by a processor.
A communication method comprising:

Receiving, by the network device, a synchronization signal, where the physical resource block grid for the synchronization signal is a first physical resource block grid;

The terminal receives the first indication information from the network device, where the first indication information is used to indicate a first frequency offset between the first physical resource block grid and the second physical resource block grid;

The terminal receives the second indication information from the network device, where the second indication information is used to indicate a second frequency offset between the second physical resource block grid and the third physical resource block grid.
The method of claim 36, further comprising:

Determining, by the terminal, the first physical resource block grid according to the synchronization signal;

Determining the second physical resource block grid according to the first physical resource block grid and the first frequency offset.
The method of claim 36 or 37, further comprising:

The terminal determines the third physical resource block grid according to the second physical resource block grid and the second frequency offset.
The method of any of claims 36-38, further comprising:

The terminal performs information transmission with the network device according to the third physical resource block grid.
The method according to any one of claims 36 to 39, wherein the receiving, by the terminal, the first indication information from the network device comprises:

The terminal receives the first indication information through a physical broadcast channel PBCH.
The method according to any one of claims 36 to 40, wherein the receiving, by the terminal, the third indication information from the network device comprises:

The terminal receives remaining minimum system information RMSI, and the RMSI carries the third indication information.
The method according to any one of claims 36 to 41, wherein the subcarrier spacing of the second physical resource block grid is 15 kHz or 60 kHz.
A communication method comprising:

The network device sends a synchronization signal to the terminal, and the physical resource block grid for the synchronization signal is a first physical resource block grid;

The network device sends first indication information to the terminal, where the first indication information is used to indicate a first frequency offset between the first physical resource block grid and the second physical resource block grid;

The network device sends second indication information to the terminal, where the second indication information is used to indicate a second frequency offset between the second physical resource block grid and the third physical resource block grid.
The method of claim 43 further comprising:

The network device performs information transmission with the terminal according to the third physical resource block grid.
The method according to claim 43 or 44, wherein the sending, by the network device, the first indication information to the terminal comprises:

The network device sends the first indication information through a physical broadcast channel PBCH.
The method according to any one of claims 43 to 45, wherein the sending, by the network device, the third indication information to the terminal comprises:

The network device transmits remaining minimum system information RMSI, the RMSI carrying the third indication information.
The method according to any of claims 43-46, wherein the subcarrier spacing of the second physical resource block grid is 15 kHz or 60 kHz.
A communication device comprising means or means for performing the various steps of any one of claims 36 to 42.
A communication device comprising a processing element for connecting to a storage element, executing a program stored in the storage element to implement the method of any one of claims 36 to 42.
A communication device comprising means or means for performing the various steps of any one of claims 43 to 47.
A communication device comprising a processing element for connecting to a storage element, executing a program stored in the storage element to implement the method of any one of claims 43 to 47.
A computer storage medium having stored thereon a computer program for performing the method of any one of claims 36 to 42 when executed by a processor.
A computer storage medium having stored thereon a computer program for performing the method of any one of claims 43 to 47 when executed by a processor.