Communication method, device and system

Abstract

The communication method, device and system provided by the embodiments of the present application are used to determine the physical resource block (PRB) grid when the center frequency of the synchronization signal (SS) is inconsistent with the center frequency of the carrier to correctly receive or transmit data. The method includes: the terminal receives the SS from the network device; the terminal determines the first PRB grid according to the SS; the terminal receives the first indication information from the network device, and the first indication information is used to indicate the first frequency offset between the first PRB grid and the second PRB grid; the terminal determines the second PRB grid according to the first PRB grid and the first frequency offset.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies, and in particular, to communication methods, devices and systems. Background Art

[0002] In wireless communication technology, after a terminal is powered on, it accesses a wireless network through a process of cell search, system information reception, and random access, and then obtains the services of the wireless network. During the cell search process, the terminal detects a synchronization signal (SS), determines the cell where the terminal resides based on the SS, and achieves downlink synchronization with the cell.

[0003] The terminal detects SS with the channel raster as the granularity. The channel raster is 100kHz for all frequency bands, that is, the center frequency of the carrier is an integer multiple of 100kHz. SS includes the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). In the frequency domain, PSS and SSS are mapped to the 6 physical resource blocks (PRB) in the middle of the carrier (that is, the entire system bandwidth), that is, the 72 subcarriers in the middle of the carrier. Since downlink synchronization with the cell is not achieved at this time, in order to prevent interference, the 62 subcarriers actually mapped to the middle of the carrier, with 5 subcarriers on each side for protection. It can be seen that SS is located at the center of the carrier, that is, the center frequency of SS is consistent with (or the same as) the center frequency of the carrier. Therefore, after detecting SS, the terminal can know the center frequency of the carrier.

[0004] After the cell search, the terminal achieves downlink synchronization with the cell and can receive downlink information sent by the network device through the cell. For example, the network device broadcasts the carrier bandwidth (or system bandwidth) information on the physical broadcast channel (PBCH). The terminal receives the bandwidth information of the carrier and determines the carrier bandwidth based on 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 carrier's physical resource block (PRB) based on the center frequency of the carrier and the carrier bandwidth.

[0005] 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 inability to correctly receive or transmit data, thereby reducing communication quality. Summary of the invention

[0006] Embodiments of the present application provide a communication method, device, and system to determine a physical resource block (PRB) grid when a center frequency of a synchronization signal (SS) is inconsistent with a center frequency of a carrier, thereby correctly receiving or sending data.

[0007] In a first aspect, a communication method is provided, including: a terminal receives an SS from a network device; the terminal determines a first PRB grid based on the SS; the terminal receives first indication information from the network device, the first indication information being used to indicate a first frequency offset between the first 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.

[0008] In a second aspect, a communication method is provided, including: a network device sends an SS to a terminal according to a first PRB grid; the network device sends first indication information to the terminal, wherein the first indication information is used to indicate a first frequency offset between the first PRB grid and a second PRB grid; and the network device transmits information with the terminal according to the second PRB grid.

[0009] In a third aspect, a communication device is provided for a terminal, comprising: a unit or means for executing each step of the above first aspect.

[0010] In a fourth aspect, a communication device is provided for use in a network device, comprising: a unit or means for executing each step of the second aspect above.

[0011] In a fifth aspect, a communication device is provided, comprising at least one processing element and at least one storage element, wherein the at least one storage element is used to store programs and data, and when the device is used in a terminal, the at least one processing element is used to execute the method provided in the first aspect of the present application; when the device is used in a network device, the at least one processing element is used to execute the method provided in the second aspect of the present application.

[0012] In a sixth aspect, a communication device is provided, comprising at least one processing element (or chip) for executing the method of the first aspect or the second aspect above.

[0013] In a seventh aspect, a program is provided, which, when executed by a processor, is used to execute the method of the first aspect or the second aspect above.

[0014] In an eighth aspect, a program product is provided, such as a computer-readable storage medium, comprising the program of the seventh aspect.

[0015] In each of the above aspects, 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, it can determine the PRB grid corresponding to the data / control channel according to the PRB grid corresponding to the SS and the frequency offset. In this way, data / control information can be correctly transmitted and received on the data / control channel.

[0016] In one implementation, the subcarrier spacing of the second PRB grid is the same as the subcarrier spacing of the SS.

[0017] In one implementation, the network device sends the first indication information through a physical broadcast channel (PBCH), and the terminal receives the first indication information through the PBCH.

[0018] In one implementation, the first indication information is used to indicate a frequency offset value, wherein 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 indication information is used to indicate a frequency offset value and an offset direction of the first PRB grid relative to the second PRB grid.

[0019] In one implementation, there may be multiple subcarrier spacings on a carrier for data / control channel transmission. In order to determine the PRB grids corresponding to different subcarrier spacings, the above method may also include: the network device sends a third indication information to the terminal, and the third indication information is used to indicate a second frequency offset between the second PRB grid and the third PRB grid, wherein the subcarrier spacing of the third PRB grid is greater than the subcarrier spacing of the SS; the terminal receives the third indication information and determines the third PRB grid based on the second PRB grid and the second frequency offset.

[0020] In one implementation, the network device sends the third indication information via PBCH, or sends the third indication information via remaining minimum system information RMSI, or sends the third indication information via a radio resource control (RRC) message. Correspondingly, the terminal receives the third indication information via PBCH, RMSI or RRC message.

[0021] In this way, when the carrier supports multiple subcarrier spacings, when the terminal detects the SS, it can determine the PRB grid used for the SS based on the SS. When the subcarrier spacing of the SS and the subcarrier spacing of the data / control information are the same, the network device can determine the PRB grid used for the data / control information based on the first indication information; when the subcarrier spacing of the SS and the subcarrier spacing of the data / control information are different, the terminal can determine the PRB grid used for the data / control information based on the PRB grid corresponding to the subcarrier spacing that is the same as the subcarrier spacing of the SS according to the second indication information. In this way, correct transmission of data / control information on a carrier that supports multiple subcarrier spacings can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a communication system provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a terminal initially accessing a wireless network provided in an embodiment of the present application;

[0024] Figure 3 A frequency domain schematic diagram of an SS, a PBCH, and an SS block where the SS and the PBCH are located provided in an embodiment of the present application;

[0025] Figure 4 A frequency domain schematic diagram of a SS provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of an SS grid and a PRB grid provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of a communication method provided in an embodiment of the present application;

[0028] Figure 7 A schematic diagram of a first PRB grid and a second PRB grid in a case provided in an embodiment of the present application;

[0029] Figure 8 A schematic diagram of a first PRB grid and a second PRB grid in another case provided in an embodiment of the present application;

[0030] Fig. 9 A schematic diagram of another communication method provided in an embodiment of the present application;

[0031] Fig.10 A schematic diagram of another communication method provided in an embodiment of the present application;

[0032] Fig.11 A schematic diagram of a PRB grid corresponding to a plurality of subcarrier spacings provided in an embodiment of the present application;

[0033] Fig.12 A schematic diagram of another communication method provided in an embodiment of the present application;

[0034] Fig.13 A schematic diagram of another communication method provided in an embodiment of the present application;

[0035] Fig.14 A schematic diagram of a PRB grid provided in an embodiment of the present application;

[0036] Fig.15 A schematic diagram of a terminal initially accessing a network provided in an embodiment of the present application;

[0037] Fig.16 A schematic diagram of transmitting different SSs on a broadband carrier provided in an embodiment of the present application;

[0038] Fig.17 A schematic diagram of different terminals accessing the same carrier through different SSs provided in an embodiment of the present application;

[0039] Fig.18 A schematic diagram of another communication method provided in an embodiment of the present application;

[0040] Fig.19 A schematic diagram of different terminals accessing the same carrier through different SSs provided in an embodiment of the present application;

[0041] Fig. 20 A schematic diagram of another communication method provided in an embodiment of the present application;

[0042] Fig.21 A schematic diagram of another communication method provided in an embodiment of the present application;

[0043] Fig. 22 A schematic diagram of the structure of a network device provided in an embodiment of the present application;

[0044] Fig.23 A schematic diagram of the structure of a terminal provided in an embodiment of the present application.

[0045] Fig.24 A schematic diagram of another communication method provided in an embodiment of the present application.

[0046] Fig.25 A schematic diagram of a PRB grid provided in an embodiment of the present application.

[0047] Fig.26 A schematic diagram of another PRB grid provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] Hereinafter, some terms used in the embodiments of the present application are described to facilitate understanding by those skilled in the art.

[0049] 1) Terminal, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a device that provides voice / data connectivity to users, such as handheld devices with wireless connection functions, vehicle-mounted devices, etc. At present, some examples of terminals are: mobile phones, tablet computers, laptops, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.

[0050] 2) Network equipment is equipment that provides wireless services to terminals, such as radio access network (RAN) nodes (or devices). RAN nodes (or devices) are nodes (or devices) in the network that connect terminals to the wireless network. At present, some examples of RAN nodes are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), base band 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 this structure, the functional division of the RAN side is implemented in the CU and the DU, and multiple DUs are centrally controlled by one CU. In this case, the RAN node can be a CU node / DU node. The functions of the CU and DU can be divided according to the protocol layer of the wireless network, for example, the functions of the packet data convergence protocol (PDCP) layer are set in the CU, and the functions of the protocol layers below the PDCP, such as the radio link control (RLC) and the media access control (MAC) are set in the DU. This division of the protocol layer is only an example, and it can also be divided in other protocol layers, such as dividing in the RLC layer, setting the functions of the RLC layer and the protocol layers above the RLC layer in the CU, and the functions of the protocol layers below the RLC layer in the DU; or, dividing in a certain protocol layer, for example, setting some functions of the RLC layer and the functions of the protocol layers above the RLC layer in the CU, and setting the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer in the DU. In addition, it can also be divided in other ways, such as by latency, where functions that need to meet latency requirements are set in DU, and functions that are lower than the latency requirements are set in CU.

[0051] 3) "Multiple" means two or more, and other quantifiers are similar. " / " describes the relationship between related objects, indicating that there can be three relationships. For example, A / B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0052] Please refer to Figure 1 , which is a schematic diagram of a communication system provided in an embodiment of the present application. Figure 1 As shown, the terminal 120 accesses the wireless network through the network device 110 to obtain services of the external network (such as the Internet) through the wireless network, or communicates with other terminals through the wireless network. After the terminal 120 is turned on, it initially accesses the wireless network to obtain services of the wireless network and transmit and receive data. Figure 2 Describe, Figure 2 A schematic diagram of a terminal initially accessing a wireless network provided in an embodiment of the present application. After the terminal is powered on, it initially accesses the wireless network through processes such as cell search, receiving system information, and random access, and then can transmit (TX) and receive (RX) data.

[0053] During the cell search process, the terminal detects the synchronization signal (SS), determines the cell where the terminal resides based on the SS, and achieves downlink synchronization with the cell. In the Long Term Evolution (LTE) communication system, the terminal detects the SS with the channel raster as the granularity. The channel raster is 100kHz for all frequency bands, that is, the carrier center frequency is an integer multiple of 100kHz. SS includes the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). In the frequency domain, PSS and SSS are mapped to the 6 physical resource blocks (PRBs) in the middle of the carrier (that is, the entire system bandwidth), that is, the 72 subcarriers in the middle of the carrier. Since downlink synchronization with the cell is not achieved at this time, in order to prevent interference, it is actually mapped to the 62 subcarriers in the middle of the carrier, and 5 subcarriers on both sides play a protective role. It can be seen that SS is located at the center of the carrier, that is, the center frequency of SS is consistent with (or the same as) the center frequency of the carrier. Therefore, after detecting SS, the terminal can know the center frequency of the carrier. After the cell search, the terminal achieves downlink synchronization with the cell and can receive downlink information sent by the network device through the cell. For example, the network device broadcasts the bandwidth (or system bandwidth) information of the carrier on the physical broadcast channel (PBCH). The terminal receives the bandwidth information of the carrier and determines the carrier bandwidth based on 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 based on the center frequency and carrier bandwidth of the carrier.

[0054] In the fifth generation (5G) mobile communication system, also known as the New Radio (NR) communication system,

[0055] The initial access of the terminal to the wireless network also goes through the process of cell search, system information reception, and random access. In the NR communication system, the concept of synchronization signal block (SS block) is introduced. The SS block includes SS and physical broadcast channel (PBCH), where SS includes PSS and SSS. Please refer to Figure 3, which is a frequency domain schematic diagram of a SS, a PBCH, and a SS block where the SS and the PBCH are located provided in an embodiment of the present application. Figure 3 As shown in the figure, the SS block occupies 24 PRBs in the frequency domain, that is, 288 subcarriers. The center position of 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 SS and PBCH are aligned with, or consistent with, the center frequency of the SS block. SS occupies 12 PRBs, that is, 144 subcarriers; PBCH occupies 24 PRBs, that is, 288 subcarriers. In other words, SS is mapped to 12 PRBs and PBCH is mapped to 24 PRBs.

[0056] Please refer to Figure 4 , which is a frequency domain schematic diagram of a SS provided in an embodiment of the present application. Figure 4 As shown, SS is mapped on the 7th to 18th PRBs of the SS block. The 12 PRBs include 144 subcarriers numbered 0 to 143, wherein the SS sequence is mapped to subcarriers numbered 8 to 134; no other data is mapped on the 8 subcarriers before and after and the 9 subcarriers to play a protective role.

[0057] The network device sends SS blocks according to the SS raster, that is, the SS can be sent and information can be sent on the PBCH only at the position of the SS raster. The terminal blindly detects the SS according to the SS raster, that is, detects the SS at the position of the SS raster. When the SS is detected, the center frequency of the SS can be known, and then the information on the PBCH is received on the 24 PRBs centered on the center frequency. The SS raster is a raster formed by the possible positions of the SS in the frequency domain. When the SS is sent at a position of the SS raster, the center frequency of the SS is located at this position. When the subsequent network device 110 periodically sends the SS in the time domain, the frequency domain position of the SS remains unchanged. When the terminal detects the SS, it can determine the PRB grid corresponding to the SS based on 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 when transmitting 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 subcarrier spacing of the data / control information refers to the subcarrier spacing used for data / control information transmission / reception. If the terminal also transmits / receives data / control information according to the PRB grid corresponding to the SS, it may be inconsistent with the PRB grid used by the network device, thus leading to an erroneous interpretation of the PRB resources, and thus failing to correctly transmit and receive data.

[0058] Combine the following Figure 5, take the channel grid of 100kHz, the SS grid of 180kHz, and the SS subcarrier spacing of 15kHz as an example to describe the above problem. Figure 5 A schematic diagram of an SS grid and a PRB grid provided in an embodiment of the present application. Figure 5 The distance between the two adjacent vertical lines in the middle and lower parts represents the size of the SS grid, that is, 180kHz; the distance between the two adjacent vertical lines in the upper part represents the size of the channel grid, that is, 100kHz. The two middle PRB grids are the PRB grids corresponding to the data / control channel on the carrier and the PRB grids corresponding to the SS, respectively. 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 sizes are the same. Assume that the network device sends SS at position 510, and the terminal performs blind detection according to the SS grid and detects SS at position 510; let position 510 be 180*N kHz, where N is a non-negative integer. The center frequency of the carrier is located at the center of the carrier and is an integer multiple of the channel grid. When the number of PRBs of the carrier is an even number, the center frequency of the carrier is located between the two PRBs, that is, at the junction of the 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 middle PRB. Suppose the center frequency of the carrier is 100*M kHz, then the offset value between the center frequency of the carrier and position 510 is |180*N kHz-100*M kHz|, where "| |" indicates taking the absolute value. The subcarrier spacing size of SS is 15kHz, then the PRB size corresponding to SS is 15*12kHz, that is, 180kHz; the PRB size corresponding to the data / control channel is also 180kHz. At this time, the PRB grid corresponding to 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 SS, there will be resource interpretation errors, and data cannot be received or transmitted correctly, resulting in reduced communication quality.

[0059] Considering the above problems, the following embodiments provide several solutions to solve the problem of determining the PRB grid.

[0060] In one 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, it can determine the PRB grid corresponding to the data / control channel based on the PRB grid corresponding to the SS and the frequency offset. In this way, data / control information can be correctly transmitted and received on the data / control channel. In this solution, it is assumed that the PRB corresponding to the SS and the PRB corresponding to the data / control channel have the same subcarrier spacing.

[0061] There may be multiple subcarrier spacings on the carrier for data / control channel transmission. When the subcarrier spacing 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 set to PRB grid G1; when the subcarrier spacing for data / control channel transmission is different from the subcarrier spacing of the SS, the PRB grid used for the carrier at this time is set to PRB grid G2. PRB grid G1 can be obtained by the above scheme to transmit and receive data / control information on the data / control channel. When the subcarrier spacing for data / control channel transmission is greater than the subcarrier spacing of the SS, the network device can indicate the frequency offset between PRB grid G2 and PRB grid G1 to the terminal, so that the terminal can obtain PRB grid G1 using the above method, and then obtain PRB grid G2 to transmit and receive data / control information on the data / control channel. Alternatively, the network device can indicate the frequency offset between the boundary of PRB grid G2 and the center frequency of SS to the terminal, so that the terminal can perform data / control information transmission and reception on the data / control channel according to the center frequency of SS and the frequency offset PRB grid G2. When the subcarrier spacing used for data / control channel transmission is smaller than the subcarrier spacing of SS, since there is a nested relationship between the PRB grids corresponding to different subcarrier spacings, the PRB grid G2 can be directly obtained according to the PRB grid G1 and the subcarrier spacing used for data / control channel transmission to transmit and receive data / control information on the data / control channel.

[0062] 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 relative to B, or may refer to the absolute value of the frequency offset of B relative to A. In addition, the PRB grid in the embodiment of the present application may be understood as a PRB grid structure.

[0063] The following is a description with reference to the accompanying drawings.

[0064] Please refer to Figure 6 , which is a schematic diagram of a communication method provided in an embodiment of the present application. Figure 6 As shown, the method comprises the following steps:

[0065] S610: The network device sends an SS to the terminal.

[0066] S620: The terminal detects SS.

[0067] S630: when the SS is detected, determining the first PRB grid (PRB grid G0) according to the SS; that is, when the terminal receives the SS from the network device, determining the first PRB grid (PRB grid G0) according to the SS.

[0068] S640: The network device sends indication information I1 to the terminal, where the indication information I1 is used to indicate a frequency offset F1 between the first PRB grid (PRB grid G0) and the second PRB grid (PRB grid G1).

[0069] S650: The terminal determines a second PRB grid (PRB grid G1) according to the first PRB grid (PRB grid G0) and the frequency offset F1.

[0070] After determining the second PRB grid (PRB grid G1), if the network device uses the subcarrier spacing corresponding to the second PRB grid (PRB grid G1) on the carrier to transmit data / control information, or the network device allocates resources to the terminal according to the second PRB grid (PRB grid G1), then data / control information can be transmitted between the terminal and the network device according to the second PRB grid (PRB grid G1) (step S660).

[0071] The first PRB grid (PRB grid G0) can be called the PRB grid (PRB grid G0) for the SS (or SS block), and the second PRB grid can be called the PRB grid for the carrier (PRB grid G1). Among them, the first PRB grid is the PRB grid corresponding to the subcarrier spacing of the SS (or SS block) in the frequency domain. The second PRB grid can be the PRB grid corresponding to the subcarrier spacing of the physical channel information / physical signal on the carrier in the frequency domain. The physical channel here refers to a physical channel other than PBCH, for example, the physical channel includes at least one of the uplink / downlink control channel, the uplink / downlink shared channel (also known as the data channel) and the random access channel; the physical channel information refers to the information carried on the physical channel; the physical signal refers to the physical signal other than the SS, for example, the physical signal includes a reference signal. In the above description, the data / control channel is used as an example, and the random access channel or physical signal is similar.

[0072] In the above step S610, the grid device sends SS at a position of the SS grid, and the center frequency of the SS is located at this position. However, the terminal does not know at which position the network device sends, so in the above step S620, the terminal performs blind detection according to the SS grid. When the SS is detected at the first position of the SS grid, it can be determined that the position where the network device sends the SS is the first position, that is, the center frequency of the SS. In addition, the network device can broadcast information on the PBCH at the same time in S610. When the terminal detects the SS in S620, it 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; and then the frequency domain position of the PBCH can be determined, and the information broadcast by the network device can be received on the PBCH.

[0073] In the above step S630, the terminal determines a first PRB grid according to the first position of the SS grid (i.e., the center frequency of the SS) and the subcarrier spacing of the SS. A boundary of the first PRB grid is located at the first position, 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 in the PRB (e.g., 12). For example, please refer to Figure 5 , the terminal detects SS at position 510, then one boundary of the first PRB grid is located at position 510, the subcarrier spacing of SS is 15kHz, then the PRB size is 180kHz, so it can be obtained Figure 5 The lower PRB grid is the first PRB grid.

[0074] In the above step S640, the network device may send indication information I1 to the terminal via PBCH. For example, the network device broadcasts a master information block (MIB) on PBCH, and the MIB carries the above indication information I1. The terminal determines the frequency domain position of the PBCH, the center frequency of which is the center frequency of the SS, and the PBCH is mapped to 24 PRBs on both sides of the center frequency; and receives the indication information I1 broadcast by the network device on the PBCH. The indication information I1 may be the frequency offset F1 itself, or may be indication information of the frequency offset F1. For example, the indication information I1 may be 1-bit information. When the indication information I1 is "0", it indicates that the frequency offset F1 is 0, that is, there is no frequency offset, that is, the first PRB grid and the second PRB grid are aligned. At this point, the first PRB grid is determined, that is, the second PRB grid is determined. For another example, when the indication information I1 is "1", it indicates that the frequency offset F1 is half a PRB. At this time, in step S650, the grid of the first PRB may be offset by half a PRB to obtain the grid of the second PRB.

[0075] In the above step S650, the terminal moves the first PRB grid in the frequency domain according to the frequency offset F1 indicated by the indication information I1 to obtain the second PRB grid.

[0076] When the second PRB grid is obtained, data / control information transmission of the subcarrier interval corresponding to the second PRB grid can be carried out between the terminal and the network device, including uplink transmission / downlink transmission, and the boundary of the PRB is aligned with the second PRB grid. That is, the network device can determine the position of the PRB of the subcarrier interval corresponding to the second PRB grid in the frequency domain according to the second PRB grid, thereby allocating resources to the terminal, and the terminal receives data / control information on the allocated resources, or transmits data / control information 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 resources and the correct transmission and reception of data / control information.

[0077] The PRB boundaries of the first PRB grid are aligned with the center frequency of the SS. When the number of PRBs in the carrier is an even number, the PRB boundaries of the second PRB grid are 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 a 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 an integer multiple of half a PRB, the first PRB grid and the second PRB grid are aligned.

[0078] The following describes several situations:

[0079] Case 1: Assume that 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.

[0080] 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 PRB size corresponding to the subcarrier spacing of 30kHz is 360kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |360*n-180*m|kHz, that is, 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. Among them, m, n, k are all non-negative integers, and "| |" represents the absolute value.

[0081] Please refer to Figure 7 (1): When the number of PRBs with a subcarrier spacing of 30kHz in the carrier is an even number, the center frequency of the carrier is at the boundary of the second PRB grid. At this time, m is an even number, then |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 multiple of the PRB size (360kHz). At this time, the first PRB grid and the second PRB grid are aligned.

[0082] Please refer to Figure 7 (2): When the number of PRBs with a subcarrier spacing of 30kHz 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 middle PRB. At this time, m is an odd number, then |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*kkHz, which is an integer multiple of the PRB size (360kHz) and 1 / 2PRB, that is, half of the PRB size. At this time, the first PRB grid and the second PRB grid are aligned.

[0083] Therefore, regardless of whether the number of PRBs with a subcarrier spacing of 30 kHz in the carrier is an odd number or an even number, the first PRB grid and the second PRB grid can be aligned, so the indication information I1 at this time can indicate that the frequency offset F1 is 0. For example, when the indication information I1 is "0", it indicates that the frequency offset F1 is 0.

[0084] Case 2: Assume that 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.

[0085] The center frequency of the SS is 360*n kHz, the center frequency of the carrier is 180*m kHz, and the PRB size corresponding to the subcarrier spacing of 15kHz is 180kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |360*n-180*m|kHz, that is, 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. Among them, m, n, k are all non-negative integers, and "| |" represents the absolute value.

[0086] Please refer to Figure 8 (1): When the number of PRBs with a subcarrier spacing of 15kHz in the carrier is an even number, the center frequency of the carrier is at the boundary of the second PRB grid. At this time, m is an even number, then |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 multiple of the PRB size (180kHz). At this time, the first PRB grid and the second PRB grid are aligned.

[0087] Please refer to Figure 8 (2): When the number of PRBs with a subcarrier spacing of 15kHz 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 middle PRB. At this time, m is an odd number, then |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 multiple of the PRB size (180kHz). At this time, the first PRB grid and the second PRB grid are not aligned, offset by half a PRB.

[0088] At this time, 1-bit indication information I1 can be used to indicate the frequency offset F1 between the first PRB grid and the second PRB grid. When the indication information is "0", it indicates that the frequency offset F1 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", it indicates that the frequency offset F1 between the first PRB grid and the second PRB grid is half a PRB, that is, there is a positional relationship between the first PRB grid and the second PRB grid that is offset by half a PRB. Of course, the contents indicated by "0" and "1" can also be reversed, and this application does not limit this.

[0089] Case 3: Assume 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.

[0090] 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 15kHz is 180kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |180*n-100*m|kHz. Among them, m and n are both non-negative integers, and "| |" represents the absolute value. At this time, the frequency offset between the center frequency of the carrier and the center frequency of the SS varies with the values ​​of m and n, and there are multiple possibilities for the frequency offset F1 between the first PRB grid and the second PRB grid.

[0091] In one implementation, the indication information can be used to directly indicate the frequency offset F1 between the first PRB grid and the second PRB grid. In another implementation, a predefined offset set includes all possible values ​​of the frequency offset between the first PRB grid and the second PRB grid. In this example, the offset set can be {0, 10, 20, 30, 40, 60, 70, 80, 90, 100, 110, 120, 130, 140, 160, 170} kHz, with a total of 16 values. At this time, a 4-bit indication information I1 can be used to indicate a value in the offset set. The terminal and the network device have the same understanding of the content indicated by the indication information I1. In addition, a 1-bit indication information or indication bit is used to indicate the offset direction.

[0092] In addition, the frequency offset between the first PRB grid and the second PRB grid is different due to different offset directions. Therefore, in one implementation, the offset in the high frequency direction or the offset in the low frequency direction can be predefined, that is, the offset direction is predefined, and the network device and the terminal have the same understanding of the offset direction. In another implementation, another indication information I2 is added or 1 bit is added to the indication information to indicate the offset direction. For example, "0" is used to indicate an offset in the low frequency direction, and "1" is used to indicate an offset in the high frequency direction. Of course, the contents indicated by "0" and "1" can also be reversed, and this application does not limit this.

[0093] 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 / 2PRB size, the third case can be used to indicate the frequency offset F1 between the first PRB grid and the second PRB grid.

[0094] For example, when 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 toward 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 toward the high frequency direction, the offset set can be {0, 20, 40, 60, 70, 80, 90, 100, 120, 140, 160, 170} kHz.

[0095] Fourth case: Assume 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.

[0096] 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 PRB size corresponding to the subcarrier spacing of 15kHz is 180kHz. The frequency offset between the center frequency of the carrier and the center frequency of the SS is |100*n-100*m|kHz. Among them, m and n are both non-negative integers, and "| |" represents the absolute value. At this time, it can be considered that the SS grid and the channel grid are aligned.

[0097] When the number of PRBs with a subcarrier spacing of 15kHz in the carrier is an even number, the first PRB grid and the second PRB grid are aligned. When the number of PRBs with a subcarrier spacing of 15kHz in the carrier is an odd number, the first PRB grid and the second PRB grid are offset by 10kHz or 90kHz. At this time, the offset direction can be predefined as offsetting in the high frequency direction or offsetting in the low frequency direction. The frequency offset F1 between the first PRB grid and the second PRB grid is indicated by 1-bit indication information I1. One of the values ​​indicates that the frequency offset is 0, that is, no offset; the other value is offset by 10kHz or 90kHz. Alternatively, the frequency offset value and offset direction can be indicated by 2 bits of indication information I1. For example, "00" indicates that the frequency offset is 0, that is, no offset; "01" indicates that the first PRB grid is offset by 10kHz in the low frequency direction (or 90kHz in the high frequency direction) to obtain the second PRB grid. "10" indicates that the first PRB grid is offset by 10kHz in the high frequency direction (or 90kHz in the low frequency direction) to obtain the second PRB grid.

[0098] Similarly, when the size of the SS grid is 100kHz, the size of the channel grid is 100kHz, and the subcarrier spacing of the SS is 30kHz, when the number of PRBs with a subcarrier spacing of 30kHz in the carrier is an even number, the first PRB grid and the second PRB grid are aligned. When the number of PRBs with a subcarrier spacing of 30kHz in the carrier is an odd number, the first PRB grid and the second PRB grid are offset by 20kHz or 80kHz. The indication method is the same as described above and will not be repeated here.

[0099] The fifth situation: used in high-frequency communication systems, that is, communication systems with carrier frequencies higher than 6 GHz.

[0100] For example, the size of the SS grid is 2880kHz, the size of the channel grid is 720kHz, and the subcarrier spacing of the SS is 120kHz; then no matter whether the number of 120kHz PRBs in the carrier is odd or even, the offset value between the channel raster and the SS raster can be guaranteed to be 720*k. Then it can be guaranteed that the first PRB grid and the second PRB grid are aligned, and the indication information I1 may not be broadcast in the PBCH in the high-frequency communication system.

[0101] For another example, the size of the SS grid is 11520kHz, the size of the channel grid is 720kHz, and the subcarrier spacing of the SS is 240kHz. Then, regardless of whether the number of 240kHz 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 a high-frequency communication system, if the SS grid is an integer multiple of the channel grid, it can be guaranteed that the first PRB grid and the second PRB grid are aligned, and the indication information I1 may not be broadcast in the PBCH in the high-frequency communication system.

[0102] In the above various situations, the size of the SS grid, the size of the channel grid and the subcarrier spacing of the SS can 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 1.8GHz carrier frequency band supports the second situation, and the relationship between the first PRB grid and the second PRB grid is indicated by the indication information I1 in this frequency band. For another example, the 3.5GHz carrier frequency band supports the first situation, and the relationship between the two PRBs may not be indicated in this frequency band or the frequency offset may be indicated as 0, then the terminal assumes that the first PRB and the second PRB are aligned. For details, please refer to the following Table 1.

[0103] Table 1

[0104]

[0105] For the first and fifth cases, in addition to using the indication information to indicate that the frequency offset is 0, the indication information I1 may not be sent. For example, in a high frequency communication system, the indication information I1 may not be sent by default. The terminal assumes (or defaults) that the PRB grid used for the SS (or SS block) is the same (or consistent) as the PRB grid used for the carrier.

[0106] In the above table, for the subcarrier spacing of SS in different frequency ranges, the selection of SS grid and channel grid can select only one combination or multiple combinations, which is not limited in this application.

[0107] In another scheme of the present application, the terminal assumes (or defaults) that the PRB grid used for the SS (or SS block) is the same (or consistent) as the PRB grid (structure) used for the carrier. At this time, the terminal defaults the PRB grid used for the SS (or SS block) to the PRB grid used for the carrier to correctly transmit and receive data / control information on the data / control channel. At this time, the network device can 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, so that X=Z*M1, and Y*12=Z*N1, M1 and N1 are integers greater than or equal to 2. Since the above formula is satisfied, the PRB grid used for the SS (or SS block) is the same (or consistent) as the PRB grid (structure) used for the carrier, which is consistent with the assumption of the terminal, so the terminal can correctly transmit and receive data / control information on the data / control channel.

[0108] Please refer to Fig. 9 , which is a schematic diagram of another communication method provided by an embodiment of the present application. In this method, the terminal defaults that the PRB grid used for the SS is the same as or aligned with the PRB grid used for the carrier. Fig. 9 As shown, the method comprises the following steps:

[0109] S910: The terminal receives SS from the network device;

[0110] S920: The terminal determines a first PRB grid according to the SS, wherein the first PRB grid is aligned with (or consistent with) a PRB grid used for data / control information transmission on the carrier;

[0111] S930: The terminal uses the first PRB grid as the PRB grid of the carrier, and receives / transmits data / control information on the carrier.

[0112] The process in which the terminal receives the SS and determines the first PRB grid according to the SS is the same as steps S620 and S630 in the above embodiment, which will not be described in detail here.

[0113] In the above step S930, the terminal assumes that the PRB grid used for the SS is the same as or aligned with the PRB grid used for the carrier, and uses the PRB grid used for the SS as the PRB grid of the carrier. Since the PRB grid used for data / control information transmission on the carrier is aligned with the PRB grid used for the SS, the terminal can correctly interpret the frequency resources and receive and transmit data / control information.

[0114] Please refer to Fig.10 , which is a schematic diagram of another communication method provided by an embodiment of the present application. In this method, the terminal defaults that the PRB grid used for the SS is the same as or aligned with the PRB grid used for the carrier. Fig.10 As shown, the method comprises the following steps:

[0115] 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.

[0116] S102: The network device sends the SS at a first position of the SS grid using the determined subcarrier spacing, wherein the center frequency of the SS is located at the first position.

[0117] S103: The network device transmits or receives data / control information on the carrier using the determined subcarrier spacing, wherein the PRB grid used for the carrier is the same as the PRB grid used for the SS.

[0118] Among them, the size of the SS grid is X, the size of the subcarrier spacing is Y, and the size of the channel grid is Z, X=Z*M1, and Y*12=Z*N1, M1 and N1 are integers greater than or equal to 2.

[0119] The NR communication system supports multiple subcarrier spacings, such as {3.75, 7.5, 15, 30, 60, 120, 240, 480}kHz. A carrier can support multiple subcarrier spacings, and the 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 As shown, Fig.11 A schematic diagram of a PRB grid corresponding to a plurality of subcarrier spacings provided in an embodiment of the present application. f0, 2f0, 4f0 and 8f0 on the left represent subcarrier spacings, and the grids corresponding to these subcarrier spacings represent the PRB grids under the corresponding subcarrier spacings. It can be seen that the PRB grids corresponding to different subcarrier spacings have a nested relationship in the frequency domain. After the terminal determines the PRB grid corresponding to a subcarrier spacing, it cannot determine the PRB grids corresponding to other subcarrier spacings larger than the subcarrier spacing. For example, Fig.11 As shown, the boundary of the PRB grid corresponding to the subcarrier spacing f0 may fall on the boundary of the PRB grid corresponding to 2f0, or may fall on the center of the PRB in the PRB grid corresponding to the subcarrier spacing 2f0. Therefore, the terminal cannot determine the PRB grid corresponding to 2f0. If the terminal determines the PRB grid corresponding to the subcarrier spacing 2f0, the boundary of the PRB grid corresponding to the subcarrier spacing f0 is only on the boundary of the PRB grid corresponding to the subcarrier spacing 2f0, so the PRB grid corresponding to the subcarrier spacing f0 can be directly determined based on the subcarrier spacing f0.

[0120] Taking this problem into consideration, an embodiment of the present application provides another communication method, in which a network device sends an indication message I3 to a terminal, and the indication message I3 is used to indicate the frequency offset between PRB grids corresponding to different subcarrier spacings, so that the terminal can determine an unknown PRB grid based on the known PRB grid and the frequency offset. The known PRB grid can be the PRB grid G1 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, then the method for obtaining the known PRB grid is the same as the method for obtaining the PRB network G1 in the above embodiment, and will not be repeated here.

[0121] Please refer to Fig.12 , which is a schematic diagram of another communication method provided in an embodiment of the present application, such as Fig.12 As shown, the method comprises the following steps:

[0122] S121: The terminal determines a PRB grid D1, where the subcarrier spacing corresponding to the PRB grid D1 is S1.

[0123] S122: The network device sends indication information I3 to the terminal; the indication information is used to indicate the frequency offset F2 between the PRB grid D1 and the PRB grid D2, wherein the subcarrier spacing corresponding to the PRB grid D2 is S2, wherein the subcarrier spacing S2 is greater than the subcarrier spacing S1. The terminal receives the indication information I3 from the network device and executes the following step S123.

[0124] S123: The terminal determines the PRB grid D2 according to the PRB grid D1 and the frequency offset F2.

[0125] Afterwards, data / control information is transmitted between the terminal and the network device (S124), wherein the network device allocates resources for data / control information transmission to the terminal according to the PRB grid D2. After the terminal determines the PRB grid D2, its understanding of resources is consistent with that of the network device, thereby improving the accuracy of data / control information transmission.

[0126] Among them, the PRB grid D1 may be the PRB grid G1 in the above embodiment. The terminal may determine the PRB grid D1 by the method in the above embodiment, which will not be repeated here. Or the terminal defaults that the PRB grid D1 (PRB grid G1) is the same (or consistent) as the PRB grid (PRB grid G0) used for the SS (or SS block), then after detecting the SS, the terminal directly determines the PRB grid D1 according to the detected SS.

[0127] The subcarrier spacing S1 corresponding to the PRB grid D1 may be the subcarrier spacing of the SS. The subcarrier spacing S2 corresponding to the PRB grid D2 is greater than the subcarrier spacing of the SS.

[0128] The network device may send the indication information I3 via PBCH; the terminal may receive the indication information I3 via PBCH. Alternatively, the network device may send the indication information I3 via remaining minimum system information (RMSI); the terminal may receive the RMSI, which carries the indication information I3. Alternatively, the network device may send the indication information I3 via high-level signaling, such as a radio resource control (RRC) message; the terminal may receive the high-level signaling, which carries the indication information I3.

[0129] The method in this embodiment can be combined with the method in the above embodiment. When the carrier supports multiple subcarrier spacings, the multiple subcarrier spacings include subcarrier spacing S1 and subcarrier spacing S2, wherein subcarrier spacing S1 is the same as the subcarrier spacing of SS, and subcarrier spacing S2 is different from the subcarrier spacing of SS. When the terminal detects the SS, it can determine the PRB grid used for the SS according to the SS. When the terminal defaults to the same PRB grid used for the SS as the PRB grid used for the carrier, the PRB grid of the SS can be used as the PRB grid D1. When the terminal determines the PRB grid used for the carrier according to the indication information I1 sent by the network device, the PRB grid D1 is determined according to the indication information I1 in the above embodiment. Then, the PRB grid D2 is determined according to the PRB grid D1 and the indication information I3. In this way, the correct transmission of data / control information on the carrier supporting subcarrier spacings S1 and S2 can be achieved. More subcarrier spacings are similar and will not be repeated here.

[0130] The terminal defaults that the PRB grid D1 (PRB grid G1) is the same as the PRB grid G0 used for the SS (or SS block). After detecting the SS, the terminal determines the above PRB grid D2 according to the detected SS. Please refer to Fig.13 , which is a schematic diagram of another communication method provided in an embodiment of the present application, such as Fig.13 As shown, the method comprises the following steps:

[0131] S131: The network device sends an SS to the terminal.

[0132] S132: The terminal detects SS.

[0133] S133: When the SS is detected, determine the center frequency of the SS.

[0134] S134: The network device sends indication information I4 to the terminal, where the indication information I4 is used to indicate a frequency offset F3 between the center frequency of the SS and the boundary of the PRB grid D2.

[0135] S135: The terminal determines the PRB grid D2 according to the center frequency of the SS and the frequency offset F3.

[0136] Afterwards, data / control information is transmitted between the terminal and the network device (S136), wherein the network device allocates resources for data / control information transmission to the terminal according to the PRB grid D2. After the terminal determines the PRB grid D2, its understanding of resources is consistent with that of the network device, thereby improving the accuracy of data / control information transmission.

[0137] The subcarrier spacing S2 corresponding to the above PRB grid D2 is greater than the subcarrier spacing of SS.

[0138] The network device may send the indication information I4 via PBCH; the terminal may receive the indication information I4 via PBCH. Alternatively, the network device may send the indication information I4 via RMSI; the terminal may receive the RMSI, which carries the indication information I4. Alternatively, the network device may send the indication information I4 via high-level signaling, such as an RRC message; the terminal may receive the high-level signaling, which carries the indication information I4.

[0139] Please refer to Fig.14 , which is a schematic diagram of a PRB grid provided in an embodiment of the present application. Assume that the subcarrier spacing corresponding to the PRB grid D1 or the subcarrier spacing of the SS is the reference subcarrier spacing f0, and the subcarrier spacing corresponding to the PRB grid D2 is f1. Fig.14 (1) shows that f1 / f0=2: Fig.12 In the embodiment shown, the boundary of the PRB grid D1 can be located at the boundary of the PRB grid D2 (such as position 0 in the figure), or at the center of the PRB of the PRB grid D2 (such as position 1 in the figure). In this case, a 1-bit indication information I3 can be used to indicate the position, for example, "0" indicates position 0, and "1" indicates position 1. Of course, the meaning of the value of the indication information I3 can also be reversed, and there is no limitation on this. Fig.13 In the embodiment shown, the center frequency of the SS (or SS block) can be located at the boundary of the PRB grid D2 (such as position 0 in the figure), or at the center of the PRB of the PRB grid D2 (such as position 1 in the figure). In this case, a 1-bit indication information I4 can be used to indicate the position, for example, "0" represents position 0, and "1" represents position 1. Of course, the meaning of the value of the indication information I4 can also be reversed, and there is no restriction on this. The above positions can be represented by frequency offsets, that is, position 0 represents that the frequency offset F2 or F3 is 0, and position 1 represents that the frequency offset F2 or F3 is half a PRB. The subcarrier spacing corresponding to the PRB is the same as the subcarrier spacing corresponding to the PRB grid D2.

[0140] like Fig.14(2) shows that f1 / f0=4: Fig.12 In the embodiment shown, the boundary of the PRB grid D1 can be located at the boundary of the PRB grid D2 (such as position 0 in the figure), or at 1 / 4 of the PRB of the PRB grid D2 (such as position 1 in the figure), or at the center of the PRB of the PRB grid D2 (such as position 2 in the figure), or at 3 / 4 of the PRB of the PRB grid D2 (such as position 3 in the figure). In this case, 2 bits of indication information I3 can be used to indicate the position, for example, "00" indicates position 0, "01" indicates position 1, "10" indicates position 2, and "11" indicates position 3. For Fig.13 In the embodiment shown, the center frequency of the SS (or SS block) can be located at the boundary of the PRB grid D2 (such as position 0 in the figure), or at 1 / 4 of the PRB of the PRB grid D2 (such as position 1 in the figure), or at the center of the PRB of the PRB grid D2 (such as position 2 in the figure), or at 3 / 4 of the PRB of the PRB grid D2 (such as position 3 in the figure). At this time, 2 bits of indication information I4 can be used to indicate the position, for example, "00" indicates position 0, "01" indicates position 1, "10" indicates position 2, and "11" indicates position 3. The above positions can be represented by frequency offsets, that is, position 0 indicates that the frequency offset F2 or F3 is 0, position 1 indicates that the frequency offset F2 or F3 is 1 / 4 PRB, position 2 indicates that the frequency offset F2 or F3 is 1 / 2 PRB, and position 3 indicates that the frequency offset F2 or F3 is 3 / 4 PRB. The subcarrier spacing corresponding to the PRB is the same as the subcarrier spacing corresponding to the PRB grid D2. The possible position numbering of a PRB in the PRB grid D2 may be predefined to be numbered from the low frequency domain position to the high frequency domain position or predefined to be numbered from the high frequency domain position to the low frequency domain position, or one bit may be used to indicate the direction of the numbering, that is, the direction of the offset.

[0141] The above embodiments have described that the PRB grid D2 can be used for data / control information transmission. For example, the PRB grid D2 can be used for RMSI transmission. At this time, the PRB grid D2 is the PRB grid of RMSI, and any of the methods for determining the PRB grid D2 provided in the above embodiments can be used to determine the PRB grid of RMSI. The PRB grid of RMSI refers to the PRB grid corresponding to the subcarrier spacing used to transmit RMSI. At this time, the subcarrier spacing of the RMSI is the subcarrier spacing S2 corresponding to the above PRB grid D2. The following description is made with reference to the accompanying drawings, taking the PRB grid D2 as the PRB grid of RMSI as an example.

[0142] Please refer to Fig.24 , which is a schematic diagram of another communication method provided in an embodiment of the present application. Fig.24 As shown, the method comprises the following steps:

[0143] S241: The network device sends an SS block.

[0144] The SS block includes SS and PBCH, where PBCH carries the information of the subcarrier spacing S2 of the RMSI.

[0145] S242: The terminal detects the SS and receives information on the PBCH.

[0146] After the terminal detects the SS, it can determine the center frequency of the SS, and then receive information on the PBCH on the 24 PRBs centered on the center frequency. In this way, the terminal can obtain the subcarrier spacing S2 of the RMSI. Since the subcarrier spacing S2 of the RMSI may be different from the subcarrier spacing of the SS, it has been described in the above embodiment that when the subcarrier spacing S2 of the RMSI is greater than the subcarrier spacing of the SS, the network device indicates to the terminal the frequency offset F2 between the PRB grid D1 and the PRB grid D2, so that the terminal determines the PRB grid D2 of the RMSI based on the PRB grid D1. For example, the network device sends an indication message I0 to the terminal, which is used to determine the PRB grid of the RMSI. At this time, the above method also includes:

[0147] S243: The network device sends indication information I0 to the terminal, where the indication information is used to determine the PRB grid of the RMSI.

[0148] The network device may send the indication information I0 via the PBCH.

[0149] S244: The terminal receives the indication information I0, and determines the PRB grid of the RMSI according to the indication information I0.

[0150] The terminal determines the PRB grid D1 specifically according to any method of the above embodiments, and then determines the PRB grid of the RMSI according to the PRB grid D1 and the indication information I0.

[0151] S245: The terminal receives the RMSI according to the determined PRB grid of the RMSI.

[0152] Several implementation schemes of the indication information I0 are introduced below. These implementation schemes of the indication information I0 are applicable to any of the above schemes for determining the PRB grid D2. For example, the PRB grid D2 is Fig.24 The PRB grid of the RMSI in .

[0153] Solution 1: Indicating the relative position between PRB grid D1 and PRB grid D2

[0154] The indication information I0 may include 2-bit information bits, and the interpretation of the 2-bit information bits is different for the subcarrier spacing S1 corresponding to the PRB grid D1 and the subcarrier spacing S2 corresponding to the PRB grid D2.

[0155] Please refer to Fig.25 , which is a schematic diagram of a PRB grid provided in an embodiment of the present application. Assume that the subcarrier spacing corresponding to the PRB grid D1 is the reference subcarrier spacing f0, and the subcarrier spacing is equal to the subcarrier spacing of the SS; the subcarrier spacing corresponding to the PRB grid D2 is f1. Fig.25 As shown, Fig.25 (1) For example, the subcarrier spacing f0 is 15kHz and the subcarrier spacing f1 is 30kHz. Fig.25 (2) For example, the subcarrier spacing f0 is 30 kHz and the subcarrier spacing f1 is 60 kHz, where f1 / f0 = 2. At this time, one boundary of the PRB grid D1 (for example, boundary B1 in the figure) can be located at the boundary of the PRB grid D2 (indicated by position 0 in the figure), or at the center of the PRB of the PRB grid D2 (indicated by position 1 in the figure).

[0156] At this time, the 2-bit indication information I0 can be used to indicate the grid position, for example, "00" indicates position 0, "01" indicates position 1, and "10" and "11" are reserved information bits. Of course, the value meaning of the indication information I0 can also have other interpretations, for example, "10" indicates position 0, "11" indicates position 1, and "00" and "01" are reserved information bits; there is no restriction on this. The above grid positions can be represented by frequency domain offsets, that is, "00" indicates that the frequency domain offset is 0, "01" indicates that the frequency domain offset is half a PRB or 6 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the same as the subcarrier spacing corresponding to the PRB grid D2. Or "00" indicates 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 subcarrier is the same as the subcarrier spacing corresponding to the PRB grid D1.

[0157] Please refer to Fig.26 , which is a schematic diagram of another PRB grid provided in an embodiment of the present application. Assume that the subcarrier spacing corresponding to the PRB grid D1 is the reference subcarrier spacing f0, and the subcarrier spacing is equal to the subcarrier spacing of the SS; the subcarrier spacing corresponding to the PRB grid D2 is f1. Fig.26As shown, taking the subcarrier spacing f0 as 15kHz and the subcarrier spacing f1 as 60kHz as an example, where f1 / f0=4. At this time, a boundary of the PRB grid D1 (taking the boundary B2 in the figure as an example) can be located at the boundary of the PRB grid D2 (represented by position 0 in the figure), or at 1 / 4 of the PRB of the PRB grid D2 (represented by position 1 in the figure), or at the center of the PRB of the PRB grid D2 (represented by position 2 in the figure), or at 3 / 4 of the PRB of the PRB grid D2 (represented by position 3 in the figure). The frequency domain offset direction can predefine the boundary B1 to offset from the low frequency domain position to the high frequency domain position or predefine the boundary B1 to offset from the high frequency domain position to the low frequency domain position, or use 1 bit to indicate the direction of the offset.

[0158] At this time, the 2-bit indication information I0 can be used to indicate the grid position, for example, "00" indicates position 0, "01" indicates position 1, "10" indicates position 2, and "11" indicates position 3. Of course, the value meaning of the indication information I0 can also have other interpretations, and there is no restriction on this. The above grid positions can be represented by frequency domain offsets, 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, "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 PRB or 9 subcarriers. The subcarrier spacing corresponding to the PRB or subcarrier is the same as the subcarrier spacing corresponding to the PRB grid D2. 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 that the frequency domain offset is 3 PRBs or 36 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the same as the subcarrier spacing corresponding to the PRB grid D1. The frequency domain offset direction can be predefined boundary B2 from the low frequency domain position to the high frequency domain position or 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.

[0159] In addition, one boundary of the above PRB grid D1 has an offset relative to the center frequency of the SS (as shown in the figure as offset), and the offset may be "0". In this case, the PRB grid of the SS may be used as the PRB grid D1.

[0160] It can be seen that in this solution, the indication information I0 can be used to indicate the relative position between the PRB grid D1 and the PRB grid D2. The relative position can be a frequency domain offset or a position of a preset boundary of the PRB grid D1 on the PRB grid D2.

[0161] Solution 2: Indicate the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band, thereby implicitly obtaining the PRB grid D2.

[0162] The indication information I0 may include 2 bits of information, which are used to indicate the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band. For example, in a carrier below 6 GHz, no matter how large the RMSI subcarrier is, the indication information is used to indicate the PRB grid corresponding to 60 kHz.

[0163] If the subcarrier spacing of the SS is 15kHz, the subcarrier spacing corresponding to the PRB grid D1 is 15kHz. Then the indication information I0 indicates the relative position between the PRB grid D2' and the PRB grid D1 corresponding to the maximum subcarrier spacing supported by the carrier frequency band. The relative position can be a frequency domain offset or the position of the boundary of the PRB grid D1 on the PRB grid D2. For example, the indication information I0 is "00", which means that the frequency domain offset is 0, "01" means that the frequency domain offset is 1 / 4 PRB or 3 subcarriers, "10" means that the frequency domain offset is 1 / 2 PRB or 6 subcarriers, and "11" means that the frequency domain offset is 3 / 4 PRB or 9 subcarriers. The subcarrier spacing corresponding to the PRB or subcarrier is the maximum subcarrier spacing (60kHz) supported by the current carrier frequency band. Or the indication information I0 is "00" indicating that the frequency domain offset is 0, "01" indicating that the frequency domain offset is 1 PRB or 12 subcarriers, "10" indicating that the frequency domain offset is 2 PRBs or 24 subcarriers, "11" indicating 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 SS. The frequency domain offset direction can be predefined that the boundary B2 in the PRB grid D1 is offset from the low frequency domain position to the high frequency domain position or the boundary B2 in the predefined PRB grid D1 is offset from the high frequency domain position to the low frequency domain position, or 1 bit is used to indicate the direction of the offset.

[0164] If the subcarrier spacing of SS is 30kHz, the subcarrier spacing corresponding to PRB grid D1 is 30kHz. Then the indication information I0 indicates the relative position between PRB grid D2" and PRB grid D1 corresponding to the maximum subcarrier spacing supported by the carrier frequency band. The relative position can be the frequency domain offset or the position of the boundary of PRB grid D1 on PRB grid D2". For example, the indication information I0 is "00", which means that the frequency domain offset is 0, and "01" means that the frequency domain offset is half a PRB or 6 subcarriers, and the subcarrier spacing corresponding to this PRB or subcarrier is the maximum subcarrier spacing (60kHz) supported by the current carrier frequency band. Or the indication information I0 is "00", which means that the frequency domain offset is 0, and "01" means that the offset is 1 PRB or 12 subcarriers, and the subcarrier spacing corresponding to this PRB or subcarrier is the same as the subcarrier spacing of SS. The frequency domain offset direction may predefine the boundary B1 in the PRB grid D1 to be offset from the low frequency domain position to the high frequency domain position or predefine the boundary B1 in the PRB grid D1 to be offset from the high frequency domain position to the low frequency domain position, or use 1 bit to indicate the offset direction.

[0165] The value of the above indication information I0 may also have other meanings, which are not limited.

[0166] When the PRB grid corresponding to the maximum subcarrier spacing supported by the current carrier frequency band is determined, Fig.11 The nesting relationship between the different subcarrier spacings shown determines the PRB grid D2.

[0167] It can be seen that in this solution, the indication information I0 can be used to indicate the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band. For example, the relative position between the PRB grid D1 and the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band can be a frequency domain offset or a preset boundary of the PRB grid D1 on the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band.

[0168] Solution 3: Indicating the relative position between PRB grid D1 and PRB grid D2

[0169] During the initial access process, RMSI is used for the terminal to access the carrier. At this time, the subcarrier spacing of RMSI is supported by all terminals. In the frequency band below 6GHz, the subcarrier spacing of 60kHz may not be suitable for all terminals. The candidate subcarrier spacing of RMSI may only be 15kHz or 30kHz. At this time, a 1-bit second indication information I0 can be sent on PBCH to indicate the PRB grid corresponding to the subcarrier spacing of RMSI.

[0170] For example, the indication information I0 is "0" indicating that the frequency domain offset is 0, and "1" indicates an offset of half a PRB or 6 subcarriers, and the subcarrier spacing corresponding to the PRB or subcarrier is the subcarrier spacing of the RMSI. Or the indication information I0 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 can be a predefined PRB grid D1 in which the boundary B1 or B2 is offset from a low frequency domain position to a high frequency domain position, or a predefined PRB grid D1 in which the boundary B1 or B2 is offset from a high frequency domain position to a low frequency domain position, or 1 bit is used to indicate the direction of the offset.

[0171] The value of the above indication information I0 may also have other meanings, which are not limited.

[0172] It can be seen that in this scheme, the candidate subcarrier interval of RMSI is two, and the indication information I0 includes 1 bit of information, which can be used to indicate the relative position between PRB grid D1 and PRB grid D2. The relative position can be a frequency domain offset or a preset boundary of PRB grid D1 on PRB grid D2.

[0173] Solution 4: Jointly indicate the RMSI subcarrier spacing and the RMSI PRB grid.

[0174] During the initial access process, RMSI is used for the terminal to access the carrier. At this time, the subcarrier spacing of RMSI is supported by all terminals. In the frequency band below 6GHz, the subcarrier spacing of 60kHz may not be suitable for all terminals, and the candidate subcarrier spacing of RMSI is only 15kHz or 30kHz. At this time, a 2-bit indication information I0 can be sent on the PBCH to indicate the subcarrier spacing of RMSI and the PRB grid of RMSI.

[0175] When the subcarrier spacing S1 of the SS is 15kHz, the subcarrier spacing of the RMSI is S2, and the meanings of the various values ​​of the indication information I0 can be shown in the following Table 3:

[0176] Table 3

[0177] <![CDATA[I0]]> S2 00 15kHz 01 30kHz and grid boundary is candidate position 1 10 30kHz and grid boundary is candidate position 2 11 Reserved

[0178] The candidate positions in the table can be Fig.25 (1) shows the positions 0 and 1 respectively. Candidate position 1 can be position 0, and candidate position 2 can be position 1; or vice versa.

[0179] The above positions can also be expressed by frequency domain offset, as shown in Table 4 below:

[0180] Table 4

[0181] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S1) 01 30kHz, offset 0 PRB (subcarrier spacing is S1) 10 30kHz, offset by 1 PRB (subcarrier spacing is S1) 11 Reserved

[0182] Or as shown in Table 5 below:

[0183] Table 5

[0184] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S2) 01 30kHz, offset 0 PRB (subcarrier spacing is S2) 10 30kHz, offset by 1 / 2 PRB (subcarrier spacing is S2) 11 Reserved

[0185] When the subcarrier spacing S1 of SS is 30kHz, the subcarrier spacing of RMSI is S2. When the subcarrier spacing S2 of RMSI is smaller than the subcarrier spacing S1 of SS, Fig.11 The nested relationship shown is used to obtain the PRB grid of RMSI. At this time, the indication information I0 can be used only to indicate the subcarrier spacing, and the meanings of the various values ​​of the indication information I0 can be shown in the following Table 6:

[0186] Table 6

[0187] <![CDATA[I0]]> S2 00 15kHz 01 30kHz 10 Reserved 11 Reserved

[0188] The above positions can be represented by frequency domain offsets, as shown in Table 7 or Table 8 below: Since the number of PRBs offset at this time is 0, the indication information I0 can only be used to indicate the subcarrier spacing.

[0189] Table 7

[0190] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S1) 01 30kHz, offset 0 PRB (subcarrier spacing is S1) 10 Reserved 11 Reserved

[0191] Table 8

[0192] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S2) 01 30kHz, offset 0 PRB (subcarrier spacing is S2) 10 Reserved 11 Reserved

[0193] The offset in the table is the offset of the boundary B1 or B2 in the PRB grid D1 to the RPB grid D2. The frequency domain offset direction can be predefined to offset from the low-frequency domain position to the high-frequency domain position or predefined to offset from the high-frequency domain position to the low-frequency domain position, or use 1 bit to indicate the direction of the offset. The unit of the offset can also be the number of subcarriers, and one PRB corresponds to 12 subcarriers.

[0194] It can be seen that in this scheme, the candidate subcarrier spacing of RMSI is two, and the indication information I0 includes 2 bits of information, which can be used to indicate the subcarrier spacing of RMSI, or to indicate the subcarrier spacing of RMSI and the relative position between PRB grid D1 and PRB grid D2. The relative position can be a frequency domain offset or a preset boundary of PRB grid D1 on PRB grid D2.

[0195] Solution 5: Jointly indicate the RMSI subcarrier spacing and the RMSI PRB grid.

[0196] The difference from scheme 4 is that the candidate subcarrier spacing of RMSI is not limited. At this time, the indication information I0 includes 3 bits of information, which are used to indicate the subcarrier spacing of RMSI and the relative position between PRB grid D1 and PRB grid D2, and the relative position can be a frequency domain offset or a preset boundary of PRB grid D1 on PRB grid D2.

[0197] For different SS subcarrier spacing S1, the interpretation of the value of indication information I0 is different. When S1 is 15kHz, the meaning of indication information I0 is shown in Table 9 below:

[0198] Table 9

[0199] <![CDATA[I0]]> S2 000 15kHz 001 30kHz and the grid boundary is candidate position 0 010 30kHz and grid boundary is candidate position 1 011 60kHz and grid boundary is candidate position 0 100 60kHz and grid boundary is candidate position 1 101 60kHz and grid boundary is candidate position 2 110 60kHz and grid boundary is candidate position 3 111 Reserved

[0200] The candidate positions for S2 of 30kHz in the table can be as follows Fig.25 (1), they are position 0 and position 1 respectively. Candidate position 0 can be position 0, and candidate position 1 can be position 1; or vice versa. And the candidate position of S2 of 60kHz in the table can be as follows Fig.26 As shown, they are positions 0-3 respectively. 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 can also be represented in other forms. Fig.26 Positions 0-3 in the present application are not limited.

[0201] The above positions can be represented by frequency domain offsets, for example, as shown in Table 10 or Table 11 below:

[0202] Table 10

[0203]

[0204]

[0205] Table 11

[0206] <![CDATA[I0]]> S2 000 15kHz, offset 0 PRB (subcarrier spacing is S2) 001 30kHz, offset 0 PRB (subcarrier spacing is S2) 010 30kHz, offset by 1 / 2 PRB (subcarrier spacing is S2) 011 60kHz, offset 0 PRB (subcarrier spacing is S2) 100 60kHz, offset by 1 / 4 PRB (subcarrier spacing is S2) 101 60kHz, offset by 1 / 2 PRB (subcarrier spacing is S2) 110 60kHz, offset 3 / 4 PRB (subcarrier spacing is S2) 111 Reserved

[0207] When S1 is 30kHz, the meaning of the indication information I0 is shown in Table 12 below:

[0208] Table 12

[0209] <![CDATA[I0]]> S2 000 15kHz 001 30kHz 010 60kHz and grid boundary is candidate position 1 011 60kHz and grid boundary is candidate position 2 100 Reserved 101 Reserved 110 Reserved 111 Reserved

[0210] The candidate positions for S2 of 60kHz in the table can be as follows Fig.25 (2) shows the positions 0 and 1 respectively. Candidate position 1 can be position 0, and candidate position 2 can be position 1; or vice versa.

[0211] The above positions can be represented by frequency domain offsets, for example, as shown in Table 13 or 14 below:

[0212] Table 13

[0213] <![CDATA[I0]]> S2 000 15kHz, offset 0 PRB (subcarrier spacing is S1) 001 30kHz, offset 0 PRB (subcarrier spacing is S1) 010 60kHz, offset 0 PRB (subcarrier spacing is S1) 011 60kHz, offset by 1 PRB (subcarrier spacing is S1) 100 Reserved 101 Reserved 110 Reserved 111 Reserved

[0214] Table 14

[0215] <![CDATA[I0]]> S2 000 15kHz, offset 0 PRB (subcarrier spacing is S2) 001 30kHz, offset 0 PRB (subcarrier spacing is S2) 010 60kHz, offset 0 PRB (subcarrier spacing is S2) 011 60kHz, offset by 1 / 2 PRB (subcarrier spacing is S2) 100 Reserved 101 Reserved 110 Reserved 111 Reserved

[0216] The offset in the table is the offset of the boundary B1 or B2 in the PRB grid D1 to the RPB grid D2. The frequency domain offset direction can be predefined to offset from the low frequency domain position to the high frequency domain position or predefined to offset from the high frequency domain position to the low frequency domain position, or use 1 bit to indicate the direction of the offset. The unit of the offset can also be the number of subcarriers, and one PRB corresponds to 12 subcarriers.

[0217] Solution 6: Limit the subcarrier spacing of RMSI, do not add extra bits, and reuse the RMSI indication information to indicate the PRB grid of RMSI.

[0218] The indication information of RMSI is used to indicate the subcarrier spacing of RMSI. The set of subcarrier spacings supported by different carrier frequency bands is limited. For example, on carrier frequency bands below 6 GHz, {15, 30, 60} kHz is supported, and on carrier frequency bands above 6 GHz, {120, 240} kHz is supported. Therefore, when the network device indicates the subcarrier spacing S2 of RMSI to the terminal device, using 2 bits of information can meet the requirements. This scheme limits the candidate set of subcarrier spacing S2 and notifies the terminal data of the PRB grid D2 corresponding to the subcarrier spacing S2 without increasing the number of bits.

[0219] When the subcarrier spacing S1 of the SS is 15kHz, the candidate subcarrier spacing set of S2 is limited to {15, 30}kHz, then the network device sends indication information I0 to the terminal in the PBCH, and the terminal determines the PRB grid D2 corresponding to the subcarrier spacing S2 according to the PRB grid D1 corresponding to the subcarrier spacing S1 and the indication information I0. The specific bit information of the indication information I0 is shown in the following Table 15:

[0220] Table 15

[0221] <![CDATA[I0]]> S2 00 15kHz 01 30kHz and grid boundary is candidate position 1 10 30kHz and grid boundary is candidate position 2 11 Reserved

[0222] The candidate positions for S2 of 30kHz in the table can be as follows Fig.25 (1) shows the positions 0 and 1 respectively. Candidate position 1 can be position 0, and candidate position 2 can be position 1; or vice versa.

[0223] The above positions can be represented by frequency domain offsets, for example, as shown in Table 16 or 17 below:

[0224] Table 16

[0225] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S1) 01 30kHz, offset 0 PRB (subcarrier spacing is S1) 10 30kHz, offset by 1 PRB (subcarrier spacing is S1) 11 Reserved

[0226] Table 17

[0227] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S2) 01 30kHz, offset 0 PRB (subcarrier spacing is S2) 10 30kHz, offset by 1 / 2 PRB (subcarrier spacing is S2) 11 Reserved

[0228] When the subcarrier spacing S1 of the SS block is 30kHz, the specific bit information of the indication information I0 is shown in Table 18 below:

[0229] Table 18

[0230] <![CDATA[I0]]> S2 00 15kHz 01 30kHz 10 60kHz and grid boundary is candidate position 1 11 60kHz and grid boundary is candidate position 2

[0231] The candidate positions for S2 of 60kHz in the table can be as follows Fig.25 (2) shows the positions 0 and 1 respectively. Candidate position 1 can be position 0, and candidate position 2 can be position 1; or vice versa.

[0232] The above positions can be expressed as frequency domain offsets, as shown in Table 19 or 20 below:

[0233] Table 19

[0234] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S1) 01 30kHz, offset 0 PRB (subcarrier spacing is S1) 10 60kHz, offset 0 PRB (subcarrier spacing is S1) 11 60kHz, offset by 1 PRB (subcarrier spacing is S1)

[0235] Table 20

[0236] <![CDATA[I0]]> S2 00 15kHz, offset 0 PRB (subcarrier spacing is S2) 01 30kHz, offset 0 PRB (subcarrier spacing is S2) 10 60kHz, offset 0 PRB (subcarrier spacing is S2) 11 60kHz, offset by 1 / 2 PRB (subcarrier spacing is S2)

[0237] The offset in the table is the offset of the boundary B1 or B2 in the PRB grid D1 (corresponding to the subcarrier spacing S1) to the RPB grid D2 (corresponding to the subcarrier spacing S2). The frequency domain offset direction can be predefined to offset from the low-frequency domain position to the high-frequency domain position or predefined to offset from the high-frequency domain position to the low-frequency domain position, or use 1 bit to indicate the direction of the offset. The unit of the offset can also be the number of subcarriers, and one PRB corresponds to 12 subcarriers.

[0238] 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.

[0239] After the terminal receives the RMSI, the network device may send indication information in the RMSI or in high-level signaling, such as an RRC message, to indicate the PRB grid corresponding to the maximum subcarrier spacing S3 supported in at least one carrier frequency band, and the subcarrier spacing may be the subcarrier spacing used to send data and / or control information. For example, in a frequency band below 6 GHz, a 60 kHz PRB grid is indicated; in a frequency band above 6 GHz, no indication is required, because in a frequency band above 6 GHz, the candidate subcarrier spacing of the SS is {120, 240} kHz, the candidate subcarrier spacing set 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.

[0240] The indication information indicates the frequency domain offset between the PRB grid corresponding to the subcarrier spacing S3 and the known PRB grid. The known PRB grid may be the PRB grid corresponding to the subcarrier spacing S1. The subcarrier spacing S1 may be the subcarrier spacing of SS or the subcarrier spacing used for data and / or control information transmission that is the same as the SS subcarrier spacing; or the known PRB grid may be the PRB grid corresponding to the subcarrier spacing of RMSI, or the PRB grid corresponding to other known subcarrier spacings. The known means that the network device and the terminal have a consistent understanding.

[0241] Optionally, the indication information may include 2-bit information bits, that is, 2-bit information bits may be used to indicate the PRB grid corresponding to the maximum subcarrier spacing supported by the carrier frequency band. For example, the predefined known PRB grid is the RPB grid with the same subcarrier spacing as the SS subcarrier spacing for data transmission. If the SS subcarrier spacing is 15kHz, 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 PRB 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 that the frequency domain offset is 3 PRBs or 36 subcarriers. The subcarrier spacing corresponding to this PRB or subcarrier is the subcarrier spacing of SS.

[0242] If the subcarrier spacing of SS is 30kHz, then "00" indicates that the frequency domain offset is 0, "01" indicates that the frequency domain offset is half a PRB or 6 subcarriers, and the subcarrier spacing corresponding to this 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 offset is 1 PRB or 12 subcarriers, and the subcarrier spacing corresponding to this PRB or subcarrier is the same as the subcarrier spacing of SS.

[0243] The frequency domain offset direction can be a preset boundary position in the PRB grid corresponding to the predefined subcarrier spacing S1 offset from the low frequency domain position to the high frequency domain position, or a preset boundary position in the PRB grid corresponding to the predefined subcarrier spacing S1 offset from the high frequency domain position to the low frequency domain position, or use 1 bit to indicate the direction of the offset.

[0244] In the above scheme, the subcarrier spacing of the SS is the subcarrier spacing of the SS block.

[0245] Optionally, the preset boundary in the above scheme may be the boundary where the PRB grid of data and / or control corresponding to the SS block subcarrier spacing is aligned after the SS block center frequency is offset by a certain number of subcarriers to the low frequency domain position or the high frequency domain position, such as Fig.25 B1 and Fig.26 B2 in.

[0246] Please refer to Fig.15 , which is a schematic diagram of a terminal initially accessing a network provided by an embodiment of the present application. Fig.15 As shown, the process of initial terminal access to the network includes the following steps:

[0247] S151: The network device sends an SS block, which includes an SS and a PBCH. That is, the network device sends an SS and broadcasts information on the PBCH.

[0248] 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, the 24 PRBs centered on the center frequency of the SS are the frequency domain position of the PBCH, and the PRBs correspond to the subcarrier spacing of the SS. In this way, the terminal can receive information on the PBCH at the frequency domain position of the PBCH.

[0249] S154: The network device sends RMSI.

[0250] S155: The terminal receives RMSI, wherein the information on the PBCH includes information on the frequency domain position of the scheduling information of the RMSI. The terminal can determine the frequency domain position of the scheduling information of the RMSI according to the information on the PBCH, and then receive the scheduling information of the RMSI according to the frequency domain position. The scheduling information of the RMSI is used to indicate the frequency domain position of the RMSI, and the terminal receives the RMSI according to the scheduling information of the RMSI.

[0251] 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, which is used to indicate the frequency domain position of the CORESET. For example, the resource information includes CORESET offset indication information and the size of the CORESET. The CORESET offset indication information is used to indicate the frequency domain offset of the CORESET relative to a reference point, and the reference point may be the lowest, center, or highest frequency domain position of the SS (or SSblock), and the CORESET offset value is the frequency domain offset value of the lowest, center, or highest frequency domain position of the CORESET relative to the reference point. The CORESET is used for the terminal to blindly detect control information, for example, information carried on a physical downlink control channel (PDCCH), and the PDCCH includes a common search space, which is used to carry common information, for example, scheduling information including RMSI. The terminal obtains the position of the CORESET, and then detects the downlink control information according to the position of the CORESET, and obtains the scheduling information of the RMSI; the resource position where the RMSI is located is known according to the scheduling information of the RMSI, and then receives the RMSI. RMSI includes random access resource information. After receiving RMSI, the terminal can start the random access process (S156).

[0252] In the above process, if the frequency domain position information of the RMSI scheduling information in the PBCH is the number of offset PRBs, and the subcarrier spacing corresponding to the PRB is the subcarrier spacing of the SS, then the lowest frequency domain position of the CORESET can be implicitly obtained in this way, which is aligned with the PRB grid boundary corresponding to the CORESET.

[0253] For example, during the initial access process, the subcarrier spacing of RMSI is 30kHz, and the subcarrier spacing of SS is 15kHz. When indicating the frequency domain position of CORESET, the granularity of 15kHz PRB is used to indicate that the offset value between the center frequency position of CORESET and the center frequency position of SS is 7 PRBs, and the size of CORESET is 10 PRBs. Then the terminal can assume that the lowest frequency domain position of the 10 PRBs of CORESET is aligned with the 30kHz PRB grid boundary.

[0254] The concept of wideband carrier (wider BW CC, also known as wideband CC) is introduced in the NR communication system. A wideband carrier is a carrier whose carrier bandwidth (bandwidth, BW) is greater than or equal to the preset bandwidth, and the preset bandwidth is, for example, 100 MHz. A wideband carrier can allow different terminals to access the carrier through different SSs (or SS blocks). Here, different SSs refer to the differences in frequency domain positions, that is, SSs sent at different frequency domain positions. That is to say, on a broadband carrier, a 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 access the carrier through SSs in different SS blocks. At this time, there will be a situation where the PRB grids of different terminals are not aligned when determining the resources of the PBCH.

[0255] Please refer to Fig.16 , which is a schematic diagram of transmitting different SSs on a broadband carrier provided by an embodiment of the present application. Assuming that the first SS is sent at position 161 and the second SS is sent at position 162, position 162 is not aligned with the boundary of the PRB grid. Therefore, for the terminal that detects the SS at position 162, its understanding of the PRB grid is inconsistent with the understanding of the PRB grid by the terminal that detects the SS at position 161. In this way, it cannot be guaranteed that all terminals that access the carrier through different SSs can access the carrier. For example, the terminal that detects the SS at position 162 cannot accurately determine the resource location of the PBCH, and thus cannot access the carrier. The following is an example of a carrier that detects a SS at position 162. Fig.17 The situation shown is used as an example for explanation.

[0256] Fig.17 A schematic diagram of different terminals accessing the same carrier through different SSs provided in an embodiment of the present application. Fig.17In the figure, the size of the SS grid is 100kHz and the subcarrier spacing of the PRB is 15kHz. The network device sends the first SS at position 171 of the SS grid in the figure, and sends the second SS at position 172 of the SS grid in the figure. Terminal 173 and terminal 174 detect the SS according to the SS grid, and terminal 173 detects the first SS at position 171 of the SS grid, and determines the PRB grid according to the center frequency of the first SS, and then determines the resource location of the PBCH; terminal 174 detects the second SS at position 172 of the SS grid, and determines the PRB grid according to the center frequency of the second SS, and then determines the resource location of the PBCH. However, if the PRB grid determined by position 171 of the SS grid is used as a reference, then for terminal 174, there will be a situation where the PRB grid is not aligned. As shown in FIG. Fig.17 As shown, the PRB grid boundaries determined by terminal 173 and terminal 174 are not aligned, which shows that terminal 173 and terminal 174 have different understandings of the PRB grid. Therefore, there must be a terminal and a network device that have different understandings of the PRB grid, for example, the terminal is terminal 174, then terminal 174 cannot correctly determine the resource location of the PBCH, and thus cannot correctly receive the MIB, so that it cannot access the carrier.

[0257] In view of the above problems, the embodiment of the present application proposes a communication method, so that the frequency offset between the center frequencies of different SSs is a positive integer multiple of the least common multiple of the SS grid size and the PRB size, so that when the terminals using different SSs to access the same carrier determine 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. The following is described in conjunction with the accompanying drawings.

[0258] Please refer to Fig.18 , which is a schematic diagram of a communication method provided by an embodiment of the present application. The method is used to solve the problem that different terminals cannot access the carrier due to inconsistent understanding of the PRB grid when different terminals access the carrier through different SSs on the same carrier. Fig.18 As shown, the method includes:

[0259] S181: The network device sends a first SS on a carrier, wherein the center frequency of the first SS is located at a first position of the SS grid.

[0260] S182: When there is a second SS to be sent, the network device sends the second SS on the carrier, wherein the center frequency of the second SS is located at a second position of the SS grid.

[0261] The network device uses the same subcarrier spacing when sending SS on the same carrier, that is, the same subcarrier spacing is used to send the first SS and the second SS. And the frequency offset between the second position and the first position 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 product of the subcarrier spacing used to send the first SS and the second SS (hereinafter collectively referred to as the subcarrier spacing of the SS) and the number of subcarriers included in the PRB. That is to say, when there is a second SS to be sent, the network device does not send the second SS directly at the position of the next SS grid, or does not randomly select the position of an SS grid to send the second SS, but sends the second SS at the second position where the frequency offset between the first position meets 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 position and the first position is a positive integer multiple of the least common multiple of the SS grid size and the PRB size, where the PRB size is related to the subcarrier spacing.

[0262] S183: The terminal detects SS according to the SS grid.

[0263] When the SS is detected, the terminal obtains downlink synchronization with the cell according to the SS, and then obtains system information (S184); and then initiates random access according to the system information, thereby starting the random access process (S185).

[0264] In the above step S181, the network device sends a first SS block, which includes a first SS and a first PBCH, wherein the first SS includes a PSS and an SSS, that is, the network device sends the first SS and broadcasts information on the first PBCH. In the frequency domain, the center frequency of the first SS and the center frequency of the first PBCH are located at the first position of the SS grid. In the time domain, the network device can periodically send the first SS at the first position and broadcast information on the first PBCH.

[0265] In the above step S182, the network device sends a second SS block, which includes a second SS and a second PBCH, wherein the second SS includes a PSS and a SSS, that is, the network device sends the second SS and broadcasts information on the second PBCH. The PSS / SSS of the first SS and the PSS / SSS of the second SS can 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 send the second SS at the second position and broadcast information on the second PBCH.

[0266] When there can be multiple SSs on a carrier for terminals to access the carrier, in order to align the PRB grids determined by different terminals according to different SSs, that is, to have the same understanding of the PRB grids, in the above embodiment, the frequency offset between the center frequencies of different SSs (that is, the frequency offset between the second position and the first position) is limited to a positive integer multiple of the least common multiple of the SS grid size and the PRB size. The following is an example description taking different SS grid sizes and subcarrier spacing sizes as examples.

[0267] Please refer to Fig.19 , which is a schematic diagram of different terminals accessing the same carrier through different SSs provided in an embodiment of the present application. Assuming that the size of the SS grid is 100kHz and the subcarrier spacing of the SS is 15kHz, the size of the PRB is 15*12kHz, that is, 180kHz. The least common multiple of 100 and 180 is 900, so the frequency offset between the center frequencies of different SSs in a carrier (or the positions of the SS grids) is 900*n kHz, where n is a positive integer. At this time, the terminal 193 that detects the SS from the first position 191 of the SS grid and the terminal 194 that detects the SS from the second position 192 of the SS grid have the same understanding of the PRB grid, so both terminal 93 and terminal 194 can correctly receive the MIB and then access the carrier.

[0268] Assuming that the size of the SS grid is 100kHz and the subcarrier spacing of the SS is 30kHz, the size of the PRB is 30*12kHz, that is, 360kHz. The least common multiple of 100 and 180 is 1800, so the frequency offset between the center frequencies of different SSs in a carrier (or the positions of the SS grid) is 1800*n kHz, where n is a positive integer.

[0269] Assuming that the size of the SS grid is 180kHz and the subcarrier spacing of the SS is 15kHz, the size of the PRB is 15*12kHz, that is, 180kHz. Then the frequency offset between the center frequencies of different SSs in a carrier (or the positions of the SS grid) is 180*n kHz, where n is a positive integer. At this time, the size of the PRB is consistent with the size of the SS grid, so the lowest common multiple is 180kHz. 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 send SS at any two SS grid positions. When the size of the SS grid is 180kHz, assuming that the subcarrier spacing of the SS is 30kHz, the size of the PRB is 30*12kHz, that is, 360kHz. The lowest common multiple of 180 and 360 is 360, so the frequency offset between the center frequencies of different SSs in a carrier (or the positions of the SS grid) is 360*n kHz, where n is a positive integer.

[0270] Assuming that the size of the SS grid is 720kHz and the subcarrier spacing of the SS is 120kHz, the size of the PRB is 120*12kHz, that is, 1440kHz. The least common multiple of 720 and 1440 is 1440, so the frequency offset between the center frequencies of different SSs in one carrier (or the positions of the SS grid) is 1440*n kHz, where n is a positive integer. When the size of the SS grid is 720kHz, assuming that the subcarrier spacing of the SS is 240kHz, the size of the PRB is 240*12kHz, that is, 2880kHz. The least common multiple of 720 and 2880 is 2880, so the frequency offset between the center frequencies of different SSs in one carrier (or the positions of the SS grid) is 2880*n kHz, where n is a positive integer.

[0271] Several examples of SS grid sizes and subcarrier spacing sizes are given above, and the conditions satisfied by the frequency offsets between the center frequencies of different SSs under the corresponding sizes are described. These examples are only for the convenience of understanding this embodiment and are not intended to limit this application. Those skilled in the art can implement SS transmission of various SS grid and subcarrier spacing combinations according to the above embodiments.

[0272] In the above step S183, some terminals can detect SS at the first position, and some terminals can detect SS at the second position. Let the terminal that detects SS at the first position be the first terminal, and there can be one or more first terminals; let the terminal that detects SS at the second position be the second terminal, and there can be one or more second terminals.

[0273] In the above step S184, the system information acquired by the terminal may include MIB and RMSI. When the terminal is a first terminal, the first terminal detects the first SS at the first position of the SS grid, and determines the resource position of the first PBCH according to the first SS, for example, 24 PRBs centered on the center frequency of the first SS. Then, the first MIB sent by the network device is received on the first PBCH. When the terminal is a second terminal, the second terminal detects the second SS at the second position of the SS grid, and determines the resource position of the second PBCH according to the second SS, for example, 24 PRBs centered on the center frequency of the second SS. Then, the second MIB sent by the network device is received on the second PBCH.

[0274] Any of the above MIBs may include resource information, which 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, it receives the RMSI scheduling information sent by the network device according to the resource information in the MIB, and then receives the RMSI according to the RMSI scheduling information, and initiates random access according to the RMSI to access the carrier.

[0275] In one implementation, the PBCH carries 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, used to indicate the frequency domain position of the CORESET. Optionally, the resource information includes a CORESET offset value and the size of the CORESET. The CORESET offset value is used to indicate the frequency offset of the CORESET relative to a reference point, and the reference point may be the lowest, center, or highest frequency domain position of the SS (or SS block), and the CORESET offset value is the frequency offset of the lowest, center, or highest frequency domain position of the CORESET relative to the reference point. The CORESET is used for the terminal to blindly detect control information, for example, information carried on a physical downlink control channel (PDCCH), and the PDCCH includes a common search space, which is used to carry common information, for example, scheduling information including RMSI. The terminal obtains the position of the CORESET according to the MIB, and then detects the downlink control information according to the position of the CORESET, and obtains the scheduling information of the RMSI; the resource position where the RMSI is located is known according to the scheduling information of the RMSI, and then receives the RMSI. After receiving the RMSI, the terminal can start the random access process.

[0276] For example, the first terminal determines the resource location of the control channel where the first RMSI scheduling information is located based on the first resource information in the first MIB. 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 based on the first RMSI scheduling information, and the first RMSI is received at the determined resource location. Similarly, the second terminal determines the resource location of the control channel where the second RMSI scheduling information is located based on the second resource information in the second MIB. 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 based on the second RMSI scheduling information, and the second RMSI is received at the determined resource location.

[0277] It can be seen that when the terminal accesses the carrier, it first blindly detects the SS, determines the frequency domain position of the PBCH based on the detected SS, and then receives the MIB carried on the PBCH at the determined frequency domain position. The MIB includes information about the CORESET used to transmit downlink control information. The terminal determines the frequency domain position of the CORESET based on the information, and then receives the control information carried on the PDCCH at the determined frequency domain position. The control information includes the scheduling information of the RMSI. The terminal determines the frequency domain position of the RMSI on the physical downlink shared channel (PDSCH) based on the scheduling information of the RMSI. Then, the terminal can receive the RMSI at the determined frequency domain position. The RMSI can carry random access information, and the terminal can then initiate random access based on the RMSI.

[0278] 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; in other words, the size of the SS grid and the subcarrier spacing of the SS determine the frequency offset between the positions of the SS grids that send different SSs. In another implementation provided in an 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 a positive integer multiple of the size of the PRB corresponding to the subcarrier spacing of the SS. In this way, no matter at which SS grid position different SSs are sent, the terminal that detects the different SSs has a consistent understanding of the PRB grid, so that the above frequency domain position restriction method can be omitted, so that terminals accessing the same carrier through different SSs can correctly receive system information and access the carrier.

[0279] 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 due to inconsistent understanding of the PRB grid by different terminals on the same carrier when the terminals access the carrier through different SSs. Fig. 20 As shown, the method includes:

[0280] S201: The network device determines the size of the SS grid and the subcarrier spacing of the SS according to the frequency of the carrier;

[0281] S202: The network device sends the SS on the carrier using the determined subcarrier spacing, wherein the center frequency of the SS is located at a position of the SS grid, and the distance between two adjacent positions of the SS grid is the determined size of the SS grid.

[0282] Accordingly, 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 due to inconsistent understanding of the PRB grid by different terminals on the same carrier when the terminals access the carrier through different SSs. Fig.21 As shown, the method includes:

[0283] S211: The terminal determines the size of the SS grid and the subcarrier spacing of the SS according to the frequency of the carrier, wherein the size of the SS grid is a positive integer multiple of the PRB size, and the PRB size is the product of the subcarrier spacing of the SS and the number of subcarriers included in the PRB;

[0284] S212: The terminal detects the SS on the carrier according to the SS grid using the subcarrier spacing of the SS, wherein the distance between two adjacent positions of the SS grid is the determined size of the SS grid, and the center frequency of the SS is located at a position of the SS grid.

[0285] 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, the following Table 2 gives the subcarrier spacing of the SS and the size of the SS grid under several carrier frequencies, so that no matter which SS grid position different SSs are sent at, the terminals that detect the different SSs have the same understanding of the PRB grid, so that the above frequency domain position restriction method can be omitted, so that terminals accessing the same carrier through different SSs can correctly receive system information and access the carrier.

[0286] Table 2

[0287] Carrier frequency f Subcarrier spacing of SS SS Grid f<3GHz 15kHz 180kHz 3GHz<f<6GHz 30kHz 360kHz

[0288] Fig.18 , Fig. 20 and Fig.21 The embodiment shown can be combined with the above embodiment, that is, when the carrier supports the transmission of different SSs, the above method can be used to make the terminals accessing the carrier through different SSs understand the PRB grid consistently. And through the method of the above embodiment, the terminal correctly obtains the PRB grid used for data / control information transmission, and then performs correct data / control information transmission and reception.

[0289] The embodiments of the present application also provide a device for implementing any of the above methods, for example, a device is provided including a unit (or means) for implementing each step performed by the terminal in any of the above methods. For another example, another device is provided, including a unit (or means) for implementing each step performed by the network device in any of the above methods.

[0290] It should be understood that the division of units in the device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. And the units in the device can all be implemented in the form of software calling through processing elements; they can also be all implemented in the form of hardware; some units can also be implemented in the form of software calling through processing elements, and some units can be implemented in the form of hardware. For example, the unit can be a separately established processing element, or it can be integrated in a certain chip of the device for implementation. In addition, it can also be stored in the memory in the form of a program, and called and executed by a certain processing element of the device. The implementation of other units is similar. In addition, these units can be fully or partially integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above units can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.

[0291] For example, the unit in the device may be one or more integrated circuits configured to implement the above method, such as one or more application specific integrated circuits (ASIC), or one or more digital singnal processors (DSP), or one or more field programmable gate arrays (FPGA), etc. For another example, when the unit in the device can be implemented in the form of a processing element scheduler, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0292] Please refer to Fig. 22 , which is a schematic diagram of the structure of a network device provided in an embodiment of the present application, and is used to implement the operation of the network device in the above embodiment. Fig. 22 As shown, 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 222. In the uplink direction, the radio frequency device 222 receives information sent by the terminal through the antenna 221, and sends the information sent 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, and the radio frequency device 222 processes the information of the terminal and sends it to the terminal through the antenna 221.

[0293] The above device for network equipment can be located in the baseband device 223. In one implementation, the unit for implementing each step in the above method by the network device can be implemented in the form of a processing element scheduling program. For example, the baseband device 223 includes a processing element 2231 and a storage element 2232. The processing element 2231 calls the program stored in the storage element 2232 to execute the method executed by the network device in the above method embodiment. In addition, the baseband device 223 can also include an interface 2233 for exchanging information with the radio frequency device 222. The interface is, for example, a common public radio interface (CPRI).

[0294] In another implementation, the unit of the network device implementing each step in the above method may be configured as one or more processing elements, which are arranged on the baseband device 223. The processing elements here may be integrated circuits, such as one or more ASICs, or one or more DSPs, or one or more FPGAs, etc. These integrated circuits may be integrated together to form a chip.

[0295] These units can be integrated together and implemented 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 chip can integrate a processing element 2231 and a storage element 2232, and the processing element 2231 calls the program stored in the storage element 2232 to implement the method executed by the above network device; or, the chip can integrate at least one integrated circuit to implement the method executed by the above network device; or, the above implementation methods can be combined, and the functions of some units are implemented in the form of a processing element calling a program, and the functions of some units are implemented in the form of an integrated circuit.

[0296] Regardless of the method adopted, in short, the above apparatus for network equipment includes at least one processing element and a storage element, wherein at least one processing element is used to execute the method performed by the network equipment provided in the above method embodiment. The processing element can execute part or all of the steps performed by the network equipment in the above method embodiment in a first manner: that is, by calling the program stored in the storage element; or in a second manner: that is, by combining the hardware integrated logic circuit in the processor element with the instruction to execute part or all of the steps performed by the network equipment in the above method embodiment; of course, the first manner and the second manner can also be combined to execute part or all of the steps performed by the network equipment in the above method embodiment.

[0297] The processing element here is the same as described above, and can be a general-purpose processor, such as a central processing unit (CPU), or it can be one or more integrated circuits configured to implement the above method, such as: one or more application specific integrated circuits (ASIC), or, one or more microprocessors (digital singnal processor, DSP), or, one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), etc.

[0298] A storage element may be a memory or a collective term for multiple storage elements.

[0299] Please refer to Fig.23 , which is a schematic diagram of the structure of a terminal provided in an embodiment of the present application. It can be the terminal in the above embodiment, used to implement the operation of the terminal in the above embodiment. Fig.23 As shown, 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 information sent by the network device through the antenna, and sends 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 it to the radio frequency device 231. The radio frequency device 231 processes the information of the terminal and sends it to the network device through the antenna.

[0300] The baseband device may include a modem subsystem for processing each communication protocol layer of the data. It may also include a central processing subsystem for processing the terminal operating system and the application layer. In addition, it may also include other subsystems, such as a multimedia subsystem, a peripheral subsystem, etc., wherein the multimedia subsystem is used to control the terminal camera, screen display, etc., and the peripheral subsystem is used to connect to other devices. The modem subsystem may be a separately set chip, and optionally, the above frequency domain resource processing device may be implemented on the modem subsystem.

[0301] In one implementation, the unit that implements each step in the above method in the terminal can be implemented in the form of a processing element scheduling program, for example, a subsystem of the baseband device 232, such as a modem subsystem, includes a processing element 2321 and a storage element 2322, and the processing element 2321 calls the program stored in the storage element 2322 to execute the method executed by the terminal in the above method embodiment. In addition, the baseband device 232 may also include an interface 2323 for exchanging information with the radio frequency device 231.

[0302] In another implementation, the unit that implements each step in the above method in the terminal may be configured as one or more processing elements, which are arranged on a subsystem of the baseband device 232, such as a modem subsystem, and the processing element here may be an integrated circuit, such as one or more ASICs, or one or more DSPs, or one or more FPGAs, etc. These integrated circuits may be integrated together to form a chip.

[0303] For example, the units for implementing the above method in the terminal can be integrated together 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 chip can integrate a processing element 2321 and a storage element 2322, and the processing element 2321 calls the program stored in the storage element 2322 to implement the above terminal execution method; or, the chip can integrate at least one integrated circuit to implement the above terminal execution method; or, the above implementation methods can be combined, and the functions of some units can be implemented in the form of a processing element calling a program, and the functions of some units can be implemented in the form of an integrated circuit.

[0304] Regardless of the method, in short, the above device for a terminal includes at least one processing element and a storage element, wherein at least one processing element is used to execute the method performed by the terminal provided in the above method embodiment. The processing element can execute part or all of the steps performed by the terminal in the above method embodiment in a first manner: that is, by scheduling the program stored in the storage element; or in a second manner: that is, by combining the hardware integrated logic circuit in the processor element with instructions to execute part or all of the steps performed by the terminal in the above method embodiment; of course, the first manner and the second manner can also be combined to execute part or all of the steps performed by the terminal in the above method embodiment.

[0305] The processing element here is the same as described above, and can be a general-purpose processor, such as a central processing unit (CPU), or it can be one or more integrated circuits configured to implement the above method, such as: one or more application specific integrated circuits (ASIC), or, one or more microprocessors (digital singnal processor, DSP), or, one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), etc.

[0306] A storage element may be a memory or a collective term for multiple storage elements.

[0307] A person of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, etc., various media that can store program codes.

Claims

1. A communication method, comprising: detecting a synchronization signal from a network device based on a synchronization signal grid; Determining a first resource location according to the synchronization signal; receiving first indication information from the network device, where the first indication information is used to indicate a first frequency offset between the first resource location and a second resource location; receiving third indication information from the network device, where the third indication information is used to indicate a second frequency offset between the second resource location and a third resource location; Communicating with the network device based on the third resource location.

2. The method according to claim 1, characterized in that: The synchronization signal grid is determined according to the frequency band.

3. The method according to claim 1 or 2, characterized in that: Receiving first indication information from the network device includes: The first indication information is received through a physical broadcast channel PBCH.

4. The method according to claim 1 or 2, characterized in that: Receiving the third indication information from the network device includes: receiving remaining minimum system information RMSI from the network device, where the RMSI carries the third indication information; or, A radio resource control RRC message is received from the network device, where the RRC message carries the third indication information.

5. The method according to claim 3, characterized in that: Receiving the third indication information from the network device includes: receiving remaining minimum system information RMSI from the network device, where the RMSI carries the third indication information; or, A radio resource control RRC message is received from the network device, where the RRC message carries the third indication information.

6. A communication method, comprising: Sending a synchronization signal to the terminal at a first resource location; Sending first indication information to the terminal, where the first indication information is used to indicate a first frequency offset between the first resource position and a second resource position; Sending third indication information to the terminal, where the third indication information is used to indicate a first frequency offset between the second resource position and a third resource position; Communicate with the terminal based on the third resource location.

7. The method according to claim 6, characterized in that Sending first indication information to the terminal includes: The first indication information is sent via a physical broadcast channel PBCH.

8. The method according to claim 6 or 7, characterized in that: Sending third indication information to the terminal includes: Sending remaining minimum system information RMSI to the terminal, where the RMSI carries the third indication information; or, A radio resource control (RRC) message is sent to the terminal, where the RRC message carries the third indication information.

9. A communication device, comprising a module for executing each step of any one of claims 1 to 8.

10. A communication device, comprising at least one processing element and at least one storage element, wherein the at least one storage element is used to store programs and data, and the at least one processing element is used to execute the method according to any one of claims 1 to 8.

11. A computer storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the program is used to implement the method according to any one of claims 1 to 8.

12. A computer program product comprising computer instructions, characterized in that: When the computer instructions are executed by a communication device, the method according to any one of claims 1 to 8 is implemented.

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